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</pre><pre class='rust '>
<span class='comment'>// Copyright 2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class='comment'>// file at the top-level directory of this distribution and at</span>
<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span>
<span class='comment'>//</span>
<span class='comment'>// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class='comment'>// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
<span class='comment'>// except according to those terms.</span>

<span class='doccomment'>//! A private parser implementation of IPv4, IPv6, and socket addresses.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! This module is &quot;publicly exported&quot; through the `FromStr` implementations</span>
<span class='doccomment'>//! below.</span>

<span class='kw'>use</span> <span class='ident'>prelude</span>::<span class='ident'>v1</span>::<span class='op'>*</span>;

<span class='kw'>use</span> <span class='ident'>str</span>::<span class='ident'>FromStr</span>;
<span class='kw'>use</span> <span class='ident'>net</span>::{<span class='ident'>Ipv4Addr</span>, <span class='ident'>Ipv6Addr</span>, <span class='ident'>IpAddr</span>, <span class='ident'>SocketAddr</span>};

<span class='kw'>struct</span> <span class='ident'>Parser</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
    <span class='comment'>// parsing as ASCII, so can use byte array</span>
    <span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> [<span class='ident'>u8</span>],
    <span class='ident'>pos</span>: <span class='ident'>usize</span>,
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Parser</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
    <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>Parser</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
        <span class='ident'>Parser</span> {
            <span class='ident'>s</span>: <span class='ident'>s</span>.<span class='ident'>as_bytes</span>(),
            <span class='ident'>pos</span>: <span class='number'>0</span>,
        }
    }

    <span class='kw'>fn</span> <span class='ident'>is_eof</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
        <span class='self'>self</span>.<span class='ident'>pos</span> <span class='op'>==</span> <span class='self'>self</span>.<span class='ident'>s</span>.<span class='ident'>len</span>()
    }

    <span class='comment'>// Commit only if parser returns Some</span>
    <span class='kw'>fn</span> <span class='ident'>read_atomically</span><span class='op'>&lt;</span><span class='ident'>T</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>cb</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> <span class='kw'>where</span>
        <span class='ident'>F</span>: <span class='ident'>FnOnce</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span>,
    {
        <span class='kw'>let</span> <span class='ident'>pos</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>pos</span>;
        <span class='kw'>let</span> <span class='ident'>r</span> <span class='op'>=</span> <span class='ident'>cb</span>(<span class='self'>self</span>);
        <span class='kw'>if</span> <span class='ident'>r</span>.<span class='ident'>is_none</span>() {
            <span class='self'>self</span>.<span class='ident'>pos</span> <span class='op'>=</span> <span class='ident'>pos</span>;
        }
        <span class='ident'>r</span>
    }

    <span class='comment'>// Commit only if parser read till EOF</span>
    <span class='kw'>fn</span> <span class='ident'>read_till_eof</span><span class='op'>&lt;</span><span class='ident'>T</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>cb</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> <span class='kw'>where</span>
        <span class='ident'>F</span>: <span class='ident'>FnOnce</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span>,
    {
        <span class='self'>self</span>.<span class='ident'>read_atomically</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> {
            <span class='kw'>match</span> <span class='ident'>cb</span>(<span class='ident'>p</span>) {
                <span class='prelude-val'>Some</span>(<span class='ident'>x</span>) <span class='op'>=&gt;</span> <span class='kw'>if</span> <span class='ident'>p</span>.<span class='ident'>is_eof</span>() {<span class='prelude-val'>Some</span>(<span class='ident'>x</span>)} <span class='kw'>else</span> {<span class='prelude-val'>None</span>},
                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>None</span>,
            }
        })
    }

    <span class='comment'>// Return result of first successful parser</span>
    <span class='kw'>fn</span> <span class='ident'>read_or</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>parsers</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> [<span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>FnMut</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;&gt;</span>])
               <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> {
        <span class='kw'>for</span> <span class='ident'>pf</span> <span class='kw'>in</span> <span class='ident'>parsers</span>.<span class='ident'>iter_mut</span>() {
            <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>read_atomically</span>(<span class='op'>|</span><span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span><span class='op'>|</span> <span class='ident'>pf</span>(<span class='ident'>p</span>)) {
                <span class='prelude-val'>Some</span>(<span class='ident'>r</span>) <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='prelude-val'>Some</span>(<span class='ident'>r</span>),
                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {}
            }
        }
        <span class='prelude-val'>None</span>
    }

    <span class='comment'>// Apply 3 parsers sequentially</span>
    <span class='kw'>fn</span> <span class='ident'>read_seq_3</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>PA</span>, <span class='ident'>PB</span>, <span class='ident'>PC</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>,
                                       <span class='ident'>pa</span>: <span class='ident'>PA</span>,
                                       <span class='ident'>pb</span>: <span class='ident'>PB</span>,
                                       <span class='ident'>pc</span>: <span class='ident'>PC</span>)
                                       <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span>(<span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>C</span>)<span class='op'>&gt;</span> <span class='kw'>where</span>
        <span class='ident'>PA</span>: <span class='ident'>FnOnce</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>,
        <span class='ident'>PB</span>: <span class='ident'>FnOnce</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>,
        <span class='ident'>PC</span>: <span class='ident'>FnOnce</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>C</span><span class='op'>&gt;</span>,
    {
        <span class='self'>self</span>.<span class='ident'>read_atomically</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> {
            <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>pa</span>(<span class='ident'>p</span>);
            <span class='kw'>let</span> <span class='ident'>b</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>a</span>.<span class='ident'>is_some</span>() { <span class='ident'>pb</span>(<span class='ident'>p</span>) } <span class='kw'>else</span> { <span class='prelude-val'>None</span> };
            <span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>b</span>.<span class='ident'>is_some</span>() { <span class='ident'>pc</span>(<span class='ident'>p</span>) } <span class='kw'>else</span> { <span class='prelude-val'>None</span> };
            <span class='kw'>match</span> (<span class='ident'>a</span>, <span class='ident'>b</span>, <span class='ident'>c</span>) {
                (<span class='prelude-val'>Some</span>(<span class='ident'>a</span>), <span class='prelude-val'>Some</span>(<span class='ident'>b</span>), <span class='prelude-val'>Some</span>(<span class='ident'>c</span>)) <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>((<span class='ident'>a</span>, <span class='ident'>b</span>, <span class='ident'>c</span>)),
                _ <span class='op'>=&gt;</span> <span class='prelude-val'>None</span>
            }
        })
    }

    <span class='comment'>// Read next char</span>
    <span class='kw'>fn</span> <span class='ident'>read_char</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span> {
        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>is_eof</span>() {
            <span class='prelude-val'>None</span>
        } <span class='kw'>else</span> {
            <span class='kw'>let</span> <span class='ident'>r</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>s</span>[<span class='self'>self</span>.<span class='ident'>pos</span>] <span class='kw'>as</span> <span class='ident'>char</span>;
            <span class='self'>self</span>.<span class='ident'>pos</span> <span class='op'>+=</span> <span class='number'>1</span>;
            <span class='prelude-val'>Some</span>(<span class='ident'>r</span>)
        }
    }

    <span class='comment'>// Return char and advance iff next char is equal to requested</span>
    <span class='kw'>fn</span> <span class='ident'>read_given_char</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span> {
        <span class='self'>self</span>.<span class='ident'>read_atomically</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> {
            <span class='kw'>match</span> <span class='ident'>p</span>.<span class='ident'>read_char</span>() {
                <span class='prelude-val'>Some</span>(<span class='ident'>next</span>) <span class='kw'>if</span> <span class='ident'>next</span> <span class='op'>==</span> <span class='ident'>c</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>next</span>),
                _ <span class='op'>=&gt;</span> <span class='prelude-val'>None</span>,
            }
        })
    }

    <span class='comment'>// Read digit</span>
    <span class='kw'>fn</span> <span class='ident'>read_digit</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>radix</span>: <span class='ident'>u8</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> {
        <span class='kw'>fn</span> <span class='ident'>parse_digit</span>(<span class='ident'>c</span>: <span class='ident'>char</span>, <span class='ident'>radix</span>: <span class='ident'>u8</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> {
            <span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>c</span> <span class='kw'>as</span> <span class='ident'>u8</span>;
            <span class='comment'>// assuming radix is either 10 or 16</span>
            <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='string'>b&#39;0&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='string'>b&#39;9&#39;</span> {
                <span class='prelude-val'>Some</span>(<span class='ident'>c</span> <span class='op'>-</span> <span class='string'>b&#39;0&#39;</span>)
            } <span class='kw'>else</span> <span class='kw'>if</span> <span class='ident'>radix</span> <span class='op'>&gt;</span> <span class='number'>10</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='string'>b&#39;a&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;</span> <span class='string'>b&#39;a&#39;</span> <span class='op'>+</span> (<span class='ident'>radix</span> <span class='op'>-</span> <span class='number'>10</span>) {
                <span class='prelude-val'>Some</span>(<span class='ident'>c</span> <span class='op'>-</span> <span class='string'>b&#39;a&#39;</span> <span class='op'>+</span> <span class='number'>10</span>)
            } <span class='kw'>else</span> <span class='kw'>if</span> <span class='ident'>radix</span> <span class='op'>&gt;</span> <span class='number'>10</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='string'>b&#39;A&#39;</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;</span> <span class='string'>b&#39;A&#39;</span> <span class='op'>+</span> (<span class='ident'>radix</span> <span class='op'>-</span> <span class='number'>10</span>) {
                <span class='prelude-val'>Some</span>(<span class='ident'>c</span> <span class='op'>-</span> <span class='string'>b&#39;A&#39;</span> <span class='op'>+</span> <span class='number'>10</span>)
            } <span class='kw'>else</span> {
                <span class='prelude-val'>None</span>
            }
        }

        <span class='self'>self</span>.<span class='ident'>read_atomically</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> {
            <span class='ident'>p</span>.<span class='ident'>read_char</span>().<span class='ident'>and_then</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>parse_digit</span>(<span class='ident'>c</span>, <span class='ident'>radix</span>))
        })
    }

    <span class='kw'>fn</span> <span class='ident'>read_number_impl</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>radix</span>: <span class='ident'>u8</span>, <span class='ident'>max_digits</span>: <span class='ident'>u32</span>, <span class='ident'>upto</span>: <span class='ident'>u32</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span> {
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>r</span> <span class='op'>=</span> <span class='number'>0</span>;
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>digit_count</span> <span class='op'>=</span> <span class='number'>0</span>;
        <span class='kw'>loop</span> {
            <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>read_digit</span>(<span class='ident'>radix</span>) {
                <span class='prelude-val'>Some</span>(<span class='ident'>d</span>) <span class='op'>=&gt;</span> {
                    <span class='ident'>r</span> <span class='op'>=</span> <span class='ident'>r</span> <span class='op'>*</span> (<span class='ident'>radix</span> <span class='kw'>as</span> <span class='ident'>u32</span>) <span class='op'>+</span> (<span class='ident'>d</span> <span class='kw'>as</span> <span class='ident'>u32</span>);
                    <span class='ident'>digit_count</span> <span class='op'>+=</span> <span class='number'>1</span>;
                    <span class='kw'>if</span> <span class='ident'>digit_count</span> <span class='op'>&gt;</span> <span class='ident'>max_digits</span> <span class='op'>||</span> <span class='ident'>r</span> <span class='op'>&gt;=</span> <span class='ident'>upto</span> {
                        <span class='kw'>return</span> <span class='prelude-val'>None</span>
                    }
                }
                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {
                    <span class='kw'>if</span> <span class='ident'>digit_count</span> <span class='op'>==</span> <span class='number'>0</span> {
                        <span class='kw'>return</span> <span class='prelude-val'>None</span>
                    } <span class='kw'>else</span> {
                        <span class='kw'>return</span> <span class='prelude-val'>Some</span>(<span class='ident'>r</span>)
                    }
                }
            };
        }
    }

    <span class='comment'>// Read number, failing if max_digits of number value exceeded</span>
    <span class='kw'>fn</span> <span class='ident'>read_number</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>radix</span>: <span class='ident'>u8</span>, <span class='ident'>max_digits</span>: <span class='ident'>u32</span>, <span class='ident'>upto</span>: <span class='ident'>u32</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span> {
        <span class='self'>self</span>.<span class='ident'>read_atomically</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_number_impl</span>(<span class='ident'>radix</span>, <span class='ident'>max_digits</span>, <span class='ident'>upto</span>))
    }

    <span class='kw'>fn</span> <span class='ident'>read_ipv4_addr_impl</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Ipv4Addr</span><span class='op'>&gt;</span> {
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>bs</span> <span class='op'>=</span> [<span class='number'>0</span>; <span class='number'>4</span>];
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>i</span> <span class='op'>=</span> <span class='number'>0</span>;
        <span class='kw'>while</span> <span class='ident'>i</span> <span class='op'>&lt;</span> <span class='number'>4</span> {
            <span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>!=</span> <span class='number'>0</span> <span class='op'>&amp;&amp;</span> <span class='self'>self</span>.<span class='ident'>read_given_char</span>(<span class='string'>&#39;.&#39;</span>).<span class='ident'>is_none</span>() {
                <span class='kw'>return</span> <span class='prelude-val'>None</span>;
            }

            <span class='kw'>let</span> <span class='ident'>octet</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>read_number</span>(<span class='number'>10</span>, <span class='number'>3</span>, <span class='number'>0x100</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>n</span><span class='op'>|</span> <span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>u8</span>);
            <span class='kw'>match</span> <span class='ident'>octet</span> {
                <span class='prelude-val'>Some</span>(<span class='ident'>d</span>) <span class='op'>=&gt;</span> <span class='ident'>bs</span>[<span class='ident'>i</span>] <span class='op'>=</span> <span class='ident'>d</span>,
                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
            };
            <span class='ident'>i</span> <span class='op'>+=</span> <span class='number'>1</span>;
        }
        <span class='prelude-val'>Some</span>(<span class='ident'>Ipv4Addr</span>::<span class='ident'>new</span>(<span class='ident'>bs</span>[<span class='number'>0</span>], <span class='ident'>bs</span>[<span class='number'>1</span>], <span class='ident'>bs</span>[<span class='number'>2</span>], <span class='ident'>bs</span>[<span class='number'>3</span>]))
    }

    <span class='comment'>// Read IPv4 address</span>
    <span class='kw'>fn</span> <span class='ident'>read_ipv4_addr</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Ipv4Addr</span><span class='op'>&gt;</span> {
        <span class='self'>self</span>.<span class='ident'>read_atomically</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_ipv4_addr_impl</span>())
    }

    <span class='kw'>fn</span> <span class='ident'>read_ipv6_addr_impl</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Ipv6Addr</span><span class='op'>&gt;</span> {
        <span class='kw'>fn</span> <span class='ident'>ipv6_addr_from_head_tail</span>(<span class='ident'>head</span>: <span class='kw-2'>&amp;</span>[<span class='ident'>u16</span>], <span class='ident'>tail</span>: <span class='kw-2'>&amp;</span>[<span class='ident'>u16</span>]) <span class='op'>-&gt;</span> <span class='ident'>Ipv6Addr</span> {
            <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>head</span>.<span class='ident'>len</span>() <span class='op'>+</span> <span class='ident'>tail</span>.<span class='ident'>len</span>() <span class='op'>&lt;=</span> <span class='number'>8</span>);
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>gs</span> <span class='op'>=</span> [<span class='number'>0</span>; <span class='number'>8</span>];
            <span class='ident'>gs</span>.<span class='ident'>clone_from_slice</span>(<span class='ident'>head</span>);
            <span class='ident'>gs</span>[(<span class='number'>8</span> <span class='op'>-</span> <span class='ident'>tail</span>.<span class='ident'>len</span>()) .. <span class='number'>8</span>].<span class='ident'>clone_from_slice</span>(<span class='ident'>tail</span>);
            <span class='ident'>Ipv6Addr</span>::<span class='ident'>new</span>(<span class='ident'>gs</span>[<span class='number'>0</span>], <span class='ident'>gs</span>[<span class='number'>1</span>], <span class='ident'>gs</span>[<span class='number'>2</span>], <span class='ident'>gs</span>[<span class='number'>3</span>], <span class='ident'>gs</span>[<span class='number'>4</span>], <span class='ident'>gs</span>[<span class='number'>5</span>], <span class='ident'>gs</span>[<span class='number'>6</span>], <span class='ident'>gs</span>[<span class='number'>7</span>])
        }

        <span class='kw'>fn</span> <span class='ident'>read_groups</span>(<span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span>, <span class='ident'>groups</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> [<span class='ident'>u16</span>; <span class='number'>8</span>], <span class='ident'>limit</span>: <span class='ident'>usize</span>)
                       <span class='op'>-&gt;</span> (<span class='ident'>usize</span>, <span class='ident'>bool</span>) {
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>i</span> <span class='op'>=</span> <span class='number'>0</span>;
            <span class='kw'>while</span> <span class='ident'>i</span> <span class='op'>&lt;</span> <span class='ident'>limit</span> {
                <span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>&lt;</span> <span class='ident'>limit</span> <span class='op'>-</span> <span class='number'>1</span> {
                    <span class='kw'>let</span> <span class='ident'>ipv4</span> <span class='op'>=</span> <span class='ident'>p</span>.<span class='ident'>read_atomically</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> {
                        <span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>==</span> <span class='number'>0</span> <span class='op'>||</span> <span class='ident'>p</span>.<span class='ident'>read_given_char</span>(<span class='string'>&#39;:&#39;</span>).<span class='ident'>is_some</span>() {
                            <span class='ident'>p</span>.<span class='ident'>read_ipv4_addr</span>()
                        } <span class='kw'>else</span> {
                            <span class='prelude-val'>None</span>
                        }
                    });
                    <span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>v4_addr</span>) <span class='op'>=</span> <span class='ident'>ipv4</span> {
                        <span class='kw'>let</span> <span class='ident'>octets</span> <span class='op'>=</span> <span class='ident'>v4_addr</span>.<span class='ident'>octets</span>();
                        <span class='ident'>groups</span>[<span class='ident'>i</span> <span class='op'>+</span> <span class='number'>0</span>] <span class='op'>=</span> ((<span class='ident'>octets</span>[<span class='number'>0</span>] <span class='kw'>as</span> <span class='ident'>u16</span>) <span class='op'>&lt;&lt;</span> <span class='number'>8</span>) <span class='op'>|</span> (<span class='ident'>octets</span>[<span class='number'>1</span>] <span class='kw'>as</span> <span class='ident'>u16</span>);
                        <span class='ident'>groups</span>[<span class='ident'>i</span> <span class='op'>+</span> <span class='number'>1</span>] <span class='op'>=</span> ((<span class='ident'>octets</span>[<span class='number'>2</span>] <span class='kw'>as</span> <span class='ident'>u16</span>) <span class='op'>&lt;&lt;</span> <span class='number'>8</span>) <span class='op'>|</span> (<span class='ident'>octets</span>[<span class='number'>3</span>] <span class='kw'>as</span> <span class='ident'>u16</span>);
                        <span class='kw'>return</span> (<span class='ident'>i</span> <span class='op'>+</span> <span class='number'>2</span>, <span class='boolval'>true</span>);
                    }
                }

                <span class='kw'>let</span> <span class='ident'>group</span> <span class='op'>=</span> <span class='ident'>p</span>.<span class='ident'>read_atomically</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> {
                    <span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>==</span> <span class='number'>0</span> <span class='op'>||</span> <span class='ident'>p</span>.<span class='ident'>read_given_char</span>(<span class='string'>&#39;:&#39;</span>).<span class='ident'>is_some</span>() {
                        <span class='ident'>p</span>.<span class='ident'>read_number</span>(<span class='number'>16</span>, <span class='number'>4</span>, <span class='number'>0x10000</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>n</span><span class='op'>|</span> <span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>u16</span>)
                    } <span class='kw'>else</span> {
                        <span class='prelude-val'>None</span>
                    }
                });
                <span class='kw'>match</span> <span class='ident'>group</span> {
                    <span class='prelude-val'>Some</span>(<span class='ident'>g</span>) <span class='op'>=&gt;</span> <span class='ident'>groups</span>[<span class='ident'>i</span>] <span class='op'>=</span> <span class='ident'>g</span>,
                    <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='kw'>return</span> (<span class='ident'>i</span>, <span class='boolval'>false</span>)
                }
                <span class='ident'>i</span> <span class='op'>+=</span> <span class='number'>1</span>;
            }
            (<span class='ident'>i</span>, <span class='boolval'>false</span>)
        }

        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>head</span> <span class='op'>=</span> [<span class='number'>0</span>; <span class='number'>8</span>];
        <span class='kw'>let</span> (<span class='ident'>head_size</span>, <span class='ident'>head_ipv4</span>) <span class='op'>=</span> <span class='ident'>read_groups</span>(<span class='self'>self</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>head</span>, <span class='number'>8</span>);

        <span class='kw'>if</span> <span class='ident'>head_size</span> <span class='op'>==</span> <span class='number'>8</span> {
            <span class='kw'>return</span> <span class='prelude-val'>Some</span>(<span class='ident'>Ipv6Addr</span>::<span class='ident'>new</span>(
                <span class='ident'>head</span>[<span class='number'>0</span>], <span class='ident'>head</span>[<span class='number'>1</span>], <span class='ident'>head</span>[<span class='number'>2</span>], <span class='ident'>head</span>[<span class='number'>3</span>],
                <span class='ident'>head</span>[<span class='number'>4</span>], <span class='ident'>head</span>[<span class='number'>5</span>], <span class='ident'>head</span>[<span class='number'>6</span>], <span class='ident'>head</span>[<span class='number'>7</span>]))
        }

        <span class='comment'>// IPv4 part is not allowed before `::`</span>
        <span class='kw'>if</span> <span class='ident'>head_ipv4</span> {
            <span class='kw'>return</span> <span class='prelude-val'>None</span>
        }

        <span class='comment'>// read `::` if previous code parsed less than 8 groups</span>
        <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>read_given_char</span>(<span class='string'>&#39;:&#39;</span>).<span class='ident'>is_some</span>() <span class='op'>||</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>read_given_char</span>(<span class='string'>&#39;:&#39;</span>).<span class='ident'>is_some</span>() {
            <span class='kw'>return</span> <span class='prelude-val'>None</span>;
        }

        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>tail</span> <span class='op'>=</span> [<span class='number'>0</span>; <span class='number'>8</span>];
        <span class='kw'>let</span> (<span class='ident'>tail_size</span>, _) <span class='op'>=</span> <span class='ident'>read_groups</span>(<span class='self'>self</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>tail</span>, <span class='number'>8</span> <span class='op'>-</span> <span class='ident'>head_size</span>);
        <span class='prelude-val'>Some</span>(<span class='ident'>ipv6_addr_from_head_tail</span>(<span class='kw-2'>&amp;</span><span class='ident'>head</span>[..<span class='ident'>head_size</span>], <span class='kw-2'>&amp;</span><span class='ident'>tail</span>[..<span class='ident'>tail_size</span>]))
    }

    <span class='kw'>fn</span> <span class='ident'>read_ipv6_addr</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Ipv6Addr</span><span class='op'>&gt;</span> {
        <span class='self'>self</span>.<span class='ident'>read_atomically</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_ipv6_addr_impl</span>())
    }

    <span class='kw'>fn</span> <span class='ident'>read_ip_addr</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>IpAddr</span><span class='op'>&gt;</span> {
        <span class='kw'>let</span> <span class='ident'>ipv4_addr</span> <span class='op'>=</span> <span class='op'>|</span><span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_ipv4_addr</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>v4</span><span class='op'>|</span> <span class='ident'>IpAddr</span>::<span class='ident'>V4</span>(<span class='ident'>v4</span>));
        <span class='kw'>let</span> <span class='ident'>ipv6_addr</span> <span class='op'>=</span> <span class='op'>|</span><span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_ipv6_addr</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>v6</span><span class='op'>|</span> <span class='ident'>IpAddr</span>::<span class='ident'>V6</span>(<span class='ident'>v6</span>));
        <span class='self'>self</span>.<span class='ident'>read_or</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> [<span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>ipv4_addr</span>), <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>ipv6_addr</span>)])
    }

    <span class='kw'>fn</span> <span class='ident'>read_socket_addr</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>SocketAddr</span><span class='op'>&gt;</span> {
        <span class='kw'>let</span> <span class='ident'>ip_addr</span> <span class='op'>=</span> <span class='op'>|</span><span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span><span class='op'>|</span> {
            <span class='kw'>let</span> <span class='ident'>ipv4_p</span> <span class='op'>=</span> <span class='op'>|</span><span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_ip_addr</span>();
            <span class='kw'>let</span> <span class='ident'>ipv6_p</span> <span class='op'>=</span> <span class='op'>|</span><span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span><span class='op'>|</span> {
                <span class='kw'>let</span> <span class='ident'>open_br</span> <span class='op'>=</span> <span class='op'>|</span><span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_given_char</span>(<span class='string'>&#39;[&#39;</span>);
                <span class='kw'>let</span> <span class='ident'>ip_addr</span> <span class='op'>=</span> <span class='op'>|</span><span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_ipv6_addr</span>();
                <span class='kw'>let</span> <span class='ident'>clos_br</span> <span class='op'>=</span> <span class='op'>|</span><span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_given_char</span>(<span class='string'>&#39;]&#39;</span>);
                <span class='ident'>p</span>.<span class='ident'>read_seq_3</span>::<span class='op'>&lt;</span><span class='ident'>char</span>, <span class='ident'>Ipv6Addr</span>, <span class='ident'>char</span>, _, _, _<span class='op'>&gt;</span>(<span class='ident'>open_br</span>, <span class='ident'>ip_addr</span>, <span class='ident'>clos_br</span>)
                        .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>t</span><span class='op'>|</span> <span class='kw'>match</span> <span class='ident'>t</span> { (_, <span class='ident'>ip</span>, _) <span class='op'>=&gt;</span> <span class='ident'>IpAddr</span>::<span class='ident'>V6</span>(<span class='ident'>ip</span>) })
            };
            <span class='ident'>p</span>.<span class='ident'>read_or</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> [<span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>ipv4_p</span>), <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>ipv6_p</span>)])
        };
        <span class='kw'>let</span> <span class='ident'>colon</span> <span class='op'>=</span> <span class='op'>|</span><span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_given_char</span>(<span class='string'>&#39;:&#39;</span>);
        <span class='kw'>let</span> <span class='ident'>port</span>  <span class='op'>=</span> <span class='op'>|</span><span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Parser</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_number</span>(<span class='number'>10</span>, <span class='number'>5</span>, <span class='number'>0x10000</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>n</span><span class='op'>|</span> <span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>u16</span>);

        <span class='comment'>// host, colon, port</span>
        <span class='self'>self</span>.<span class='ident'>read_seq_3</span>::<span class='op'>&lt;</span><span class='ident'>IpAddr</span>, <span class='ident'>char</span>, <span class='ident'>u16</span>, _, _, _<span class='op'>&gt;</span>(<span class='ident'>ip_addr</span>, <span class='ident'>colon</span>, <span class='ident'>port</span>)
                .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>t</span><span class='op'>|</span> <span class='kw'>match</span> <span class='ident'>t</span> { (<span class='ident'>ip</span>, _, <span class='ident'>port</span>) <span class='op'>=&gt;</span> <span class='ident'>SocketAddr</span>::<span class='ident'>new</span>(<span class='ident'>ip</span>, <span class='ident'>port</span>) })
    }
}

<span class='kw'>impl</span> <span class='ident'>FromStr</span> <span class='kw'>for</span> <span class='ident'>IpAddr</span> {
    <span class='kw'>type</span> <span class='prelude-val'>Err</span> <span class='op'>=</span> <span class='ident'>ParseError</span>;
    <span class='kw'>fn</span> <span class='ident'>from_str</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>IpAddr</span>, <span class='ident'>ParseError</span><span class='op'>&gt;</span> {
        <span class='kw'>match</span> <span class='ident'>Parser</span>::<span class='ident'>new</span>(<span class='ident'>s</span>).<span class='ident'>read_till_eof</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_ip_addr</span>()) {
            <span class='prelude-val'>Some</span>(<span class='ident'>s</span>) <span class='op'>=&gt;</span> <span class='prelude-val'>Ok</span>(<span class='ident'>s</span>),
            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='ident'>ParseError</span>),
        }
    }
}

<span class='kw'>impl</span> <span class='ident'>FromStr</span> <span class='kw'>for</span> <span class='ident'>Ipv4Addr</span> {
    <span class='kw'>type</span> <span class='prelude-val'>Err</span> <span class='op'>=</span> <span class='ident'>ParseError</span>;
    <span class='kw'>fn</span> <span class='ident'>from_str</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Ipv4Addr</span>, <span class='ident'>ParseError</span><span class='op'>&gt;</span> {
        <span class='kw'>match</span> <span class='ident'>Parser</span>::<span class='ident'>new</span>(<span class='ident'>s</span>).<span class='ident'>read_till_eof</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_ipv4_addr</span>()) {
            <span class='prelude-val'>Some</span>(<span class='ident'>s</span>) <span class='op'>=&gt;</span> <span class='prelude-val'>Ok</span>(<span class='ident'>s</span>),
            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='ident'>ParseError</span>)
        }
    }
}

<span class='kw'>impl</span> <span class='ident'>FromStr</span> <span class='kw'>for</span> <span class='ident'>Ipv6Addr</span> {
    <span class='kw'>type</span> <span class='prelude-val'>Err</span> <span class='op'>=</span> <span class='ident'>ParseError</span>;
    <span class='kw'>fn</span> <span class='ident'>from_str</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Ipv6Addr</span>, <span class='ident'>ParseError</span><span class='op'>&gt;</span> {
        <span class='kw'>match</span> <span class='ident'>Parser</span>::<span class='ident'>new</span>(<span class='ident'>s</span>).<span class='ident'>read_till_eof</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_ipv6_addr</span>()) {
            <span class='prelude-val'>Some</span>(<span class='ident'>s</span>) <span class='op'>=&gt;</span> <span class='prelude-val'>Ok</span>(<span class='ident'>s</span>),
            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='ident'>ParseError</span>)
        }
    }
}

<span class='kw'>impl</span> <span class='ident'>FromStr</span> <span class='kw'>for</span> <span class='ident'>SocketAddr</span> {
    <span class='kw'>type</span> <span class='prelude-val'>Err</span> <span class='op'>=</span> <span class='ident'>ParseError</span>;
    <span class='kw'>fn</span> <span class='ident'>from_str</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>SocketAddr</span>, <span class='ident'>ParseError</span><span class='op'>&gt;</span> {
        <span class='kw'>match</span> <span class='ident'>Parser</span>::<span class='ident'>new</span>(<span class='ident'>s</span>).<span class='ident'>read_till_eof</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> <span class='ident'>p</span>.<span class='ident'>read_socket_addr</span>()) {
            <span class='prelude-val'>Some</span>(<span class='ident'>s</span>) <span class='op'>=&gt;</span> <span class='prelude-val'>Ok</span>(<span class='ident'>s</span>),
            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='ident'>ParseError</span>),
        }
    }
}

<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>, <span class='ident'>Clone</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Copy</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>ParseError</span>;
</pre>
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