From 3426d318446dece541fe99bed24d9d0fd155f404 Mon Sep 17 00:00:00 2001
From: Oleg Sukhodolsky <oleg.sukhodolsky@jetbrains.com>
Date: Sat, 9 Feb 2013 17:03:57 +0400
Subject: [PATCH] RUBY-12161: special case to parse valid octal chars
 #RUBY-12161 fixed

---
 .../lang/regexp/psi/impl/RegExpCharImpl.java   | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/RegExpSupport/src/org/intellij/lang/regexp/psi/impl/RegExpCharImpl.java b/RegExpSupport/src/org/intellij/lang/regexp/psi/impl/RegExpCharImpl.java
index ccff8a4a0e12..5ebee1d74d22 100644
--- a/RegExpSupport/src/org/intellij/lang/regexp/psi/impl/RegExpCharImpl.java
+++ b/RegExpSupport/src/org/intellij/lang/regexp/psi/impl/RegExpCharImpl.java
@@ -57,7 +57,23 @@ public class RegExpCharImpl extends RegExpElementImpl implements RegExpChar {
     @Nullable
     public Character getValue() {
       final String s = getUnescapedText();
-      if (s.equals("\\") && getType() == Type.CHAR) return '\\';
+      if (s.equals("\\") && getType() == Type.CHAR) {
+        return '\\';
+      }
+      // special case for valid octal escaped sequences (see RUBY-12161)
+      if (s.startsWith("\\") && s.length() > 1) {
+        final ASTNode child = getNode().getFirstChildNode();
+        assert child != null;
+        final IElementType t = child.getElementType();
+        if (t == RegExpTT.OCT_CHAR) {
+          try {
+            return (char) Integer.parseInt(s.substring(1), 8);
+          }
+          catch (NumberFormatException e) {
+            // do nothing
+          }
+        }
+      }
       return unescapeChar(s);
     }