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| </pre><pre class="rust"><code><span class="doccomment">//! Lexer for parsing format descriptions. |
| |
| </span><span class="kw">use </span>core::iter; |
| |
| <span class="kw">use super</span>::{unused, Error, Location, Spanned, SpannedValue}; |
| |
| <span class="doccomment">/// An iterator over the lexed tokens. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Lexed<I: Iterator> { |
| <span class="doccomment">/// The internal iterator. |
| </span>iter: core::iter::Peekable<I>, |
| } |
| |
| <span class="kw">impl</span><I: Iterator> Iterator <span class="kw">for </span>Lexed<I> { |
| <span class="kw">type </span>Item = I::Item; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.iter.next() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'iter</span>, <span class="lifetime">'token</span>: <span class="lifetime">'iter</span>, I: Iterator<Item = <span class="prelude-ty">Result</span><Token<<span class="lifetime">'token</span>>, Error>> + <span class="lifetime">'iter</span>> Lexed<I> { |
| <span class="doccomment">/// Peek at the next item in the iterator. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>peek(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>I::Item> { |
| <span class="self">self</span>.iter.peek() |
| } |
| |
| <span class="doccomment">/// Consume the next token if it is whitespace. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>next_if_whitespace(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Spanned<<span class="kw-2">&</span><span class="lifetime">'token </span>[u8]>> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="prelude-val">Ok</span>(Token::ComponentPart { |
| kind: ComponentKind::Whitespace, |
| value, |
| })) = <span class="self">self</span>.peek() |
| { |
| <span class="self">self</span>.next(); <span class="comment">// consume |
| </span><span class="prelude-val">Some</span>(value) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="doccomment">/// Consume the next token if it is a component item that is not whitespace. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>next_if_not_whitespace(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Spanned<<span class="kw-2">&</span><span class="lifetime">'token </span>[u8]>> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="prelude-val">Ok</span>(Token::ComponentPart { |
| kind: ComponentKind::NotWhitespace, |
| value, |
| })) = <span class="self">self</span>.peek() |
| { |
| <span class="self">self</span>.next(); <span class="comment">// consume |
| </span><span class="prelude-val">Some</span>(value) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="doccomment">/// Consume the next token if it is an opening bracket. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>next_if_opening_bracket(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Location> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="prelude-val">Ok</span>(Token::Bracket { |
| kind: BracketKind::Opening, |
| location, |
| })) = <span class="self">self</span>.peek() |
| { |
| <span class="self">self</span>.next(); <span class="comment">// consume |
| </span><span class="prelude-val">Some</span>(location) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="doccomment">/// Peek at the next token if it is a closing bracket. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>peek_closing_bracket(<span class="kw-2">&</span><span class="lifetime">'iter </span><span class="kw-2">mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'iter </span>Location> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(Token::Bracket { |
| kind: BracketKind::Closing, |
| location, |
| })) = <span class="self">self</span>.peek() |
| { |
| <span class="prelude-val">Some</span>(location) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="doccomment">/// Consume the next token if it is a closing bracket. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>next_if_closing_bracket(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Location> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="prelude-val">Ok</span>(Token::Bracket { |
| kind: BracketKind::Closing, |
| location, |
| })) = <span class="self">self</span>.peek() |
| { |
| <span class="self">self</span>.next(); <span class="comment">// consume |
| </span><span class="prelude-val">Some</span>(location) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| } |
| |
| <span class="doccomment">/// A token emitted by the lexer. There is no semantic meaning at this stage. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">enum </span>Token<<span class="lifetime">'a</span>> { |
| <span class="doccomment">/// A literal string, formatted and parsed as-is. |
| </span>Literal(Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>), |
| <span class="doccomment">/// An opening or closing bracket. May or may not be the start or end of a component. |
| </span>Bracket { |
| <span class="doccomment">/// Whether the bracket is opening or closing. |
| </span>kind: BracketKind, |
| <span class="doccomment">/// Where the bracket was in the format string. |
| </span>location: Location, |
| }, |
| <span class="doccomment">/// One part of a component. This could be its name, a modifier, or whitespace. |
| </span>ComponentPart { |
| <span class="doccomment">/// Whether the part is whitespace or not. |
| </span>kind: ComponentKind, |
| <span class="doccomment">/// The part itself. |
| </span>value: Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>, |
| }, |
| } |
| |
| <span class="doccomment">/// What type of bracket is present. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">enum </span>BracketKind { |
| <span class="doccomment">/// An opening bracket: `[` |
| </span>Opening, |
| <span class="doccomment">/// A closing bracket: `]` |
| </span>Closing, |
| } |
| |
| <span class="doccomment">/// Indicates whether the component is whitespace or not. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">enum </span>ComponentKind { |
| <span class="attribute">#[allow(clippy::missing_docs_in_private_items)] |
| </span>Whitespace, |
| <span class="attribute">#[allow(clippy::missing_docs_in_private_items)] |
| </span>NotWhitespace, |
| } |
| |
| <span class="doccomment">/// Attach [`Location`] information to each byte in the iterator. |
| </span><span class="kw">fn </span>attach_location<<span class="lifetime">'item</span>>( |
| iter: <span class="kw">impl </span>Iterator<Item = <span class="kw-2">&</span><span class="lifetime">'item </span>u8>, |
| ) -> <span class="kw">impl </span>Iterator<Item = (<span class="kw-2">&</span><span class="lifetime">'item </span>u8, Location)> { |
| <span class="kw">let </span><span class="kw-2">mut </span>byte_pos = <span class="number">0</span>; |
| |
| iter.map(<span class="kw">move </span>|byte| { |
| <span class="kw">let </span>location = Location { byte: byte_pos }; |
| byte_pos += <span class="number">1</span>; |
| (byte, location) |
| }) |
| } |
| |
| <span class="doccomment">/// Parse the string into a series of [`Token`]s. |
| /// |
| /// `VERSION` controls the version of the format description that is being parsed. Currently, this |
| /// must be 1 or 2. |
| /// |
| /// - When `VERSION` is 1, `[[` is the only escape sequence, resulting in a literal `[`. |
| /// - When `VERSION` is 2, all escape sequences begin with `\`. The only characters that may |
| /// currently follow are `\`, `[`, and `]`, all of which result in the literal character. All |
| /// other characters result in a lex error. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>lex<<span class="kw">const </span>VERSION: usize>( |
| <span class="kw-2">mut </span>input: <span class="kw-2">&</span>[u8], |
| ) -> Lexed<<span class="kw">impl </span>Iterator<Item = <span class="prelude-ty">Result</span><Token<<span class="lifetime">'_</span>>, Error>>> { |
| <span class="macro">validate_version!</span>(VERSION); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>depth: u8 = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = attach_location(input.iter()).peekable(); |
| <span class="kw">let </span><span class="kw-2">mut </span>second_bracket_location = <span class="prelude-val">None</span>; |
| |
| <span class="kw">let </span>iter = iter::from_fn(<span class="kw">move </span>|| { |
| <span class="comment">// The flag is only set when version is zero. |
| </span><span class="kw">if </span><span class="macro">version!</span>(..=<span class="number">1</span>) { |
| <span class="comment">// There is a flag set to emit the second half of an escaped bracket pair. |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(location) = second_bracket_location.take() { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(Token::Bracket { |
| kind: BracketKind::Opening, |
| location, |
| })); |
| } |
| } |
| |
| <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="kw">match </span>iter.next()<span class="question-mark">? </span>{ |
| <span class="comment">// possible escape sequence |
| </span>(<span class="string">b'\\'</span>, backslash_loc) <span class="kw">if </span><span class="macro">version!</span>(<span class="number">2</span>..) => { |
| <span class="kw">match </span>iter.next() { |
| <span class="prelude-val">Some</span>((<span class="string">b'\\' </span>| <span class="string">b'[' </span>| <span class="string">b']'</span>, char_loc)) => { |
| <span class="comment">// The escaped character is emitted as-is. |
| </span><span class="kw">let </span>char = <span class="kw-2">&</span>input[<span class="number">1</span>..<span class="number">2</span>]; |
| input = <span class="kw-2">&</span>input[<span class="number">2</span>..]; |
| <span class="kw">if </span>depth == <span class="number">0 </span>{ |
| Token::Literal(char.spanned(backslash_loc.to(char_loc))) |
| } <span class="kw">else </span>{ |
| Token::ComponentPart { |
| kind: ComponentKind::NotWhitespace, |
| value: char.spanned(backslash_loc.to(char_loc)), |
| } |
| } |
| } |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, loc)) => { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(Error { |
| _inner: unused(loc.error(<span class="string">"invalid escape sequence"</span>)), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::Expected { |
| what: <span class="string">"valid escape sequence"</span>, |
| index: loc.byte <span class="kw">as _</span>, |
| }, |
| })); |
| } |
| <span class="prelude-val">None </span>=> { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(Error { |
| _inner: unused(backslash_loc.error(<span class="string">"unexpected end of input"</span>)), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::Expected { |
| what: <span class="string">"valid escape sequence"</span>, |
| index: backslash_loc.byte <span class="kw">as _</span>, |
| }, |
| })); |
| } |
| } |
| } |
| <span class="comment">// potentially escaped opening bracket |
| </span>(<span class="string">b'['</span>, location) <span class="kw">if </span><span class="macro">version!</span>(..=<span class="number">1</span>) => { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((<span class="kw">_</span>, second_location)) = iter.next_if(|<span class="kw-2">&</span>(<span class="kw-2">&</span>byte, <span class="kw">_</span>)| byte == <span class="string">b'['</span>) { |
| <span class="comment">// Escaped bracket. Store the location of the second so we can emit it later. |
| </span>second_bracket_location = <span class="prelude-val">Some</span>(second_location); |
| input = <span class="kw-2">&</span>input[<span class="number">2</span>..]; |
| } <span class="kw">else </span>{ |
| <span class="comment">// opening bracket |
| </span>depth += <span class="number">1</span>; |
| input = <span class="kw-2">&</span>input[<span class="number">1</span>..]; |
| } |
| |
| Token::Bracket { |
| kind: BracketKind::Opening, |
| location, |
| } |
| } |
| <span class="comment">// opening bracket |
| </span>(<span class="string">b'['</span>, location) => { |
| depth += <span class="number">1</span>; |
| input = <span class="kw-2">&</span>input[<span class="number">1</span>..]; |
| |
| Token::Bracket { |
| kind: BracketKind::Opening, |
| location, |
| } |
| } |
| <span class="comment">// closing bracket |
| </span>(<span class="string">b']'</span>, location) <span class="kw">if </span>depth > <span class="number">0 </span>=> { |
| depth -= <span class="number">1</span>; |
| input = <span class="kw-2">&</span>input[<span class="number">1</span>..]; |
| |
| Token::Bracket { |
| kind: BracketKind::Closing, |
| location, |
| } |
| } |
| <span class="comment">// literal |
| </span>(<span class="kw">_</span>, start_location) <span class="kw">if </span>depth == <span class="number">0 </span>=> { |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes = <span class="number">1</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>end_location = start_location; |
| |
| <span class="kw">while let </span><span class="prelude-val">Some</span>((<span class="kw">_</span>, location)) = |
| iter.next_if(|<span class="kw-2">&</span>(<span class="kw-2">&</span>byte, <span class="kw">_</span>)| !((<span class="macro">version!</span>(<span class="number">2</span>..) && byte == <span class="string">b'\\'</span>) || byte == <span class="string">b'['</span>)) |
| { |
| end_location = location; |
| bytes += <span class="number">1</span>; |
| } |
| |
| <span class="kw">let </span>value = <span class="kw-2">&</span>input[..bytes]; |
| input = <span class="kw-2">&</span>input[bytes..]; |
| |
| Token::Literal(value.spanned(start_location.to(end_location))) |
| } |
| <span class="comment">// component part |
| </span>(byte, start_location) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes = <span class="number">1</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>end_location = start_location; |
| <span class="kw">let </span>is_whitespace = byte.is_ascii_whitespace(); |
| |
| <span class="kw">while let </span><span class="prelude-val">Some</span>((<span class="kw">_</span>, location)) = iter.next_if(|<span class="kw-2">&</span>(byte, <span class="kw">_</span>)| { |
| !<span class="macro">matches!</span>(byte, <span class="string">b'\\' </span>| <span class="string">b'[' </span>| <span class="string">b']'</span>) |
| && is_whitespace == byte.is_ascii_whitespace() |
| }) { |
| end_location = location; |
| bytes += <span class="number">1</span>; |
| } |
| |
| <span class="kw">let </span>value = <span class="kw-2">&</span>input[..bytes]; |
| input = <span class="kw-2">&</span>input[bytes..]; |
| |
| Token::ComponentPart { |
| kind: <span class="kw">if </span>is_whitespace { |
| ComponentKind::Whitespace |
| } <span class="kw">else </span>{ |
| ComponentKind::NotWhitespace |
| }, |
| value: value.spanned(start_location.to(end_location)), |
| } |
| } |
| })) |
| }); |
| |
| Lexed { |
| iter: iter.peekable(), |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="time" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
