1 /* 2 * Copyright (C) 2004, 2008, 2009 Apple Inc. All rights reserved. 3 * Copyright (C) 2008 Collabora Ltd. 4 * Copyright (C) 2011 Peter Varga (pvarga (at) webkit.org), University of Szeged 5 * Copyright (C) 2013 Google Inc. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 20 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 24 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "config.h" 30 #include "bindings/core/v8/ScriptRegexp.h" 31 32 #include "bindings/core/v8/V8Binding.h" 33 #include "bindings/core/v8/V8PerIsolateData.h" 34 #include "bindings/core/v8/V8ScriptRunner.h" 35 #include "platform/ScriptForbiddenScope.h" 36 37 namespace blink { 38 39 ScriptRegexp::ScriptRegexp(const String& pattern, TextCaseSensitivity caseSensitivity, MultilineMode multilineMode) 40 { 41 v8::Isolate* isolate = v8::Isolate::GetCurrent(); 42 v8::HandleScope handleScope(isolate); 43 v8::Context::Scope contextScope(V8PerIsolateData::from(isolate)->ensureScriptRegexpContext()); 44 v8::TryCatch tryCatch; 45 46 unsigned flags = v8::RegExp::kNone; 47 if (caseSensitivity == TextCaseInsensitive) 48 flags |= v8::RegExp::kIgnoreCase; 49 if (multilineMode == MultilineEnabled) 50 flags |= v8::RegExp::kMultiline; 51 52 v8::Local<v8::RegExp> regex = v8::RegExp::New(v8String(isolate, pattern), static_cast<v8::RegExp::Flags>(flags)); 53 54 // If the regex failed to compile we'll get an empty handle. 55 if (!regex.IsEmpty()) 56 m_regex.set(isolate, regex); 57 } 58 59 int ScriptRegexp::match(const String& string, int startFrom, int* matchLength) const 60 { 61 if (matchLength) 62 *matchLength = 0; 63 64 if (m_regex.isEmpty() || string.isNull()) 65 return -1; 66 67 // v8 strings are limited to int. 68 if (string.length() > INT_MAX) 69 return -1; 70 71 ScriptForbiddenScope::AllowUserAgentScript allowScript; 72 73 v8::Isolate* isolate = v8::Isolate::GetCurrent(); 74 v8::HandleScope handleScope(isolate); 75 v8::Context::Scope contextScope(V8PerIsolateData::from(isolate)->ensureScriptRegexpContext()); 76 v8::TryCatch tryCatch; 77 78 v8::Local<v8::RegExp> regex = m_regex.newLocal(isolate); 79 v8::Local<v8::Function> exec = regex->Get(v8AtomicString(isolate, "exec")).As<v8::Function>(); 80 v8::Handle<v8::Value> argv[] = { v8String(isolate, string.substring(startFrom)) }; 81 v8::Local<v8::Value> returnValue = V8ScriptRunner::callInternalFunction(exec, regex, WTF_ARRAY_LENGTH(argv), argv, isolate); 82 83 if (tryCatch.HasCaught()) 84 return -1; 85 86 // RegExp#exec returns null if there's no match, otherwise it returns an 87 // Array of strings with the first being the whole match string and others 88 // being subgroups. The Array also has some random properties tacked on like 89 // "index" which is the offset of the match. 90 // 91 // https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/RegExp/exec 92 93 ASSERT(!returnValue.IsEmpty()); 94 if (!returnValue->IsArray()) 95 return -1; 96 97 v8::Local<v8::Array> result = returnValue.As<v8::Array>(); 98 int matchOffset = result->Get(v8AtomicString(isolate, "index"))->ToInt32()->Value(); 99 if (matchLength) { 100 v8::Local<v8::String> match = result->Get(0).As<v8::String>(); 101 *matchLength = match->Length(); 102 } 103 104 return matchOffset + startFrom; 105 } 106 107 } // namespace blink 108