Correct issue 696 with Date.parse returning a value when called on a non date string.

The error was introduced in revision 4557 where support was added for
ES5 date time format strings. Because there was no check for a valid
year a random string starting with a non-digit character would be
parsed.

This change disallows ES5 formatted dates where there is no date
fraction (i.e., with only a timestamp). Since none of the other
browsers support Date.parse on only timestamps I have disabled this
totally instead of just correcting the parser.


Review URL: http://codereview.chromium.org/2017005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4613 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/dateparser.cc

@@ -33,22 +33,17 @@ namespace v8 {
 namespace internal {
 
 bool DateParser::DayComposer::Write(FixedArray* output) {
-  // Set year to 0 by default.
-  if (index_ < 1) {
-    comp_[index_++] = 1;
-  }
-
-  // Day and month defaults to 1.
-  while (index_ < kSize) {
-      comp_[index_++] = 1;
-  }
+    if (index_ < 1) return false;
+   // Day and month defaults to 1.
+   while (index_ < kSize) {
+       comp_[index_++] = 1;
+   }
 
   int year = 0;  // Default year is 0 (=> 2000) for KJS compatibility.
   int month = kNone;
   int day = kNone;
 
   if (named_month_ == kNone) {
-    if (index_ < 2) return false;
     if (index_ == 3 && !IsDay(comp_[0])) {
       // YMD
       year = comp_[0];
@@ -62,7 +57,6 @@ bool DateParser::DayComposer::Write(FixedArray* output) {
     }
   } else {
     month = named_month_;
-    if (index_ < 1) return false;
     if (index_ == 1) {
       // MD or DM
       day = comp_[0];

test/mjsunit/regress/regress-696.js

+// Copyright 2010 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=696
+// Because of the change in dateparser in revision 4557 to support time
+// only strings in Date.parse we also misleadingly supported strings with non
+// leading numbers. 
+
+assertTrue(isNaN(Date.parse('x')));
+assertTrue(isNaN(Date.parse('1x')));
+assertTrue(isNaN(Date.parse('xT10:00:00')));
+assertTrue(isNaN(Date.parse('This is a relatively long string')));