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</pre><pre class='rust '>
<span class='comment'>// Copyright 2016 LambdaStack All rights reserved.</span>
<span class='comment'>//</span>
<span class='comment'>// Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span>
<span class='comment'>// you may not use this file except in compliance with the License.</span>
<span class='comment'>// You may obtain a copy of the License at</span>
<span class='comment'>//</span>
<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0</span>
<span class='comment'>//</span>
<span class='comment'>// Unless required by applicable law or agreed to in writing, software</span>
<span class='comment'>// distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<span class='comment'>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class='comment'>// See the License for the specific language governing permissions and</span>
<span class='comment'>// limitations under the License.</span>

<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fmt</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>str</span>::<span class='ident'>FromStr</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>convert</span>::<span class='ident'>AsRef</span>;

<span class='kw'>use</span> <span class='ident'>error</span>::<span class='ident'>Error</span>;
<span class='kw'>use</span> <span class='self'>self</span>::<span class='ident'>Method</span>::{<span class='ident'>Options</span>, <span class='ident'>Get</span>, <span class='ident'>Post</span>, <span class='ident'>Put</span>, <span class='ident'>Delete</span>, <span class='ident'>Head</span>, <span class='ident'>Trace</span>, <span class='ident'>Connect</span>, <span class='ident'>Patch</span>,
                   <span class='ident'>Extension</span>};


<span class='doccomment'>/// The Request Method (VERB)</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Currently includes 8 variants representing the 8 methods defined in</span>
<span class='doccomment'>/// [RFC 7230](https://tools.ietf.org/html/rfc7231#section-4.1), plus PATCH,</span>
<span class='doccomment'>/// and an Extension variant for all extensions.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// It may make sense to grow this to include all variants currently</span>
<span class='doccomment'>/// registered with IANA, if they are at all common to use.</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>, <span class='ident'>Hash</span>, <span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Method</span> {
   <span class='doccomment'>/// OPTIONS</span>
   <span class='ident'>Options</span>,
   <span class='doccomment'>/// GET</span>
   <span class='ident'>Get</span>,
   <span class='doccomment'>/// POST</span>
   <span class='ident'>Post</span>,
   <span class='doccomment'>/// PUT</span>
   <span class='ident'>Put</span>,
   <span class='doccomment'>/// DELETE</span>
   <span class='ident'>Delete</span>,
   <span class='doccomment'>/// HEAD</span>
   <span class='ident'>Head</span>,
   <span class='doccomment'>/// TRACE</span>
   <span class='ident'>Trace</span>,
   <span class='doccomment'>/// CONNECT</span>
   <span class='ident'>Connect</span>,
   <span class='doccomment'>/// PATCH</span>
   <span class='ident'>Patch</span>,
   <span class='doccomment'>/// Method extensions. An example would be `let m = Extension(&quot;FOO&quot;.to_string())`.</span>
   <span class='ident'>Extension</span>(<span class='ident'>String</span>)
}

<span class='kw'>impl</span> <span class='ident'>AsRef</span><span class='op'>&lt;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>Method</span> {
   <span class='kw'>fn</span> <span class='ident'>as_ref</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>str</span> {
       <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
           <span class='ident'>Options</span> <span class='op'>=&gt;</span> <span class='string'>&quot;OPTIONS&quot;</span>,
           <span class='ident'>Get</span> <span class='op'>=&gt;</span> <span class='string'>&quot;GET&quot;</span>,
           <span class='ident'>Post</span> <span class='op'>=&gt;</span> <span class='string'>&quot;POST&quot;</span>,
           <span class='ident'>Put</span> <span class='op'>=&gt;</span> <span class='string'>&quot;PUT&quot;</span>,
           <span class='ident'>Delete</span> <span class='op'>=&gt;</span> <span class='string'>&quot;DELETE&quot;</span>,
           <span class='ident'>Head</span> <span class='op'>=&gt;</span> <span class='string'>&quot;HEAD&quot;</span>,
           <span class='ident'>Trace</span> <span class='op'>=&gt;</span> <span class='string'>&quot;TRACE&quot;</span>,
           <span class='ident'>Connect</span> <span class='op'>=&gt;</span> <span class='string'>&quot;CONNECT&quot;</span>,
           <span class='ident'>Patch</span> <span class='op'>=&gt;</span> <span class='string'>&quot;PATCH&quot;</span>,
           <span class='ident'>Extension</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span> <span class='ident'>s</span>.<span class='ident'>as_ref</span>()
       }
   }
}

<span class='kw'>impl</span> <span class='ident'>Method</span> {
   <span class='doccomment'>/// Whether a method is considered &quot;safe&quot;, meaning the request is</span>
   <span class='doccomment'>/// essentially read-only.</span>
   <span class='doccomment'>///</span>
   <span class='doccomment'>/// See [the spec](https://tools.ietf.org/html/rfc7231#section-4.2.1)</span>
   <span class='doccomment'>/// for more words.</span>
   <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>safe</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
       <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
           <span class='ident'>Get</span> <span class='op'>|</span> <span class='ident'>Head</span> <span class='op'>|</span> <span class='ident'>Options</span> <span class='op'>|</span> <span class='ident'>Trace</span> <span class='op'>=&gt;</span> <span class='bool-val'>true</span>,
           _ <span class='op'>=&gt;</span> <span class='bool-val'>false</span>
       }
   }

   <span class='doccomment'>/// Whether a method is considered &quot;idempotent&quot;, meaning the request has</span>
   <span class='doccomment'>/// the same result if executed multiple times.</span>
   <span class='doccomment'>///</span>
   <span class='doccomment'>/// See [the spec](https://tools.ietf.org/html/rfc7231#section-4.2.2) for</span>
   <span class='doccomment'>/// more words.</span>
   <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>idempotent</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
       <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>safe</span>() {
           <span class='bool-val'>true</span>
       } <span class='kw'>else</span> {
           <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
               <span class='ident'>Put</span> <span class='op'>|</span> <span class='ident'>Delete</span> <span class='op'>=&gt;</span> <span class='bool-val'>true</span>,
               _ <span class='op'>=&gt;</span> <span class='bool-val'>false</span>
           }
       }
   }
}

<span class='kw'>impl</span> <span class='ident'>FromStr</span> <span class='kw'>for</span> <span class='ident'>Method</span> {
   <span class='kw'>type</span> <span class='prelude-val'>Err</span> <span class='op'>=</span> <span class='ident'>Error</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'>Method</span>, <span class='ident'>Error</span><span class='op'>&gt;</span> {
       <span class='kw'>if</span> <span class='ident'>s</span> <span class='op'>==</span> <span class='string'>&quot;&quot;</span> {
           <span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>Method</span>)
       } <span class='kw'>else</span> {
           <span class='prelude-val'>Ok</span>(<span class='kw'>match</span> <span class='ident'>s</span> {
               <span class='string'>&quot;OPTIONS&quot;</span> <span class='op'>=&gt;</span> <span class='ident'>Options</span>,
               <span class='string'>&quot;GET&quot;</span> <span class='op'>=&gt;</span> <span class='ident'>Get</span>,
               <span class='string'>&quot;POST&quot;</span> <span class='op'>=&gt;</span> <span class='ident'>Post</span>,
               <span class='string'>&quot;PUT&quot;</span> <span class='op'>=&gt;</span> <span class='ident'>Put</span>,
               <span class='string'>&quot;DELETE&quot;</span> <span class='op'>=&gt;</span> <span class='ident'>Delete</span>,
               <span class='string'>&quot;HEAD&quot;</span> <span class='op'>=&gt;</span> <span class='ident'>Head</span>,
               <span class='string'>&quot;TRACE&quot;</span> <span class='op'>=&gt;</span> <span class='ident'>Trace</span>,
               <span class='string'>&quot;CONNECT&quot;</span> <span class='op'>=&gt;</span> <span class='ident'>Connect</span>,
               <span class='string'>&quot;PATCH&quot;</span> <span class='op'>=&gt;</span> <span class='ident'>Patch</span>,
               _ <span class='op'>=&gt;</span> <span class='ident'>Extension</span>(<span class='ident'>s</span>.<span class='ident'>to_owned</span>())
           })
       }
   }
}

<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Method</span> {
   <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>fmt</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
       <span class='ident'>fmt</span>.<span class='ident'>write_str</span>(<span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
           <span class='ident'>Options</span> <span class='op'>=&gt;</span> <span class='string'>&quot;OPTIONS&quot;</span>,
           <span class='ident'>Get</span> <span class='op'>=&gt;</span> <span class='string'>&quot;GET&quot;</span>,
           <span class='ident'>Post</span> <span class='op'>=&gt;</span> <span class='string'>&quot;POST&quot;</span>,
           <span class='ident'>Put</span> <span class='op'>=&gt;</span> <span class='string'>&quot;PUT&quot;</span>,
           <span class='ident'>Delete</span> <span class='op'>=&gt;</span> <span class='string'>&quot;DELETE&quot;</span>,
           <span class='ident'>Head</span> <span class='op'>=&gt;</span> <span class='string'>&quot;HEAD&quot;</span>,
           <span class='ident'>Trace</span> <span class='op'>=&gt;</span> <span class='string'>&quot;TRACE&quot;</span>,
           <span class='ident'>Connect</span> <span class='op'>=&gt;</span> <span class='string'>&quot;CONNECT&quot;</span>,
           <span class='ident'>Patch</span> <span class='op'>=&gt;</span> <span class='string'>&quot;PATCH&quot;</span>,
           <span class='ident'>Extension</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span> <span class='ident'>s</span>.<span class='ident'>as_ref</span>()
       })
   }
}

<span class='kw'>impl</span> <span class='ident'>Default</span> <span class='kw'>for</span> <span class='ident'>Method</span> {
   <span class='kw'>fn</span> <span class='ident'>default</span>() <span class='op'>-&gt;</span> <span class='ident'>Method</span> {
       <span class='ident'>Method</span>::<span class='ident'>Get</span>
   }
}
</pre>
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