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| </pre><pre class="rust"><code><span class="doccomment">//! AST for parsing format descriptions. |
| |
| </span><span class="kw">use </span>alloc::boxed::Box; |
| <span class="kw">use </span>alloc::string::String; |
| <span class="kw">use </span>alloc::vec::Vec; |
| <span class="kw">use </span>core::iter; |
| |
| <span class="kw">use super</span>::{lexer, unused, Error, Location, Spanned, SpannedValue, Unused}; |
| |
| <span class="doccomment">/// One part of a complete format description. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">enum </span>Item<<span class="lifetime">'a</span>> { |
| <span class="doccomment">/// A literal string, formatted and parsed as-is. |
| /// |
| /// This should never be present inside a nested format description. |
| </span>Literal(Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>), |
| <span class="doccomment">/// A sequence of brackets. The first acts as the escape character. |
| /// |
| /// This should never be present if the lexer has `BACKSLASH_ESCAPE` set to `true`. |
| </span>EscapedBracket { |
| <span class="doccomment">/// The first bracket. |
| </span>_first: Unused<Location>, |
| <span class="doccomment">/// The second bracket. |
| </span>_second: Unused<Location>, |
| }, |
| <span class="doccomment">/// Part of a type, along with its modifiers. |
| </span>Component { |
| <span class="doccomment">/// Where the opening bracket was in the format string. |
| </span>_opening_bracket: Unused<Location>, |
| <span class="doccomment">/// Whitespace between the opening bracket and name. |
| </span>_leading_whitespace: Unused<<span class="prelude-ty">Option</span><Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>>>, |
| <span class="doccomment">/// The name of the component. |
| </span>name: Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>, |
| <span class="doccomment">/// The modifiers for the component. |
| </span>modifiers: Box<[Modifier<<span class="lifetime">'a</span>>]>, |
| <span class="doccomment">/// Whitespace between the modifiers and closing bracket. |
| </span>_trailing_whitespace: Unused<<span class="prelude-ty">Option</span><Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>>>, |
| <span class="doccomment">/// Where the closing bracket was in the format string. |
| </span>_closing_bracket: Unused<Location>, |
| }, |
| <span class="doccomment">/// An optional sequence of items. |
| </span>Optional { |
| <span class="doccomment">/// Where the opening bracket was in the format string. |
| </span>opening_bracket: Location, |
| <span class="doccomment">/// Whitespace between the opening bracket and "optional". |
| </span>_leading_whitespace: Unused<<span class="prelude-ty">Option</span><Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>>>, |
| <span class="doccomment">/// The "optional" keyword. |
| </span>_optional_kw: Unused<Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>>, |
| <span class="doccomment">/// Whitespace between the "optional" keyword and the opening bracket. |
| </span>_whitespace: Unused<Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>>, |
| <span class="doccomment">/// The items within the optional sequence. |
| </span>nested_format_description: NestedFormatDescription<<span class="lifetime">'a</span>>, |
| <span class="doccomment">/// Where the closing bracket was in the format string. |
| </span>closing_bracket: Location, |
| }, |
| <span class="doccomment">/// The first matching parse of a sequence of items. |
| </span>First { |
| <span class="doccomment">/// Where the opening bracket was in the format string. |
| </span>opening_bracket: Location, |
| <span class="doccomment">/// Whitespace between the opening bracket and "first". |
| </span>_leading_whitespace: Unused<<span class="prelude-ty">Option</span><Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>>>, |
| <span class="doccomment">/// The "first" keyword. |
| </span>_first_kw: Unused<Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>>, |
| <span class="doccomment">/// Whitespace between the "first" keyword and the opening bracket. |
| </span>_whitespace: Unused<Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>>, |
| <span class="doccomment">/// The sequences of items to try. |
| </span>nested_format_descriptions: Box<[NestedFormatDescription<<span class="lifetime">'a</span>>]>, |
| <span class="doccomment">/// Where the closing bracket was in the format string. |
| </span>closing_bracket: Location, |
| }, |
| } |
| |
| <span class="doccomment">/// A format description that is nested within another format description. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>NestedFormatDescription<<span class="lifetime">'a</span>> { |
| <span class="doccomment">/// Where the opening bracket was in the format string. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) _opening_bracket: Unused<Location>, |
| <span class="doccomment">/// The items within the nested format description. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) items: Box<[Item<<span class="lifetime">'a</span>>]>, |
| <span class="doccomment">/// Where the closing bracket was in the format string. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) _closing_bracket: Unused<Location>, |
| <span class="doccomment">/// Whitespace between the closing bracket and the next item. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) _trailing_whitespace: Unused<<span class="prelude-ty">Option</span><Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>>>, |
| } |
| |
| <span class="doccomment">/// A modifier for a component. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Modifier<<span class="lifetime">'a</span>> { |
| <span class="doccomment">/// Whitespace preceding the modifier. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) _leading_whitespace: Unused<Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>>, |
| <span class="doccomment">/// The key of the modifier. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) key: Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>, |
| <span class="doccomment">/// Where the colon of the modifier was in the format string. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) _colon: Unused<Location>, |
| <span class="doccomment">/// The value of the modifier. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) value: Spanned<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>, |
| } |
| |
| <span class="doccomment">/// Parse the provided tokens into an AST. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>parse< |
| <span class="lifetime">'item</span>: <span class="lifetime">'iter</span>, |
| <span class="lifetime">'iter</span>, |
| I: Iterator<Item = <span class="prelude-ty">Result</span><lexer::Token<<span class="lifetime">'item</span>>, Error>>, |
| <span class="kw">const </span>VERSION: usize, |
| >( |
| tokens: <span class="kw-2">&</span><span class="lifetime">'iter </span><span class="kw-2">mut </span>lexer::Lexed<I>, |
| ) -> <span class="kw">impl </span>Iterator<Item = <span class="prelude-ty">Result</span><Item<<span class="lifetime">'item</span>>, Error>> + <span class="lifetime">'iter </span>{ |
| <span class="macro">validate_version!</span>(VERSION); |
| parse_inner::<<span class="kw">_</span>, <span class="bool-val">false</span>, VERSION>(tokens) |
| } |
| |
| <span class="doccomment">/// Parse the provided tokens into an AST. The const generic indicates whether the resulting |
| /// [`Item`] will be used directly or as part of a [`NestedFormatDescription`]. |
| </span><span class="kw">fn </span>parse_inner< |
| <span class="lifetime">'item</span>, |
| I: Iterator<Item = <span class="prelude-ty">Result</span><lexer::Token<<span class="lifetime">'item</span>>, Error>>, |
| <span class="kw">const </span>NESTED: bool, |
| <span class="kw">const </span>VERSION: usize, |
| >( |
| tokens: <span class="kw-2">&mut </span>lexer::Lexed<I>, |
| ) -> <span class="kw">impl </span>Iterator<Item = <span class="prelude-ty">Result</span><Item<<span class="lifetime">'item</span>>, Error>> + <span class="lifetime">'_ </span>{ |
| <span class="macro">validate_version!</span>(VERSION); |
| iter::from_fn(<span class="kw">move </span>|| { |
| <span class="kw">if </span>NESTED && tokens.peek_closing_bracket().is_some() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="kw">let </span>next = <span class="kw">match </span>tokens.next()<span class="question-mark">? </span>{ |
| <span class="prelude-val">Ok</span>(token) => token, |
| <span class="prelude-val">Err</span>(err) => <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(err)), |
| }; |
| |
| <span class="prelude-val">Some</span>(<span class="kw">match </span>next { |
| lexer::Token::Literal(Spanned { value: <span class="kw">_</span>, span: <span class="kw">_ </span>}) <span class="kw">if </span>NESTED => { |
| <span class="macro">bug!</span>(<span class="string">"literal should not be present in nested description"</span>) |
| } |
| lexer::Token::Literal(value) => <span class="prelude-val">Ok</span>(Item::Literal(value)), |
| lexer::Token::Bracket { |
| kind: lexer::BracketKind::Opening, |
| 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>(second_location) = tokens.next_if_opening_bracket() { |
| <span class="prelude-val">Ok</span>(Item::EscapedBracket { |
| _first: unused(location), |
| _second: unused(second_location), |
| }) |
| } <span class="kw">else </span>{ |
| parse_component::<<span class="kw">_</span>, VERSION>(location, tokens) |
| } |
| } <span class="kw">else </span>{ |
| parse_component::<<span class="kw">_</span>, VERSION>(location, tokens) |
| } |
| } |
| lexer::Token::Bracket { |
| kind: lexer::BracketKind::Closing, |
| location: <span class="kw">_</span>, |
| } <span class="kw">if </span>NESTED => { |
| <span class="macro">bug!</span>(<span class="string">"closing bracket should be caught by the `if` statement"</span>) |
| } |
| lexer::Token::Bracket { |
| kind: lexer::BracketKind::Closing, |
| location: <span class="kw">_</span>, |
| } => { |
| <span class="macro">bug!</span>(<span class="string">"closing bracket should have been consumed by `parse_component`"</span>) |
| } |
| lexer::Token::ComponentPart { |
| kind: <span class="kw">_</span>, <span class="comment">// whitespace is significant in nested components |
| </span>value, |
| } <span class="kw">if </span>NESTED => <span class="prelude-val">Ok</span>(Item::Literal(value)), |
| lexer::Token::ComponentPart { kind: <span class="kw">_</span>, value: <span class="kw">_ </span>} => { |
| <span class="macro">bug!</span>(<span class="string">"component part should have been consumed by `parse_component`"</span>) |
| } |
| }) |
| }) |
| } |
| |
| <span class="doccomment">/// Parse a component. This assumes that the opening bracket has already been consumed. |
| </span><span class="kw">fn </span>parse_component< |
| <span class="lifetime">'a</span>, |
| I: Iterator<Item = <span class="prelude-ty">Result</span><lexer::Token<<span class="lifetime">'a</span>>, Error>>, |
| <span class="kw">const </span>VERSION: usize, |
| >( |
| opening_bracket: Location, |
| tokens: <span class="kw-2">&mut </span>lexer::Lexed<I>, |
| ) -> <span class="prelude-ty">Result</span><Item<<span class="lifetime">'a</span>>, Error> { |
| <span class="macro">validate_version!</span>(VERSION); |
| <span class="kw">let </span>leading_whitespace = tokens.next_if_whitespace(); |
| |
| <span class="kw">let </span><span class="prelude-val">Some</span>(name) = tokens.next_if_not_whitespace() <span class="kw">else </span>{ |
| <span class="kw">let </span>span = <span class="kw">match </span>leading_whitespace { |
| <span class="prelude-val">Some</span>(Spanned { value: <span class="kw">_</span>, span }) => span, |
| <span class="prelude-val">None </span>=> opening_bracket.to(opening_bracket), |
| }; |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error { |
| _inner: unused(span.error(<span class="string">"expected component name"</span>)), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::MissingComponentName { |
| index: span.start.byte <span class="kw">as _</span>, |
| }, |
| }); |
| }; |
| |
| <span class="kw">if </span><span class="kw-2">*</span>name == <span class="string">b"optional" </span>{ |
| <span class="kw">let </span><span class="prelude-val">Some</span>(whitespace) = tokens.next_if_whitespace() <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error { |
| _inner: unused(name.span.error(<span class="string">"expected whitespace after `optional`"</span>)), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::Expected { |
| what: <span class="string">"whitespace after `optional`"</span>, |
| index: name.span.end.byte <span class="kw">as _</span>, |
| }, |
| }); |
| }; |
| |
| <span class="kw">let </span>nested = parse_nested::<<span class="kw">_</span>, VERSION>(whitespace.span.end, tokens)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span><span class="prelude-val">Some</span>(closing_bracket) = tokens.next_if_closing_bracket() <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error { |
| _inner: unused(opening_bracket.error(<span class="string">"unclosed bracket"</span>)), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::UnclosedOpeningBracket { |
| index: opening_bracket.byte <span class="kw">as _</span>, |
| }, |
| }); |
| }; |
| |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Item::Optional { |
| opening_bracket, |
| _leading_whitespace: unused(leading_whitespace), |
| _optional_kw: unused(name), |
| _whitespace: unused(whitespace), |
| nested_format_description: nested, |
| closing_bracket, |
| }); |
| } |
| |
| <span class="kw">if </span><span class="kw-2">*</span>name == <span class="string">b"first" </span>{ |
| <span class="kw">let </span><span class="prelude-val">Some</span>(whitespace) = tokens.next_if_whitespace() <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error { |
| _inner: unused(name.span.error(<span class="string">"expected whitespace after `first`"</span>)), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::Expected { |
| what: <span class="string">"whitespace after `first`"</span>, |
| index: name.span.end.byte <span class="kw">as _</span>, |
| }, |
| }); |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>nested_format_descriptions = Vec::new(); |
| <span class="kw">while let </span><span class="prelude-val">Ok</span>(description) = parse_nested::<<span class="kw">_</span>, VERSION>(whitespace.span.end, tokens) { |
| nested_format_descriptions.push(description); |
| } |
| |
| <span class="kw">let </span><span class="prelude-val">Some</span>(closing_bracket) = tokens.next_if_closing_bracket() <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error { |
| _inner: unused(opening_bracket.error(<span class="string">"unclosed bracket"</span>)), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::UnclosedOpeningBracket { |
| index: opening_bracket.byte <span class="kw">as _</span>, |
| }, |
| }); |
| }; |
| |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Item::First { |
| opening_bracket, |
| _leading_whitespace: unused(leading_whitespace), |
| _first_kw: unused(name), |
| _whitespace: unused(whitespace), |
| nested_format_descriptions: nested_format_descriptions.into_boxed_slice(), |
| closing_bracket, |
| }); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>modifiers = Vec::new(); |
| <span class="kw">let </span>trailing_whitespace = <span class="kw">loop </span>{ |
| <span class="kw">let </span><span class="prelude-val">Some</span>(whitespace) = tokens.next_if_whitespace() <span class="kw">else </span>{ <span class="kw">break </span><span class="prelude-val">None </span>}; |
| |
| <span class="comment">// This is not necessary for proper parsing, but provides a much better error when a nested |
| // description is used where it's not allowed. |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(location) = tokens.next_if_opening_bracket() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error { |
| _inner: unused( |
| location |
| .to(location) |
| .error(<span class="string">"modifier must be of the form `key:value`"</span>), |
| ), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::InvalidModifier { |
| value: String::from(<span class="string">"["</span>), |
| index: location.byte <span class="kw">as _</span>, |
| }, |
| }); |
| } |
| |
| <span class="kw">let </span><span class="prelude-val">Some</span>(Spanned { value, span }) = tokens.next_if_not_whitespace() <span class="kw">else </span>{ |
| <span class="kw">break </span><span class="prelude-val">Some</span>(whitespace); |
| }; |
| |
| <span class="kw">let </span><span class="prelude-val">Some</span>(colon_index) = value.iter().position(|<span class="kw-2">&</span>b| b == <span class="string">b':'</span>) <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error { |
| _inner: unused(span.error(<span class="string">"modifier must be of the form `key:value`"</span>)), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::InvalidModifier { |
| value: String::from_utf8_lossy(value).into_owned(), |
| index: span.start.byte <span class="kw">as _</span>, |
| }, |
| }); |
| }; |
| <span class="kw">let </span>key = <span class="kw-2">&</span>value[..colon_index]; |
| <span class="kw">let </span>value = <span class="kw-2">&</span>value[colon_index + <span class="number">1</span>..]; |
| |
| <span class="kw">if </span>key.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error { |
| _inner: unused(span.shrink_to_start().error(<span class="string">"expected modifier key"</span>)), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::InvalidModifier { |
| value: String::new(), |
| index: span.start.byte <span class="kw">as _</span>, |
| }, |
| }); |
| } |
| <span class="kw">if </span>value.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error { |
| _inner: unused(span.shrink_to_end().error(<span class="string">"expected modifier value"</span>)), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::InvalidModifier { |
| value: String::new(), |
| index: span.shrink_to_end().start.byte <span class="kw">as _</span>, |
| }, |
| }); |
| } |
| |
| modifiers.push(Modifier { |
| _leading_whitespace: unused(whitespace), |
| key: key.spanned(span.shrink_to_before(colon_index <span class="kw">as _</span>)), |
| _colon: unused(span.start.offset(colon_index <span class="kw">as _</span>)), |
| value: value.spanned(span.shrink_to_after(colon_index <span class="kw">as _</span>)), |
| }); |
| }; |
| |
| <span class="kw">let </span><span class="prelude-val">Some</span>(closing_bracket) = tokens.next_if_closing_bracket() <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error { |
| _inner: unused(opening_bracket.error(<span class="string">"unclosed bracket"</span>)), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::UnclosedOpeningBracket { |
| index: opening_bracket.byte <span class="kw">as _</span>, |
| }, |
| }); |
| }; |
| |
| <span class="prelude-val">Ok</span>(Item::Component { |
| _opening_bracket: unused(opening_bracket), |
| _leading_whitespace: unused(leading_whitespace), |
| name, |
| modifiers: modifiers.into_boxed_slice(), |
| _trailing_whitespace: unused(trailing_whitespace), |
| _closing_bracket: unused(closing_bracket), |
| }) |
| } |
| |
| <span class="doccomment">/// Parse a nested format description. The location provided is the the most recent one consumed. |
| </span><span class="kw">fn </span>parse_nested<<span class="lifetime">'a</span>, I: Iterator<Item = <span class="prelude-ty">Result</span><lexer::Token<<span class="lifetime">'a</span>>, Error>>, <span class="kw">const </span>VERSION: usize>( |
| last_location: Location, |
| tokens: <span class="kw-2">&mut </span>lexer::Lexed<I>, |
| ) -> <span class="prelude-ty">Result</span><NestedFormatDescription<<span class="lifetime">'a</span>>, Error> { |
| <span class="macro">validate_version!</span>(VERSION); |
| <span class="kw">let </span><span class="prelude-val">Some</span>(opening_bracket) = tokens.next_if_opening_bracket() <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error { |
| _inner: unused(last_location.error(<span class="string">"expected opening bracket"</span>)), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::Expected { |
| what: <span class="string">"opening bracket"</span>, |
| index: last_location.byte <span class="kw">as _</span>, |
| }, |
| }); |
| }; |
| <span class="kw">let </span>items = parse_inner::<<span class="kw">_</span>, <span class="bool-val">true</span>, VERSION>(tokens).collect::<<span class="prelude-ty">Result</span><<span class="kw">_</span>, <span class="kw">_</span>>>()<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="prelude-val">Some</span>(closing_bracket) = tokens.next_if_closing_bracket() <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error { |
| _inner: unused(opening_bracket.error(<span class="string">"unclosed bracket"</span>)), |
| public: <span class="kw">crate</span>::error::InvalidFormatDescription::UnclosedOpeningBracket { |
| index: opening_bracket.byte <span class="kw">as _</span>, |
| }, |
| }); |
| }; |
| <span class="kw">let </span>trailing_whitespace = tokens.next_if_whitespace(); |
| |
| <span class="prelude-val">Ok</span>(NestedFormatDescription { |
| _opening_bracket: unused(opening_bracket), |
| items, |
| _closing_bracket: unused(closing_bracket), |
| _trailing_whitespace: unused(trailing_whitespace), |
| }) |
| } |
| </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> |
