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</pre><pre class="rust"><code><span class="kw">use </span>std::str;
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<span class="kw">use </span>actix_web::web::BytesMut;
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<span class="kw">enum </span>State {
YieldStr,
YieldQuote,
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}
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<span class="kw">struct </span>Quoted&lt;<span class="lifetime">&#39;a</span>&gt; {
inner: ::std::iter::Peekable&lt;str::Split&lt;<span class="lifetime">&#39;a</span>, char&gt;&gt;,
state: State,
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}
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<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Quoted&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="kw">pub fn </span>new(s: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str) -&gt; Quoted&lt;<span class="lifetime">&#39;_</span>&gt; {
Quoted {
inner: s.split(<span class="string">&#39;&quot;&#39;</span>).peekable(),
state: State::YieldStr,
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}
}
}
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<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Iterator <span class="kw">for </span>Quoted&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="kw">type </span>Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str;
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<span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt; {
<span class="kw">match </span><span class="self">self</span>.state {
State::YieldStr =&gt; <span class="kw">match </span><span class="self">self</span>.inner.next() {
<span class="prelude-val">Some</span>(val) =&gt; {
<span class="self">self</span>.state = State::YieldQuote;
<span class="prelude-val">Some</span>(val)
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}
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<span class="prelude-val">None </span>=&gt; <span class="prelude-val">None</span>,
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},
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State::YieldQuote =&gt; <span class="kw">match </span><span class="self">self</span>.inner.peek() {
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<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; {
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<span class="self">self</span>.state = State::YieldStr;
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<span class="prelude-val">Some</span>(<span class="string">&quot;\\\&quot;&quot;</span>)
}
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<span class="prelude-val">None </span>=&gt; <span class="prelude-val">None</span>,
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},
}
}
}
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<span class="doccomment">/// Escapes the quotes in `val`.
</span><span class="kw">pub fn </span>put_quoted(buf: <span class="kw-2">&amp;mut </span>BytesMut, val: <span class="kw-2">&amp;</span>str) {
<span class="kw">for </span>part <span class="kw">in </span>Quoted::new(val) {
buf.extend_from_slice(part.as_bytes());
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}
}
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<span class="attr">#[cfg(test)]
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</span><span class="kw">mod </span>tests {
<span class="kw">use </span>std::str;
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<span class="kw">use </span>actix_web::web::BytesMut;
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<span class="kw">use </span><span class="kw">super</span>::put_quoted;
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<span class="attr">#[test]
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</span><span class="kw">fn </span>test_quote_str() {
<span class="kw">let </span>input = <span class="string">&quot;a \&quot;quoted\&quot; string&quot;</span>;
<span class="kw">let </span><span class="kw-2">mut </span>output = BytesMut::new();
put_quoted(<span class="kw-2">&amp;mut </span>output, input);
<span class="kw">let </span>result = str::from_utf8(<span class="kw-2">&amp;</span>output).unwrap();
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<span class="macro">assert_eq!</span>(result, <span class="string">&quot;a \\\&quot;quoted\\\&quot; string&quot;</span>);
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}
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<span class="attr">#[test]
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</span><span class="kw">fn </span>test_without_quotes() {
<span class="kw">let </span>input = <span class="string">&quot;non-quoted string&quot;</span>;
<span class="kw">let </span><span class="kw-2">mut </span>output = BytesMut::new();
put_quoted(<span class="kw-2">&amp;mut </span>output, input);
<span class="kw">let </span>result = str::from_utf8(<span class="kw-2">&amp;</span>output).unwrap();
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<span class="macro">assert_eq!</span>(result, <span class="string">&quot;non-quoted string&quot;</span>);
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}
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<span class="attr">#[test]
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</span><span class="kw">fn </span>test_starts_with_quote() {
<span class="kw">let </span>input = <span class="string">&quot;\&quot;first-quoted string&quot;</span>;
<span class="kw">let </span><span class="kw-2">mut </span>output = BytesMut::new();
put_quoted(<span class="kw-2">&amp;mut </span>output, input);
<span class="kw">let </span>result = str::from_utf8(<span class="kw-2">&amp;</span>output).unwrap();
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<span class="macro">assert_eq!</span>(result, <span class="string">&quot;\\\&quot;first-quoted string&quot;</span>);
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}
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<span class="attr">#[test]
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</span><span class="kw">fn </span>test_ends_with_quote() {
<span class="kw">let </span>input = <span class="string">&quot;last-quoted string\&quot;&quot;</span>;
<span class="kw">let </span><span class="kw-2">mut </span>output = BytesMut::new();
put_quoted(<span class="kw-2">&amp;mut </span>output, input);
<span class="kw">let </span>result = str::from_utf8(<span class="kw-2">&amp;</span>output).unwrap();
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<span class="macro">assert_eq!</span>(result, <span class="string">&quot;last-quoted string\\\&quot;&quot;</span>);
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}
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<span class="attr">#[test]
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</span><span class="kw">fn </span>test_double_quote() {
<span class="kw">let </span>input = <span class="string">&quot;quote\&quot;\&quot;string&quot;</span>;
<span class="kw">let </span><span class="kw-2">mut </span>output = BytesMut::new();
put_quoted(<span class="kw-2">&amp;mut </span>output, input);
<span class="kw">let </span>result = str::from_utf8(<span class="kw-2">&amp;</span>output).unwrap();
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<span class="macro">assert_eq!</span>(result, <span class="string">&quot;quote\\\&quot;\\\&quot;string&quot;</span>);
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}
}
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</code></pre></div>
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