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POHow to use SASS to parse a list of all CSS selectors in an .scss file?
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  1. POHow to use SASS to parse a list of all CSS selectors in an .scss file?
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    copied!<p>I'd like to programmatically parse an .scss file to generate a flat list of selectors that are used in that file, mostly as basis for some static code analysis.</p> <p>In SASS terms, I'm looking for a way to get a list of all <code>Sass::Tree::RuleNode</code> for a given .scss file. </p> <p>So far I'm using <code>Sass::Engine.for_file</code> to create a Tree. Then, in order to use <code>Sass::Tree::RuleNode.resolved_rules</code> on the individual Nodes I have to use <code>Tree::Visitors::Cssize</code>, according to the documentation. But somewhere in there is a (probably simple) error.</p> <pre><code>require 'sass' sass_engine = Sass::Engine.for_file('files/examples.scss',{ :style =&gt; :compact, :load_paths =&gt; ['files'], :syntax =&gt; :scss, }) tree = sass_engine.to_tree Sass::Tree::Visitors::Cssize.visit(tree) tree.each do |node| if node.is_a? Sass::Tree::RuleNode puts node.resolved_rules end end </code></pre> <p>This is the error and stacktrace I'm getting:</p> <pre><code>ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/cssize.rb:186:in `visit_prop': undefined method `empty?' for nil:NilClass (NoMethodError) ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/base.rb:37:in `visit' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/cssize.rb:21:in `visit' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/base.rb:53:in `block in visit_children' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/base.rb:53:in `map' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/base.rb:53:in `visit_children' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/cssize.rb:30:in `block in visit_children' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/cssize.rb:52:in `with_parent' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/cssize.rb:29:in `visit_children' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/base.rb:37:in `block in visit' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/cssize.rb:201:in `visit_rule' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/base.rb:37:in `visit' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/cssize.rb:21:in `visit' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/base.rb:53:in `block in visit_children' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/base.rb:53:in `map' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/base.rb:53:in `visit_children' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/cssize.rb:30:in `block in visit_children' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/cssize.rb:52:in `with_parent' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/cssize.rb:29:in `visit_children' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/base.rb:37:in `block in visit' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/cssize.rb:65:in `visit_root' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/base.rb:37:in `visit' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/cssize.rb:21:in `visit' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/base.rb:24:in `visit' ruby-1.9.3-p362/gems/sass-3.2.10/lib/sass/tree/visitors/cssize.rb:6:in `visit' </code></pre> <p>Thanks a lot in advance.</p>
 

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