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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/V8Binding.h"
     38 #include "bindings/v8/V8ScriptRunner.h"
     39 #include "core/frame/FrameConsole.h"
     40 #include "core/frame/FrameHost.h"
     41 #include "core/frame/LocalFrame.h"
     42 #include "wtf/TemporaryChange.h"
     43 
     44 namespace WebCore {
     45 
     46 ScriptPreprocessor::ScriptPreprocessor(const ScriptSourceCode& preprocessorSourceCode, LocalFrame* frame)
     47     : m_isPreprocessing(false)
     48 {
     49     RefPtr<DOMWrapperWorld> world = DOMWrapperWorld::ensureIsolatedWorld(ScriptPreprocessorIsolatedWorldId, DOMWrapperWorld::mainWorldExtensionGroup);
     50     m_scriptState = ScriptState::from(toV8Context(frame, *world));
     51 
     52     v8::HandleScope handleScope(m_scriptState->isolate());
     53     ASSERT(frame);
     54     v8::TryCatch tryCatch;
     55     tryCatch.SetVerbose(true);
     56     Vector<ScriptSourceCode> sources;
     57     sources.append(preprocessorSourceCode);
     58     Vector<v8::Local<v8::Value> > scriptResults;
     59     frame->script().executeScriptInIsolatedWorld(ScriptPreprocessorIsolatedWorldId, sources, DOMWrapperWorld::mainWorldExtensionGroup, &scriptResults);
     60 
     61     if (scriptResults.size() != 1) {
     62         frame->console().addMessage(JSMessageSource, ErrorMessageLevel, "ScriptPreprocessor internal error, one ScriptSourceCode must give exactly one result.");
     63         return;
     64     }
     65 
     66     v8::Local<v8::Value> preprocessorFunction = scriptResults[0];
     67     if (preprocessorFunction.IsEmpty() || !preprocessorFunction->IsFunction()) {
     68         frame->console().addMessage(JSMessageSource, ErrorMessageLevel, "The preprocessor must compile to a function.");
     69         return;
     70     }
     71     m_preprocessorFunction.set(m_scriptState->isolate(), v8::Handle<v8::Function>::Cast(preprocessorFunction));
     72 }
     73 
     74 String ScriptPreprocessor::preprocessSourceCode(const String& sourceCode, const String& sourceName)
     75 {
     76     if (!isValid())
     77         return sourceCode;
     78 
     79     return preprocessSourceCode(sourceCode, sourceName, v8::Undefined(m_scriptState->isolate()));
     80 }
     81 
     82 String ScriptPreprocessor::preprocessSourceCode(const String& sourceCode, const String& sourceName, const String& functionName)
     83 {
     84     if (!isValid())
     85         return sourceCode;
     86 
     87     v8::Handle<v8::String> functionNameString = v8String(m_scriptState->isolate(), functionName);
     88     return preprocessSourceCode(sourceCode, sourceName, functionNameString);
     89 }
     90 
     91 String ScriptPreprocessor::preprocessSourceCode(const String& sourceCode, const String& sourceName, v8::Handle<v8::Value> functionName)
     92 {
     93     if (!isValid())
     94         return sourceCode;
     95 
     96     v8::Isolate* isolate = m_scriptState->isolate();
     97     ScriptState::Scope scope(m_scriptState.get());
     98 
     99     v8::Handle<v8::String> sourceCodeString = v8String(isolate, sourceCode);
    100     v8::Handle<v8::String> sourceNameString = v8String(isolate, sourceName);
    101     v8::Handle<v8::Value> argv[] = { sourceCodeString, sourceNameString, functionName};
    102 
    103     v8::TryCatch tryCatch;
    104     tryCatch.SetVerbose(true);
    105     TemporaryChange<bool> isPreprocessing(m_isPreprocessing, true);
    106     v8::Handle<v8::Value> resultValue = V8ScriptRunner::callAsFunction(isolate, m_preprocessorFunction.newLocal(isolate), m_scriptState->context()->Global(), WTF_ARRAY_LENGTH(argv), argv);
    107 
    108     if (!resultValue.IsEmpty() && resultValue->IsString())
    109         return toCoreStringWithNullCheck(resultValue.As<v8::String>());
    110 
    111     return sourceCode;
    112 }
    113 
    114 } // namespace WebCore
    115