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<pre><span class="ruby-comment cmt"># File lib/action_controller/vendor/html-scanner/html/selector.rb, line 239</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">initialize</span>(<span class="ruby-identifier">selector</span>, <span class="ruby-operator">*</span><span class="ruby-identifier">values</span>)
<span class="ruby-identifier">raise</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-value str">"CSS expression cannot be empty"</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">selector</span>.<span class="ruby-identifier">empty?</span>
<span class="ruby-ivar">@source</span> = <span class="ruby-value str">""</span>
<span class="ruby-identifier">values</span> = <span class="ruby-identifier">values</span>[<span class="ruby-value">0</span>] <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">values</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">==</span> <span class="ruby-value">1</span> <span class="ruby-operator">&&</span> <span class="ruby-identifier">values</span>[<span class="ruby-value">0</span>].<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Array</span>)
<span class="ruby-comment cmt"># We need a copy to determine if we failed to parse, and also</span>
<span class="ruby-comment cmt"># preserve the original pass by-ref statement.</span>
<span class="ruby-identifier">statement</span> = <span class="ruby-identifier">selector</span>.<span class="ruby-identifier">strip</span>.<span class="ruby-identifier">dup</span>
<span class="ruby-comment cmt"># Create a simple selector, along with negation.</span>
<span class="ruby-identifier">simple_selector</span>(<span class="ruby-identifier">statement</span>, <span class="ruby-identifier">values</span>).<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">name</span>, <span class="ruby-identifier">value</span><span class="ruby-operator">|</span> <span class="ruby-identifier">instance_variable_set</span>(<span class="ruby-node">"@#{name}"</span>, <span class="ruby-identifier">value</span>) }
<span class="ruby-ivar">@alternates</span> = []
<span class="ruby-ivar">@depends</span> = <span class="ruby-keyword kw">nil</span>
<span class="ruby-comment cmt"># Alternative selector.</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">statement</span>.<span class="ruby-identifier">sub!</span>(<span class="ruby-regexp re">/^\s*,\s*/</span>, <span class="ruby-value str">""</span>)
<span class="ruby-identifier">second</span> = <span class="ruby-constant">Selector</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">statement</span>, <span class="ruby-identifier">values</span>)
<span class="ruby-ivar">@alternates</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">second</span>
<span class="ruby-comment cmt"># If there are alternate selectors, we group them in the top selector.</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">alternates</span> = <span class="ruby-identifier">second</span>.<span class="ruby-identifier">instance_variable_get</span>(<span class="ruby-identifier">:@alternates</span>)
<span class="ruby-identifier">second</span>.<span class="ruby-identifier">instance_variable_set</span>(<span class="ruby-identifier">:@alternates</span>, [])
<span class="ruby-ivar">@alternates</span>.<span class="ruby-identifier">concat</span> <span class="ruby-identifier">alternates</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-ivar">@source</span> <span class="ruby-operator"><<</span> <span class="ruby-value str">" , "</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">second</span>.<span class="ruby-identifier">to_s</span>
<span class="ruby-comment cmt"># Sibling selector: create a dependency into second selector that will</span>
<span class="ruby-comment cmt"># match element immediately following this one.</span>
<span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">statement</span>.<span class="ruby-identifier">sub!</span>(<span class="ruby-regexp re">/^\s*\+\s*/</span>, <span class="ruby-value str">""</span>)
<span class="ruby-identifier">second</span> = <span class="ruby-identifier">next_selector</span>(<span class="ruby-identifier">statement</span>, <span class="ruby-identifier">values</span>)
<span class="ruby-ivar">@depends</span> = <span class="ruby-identifier">lambda</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">element</span>, <span class="ruby-identifier">first</span><span class="ruby-operator">|</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">element</span> = <span class="ruby-identifier">next_element</span>(<span class="ruby-identifier">element</span>)
<span class="ruby-identifier">second</span>.<span class="ruby-identifier">match</span>(<span class="ruby-identifier">element</span>, <span class="ruby-identifier">first</span>)
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-ivar">@source</span> <span class="ruby-operator"><<</span> <span class="ruby-value str">" + "</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">second</span>.<span class="ruby-identifier">to_s</span>
<span class="ruby-comment cmt"># Adjacent selector: create a dependency into second selector that will</span>
<span class="ruby-comment cmt"># match all elements following this one.</span>
<span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">statement</span>.<span class="ruby-identifier">sub!</span>(<span class="ruby-regexp re">/^\s*~\s*/</span>, <span class="ruby-value str">""</span>)
<span class="ruby-identifier">second</span> = <span class="ruby-identifier">next_selector</span>(<span class="ruby-identifier">statement</span>, <span class="ruby-identifier">values</span>)
<span class="ruby-ivar">@depends</span> = <span class="ruby-identifier">lambda</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">element</span>, <span class="ruby-identifier">first</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">matches</span> = []
<span class="ruby-keyword kw">while</span> <span class="ruby-identifier">element</span> = <span class="ruby-identifier">next_element</span>(<span class="ruby-identifier">element</span>)
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">subset</span> = <span class="ruby-identifier">second</span>.<span class="ruby-identifier">match</span>(<span class="ruby-identifier">element</span>, <span class="ruby-identifier">first</span>)
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">first</span> <span class="ruby-operator">&&</span> <span class="ruby-operator">!</span><span class="ruby-identifier">subset</span>.<span class="ruby-identifier">empty?</span>
<span class="ruby-identifier">matches</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">subset</span>.<span class="ruby-identifier">first</span>
<span class="ruby-keyword kw">break</span>
<span class="ruby-keyword kw">else</span>
<span class="ruby-identifier">matches</span>.<span class="ruby-identifier">concat</span> <span class="ruby-identifier">subset</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-identifier">matches</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-value">? </span><span class="ruby-keyword kw">nil</span> <span class="ruby-operator">:</span> <span class="ruby-identifier">matches</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-ivar">@source</span> <span class="ruby-operator"><<</span> <span class="ruby-value str">" ~ "</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">second</span>.<span class="ruby-identifier">to_s</span>
<span class="ruby-comment cmt"># Child selector: create a dependency into second selector that will</span>
<span class="ruby-comment cmt"># match a child element of this one.</span>
<span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">statement</span>.<span class="ruby-identifier">sub!</span>(<span class="ruby-regexp re">/^\s*>\s*/</span>, <span class="ruby-value str">""</span>)
<span class="ruby-identifier">second</span> = <span class="ruby-identifier">next_selector</span>(<span class="ruby-identifier">statement</span>, <span class="ruby-identifier">values</span>)
<span class="ruby-ivar">@depends</span> = <span class="ruby-identifier">lambda</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">element</span>, <span class="ruby-identifier">first</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">matches</span> = []
<span class="ruby-identifier">element</span>.<span class="ruby-identifier">children</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">child</span><span class="ruby-operator">|</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">child</span>.<span class="ruby-identifier">tag?</span> <span class="ruby-operator">&&</span> <span class="ruby-identifier">subset</span> = <span class="ruby-identifier">second</span>.<span class="ruby-identifier">match</span>(<span class="ruby-identifier">child</span>, <span class="ruby-identifier">first</span>)
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">first</span> <span class="ruby-operator">&&</span> <span class="ruby-operator">!</span><span class="ruby-identifier">subset</span>.<span class="ruby-identifier">empty?</span>
<span class="ruby-identifier">matches</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">subset</span>.<span class="ruby-identifier">first</span>
<span class="ruby-keyword kw">break</span>
<span class="ruby-keyword kw">else</span>
<span class="ruby-identifier">matches</span>.<span class="ruby-identifier">concat</span> <span class="ruby-identifier">subset</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-identifier">matches</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-value">? </span><span class="ruby-keyword kw">nil</span> <span class="ruby-operator">:</span> <span class="ruby-identifier">matches</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-ivar">@source</span> <span class="ruby-operator"><<</span> <span class="ruby-value str">" > "</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">second</span>.<span class="ruby-identifier">to_s</span>
<span class="ruby-comment cmt"># Descendant selector: create a dependency into second selector that</span>
<span class="ruby-comment cmt"># will match all descendant elements of this one. Note,</span>
<span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">statement</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/^\s+\S+/</span> <span class="ruby-operator">&&</span> <span class="ruby-identifier">statement</span> <span class="ruby-operator">!=</span> <span class="ruby-identifier">selector</span>
<span class="ruby-identifier">second</span> = <span class="ruby-identifier">next_selector</span>(<span class="ruby-identifier">statement</span>, <span class="ruby-identifier">values</span>)
<span class="ruby-ivar">@depends</span> = <span class="ruby-identifier">lambda</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">element</span>, <span class="ruby-identifier">first</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">matches</span> = []
<span class="ruby-identifier">stack</span> = <span class="ruby-identifier">element</span>.<span class="ruby-identifier">children</span>.<span class="ruby-identifier">reverse</span>
<span class="ruby-keyword kw">while</span> <span class="ruby-identifier">node</span> = <span class="ruby-identifier">stack</span>.<span class="ruby-identifier">pop</span>
<span class="ruby-keyword kw">next</span> <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">node</span>.<span class="ruby-identifier">tag?</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">subset</span> = <span class="ruby-identifier">second</span>.<span class="ruby-identifier">match</span>(<span class="ruby-identifier">node</span>, <span class="ruby-identifier">first</span>)
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">first</span> <span class="ruby-operator">&&</span> <span class="ruby-operator">!</span><span class="ruby-identifier">subset</span>.<span class="ruby-identifier">empty?</span>
<span class="ruby-identifier">matches</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">subset</span>.<span class="ruby-identifier">first</span>
<span class="ruby-keyword kw">break</span>
<span class="ruby-keyword kw">else</span>
<span class="ruby-identifier">matches</span>.<span class="ruby-identifier">concat</span> <span class="ruby-identifier">subset</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">children</span> = <span class="ruby-identifier">node</span>.<span class="ruby-identifier">children</span>
<span class="ruby-identifier">stack</span>.<span class="ruby-identifier">concat</span> <span class="ruby-identifier">children</span>.<span class="ruby-identifier">reverse</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-identifier">matches</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-value">? </span><span class="ruby-keyword kw">nil</span> <span class="ruby-operator">:</span> <span class="ruby-identifier">matches</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-ivar">@source</span> <span class="ruby-operator"><<</span> <span class="ruby-value str">" "</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">second</span>.<span class="ruby-identifier">to_s</span>
<span class="ruby-keyword kw">else</span>
<span class="ruby-comment cmt"># The last selector is where we check that we parsed</span>
<span class="ruby-comment cmt"># all the parts.</span>
<span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">statement</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">statement</span>.<span class="ruby-identifier">strip</span>.<span class="ruby-identifier">empty?</span>
<span class="ruby-identifier">raise</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-node">"Invalid selector: #{statement}"</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span></pre>
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Mandriva
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2010.0
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