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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/core/v8/ScriptPreprocessor.h"
     33 
     34 #include "bindings/core/v8/ScriptController.h"
     35 #include "bindings/core/v8/ScriptSourceCode.h"
     36 #include "bindings/core/v8/ScriptValue.h"
     37 #include "bindings/core/v8/V8Binding.h"
     38 #include "bindings/core/v8/V8ScriptRunner.h"
     39 #include "core/frame/FrameConsole.h"
     40 #include "core/frame/FrameHost.h"
     41 #include "core/frame/LocalFrame.h"
     42 #include "core/inspector/ConsoleMessage.h"
     43 #include "wtf/TemporaryChange.h"
     44 
     45 namespace blink {
     46 
     47 ScriptPreprocessor::ScriptPreprocessor(const ScriptSourceCode& preprocessorSourceCode, LocalFrame* frame)
     48     : m_isPreprocessing(false)
     49 {
     50     RefPtr<DOMWrapperWorld> world = DOMWrapperWorld::ensureIsolatedWorld(ScriptPreprocessorIsolatedWorldId, DOMWrapperWorld::mainWorldExtensionGroup);
     51     m_scriptState = ScriptState::from(toV8Context(frame, *world));
     52 
     53     v8::HandleScope handleScope(m_scriptState->isolate());
     54     ASSERT(frame);
     55     v8::TryCatch tryCatch;
     56     tryCatch.SetVerbose(true);
     57     Vector<ScriptSourceCode> sources;
     58     sources.append(preprocessorSourceCode);
     59     Vector<v8::Local<v8::Value> > scriptResults;
     60     frame->script().executeScriptInIsolatedWorld(ScriptPreprocessorIsolatedWorldId, sources, DOMWrapperWorld::mainWorldExtensionGroup, &scriptResults);
     61 
     62     if (scriptResults.size() != 1) {
     63         frame->console().addMessage(ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, "ScriptPreprocessor internal error, one ScriptSourceCode must give exactly one result."));
     64         return;
     65     }
     66 
     67     v8::Local<v8::Value> preprocessorFunction = scriptResults[0];
     68     if (preprocessorFunction.IsEmpty() || !preprocessorFunction->IsFunction()) {
     69         frame->console().addMessage(ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, "The preprocessor must compile to a function."));
     70         return;
     71     }
     72     m_preprocessorFunction.set(m_scriptState->isolate(), v8::Handle<v8::Function>::Cast(preprocessorFunction));
     73 }
     74 
     75 String ScriptPreprocessor::preprocessSourceCode(const String& sourceCode, const String& sourceName)
     76 {
     77     if (!isValid())
     78         return sourceCode;
     79 
     80     return preprocessSourceCode(sourceCode, sourceName, v8::Undefined(m_scriptState->isolate()));
     81 }
     82 
     83 String ScriptPreprocessor::preprocessSourceCode(const String& sourceCode, const String& sourceName, const String& functionName)
     84 {
     85     if (!isValid())
     86         return sourceCode;
     87 
     88     v8::Handle<v8::String> functionNameString = v8String(m_scriptState->isolate(), functionName);
     89     return preprocessSourceCode(sourceCode, sourceName, functionNameString);
     90 }
     91 
     92 String ScriptPreprocessor::preprocessSourceCode(const String& sourceCode, const String& sourceName, v8::Handle<v8::Value> functionName)
     93 {
     94     if (!isValid())
     95         return sourceCode;
     96 
     97     v8::Isolate* isolate = m_scriptState->isolate();
     98     ScriptState::Scope scope(m_scriptState.get());
     99 
    100     v8::Handle<v8::String> sourceCodeString = v8String(isolate, sourceCode);
    101     v8::Handle<v8::String> sourceNameString = v8String(isolate, sourceName);
    102     v8::Handle<v8::Value> argv[] = { sourceCodeString, sourceNameString, functionName};
    103 
    104     v8::TryCatch tryCatch;
    105     tryCatch.SetVerbose(true);
    106     TemporaryChange<bool> isPreprocessing(m_isPreprocessing, true);
    107     v8::Handle<v8::Value> resultValue = V8ScriptRunner::callAsFunction(isolate, m_preprocessorFunction.newLocal(isolate), m_scriptState->context()->Global(), WTF_ARRAY_LENGTH(argv), argv);
    108 
    109     if (!resultValue.IsEmpty() && resultValue->IsString())
    110         return toCoreStringWithNullCheck(resultValue.As<v8::String>());
    111 
    112     return sourceCode;
    113 }
    114 
    115 } // namespace blink
    116