add DSL CSS scanner

1 files changed, 125 insertions, 0 deletions

diff --git a/lib/coderay/scanners/css2.rb b/lib/coderay/scanners/css2.rb
new file mode 100644
index 0000000..a072c9e
--- /dev/null
+++ b/lib/coderay/scanners/css2.rb
@@ -0,0 +1,125 @@
+require_relative 'java_script5'
+
+module CodeRay
+module Scanners
+
+  class CSS2 < RuleBasedScanner6
+    
+    register_for :css2
+    
+    KINDS_NOT_LOC = [
+      :comment,
+      :class, :pseudo_class, :tag,
+      :id, :directive,
+      :key, :value, :operator, :color, :float, :string,
+      :error, :important, :type,
+    ]  # :nodoc:
+    
+    module RE  # :nodoc:
+      Hex = /[0-9a-fA-F]/
+      Unicode = /\\#{Hex}{1,6}\b/ # differs from standard because it allows uppercase hex too
+      Escape = /#{Unicode}|\\[^\n0-9a-fA-F]/
+      NMChar = /[-_a-zA-Z0-9]/
+      NMStart = /[_a-zA-Z]/
+      String1 = /(")((?:[^\n\\"]+|\\\n|#{Escape})+)?(")?/  # TODO: buggy regexp
+      String2 = /(')((?:[^\n\\']+|\\\n|#{Escape})+)?(')?/  # TODO: buggy regexp
+      String = /#{String1}|#{String2}/
+      
+      HexColor = /#(?:#{Hex}{6}|#{Hex}{3})/
+      
+      Num = /-?(?:[0-9]*\.[0-9]+|[0-9]+)n?/
+      Name = /#{NMChar}+/
+      Ident = /-?#{NMStart}#{NMChar}*/
+      AtKeyword = /@#{Ident}/
+      Percentage = /#{Num}%/
+      
+      reldimensions = %w[em ex px]
+      absdimensions = %w[in cm mm pt pc]
+      Unit = Regexp.union(*(reldimensions + absdimensions + %w[s dpi dppx deg]))
+      
+      Dimension = /#{Num}#{Unit}/
+      
+      Function = /((?:url|alpha|attr|counters?)\()((?:[^)\n]|\\\))+)?(\))?/
+      
+      Id = /(?!#{HexColor}\b(?!-))##{Name}/
+      Class = /\.#{Name}/
+      PseudoClass = /::?#{Ident}/
+      AttributeSelector = /(\[)([^\]]+)?(\])?/
+    end
+    
+  protected
+    
+    def setup
+      @state = :initial
+      @value_expected = false
+      @block = false
+    end
+    
+    state :initial do
+      on %r/\s+/, :space
+      
+      on check_if(:block), check_if(:value_expected), %r/(?>#{RE::Ident})(?!\()/x, :value
+      on check_if(:block), %r/(?>#{RE::Ident})(?!\()/x, :key
+      
+      on check_unless(:block), %r/(?>#{RE::Ident})(?!\()|\*/x, :tag
+      on check_unless(:block), RE::Class, :class
+      on check_unless(:block), RE::Id, :id
+      on check_unless(:block), RE::PseudoClass, :pseudo_class
+      # TODO: Improve highlighting inside of attribute selectors.
+      on check_unless(:block), RE::AttributeSelector, groups(:operator, :attribute_name, :operator)
+      on check_unless(:block), %r/(@media)(\s+)?(#{RE::Ident})?(\s+)?(\{)?/, groups(:directive, :space, :type, :space, :operator)
+      
+      on %r/\/\*(?:.*?\*\/|\z)/m, :comment
+      on %r/\{/, :operator, flag_off(:value_expected), flag_on(:block)
+      on %r/\}/, :operator, flag_off(:value_expected), flag_off(:block)
+      on RE::String1, push(:string), groups(:delimiter, :content, :delimiter), pop
+      on RE::String2, push(:string), groups(:delimiter, :content, :delimiter), pop
+      on RE::Function, push(:function), groups(:delimiter, :content, :delimiter), pop
+      on %r/(?: #{RE::Dimension} | #{RE::Percentage} | #{RE::Num} )/x, :float
+      on RE::HexColor, :color
+      on %r/! *important/, :important
+      on %r/(?:rgb|hsl)a?\([^()\n]*\)?/, :color
+      on RE::AtKeyword, :directive
+      on %r/:/, :operator, flag_on(:value_expected)
+      on %r/;/, :operator, flag_off(:value_expected)
+      on %r/ [+>~,.=()\/] /x, :operator
+    end
+    
+    scan_tokens_code = <<-"RUBY"
+    def scan_tokens encoder, options#{ def_line = __LINE__; nil }
+      states = Array(options[:state] || @state).dup
+      value_expected = @value_expected
+      block = @block
+      
+      until eos?
+        
+        case state
+        
+#{ @code.chomp.gsub(/^/, '        ') }
+        else
+          raise_inspect 'Unknown state: %p' % [state], encoder
+          
+        end
+        
+      end
+      
+      if options[:keep_state]
+        @state = states
+        @value_expected = value_expected
+        @block = block
+      end
+      
+      encoder
+    end
+    RUBY
+    
+    if ENV['PUTS']
+      puts scan_tokens_code
+      puts "callbacks: #{@callbacks.size}"
+    end
+    class_eval scan_tokens_code, __FILE__, def_line
+    
+  end
+  
+end
+end