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<title>select_best_encoding (lib/rack/utils.rb)</title>
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<pre><span class="ruby-comment cmt"># File lib/rack/utils.rb, line 246</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">select_best_encoding</span>(<span class="ruby-identifier">available_encodings</span>, <span class="ruby-identifier">accept_encoding</span>)
<span class="ruby-comment cmt"># http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html</span>
<span class="ruby-identifier">expanded_accept_encoding</span> =
<span class="ruby-identifier">accept_encoding</span>.<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">m</span>, <span class="ruby-identifier">q</span><span class="ruby-operator">|</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">m</span> <span class="ruby-operator">==</span> <span class="ruby-value str">"*"</span>
(<span class="ruby-identifier">available_encodings</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">accept_encoding</span>.<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">m2</span>, <span class="ruby-identifier">_</span><span class="ruby-operator">|</span> <span class="ruby-identifier">m2</span> }).<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">m2</span><span class="ruby-operator">|</span> [<span class="ruby-identifier">m2</span>, <span class="ruby-identifier">q</span>] }
<span class="ruby-keyword kw">else</span>
[[<span class="ruby-identifier">m</span>, <span class="ruby-identifier">q</span>]]
<span class="ruby-keyword kw">end</span>
}.<span class="ruby-identifier">inject</span>([]) { <span class="ruby-operator">|</span><span class="ruby-identifier">mem</span>, <span class="ruby-identifier">list</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">mem</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">list</span>
}
<span class="ruby-identifier">encoding_candidates</span> = <span class="ruby-identifier">expanded_accept_encoding</span>.<span class="ruby-identifier">sort_by</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">_</span>, <span class="ruby-identifier">q</span><span class="ruby-operator">|</span> <span class="ruby-operator">-</span><span class="ruby-identifier">q</span> }.<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">m</span>, <span class="ruby-identifier">_</span><span class="ruby-operator">|</span> <span class="ruby-identifier">m</span> }
<span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">encoding_candidates</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-value str">"identity"</span>)
<span class="ruby-identifier">encoding_candidates</span>.<span class="ruby-identifier">push</span>(<span class="ruby-value str">"identity"</span>)
<span class="ruby-keyword kw">end</span>
<span class="ruby-identifier">expanded_accept_encoding</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">m</span>, <span class="ruby-identifier">q</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">encoding_candidates</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-identifier">m</span>) <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">q</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span><span class="ruby-value">.0</span>
}
<span class="ruby-keyword kw">return</span> (<span class="ruby-identifier">encoding_candidates</span> <span class="ruby-operator">&</span> <span class="ruby-identifier">available_encodings</span>)[<span class="ruby-value">0</span>]
<span class="ruby-keyword kw">end</span></pre>
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