Initial revision

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3925 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rexml/parseexception.rb

@@ -0,0 +1,44 @@
+module REXML
+	class ParseException < Exception
+		attr_accessor :source, :parser, :continued_exception
+
+		def initialize( message, source=nil, parser=nil, exception=nil )
+			super(message)
+			@source = source
+			@parser = parser
+			@continued_exception = exception
+		end
+
+		def to_s
+			# Quote the original exception, if there was one
+			if @continued_exception
+				err = @continued_exception.message
+				err << "\n"
+				err << @continued_exception.backtrace[0..3].join("\n")
+				err << "\n...\n"
+			else
+				err = ""
+			end
+
+			# Get the stack trace and error message
+			err << super
+
+			# Add contextual information
+			err << "\n#{@source.current_line}\nLast 80 unconsumed characters:\n#{@source.buffer[0..80].gsub(/\n/, ' ')}\n" if @source
+			err << "\nContext:\n#{@parser.context}" if @parser
+			err
+		end
+
+		def position
+			@source.current_line[0] if @source
+		end
+
+		def line
+			@source.current_line[2] if @source
+		end
+
+		def context
+			@source.current_line
+		end
+	end	
+end