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<title>call (Rack::MatrixParams)</title>
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<pre><span class="ruby-comment cmt"># File lib/sinatra/rack_matrix_params.rb, line 40</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
<span class="ruby-comment cmt"># Copy PATH_INFO to REQUEST_URI if Rack::Test</span>
<span class="ruby-identifier">env</span>[<span class="ruby-value str">'REQUEST_URI'</span>] = <span class="ruby-identifier">env</span>[<span class="ruby-value str">'PATH_INFO'</span>] <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">env</span>[<span class="ruby-value str">'rack.test'</span>]
<span class="ruby-identifier">env</span>[<span class="ruby-value str">'REQUEST_PATH'</span>] = <span class="ruby-identifier">env</span>[<span class="ruby-value str">'PATH_INFO'</span>] <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">env</span>[<span class="ruby-value str">'rack.test'</span>]
<span class="ruby-comment cmt"># Split URI to components and then extract ;var=value pairs</span>
<span class="ruby-identifier">uri_components</span> = <span class="ruby-identifier">env</span>[<span class="ruby-value str">'REQUEST_URI'</span>].<span class="ruby-identifier">split</span>(<span class="ruby-value str">'/'</span>)
<span class="ruby-identifier">matrix_params</span> = {}
<span class="ruby-identifier">uri_components</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">component</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">sub_components</span>, <span class="ruby-identifier">value</span> = <span class="ruby-identifier">component</span>.<span class="ruby-identifier">split</span>(<span class="ruby-regexp re">/\;(\w+)\=/</span>), <span class="ruby-keyword kw">nil</span>
<span class="ruby-keyword kw">next</span> <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">sub_components</span>.<span class="ruby-identifier">first</span> <span class="ruby-comment cmt"># Skip subcomponent if it's empty (usually /)</span>
<span class="ruby-keyword kw">while</span> <span class="ruby-identifier">param</span>=<span class="ruby-identifier">sub_components</span>.<span class="ruby-identifier">pop</span> <span class="ruby-keyword kw">do</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">value</span>
<span class="ruby-identifier">matrix_params</span>[<span class="ruby-identifier">sub_components</span>.<span class="ruby-identifier">first</span>] <span class="ruby-operator">||=</span> {}
<span class="ruby-identifier">matrix_params</span>[<span class="ruby-identifier">sub_components</span>.<span class="ruby-identifier">first</span>].<span class="ruby-identifier">merge!</span>(
<span class="ruby-identifier">param</span> =<span class="ruby-operator">></span> <span class="ruby-identifier">value</span>
)
<span class="ruby-identifier">value</span>=<span class="ruby-keyword kw">nil</span>
<span class="ruby-keyword kw">next</span>
<span class="ruby-keyword kw">else</span>
<span class="ruby-identifier">value</span> = <span class="ruby-identifier">param</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp re">/\?.*$/</span>, <span class="ruby-value str">''</span>)
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-comment cmt"># Two things need to happen to make matrix params work:</span>
<span class="ruby-comment cmt"># (1) the parameters need to be appended to the 'normal' params</span>
<span class="ruby-comment cmt"># for the request. 'Normal' really depends on the content</span>
<span class="ruby-comment cmt"># type of the request, which does not seem accessible from</span>
<span class="ruby-comment cmt"># Middleware, so we use the existence of</span>
<span class="ruby-comment cmt"># rack.request.form_hash in the environment to distinguish</span>
<span class="ruby-comment cmt"># between basic and application/x-www-form-urlencoded</span>
<span class="ruby-comment cmt"># requests</span>
<span class="ruby-comment cmt"># (2) the parameters need to be stripped from the appropriate</span>
<span class="ruby-comment cmt"># path related env variables, so that request dispatching</span>
<span class="ruby-comment cmt"># does not trip over them</span>
<span class="ruby-comment cmt"># (1) Rewrite current path by stripping all matrix params from it</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">env</span>[<span class="ruby-value str">'REQUEST_PATH'</span>] <span class="ruby-operator">==</span> <span class="ruby-value str">'/'</span>
<span class="ruby-identifier">env</span>[<span class="ruby-value str">'REQUEST_URI'</span>] = <span class="ruby-identifier">env</span>[<span class="ruby-value str">'REQUEST_PATH'</span>]
<span class="ruby-identifier">env</span>[<span class="ruby-value str">'REQUEST_PATH'</span>] = <span class="ruby-identifier">env</span>[<span class="ruby-value str">'PATH_INFO'</span>]
<span class="ruby-keyword kw">end</span>
<span class="ruby-identifier">env</span>[<span class="ruby-value str">'REQUEST_PATH'</span>] = <span class="ruby-identifier">env</span>[<span class="ruby-value str">'REQUEST_PATH'</span>].<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp re">/;([^\/]*)/</span>, <span class="ruby-value str">''</span>).<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp re">/\?(.*)$/</span>, <span class="ruby-value str">''</span>)
<span class="ruby-identifier">env</span>[<span class="ruby-value str">'PATH_INFO'</span>] = <span class="ruby-identifier">env</span>[<span class="ruby-value str">'REQUEST_PATH'</span>]
<span class="ruby-comment cmt"># (2) Append the matrix params to the 'normal' request params</span>
<span class="ruby-comment cmt"># FIXME: Make this work for multipart/form-data</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">env</span>[<span class="ruby-value str">'rack.request.form_hash'</span>]
<span class="ruby-comment cmt"># application/x-www-form-urlencoded, most likely a POST</span>
<span class="ruby-identifier">env</span>[<span class="ruby-value str">'rack.request.form_hash'</span>].<span class="ruby-identifier">merge!</span>(<span class="ruby-identifier">matrix_params</span>)
<span class="ruby-keyword kw">else</span>
<span class="ruby-comment cmt"># For other methods it's more complicated</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">env</span>[<span class="ruby-value str">'REQUEST_METHOD'</span>]<span class="ruby-operator">!=</span><span class="ruby-value str">'POST'</span> <span class="ruby-keyword kw">and</span> <span class="ruby-keyword kw">not</span> <span class="ruby-identifier">matrix_params</span>.<span class="ruby-identifier">keys</span>.<span class="ruby-identifier">empty?</span>
<span class="ruby-identifier">env</span>[<span class="ruby-value str">'QUERY_STRING'</span>].<span class="ruby-identifier">gsub!</span>(<span class="ruby-regexp re">/;([^\/]*)/</span>, <span class="ruby-value str">''</span>)
<span class="ruby-identifier">new_params</span> = <span class="ruby-identifier">matrix_params</span>.<span class="ruby-identifier">collect</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">component</span>, <span class="ruby-identifier">params</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">params</span>.<span class="ruby-identifier">collect</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">k</span>,<span class="ruby-identifier">v</span><span class="ruby-operator">|</span> <span class="ruby-node">"#{component}[#{k}]=#{CGI::escape(v.to_s)}"</span> }
<span class="ruby-keyword kw">end</span>.<span class="ruby-identifier">flatten</span>
<span class="ruby-comment cmt"># Add matrix params as a regular GET params</span>
<span class="ruby-identifier">env</span>[<span class="ruby-value str">'QUERY_STRING'</span>] <span class="ruby-operator">+=</span> <span class="ruby-value str">'&'</span> <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">not</span> <span class="ruby-identifier">env</span>[<span class="ruby-value str">'QUERY_STRING'</span>].<span class="ruby-identifier">empty?</span>
<span class="ruby-identifier">env</span>[<span class="ruby-value str">'QUERY_STRING'</span>] <span class="ruby-operator">+=</span> <span class="ruby-node">"#{new_params.join('&')}"</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-ivar">@app</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
<span class="ruby-keyword kw">end</span></pre>
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