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| </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>::buffer::Cursor</span>; |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::thread::ThreadBound</span>; |
| <span class="kw">use</span> <span class="ident">proc_macro2</span>::{ |
| <span class="ident">Delimiter</span>, <span class="ident">Group</span>, <span class="ident">Ident</span>, <span class="ident">LexError</span>, <span class="ident">Literal</span>, <span class="ident">Punct</span>, <span class="ident">Spacing</span>, <span class="ident">Span</span>, <span class="ident">TokenStream</span>, <span class="ident">TokenTree</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">use</span> <span class="ident">quote::ToTokens</span>; |
| <span class="kw">use</span> <span class="ident">std::fmt</span>::{<span class="self">self</span>, <span class="ident">Debug</span>, <span class="ident">Display</span>}; |
| <span class="kw">use</span> <span class="ident">std::iter::FromIterator</span>; |
| <span class="kw">use</span> <span class="ident">std::slice</span>; |
| <span class="kw">use</span> <span class="ident">std::vec</span>; |
| |
| <span class="doccomment">/// The result of a Syn parser.</span> |
| <span class="kw">pub</span> <span class="kw">type</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="op">=</span> <span class="ident">std::result::Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">Error</span><span class="op">></span>; |
| |
| <span class="doccomment">/// Error returned when a Syn parser cannot parse the input tokens.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Error reporting in proc macros</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The correct way to report errors back to the compiler from a procedural</span> |
| <span class="doccomment">/// macro is by emitting an appropriately spanned invocation of</span> |
| <span class="doccomment">/// [`compile_error!`] in the generated code. This produces a better diagnostic</span> |
| <span class="doccomment">/// message than simply panicking the macro.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`compile_error!`]: std::compile_error!</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// When parsing macro input, the [`parse_macro_input!`] macro handles the</span> |
| <span class="doccomment">/// conversion to `compile_error!` automatically.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// # extern crate proc_macro;</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// use proc_macro::TokenStream;</span> |
| <span class="doccomment">/// use syn::{parse_macro_input, AttributeArgs, ItemFn};</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # const IGNORE: &str = stringify! {</span> |
| <span class="doccomment">/// #[proc_macro_attribute]</span> |
| <span class="doccomment">/// # };</span> |
| <span class="doccomment">/// pub fn my_attr(args: TokenStream, input: TokenStream) -> TokenStream {</span> |
| <span class="doccomment">/// let args = parse_macro_input!(args as AttributeArgs);</span> |
| <span class="doccomment">/// let input = parse_macro_input!(input as ItemFn);</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// /* ... */</span> |
| <span class="doccomment">/// # TokenStream::new()</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// For errors that arise later than the initial parsing stage, the</span> |
| <span class="doccomment">/// [`.to_compile_error()`] or [`.into_compile_error()`] methods can be used to</span> |
| <span class="doccomment">/// perform an explicit conversion to `compile_error!`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`.to_compile_error()`]: Error::to_compile_error</span> |
| <span class="doccomment">/// [`.into_compile_error()`]: Error::into_compile_error</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// # extern crate proc_macro;</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// # use proc_macro::TokenStream;</span> |
| <span class="doccomment">/// # use syn::{parse_macro_input, DeriveInput};</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// # const IGNORE: &str = stringify! {</span> |
| <span class="doccomment">/// #[proc_macro_derive(MyDerive)]</span> |
| <span class="doccomment">/// # };</span> |
| <span class="doccomment">/// pub fn my_derive(input: TokenStream) -> TokenStream {</span> |
| <span class="doccomment">/// let input = parse_macro_input!(input as DeriveInput);</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// // fn(DeriveInput) -> syn::Result<proc_macro2::TokenStream></span> |
| <span class="doccomment">/// expand::my_derive(input)</span> |
| <span class="doccomment">/// .unwrap_or_else(syn::Error::into_compile_error)</span> |
| <span class="doccomment">/// .into()</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// # mod expand {</span> |
| <span class="doccomment">/// # use proc_macro2::TokenStream;</span> |
| <span class="doccomment">/// # use syn::{DeriveInput, Result};</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// # pub fn my_derive(input: DeriveInput) -> Result<TokenStream> {</span> |
| <span class="doccomment">/// # unimplemented!()</span> |
| <span class="doccomment">/// # }</span> |
| <span class="doccomment">/// # }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Error</span> { |
| <span class="ident">messages</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">ErrorMessage</span><span class="op">></span>, |
| } |
| |
| <span class="kw">struct</span> <span class="ident">ErrorMessage</span> { |
| <span class="comment">// Span is implemented as an index into a thread-local interner to keep the</span> |
| <span class="comment">// size small. It is not safe to access from a different thread. We want</span> |
| <span class="comment">// errors to be Send and Sync to play nicely with the Failure crate, so pin</span> |
| <span class="comment">// the span we're given to its original thread and assume it is</span> |
| <span class="comment">// Span::call_site if accessed from any other thread.</span> |
| <span class="ident">start_span</span>: <span class="ident">ThreadBound</span><span class="op"><</span><span class="ident">Span</span><span class="op">></span>, |
| <span class="ident">end_span</span>: <span class="ident">ThreadBound</span><span class="op"><</span><span class="ident">Span</span><span class="op">></span>, |
| <span class="ident">message</span>: <span class="ident">String</span>, |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> |
| <span class="kw">struct</span> <span class="ident">_Test</span> |
| <span class="kw">where</span> |
| <span class="ident">Error</span>: <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span>; |
| |
| <span class="kw">impl</span> <span class="ident">Error</span> { |
| <span class="doccomment">/// Usually the [`ParseStream::error`] method will be used instead, which</span> |
| <span class="doccomment">/// automatically uses the correct span from the current position of the</span> |
| <span class="doccomment">/// parse stream.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Use `Error::new` when the error needs to be triggered on some span other</span> |
| <span class="doccomment">/// than where the parse stream is currently positioned.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`ParseStream::error`]: crate::parse::ParseBuffer::error</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// use syn::{Error, Ident, LitStr, Result, Token};</span> |
| <span class="doccomment">/// use syn::parse::ParseStream;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// // Parses input that looks like `name = "string"` where the key must be</span> |
| <span class="doccomment">/// // the identifier `name` and the value may be any string literal.</span> |
| <span class="doccomment">/// // Returns the string literal.</span> |
| <span class="doccomment">/// fn parse_name(input: ParseStream) -> Result<LitStr> {</span> |
| <span class="doccomment">/// let name_token: Ident = input.parse()?;</span> |
| <span class="doccomment">/// if name_token != "name" {</span> |
| <span class="doccomment">/// // Trigger an error not on the current position of the stream,</span> |
| <span class="doccomment">/// // but on the position of the unexpected identifier.</span> |
| <span class="doccomment">/// return Err(Error::new(name_token.span(), "expected `name`"));</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// input.parse::<Token![=]>()?;</span> |
| <span class="doccomment">/// let s: LitStr = input.parse()?;</span> |
| <span class="doccomment">/// Ok(s)</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Display</span><span class="op">></span>(<span class="ident">span</span>: <span class="ident">Span</span>, <span class="ident">message</span>: <span class="ident">T</span>) -> <span class="self">Self</span> { |
| <span class="ident">Error</span> { |
| <span class="ident">messages</span>: <span class="macro">vec!</span>[<span class="ident">ErrorMessage</span> { |
| <span class="ident">start_span</span>: <span class="ident">ThreadBound::new</span>(<span class="ident">span</span>), |
| <span class="ident">end_span</span>: <span class="ident">ThreadBound::new</span>(<span class="ident">span</span>), |
| <span class="ident">message</span>: <span class="ident">message</span>.<span class="ident">to_string</span>(), |
| }], |
| } |
| } |
| |
| <span class="doccomment">/// Creates an error with the specified message spanning the given syntax</span> |
| <span class="doccomment">/// tree node.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Unlike the `Error::new` constructor, this constructor takes an argument</span> |
| <span class="doccomment">/// `tokens` which is a syntax tree node. This allows the resulting `Error`</span> |
| <span class="doccomment">/// to attempt to span all tokens inside of `tokens`. While you would</span> |
| <span class="doccomment">/// typically be able to use the `Spanned` trait with the above `Error::new`</span> |
| <span class="doccomment">/// constructor, implementation limitations today mean that</span> |
| <span class="doccomment">/// `Error::new_spanned` may provide a higher-quality error message on</span> |
| <span class="doccomment">/// stable Rust.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// When in doubt it's recommended to stick to `Error::new` (or</span> |
| <span class="doccomment">/// `ParseStream::error`)!</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">pub</span> <span class="kw">fn</span> <span class="ident">new_spanned</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">ToTokens</span>, <span class="ident">U</span>: <span class="ident">Display</span><span class="op">></span>(<span class="ident">tokens</span>: <span class="ident">T</span>, <span class="ident">message</span>: <span class="ident">U</span>) -> <span class="self">Self</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">tokens</span>.<span class="ident">into_token_stream</span>().<span class="ident">into_iter</span>(); |
| <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">map_or_else</span>(<span class="ident">Span::call_site</span>, <span class="op">|</span><span class="ident">t</span><span class="op">|</span> <span class="ident">t</span>.<span class="ident">span</span>()); |
| <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="ident">iter</span>.<span class="ident">last</span>().<span class="ident">map_or</span>(<span class="ident">start</span>, <span class="op">|</span><span class="ident">t</span><span class="op">|</span> <span class="ident">t</span>.<span class="ident">span</span>()); |
| <span class="ident">Error</span> { |
| <span class="ident">messages</span>: <span class="macro">vec!</span>[<span class="ident">ErrorMessage</span> { |
| <span class="ident">start_span</span>: <span class="ident">ThreadBound::new</span>(<span class="ident">start</span>), |
| <span class="ident">end_span</span>: <span class="ident">ThreadBound::new</span>(<span class="ident">end</span>), |
| <span class="ident">message</span>: <span class="ident">message</span>.<span class="ident">to_string</span>(), |
| }], |
| } |
| } |
| |
| <span class="doccomment">/// The source location of the error.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Spans are not thread-safe so this function returns `Span::call_site()`</span> |
| <span class="doccomment">/// if called from a different thread than the one on which the `Error` was</span> |
| <span class="doccomment">/// originally created.</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">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">messages</span>[<span class="number">0</span>].<span class="ident">start_span</span>.<span class="ident">get</span>() { |
| <span class="prelude-val">Some</span>(<span class="ident">span</span>) => <span class="kw-2">*</span><span class="ident">span</span>, |
| <span class="prelude-val">None</span> => <span class="kw">return</span> <span class="ident">Span::call_site</span>(), |
| }; |
| <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">messages</span>[<span class="number">0</span>].<span class="ident">end_span</span>.<span class="ident">get</span>() { |
| <span class="prelude-val">Some</span>(<span class="ident">span</span>) => <span class="kw-2">*</span><span class="ident">span</span>, |
| <span class="prelude-val">None</span> => <span class="kw">return</span> <span class="ident">Span::call_site</span>(), |
| }; |
| <span class="ident">start</span>.<span class="ident">join</span>(<span class="ident">end</span>).<span class="ident">unwrap_or</span>(<span class="ident">start</span>) |
| } |
| |
| <span class="doccomment">/// Render the error as an invocation of [`compile_error!`].</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The [`parse_macro_input!`] macro provides a convenient way to invoke</span> |
| <span class="doccomment">/// this method correctly in a procedural macro.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`compile_error!`]: std::compile_error!</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_compile_error</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">TokenStream</span> { |
| <span class="self">self</span>.<span class="ident">messages</span> |
| .<span class="ident">iter</span>() |
| .<span class="ident">map</span>(<span class="ident">ErrorMessage::to_compile_error</span>) |
| .<span class="ident">collect</span>() |
| } |
| |
| <span class="doccomment">/// Render the error as an invocation of [`compile_error!`].</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`compile_error!`]: std::compile_error!</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// # extern crate proc_macro;</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// use proc_macro::TokenStream;</span> |
| <span class="doccomment">/// use syn::{parse_macro_input, DeriveInput, Error};</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # const _: &str = stringify! {</span> |
| <span class="doccomment">/// #[proc_macro_derive(MyTrait)]</span> |
| <span class="doccomment">/// # };</span> |
| <span class="doccomment">/// pub fn derive_my_trait(input: TokenStream) -> TokenStream {</span> |
| <span class="doccomment">/// let input = parse_macro_input!(input as DeriveInput);</span> |
| <span class="doccomment">/// my_trait::expand(input)</span> |
| <span class="doccomment">/// .unwrap_or_else(Error::into_compile_error)</span> |
| <span class="doccomment">/// .into()</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// mod my_trait {</span> |
| <span class="doccomment">/// use proc_macro2::TokenStream;</span> |
| <span class="doccomment">/// use syn::{DeriveInput, Result};</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// pub(crate) fn expand(input: DeriveInput) -> Result<TokenStream> {</span> |
| <span class="doccomment">/// /* ... */</span> |
| <span class="doccomment">/// # unimplemented!()</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">into_compile_error</span>(<span class="self">self</span>) -> <span class="ident">TokenStream</span> { |
| <span class="self">self</span>.<span class="ident">to_compile_error</span>() |
| } |
| |
| <span class="doccomment">/// Add another error message to self such that when `to_compile_error()` is</span> |
| <span class="doccomment">/// called, both errors will be emitted together.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">combine</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">another</span>: <span class="ident">Error</span>) { |
| <span class="self">self</span>.<span class="ident">messages</span>.<span class="ident">extend</span>(<span class="ident">another</span>.<span class="ident">messages</span>); |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">ErrorMessage</span> { |
| <span class="kw">fn</span> <span class="ident">to_compile_error</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">TokenStream</span> { |
| <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="self">self</span> |
| .<span class="ident">start_span</span> |
| .<span class="ident">get</span>() |
| .<span class="ident">cloned</span>() |
| .<span class="ident">unwrap_or_else</span>(<span class="ident">Span::call_site</span>); |
| <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">end_span</span>.<span class="ident">get</span>().<span class="ident">cloned</span>().<span class="ident">unwrap_or_else</span>(<span class="ident">Span::call_site</span>); |
| |
| <span class="comment">// compile_error!($message)</span> |
| <span class="ident">TokenStream::from_iter</span>(<span class="macro">vec!</span>[ |
| <span class="ident">TokenTree::Ident</span>(<span class="ident">Ident::new</span>(<span class="string">"compile_error"</span>, <span class="ident">start</span>)), |
| <span class="ident">TokenTree::Punct</span>({ |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">punct</span> <span class="op">=</span> <span class="ident">Punct::new</span>(<span class="string">'!'</span>, <span class="ident">Spacing::Alone</span>); |
| <span class="ident">punct</span>.<span class="ident">set_span</span>(<span class="ident">start</span>); |
| <span class="ident">punct</span> |
| }), |
| <span class="ident">TokenTree::Group</span>({ |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">group</span> <span class="op">=</span> <span class="ident">Group::new</span>(<span class="ident">Delimiter::Brace</span>, { |
| <span class="ident">TokenStream::from_iter</span>(<span class="macro">vec!</span>[<span class="ident">TokenTree::Literal</span>({ |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">string</span> <span class="op">=</span> <span class="ident">Literal::string</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">message</span>); |
| <span class="ident">string</span>.<span class="ident">set_span</span>(<span class="ident">end</span>); |
| <span class="ident">string</span> |
| })]) |
| }); |
| <span class="ident">group</span>.<span class="ident">set_span</span>(<span class="ident">end</span>); |
| <span class="ident">group</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">fn</span> <span class="ident">new_at</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Display</span><span class="op">></span>(<span class="ident">scope</span>: <span class="ident">Span</span>, <span class="ident">cursor</span>: <span class="ident">Cursor</span>, <span class="ident">message</span>: <span class="ident">T</span>) -> <span class="ident">Error</span> { |
| <span class="kw">if</span> <span class="ident">cursor</span>.<span class="ident">eof</span>() { |
| <span class="ident">Error::new</span>(<span class="ident">scope</span>, <span class="macro">format!</span>(<span class="string">"unexpected end of input, {}"</span>, <span class="ident">message</span>)) |
| } <span class="kw">else</span> { |
| <span class="kw">let</span> <span class="ident">span</span> <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::buffer::open_span_of_group</span>(<span class="ident">cursor</span>); |
| <span class="ident">Error::new</span>(<span class="ident">span</span>, <span class="ident">message</span>) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>, <span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>)))]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new2</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Display</span><span class="op">></span>(<span class="ident">start</span>: <span class="ident">Span</span>, <span class="ident">end</span>: <span class="ident">Span</span>, <span class="ident">message</span>: <span class="ident">T</span>) -> <span class="ident">Error</span> { |
| <span class="ident">Error</span> { |
| <span class="ident">messages</span>: <span class="macro">vec!</span>[<span class="ident">ErrorMessage</span> { |
| <span class="ident">start_span</span>: <span class="ident">ThreadBound::new</span>(<span class="ident">start</span>), |
| <span class="ident">end_span</span>: <span class="ident">ThreadBound::new</span>(<span class="ident">end</span>), |
| <span class="ident">message</span>: <span class="ident">message</span>.<span class="ident">to_string</span>(), |
| }], |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Error</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="kw">if</span> <span class="self">self</span>.<span class="ident">messages</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> { |
| <span class="ident">formatter</span> |
| .<span class="ident">debug_tuple</span>(<span class="string">"Error"</span>) |
| .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">messages</span>[<span class="number">0</span>]) |
| .<span class="ident">finish</span>() |
| } <span class="kw">else</span> { |
| <span class="ident">formatter</span> |
| .<span class="ident">debug_tuple</span>(<span class="string">"Error"</span>) |
| .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">messages</span>) |
| .<span class="ident">finish</span>() |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">ErrorMessage</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">Debug::fmt</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">message</span>, <span class="ident">formatter</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Error</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">write_str</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">messages</span>[<span class="number">0</span>].<span class="ident">message</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Error</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">Error</span> { |
| <span class="ident">messages</span>: <span class="self">self</span>.<span class="ident">messages</span>.<span class="ident">clone</span>(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">ErrorMessage</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="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="self">self</span> |
| .<span class="ident">start_span</span> |
| .<span class="ident">get</span>() |
| .<span class="ident">cloned</span>() |
| .<span class="ident">unwrap_or_else</span>(<span class="ident">Span::call_site</span>); |
| <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">end_span</span>.<span class="ident">get</span>().<span class="ident">cloned</span>().<span class="ident">unwrap_or_else</span>(<span class="ident">Span::call_site</span>); |
| <span class="ident">ErrorMessage</span> { |
| <span class="ident">start_span</span>: <span class="ident">ThreadBound::new</span>(<span class="ident">start</span>), |
| <span class="ident">end_span</span>: <span class="ident">ThreadBound::new</span>(<span class="ident">end</span>), |
| <span class="ident">message</span>: <span class="self">self</span>.<span class="ident">message</span>.<span class="ident">clone</span>(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">std::error::Error</span> <span class="kw">for</span> <span class="ident">Error</span> {} |
| |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">LexError</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Error</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">LexError</span>) -> <span class="self">Self</span> { |
| <span class="ident">Error::new</span>(<span class="ident">err</span>.<span class="ident">span</span>(), <span class="string">"lex error"</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">Error</span> { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Error</span>; |
| <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IntoIter</span>; |
| |
| <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) -> <span class="ident"><span class="self">Self</span>::IntoIter</span> { |
| <span class="ident">IntoIter</span> { |
| <span class="ident">messages</span>: <span class="self">self</span>.<span class="ident">messages</span>.<span class="ident">into_iter</span>(), |
| } |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IntoIter</span> { |
| <span class="ident">messages</span>: <span class="ident">vec::IntoIter</span><span class="op"><</span><span class="ident">ErrorMessage</span><span class="op">></span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span> { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Error</span>; |
| |
| <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&mut</span> <span class="self">self</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">></span> { |
| <span class="prelude-val">Some</span>(<span class="ident">Error</span> { |
| <span class="ident">messages</span>: <span class="macro">vec!</span>[<span class="self">self</span>.<span class="ident">messages</span>.<span class="ident">next</span>()<span class="question-mark">?</span>], |
| }) |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Error</span> { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Error</span>; |
| <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>; |
| |
| <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) -> <span class="ident"><span class="self">Self</span>::IntoIter</span> { |
| <span class="ident">Iter</span> { |
| <span class="ident">messages</span>: <span class="self">self</span>.<span class="ident">messages</span>.<span class="ident">iter</span>(), |
| } |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="ident">messages</span>: <span class="ident">slice::Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">ErrorMessage</span><span class="op">></span>, |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Error</span>; |
| |
| <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&mut</span> <span class="self">self</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">></span> { |
| <span class="prelude-val">Some</span>(<span class="ident">Error</span> { |
| <span class="ident">messages</span>: <span class="macro">vec!</span>[<span class="self">self</span>.<span class="ident">messages</span>.<span class="ident">next</span>()<span class="question-mark">?</span>.<span class="ident">clone</span>()], |
| }) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Extend</span><span class="op"><</span><span class="ident">Error</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Error</span> { |
| <span class="kw">fn</span> <span class="ident">extend</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">Error</span><span class="op">></span><span class="op">></span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">T</span>) { |
| <span class="kw">for</span> <span class="ident">err</span> <span class="kw">in</span> <span class="ident">iter</span> { |
| <span class="self">self</span>.<span class="ident">combine</span>(<span class="ident">err</span>); |
| } |
| } |
| } |
| </code></pre></div> |
| </section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="syn" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.60.0-nightly (1bd4fdc94 2022-01-12)" ></div> |
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