v8/test/mjsunit/regexp-results-cache.js

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// Copyright 2012 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.
// Long string to trigger caching.
var string =
"Friends, Romans, countrymen, lend me your ears! \
I come to bury Caesar, not to praise him. \
The evil that men do lives after them, \
The good is oft interred with their bones; \
So let it be with Caesar. The noble Brutus \
Hath told you Caesar was ambitious; \
If it were so, it was a grievous fault, \
And grievously hath Caesar answer'd it. \
Here, under leave of Brutus and the rest- \
For Brutus is an honorable man; \
So are they all, all honorable men- \
Come I to speak in Caesar's funeral. \
He was my friend, faithful and just to me; \
But Brutus says he was ambitious, \
And Brutus is an honorable man. \
He hath brought many captives home to Rome, \
Whose ransoms did the general coffers fill. \
Did this in Caesar seem ambitious? \
When that the poor have cried, Caesar hath wept; \
Ambition should be made of sterner stuff: \
Yet Brutus says he was ambitious, \
And Brutus is an honorable man. \
You all did see that on the Lupercal \
I thrice presented him a kingly crown, \
Which he did thrice refuse. Was this ambition? \
Yet Brutus says he was ambitious, \
And sure he is an honorable man. \
I speak not to disprove what Brutus spoke, \
But here I am to speak what I do know. \
You all did love him once, not without cause; \
What cause withholds you then to mourn for him? \
O judgement, thou art fled to brutish beasts, \
And men have lost their reason. Bear with me; \
My heart is in the coffin there with Caesar, \
And I must pause till it come back to me.";
var replaced = string.replace(/\b\w+\b/g, function() { return "foo"; });
for (var i = 0; i < 3; i++) {
assertEquals(replaced,
string.replace(/\b\w+\b/g, function() { return "foo"; }));
}
// Check that the result is in a COW array.
var words = string.split(" ");
assertEquals("Friends,", words[0]);
words[0] = "Enemies,";
words = string.split(" ");
assertEquals("Friends,", words[0]);