Added fields to denote all the characters that an 'allChars' postfixNode _shouldn't_ represent (useful for inverting character classes)

postfixNode.go

@@ -26,7 +26,8 @@ type postfixNode struct {
 	contents  []rune // Contents of the node - the length of this would only be >1 if the node represents a character class
 	startReps int    // Minimum number of times the node should be repeated - used with numeric specifiers
 	endReps   int    // Maximum number of times the node should be repeated - used with numeric specifiers
-	isDot     bool   // Whether or not the current node represents a 'dot' metacharacter
+	allChars  bool   // Whether or not the current node represents all characters (eg. dot metacharacter)
+	except    []rune // For inverted character classes, we match every unicode character _except_ a few. In this case, allChars is true and the exceptions are placed here.
 }
 
 // Creates a new escaped node - the given character is assumed to have been preceded by a backslash
@@ -115,7 +116,7 @@ func newPostfixDotNode() postfixNode {
 	toReturn.startReps = 1
 	toReturn.endReps = 1
 	toReturn.nodetype = CHARACTER
-	toReturn.isDot = true
+	toReturn.allChars = true
 	toReturn.contents = []rune{ANY_CHAR}
 	return toReturn
 }