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| </pre><pre class="rust"><code><span class="doccomment">//! Extensions to the parsing API with niche applicability.</span> |
| |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// Extensions to the `ParseStream` API to support speculative parsing.</span> |
| <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Speculative</span> { |
| <span class="doccomment">/// Advance this parse stream to the position of a forked parse stream.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is the opposite operation to [`ParseStream::fork`]. You can fork a</span> |
| <span class="doccomment">/// parse stream, perform some speculative parsing, then join the original</span> |
| <span class="doccomment">/// stream to the fork to "commit" the parsing from the fork to the main</span> |
| <span class="doccomment">/// stream.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If you can avoid doing this, you should, as it limits the ability to</span> |
| <span class="doccomment">/// generate useful errors. That said, it is often the only way to parse</span> |
| <span class="doccomment">/// syntax of the form `A* B*` for arbitrary syntax `A` and `B`. The problem</span> |
| <span class="doccomment">/// is that when the fork fails to parse an `A`, it's impossible to tell</span> |
| <span class="doccomment">/// whether that was because of a syntax error and the user meant to provide</span> |
| <span class="doccomment">/// an `A`, or that the `A`s are finished and it's time to start parsing</span> |
| <span class="doccomment">/// `B`s. Use with care.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Also note that if `A` is a subset of `B`, `A* B*` can be parsed by</span> |
| <span class="doccomment">/// parsing `B*` and removing the leading members of `A` from the</span> |
| <span class="doccomment">/// repetition, bypassing the need to involve the downsides associated with</span> |
| <span class="doccomment">/// speculative parsing.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`ParseStream::fork`]: ParseBuffer::fork</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// There has been chatter about the possibility of making the colons in the</span> |
| <span class="doccomment">/// turbofish syntax like `path::to::<T>` no longer required by accepting</span> |
| <span class="doccomment">/// `path::to<T>` in expression position. Specifically, according to [RFC</span> |
| <span class="doccomment">/// 2544], [`PathSegment`] parsing should always try to consume a following</span> |
| <span class="doccomment">/// `<` token as the start of generic arguments, and reset to the `<` if</span> |
| <span class="doccomment">/// that fails (e.g. the token is acting as a less-than operator).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is the exact kind of parsing behavior which requires the "fork,</span> |
| <span class="doccomment">/// try, commit" behavior that [`ParseStream::fork`] discourages. With</span> |
| <span class="doccomment">/// `advance_to`, we can avoid having to parse the speculatively parsed</span> |
| <span class="doccomment">/// content a second time.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This change in behavior can be implemented in syn by replacing just the</span> |
| <span class="doccomment">/// `Parse` implementation for `PathSegment`:</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// # use syn::ext::IdentExt;</span> |
| <span class="doccomment">/// use syn::parse::discouraged::Speculative;</span> |
| <span class="doccomment">/// # use syn::parse::{Parse, ParseStream};</span> |
| <span class="doccomment">/// # use syn::{Ident, PathArguments, Result, Token};</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// pub struct PathSegment {</span> |
| <span class="doccomment">/// pub ident: Ident,</span> |
| <span class="doccomment">/// pub arguments: PathArguments,</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// # impl<T> From<T> for PathSegment</span> |
| <span class="doccomment">/// # where</span> |
| <span class="doccomment">/// # T: Into<Ident>,</span> |
| <span class="doccomment">/// # {</span> |
| <span class="doccomment">/// # fn from(ident: T) -> Self {</span> |
| <span class="doccomment">/// # PathSegment {</span> |
| <span class="doccomment">/// # ident: ident.into(),</span> |
| <span class="doccomment">/// # arguments: PathArguments::None,</span> |
| <span class="doccomment">/// # }</span> |
| <span class="doccomment">/// # }</span> |
| <span class="doccomment">/// # }</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// impl Parse for PathSegment {</span> |
| <span class="doccomment">/// fn parse(input: ParseStream) -> Result<Self> {</span> |
| <span class="doccomment">/// if input.peek(Token![super])</span> |
| <span class="doccomment">/// || input.peek(Token![self])</span> |
| <span class="doccomment">/// || input.peek(Token![Self])</span> |
| <span class="doccomment">/// || input.peek(Token![crate])</span> |
| <span class="doccomment">/// {</span> |
| <span class="doccomment">/// let ident = input.call(Ident::parse_any)?;</span> |
| <span class="doccomment">/// return Ok(PathSegment::from(ident));</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let ident = input.parse()?;</span> |
| <span class="doccomment">/// if input.peek(Token![::]) && input.peek3(Token![<]) {</span> |
| <span class="doccomment">/// return Ok(PathSegment {</span> |
| <span class="doccomment">/// ident,</span> |
| <span class="doccomment">/// arguments: PathArguments::AngleBracketed(input.parse()?),</span> |
| <span class="doccomment">/// });</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// if input.peek(Token![<]) && !input.peek(Token![<=]) {</span> |
| <span class="doccomment">/// let fork = input.fork();</span> |
| <span class="doccomment">/// if let Ok(arguments) = fork.parse() {</span> |
| <span class="doccomment">/// input.advance_to(&fork);</span> |
| <span class="doccomment">/// return Ok(PathSegment {</span> |
| <span class="doccomment">/// ident,</span> |
| <span class="doccomment">/// arguments: PathArguments::AngleBracketed(arguments),</span> |
| <span class="doccomment">/// });</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// Ok(PathSegment::from(ident))</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # syn::parse_str::<PathSegment>("a<b,c>").unwrap();</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Drawbacks</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The main drawback of this style of speculative parsing is in error</span> |
| <span class="doccomment">/// presentation. Even if the lookahead is the "correct" parse, the error</span> |
| <span class="doccomment">/// that is shown is that of the "fallback" parse. To use the same example</span> |
| <span class="doccomment">/// as the turbofish above, take the following unfinished "turbofish":</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```text</span> |
| <span class="doccomment">/// let _ = f<&'a fn(), for<'a> serde::>();</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If this is parsed as generic arguments, we can provide the error message</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```text</span> |
| <span class="doccomment">/// error: expected identifier</span> |
| <span class="doccomment">/// --> src.rs:L:C</span> |
| <span class="doccomment">/// |</span> |
| <span class="doccomment">/// L | let _ = f<&'a fn(), for<'a> serde::>();</span> |
| <span class="doccomment">/// | ^</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// but if parsed using the above speculative parsing, it falls back to</span> |
| <span class="doccomment">/// assuming that the `<` is a less-than when it fails to parse the generic</span> |
| <span class="doccomment">/// arguments, and tries to interpret the `&'a` as the start of a labelled</span> |
| <span class="doccomment">/// loop, resulting in the much less helpful error</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```text</span> |
| <span class="doccomment">/// error: expected `:`</span> |
| <span class="doccomment">/// --> src.rs:L:C</span> |
| <span class="doccomment">/// |</span> |
| <span class="doccomment">/// L | let _ = f<&'a fn(), for<'a> serde::>();</span> |
| <span class="doccomment">/// | ^^</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This can be mitigated with various heuristics (two examples: show both</span> |
| <span class="doccomment">/// forks' parse errors, or show the one that consumed more tokens), but</span> |
| <span class="doccomment">/// when you can control the grammar, sticking to something that can be</span> |
| <span class="doccomment">/// parsed LL(3) and without the LL(*) speculative parsing this makes</span> |
| <span class="doccomment">/// possible, displaying reasonable errors becomes much more simple.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [RFC 2544]: https://github.com/rust-lang/rfcs/pull/2544</span> |
| <span class="doccomment">/// [`PathSegment`]: crate::PathSegment</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Performance</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This method performs a cheap fixed amount of work that does not depend</span> |
| <span class="doccomment">/// on how far apart the two streams are positioned.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Panics</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The forked stream in the argument of `advance_to` must have been</span> |
| <span class="doccomment">/// obtained by forking `self`. Attempting to advance to any other stream</span> |
| <span class="doccomment">/// will cause a panic.</span> |
| <span class="kw">fn</span> <span class="ident">advance_to</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fork</span>: <span class="kw-2">&</span><span class="self">Self</span>); |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Speculative</span> <span class="kw">for</span> <span class="ident">ParseBuffer</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="kw">fn</span> <span class="ident">advance_to</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fork</span>: <span class="kw-2">&</span><span class="self">Self</span>) { |
| <span class="kw">if</span> <span class="op">!</span><span class="ident"><span class="kw">crate</span>::buffer::same_scope</span>(<span class="self">self</span>.<span class="ident">cursor</span>(), <span class="ident">fork</span>.<span class="ident">cursor</span>()) { |
| <span class="macro">panic!</span>(<span class="string">"Fork was not derived from the advancing parse stream"</span>); |
| } |
| |
| <span class="kw">let</span> (<span class="ident">self_unexp</span>, <span class="ident">self_sp</span>) <span class="op">=</span> <span class="ident">inner_unexpected</span>(<span class="self">self</span>); |
| <span class="kw">let</span> (<span class="ident">fork_unexp</span>, <span class="ident">fork_sp</span>) <span class="op">=</span> <span class="ident">inner_unexpected</span>(<span class="ident">fork</span>); |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">Rc::ptr_eq</span>(<span class="kw-2">&</span><span class="ident">self_unexp</span>, <span class="kw-2">&</span><span class="ident">fork_unexp</span>) { |
| <span class="kw">match</span> (<span class="ident">fork_sp</span>, <span class="ident">self_sp</span>) { |
| <span class="comment">// Unexpected set on the fork, but not on `self`, copy it over.</span> |
| (<span class="prelude-val">Some</span>(<span class="ident">span</span>), <span class="prelude-val">None</span>) => { |
| <span class="ident">self_unexp</span>.<span class="ident">set</span>(<span class="ident">Unexpected::Some</span>(<span class="ident">span</span>)); |
| } |
| <span class="comment">// Unexpected unset. Use chain to propagate errors from fork.</span> |
| (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) => { |
| <span class="ident">fork_unexp</span>.<span class="ident">set</span>(<span class="ident">Unexpected::Chain</span>(<span class="ident">self_unexp</span>)); |
| |
| <span class="comment">// Ensure toplevel 'unexpected' tokens from the fork don't</span> |
| <span class="comment">// bubble up the chain by replacing the root `unexpected`</span> |
| <span class="comment">// pointer, only 'unexpected' tokens from existing group</span> |
| <span class="comment">// parsers should bubble.</span> |
| <span class="ident">fork</span>.<span class="ident">unexpected</span> |
| .<span class="ident">set</span>(<span class="prelude-val">Some</span>(<span class="ident">Rc::new</span>(<span class="ident">Cell::new</span>(<span class="ident">Unexpected::None</span>)))); |
| } |
| <span class="comment">// Unexpected has been set on `self`. No changes needed.</span> |
| (<span class="kw">_</span>, <span class="prelude-val">Some</span>(<span class="kw">_</span>)) => {} |
| } |
| } |
| |
| <span class="comment">// See comment on `cell` in the struct definition.</span> |
| <span class="self">self</span>.<span class="ident">cell</span> |
| .<span class="ident">set</span>(<span class="kw">unsafe</span> { <span class="ident">mem::transmute</span>::<span class="op"><</span><span class="ident">Cursor</span>, <span class="ident">Cursor</span><span class="op"><</span><span class="lifetime">'static</span><span class="op">></span><span class="op">></span>(<span class="ident">fork</span>.<span class="ident">cursor</span>()) }); |
| } |
| } |
| </code></pre></div> |
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