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      1 /*
      2  * Copyright (C) 2009 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/ScriptEventListener.h"
     33 
     34 #include "bindings/v8/ScriptController.h"
     35 #include "bindings/v8/ScriptScope.h"
     36 #include "bindings/v8/V8AbstractEventListener.h"
     37 #include "bindings/v8/V8Binding.h"
     38 #include "bindings/v8/V8WindowShell.h"
     39 #include "core/dom/Document.h"
     40 #include "core/dom/DocumentParser.h"
     41 #include "core/dom/EventListener.h"
     42 #include "core/page/Frame.h"
     43 
     44 namespace WebCore {
     45 
     46 static const String& eventParameterName(bool isSVGEvent)
     47 {
     48     DEFINE_STATIC_LOCAL(const String, eventString, ("event"));
     49     DEFINE_STATIC_LOCAL(const String, evtString, ("evt"));
     50     return isSVGEvent ? evtString : eventString;
     51 }
     52 
     53 PassRefPtr<V8LazyEventListener> createAttributeEventListener(Node* node, const QualifiedName& name, const AtomicString& value)
     54 {
     55     ASSERT(node);
     56     if (value.isNull())
     57         return 0;
     58 
     59     // FIXME: Very strange: we initialize zero-based number with '1'.
     60     TextPosition position(OrdinalNumber::fromZeroBasedInt(1), OrdinalNumber::first());
     61     String sourceURL;
     62 
     63     if (Frame* frame = node->document()->frame()) {
     64         ScriptController* scriptController = frame->script();
     65         if (!scriptController->canExecuteScripts(AboutToExecuteScript))
     66             return 0;
     67         position = scriptController->eventHandlerPosition();
     68         sourceURL = node->document()->url().string();
     69     }
     70 
     71     return V8LazyEventListener::create(name.localName().string(), eventParameterName(node->isSVGElement()), value, sourceURL, position, node);
     72 }
     73 
     74 PassRefPtr<V8LazyEventListener> createAttributeEventListener(Frame* frame, const QualifiedName& name, const AtomicString& value)
     75 {
     76     if (!frame)
     77         return 0;
     78 
     79     if (value.isNull())
     80         return 0;
     81 
     82     ScriptController* scriptController = frame->script();
     83     if (!scriptController->canExecuteScripts(AboutToExecuteScript))
     84         return 0;
     85 
     86     TextPosition position = scriptController->eventHandlerPosition();
     87     String sourceURL = frame->document()->url().string();
     88 
     89     return V8LazyEventListener::create(name.localName().string(), eventParameterName(frame->document()->isSVGDocument()), value, sourceURL, position, 0);
     90 }
     91 
     92 String eventListenerHandlerBody(Document* document, EventListener* listener)
     93 {
     94     if (listener->type() != EventListener::JSEventListenerType)
     95         return "";
     96 
     97     v8::HandleScope scope;
     98     V8AbstractEventListener* v8Listener = static_cast<V8AbstractEventListener*>(listener);
     99     v8::Handle<v8::Context> context = toV8Context(document, v8Listener->world());
    100     v8::Context::Scope contextScope(context);
    101     v8::Handle<v8::Object> function = v8Listener->getListenerObject(document);
    102     if (function.IsEmpty())
    103         return "";
    104 
    105     return toWebCoreStringWithNullCheck(function);
    106 }
    107 
    108 ScriptValue eventListenerHandler(Document* document, EventListener* listener)
    109 {
    110     if (listener->type() != EventListener::JSEventListenerType)
    111         return ScriptValue();
    112 
    113     v8::HandleScope scope;
    114     V8AbstractEventListener* v8Listener = static_cast<V8AbstractEventListener*>(listener);
    115     v8::Handle<v8::Context> context = toV8Context(document, v8Listener->world());
    116     v8::Context::Scope contextScope(context);
    117     v8::Handle<v8::Object> function = v8Listener->getListenerObject(document);
    118     if (function.IsEmpty())
    119         return ScriptValue();
    120     return ScriptValue(function);
    121 }
    122 
    123 ScriptState* eventListenerHandlerScriptState(Frame* frame, EventListener* listener)
    124 {
    125     if (listener->type() != EventListener::JSEventListenerType)
    126         return 0;
    127     V8AbstractEventListener* v8Listener = static_cast<V8AbstractEventListener*>(listener);
    128     v8::HandleScope scope;
    129     v8::Handle<v8::Context> v8Context = frame->script()->windowShell(v8Listener->world())->context();
    130     return ScriptState::forContext(v8Context);
    131 }
    132 
    133 bool eventListenerHandlerLocation(Document* document, EventListener* listener, String& sourceName, String& scriptId, int& lineNumber)
    134 {
    135     if (listener->type() != EventListener::JSEventListenerType)
    136         return false;
    137 
    138     v8::HandleScope scope;
    139     V8AbstractEventListener* v8Listener = static_cast<V8AbstractEventListener*>(listener);
    140     v8::Handle<v8::Context> context = toV8Context(document, v8Listener->world());
    141     v8::Context::Scope contextScope(context);
    142     v8::Handle<v8::Object> object = v8Listener->getListenerObject(document);
    143     if (object.IsEmpty() || !object->IsFunction())
    144         return false;
    145 
    146     v8::Handle<v8::Function> function = v8::Handle<v8::Function>::Cast(object);
    147     v8::Handle<v8::Value> scriptIdValue = function->GetScriptId();
    148     scriptId = toWebCoreStringWithUndefinedOrNullCheck(scriptIdValue);
    149     v8::ScriptOrigin origin = function->GetScriptOrigin();
    150     if (origin.ResourceName()->IsString() && !origin.ResourceName().IsEmpty())
    151         sourceName = toWebCoreString(origin.ResourceName());
    152     else
    153         sourceName = "";
    154     lineNumber = function->GetScriptLineNumber();
    155     return true;
    156 }
    157 
    158 } // namespace WebCore
    159