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      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