Replace CFile builder with Yacc and Lex builders - close #166

lib/rscons/builders/yacc.rb

@@ -0,0 +1,24 @@
+module Rscons
+  module Builders
+    # Build a source file given a yacc input file.
+    #
+    # Examples::
+    #   env.Yacc("parser.c", "parser.y")
+    #   env.Yacc("parser.cc", "parser.yy")
+    class Yacc < Builder
+
+      # Run the builder to produce a build target.
+      def run(options)
+        if @command
+          finalize_command
+        else
+          @vars["_TARGET"] = @target
+          @vars["_SOURCES"] = @sources
+          command = @env.build_command("${YACC_CMD}", @vars)
+          standard_command("Generating parser source from <source>#{Util.short_format_paths(@sources)}<reset> => <target>#{@target}<reset>", command)
+        end
+      end
+
+    end
+  end
+end