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<span class='doccomment'>//! Module that contains helper iterators.</span>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>iter</span>::<span class='ident'>Peekable</span>;
<span class='doccomment'>/// Iterator over a byte stream that tracks the current position's line and column.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>LineColIterator</span><span class='op'><</span><span class='ident'>Iter</span>: <span class='ident'>Iterator</span><span class='op'><</span><span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>>></span><span class='op'>></span> {
<span class='ident'>iter</span>: <span class='ident'>Iter</span>,
<span class='ident'>line</span>: <span class='ident'>usize</span>,
<span class='ident'>col</span>: <span class='ident'>usize</span>,
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>Iter</span>: <span class='ident'>Iterator</span><span class='op'><</span><span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>>></span><span class='op'>></span> <span class='ident'>LineColIterator</span><span class='op'><</span><span class='ident'>Iter</span><span class='op'>></span> {
<span class='doccomment'>/// Construct a new `LineColIterator<Iter>`.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>iter</span>: <span class='ident'>Iter</span>) <span class='op'>-></span> <span class='ident'>LineColIterator</span><span class='op'><</span><span class='ident'>Iter</span><span class='op'>></span> {
<span class='ident'>LineColIterator</span> {
<span class='ident'>iter</span>: <span class='ident'>iter</span>,
<span class='ident'>line</span>: <span class='number'>1</span>,
<span class='ident'>col</span>: <span class='number'>0</span>,
}
}
<span class='doccomment'>/// Report the current line inside the iterator.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>line</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>usize</span> {
<span class='self'>self</span>.<span class='ident'>line</span>
}
<span class='doccomment'>/// Report the current column inside the iterator.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>col</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>usize</span> {
<span class='self'>self</span>.<span class='ident'>col</span>
}
<span class='doccomment'>/// Gets a reference to the underlying iterator.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>get_ref</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>Iter</span> {
<span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>iter</span>
}
<span class='doccomment'>/// Gets a mutable reference to the underlying iterator.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>get_mut</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>Iter</span> {
<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>.<span class='ident'>iter</span>
}
<span class='doccomment'>/// Unwraps this `LineColIterator`, returning the underlying iterator.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>into_inner</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>Iter</span> {
<span class='self'>self</span>.<span class='ident'>iter</span>
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>Iter</span>: <span class='ident'>Iterator</span><span class='op'><</span><span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>>></span><span class='op'>></span> <span class='ident'>LineColIterator</span><span class='op'><</span><span class='ident'>Peekable</span><span class='op'><</span><span class='ident'>Iter</span><span class='op'>>></span> {
<span class='doccomment'>/// peeks at the next value</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'>Option</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>>></span> {
<span class='self'>self</span>.<span class='ident'>iter</span>.<span class='ident'>peek</span>()
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>Iter</span>: <span class='ident'>Iterator</span><span class='op'><</span><span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>>></span><span class='op'>></span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>LineColIterator</span><span class='op'><</span><span class='ident'>Iter</span><span class='op'>></span> {
<span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></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'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>iter</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='prelude-val'>None</span>,
<span class='prelude-val'>Some</span>(<span class='prelude-val'>Ok</span>(<span class='string'>b'\n'</span>)) <span class='op'>=></span> {
<span class='self'>self</span>.<span class='ident'>line</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='self'>self</span>.<span class='ident'>col</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='prelude-val'>Some</span>(<span class='prelude-val'>Ok</span>(<span class='string'>b'\n'</span>))
}
<span class='prelude-val'>Some</span>(<span class='prelude-val'>Ok</span>(<span class='ident'>c</span>)) <span class='op'>=></span> {
<span class='self'>self</span>.<span class='ident'>col</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='prelude-val'>Some</span>(<span class='prelude-val'>Ok</span>(<span class='ident'>c</span>))
}
<span class='prelude-val'>Some</span>(<span class='prelude-val'>Err</span>(<span class='ident'>e</span>)) <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='prelude-val'>Err</span>(<span class='ident'>e</span>)),
}
}
}
</pre>
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