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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "bindings/v8/ScriptPreprocessor.h"
     33 
     34 #include "bindings/v8/ScriptController.h"
     35 #include "bindings/v8/ScriptSourceCode.h"
     36 #include "bindings/v8/ScriptValue.h"
     37 #include "bindings/v8/V8ScriptRunner.h"
     38 #include "core/page/PageConsole.h"
     39 #include "wtf/TemporaryChange.h"
     40 
     41 namespace WebCore {
     42 
     43 ScriptPreprocessor::ScriptPreprocessor(const ScriptSourceCode& preprocessorSourceCode, ScriptController& controller, PageConsole& console)
     44     : m_isPreprocessing(false)
     45 {
     46     v8::TryCatch tryCatch;
     47     tryCatch.SetVerbose(true);
     48     Vector<ScriptSourceCode> sources;
     49     sources.append(preprocessorSourceCode);
     50     Vector<ScriptValue> scriptResults;
     51     controller.executeScriptInIsolatedWorld(ScriptPreprocessorIsolatedWorldId, sources, DOMWrapperWorld::mainWorldExtensionGroup, &scriptResults);
     52 
     53     if (scriptResults.size() != 1) {
     54         console.addMessage(JSMessageSource, ErrorMessageLevel, "ScriptPreprocessor internal error, one ScriptSourceCode must give exactly one result.");
     55         return;
     56     }
     57 
     58     ScriptValue preprocessorFunction = scriptResults[0];
     59     if (!preprocessorFunction.isFunction()) {
     60         console.addMessage(JSMessageSource, ErrorMessageLevel, "The preprocessor must compile to a function.");
     61         return;
     62     }
     63 
     64     m_world = DOMWrapperWorld::ensureIsolatedWorld(ScriptPreprocessorIsolatedWorldId, DOMWrapperWorld::mainWorldExtensionGroup);
     65     v8::Local<v8::Context> context = m_world->context(controller);
     66     m_isolate = context->GetIsolate();
     67 
     68     m_context.set(m_isolate, context);
     69     m_preprocessorFunction.set(m_isolate, v8::Handle<v8::Function>::Cast(preprocessorFunction.v8Value()));
     70 }
     71 
     72 String ScriptPreprocessor::preprocessSourceCode(const String& sourceCode, const String& sourceName)
     73 {
     74     if (!isValid())
     75         return sourceCode;
     76 
     77     return preprocessSourceCode(sourceCode, sourceName, v8::Undefined(m_isolate));
     78 }
     79 
     80 String ScriptPreprocessor::preprocessSourceCode(const String& sourceCode, const String& sourceName, const String& functionName)
     81 {
     82     if (!isValid())
     83         return sourceCode;
     84 
     85     v8::Handle<v8::String> functionNameString = v8String(m_isolate, functionName);
     86     return preprocessSourceCode(sourceCode, sourceName, functionNameString);
     87 }
     88 
     89 String ScriptPreprocessor::preprocessSourceCode(const String& sourceCode, const String& sourceName, v8::Handle<v8::Value> functionName)
     90 {
     91     if (!isValid())
     92         return sourceCode;
     93 
     94     v8::HandleScope handleScope(m_isolate);
     95     v8::Context::Scope contextScope(m_context.newLocal(m_isolate));
     96 
     97     v8::Handle<v8::String> sourceCodeString = v8String(m_isolate, sourceCode);
     98     v8::Handle<v8::String> sourceNameString = v8String(m_isolate, sourceName);
     99     v8::Handle<v8::Value> argv[] = { sourceCodeString, sourceNameString, functionName};
    100 
    101     v8::TryCatch tryCatch;
    102     tryCatch.SetVerbose(true);
    103     TemporaryChange<bool> isPreprocessing(m_isPreprocessing, true);
    104     v8::Handle<v8::Value> resultValue = V8ScriptRunner::callAsFunction(m_preprocessorFunction.newLocal(m_isolate), m_context.newLocal(m_isolate)->Global(), WTF_ARRAY_LENGTH(argv), argv);
    105 
    106     if (!resultValue.IsEmpty() && resultValue->IsString())
    107         return toCoreStringWithNullCheck(resultValue.As<v8::String>());
    108 
    109     return sourceCode;
    110 }
    111 
    112 } // namespace WebCore
    113