[Sass] Add a bunch of regexps for lexing CSS.

lib/sass/scss/rx.rb

@@ -0,0 +1,59 @@
+module Sass
+  module SCSS
+    module RX
+      def self.quote(str, flags = 0)
+        Regexp.new(Regexp.quote(str), flags)
+      end
+
+      H        = /[0-9a-f]/i
+      NL       = /\n|\r\n|\r|\f/
+      NONASCII = /[\200-\377]/
+      UNICODE  = /\\#{H}{1,6}[ \t\r\n\f]?/
+      ESCAPE   = /#{UNICODE}|\\[ -~\200-\377]/
+      NMSTART  = /[a-z]|#{NONASCII}|#{ESCAPE}/i
+      NMCHAR   = /[a-z0-9-]|#{NONASCII}|#{ESCAPE}/i
+      STRING1  = /\"([\t !#%$&(-~]|\\#{NL}|\'|#{NONASCII}|#{ESCAPE})*\"/
+      STRING2  = /\'([\t !#%$&(-~]|\\#{NL}|\"|#{NONASCII}|#{ESCAPE})*\'/
+
+      IDENT    = /[-]?#{NMSTART}#{NMCHAR}*/
+      NAME     = /#{NMCHAR}+/
+      NUM      = /[0-9]+|[0-9]*.[0-9]+/
+      STRING   = /#{STRING1}|#{STRING2}/
+      URL      = /([!#%$&*-~]|#{NONASCII}|#{ESCAPE})*/
+      W        = /[ \t\r\n\f]*/
+      RANGE    = /\?{1,6}|#{H}(\?{0,5}|#{H}(\?{0,4}|#{H}(\?{0,3}|#{H}(\?{0,2}|#{H}(\??|#{H})))))/
+
+      ##
+
+      S = /[ \t\r\n\f]+/
+
+      COMMENT = /\/\*[^*]*\*+([^\/][^*]*\*+)*\//
+
+      CDO            = quote("<!--")
+      CDC            = quote("-->")
+      INCLUDES       = quote("~=")
+      DASHMATCH      = quote("|=")
+      PREFIXMATCH    = quote("^=")
+      SUFFIXMATCH    = quote("$=")
+      SUBSTRINGMATCH = quote("*=")
+
+      HASH = /##{NAME}/
+
+      IMPORT    = quote("@import", Regexp::IGNORECASE)
+      PAGE      = quote("@page", Regexp::IGNORECASE)
+      MEDIA     = quote("@media", Regexp::IGNORECASE)
+      FONT_FACE = quote("@font-face", Regexp::IGNORECASE)
+      CHARSET   = quote("@charset", Regexp::IGNORECASE)
+      NAMESPACE = quote("@namespace", Regexp::IGNORECASE)
+
+      IMPORTANT = /!#{W}important/i
+
+      NUMBER = /#{NUM}(#{IDENT}|%)?/
+
+      URI = /url\(#{W}(#{STRING}|#{URL})#{W}\)/i
+      FUNCTION = /#{IDENT}\(/
+
+      UNICODERANGE = /u\+(#{RANGE}|#{H}{1,6}-#{H}{1,6})/
+    end
+  end
+end