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| <span id="1003">1003</span> |
| <span id="1004">1004</span> |
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| <span id="1006">1006</span> |
| <span id="1007">1007</span> |
| <span id="1008">1008</span> |
| <span id="1009">1009</span> |
| <span id="1010">1010</span> |
| <span id="1011">1011</span> |
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| <span id="1020">1020</span> |
| <span id="1021">1021</span> |
| <span id="1022">1022</span> |
| <span id="1023">1023</span> |
| <span id="1024">1024</span> |
| <span id="1025">1025</span> |
| <span id="1026">1026</span> |
| <span id="1027">1027</span> |
| <span id="1028">1028</span> |
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| <span id="1030">1030</span> |
| <span id="1031">1031</span> |
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| <span id="1033">1033</span> |
| <span id="1034">1034</span> |
| <span id="1035">1035</span> |
| <span id="1036">1036</span> |
| <span id="1037">1037</span> |
| <span id="1038">1038</span> |
| <span id="1039">1039</span> |
| <span id="1040">1040</span> |
| <span id="1041">1041</span> |
| <span id="1042">1042</span> |
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| <span id="1045">1045</span> |
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| <span id="1049">1049</span> |
| <span id="1050">1050</span> |
| <span id="1051">1051</span> |
| <span id="1052">1052</span> |
| <span id="1053">1053</span> |
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| <span id="1567">1567</span> |
| <span id="1568">1568</span> |
| <span id="1569">1569</span> |
| <span id="1570">1570</span> |
| <span id="1571">1571</span> |
| <span id="1572">1572</span> |
| <span id="1573">1573</span> |
| <span id="1574">1574</span> |
| <span id="1575">1575</span> |
| <span id="1576">1576</span> |
| <span id="1577">1577</span> |
| <span id="1578">1578</span> |
| <span id="1579">1579</span> |
| <span id="1580">1580</span> |
| <span id="1581">1581</span> |
| <span id="1582">1582</span> |
| <span id="1583">1583</span> |
| <span id="1584">1584</span> |
| <span id="1585">1585</span> |
| <span id="1586">1586</span> |
| <span id="1587">1587</span> |
| <span id="1588">1588</span> |
| <span id="1589">1589</span> |
| <span id="1590">1590</span> |
| <span id="1591">1591</span> |
| <span id="1592">1592</span> |
| <span id="1593">1593</span> |
| <span id="1594">1594</span> |
| <span id="1595">1595</span> |
| <span id="1596">1596</span> |
| <span id="1597">1597</span> |
| <span id="1598">1598</span> |
| <span id="1599">1599</span> |
| <span id="1600">1600</span> |
| </pre><pre class="rust"><code><span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)]</span> |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::lookahead</span>; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)]</span> |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::parse</span>::{<span class="ident">Parse</span>, <span class="ident">Parser</span>}; |
| <span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">Error</span>, <span class="prelude-ty">Result</span>}; |
| <span class="kw">use</span> <span class="ident">proc_macro2</span>::{<span class="ident">Ident</span>, <span class="ident">Literal</span>, <span class="ident">Span</span>}; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)]</span> |
| <span class="kw">use</span> <span class="ident">proc_macro2</span>::{<span class="ident">TokenStream</span>, <span class="ident">TokenTree</span>}; |
| <span class="kw">use</span> <span class="ident">std::fmt</span>::{<span class="self">self</span>, <span class="ident">Display</span>}; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>)]</span> |
| <span class="kw">use</span> <span class="ident">std::hash</span>::{<span class="ident">Hash</span>, <span class="ident">Hasher</span>}; |
| <span class="kw">use</span> <span class="ident">std::str</span>::{<span class="self">self</span>, <span class="ident">FromStr</span>}; |
| |
| <span class="macro">ast_enum_of_structs!</span> { |
| <span class="doccomment">/// A Rust literal such as a string or integer or boolean.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Syntax tree enum</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This type is a [syntax tree enum].</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [syntax tree enum]: crate::Expr#syntax-tree-enums</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Lit</span> { |
| <span class="doccomment">/// A UTF-8 string literal: `"foo"`.</span> |
| <span class="ident">Str</span>(<span class="ident">LitStr</span>), |
| |
| <span class="doccomment">/// A byte string literal: `b"foo"`.</span> |
| <span class="ident">ByteStr</span>(<span class="ident">LitByteStr</span>), |
| |
| <span class="doccomment">/// A byte literal: `b'f'`.</span> |
| <span class="ident">Byte</span>(<span class="ident">LitByte</span>), |
| |
| <span class="doccomment">/// A character literal: `'a'`.</span> |
| <span class="ident">Char</span>(<span class="ident">LitChar</span>), |
| |
| <span class="doccomment">/// An integer literal: `1` or `1u16`.</span> |
| <span class="ident">Int</span>(<span class="ident">LitInt</span>), |
| |
| <span class="doccomment">/// A floating point literal: `1f64` or `1.0e10f64`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Must be finite. May not be infinite or NaN.</span> |
| <span class="ident">Float</span>(<span class="ident">LitFloat</span>), |
| |
| <span class="doccomment">/// A boolean literal: `true` or `false`.</span> |
| <span class="ident">Bool</span>(<span class="ident">LitBool</span>), |
| |
| <span class="doccomment">/// A raw token literal not interpreted by Syn.</span> |
| <span class="ident">Verbatim</span>(<span class="ident">Literal</span>), |
| } |
| } |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// A UTF-8 string literal: `"foo"`.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LitStr</span> { |
| <span class="ident">repr</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">LitRepr</span><span class="op">></span>, |
| } |
| } |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// A byte string literal: `b"foo"`.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LitByteStr</span> { |
| <span class="ident">repr</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">LitRepr</span><span class="op">></span>, |
| } |
| } |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// A byte literal: `b'f'`.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LitByte</span> { |
| <span class="ident">repr</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">LitRepr</span><span class="op">></span>, |
| } |
| } |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// A character literal: `'a'`.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LitChar</span> { |
| <span class="ident">repr</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">LitRepr</span><span class="op">></span>, |
| } |
| } |
| |
| <span class="kw">struct</span> <span class="ident">LitRepr</span> { |
| <span class="ident">token</span>: <span class="ident">Literal</span>, |
| <span class="ident">suffix</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, |
| } |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// An integer literal: `1` or `1u16`.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LitInt</span> { |
| <span class="ident">repr</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">LitIntRepr</span><span class="op">></span>, |
| } |
| } |
| |
| <span class="kw">struct</span> <span class="ident">LitIntRepr</span> { |
| <span class="ident">token</span>: <span class="ident">Literal</span>, |
| <span class="ident">digits</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, |
| <span class="ident">suffix</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, |
| } |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// A floating point literal: `1f64` or `1.0e10f64`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Must be finite. May not be infinite or NaN.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LitFloat</span> { |
| <span class="ident">repr</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">LitFloatRepr</span><span class="op">></span>, |
| } |
| } |
| |
| <span class="kw">struct</span> <span class="ident">LitFloatRepr</span> { |
| <span class="ident">token</span>: <span class="ident">Literal</span>, |
| <span class="ident">digits</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, |
| <span class="ident">suffix</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, |
| } |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// A boolean literal: `true` or `false`.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LitBool</span> { |
| <span class="kw">pub</span> <span class="ident">value</span>: <span class="ident">bool</span>, |
| <span class="kw">pub</span> <span class="ident">span</span>: <span class="ident">Span</span>, |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">LitStr</span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">value</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">span</span>: <span class="ident">Span</span>) -> <span class="self">Self</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">token</span> <span class="op">=</span> <span class="ident">Literal::string</span>(<span class="ident">value</span>); |
| <span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| <span class="ident">LitStr</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitRepr</span> { |
| <span class="ident">token</span>, |
| <span class="ident">suffix</span>: <span class="ident">Box</span>::<span class="op"><</span><span class="ident">str</span><span class="op">></span><span class="ident">::default</span>(), |
| }), |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">value</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">String</span> { |
| <span class="kw">let</span> <span class="ident">repr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">to_string</span>(); |
| <span class="kw">let</span> (<span class="ident">value</span>, <span class="ident">_suffix</span>) <span class="op">=</span> <span class="ident">value::parse_lit_str</span>(<span class="kw-2">&</span><span class="ident">repr</span>); |
| <span class="ident">String::from</span>(<span class="ident">value</span>) |
| } |
| |
| <span class="doccomment">/// Parse a syntax tree node from the content of this string literal.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// All spans in the syntax tree will point to the span of this `LitStr`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// use proc_macro2::Span;</span> |
| <span class="doccomment">/// use syn::{Attribute, Error, Ident, Lit, Meta, MetaNameValue, Path, Result};</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// // Parses the path from an attribute that looks like:</span> |
| <span class="doccomment">/// //</span> |
| <span class="doccomment">/// // #[path = "a::b::c"]</span> |
| <span class="doccomment">/// //</span> |
| <span class="doccomment">/// // or returns `None` if the input is some other attribute.</span> |
| <span class="doccomment">/// fn get_path(attr: &Attribute) -> Result<Option<Path>> {</span> |
| <span class="doccomment">/// if !attr.path.is_ident("path") {</span> |
| <span class="doccomment">/// return Ok(None);</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// match attr.parse_meta()? {</span> |
| <span class="doccomment">/// Meta::NameValue(MetaNameValue { lit: Lit::Str(lit_str), .. }) => {</span> |
| <span class="doccomment">/// lit_str.parse().map(Some)</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// _ => {</span> |
| <span class="doccomment">/// let message = "expected #[path = \"...\"]";</span> |
| <span class="doccomment">/// Err(Error::new_spanned(attr, message))</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Parse</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">parse_with</span>(<span class="ident">T::parse</span>) |
| } |
| |
| <span class="doccomment">/// Invoke parser on the content of this string literal.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// All spans in the syntax tree will point to the span of this `LitStr`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// # use proc_macro2::Span;</span> |
| <span class="doccomment">/// # use syn::{LitStr, Result};</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// # fn main() -> Result<()> {</span> |
| <span class="doccomment">/// # let lit_str = LitStr::new("a::b::c", Span::call_site());</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// # const IGNORE: &str = stringify! {</span> |
| <span class="doccomment">/// let lit_str: LitStr = /* ... */;</span> |
| <span class="doccomment">/// # };</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// // Parse a string literal like "a::b::c" into a Path, not allowing</span> |
| <span class="doccomment">/// // generic arguments on any of the path segments.</span> |
| <span class="doccomment">/// let basic_path = lit_str.parse_with(syn::Path::parse_mod_style)?;</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// # Ok(())</span> |
| <span class="doccomment">/// # }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_with</span><span class="op"><</span><span class="ident">F</span>: <span class="ident">Parser</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">parser</span>: <span class="ident">F</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">F::Output</span><span class="op">></span> { |
| <span class="kw">use</span> <span class="ident">proc_macro2::Group</span>; |
| |
| <span class="comment">// Token stream with every span replaced by the given one.</span> |
| <span class="kw">fn</span> <span class="ident">respan_token_stream</span>(<span class="ident">stream</span>: <span class="ident">TokenStream</span>, <span class="ident">span</span>: <span class="ident">Span</span>) -> <span class="ident">TokenStream</span> { |
| <span class="ident">stream</span> |
| .<span class="ident">into_iter</span>() |
| .<span class="ident">map</span>(<span class="op">|</span><span class="ident">token</span><span class="op">|</span> <span class="ident">respan_token_tree</span>(<span class="ident">token</span>, <span class="ident">span</span>)) |
| .<span class="ident">collect</span>() |
| } |
| |
| <span class="comment">// Token tree with every span replaced by the given one.</span> |
| <span class="kw">fn</span> <span class="ident">respan_token_tree</span>(<span class="kw-2">mut</span> <span class="ident">token</span>: <span class="ident">TokenTree</span>, <span class="ident">span</span>: <span class="ident">Span</span>) -> <span class="ident">TokenTree</span> { |
| <span class="kw">match</span> <span class="kw-2">&mut</span> <span class="ident">token</span> { |
| <span class="ident">TokenTree::Group</span>(<span class="ident">g</span>) => { |
| <span class="kw">let</span> <span class="ident">stream</span> <span class="op">=</span> <span class="ident">respan_token_stream</span>(<span class="ident">g</span>.<span class="ident">stream</span>(), <span class="ident">span</span>); |
| <span class="kw-2">*</span><span class="ident">g</span> <span class="op">=</span> <span class="ident">Group::new</span>(<span class="ident">g</span>.<span class="ident">delimiter</span>(), <span class="ident">stream</span>); |
| <span class="ident">g</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| } |
| <span class="ident">other</span> => <span class="ident">other</span>.<span class="ident">set_span</span>(<span class="ident">span</span>), |
| } |
| <span class="ident">token</span> |
| } |
| |
| <span class="comment">// Parse string literal into a token stream with every span equal to the</span> |
| <span class="comment">// original literal's span.</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tokens</span> <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::parse_str</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">value</span>())<span class="question-mark">?</span>; |
| <span class="ident">tokens</span> <span class="op">=</span> <span class="ident">respan_token_stream</span>(<span class="ident">tokens</span>, <span class="self">self</span>.<span class="ident">span</span>()); |
| |
| <span class="ident">parser</span>.<span class="ident">parse2</span>(<span class="ident">tokens</span>) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">span</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Span</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">span</span>() |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_span</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">span</span>: <span class="ident">Span</span>) { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">suffix</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="ident">str</span> { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">suffix</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">token</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Literal</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">clone</span>() |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">LitByteStr</span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">value</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>], <span class="ident">span</span>: <span class="ident">Span</span>) -> <span class="self">Self</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">token</span> <span class="op">=</span> <span class="ident">Literal::byte_string</span>(<span class="ident">value</span>); |
| <span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| <span class="ident">LitByteStr</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitRepr</span> { |
| <span class="ident">token</span>, |
| <span class="ident">suffix</span>: <span class="ident">Box</span>::<span class="op"><</span><span class="ident">str</span><span class="op">></span><span class="ident">::default</span>(), |
| }), |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">value</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">repr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">to_string</span>(); |
| <span class="kw">let</span> (<span class="ident">value</span>, <span class="ident">_suffix</span>) <span class="op">=</span> <span class="ident">value::parse_lit_byte_str</span>(<span class="kw-2">&</span><span class="ident">repr</span>); |
| <span class="ident">value</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">span</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Span</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">span</span>() |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_span</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">span</span>: <span class="ident">Span</span>) { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">suffix</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="ident">str</span> { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">suffix</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">token</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Literal</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">clone</span>() |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">LitByte</span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">value</span>: <span class="ident">u8</span>, <span class="ident">span</span>: <span class="ident">Span</span>) -> <span class="self">Self</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">token</span> <span class="op">=</span> <span class="ident">Literal::u8_suffixed</span>(<span class="ident">value</span>); |
| <span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| <span class="ident">LitByte</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitRepr</span> { |
| <span class="ident">token</span>, |
| <span class="ident">suffix</span>: <span class="ident">Box</span>::<span class="op"><</span><span class="ident">str</span><span class="op">></span><span class="ident">::default</span>(), |
| }), |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">value</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">u8</span> { |
| <span class="kw">let</span> <span class="ident">repr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">to_string</span>(); |
| <span class="kw">let</span> (<span class="ident">value</span>, <span class="ident">_suffix</span>) <span class="op">=</span> <span class="ident">value::parse_lit_byte</span>(<span class="kw-2">&</span><span class="ident">repr</span>); |
| <span class="ident">value</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">span</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Span</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">span</span>() |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_span</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">span</span>: <span class="ident">Span</span>) { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">suffix</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="ident">str</span> { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">suffix</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">token</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Literal</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">clone</span>() |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">LitChar</span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">value</span>: <span class="ident">char</span>, <span class="ident">span</span>: <span class="ident">Span</span>) -> <span class="self">Self</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">token</span> <span class="op">=</span> <span class="ident">Literal::character</span>(<span class="ident">value</span>); |
| <span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| <span class="ident">LitChar</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitRepr</span> { |
| <span class="ident">token</span>, |
| <span class="ident">suffix</span>: <span class="ident">Box</span>::<span class="op"><</span><span class="ident">str</span><span class="op">></span><span class="ident">::default</span>(), |
| }), |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">value</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">char</span> { |
| <span class="kw">let</span> <span class="ident">repr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">to_string</span>(); |
| <span class="kw">let</span> (<span class="ident">value</span>, <span class="ident">_suffix</span>) <span class="op">=</span> <span class="ident">value::parse_lit_char</span>(<span class="kw-2">&</span><span class="ident">repr</span>); |
| <span class="ident">value</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">span</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Span</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">span</span>() |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_span</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">span</span>: <span class="ident">Span</span>) { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">suffix</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="ident">str</span> { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">suffix</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">token</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Literal</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">clone</span>() |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">LitInt</span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">repr</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">span</span>: <span class="ident">Span</span>) -> <span class="self">Self</span> { |
| <span class="kw">let</span> (<span class="ident">digits</span>, <span class="ident">suffix</span>) <span class="op">=</span> <span class="kw">match</span> <span class="ident">value::parse_lit_int</span>(<span class="ident">repr</span>) { |
| <span class="prelude-val">Some</span>(<span class="ident">parse</span>) => <span class="ident">parse</span>, |
| <span class="prelude-val">None</span> => <span class="macro">panic!</span>(<span class="string">"Not an integer literal: `{}`"</span>, <span class="ident">repr</span>), |
| }; |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">token</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">value::to_literal</span>(<span class="ident">repr</span>, <span class="kw-2">&</span><span class="ident">digits</span>, <span class="kw-2">&</span><span class="ident">suffix</span>) { |
| <span class="prelude-val">Some</span>(<span class="ident">token</span>) => <span class="ident">token</span>, |
| <span class="prelude-val">None</span> => <span class="macro">panic!</span>(<span class="string">"Unsupported integer literal: `{}`"</span>, <span class="ident">repr</span>), |
| }; |
| |
| <span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| <span class="ident">LitInt</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitIntRepr</span> { |
| <span class="ident">token</span>, |
| <span class="ident">digits</span>, |
| <span class="ident">suffix</span>, |
| }), |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">base10_digits</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="ident">str</span> { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">digits</span> |
| } |
| |
| <span class="doccomment">/// Parses the literal into a selected number type.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is equivalent to `lit.base10_digits().parse()` except that the</span> |
| <span class="doccomment">/// resulting errors will be correctly spanned to point to the literal token</span> |
| <span class="doccomment">/// in the macro input.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// use syn::LitInt;</span> |
| <span class="doccomment">/// use syn::parse::{Parse, ParseStream, Result};</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// struct Port {</span> |
| <span class="doccomment">/// value: u16,</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// impl Parse for Port {</span> |
| <span class="doccomment">/// fn parse(input: ParseStream) -> Result<Self> {</span> |
| <span class="doccomment">/// let lit: LitInt = input.parse()?;</span> |
| <span class="doccomment">/// let value = lit.base10_parse::<u16>()?;</span> |
| <span class="doccomment">/// Ok(Port { value })</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">base10_parse</span><span class="op"><</span><span class="ident">N</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">N</span><span class="op">></span> |
| <span class="kw">where</span> |
| <span class="ident">N</span>: <span class="ident">FromStr</span>, |
| <span class="ident">N::Err</span>: <span class="ident">Display</span>, |
| { |
| <span class="self">self</span>.<span class="ident">base10_digits</span>() |
| .<span class="ident">parse</span>() |
| .<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="ident">Error::new</span>(<span class="self">self</span>.<span class="ident">span</span>(), <span class="ident">err</span>)) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">suffix</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="ident">str</span> { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">suffix</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">span</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Span</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">span</span>() |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_span</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">span</span>: <span class="ident">Span</span>) { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">token</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Literal</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">clone</span>() |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">Literal</span><span class="op">></span> <span class="kw">for</span> <span class="ident">LitInt</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">token</span>: <span class="ident">Literal</span>) -> <span class="self">Self</span> { |
| <span class="kw">let</span> <span class="ident">repr</span> <span class="op">=</span> <span class="ident">token</span>.<span class="ident">to_string</span>(); |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">digits</span>, <span class="ident">suffix</span>)) <span class="op">=</span> <span class="ident">value::parse_lit_int</span>(<span class="kw-2">&</span><span class="ident">repr</span>) { |
| <span class="ident">LitInt</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitIntRepr</span> { |
| <span class="ident">token</span>, |
| <span class="ident">digits</span>, |
| <span class="ident">suffix</span>, |
| }), |
| } |
| } <span class="kw">else</span> { |
| <span class="macro">panic!</span>(<span class="string">"Not an integer literal: `{}`"</span>, <span class="ident">repr</span>); |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">LitInt</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">fmt</span>(<span class="ident">formatter</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">LitFloat</span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">repr</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">span</span>: <span class="ident">Span</span>) -> <span class="self">Self</span> { |
| <span class="kw">let</span> (<span class="ident">digits</span>, <span class="ident">suffix</span>) <span class="op">=</span> <span class="kw">match</span> <span class="ident">value::parse_lit_float</span>(<span class="ident">repr</span>) { |
| <span class="prelude-val">Some</span>(<span class="ident">parse</span>) => <span class="ident">parse</span>, |
| <span class="prelude-val">None</span> => <span class="macro">panic!</span>(<span class="string">"Not a float literal: `{}`"</span>, <span class="ident">repr</span>), |
| }; |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">token</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">value::to_literal</span>(<span class="ident">repr</span>, <span class="kw-2">&</span><span class="ident">digits</span>, <span class="kw-2">&</span><span class="ident">suffix</span>) { |
| <span class="prelude-val">Some</span>(<span class="ident">token</span>) => <span class="ident">token</span>, |
| <span class="prelude-val">None</span> => <span class="macro">panic!</span>(<span class="string">"Unsupported float literal: `{}`"</span>, <span class="ident">repr</span>), |
| }; |
| |
| <span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| <span class="ident">LitFloat</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitFloatRepr</span> { |
| <span class="ident">token</span>, |
| <span class="ident">digits</span>, |
| <span class="ident">suffix</span>, |
| }), |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">base10_digits</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="ident">str</span> { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">digits</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">base10_parse</span><span class="op"><</span><span class="ident">N</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">N</span><span class="op">></span> |
| <span class="kw">where</span> |
| <span class="ident">N</span>: <span class="ident">FromStr</span>, |
| <span class="ident">N::Err</span>: <span class="ident">Display</span>, |
| { |
| <span class="self">self</span>.<span class="ident">base10_digits</span>() |
| .<span class="ident">parse</span>() |
| .<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="ident">Error::new</span>(<span class="self">self</span>.<span class="ident">span</span>(), <span class="ident">err</span>)) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">suffix</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="ident">str</span> { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">suffix</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">span</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Span</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">span</span>() |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_span</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">span</span>: <span class="ident">Span</span>) { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">token</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Literal</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">clone</span>() |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">Literal</span><span class="op">></span> <span class="kw">for</span> <span class="ident">LitFloat</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">token</span>: <span class="ident">Literal</span>) -> <span class="self">Self</span> { |
| <span class="kw">let</span> <span class="ident">repr</span> <span class="op">=</span> <span class="ident">token</span>.<span class="ident">to_string</span>(); |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">digits</span>, <span class="ident">suffix</span>)) <span class="op">=</span> <span class="ident">value::parse_lit_float</span>(<span class="kw-2">&</span><span class="ident">repr</span>) { |
| <span class="ident">LitFloat</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitFloatRepr</span> { |
| <span class="ident">token</span>, |
| <span class="ident">digits</span>, |
| <span class="ident">suffix</span>, |
| }), |
| } |
| } <span class="kw">else</span> { |
| <span class="macro">panic!</span>(<span class="string">"Not a float literal: `{}`"</span>, <span class="ident">repr</span>); |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">LitFloat</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">fmt</span>(<span class="ident">formatter</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">LitBool</span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">value</span>: <span class="ident">bool</span>, <span class="ident">span</span>: <span class="ident">Span</span>) -> <span class="self">Self</span> { |
| <span class="ident">LitBool</span> { <span class="ident">value</span>, <span class="ident">span</span> } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">value</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">value</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">span</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Span</span> { |
| <span class="self">self</span>.<span class="ident">span</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_span</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">span</span>: <span class="ident">Span</span>) { |
| <span class="self">self</span>.<span class="ident">span</span> <span class="op">=</span> <span class="ident">span</span>; |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">token</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Ident</span> { |
| <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">value</span> { <span class="string">"true"</span> } <span class="kw">else</span> { <span class="string">"false"</span> }; |
| <span class="ident">Ident::new</span>(<span class="ident">s</span>, <span class="self">self</span>.<span class="ident">span</span>) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>)]</span> |
| <span class="kw">mod</span> <span class="ident">debug_impls</span> { |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use</span> <span class="ident">std::fmt</span>::{<span class="self">self</span>, <span class="ident">Debug</span>}; |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">LitStr</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="ident">formatter</span> |
| .<span class="ident">debug_struct</span>(<span class="string">"LitStr"</span>) |
| .<span class="ident">field</span>(<span class="string">"token"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>)) |
| .<span class="ident">finish</span>() |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">LitByteStr</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="ident">formatter</span> |
| .<span class="ident">debug_struct</span>(<span class="string">"LitByteStr"</span>) |
| .<span class="ident">field</span>(<span class="string">"token"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>)) |
| .<span class="ident">finish</span>() |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">LitByte</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="ident">formatter</span> |
| .<span class="ident">debug_struct</span>(<span class="string">"LitByte"</span>) |
| .<span class="ident">field</span>(<span class="string">"token"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>)) |
| .<span class="ident">finish</span>() |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">LitChar</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="ident">formatter</span> |
| .<span class="ident">debug_struct</span>(<span class="string">"LitChar"</span>) |
| .<span class="ident">field</span>(<span class="string">"token"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>)) |
| .<span class="ident">finish</span>() |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">LitInt</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="ident">formatter</span> |
| .<span class="ident">debug_struct</span>(<span class="string">"LitInt"</span>) |
| .<span class="ident">field</span>(<span class="string">"token"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>)) |
| .<span class="ident">finish</span>() |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">LitFloat</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="ident">formatter</span> |
| .<span class="ident">debug_struct</span>(<span class="string">"LitFloat"</span>) |
| .<span class="ident">field</span>(<span class="string">"token"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>)) |
| .<span class="ident">finish</span>() |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">LitBool</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="ident">formatter</span> |
| .<span class="ident">debug_struct</span>(<span class="string">"LitBool"</span>) |
| .<span class="ident">field</span>(<span class="string">"value"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">value</span>) |
| .<span class="ident">finish</span>() |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone-impls"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone-impls"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">LitRepr</span> { |
| <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span> { |
| <span class="ident">LitRepr</span> { |
| <span class="ident">token</span>: <span class="self">self</span>.<span class="ident">token</span>.<span class="ident">clone</span>(), |
| <span class="ident">suffix</span>: <span class="self">self</span>.<span class="ident">suffix</span>.<span class="ident">clone</span>(), |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone-impls"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone-impls"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">LitIntRepr</span> { |
| <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span> { |
| <span class="ident">LitIntRepr</span> { |
| <span class="ident">token</span>: <span class="self">self</span>.<span class="ident">token</span>.<span class="ident">clone</span>(), |
| <span class="ident">digits</span>: <span class="self">self</span>.<span class="ident">digits</span>.<span class="ident">clone</span>(), |
| <span class="ident">suffix</span>: <span class="self">self</span>.<span class="ident">suffix</span>.<span class="ident">clone</span>(), |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone-impls"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone-impls"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">LitFloatRepr</span> { |
| <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span> { |
| <span class="ident">LitFloatRepr</span> { |
| <span class="ident">token</span>: <span class="self">self</span>.<span class="ident">token</span>.<span class="ident">clone</span>(), |
| <span class="ident">digits</span>: <span class="self">self</span>.<span class="ident">digits</span>.<span class="ident">clone</span>(), |
| <span class="ident">suffix</span>: <span class="self">self</span>.<span class="ident">suffix</span>.<span class="ident">clone</span>(), |
| } |
| } |
| } |
| |
| <span class="macro">macro_rules!</span> <span class="ident">lit_extra_traits</span> { |
| (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">ident</span>) => { |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone-impls"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone-impls"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> { |
| <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span> { |
| <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> { |
| <span class="ident">repr</span>: <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">clone</span>(), |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> { |
| <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">to_string</span>() <span class="op">==</span> <span class="ident">other</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">to_string</span>() |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Hash</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> { |
| <span class="kw">fn</span> <span class="ident">hash</span><span class="op"><</span><span class="ident">H</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">state</span>: <span class="kw-2">&mut</span> <span class="ident">H</span>) |
| <span class="kw">where</span> |
| <span class="ident">H</span>: <span class="ident">Hasher</span>, |
| { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">to_string</span>().<span class="ident">hash</span>(<span class="ident">state</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)]</span> |
| <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_snake_case</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>(<span class="ident">marker</span>: <span class="ident">lookahead::TokenMarker</span>) -> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> { |
| <span class="kw">match</span> <span class="ident">marker</span> {} |
| } |
| }; |
| } |
| |
| <span class="macro">lit_extra_traits!</span>(<span class="ident">LitStr</span>); |
| <span class="macro">lit_extra_traits!</span>(<span class="ident">LitByteStr</span>); |
| <span class="macro">lit_extra_traits!</span>(<span class="ident">LitByte</span>); |
| <span class="macro">lit_extra_traits!</span>(<span class="ident">LitChar</span>); |
| <span class="macro">lit_extra_traits!</span>(<span class="ident">LitInt</span>); |
| <span class="macro">lit_extra_traits!</span>(<span class="ident">LitFloat</span>); |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)]</span> |
| <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_snake_case</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">LitBool</span>(<span class="ident">marker</span>: <span class="ident">lookahead::TokenMarker</span>) -> <span class="ident">LitBool</span> { |
| <span class="kw">match</span> <span class="ident">marker</span> {} |
| } |
| |
| <span class="macro">ast_enum!</span> { |
| <span class="doccomment">/// The style of a string literal, either plain quoted or a raw string like</span> |
| <span class="doccomment">/// `r##"data"##`.</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">StrStyle</span> #<span class="ident">no_visit</span> { |
| <span class="doccomment">/// An ordinary string like `"data"`.</span> |
| <span class="ident">Cooked</span>, |
| <span class="doccomment">/// A raw string like `r##"data"##`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The unsigned integer is the number of `#` symbols used.</span> |
| <span class="ident">Raw</span>(<span class="ident">usize</span>), |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)]</span> |
| <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_snake_case</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">Lit</span>(<span class="ident">marker</span>: <span class="ident">lookahead::TokenMarker</span>) -> <span class="ident">Lit</span> { |
| <span class="kw">match</span> <span class="ident">marker</span> {} |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">parsing</span> { |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::buffer::Cursor</span>; |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::parse</span>::{<span class="ident">Parse</span>, <span class="ident">ParseStream</span>, <span class="prelude-ty">Result</span>}; |
| <span class="kw">use</span> <span class="ident">proc_macro2::Punct</span>; |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">Lit</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="ident">input</span>.<span class="ident">step</span>(<span class="op">|</span><span class="ident">cursor</span><span class="op">|</span> { |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">lit</span>, <span class="ident">rest</span>)) <span class="op">=</span> <span class="ident">cursor</span>.<span class="ident">literal</span>() { |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>((<span class="ident">Lit::new</span>(<span class="ident">lit</span>), <span class="ident">rest</span>)); |
| } |
| |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">ident</span>, <span class="ident">rest</span>)) <span class="op">=</span> <span class="ident">cursor</span>.<span class="ident">ident</span>() { |
| <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">ident</span> <span class="op">==</span> <span class="string">"true"</span>; |
| <span class="kw">if</span> <span class="ident">value</span> <span class="op">|</span><span class="op">|</span> <span class="ident">ident</span> <span class="op">==</span> <span class="string">"false"</span> { |
| <span class="kw">let</span> <span class="ident">lit_bool</span> <span class="op">=</span> <span class="ident">LitBool</span> { |
| <span class="ident">value</span>, |
| <span class="ident">span</span>: <span class="ident">ident</span>.<span class="ident">span</span>(), |
| }; |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>((<span class="ident">Lit::Bool</span>(<span class="ident">lit_bool</span>), <span class="ident">rest</span>)); |
| } |
| } |
| |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">punct</span>, <span class="ident">rest</span>)) <span class="op">=</span> <span class="ident">cursor</span>.<span class="ident">punct</span>() { |
| <span class="kw">if</span> <span class="ident">punct</span>.<span class="ident">as_char</span>() <span class="op">==</span> <span class="string">'-'</span> { |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">lit</span>, <span class="ident">rest</span>)) <span class="op">=</span> <span class="ident">parse_negative_lit</span>(<span class="ident">punct</span>, <span class="ident">rest</span>) { |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>((<span class="ident">lit</span>, <span class="ident">rest</span>)); |
| } |
| } |
| } |
| |
| <span class="prelude-val">Err</span>(<span class="ident">cursor</span>.<span class="ident">error</span>(<span class="string">"expected literal"</span>)) |
| }) |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">parse_negative_lit</span>(<span class="ident">neg</span>: <span class="ident">Punct</span>, <span class="ident">cursor</span>: <span class="ident">Cursor</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">Lit</span>, <span class="ident">Cursor</span>)<span class="op">></span> { |
| <span class="kw">let</span> (<span class="ident">lit</span>, <span class="ident">rest</span>) <span class="op">=</span> <span class="ident">cursor</span>.<span class="ident">literal</span>()<span class="question-mark">?</span>; |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">span</span> <span class="op">=</span> <span class="ident">neg</span>.<span class="ident">span</span>(); |
| <span class="ident">span</span> <span class="op">=</span> <span class="ident">span</span>.<span class="ident">join</span>(<span class="ident">lit</span>.<span class="ident">span</span>()).<span class="ident">unwrap_or</span>(<span class="ident">span</span>); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">repr</span> <span class="op">=</span> <span class="ident">lit</span>.<span class="ident">to_string</span>(); |
| <span class="ident">repr</span>.<span class="ident">insert</span>(<span class="number">0</span>, <span class="string">'-'</span>); |
| |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">digits</span>, <span class="ident">suffix</span>)) <span class="op">=</span> <span class="ident">value::parse_lit_int</span>(<span class="kw-2">&</span><span class="ident">repr</span>) { |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">token</span>) <span class="op">=</span> <span class="ident">value::to_literal</span>(<span class="kw-2">&</span><span class="ident">repr</span>, <span class="kw-2">&</span><span class="ident">digits</span>, <span class="kw-2">&</span><span class="ident">suffix</span>) { |
| <span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| <span class="kw">return</span> <span class="prelude-val">Some</span>(( |
| <span class="ident">Lit::Int</span>(<span class="ident">LitInt</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitIntRepr</span> { |
| <span class="ident">token</span>, |
| <span class="ident">digits</span>, |
| <span class="ident">suffix</span>, |
| }), |
| }), |
| <span class="ident">rest</span>, |
| )); |
| } |
| } |
| |
| <span class="kw">let</span> (<span class="ident">digits</span>, <span class="ident">suffix</span>) <span class="op">=</span> <span class="ident">value::parse_lit_float</span>(<span class="kw-2">&</span><span class="ident">repr</span>)<span class="question-mark">?</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">token</span> <span class="op">=</span> <span class="ident">value::to_literal</span>(<span class="kw-2">&</span><span class="ident">repr</span>, <span class="kw-2">&</span><span class="ident">digits</span>, <span class="kw-2">&</span><span class="ident">suffix</span>)<span class="question-mark">?</span>; |
| <span class="ident">token</span>.<span class="ident">set_span</span>(<span class="ident">span</span>); |
| <span class="prelude-val">Some</span>(( |
| <span class="ident">Lit::Float</span>(<span class="ident">LitFloat</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitFloatRepr</span> { |
| <span class="ident">token</span>, |
| <span class="ident">digits</span>, |
| <span class="ident">suffix</span>, |
| }), |
| }), |
| <span class="ident">rest</span>, |
| )) |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">LitStr</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">head</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">fork</span>(); |
| <span class="kw">match</span> <span class="ident">input</span>.<span class="ident">parse</span>() { |
| <span class="prelude-val">Ok</span>(<span class="ident">Lit::Str</span>(<span class="ident">lit</span>)) => <span class="prelude-val">Ok</span>(<span class="ident">lit</span>), |
| <span class="kw">_</span> => <span class="prelude-val">Err</span>(<span class="ident">head</span>.<span class="ident">error</span>(<span class="string">"expected string literal"</span>)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">LitByteStr</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">head</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">fork</span>(); |
| <span class="kw">match</span> <span class="ident">input</span>.<span class="ident">parse</span>() { |
| <span class="prelude-val">Ok</span>(<span class="ident">Lit::ByteStr</span>(<span class="ident">lit</span>)) => <span class="prelude-val">Ok</span>(<span class="ident">lit</span>), |
| <span class="kw">_</span> => <span class="prelude-val">Err</span>(<span class="ident">head</span>.<span class="ident">error</span>(<span class="string">"expected byte string literal"</span>)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">LitByte</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">head</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">fork</span>(); |
| <span class="kw">match</span> <span class="ident">input</span>.<span class="ident">parse</span>() { |
| <span class="prelude-val">Ok</span>(<span class="ident">Lit::Byte</span>(<span class="ident">lit</span>)) => <span class="prelude-val">Ok</span>(<span class="ident">lit</span>), |
| <span class="kw">_</span> => <span class="prelude-val">Err</span>(<span class="ident">head</span>.<span class="ident">error</span>(<span class="string">"expected byte literal"</span>)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">LitChar</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">head</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">fork</span>(); |
| <span class="kw">match</span> <span class="ident">input</span>.<span class="ident">parse</span>() { |
| <span class="prelude-val">Ok</span>(<span class="ident">Lit::Char</span>(<span class="ident">lit</span>)) => <span class="prelude-val">Ok</span>(<span class="ident">lit</span>), |
| <span class="kw">_</span> => <span class="prelude-val">Err</span>(<span class="ident">head</span>.<span class="ident">error</span>(<span class="string">"expected character literal"</span>)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">LitInt</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">head</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">fork</span>(); |
| <span class="kw">match</span> <span class="ident">input</span>.<span class="ident">parse</span>() { |
| <span class="prelude-val">Ok</span>(<span class="ident">Lit::Int</span>(<span class="ident">lit</span>)) => <span class="prelude-val">Ok</span>(<span class="ident">lit</span>), |
| <span class="kw">_</span> => <span class="prelude-val">Err</span>(<span class="ident">head</span>.<span class="ident">error</span>(<span class="string">"expected integer literal"</span>)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">LitFloat</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">head</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">fork</span>(); |
| <span class="kw">match</span> <span class="ident">input</span>.<span class="ident">parse</span>() { |
| <span class="prelude-val">Ok</span>(<span class="ident">Lit::Float</span>(<span class="ident">lit</span>)) => <span class="prelude-val">Ok</span>(<span class="ident">lit</span>), |
| <span class="kw">_</span> => <span class="prelude-val">Err</span>(<span class="ident">head</span>.<span class="ident">error</span>(<span class="string">"expected floating point literal"</span>)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">LitBool</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">head</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">fork</span>(); |
| <span class="kw">match</span> <span class="ident">input</span>.<span class="ident">parse</span>() { |
| <span class="prelude-val">Ok</span>(<span class="ident">Lit::Bool</span>(<span class="ident">lit</span>)) => <span class="prelude-val">Ok</span>(<span class="ident">lit</span>), |
| <span class="kw">_</span> => <span class="prelude-val">Err</span>(<span class="ident">head</span>.<span class="ident">error</span>(<span class="string">"expected boolean literal"</span>)), |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)]</span> |
| <span class="kw">mod</span> <span class="ident">printing</span> { |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use</span> <span class="ident">proc_macro2::TokenStream</span>; |
| <span class="kw">use</span> <span class="ident">quote</span>::{<span class="ident">ToTokens</span>, <span class="ident">TokenStreamExt</span>}; |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">LitStr</span> { |
| <span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">LitByteStr</span> { |
| <span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">LitByte</span> { |
| <span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">LitChar</span> { |
| <span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">LitInt</span> { |
| <span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">LitFloat</span> { |
| <span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="self">self</span>.<span class="ident">repr</span>.<span class="ident">token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">LitBool</span> { |
| <span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="self">self</span>.<span class="ident">token</span>()); |
| } |
| } |
| } |
| |
| <span class="kw">mod</span> <span class="ident">value</span> { |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::bigint::BigInt</span>; |
| <span class="kw">use</span> <span class="ident">std::char</span>; |
| <span class="kw">use</span> <span class="ident">std::ops</span>::{<span class="ident">Index</span>, <span class="ident">RangeFrom</span>}; |
| |
| <span class="kw">impl</span> <span class="ident">Lit</span> { |
| <span class="doccomment">/// Interpret a Syn literal from a proc-macro2 literal.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">token</span>: <span class="ident">Literal</span>) -> <span class="self">Self</span> { |
| <span class="kw">let</span> <span class="ident">repr</span> <span class="op">=</span> <span class="ident">token</span>.<span class="ident">to_string</span>(); |
| |
| <span class="kw">match</span> <span class="ident">byte</span>(<span class="kw-2">&</span><span class="ident">repr</span>, <span class="number">0</span>) { |
| <span class="string">b'"'</span> <span class="op">|</span> <span class="string">b'r'</span> => { |
| <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">suffix</span>) <span class="op">=</span> <span class="ident">parse_lit_str</span>(<span class="kw-2">&</span><span class="ident">repr</span>); |
| <span class="kw">return</span> <span class="ident">Lit::Str</span>(<span class="ident">LitStr</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitRepr</span> { <span class="ident">token</span>, <span class="ident">suffix</span> }), |
| }); |
| } |
| <span class="string">b'b'</span> => <span class="kw">match</span> <span class="ident">byte</span>(<span class="kw-2">&</span><span class="ident">repr</span>, <span class="number">1</span>) { |
| <span class="string">b'"'</span> <span class="op">|</span> <span class="string">b'r'</span> => { |
| <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">suffix</span>) <span class="op">=</span> <span class="ident">parse_lit_byte_str</span>(<span class="kw-2">&</span><span class="ident">repr</span>); |
| <span class="kw">return</span> <span class="ident">Lit::ByteStr</span>(<span class="ident">LitByteStr</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitRepr</span> { <span class="ident">token</span>, <span class="ident">suffix</span> }), |
| }); |
| } |
| <span class="string">b'\''</span> => { |
| <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">suffix</span>) <span class="op">=</span> <span class="ident">parse_lit_byte</span>(<span class="kw-2">&</span><span class="ident">repr</span>); |
| <span class="kw">return</span> <span class="ident">Lit::Byte</span>(<span class="ident">LitByte</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitRepr</span> { <span class="ident">token</span>, <span class="ident">suffix</span> }), |
| }); |
| } |
| <span class="kw">_</span> => {} |
| }, |
| <span class="string">b'\''</span> => { |
| <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">suffix</span>) <span class="op">=</span> <span class="ident">parse_lit_char</span>(<span class="kw-2">&</span><span class="ident">repr</span>); |
| <span class="kw">return</span> <span class="ident">Lit::Char</span>(<span class="ident">LitChar</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitRepr</span> { <span class="ident">token</span>, <span class="ident">suffix</span> }), |
| }); |
| } |
| <span class="string">b'0'</span>..<span class="op">=</span><span class="string">b'9'</span> <span class="op">|</span> <span class="string">b'-'</span> => { |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">digits</span>, <span class="ident">suffix</span>)) <span class="op">=</span> <span class="ident">parse_lit_int</span>(<span class="kw-2">&</span><span class="ident">repr</span>) { |
| <span class="kw">return</span> <span class="ident">Lit::Int</span>(<span class="ident">LitInt</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitIntRepr</span> { |
| <span class="ident">token</span>, |
| <span class="ident">digits</span>, |
| <span class="ident">suffix</span>, |
| }), |
| }); |
| } |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">digits</span>, <span class="ident">suffix</span>)) <span class="op">=</span> <span class="ident">parse_lit_float</span>(<span class="kw-2">&</span><span class="ident">repr</span>) { |
| <span class="kw">return</span> <span class="ident">Lit::Float</span>(<span class="ident">LitFloat</span> { |
| <span class="ident">repr</span>: <span class="ident">Box::new</span>(<span class="ident">LitFloatRepr</span> { |
| <span class="ident">token</span>, |
| <span class="ident">digits</span>, |
| <span class="ident">suffix</span>, |
| }), |
| }); |
| } |
| } |
| <span class="string">b't'</span> <span class="op">|</span> <span class="string">b'f'</span> => { |
| <span class="kw">if</span> <span class="ident">repr</span> <span class="op">==</span> <span class="string">"true"</span> <span class="op">|</span><span class="op">|</span> <span class="ident">repr</span> <span class="op">==</span> <span class="string">"false"</span> { |
| <span class="kw">return</span> <span class="ident">Lit::Bool</span>(<span class="ident">LitBool</span> { |
| <span class="ident">value</span>: <span class="ident">repr</span> <span class="op">==</span> <span class="string">"true"</span>, |
| <span class="ident">span</span>: <span class="ident">token</span>.<span class="ident">span</span>(), |
| }); |
| } |
| } |
| <span class="kw">_</span> => {} |
| } |
| |
| <span class="macro">panic!</span>(<span class="string">"Unrecognized literal: `{}`"</span>, <span class="ident">repr</span>); |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">suffix</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="ident">str</span> { |
| <span class="kw">match</span> <span class="self">self</span> { |
| <span class="ident">Lit::Str</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">suffix</span>(), |
| <span class="ident">Lit::ByteStr</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">suffix</span>(), |
| <span class="ident">Lit::Byte</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">suffix</span>(), |
| <span class="ident">Lit::Char</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">suffix</span>(), |
| <span class="ident">Lit::Int</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">suffix</span>(), |
| <span class="ident">Lit::Float</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">suffix</span>(), |
| <span class="ident">Lit::Bool</span>(<span class="kw">_</span>) <span class="op">|</span> <span class="ident">Lit::Verbatim</span>(<span class="kw">_</span>) => <span class="string">""</span>, |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">span</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Span</span> { |
| <span class="kw">match</span> <span class="self">self</span> { |
| <span class="ident">Lit::Str</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">span</span>(), |
| <span class="ident">Lit::ByteStr</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">span</span>(), |
| <span class="ident">Lit::Byte</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">span</span>(), |
| <span class="ident">Lit::Char</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">span</span>(), |
| <span class="ident">Lit::Int</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">span</span>(), |
| <span class="ident">Lit::Float</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">span</span>(), |
| <span class="ident">Lit::Bool</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">span</span>, |
| <span class="ident">Lit::Verbatim</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">span</span>(), |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_span</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">span</span>: <span class="ident">Span</span>) { |
| <span class="kw">match</span> <span class="self">self</span> { |
| <span class="ident">Lit::Str</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">set_span</span>(<span class="ident">span</span>), |
| <span class="ident">Lit::ByteStr</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">set_span</span>(<span class="ident">span</span>), |
| <span class="ident">Lit::Byte</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">set_span</span>(<span class="ident">span</span>), |
| <span class="ident">Lit::Char</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">set_span</span>(<span class="ident">span</span>), |
| <span class="ident">Lit::Int</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">set_span</span>(<span class="ident">span</span>), |
| <span class="ident">Lit::Float</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">set_span</span>(<span class="ident">span</span>), |
| <span class="ident">Lit::Bool</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">span</span> <span class="op">=</span> <span class="ident">span</span>, |
| <span class="ident">Lit::Verbatim</span>(<span class="ident">lit</span>) => <span class="ident">lit</span>.<span class="ident">set_span</span>(<span class="ident">span</span>), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Get the byte at offset idx, or a default of `b'\0'` if we're looking</span> |
| <span class="doccomment">/// past the end of the input buffer.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">byte</span><span class="op"><</span><span class="ident">S</span>: <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">></span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">S</span>, <span class="ident">idx</span>: <span class="ident">usize</span>) -> <span class="ident">u8</span> { |
| <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">as_ref</span>(); |
| <span class="kw">if</span> <span class="ident">idx</span> <span class="op"><</span> <span class="ident">s</span>.<span class="ident">len</span>() { |
| <span class="ident">s</span>[<span class="ident">idx</span>] |
| } <span class="kw">else</span> { |
| <span class="number">0</span> |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">next_chr</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> <span class="ident">char</span> { |
| <span class="ident">s</span>.<span class="ident">chars</span>().<span class="ident">next</span>().<span class="ident">unwrap_or</span>(<span class="string">'\0'</span>) |
| } |
| |
| <span class="comment">// Returns (content, suffix).</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_lit_str</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> (<span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>) { |
| <span class="kw">match</span> <span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>) { |
| <span class="string">b'"'</span> => <span class="ident">parse_lit_str_cooked</span>(<span class="ident">s</span>), |
| <span class="string">b'r'</span> => <span class="ident">parse_lit_str_raw</span>(<span class="ident">s</span>), |
| <span class="kw">_</span> => <span class="macro">unreachable!</span>(), |
| } |
| } |
| |
| <span class="comment">// Clippy false positive</span> |
| <span class="comment">// https://github.com/rust-lang-nursery/rust-clippy/issues/2329</span> |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::needless_continue</span>)]</span> |
| <span class="kw">fn</span> <span class="ident">parse_lit_str_cooked</span>(<span class="kw-2">mut</span> <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> (<span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>) { |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>), <span class="string">b'"'</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">1</span>..]; |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">content</span> <span class="op">=</span> <span class="ident">String::new</span>(); |
| <span class="lifetime">'outer</span>: <span class="kw">loop</span> { |
| <span class="kw">let</span> <span class="ident">ch</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>) { |
| <span class="string">b'"'</span> => <span class="kw">break</span>, |
| <span class="string">b'\\'</span> => { |
| <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">1</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">2</span>..]; |
| <span class="kw">match</span> <span class="ident">b</span> { |
| <span class="string">b'x'</span> => { |
| <span class="kw">let</span> (<span class="ident">byte</span>, <span class="ident">rest</span>) <span class="op">=</span> <span class="ident">backslash_x</span>(<span class="ident">s</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="ident">rest</span>; |
| <span class="macro">assert!</span>(<span class="ident">byte</span> <span class="op"><</span><span class="op">=</span> <span class="number">0x80</span>, <span class="string">"Invalid \\x byte in string literal"</span>); |
| <span class="ident">char::from_u32</span>(<span class="ident">u32::from</span>(<span class="ident">byte</span>)).<span class="ident">unwrap</span>() |
| } |
| <span class="string">b'u'</span> => { |
| <span class="kw">let</span> (<span class="ident">chr</span>, <span class="ident">rest</span>) <span class="op">=</span> <span class="ident">backslash_u</span>(<span class="ident">s</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="ident">rest</span>; |
| <span class="ident">chr</span> |
| } |
| <span class="string">b'n'</span> => <span class="string">'\n'</span>, |
| <span class="string">b'r'</span> => <span class="string">'\r'</span>, |
| <span class="string">b't'</span> => <span class="string">'\t'</span>, |
| <span class="string">b'\\'</span> => <span class="string">'\\'</span>, |
| <span class="string">b'0'</span> => <span class="string">'\0'</span>, |
| <span class="string">b'\''</span> => <span class="string">'\''</span>, |
| <span class="string">b'"'</span> => <span class="string">'"'</span>, |
| <span class="string">b'\r'</span> <span class="op">|</span> <span class="string">b'\n'</span> => <span class="kw">loop</span> { |
| <span class="kw">let</span> <span class="ident">ch</span> <span class="op">=</span> <span class="ident">next_chr</span>(<span class="ident">s</span>); |
| <span class="kw">if</span> <span class="ident">ch</span>.<span class="ident">is_whitespace</span>() { |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="ident">ch</span>.<span class="ident">len_utf8</span>()..]; |
| } <span class="kw">else</span> { |
| <span class="kw">continue</span> <span class="lifetime">'outer</span>; |
| } |
| }, |
| <span class="ident">b</span> => <span class="macro">panic!</span>(<span class="string">"unexpected byte {:?} after \\ character in byte literal"</span>, <span class="ident">b</span>), |
| } |
| } |
| <span class="string">b'\r'</span> => { |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">1</span>), <span class="string">b'\n'</span>, <span class="string">"Bare CR not allowed in string"</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">2</span>..]; |
| <span class="string">'\n'</span> |
| } |
| <span class="kw">_</span> => { |
| <span class="kw">let</span> <span class="ident">ch</span> <span class="op">=</span> <span class="ident">next_chr</span>(<span class="ident">s</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="ident">ch</span>.<span class="ident">len_utf8</span>()..]; |
| <span class="ident">ch</span> |
| } |
| }; |
| <span class="ident">content</span>.<span class="ident">push</span>(<span class="ident">ch</span>); |
| } |
| |
| <span class="macro">assert!</span>(<span class="ident">s</span>.<span class="ident">starts_with</span>(<span class="string">'"'</span>)); |
| <span class="kw">let</span> <span class="ident">content</span> <span class="op">=</span> <span class="ident">content</span>.<span class="ident">into_boxed_str</span>(); |
| <span class="kw">let</span> <span class="ident">suffix</span> <span class="op">=</span> <span class="ident">s</span>[<span class="number">1</span>..].<span class="ident">to_owned</span>().<span class="ident">into_boxed_str</span>(); |
| (<span class="ident">content</span>, <span class="ident">suffix</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">parse_lit_str_raw</span>(<span class="kw-2">mut</span> <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> (<span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>) { |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>), <span class="string">b'r'</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">1</span>..]; |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pounds</span> <span class="op">=</span> <span class="number">0</span>; |
| <span class="kw">while</span> <span class="ident">byte</span>(<span class="ident">s</span>, <span class="ident">pounds</span>) <span class="op">==</span> <span class="string">b'#'</span> { |
| <span class="ident">pounds</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>; |
| } |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">s</span>, <span class="ident">pounds</span>), <span class="string">b'"'</span>); |
| <span class="kw">let</span> <span class="ident">close</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">rfind</span>(<span class="string">'"'</span>).<span class="ident">unwrap</span>(); |
| <span class="kw">for</span> <span class="ident">end</span> <span class="kw">in</span> <span class="ident">s</span>[<span class="ident">close</span> <span class="op">+</span> <span class="number">1</span>..<span class="ident">close</span> <span class="op">+</span> <span class="number">1</span> <span class="op">+</span> <span class="ident">pounds</span>].<span class="ident">bytes</span>() { |
| <span class="macro">assert_eq!</span>(<span class="ident">end</span>, <span class="string">b'#'</span>); |
| } |
| |
| <span class="kw">let</span> <span class="ident">content</span> <span class="op">=</span> <span class="ident">s</span>[<span class="ident">pounds</span> <span class="op">+</span> <span class="number">1</span>..<span class="ident">close</span>].<span class="ident">to_owned</span>().<span class="ident">into_boxed_str</span>(); |
| <span class="kw">let</span> <span class="ident">suffix</span> <span class="op">=</span> <span class="ident">s</span>[<span class="ident">close</span> <span class="op">+</span> <span class="number">1</span> <span class="op">+</span> <span class="ident">pounds</span>..].<span class="ident">to_owned</span>().<span class="ident">into_boxed_str</span>(); |
| (<span class="ident">content</span>, <span class="ident">suffix</span>) |
| } |
| |
| <span class="comment">// Returns (content, suffix).</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_lit_byte_str</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> (<span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>) { |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>), <span class="string">b'b'</span>); |
| <span class="kw">match</span> <span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">1</span>) { |
| <span class="string">b'"'</span> => <span class="ident">parse_lit_byte_str_cooked</span>(<span class="ident">s</span>), |
| <span class="string">b'r'</span> => <span class="ident">parse_lit_byte_str_raw</span>(<span class="ident">s</span>), |
| <span class="kw">_</span> => <span class="macro">unreachable!</span>(), |
| } |
| } |
| |
| <span class="comment">// Clippy false positive</span> |
| <span class="comment">// https://github.com/rust-lang-nursery/rust-clippy/issues/2329</span> |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::needless_continue</span>)]</span> |
| <span class="kw">fn</span> <span class="ident">parse_lit_byte_str_cooked</span>(<span class="kw-2">mut</span> <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> (<span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>) { |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>), <span class="string">b'b'</span>); |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">1</span>), <span class="string">b'"'</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">2</span>..]; |
| |
| <span class="comment">// We're going to want to have slices which don't respect codepoint boundaries.</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">as_bytes</span>(); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">out</span> <span class="op">=</span> <span class="ident">Vec::new</span>(); |
| <span class="lifetime">'outer</span>: <span class="kw">loop</span> { |
| <span class="kw">let</span> <span class="ident">byte</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">byte</span>(<span class="ident">v</span>, <span class="number">0</span>) { |
| <span class="string">b'"'</span> => <span class="kw">break</span>, |
| <span class="string">b'\\'</span> => { |
| <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">byte</span>(<span class="ident">v</span>, <span class="number">1</span>); |
| <span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">v</span>[<span class="number">2</span>..]; |
| <span class="kw">match</span> <span class="ident">b</span> { |
| <span class="string">b'x'</span> => { |
| <span class="kw">let</span> (<span class="ident">b</span>, <span class="ident">rest</span>) <span class="op">=</span> <span class="ident">backslash_x</span>(<span class="ident">v</span>); |
| <span class="ident">v</span> <span class="op">=</span> <span class="ident">rest</span>; |
| <span class="ident">b</span> |
| } |
| <span class="string">b'n'</span> => <span class="string">b'\n'</span>, |
| <span class="string">b'r'</span> => <span class="string">b'\r'</span>, |
| <span class="string">b't'</span> => <span class="string">b'\t'</span>, |
| <span class="string">b'\\'</span> => <span class="string">b'\\'</span>, |
| <span class="string">b'0'</span> => <span class="string">b'\0'</span>, |
| <span class="string">b'\''</span> => <span class="string">b'\''</span>, |
| <span class="string">b'"'</span> => <span class="string">b'"'</span>, |
| <span class="string">b'\r'</span> <span class="op">|</span> <span class="string">b'\n'</span> => <span class="kw">loop</span> { |
| <span class="kw">let</span> <span class="ident">byte</span> <span class="op">=</span> <span class="ident">byte</span>(<span class="ident">v</span>, <span class="number">0</span>); |
| <span class="kw">let</span> <span class="ident">ch</span> <span class="op">=</span> <span class="ident">char::from_u32</span>(<span class="ident">u32::from</span>(<span class="ident">byte</span>)).<span class="ident">unwrap</span>(); |
| <span class="kw">if</span> <span class="ident">ch</span>.<span class="ident">is_whitespace</span>() { |
| <span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">v</span>[<span class="number">1</span>..]; |
| } <span class="kw">else</span> { |
| <span class="kw">continue</span> <span class="lifetime">'outer</span>; |
| } |
| }, |
| <span class="ident">b</span> => <span class="macro">panic!</span>(<span class="string">"unexpected byte {:?} after \\ character in byte literal"</span>, <span class="ident">b</span>), |
| } |
| } |
| <span class="string">b'\r'</span> => { |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">v</span>, <span class="number">1</span>), <span class="string">b'\n'</span>, <span class="string">"Bare CR not allowed in string"</span>); |
| <span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">v</span>[<span class="number">2</span>..]; |
| <span class="string">b'\n'</span> |
| } |
| <span class="ident">b</span> => { |
| <span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">v</span>[<span class="number">1</span>..]; |
| <span class="ident">b</span> |
| } |
| }; |
| <span class="ident">out</span>.<span class="ident">push</span>(<span class="ident">byte</span>); |
| } |
| |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">v</span>, <span class="number">0</span>), <span class="string">b'"'</span>); |
| <span class="kw">let</span> <span class="ident">suffix</span> <span class="op">=</span> <span class="ident">s</span>[<span class="ident">s</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">v</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="number">1</span>..].<span class="ident">to_owned</span>().<span class="ident">into_boxed_str</span>(); |
| (<span class="ident">out</span>, <span class="ident">suffix</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">parse_lit_byte_str_raw</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> (<span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>) { |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>), <span class="string">b'b'</span>); |
| <span class="kw">let</span> (<span class="ident">value</span>, <span class="ident">suffix</span>) <span class="op">=</span> <span class="ident">parse_lit_str_raw</span>(<span class="kw-2">&</span><span class="ident">s</span>[<span class="number">1</span>..]); |
| (<span class="ident">String::from</span>(<span class="ident">value</span>).<span class="ident">into_bytes</span>(), <span class="ident">suffix</span>) |
| } |
| |
| <span class="comment">// Returns (value, suffix).</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_lit_byte</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> (<span class="ident">u8</span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>) { |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>), <span class="string">b'b'</span>); |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">1</span>), <span class="string">b'\''</span>); |
| |
| <span class="comment">// We're going to want to have slices which don't respect codepoint boundaries.</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">s</span>[<span class="number">2</span>..].<span class="ident">as_bytes</span>(); |
| |
| <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">byte</span>(<span class="ident">v</span>, <span class="number">0</span>) { |
| <span class="string">b'\\'</span> => { |
| <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">byte</span>(<span class="ident">v</span>, <span class="number">1</span>); |
| <span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">v</span>[<span class="number">2</span>..]; |
| <span class="kw">match</span> <span class="ident">b</span> { |
| <span class="string">b'x'</span> => { |
| <span class="kw">let</span> (<span class="ident">b</span>, <span class="ident">rest</span>) <span class="op">=</span> <span class="ident">backslash_x</span>(<span class="ident">v</span>); |
| <span class="ident">v</span> <span class="op">=</span> <span class="ident">rest</span>; |
| <span class="ident">b</span> |
| } |
| <span class="string">b'n'</span> => <span class="string">b'\n'</span>, |
| <span class="string">b'r'</span> => <span class="string">b'\r'</span>, |
| <span class="string">b't'</span> => <span class="string">b'\t'</span>, |
| <span class="string">b'\\'</span> => <span class="string">b'\\'</span>, |
| <span class="string">b'0'</span> => <span class="string">b'\0'</span>, |
| <span class="string">b'\''</span> => <span class="string">b'\''</span>, |
| <span class="string">b'"'</span> => <span class="string">b'"'</span>, |
| <span class="ident">b</span> => <span class="macro">panic!</span>(<span class="string">"unexpected byte {:?} after \\ character in byte literal"</span>, <span class="ident">b</span>), |
| } |
| } |
| <span class="ident">b</span> => { |
| <span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">v</span>[<span class="number">1</span>..]; |
| <span class="ident">b</span> |
| } |
| }; |
| |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">v</span>, <span class="number">0</span>), <span class="string">b'\''</span>); |
| <span class="kw">let</span> <span class="ident">suffix</span> <span class="op">=</span> <span class="ident">s</span>[<span class="ident">s</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">v</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="number">1</span>..].<span class="ident">to_owned</span>().<span class="ident">into_boxed_str</span>(); |
| (<span class="ident">b</span>, <span class="ident">suffix</span>) |
| } |
| |
| <span class="comment">// Returns (value, suffix).</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_lit_char</span>(<span class="kw-2">mut</span> <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> (<span class="ident">char</span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>) { |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>), <span class="string">b'\''</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">1</span>..]; |
| |
| <span class="kw">let</span> <span class="ident">ch</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>) { |
| <span class="string">b'\\'</span> => { |
| <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">1</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">2</span>..]; |
| <span class="kw">match</span> <span class="ident">b</span> { |
| <span class="string">b'x'</span> => { |
| <span class="kw">let</span> (<span class="ident">byte</span>, <span class="ident">rest</span>) <span class="op">=</span> <span class="ident">backslash_x</span>(<span class="ident">s</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="ident">rest</span>; |
| <span class="macro">assert!</span>(<span class="ident">byte</span> <span class="op"><</span><span class="op">=</span> <span class="number">0x80</span>, <span class="string">"Invalid \\x byte in string literal"</span>); |
| <span class="ident">char::from_u32</span>(<span class="ident">u32::from</span>(<span class="ident">byte</span>)).<span class="ident">unwrap</span>() |
| } |
| <span class="string">b'u'</span> => { |
| <span class="kw">let</span> (<span class="ident">chr</span>, <span class="ident">rest</span>) <span class="op">=</span> <span class="ident">backslash_u</span>(<span class="ident">s</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="ident">rest</span>; |
| <span class="ident">chr</span> |
| } |
| <span class="string">b'n'</span> => <span class="string">'\n'</span>, |
| <span class="string">b'r'</span> => <span class="string">'\r'</span>, |
| <span class="string">b't'</span> => <span class="string">'\t'</span>, |
| <span class="string">b'\\'</span> => <span class="string">'\\'</span>, |
| <span class="string">b'0'</span> => <span class="string">'\0'</span>, |
| <span class="string">b'\''</span> => <span class="string">'\''</span>, |
| <span class="string">b'"'</span> => <span class="string">'"'</span>, |
| <span class="ident">b</span> => <span class="macro">panic!</span>(<span class="string">"unexpected byte {:?} after \\ character in byte literal"</span>, <span class="ident">b</span>), |
| } |
| } |
| <span class="kw">_</span> => { |
| <span class="kw">let</span> <span class="ident">ch</span> <span class="op">=</span> <span class="ident">next_chr</span>(<span class="ident">s</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="ident">ch</span>.<span class="ident">len_utf8</span>()..]; |
| <span class="ident">ch</span> |
| } |
| }; |
| <span class="macro">assert_eq!</span>(<span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>), <span class="string">b'\''</span>); |
| <span class="kw">let</span> <span class="ident">suffix</span> <span class="op">=</span> <span class="ident">s</span>[<span class="number">1</span>..].<span class="ident">to_owned</span>().<span class="ident">into_boxed_str</span>(); |
| (<span class="ident">ch</span>, <span class="ident">suffix</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">backslash_x</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">S</span>) -> (<span class="ident">u8</span>, <span class="kw-2">&</span><span class="ident">S</span>) |
| <span class="kw">where</span> |
| <span class="ident">S</span>: <span class="ident">Index</span><span class="op"><</span><span class="ident">RangeFrom</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>, <span class="ident">Output</span> <span class="op">=</span> <span class="ident">S</span><span class="op">></span> <span class="op">+</span> <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">></span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span>, |
| { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ch</span> <span class="op">=</span> <span class="number">0</span>; |
| <span class="kw">let</span> <span class="ident">b0</span> <span class="op">=</span> <span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>); |
| <span class="kw">let</span> <span class="ident">b1</span> <span class="op">=</span> <span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">1</span>); |
| <span class="ident">ch</span> <span class="op">+</span><span class="op">=</span> <span class="number">0x10</span> |
| <span class="op">*</span> <span class="kw">match</span> <span class="ident">b0</span> { |
| <span class="string">b'0'</span>..<span class="op">=</span><span class="string">b'9'</span> => <span class="ident">b0</span> <span class="op">-</span> <span class="string">b'0'</span>, |
| <span class="string">b'a'</span>..<span class="op">=</span><span class="string">b'f'</span> => <span class="number">10</span> <span class="op">+</span> (<span class="ident">b0</span> <span class="op">-</span> <span class="string">b'a'</span>), |
| <span class="string">b'A'</span>..<span class="op">=</span><span class="string">b'F'</span> => <span class="number">10</span> <span class="op">+</span> (<span class="ident">b0</span> <span class="op">-</span> <span class="string">b'A'</span>), |
| <span class="kw">_</span> => <span class="macro">panic!</span>(<span class="string">"unexpected non-hex character after \\x"</span>), |
| }; |
| <span class="ident">ch</span> <span class="op">+</span><span class="op">=</span> <span class="kw">match</span> <span class="ident">b1</span> { |
| <span class="string">b'0'</span>..<span class="op">=</span><span class="string">b'9'</span> => <span class="ident">b1</span> <span class="op">-</span> <span class="string">b'0'</span>, |
| <span class="string">b'a'</span>..<span class="op">=</span><span class="string">b'f'</span> => <span class="number">10</span> <span class="op">+</span> (<span class="ident">b1</span> <span class="op">-</span> <span class="string">b'a'</span>), |
| <span class="string">b'A'</span>..<span class="op">=</span><span class="string">b'F'</span> => <span class="number">10</span> <span class="op">+</span> (<span class="ident">b1</span> <span class="op">-</span> <span class="string">b'A'</span>), |
| <span class="kw">_</span> => <span class="macro">panic!</span>(<span class="string">"unexpected non-hex character after \\x"</span>), |
| }; |
| (<span class="ident">ch</span>, <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">2</span>..]) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">backslash_u</span>(<span class="kw-2">mut</span> <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> (<span class="ident">char</span>, <span class="kw-2">&</span><span class="ident">str</span>) { |
| <span class="kw">if</span> <span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>) <span class="op">!</span><span class="op">=</span> <span class="string">b'{'</span> { |
| <span class="macro">panic!</span>(<span class="string">"{}"</span>, <span class="string">"expected { after \\u"</span>); |
| } |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">1</span>..]; |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ch</span> <span class="op">=</span> <span class="number">0</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">digits</span> <span class="op">=</span> <span class="number">0</span>; |
| <span class="kw">loop</span> { |
| <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>); |
| <span class="kw">let</span> <span class="ident">digit</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">b</span> { |
| <span class="string">b'0'</span>..<span class="op">=</span><span class="string">b'9'</span> => <span class="ident">b</span> <span class="op">-</span> <span class="string">b'0'</span>, |
| <span class="string">b'a'</span>..<span class="op">=</span><span class="string">b'f'</span> => <span class="number">10</span> <span class="op">+</span> <span class="ident">b</span> <span class="op">-</span> <span class="string">b'a'</span>, |
| <span class="string">b'A'</span>..<span class="op">=</span><span class="string">b'F'</span> => <span class="number">10</span> <span class="op">+</span> <span class="ident">b</span> <span class="op">-</span> <span class="string">b'A'</span>, |
| <span class="string">b'_'</span> <span class="kw">if</span> <span class="ident">digits</span> <span class="op">></span> <span class="number">0</span> => { |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">1</span>..]; |
| <span class="kw">continue</span>; |
| } |
| <span class="string">b'}'</span> <span class="kw">if</span> <span class="ident">digits</span> <span class="op">==</span> <span class="number">0</span> => <span class="macro">panic!</span>(<span class="string">"invalid empty unicode escape"</span>), |
| <span class="string">b'}'</span> => <span class="kw">break</span>, |
| <span class="kw">_</span> => <span class="macro">panic!</span>(<span class="string">"unexpected non-hex character after \\u"</span>), |
| }; |
| <span class="kw">if</span> <span class="ident">digits</span> <span class="op">==</span> <span class="number">6</span> { |
| <span class="macro">panic!</span>(<span class="string">"overlong unicode escape (must have at most 6 hex digits)"</span>); |
| } |
| <span class="ident">ch</span> <span class="kw-2">*</span><span class="op">=</span> <span class="number">0x10</span>; |
| <span class="ident">ch</span> <span class="op">+</span><span class="op">=</span> <span class="ident">u32::from</span>(<span class="ident">digit</span>); |
| <span class="ident">digits</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>; |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">1</span>..]; |
| } |
| <span class="macro">assert!</span>(<span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>) <span class="op">==</span> <span class="string">b'}'</span>); |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">1</span>..]; |
| |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">ch</span>) <span class="op">=</span> <span class="ident">char::from_u32</span>(<span class="ident">ch</span>) { |
| (<span class="ident">ch</span>, <span class="ident">s</span>) |
| } <span class="kw">else</span> { |
| <span class="macro">panic!</span>(<span class="string">"character code {:x} is not a valid unicode character"</span>, <span class="ident">ch</span>); |
| } |
| } |
| |
| <span class="comment">// Returns base 10 digits and suffix.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_lit_int</span>(<span class="kw-2">mut</span> <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>)<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">negative</span> <span class="op">=</span> <span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>) <span class="op">==</span> <span class="string">b'-'</span>; |
| <span class="kw">if</span> <span class="ident">negative</span> { |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">1</span>..]; |
| } |
| |
| <span class="kw">let</span> <span class="ident">base</span> <span class="op">=</span> <span class="kw">match</span> (<span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>), <span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">1</span>)) { |
| (<span class="string">b'0'</span>, <span class="string">b'x'</span>) => { |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">2</span>..]; |
| <span class="number">16</span> |
| } |
| (<span class="string">b'0'</span>, <span class="string">b'o'</span>) => { |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">2</span>..]; |
| <span class="number">8</span> |
| } |
| (<span class="string">b'0'</span>, <span class="string">b'b'</span>) => { |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">2</span>..]; |
| <span class="number">2</span> |
| } |
| (<span class="string">b'0'</span>..<span class="op">=</span><span class="string">b'9'</span>, <span class="kw">_</span>) => <span class="number">10</span>, |
| <span class="kw">_</span> => <span class="kw">return</span> <span class="prelude-val">None</span>, |
| }; |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">BigInt::new</span>(); |
| <span class="lifetime">'outer</span>: <span class="kw">loop</span> { |
| <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">byte</span>(<span class="ident">s</span>, <span class="number">0</span>); |
| <span class="kw">let</span> <span class="ident">digit</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">b</span> { |
| <span class="string">b'0'</span>..<span class="op">=</span><span class="string">b'9'</span> => <span class="ident">b</span> <span class="op">-</span> <span class="string">b'0'</span>, |
| <span class="string">b'a'</span>..<span class="op">=</span><span class="string">b'f'</span> <span class="kw">if</span> <span class="ident">base</span> <span class="op">></span> <span class="number">10</span> => <span class="ident">b</span> <span class="op">-</span> <span class="string">b'a'</span> <span class="op">+</span> <span class="number">10</span>, |
| <span class="string">b'A'</span>..<span class="op">=</span><span class="string">b'F'</span> <span class="kw">if</span> <span class="ident">base</span> <span class="op">></span> <span class="number">10</span> => <span class="ident">b</span> <span class="op">-</span> <span class="string">b'A'</span> <span class="op">+</span> <span class="number">10</span>, |
| <span class="string">b'_'</span> => { |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">1</span>..]; |
| <span class="kw">continue</span>; |
| } |
| <span class="comment">// If looking at a floating point literal, we don't want to</span> |
| <span class="comment">// consider it an integer.</span> |
| <span class="string">b'.'</span> <span class="kw">if</span> <span class="ident">base</span> <span class="op">==</span> <span class="number">10</span> => <span class="kw">return</span> <span class="prelude-val">None</span>, |
| <span class="string">b'e'</span> <span class="op">|</span> <span class="string">b'E'</span> <span class="kw">if</span> <span class="ident">base</span> <span class="op">==</span> <span class="number">10</span> => { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">has_exp</span> <span class="op">=</span> <span class="bool-val">false</span>; |
| <span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">b</span>) <span class="kw">in</span> <span class="ident">s</span>[<span class="number">1</span>..].<span class="ident">bytes</span>().<span class="ident">enumerate</span>() { |
| <span class="kw">match</span> <span class="ident">b</span> { |
| <span class="string">b'_'</span> => {} |
| <span class="string">b'-'</span> <span class="op">|</span> <span class="string">b'+'</span> => <span class="kw">return</span> <span class="prelude-val">None</span>, |
| <span class="string">b'0'</span>..<span class="op">=</span><span class="string">b'9'</span> => <span class="ident">has_exp</span> <span class="op">=</span> <span class="bool-val">true</span>, |
| <span class="kw">_</span> => { |
| <span class="kw">let</span> <span class="ident">suffix</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">1</span> <span class="op">+</span> <span class="ident">i</span>..]; |
| <span class="kw">if</span> <span class="ident">has_exp</span> <span class="op">&&</span> <span class="ident"><span class="kw">crate</span>::ident::xid_ok</span>(<span class="ident">suffix</span>) { |
| <span class="kw">return</span> <span class="prelude-val">None</span>; |
| } <span class="kw">else</span> { |
| <span class="kw">break</span> <span class="lifetime">'outer</span>; |
| } |
| } |
| } |
| } |
| <span class="kw">if</span> <span class="ident">has_exp</span> { |
| <span class="kw">return</span> <span class="prelude-val">None</span>; |
| } <span class="kw">else</span> { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="kw">_</span> => <span class="kw">break</span>, |
| }; |
| |
| <span class="kw">if</span> <span class="ident">digit</span> <span class="op">></span><span class="op">=</span> <span class="ident">base</span> { |
| <span class="kw">return</span> <span class="prelude-val">None</span>; |
| } |
| |
| <span class="ident">value</span> <span class="kw-2">*</span><span class="op">=</span> <span class="ident">base</span>; |
| <span class="ident">value</span> <span class="op">+</span><span class="op">=</span> <span class="ident">digit</span>; |
| <span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">1</span>..]; |
| } |
| |
| <span class="kw">let</span> <span class="ident">suffix</span> <span class="op">=</span> <span class="ident">s</span>; |
| <span class="kw">if</span> <span class="ident">suffix</span>.<span class="ident">is_empty</span>() <span class="op">|</span><span class="op">|</span> <span class="ident"><span class="kw">crate</span>::ident::xid_ok</span>(<span class="ident">suffix</span>) { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">repr</span> <span class="op">=</span> <span class="ident">value</span>.<span class="ident">to_string</span>(); |
| <span class="kw">if</span> <span class="ident">negative</span> { |
| <span class="ident">repr</span>.<span class="ident">insert</span>(<span class="number">0</span>, <span class="string">'-'</span>); |
| } |
| <span class="prelude-val">Some</span>((<span class="ident">repr</span>.<span class="ident">into_boxed_str</span>(), <span class="ident">suffix</span>.<span class="ident">to_owned</span>().<span class="ident">into_boxed_str</span>())) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">None</span> |
| } |
| } |
| |
| <span class="comment">// Returns base 10 digits and suffix.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_lit_float</span>(<span class="ident">input</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>)<span class="op">></span> { |
| <span class="comment">// Rust's floating point literals are very similar to the ones parsed by</span> |
| <span class="comment">// the standard library, except that rust's literals can contain</span> |
| <span class="comment">// ignorable underscores. Let's remove those underscores.</span> |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">to_owned</span>().<span class="ident">into_bytes</span>(); |
| |
| <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">bytes</span>.<span class="ident">get</span>(<span class="number">0</span>)<span class="question-mark">?</span> <span class="op">==</span> <span class="string">b'-'</span>) <span class="kw">as</span> <span class="ident">usize</span>; |
| <span class="kw">match</span> <span class="ident">bytes</span>.<span class="ident">get</span>(<span class="ident">start</span>)<span class="question-mark">?</span> { |
| <span class="string">b'0'</span>..<span class="op">=</span><span class="string">b'9'</span> => {} |
| <span class="kw">_</span> => <span class="kw">return</span> <span class="prelude-val">None</span>, |
| } |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">read</span> <span class="op">=</span> <span class="ident">start</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">write</span> <span class="op">=</span> <span class="ident">start</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">has_dot</span> <span class="op">=</span> <span class="bool-val">false</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">has_e</span> <span class="op">=</span> <span class="bool-val">false</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">has_sign</span> <span class="op">=</span> <span class="bool-val">false</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">has_exponent</span> <span class="op">=</span> <span class="bool-val">false</span>; |
| <span class="kw">while</span> <span class="ident">read</span> <span class="op"><</span> <span class="ident">bytes</span>.<span class="ident">len</span>() { |
| <span class="kw">match</span> <span class="ident">bytes</span>[<span class="ident">read</span>] { |
| <span class="string">b'_'</span> => { |
| <span class="comment">// Don't increase write</span> |
| <span class="ident">read</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>; |
| <span class="kw">continue</span>; |
| } |
| <span class="string">b'0'</span>..<span class="op">=</span><span class="string">b'9'</span> => { |
| <span class="kw">if</span> <span class="ident">has_e</span> { |
| <span class="ident">has_exponent</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| } |
| <span class="ident">bytes</span>[<span class="ident">write</span>] <span class="op">=</span> <span class="ident">bytes</span>[<span class="ident">read</span>]; |
| } |
| <span class="string">b'.'</span> => { |
| <span class="kw">if</span> <span class="ident">has_e</span> <span class="op">|</span><span class="op">|</span> <span class="ident">has_dot</span> { |
| <span class="kw">return</span> <span class="prelude-val">None</span>; |
| } |
| <span class="ident">has_dot</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| <span class="ident">bytes</span>[<span class="ident">write</span>] <span class="op">=</span> <span class="string">b'.'</span>; |
| } |
| <span class="string">b'e'</span> <span class="op">|</span> <span class="string">b'E'</span> => { |
| <span class="kw">match</span> <span class="ident">bytes</span>[<span class="ident">read</span> <span class="op">+</span> <span class="number">1</span>..] |
| .<span class="ident">iter</span>() |
| .<span class="ident">find</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">b</span> <span class="op">!</span><span class="op">=</span> <span class="string">b'_'</span>) |
| .<span class="ident">unwrap_or</span>(<span class="kw-2">&</span><span class="string">b'\0'</span>) |
| { |
| <span class="string">b'-'</span> <span class="op">|</span> <span class="string">b'+'</span> <span class="op">|</span> <span class="string">b'0'</span>..<span class="op">=</span><span class="string">b'9'</span> => {} |
| <span class="kw">_</span> => <span class="kw">break</span>, |
| } |
| <span class="kw">if</span> <span class="ident">has_e</span> { |
| <span class="kw">if</span> <span class="ident">has_exponent</span> { |
| <span class="kw">break</span>; |
| } <span class="kw">else</span> { |
| <span class="kw">return</span> <span class="prelude-val">None</span>; |
| } |
| } |
| <span class="ident">has_e</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| <span class="ident">bytes</span>[<span class="ident">write</span>] <span class="op">=</span> <span class="string">b'e'</span>; |
| } |
| <span class="string">b'-'</span> <span class="op">|</span> <span class="string">b'+'</span> => { |
| <span class="kw">if</span> <span class="ident">has_sign</span> <span class="op">|</span><span class="op">|</span> <span class="ident">has_exponent</span> <span class="op">|</span><span class="op">|</span> <span class="op">!</span><span class="ident">has_e</span> { |
| <span class="kw">return</span> <span class="prelude-val">None</span>; |
| } |
| <span class="ident">has_sign</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| <span class="kw">if</span> <span class="ident">bytes</span>[<span class="ident">read</span>] <span class="op">==</span> <span class="string">b'-'</span> { |
| <span class="ident">bytes</span>[<span class="ident">write</span>] <span class="op">=</span> <span class="ident">bytes</span>[<span class="ident">read</span>]; |
| } <span class="kw">else</span> { |
| <span class="comment">// Omit '+'</span> |
| <span class="ident">read</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>; |
| <span class="kw">continue</span>; |
| } |
| } |
| <span class="kw">_</span> => <span class="kw">break</span>, |
| } |
| <span class="ident">read</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>; |
| <span class="ident">write</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>; |
| } |
| |
| <span class="kw">if</span> <span class="ident">has_e</span> <span class="op">&&</span> <span class="op">!</span><span class="ident">has_exponent</span> { |
| <span class="kw">return</span> <span class="prelude-val">None</span>; |
| } |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">digits</span> <span class="op">=</span> <span class="ident">String::from_utf8</span>(<span class="ident">bytes</span>).<span class="ident">unwrap</span>(); |
| <span class="kw">let</span> <span class="ident">suffix</span> <span class="op">=</span> <span class="ident">digits</span>.<span class="ident">split_off</span>(<span class="ident">read</span>); |
| <span class="ident">digits</span>.<span class="ident">truncate</span>(<span class="ident">write</span>); |
| <span class="kw">if</span> <span class="ident">suffix</span>.<span class="ident">is_empty</span>() <span class="op">|</span><span class="op">|</span> <span class="ident"><span class="kw">crate</span>::ident::xid_ok</span>(<span class="kw-2">&</span><span class="ident">suffix</span>) { |
| <span class="prelude-val">Some</span>((<span class="ident">digits</span>.<span class="ident">into_boxed_str</span>(), <span class="ident">suffix</span>.<span class="ident">into_boxed_str</span>())) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">None</span> |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::unnecessary_wraps</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_literal</span>(<span class="ident">repr</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">digits</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">suffix</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Literal</span><span class="op">></span> { |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">syn_no_negative_literal_parse</span>)]</span> |
| { |
| <span class="comment">// Rustc older than https://github.com/rust-lang/rust/pull/87262.</span> |
| <span class="kw">if</span> <span class="ident">repr</span>.<span class="ident">starts_with</span>(<span class="string">'-'</span>) { |
| <span class="kw">let</span> <span class="ident">f64_parse_finite</span> <span class="op">=</span> <span class="op">|</span><span class="op">|</span> <span class="ident">digits</span>.<span class="ident">parse</span>().<span class="ident">ok</span>().<span class="ident">filter</span>(<span class="op">|</span><span class="ident">x</span>: <span class="kw-2">&</span><span class="ident">f64</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">is_finite</span>()); |
| <span class="kw">let</span> <span class="ident">f32_parse_finite</span> <span class="op">=</span> <span class="op">|</span><span class="op">|</span> <span class="ident">digits</span>.<span class="ident">parse</span>().<span class="ident">ok</span>().<span class="ident">filter</span>(<span class="op">|</span><span class="ident">x</span>: <span class="kw-2">&</span><span class="ident">f32</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">is_finite</span>()); |
| <span class="kw">return</span> <span class="kw">if</span> <span class="ident">suffix</span> <span class="op">==</span> <span class="string">"f64"</span> { |
| <span class="ident">f64_parse_finite</span>().<span class="ident">map</span>(<span class="ident">Literal::f64_suffixed</span>) |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">suffix</span> <span class="op">==</span> <span class="string">"f32"</span> { |
| <span class="ident">f32_parse_finite</span>().<span class="ident">map</span>(<span class="ident">Literal::f32_suffixed</span>) |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">suffix</span> <span class="op">==</span> <span class="string">"i64"</span> { |
| <span class="ident">digits</span>.<span class="ident">parse</span>().<span class="ident">ok</span>().<span class="ident">map</span>(<span class="ident">Literal::i64_suffixed</span>) |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">suffix</span> <span class="op">==</span> <span class="string">"i32"</span> { |
| <span class="ident">digits</span>.<span class="ident">parse</span>().<span class="ident">ok</span>().<span class="ident">map</span>(<span class="ident">Literal::i32_suffixed</span>) |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">suffix</span> <span class="op">==</span> <span class="string">"i16"</span> { |
| <span class="ident">digits</span>.<span class="ident">parse</span>().<span class="ident">ok</span>().<span class="ident">map</span>(<span class="ident">Literal::i16_suffixed</span>) |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">suffix</span> <span class="op">==</span> <span class="string">"i8"</span> { |
| <span class="ident">digits</span>.<span class="ident">parse</span>().<span class="ident">ok</span>().<span class="ident">map</span>(<span class="ident">Literal::i8_suffixed</span>) |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="op">!</span><span class="ident">suffix</span>.<span class="ident">is_empty</span>() { |
| <span class="prelude-val">None</span> |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">digits</span>.<span class="ident">contains</span>(<span class="string">'.'</span>) { |
| <span class="ident">f64_parse_finite</span>().<span class="ident">map</span>(<span class="ident">Literal::f64_unsuffixed</span>) |
| } <span class="kw">else</span> { |
| <span class="ident">digits</span>.<span class="ident">parse</span>().<span class="ident">ok</span>().<span class="ident">map</span>(<span class="ident">Literal::i64_unsuffixed</span>) |
| }; |
| } |
| } |
| <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">digits</span>; |
| <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">suffix</span>; |
| <span class="prelude-val">Some</span>(<span class="ident">repr</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">Literal</span><span class="op">></span>().<span class="ident">unwrap</span>()) |
| } |
| } |
| </code></pre></div> |
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