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</pre><pre class='rust '>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>borrow</span>::<span class='ident'>Cow</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>char</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>str</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>string</span>;
<span class='kw'>use</span> <span class='self'>self</span>::<span class='ident'>Token</span>::<span class='kw-2'>*</span>;
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Eq</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Token</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='ident'>Whitespace</span>(<span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span>),
<span class='ident'>Newline</span>,
<span class='ident'>Comment</span>(<span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span>),
<span class='ident'>Equals</span>,
<span class='ident'>Period</span>,
<span class='ident'>Comma</span>,
<span class='ident'>Colon</span>,
<span class='ident'>Plus</span>,
<span class='ident'>LeftBrace</span>,
<span class='ident'>RightBrace</span>,
<span class='ident'>LeftBracket</span>,
<span class='ident'>RightBracket</span>,
<span class='ident'>Keylike</span>(<span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span>),
<span class='ident'>String</span> { <span class='ident'>src</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span>, <span class='ident'>val</span>: <span class='ident'>Cow</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>str</span><span class='op'>></span> },
}
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Eq</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Error</span> {
<span class='ident'>InvalidCharInString</span>(<span class='ident'>usize</span>, <span class='ident'>char</span>),
<span class='ident'>InvalidEscape</span>(<span class='ident'>usize</span>, <span class='ident'>char</span>),
<span class='ident'>InvalidHexEscape</span>(<span class='ident'>usize</span>, <span class='ident'>char</span>),
<span class='ident'>InvalidEscapeValue</span>(<span class='ident'>usize</span>, <span class='ident'>u32</span>),
<span class='ident'>NewlineInString</span>(<span class='ident'>usize</span>),
<span class='ident'>Unexpected</span>(<span class='ident'>usize</span>, <span class='ident'>char</span>),
<span class='ident'>UnterminatedString</span>(<span class='ident'>usize</span>),
<span class='ident'>NewlineInTableKey</span>(<span class='ident'>usize</span>),
<span class='ident'>EmptyTableKey</span>(<span class='ident'>usize</span>),
<span class='ident'>Wanted</span> { <span class='ident'>at</span>: <span class='ident'>usize</span>, <span class='ident'>expected</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>, <span class='ident'>found</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span> },
}
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Tokenizer</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='ident'>input</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span>,
<span class='ident'>chars</span>: <span class='ident'>CrlfFold</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>,
}
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>)]</span>
<span class='kw'>struct</span> <span class='ident'>CrlfFold</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='ident'>chars</span>: <span class='ident'>str</span>::<span class='ident'>CharIndices</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>,
}
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='kw'>enum</span> <span class='ident'>MaybeString</span> {
<span class='ident'>NotEscaped</span>(<span class='ident'>usize</span>),
<span class='ident'>Owned</span>(<span class='ident'>string</span>::<span class='ident'>String</span>),
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> <span class='ident'>Tokenizer</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>input</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span>) <span class='op'>-></span> <span class='ident'>Tokenizer</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>t</span> <span class='op'>=</span> <span class='ident'>Tokenizer</span> {
<span class='ident'>input</span>: <span class='ident'>input</span>,
<span class='ident'>chars</span>: <span class='ident'>CrlfFold</span> {
<span class='ident'>chars</span>: <span class='ident'>input</span>.<span class='ident'>char_indices</span>(),
},
};
<span class='comment'>// Eat utf-8 BOM</span>
<span class='ident'>t</span>.<span class='ident'>eatc</span>(<span class='string'>'\u{feff}'</span>);
<span class='kw'>return</span> <span class='ident'>t</span>
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>Token</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>>></span>, <span class='ident'>Error</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='ident'>token</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>((_, <span class='string'>'\n'</span>)) <span class='op'>=></span> <span class='ident'>Newline</span>,
<span class='prelude-val'>Some</span>((<span class='ident'>start</span>, <span class='string'>' '</span>)) <span class='op'>=></span> <span class='self'>self</span>.<span class='ident'>whitespace_token</span>(<span class='ident'>start</span>),
<span class='prelude-val'>Some</span>((<span class='ident'>start</span>, <span class='string'>'\t'</span>)) <span class='op'>=></span> <span class='self'>self</span>.<span class='ident'>whitespace_token</span>(<span class='ident'>start</span>),
<span class='prelude-val'>Some</span>((<span class='ident'>start</span>, <span class='string'>'#'</span>)) <span class='op'>=></span> <span class='self'>self</span>.<span class='ident'>comment_token</span>(<span class='ident'>start</span>),
<span class='prelude-val'>Some</span>((_, <span class='string'>'='</span>)) <span class='op'>=></span> <span class='ident'>Equals</span>,
<span class='prelude-val'>Some</span>((_, <span class='string'>'.'</span>)) <span class='op'>=></span> <span class='ident'>Period</span>,
<span class='prelude-val'>Some</span>((_, <span class='string'>','</span>)) <span class='op'>=></span> <span class='ident'>Comma</span>,
<span class='prelude-val'>Some</span>((_, <span class='string'>':'</span>)) <span class='op'>=></span> <span class='ident'>Colon</span>,
<span class='prelude-val'>Some</span>((_, <span class='string'>'+'</span>)) <span class='op'>=></span> <span class='ident'>Plus</span>,
<span class='prelude-val'>Some</span>((_, <span class='string'>'{'</span>)) <span class='op'>=></span> <span class='ident'>LeftBrace</span>,
<span class='prelude-val'>Some</span>((_, <span class='string'>'}'</span>)) <span class='op'>=></span> <span class='ident'>RightBrace</span>,
<span class='prelude-val'>Some</span>((_, <span class='string'>'['</span>)) <span class='op'>=></span> <span class='ident'>LeftBracket</span>,
<span class='prelude-val'>Some</span>((_, <span class='string'>']'</span>)) <span class='op'>=></span> <span class='ident'>RightBracket</span>,
<span class='prelude-val'>Some</span>((<span class='ident'>start</span>, <span class='string'>'\''</span>)) <span class='op'>=></span> <span class='kw'>return</span> <span class='self'>self</span>.<span class='ident'>literal_string</span>(<span class='ident'>start</span>).<span class='ident'>map</span>(<span class='prelude-val'>Some</span>),
<span class='prelude-val'>Some</span>((<span class='ident'>start</span>, <span class='string'>'"'</span>)) <span class='op'>=></span> <span class='kw'>return</span> <span class='self'>self</span>.<span class='ident'>basic_string</span>(<span class='ident'>start</span>).<span class='ident'>map</span>(<span class='prelude-val'>Some</span>),
<span class='prelude-val'>Some</span>((<span class='ident'>start</span>, <span class='ident'>ch</span>)) <span class='kw'>if</span> <span class='ident'>is_keylike</span>(<span class='ident'>ch</span>) <span class='op'>=></span> <span class='self'>self</span>.<span class='ident'>keylike</span>(<span class='ident'>start</span>),
<span class='prelude-val'>Some</span>((<span class='ident'>start</span>, <span class='ident'>ch</span>)) <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>Unexpected</span>(<span class='ident'>start</span>, <span class='ident'>ch</span>)),
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='prelude-val'>None</span>),
};
<span class='prelude-val'>Ok</span>(<span class='prelude-val'>Some</span>(<span class='ident'>token</span>))
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>peek</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>Token</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>>></span>, <span class='ident'>Error</span><span class='op'>></span> {
<span class='self'>self</span>.<span class='ident'>clone</span>().<span class='ident'>next</span>()
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>eat</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>expected</span>: <span class='ident'>Token</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>bool</span>, <span class='ident'>Error</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>peek</span>()<span class='question-mark'>?</span> {
<span class='prelude-val'>Some</span>(<span class='kw-2'>ref</span> <span class='ident'>found</span>) <span class='kw'>if</span> <span class='ident'>expected</span> <span class='op'>==</span> <span class='kw-2'>*</span><span class='ident'>found</span> <span class='op'>=></span> {}
<span class='prelude-val'>Some</span>(_) <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='bool-val'>false</span>),
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='bool-val'>false</span>),
}
<span class='ident'>drop</span>(<span class='self'>self</span>.<span class='ident'>next</span>());
<span class='prelude-val'>Ok</span>(<span class='bool-val'>true</span>)
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>expect</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>expected</span>: <span class='ident'>Token</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>Error</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='ident'>current</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>current</span>();
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>next</span>()<span class='question-mark'>?</span> {
<span class='prelude-val'>Some</span>(<span class='ident'>found</span>) <span class='op'>=></span> {
<span class='kw'>if</span> <span class='ident'>expected</span> <span class='op'>==</span> <span class='ident'>found</span> {
<span class='prelude-val'>Ok</span>(())
} <span class='kw'>else</span> {
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>Wanted</span> {
<span class='ident'>at</span>: <span class='ident'>current</span>,
<span class='ident'>expected</span>: <span class='ident'>expected</span>.<span class='ident'>describe</span>(),
<span class='ident'>found</span>: <span class='ident'>found</span>.<span class='ident'>describe</span>(),
})
}
}
<span class='prelude-val'>None</span> <span class='op'>=></span> {
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>Wanted</span> {
<span class='ident'>at</span>: <span class='self'>self</span>.<span class='ident'>input</span>.<span class='ident'>len</span>(),
<span class='ident'>expected</span>: <span class='ident'>expected</span>.<span class='ident'>describe</span>(),
<span class='ident'>found</span>: <span class='string'>"eof"</span>,
})
}
}
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>table_key</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>Cow</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>str</span><span class='op'>></span>, <span class='ident'>Error</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='ident'>current</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>current</span>();
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>next</span>()<span class='question-mark'>?</span> {
<span class='prelude-val'>Some</span>(<span class='ident'>Token</span>::<span class='ident'>Keylike</span>(<span class='ident'>k</span>)) <span class='op'>=></span> <span class='prelude-val'>Ok</span>(<span class='ident'>k</span>.<span class='ident'>into</span>()),
<span class='prelude-val'>Some</span>(<span class='ident'>Token</span>::<span class='ident'>String</span> { <span class='ident'>src</span>, <span class='ident'>val</span> }) <span class='op'>=></span> {
<span class='kw'>let</span> <span class='ident'>offset</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>substr_offset</span>(<span class='ident'>src</span>);
<span class='kw'>if</span> <span class='ident'>val</span> <span class='op'>==</span> <span class='string'>""</span> {
<span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>EmptyTableKey</span>(<span class='ident'>offset</span>))
}
<span class='kw'>match</span> <span class='ident'>src</span>.<span class='ident'>find</span>(<span class='string'>"\n"</span>) {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='prelude-val'>Ok</span>(<span class='ident'>val</span>),
<span class='prelude-val'>Some</span>(<span class='ident'>i</span>) <span class='op'>=></span> <span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>NewlineInTableKey</span>(<span class='ident'>offset</span> <span class='op'>+</span> <span class='ident'>i</span>)),
}
}
<span class='prelude-val'>Some</span>(<span class='ident'>other</span>) <span class='op'>=></span> {
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>Wanted</span> {
<span class='ident'>at</span>: <span class='ident'>current</span>,
<span class='ident'>expected</span>: <span class='string'>"a table key"</span>,
<span class='ident'>found</span>: <span class='ident'>other</span>.<span class='ident'>describe</span>(),
})
}
<span class='prelude-val'>None</span> <span class='op'>=></span> {
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>Wanted</span> {
<span class='ident'>at</span>: <span class='self'>self</span>.<span class='ident'>input</span>.<span class='ident'>len</span>(),
<span class='ident'>expected</span>: <span class='string'>"a table key"</span>,
<span class='ident'>found</span>: <span class='string'>"eof"</span>,
})
}
}
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>eat_whitespace</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>Error</span><span class='op'>></span> {
<span class='kw'>while</span> <span class='self'>self</span>.<span class='ident'>eatc</span>(<span class='string'>' '</span>) <span class='op'>||</span> <span class='self'>self</span>.<span class='ident'>eatc</span>(<span class='string'>'\t'</span>) {
<span class='comment'>// ...</span>
}
<span class='prelude-val'>Ok</span>(())
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>eat_comment</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>bool</span>, <span class='ident'>Error</span><span class='op'>></span> {
<span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>eatc</span>(<span class='string'>'#'</span>) {
<span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='bool-val'>false</span>)
}
<span class='ident'>drop</span>(<span class='self'>self</span>.<span class='ident'>comment_token</span>(<span class='number'>0</span>));
<span class='self'>self</span>.<span class='ident'>eat_newline_or_eof</span>().<span class='ident'>map</span>(<span class='op'>|</span>()<span class='op'>|</span> <span class='bool-val'>true</span>)
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>eat_newline_or_eof</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>Error</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='ident'>current</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>current</span>();
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>next</span>()<span class='question-mark'>?</span> {
<span class='prelude-val'>None</span> <span class='op'>|</span>
<span class='prelude-val'>Some</span>(<span class='ident'>Token</span>::<span class='ident'>Newline</span>) <span class='op'>=></span> <span class='prelude-val'>Ok</span>(()),
<span class='prelude-val'>Some</span>(<span class='ident'>other</span>) <span class='op'>=></span> {
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>Wanted</span> {
<span class='ident'>at</span>: <span class='ident'>current</span>,
<span class='ident'>expected</span>: <span class='string'>"newline"</span>,
<span class='ident'>found</span>: <span class='ident'>other</span>.<span class='ident'>describe</span>(),
})
}
}
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>skip_to_newline</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
<span class='kw'>loop</span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>((_, <span class='string'>'\n'</span>)) <span class='op'>|</span>
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>break</span>,
_ <span class='op'>=></span> {}
}
}
}
<span class='kw'>fn</span> <span class='ident'>eatc</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>ch</span>: <span class='ident'>char</span>) <span class='op'>-></span> <span class='ident'>bool</span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>clone</span>().<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>((_, <span class='ident'>ch2</span>)) <span class='kw'>if</span> <span class='ident'>ch</span> <span class='op'>==</span> <span class='ident'>ch2</span> <span class='op'>=></span> {
<span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>next</span>();
<span class='bool-val'>true</span>
}
_ <span class='op'>=></span> <span class='bool-val'>false</span>,
}
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>current</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>usize</span> {
<span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>clone</span>().<span class='ident'>next</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> <span class='ident'>i</span>.<span class='number'>0</span>).<span class='ident'>unwrap_or</span>(<span class='self'>self</span>.<span class='ident'>input</span>.<span class='ident'>len</span>())
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>input</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span> {
<span class='self'>self</span>.<span class='ident'>input</span>
}
<span class='kw'>fn</span> <span class='ident'>whitespace_token</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>start</span>: <span class='ident'>usize</span>) <span class='op'>-></span> <span class='ident'>Token</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='kw'>while</span> <span class='self'>self</span>.<span class='ident'>eatc</span>(<span class='string'>' '</span>) <span class='op'>||</span> <span class='self'>self</span>.<span class='ident'>eatc</span>(<span class='string'>'\t'</span>) {
<span class='comment'>// ...</span>
}
<span class='ident'>Whitespace</span>(<span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>input</span>[<span class='ident'>start</span>..<span class='self'>self</span>.<span class='ident'>current</span>()])
}
<span class='kw'>fn</span> <span class='ident'>comment_token</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>start</span>: <span class='ident'>usize</span>) <span class='op'>-></span> <span class='ident'>Token</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='kw'>while</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>((_, <span class='ident'>ch</span>)) <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>clone</span>().<span class='ident'>next</span>() {
<span class='kw'>if</span> <span class='ident'>ch</span> <span class='op'>!=</span> <span class='string'>'\t'</span> <span class='op'>&&</span> (<span class='ident'>ch</span> <span class='op'><</span> <span class='string'>'\u{20}'</span> <span class='op'>||</span> <span class='ident'>ch</span> <span class='op'>></span> <span class='string'>'\u{10ffff}'</span>) {
<span class='kw'>break</span>
}
<span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>next</span>();
}
<span class='ident'>Comment</span>(<span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>input</span>[<span class='ident'>start</span>..<span class='self'>self</span>.<span class='ident'>current</span>()])
}
<span class='kw'>fn</span> <span class='ident'>read_string</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>,
<span class='ident'>delim</span>: <span class='ident'>char</span>,
<span class='ident'>start</span>: <span class='ident'>usize</span>,
<span class='ident'>new_ch</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>FnMut</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>Tokenizer</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>MaybeString</span>,
<span class='ident'>bool</span>, <span class='ident'>usize</span>, <span class='ident'>char</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>Error</span><span class='op'>></span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>Token</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>, <span class='ident'>Error</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>multiline</span> <span class='op'>=</span> <span class='bool-val'>false</span>;
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eatc</span>(<span class='ident'>delim</span>) {
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>eatc</span>(<span class='ident'>delim</span>) {
<span class='ident'>multiline</span> <span class='op'>=</span> <span class='bool-val'>true</span>;
} <span class='kw'>else</span> {
<span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>String</span> {
<span class='ident'>src</span>: <span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>input</span>[<span class='ident'>start</span>..<span class='ident'>start</span><span class='op'>+</span><span class='number'>2</span>],
<span class='ident'>val</span>: <span class='ident'>Cow</span>::<span class='ident'>Borrowed</span>(<span class='string'>""</span>),
})
}
}
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>val</span> <span class='op'>=</span> <span class='ident'>MaybeString</span>::<span class='ident'>NotEscaped</span>(<span class='self'>self</span>.<span class='ident'>current</span>());
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='lifetime'>'outer</span>: <span class='kw'>loop</span> {
<span class='ident'>n</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>((<span class='ident'>i</span>, <span class='string'>'\n'</span>)) <span class='op'>=></span> {
<span class='kw'>if</span> <span class='ident'>multiline</span> {
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>input</span>.<span class='ident'>as_bytes</span>()[<span class='ident'>i</span>] <span class='op'>==</span> <span class='string'>b'\r'</span> {
<span class='ident'>val</span>.<span class='ident'>to_owned</span>(<span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>input</span>[..<span class='ident'>i</span>]);
}
<span class='kw'>if</span> <span class='ident'>n</span> <span class='op'>==</span> <span class='number'>1</span> {
<span class='ident'>val</span> <span class='op'>=</span> <span class='ident'>MaybeString</span>::<span class='ident'>NotEscaped</span>(<span class='self'>self</span>.<span class='ident'>current</span>());
} <span class='kw'>else</span> {
<span class='ident'>val</span>.<span class='ident'>push</span>(<span class='string'>'\n'</span>);
}
<span class='kw'>continue</span>
} <span class='kw'>else</span> {
<span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>NewlineInString</span>(<span class='ident'>i</span>))
}
}
<span class='prelude-val'>Some</span>((<span class='ident'>i</span>, <span class='ident'>ch</span>)) <span class='kw'>if</span> <span class='ident'>ch</span> <span class='op'>==</span> <span class='ident'>delim</span> <span class='op'>=></span> {
<span class='kw'>if</span> <span class='ident'>multiline</span> {
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>2</span> {
<span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>eatc</span>(<span class='ident'>delim</span>) {
<span class='ident'>val</span>.<span class='ident'>push</span>(<span class='ident'>delim</span>);
<span class='kw'>continue</span> <span class='lifetime'>'outer</span>
}
}
}
<span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>String</span> {
<span class='ident'>src</span>: <span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>input</span>[<span class='ident'>start</span>..<span class='self'>self</span>.<span class='ident'>current</span>()],
<span class='ident'>val</span>: <span class='ident'>val</span>.<span class='ident'>into_cow</span>(<span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>input</span>[..<span class='ident'>i</span>]),
})
}
<span class='prelude-val'>Some</span>((<span class='ident'>i</span>, <span class='ident'>c</span>)) <span class='op'>=></span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>new_ch</span>(<span class='self'>self</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>val</span>, <span class='ident'>multiline</span>, <span class='ident'>i</span>, <span class='ident'>c</span>)),
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>UnterminatedString</span>(<span class='ident'>start</span>))
}
}
}
<span class='kw'>fn</span> <span class='ident'>literal_string</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>start</span>: <span class='ident'>usize</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>Token</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>, <span class='ident'>Error</span><span class='op'>></span> {
<span class='self'>self</span>.<span class='ident'>read_string</span>(<span class='string'>'\''</span>, <span class='ident'>start</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>|</span><span class='ident'>_me</span>, <span class='ident'>val</span>, <span class='ident'>_multi</span>, <span class='ident'>i</span>, <span class='ident'>ch</span><span class='op'>|</span> {
<span class='kw'>if</span> <span class='ident'>ch</span> <span class='op'>==</span> <span class='string'>'\u{09}'</span> <span class='op'>||</span> (<span class='string'>'\u{20}'</span> <span class='op'><=</span> <span class='ident'>ch</span> <span class='op'>&&</span> <span class='ident'>ch</span> <span class='op'><=</span> <span class='string'>'\u{10ffff}'</span>) {
<span class='ident'>val</span>.<span class='ident'>push</span>(<span class='ident'>ch</span>);
<span class='prelude-val'>Ok</span>(())
} <span class='kw'>else</span> {
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>InvalidCharInString</span>(<span class='ident'>i</span>, <span class='ident'>ch</span>))
}
})
}
<span class='kw'>fn</span> <span class='ident'>basic_string</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>start</span>: <span class='ident'>usize</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>Token</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>, <span class='ident'>Error</span><span class='op'>></span> {
<span class='self'>self</span>.<span class='ident'>read_string</span>(<span class='string'>'"'</span>, <span class='ident'>start</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>|</span><span class='ident'>me</span>, <span class='ident'>val</span>, <span class='ident'>multi</span>, <span class='ident'>i</span>, <span class='ident'>ch</span><span class='op'>|</span> {
<span class='kw'>match</span> <span class='ident'>ch</span> {
<span class='string'>'\\'</span> <span class='op'>=></span> {
<span class='ident'>val</span>.<span class='ident'>to_owned</span>(<span class='kw-2'>&</span><span class='ident'>me</span>.<span class='ident'>input</span>[..<span class='ident'>i</span>]);
<span class='kw'>match</span> <span class='ident'>me</span>.<span class='ident'>chars</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>((_, <span class='string'>'"'</span>)) <span class='op'>=></span> <span class='ident'>val</span>.<span class='ident'>push</span>(<span class='string'>'"'</span>),
<span class='prelude-val'>Some</span>((_, <span class='string'>'\\'</span>)) <span class='op'>=></span> <span class='ident'>val</span>.<span class='ident'>push</span>(<span class='string'>'\\'</span>),
<span class='prelude-val'>Some</span>((_, <span class='string'>'b'</span>)) <span class='op'>=></span> <span class='ident'>val</span>.<span class='ident'>push</span>(<span class='string'>'\u{8}'</span>),
<span class='prelude-val'>Some</span>((_, <span class='string'>'f'</span>)) <span class='op'>=></span> <span class='ident'>val</span>.<span class='ident'>push</span>(<span class='string'>'\u{c}'</span>),
<span class='prelude-val'>Some</span>((_, <span class='string'>'n'</span>)) <span class='op'>=></span> <span class='ident'>val</span>.<span class='ident'>push</span>(<span class='string'>'\n'</span>),
<span class='prelude-val'>Some</span>((_, <span class='string'>'r'</span>)) <span class='op'>=></span> <span class='ident'>val</span>.<span class='ident'>push</span>(<span class='string'>'\r'</span>),
<span class='prelude-val'>Some</span>((_, <span class='string'>'t'</span>)) <span class='op'>=></span> <span class='ident'>val</span>.<span class='ident'>push</span>(<span class='string'>'\t'</span>),
<span class='prelude-val'>Some</span>((<span class='ident'>i</span>, <span class='ident'>c</span> @ <span class='string'>'u'</span>)) <span class='op'>|</span>
<span class='prelude-val'>Some</span>((<span class='ident'>i</span>, <span class='ident'>c</span> @ <span class='string'>'U'</span>)) <span class='op'>=></span> {
<span class='kw'>let</span> <span class='ident'>len</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'u'</span> {<span class='number'>4</span>} <span class='kw'>else</span> {<span class='number'>8</span>};
<span class='ident'>val</span>.<span class='ident'>push</span>(<span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>me</span>.<span class='ident'>hex</span>(<span class='ident'>start</span>, <span class='ident'>i</span>, <span class='ident'>len</span>)));
}
<span class='prelude-val'>Some</span>((_, <span class='string'>'\n'</span>)) <span class='kw'>if</span> <span class='ident'>multi</span> <span class='op'>=></span> {
<span class='kw'>while</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>((_, <span class='ident'>ch</span>)) <span class='op'>=</span> <span class='ident'>me</span>.<span class='ident'>chars</span>.<span class='ident'>clone</span>().<span class='ident'>next</span>() {
<span class='kw'>match</span> <span class='ident'>ch</span> {
<span class='string'>' '</span> <span class='op'>|</span> <span class='string'>'\t'</span> <span class='op'>|</span> <span class='string'>'\n'</span> <span class='op'>=></span> {
<span class='ident'>me</span>.<span class='ident'>chars</span>.<span class='ident'>next</span>();
}
_ <span class='op'>=></span> <span class='kw'>break</span>,
}
}
}
<span class='prelude-val'>Some</span>((<span class='ident'>i</span>, <span class='ident'>c</span>)) <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>InvalidEscape</span>(<span class='ident'>i</span>, <span class='ident'>c</span>)),
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>UnterminatedString</span>(<span class='ident'>start</span>)),
}
<span class='prelude-val'>Ok</span>(())
}
<span class='ident'>ch</span> <span class='kw'>if</span> <span class='string'>'\u{20}'</span> <span class='op'><=</span> <span class='ident'>ch</span> <span class='op'>&&</span> <span class='ident'>ch</span> <span class='op'><=</span> <span class='string'>'\u{10ffff}'</span> <span class='op'>=></span> {
<span class='ident'>val</span>.<span class='ident'>push</span>(<span class='ident'>ch</span>);
<span class='prelude-val'>Ok</span>(())
}
_ <span class='op'>=></span> <span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>InvalidCharInString</span>(<span class='ident'>i</span>, <span class='ident'>ch</span>))
}
})
}
<span class='kw'>fn</span> <span class='ident'>hex</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>start</span>: <span class='ident'>usize</span>, <span class='ident'>i</span>: <span class='ident'>usize</span>, <span class='ident'>len</span>: <span class='ident'>usize</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>char</span>, <span class='ident'>Error</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>val</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='ident'>len</span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>((_, <span class='ident'>ch</span>)) <span class='kw'>if</span> <span class='string'>'0'</span> <span class='op'><=</span> <span class='ident'>ch</span> <span class='op'>&&</span> <span class='ident'>ch</span> <span class='op'><=</span> <span class='string'>'9'</span> <span class='op'>=></span> {
<span class='ident'>val</span> <span class='op'>=</span> <span class='ident'>val</span> <span class='op'>*</span> <span class='number'>16</span> <span class='op'>+</span> (<span class='ident'>ch</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>-</span> <span class='string'>'0'</span> <span class='kw'>as</span> <span class='ident'>u32</span>);
}
<span class='prelude-val'>Some</span>((_, <span class='ident'>ch</span>)) <span class='kw'>if</span> <span class='string'>'A'</span> <span class='op'><=</span> <span class='ident'>ch</span> <span class='op'>&&</span> <span class='ident'>ch</span> <span class='op'><=</span> <span class='string'>'F'</span> <span class='op'>=></span> {
<span class='ident'>val</span> <span class='op'>=</span> <span class='ident'>val</span> <span class='op'>*</span> <span class='number'>16</span> <span class='op'>+</span> (<span class='ident'>ch</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>-</span> <span class='string'>'A'</span> <span class='kw'>as</span> <span class='ident'>u32</span>) <span class='op'>+</span> <span class='number'>10</span>;
}
<span class='prelude-val'>Some</span>((<span class='ident'>i</span>, <span class='ident'>ch</span>)) <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>InvalidHexEscape</span>(<span class='ident'>i</span>, <span class='ident'>ch</span>)),
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>UnterminatedString</span>(<span class='ident'>start</span>)),
}
}
<span class='kw'>match</span> <span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>val</span>) {
<span class='prelude-val'>Some</span>(<span class='ident'>ch</span>) <span class='op'>=></span> <span class='prelude-val'>Ok</span>(<span class='ident'>ch</span>),
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>InvalidEscapeValue</span>(<span class='ident'>i</span>, <span class='ident'>val</span>)),
}
}
<span class='kw'>fn</span> <span class='ident'>keylike</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>start</span>: <span class='ident'>usize</span>) <span class='op'>-></span> <span class='ident'>Token</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='kw'>while</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>((_, <span class='ident'>ch</span>)) <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>clone</span>().<span class='ident'>next</span>() {
<span class='kw'>if</span> <span class='op'>!</span><span class='ident'>is_keylike</span>(<span class='ident'>ch</span>) {
<span class='kw'>break</span>
}
<span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>next</span>();
}
<span class='ident'>Keylike</span>(<span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>input</span>[<span class='ident'>start</span>..<span class='self'>self</span>.<span class='ident'>current</span>()])
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>substr_offset</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>s</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span>) <span class='op'>-></span> <span class='ident'>usize</span> {
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>len</span>() <span class='op'><=</span> <span class='self'>self</span>.<span class='ident'>input</span>.<span class='ident'>len</span>());
<span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>input</span>.<span class='ident'>as_ptr</span>() <span class='kw'>as</span> <span class='ident'>usize</span>;
<span class='kw'>let</span> <span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>as_ptr</span>() <span class='kw'>as</span> <span class='ident'>usize</span>;
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>a</span> <span class='op'><=</span> <span class='ident'>b</span>);
<span class='ident'>b</span> <span class='op'>-</span> <span class='ident'>a</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'>CrlfFold</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'>usize</span>, <span class='ident'>char</span>);
<span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span>(<span class='ident'>usize</span>, <span class='ident'>char</span>)<span class='op'>></span> {
<span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>next</span>().<span class='ident'>map</span>(<span class='op'>|</span>(<span class='ident'>i</span>, <span class='ident'>c</span>)<span class='op'>|</span> {
<span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'\r'</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>attempt</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>chars</span>.<span class='ident'>clone</span>();
<span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>((_, <span class='string'>'\n'</span>)) <span class='op'>=</span> <span class='ident'>attempt</span>.<span class='ident'>next</span>() {
<span class='self'>self</span>.<span class='ident'>chars</span> <span class='op'>=</span> <span class='ident'>attempt</span>;
<span class='kw'>return</span> (<span class='ident'>i</span>, <span class='string'>'\n'</span>)
}
}
(<span class='ident'>i</span>, <span class='ident'>c</span>)
})
}
}
<span class='kw'>impl</span> <span class='ident'>MaybeString</span> {
<span class='kw'>fn</span> <span class='ident'>push</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>ch</span>: <span class='ident'>char</span>) {
<span class='kw'>match</span> <span class='kw-2'>*</span><span class='self'>self</span> {
<span class='ident'>MaybeString</span>::<span class='ident'>NotEscaped</span>(..) <span class='op'>=></span> {}
<span class='ident'>MaybeString</span>::<span class='ident'>Owned</span>(<span class='kw-2'>ref</span> <span class='kw-2'>mut</span> <span class='ident'>s</span>) <span class='op'>=></span> <span class='ident'>s</span>.<span class='ident'>push</span>(<span class='ident'>ch</span>),
}
}
<span class='kw'>fn</span> <span class='ident'>to_owned</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>input</span>: <span class='kw-2'>&</span><span class='ident'>str</span>) {
<span class='kw'>match</span> <span class='kw-2'>*</span><span class='self'>self</span> {
<span class='ident'>MaybeString</span>::<span class='ident'>NotEscaped</span>(<span class='ident'>start</span>) <span class='op'>=></span> {
<span class='kw-2'>*</span><span class='self'>self</span> <span class='op'>=</span> <span class='ident'>MaybeString</span>::<span class='ident'>Owned</span>(<span class='ident'>input</span>[<span class='ident'>start</span>..].<span class='ident'>to_owned</span>());
}
<span class='ident'>MaybeString</span>::<span class='ident'>Owned</span>(..) <span class='op'>=></span> {}
}
}
<span class='kw'>fn</span> <span class='ident'>into_cow</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>input</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span>) <span class='op'>-></span> <span class='ident'>Cow</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>str</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span> {
<span class='ident'>MaybeString</span>::<span class='ident'>NotEscaped</span>(<span class='ident'>start</span>) <span class='op'>=></span> <span class='ident'>Cow</span>::<span class='ident'>Borrowed</span>(<span class='kw-2'>&</span><span class='ident'>input</span>[<span class='ident'>start</span>..]),
<span class='ident'>MaybeString</span>::<span class='ident'>Owned</span>(<span class='ident'>s</span>) <span class='op'>=></span> <span class='ident'>Cow</span>::<span class='ident'>Owned</span>(<span class='ident'>s</span>),
}
}
}
<span class='kw'>fn</span> <span class='ident'>is_keylike</span>(<span class='ident'>ch</span>: <span class='ident'>char</span>) <span class='op'>-></span> <span class='ident'>bool</span> {
(<span class='string'>'A'</span> <span class='op'><=</span> <span class='ident'>ch</span> <span class='op'>&&</span> <span class='ident'>ch</span> <span class='op'><=</span> <span class='string'>'Z'</span>) <span class='op'>||</span>
(<span class='string'>'a'</span> <span class='op'><=</span> <span class='ident'>ch</span> <span class='op'>&&</span> <span class='ident'>ch</span> <span class='op'><=</span> <span class='string'>'z'</span>) <span class='op'>||</span>
(<span class='string'>'0'</span> <span class='op'><=</span> <span class='ident'>ch</span> <span class='op'>&&</span> <span class='ident'>ch</span> <span class='op'><=</span> <span class='string'>'9'</span>) <span class='op'>||</span>
<span class='ident'>ch</span> <span class='op'>==</span> <span class='string'>'-'</span> <span class='op'>||</span>
<span class='ident'>ch</span> <span class='op'>==</span> <span class='string'>'_'</span>
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> <span class='ident'>Token</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>describe</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span> {
<span class='kw'>match</span> <span class='kw-2'>*</span><span class='self'>self</span> {
<span class='ident'>Token</span>::<span class='ident'>Keylike</span>(_) <span class='op'>=></span> <span class='string'>"an identifier"</span>,
<span class='ident'>Token</span>::<span class='ident'>Equals</span> <span class='op'>=></span> <span class='string'>"an equals"</span>,
<span class='ident'>Token</span>::<span class='ident'>Period</span> <span class='op'>=></span> <span class='string'>"a period"</span>,
<span class='ident'>Token</span>::<span class='ident'>Comment</span>(_) <span class='op'>=></span> <span class='string'>"a comment"</span>,
<span class='ident'>Token</span>::<span class='ident'>Newline</span> <span class='op'>=></span> <span class='string'>"a newline"</span>,
<span class='ident'>Token</span>::<span class='ident'>Whitespace</span>(_) <span class='op'>=></span> <span class='string'>"whitespace"</span>,
<span class='ident'>Token</span>::<span class='ident'>Comma</span> <span class='op'>=></span> <span class='string'>"a comma"</span>,
<span class='ident'>Token</span>::<span class='ident'>RightBrace</span> <span class='op'>=></span> <span class='string'>"a right brace"</span>,
<span class='ident'>Token</span>::<span class='ident'>LeftBrace</span> <span class='op'>=></span> <span class='string'>"a left brace"</span>,
<span class='ident'>Token</span>::<span class='ident'>RightBracket</span> <span class='op'>=></span> <span class='string'>"a right bracket"</span>,
<span class='ident'>Token</span>::<span class='ident'>LeftBracket</span> <span class='op'>=></span> <span class='string'>"a left bracket"</span>,
<span class='ident'>Token</span>::<span class='ident'>String</span> { .. } <span class='op'>=></span> <span class='string'>"a string"</span>,
<span class='ident'>Token</span>::<span class='ident'>Colon</span> <span class='op'>=></span> <span class='string'>"a colon"</span>,
<span class='ident'>Token</span>::<span class='ident'>Plus</span> <span class='op'>=></span> <span class='string'>"a plus"</span>,
}
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>tests</span> {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>borrow</span>::<span class='ident'>Cow</span>;
<span class='kw'>use</span> <span class='kw'>super</span>::{<span class='ident'>Tokenizer</span>, <span class='ident'>Token</span>, <span class='ident'>Error</span>};
<span class='kw'>fn</span> <span class='ident'>err</span>(<span class='ident'>input</span>: <span class='kw-2'>&</span><span class='ident'>str</span>, <span class='ident'>err</span>: <span class='ident'>Error</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>t</span> <span class='op'>=</span> <span class='ident'>Tokenizer</span>::<span class='ident'>new</span>(<span class='ident'>input</span>);
<span class='kw'>let</span> <span class='ident'>token</span> <span class='op'>=</span> <span class='ident'>t</span>.<span class='ident'>next</span>().<span class='ident'>unwrap_err</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>token</span>, <span class='ident'>err</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>t</span>.<span class='ident'>next</span>().<span class='ident'>unwrap</span>().<span class='ident'>is_none</span>());
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>literal_strings</span>() {
<span class='kw'>fn</span> <span class='ident'>t</span>(<span class='ident'>input</span>: <span class='kw-2'>&</span><span class='ident'>str</span>, <span class='ident'>val</span>: <span class='kw-2'>&</span><span class='ident'>str</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>t</span> <span class='op'>=</span> <span class='ident'>Tokenizer</span>::<span class='ident'>new</span>(<span class='ident'>input</span>);
<span class='kw'>let</span> <span class='ident'>token</span> <span class='op'>=</span> <span class='ident'>t</span>.<span class='ident'>next</span>().<span class='ident'>unwrap</span>().<span class='ident'>unwrap</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>token</span>, <span class='ident'>Token</span>::<span class='ident'>String</span> {
<span class='ident'>src</span>: <span class='ident'>input</span>,
<span class='ident'>val</span>: <span class='ident'>Cow</span>::<span class='ident'>Borrowed</span>(<span class='ident'>val</span>),
});
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>t</span>.<span class='ident'>next</span>().<span class='ident'>unwrap</span>().<span class='ident'>is_none</span>());
}
<span class='ident'>t</span>(<span class='string'>"''"</span>, <span class='string'>""</span>);
<span class='ident'>t</span>(<span class='string'>"''''''"</span>, <span class='string'>""</span>);
<span class='ident'>t</span>(<span class='string'>"'''\n'''"</span>, <span class='string'>""</span>);
<span class='ident'>t</span>(<span class='string'>"'a'"</span>, <span class='string'>"a"</span>);
<span class='ident'>t</span>(<span class='string'>"'\"a'"</span>, <span class='string'>"\"a"</span>);
<span class='ident'>t</span>(<span class='string'>"''''a'''"</span>, <span class='string'>"'a"</span>);
<span class='ident'>t</span>(<span class='string'>"'''\n'a\n'''"</span>, <span class='string'>"'a\n"</span>);
<span class='ident'>t</span>(<span class='string'>"'''a\n'a\r\n'''"</span>, <span class='string'>"a\n'a\n"</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>basic_strings</span>() {
<span class='kw'>fn</span> <span class='ident'>t</span>(<span class='ident'>input</span>: <span class='kw-2'>&</span><span class='ident'>str</span>, <span class='ident'>val</span>: <span class='kw-2'>&</span><span class='ident'>str</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>t</span> <span class='op'>=</span> <span class='ident'>Tokenizer</span>::<span class='ident'>new</span>(<span class='ident'>input</span>);
<span class='kw'>let</span> <span class='ident'>token</span> <span class='op'>=</span> <span class='ident'>t</span>.<span class='ident'>next</span>().<span class='ident'>unwrap</span>().<span class='ident'>unwrap</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>token</span>, <span class='ident'>Token</span>::<span class='ident'>String</span> {
<span class='ident'>src</span>: <span class='ident'>input</span>,
<span class='ident'>val</span>: <span class='ident'>Cow</span>::<span class='ident'>Borrowed</span>(<span class='ident'>val</span>),
});
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>t</span>.<span class='ident'>next</span>().<span class='ident'>unwrap</span>().<span class='ident'>is_none</span>());
}
<span class='ident'>t</span>(<span class='string'>r#""""#</span>, <span class='string'>""</span>);
<span class='ident'>t</span>(<span class='string'>r#""""""""#</span>, <span class='string'>""</span>);
<span class='ident'>t</span>(<span class='string'>r#""a""#</span>, <span class='string'>"a"</span>);
<span class='ident'>t</span>(<span class='string'>r#""""a""""#</span>, <span class='string'>"a"</span>);
<span class='ident'>t</span>(<span class='string'>r#""\t""#</span>, <span class='string'>"\t"</span>);
<span class='ident'>t</span>(<span class='string'>r#""\u0000""#</span>, <span class='string'>"\0"</span>);
<span class='ident'>t</span>(<span class='string'>r#""\U00000000""#</span>, <span class='string'>"\0"</span>);
<span class='ident'>t</span>(<span class='string'>r#""\U000A0000""#</span>, <span class='string'>"\u{A0000}"</span>);
<span class='ident'>t</span>(<span class='string'>r#""\\t""#</span>, <span class='string'>"\\t"</span>);
<span class='ident'>t</span>(<span class='string'>"\"\"\"\\\n\"\"\""</span>, <span class='string'>""</span>);
<span class='ident'>t</span>(<span class='string'>"\"\"\"\\\n \t \t \\\r\n \t \n \t \r\n\"\"\""</span>, <span class='string'>""</span>);
<span class='ident'>t</span>(<span class='string'>r#""\r""#</span>, <span class='string'>"\r"</span>);
<span class='ident'>t</span>(<span class='string'>r#""\n""#</span>, <span class='string'>"\n"</span>);
<span class='ident'>t</span>(<span class='string'>r#""\b""#</span>, <span class='string'>"\u{8}"</span>);
<span class='ident'>t</span>(<span class='string'>r#""a\fa""#</span>, <span class='string'>"a\u{c}a"</span>);
<span class='ident'>t</span>(<span class='string'>r#""\"a""#</span>, <span class='string'>"\"a"</span>);
<span class='ident'>t</span>(<span class='string'>"\"\"\"\na\"\"\""</span>, <span class='string'>"a"</span>);
<span class='ident'>t</span>(<span class='string'>"\"\"\"\n\"\"\""</span>, <span class='string'>""</span>);
<span class='ident'>err</span>(<span class='string'>r#""\a"#</span>, <span class='ident'>Error</span>::<span class='ident'>InvalidEscape</span>(<span class='number'>2</span>, <span class='string'>'a'</span>));
<span class='ident'>err</span>(<span class='string'>"\"\\\n"</span>, <span class='ident'>Error</span>::<span class='ident'>InvalidEscape</span>(<span class='number'>2</span>, <span class='string'>'\n'</span>));
<span class='ident'>err</span>(<span class='string'>"\"\\\r\n"</span>, <span class='ident'>Error</span>::<span class='ident'>InvalidEscape</span>(<span class='number'>2</span>, <span class='string'>'\n'</span>));
<span class='ident'>err</span>(<span class='string'>"\"\\"</span>, <span class='ident'>Error</span>::<span class='ident'>UnterminatedString</span>(<span class='number'>0</span>));
<span class='ident'>err</span>(<span class='string'>"\"\u{0}"</span>, <span class='ident'>Error</span>::<span class='ident'>InvalidCharInString</span>(<span class='number'>1</span>, <span class='string'>'\u{0}'</span>));
<span class='ident'>err</span>(<span class='string'>r#""\U00""#</span>, <span class='ident'>Error</span>::<span class='ident'>InvalidHexEscape</span>(<span class='number'>5</span>, <span class='string'>'"'</span>));
<span class='ident'>err</span>(<span class='string'>r#""\U00"#</span>, <span class='ident'>Error</span>::<span class='ident'>UnterminatedString</span>(<span class='number'>0</span>));
<span class='ident'>err</span>(<span class='string'>r#""\uD800"#</span>, <span class='ident'>Error</span>::<span class='ident'>InvalidEscapeValue</span>(<span class='number'>2</span>, <span class='number'>0xd800</span>));
<span class='ident'>err</span>(<span class='string'>r#""\UFFFFFFFF"#</span>, <span class='ident'>Error</span>::<span class='ident'>InvalidEscapeValue</span>(<span class='number'>2</span>, <span class='number'>0xffffffff</span>));
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>keylike</span>() {
<span class='kw'>fn</span> <span class='ident'>t</span>(<span class='ident'>input</span>: <span class='kw-2'>&</span><span class='ident'>str</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>t</span> <span class='op'>=</span> <span class='ident'>Tokenizer</span>::<span class='ident'>new</span>(<span class='ident'>input</span>);
<span class='kw'>let</span> <span class='ident'>token</span> <span class='op'>=</span> <span class='ident'>t</span>.<span class='ident'>next</span>().<span class='ident'>unwrap</span>().<span class='ident'>unwrap</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>token</span>, <span class='ident'>Token</span>::<span class='ident'>Keylike</span>(<span class='ident'>input</span>));
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>t</span>.<span class='ident'>next</span>().<span class='ident'>unwrap</span>().<span class='ident'>is_none</span>());
}
<span class='ident'>t</span>(<span class='string'>"foo"</span>);
<span class='ident'>t</span>(<span class='string'>"0bar"</span>);
<span class='ident'>t</span>(<span class='string'>"bar0"</span>);
<span class='ident'>t</span>(<span class='string'>"1234"</span>);
<span class='ident'>t</span>(<span class='string'>"a-b"</span>);
<span class='ident'>t</span>(<span class='string'>"a_B"</span>);
<span class='ident'>t</span>(<span class='string'>"-_-"</span>);
<span class='ident'>t</span>(<span class='string'>"___"</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>all</span>() {
<span class='kw'>fn</span> <span class='ident'>t</span>(<span class='ident'>input</span>: <span class='kw-2'>&</span><span class='ident'>str</span>, <span class='ident'>expected</span>: <span class='kw-2'>&</span>[<span class='ident'>Token</span>]) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>tokens</span> <span class='op'>=</span> <span class='ident'>Tokenizer</span>::<span class='ident'>new</span>(<span class='ident'>input</span>);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>actual</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>new</span>();
<span class='kw'>while</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>token</span>) <span class='op'>=</span> <span class='ident'>tokens</span>.<span class='ident'>next</span>().<span class='ident'>unwrap</span>() {
<span class='ident'>actual</span>.<span class='ident'>push</span>(<span class='ident'>token</span>);
}
<span class='kw'>for</span> (<span class='ident'>a</span>, <span class='ident'>b</span>) <span class='kw'>in</span> <span class='ident'>actual</span>.<span class='ident'>iter</span>().<span class='ident'>zip</span>(<span class='ident'>expected</span>) {
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>a</span>, <span class='ident'>b</span>);
}
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>actual</span>.<span class='ident'>len</span>(), <span class='ident'>expected</span>.<span class='ident'>len</span>());
}
<span class='ident'>t</span>(<span class='string'>" a "</span>, <span class='kw-2'>&</span>[
<span class='ident'>Token</span>::<span class='ident'>Whitespace</span>(<span class='string'>" "</span>),
<span class='ident'>Token</span>::<span class='ident'>Keylike</span>(<span class='string'>"a"</span>),
<span class='ident'>Token</span>::<span class='ident'>Whitespace</span>(<span class='string'>" "</span>),
]);
<span class='ident'>t</span>(<span class='string'>" a\t [[]] \t [] {} , . =\n# foo \r\n#foo \n "</span>, <span class='kw-2'>&</span>[
<span class='ident'>Token</span>::<span class='ident'>Whitespace</span>(<span class='string'>" "</span>),
<span class='ident'>Token</span>::<span class='ident'>Keylike</span>(<span class='string'>"a"</span>),
<span class='ident'>Token</span>::<span class='ident'>Whitespace</span>(<span class='string'>"\t "</span>),
<span class='ident'>Token</span>::<span class='ident'>LeftBracket</span>,
<span class='ident'>Token</span>::<span class='ident'>LeftBracket</span>,
<span class='ident'>Token</span>::<span class='ident'>RightBracket</span>,
<span class='ident'>Token</span>::<span class='ident'>RightBracket</span>,
<span class='ident'>Token</span>::<span class='ident'>Whitespace</span>(<span class='string'>" \t "</span>),
<span class='ident'>Token</span>::<span class='ident'>LeftBracket</span>,
<span class='ident'>Token</span>::<span class='ident'>RightBracket</span>,
<span class='ident'>Token</span>::<span class='ident'>Whitespace</span>(<span class='string'>" "</span>),
<span class='ident'>Token</span>::<span class='ident'>LeftBrace</span>,
<span class='ident'>Token</span>::<span class='ident'>RightBrace</span>,
<span class='ident'>Token</span>::<span class='ident'>Whitespace</span>(<span class='string'>" "</span>),
<span class='ident'>Token</span>::<span class='ident'>Comma</span>,
<span class='ident'>Token</span>::<span class='ident'>Whitespace</span>(<span class='string'>" "</span>),
<span class='ident'>Token</span>::<span class='ident'>Period</span>,
<span class='ident'>Token</span>::<span class='ident'>Whitespace</span>(<span class='string'>" "</span>),
<span class='ident'>Token</span>::<span class='ident'>Equals</span>,
<span class='ident'>Token</span>::<span class='ident'>Newline</span>,
<span class='ident'>Token</span>::<span class='ident'>Comment</span>(<span class='string'>"# foo "</span>),
<span class='ident'>Token</span>::<span class='ident'>Newline</span>,
<span class='ident'>Token</span>::<span class='ident'>Comment</span>(<span class='string'>"#foo "</span>),
<span class='ident'>Token</span>::<span class='ident'>Newline</span>,
<span class='ident'>Token</span>::<span class='ident'>Whitespace</span>(<span class='string'>" "</span>),
]);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>bare_cr_bad</span>() {
<span class='ident'>err</span>(<span class='string'>"\r"</span>, <span class='ident'>Error</span>::<span class='ident'>Unexpected</span>(<span class='number'>0</span>, <span class='string'>'\r'</span>));
<span class='ident'>err</span>(<span class='string'>"'\n"</span>, <span class='ident'>Error</span>::<span class='ident'>NewlineInString</span>(<span class='number'>1</span>));
<span class='ident'>err</span>(<span class='string'>"'\u{0}"</span>, <span class='ident'>Error</span>::<span class='ident'>InvalidCharInString</span>(<span class='number'>1</span>, <span class='string'>'\u{0}'</span>));
<span class='ident'>err</span>(<span class='string'>"'"</span>, <span class='ident'>Error</span>::<span class='ident'>UnterminatedString</span>(<span class='number'>0</span>));
<span class='ident'>err</span>(<span class='string'>"\u{0}"</span>, <span class='ident'>Error</span>::<span class='ident'>Unexpected</span>(<span class='number'>0</span>, <span class='string'>'\u{0}'</span>));
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>bad_comment</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>t</span> <span class='op'>=</span> <span class='ident'>Tokenizer</span>::<span class='ident'>new</span>(<span class='string'>"#\u{0}"</span>);
<span class='ident'>t</span>.<span class='ident'>next</span>().<span class='ident'>unwrap</span>().<span class='ident'>unwrap</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>t</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>Unexpected</span>(<span class='number'>1</span>, <span class='string'>'\u{0}'</span>)));
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>t</span>.<span class='ident'>next</span>().<span class='ident'>unwrap</span>().<span class='ident'>is_none</span>());
}
}
</pre>
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