From 4852bef23de435fc6c303f2b7d48cba89d6e0a6e Mon Sep 17 00:00:00 2001
From: "lrn@chromium.org"
 <lrn@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Wed, 4 Mar 2009 09:52:01 +0000
Subject: [PATCH] Issue 246 - wait until regexp is parsed to detect whether
 it's simple.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1412 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/parser.cc                       |  9 ++++++---
 test/mjsunit/regress/regress-246.js | 31 +++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 3 deletions(-)
 create mode 100755 test/mjsunit/regress/regress-246.js

diff --git a/src/parser.cc b/src/parser.cc
index 713c6a8..115e181 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -3606,7 +3606,7 @@ RegExpParser::RegExpParser(FlatStringReader* in,
     next_pos_(0),
     in_(in),
     error_(error),
-    simple_(true),
+    simple_(false),
     contains_anchor_(false),
     captures_(NULL),
     is_scanned_for_captures_(false),
@@ -3676,6 +3676,11 @@ RegExpTree* RegExpParser::ParsePattern() {
   if (has_more()) {
     ReportError(CStrVector("Unmatched ')'") CHECK_FAILED);
   }
+  // If the result of parsing is a literal string atom, and it has the
+  // same length as the input, then the atom is identical to the input.
+  if (result->IsAtom() && result->AsAtom()->length() == in()->length()) {
+    simple_ = true;
+  }
   return result;
 }
 
@@ -3875,7 +3880,6 @@ RegExpTree* RegExpParser::ParseDisjunction() {
         Advance(2);
         break;
       }
-      simple_ = false;
       break;
     case '{': {
       int dummy;
@@ -3932,7 +3936,6 @@ RegExpTree* RegExpParser::ParseDisjunction() {
       is_greedy = false;
       Advance();
     }
-    simple_ = false;  // Adding quantifier might *remove* look-ahead.
     builder.AddQuantifierToAtom(min, max, is_greedy);
   }
 }
diff --git a/test/mjsunit/regress/regress-246.js b/test/mjsunit/regress/regress-246.js
new file mode 100755
index 0000000..4324b54
--- /dev/null
+++ b/test/mjsunit/regress/regress-246.js
@@ -0,0 +1,31 @@
+// Copyright 2008 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// See: http://code.google.com/p/v8/issues/detail?id=246
+
+assertTrue(/(?:text)/.test("text"));
+assertEquals(["text"], /(?:text)/.exec("text"));
\ No newline at end of file
-- 
2.7.4