WIP - fixing character classes

compile.go

@@ -82,6 +82,7 @@ func shuntingYard(re string, flags ...ReFlag) ([]postfixNode, error) {
 	// Also check for non-capturing groups. The LPAREN of a non-capturing group looks like this: '(?:'
 	// I take this out, and put in a special character - NONCAPLPAREN_CHAR.
 	//
+	// Another check is made for unescaped brackets - opening brackets are replaced with LBRACKET and closing brackets are replaced with RBRACKET.
 	// Finally, check for escaped backslashes. Replace these with the BACKSLASH metacharacter. Later, in thompson(),
 	// these will be converted back. This avoids confusiuon in detecting whether a character is escaped eg. detecting
 	// whether '\\[a]' has an escaped opening bracket (it doesn't).
@@ -122,6 +123,9 @@ func shuntingYard(re string, flags ...ReFlag) ([]postfixNode, error) {
 		} else if c == '\\' && i < len(re_runes_orig)-1 && re_runes_orig[i+1] == '\\' { // Escaped backslash
 			re_runes = append(re_runes, ESC_BACKSLASH)
 			i++
+		} else if c == '[' && (i == 0 || re_runes_orig[i-1] != '\\')
+
+
 		} else {
 			re_runes = append(re_runes, c)
 		}