Migrate more tests from blink repository.

test/webkit/fast/regex/toString.js

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1.  Redistributions of source code must retain the above copyright
+//     notice, this list of conditions and the following disclaimer.
+// 2.  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.
+//
+// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
+
+description("This page tests toString conversion of RegExp objects, particularly wrt to '/' characters and RegExp.prototype.");
+
+function testForwardSlash(pattern, _string)
+{
+    string = _string;
+
+    re1 = new RegExp(pattern);
+    re2 = eval(re1.toString());
+
+    return re1.test(string) && re2.test(string);
+}
+
+function testLineTerminator(pattern)
+{
+    re1 = new RegExp(pattern);
+
+    return /\n|\r|\u2028|\u2029/.test(re1.toString());
+}
+
+shouldBe("RegExp('/').source", '"\\\\/"');
+shouldBe("RegExp('').source", '"(?:)"');
+shouldBe("RegExp.prototype.source", '"(?:)"');
+
+shouldBe("RegExp('/').toString()", '"/\\\\//"');
+shouldBe("RegExp('').toString()", '"/(?:)/"');
+shouldBe("RegExp.prototype.toString()", '"/(?:)/"');
+
+// These strings are equivalent, since the '\' is identity escaping the '/' at the string level.
+shouldBeTrue('testForwardSlash("^/$", "/");');
+shouldBeTrue('testForwardSlash("^\/$", "/");');
+// This string passes "^\/$" to the RegExp, so the '/' is escaped in the re!
+shouldBeTrue('testForwardSlash("^\\/$", "/");');
+// These strings pass "^\\/$" and "^\\\/$" respectively to the RegExp, giving one '\' to match.
+shouldBeTrue('testForwardSlash("^\\\\/$", "\\/");');
+shouldBeTrue('testForwardSlash("^\\\\\\/$", "\\/");');
+// These strings match two backslashes (the second with the '/' escaped).
+shouldBeTrue('testForwardSlash("^\\\\\\\\/$", "\\\\/");');
+shouldBeTrue('testForwardSlash("^\\\\\\\\\\/$", "\\\\/");');
+// Test that nothing goes wrongif there are multiple forward slashes!
+shouldBeTrue('testForwardSlash("x/x/x", "x\\/x\\/x");');
+shouldBeTrue('testForwardSlash("x\\/x/x", "x\\/x\\/x");');
+shouldBeTrue('testForwardSlash("x/x\\/x", "x\\/x\\/x");');
+shouldBeTrue('testForwardSlash("x\\/x\\/x", "x\\/x\\/x");');
+
+shouldBeFalse('testLineTerminator("\\n");');
+shouldBeFalse('testLineTerminator("\\\\n");');
+shouldBeFalse('testLineTerminator("\\r");');
+shouldBeFalse('testLineTerminator("\\\\r");');
+shouldBeFalse('testLineTerminator("\\u2028");');
+shouldBeFalse('testLineTerminator("\\\\u2028");');
+shouldBeFalse('testLineTerminator("\\u2029");');
+shouldBeFalse('testLineTerminator("\\\\u2029");');
+
+shouldBe("RegExp('[/]').source", "'[/]'");
+shouldBe("RegExp('\\\\[/]').source", "'\\\\[\\\\/]'");
+
+// See 15.10.6.4
+// The first half of this checks that:
+//     Return the String value formed by concatenating the Strings "/", the
+//     String value of the source property of this RegExp object, and "/";
+// The second half checks that:
+//     The returned String has the form of a RegularExpressionLiteral that
+//     evaluates to another RegExp object with the same behaviour as this object.
+shouldBe("var o = new RegExp(); o.toString() === '/'+o.source+'/' && eval(o.toString()+'.exec(String())')", '[""]');