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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/ScriptState.h"
     37 #include "bindings/v8/V8AbstractEventListener.h"
     38 #include "bindings/v8/V8Binding.h"
     39 #include "bindings/v8/V8WindowShell.h"
     40 #include "core/dom/Document.h"
     41 #include "core/dom/DocumentParser.h"
     42 #include "core/events/EventListener.h"
     43 #include "core/frame/Frame.h"
     44 
     45 namespace WebCore {
     46 
     47 static const AtomicString& eventParameterName(bool isSVGEvent)
     48 {
     49     DEFINE_STATIC_LOCAL(const AtomicString, eventString, ("event"));
     50     DEFINE_STATIC_LOCAL(const AtomicString, evtString, ("evt"));
     51     return isSVGEvent ? evtString : eventString;
     52 }
     53 
     54 PassRefPtr<V8LazyEventListener> createAttributeEventListener(Node* node, const QualifiedName& name, const AtomicString& value)
     55 {
     56     ASSERT(node);
     57     if (value.isNull())
     58         return 0;
     59 
     60     // FIXME: Very strange: we initialize zero-based number with '1'.
     61     TextPosition position(OrdinalNumber::fromZeroBasedInt(1), OrdinalNumber::first());
     62     String sourceURL;
     63 
     64     v8::Isolate* isolate;
     65     if (Frame* frame = node->document().frame()) {
     66         isolate = toIsolate(frame);
     67         ScriptController& scriptController = frame->script();
     68         if (!scriptController.canExecuteScripts(AboutToExecuteScript))
     69             return 0;
     70         position = scriptController.eventHandlerPosition();
     71         sourceURL = node->document().url().string();
     72     } else {
     73         isolate = v8::Isolate::GetCurrent();
     74     }
     75 
     76     return V8LazyEventListener::create(name.localName(), eventParameterName(node->isSVGElement()), value, sourceURL, position, node, isolate);
     77 }
     78 
     79 PassRefPtr<V8LazyEventListener> createAttributeEventListener(Frame* frame, const QualifiedName& name, const AtomicString& value)
     80 {
     81     if (!frame)
     82         return 0;
     83 
     84     if (value.isNull())
     85         return 0;
     86 
     87     ScriptController& scriptController = frame->script();
     88     if (!scriptController.canExecuteScripts(AboutToExecuteScript))
     89         return 0;
     90 
     91     TextPosition position = scriptController.eventHandlerPosition();
     92     String sourceURL = frame->document()->url().string();
     93 
     94     return V8LazyEventListener::create(name.localName(), eventParameterName(frame->document()->isSVGDocument()), value, sourceURL, position, 0, toIsolate(frame));
     95 }
     96 
     97 String eventListenerHandlerBody(Document* document, EventListener* listener)
     98 {
     99     if (listener->type() != EventListener::JSEventListenerType)
    100         return "";
    101 
    102     v8::HandleScope scope(toIsolate(document));
    103     V8AbstractEventListener* v8Listener = static_cast<V8AbstractEventListener*>(listener);
    104     v8::Handle<v8::Context> context = toV8Context(document, v8Listener->world());
    105     v8::Context::Scope contextScope(context);
    106     v8::Handle<v8::Value> function = v8Listener->getListenerObject(document);
    107     if (function.IsEmpty())
    108         return "";
    109 
    110     V8TRYCATCH_FOR_V8STRINGRESOURCE_RETURN(V8StringResource<WithNullCheck>, functionString, function, "");
    111     return functionString;
    112 }
    113 
    114 ScriptValue eventListenerHandler(Document* document, EventListener* listener)
    115 {
    116     if (listener->type() != EventListener::JSEventListenerType)
    117         return ScriptValue();
    118 
    119     v8::Isolate* isolate = toIsolate(document);
    120     v8::HandleScope scope(isolate);
    121     V8AbstractEventListener* v8Listener = static_cast<V8AbstractEventListener*>(listener);
    122     v8::Handle<v8::Context> context = toV8Context(document, v8Listener->world());
    123     v8::Context::Scope contextScope(context);
    124     v8::Handle<v8::Object> function = v8Listener->getListenerObject(document);
    125     if (function.IsEmpty())
    126         return ScriptValue();
    127     return ScriptValue(function, isolate);
    128 }
    129 
    130 ScriptState* eventListenerHandlerScriptState(Frame* frame, EventListener* listener)
    131 {
    132     if (listener->type() != EventListener::JSEventListenerType)
    133         return 0;
    134     V8AbstractEventListener* v8Listener = static_cast<V8AbstractEventListener*>(listener);
    135     v8::HandleScope scope(toIsolate(frame));
    136     v8::Handle<v8::Context> v8Context = frame->script().windowShell(v8Listener->world())->context();
    137     return ScriptState::forContext(v8Context);
    138 }
    139 
    140 bool eventListenerHandlerLocation(Document* document, EventListener* listener, String& sourceName, String& scriptId, int& lineNumber)
    141 {
    142     if (listener->type() != EventListener::JSEventListenerType)
    143         return false;
    144 
    145     v8::HandleScope scope(toIsolate(document));
    146     V8AbstractEventListener* v8Listener = static_cast<V8AbstractEventListener*>(listener);
    147     v8::Handle<v8::Context> context = toV8Context(document, v8Listener->world());
    148     v8::Context::Scope contextScope(context);
    149     v8::Handle<v8::Object> object = v8Listener->getListenerObject(document);
    150     if (object.IsEmpty() || !object->IsFunction())
    151         return false;
    152 
    153     v8::Handle<v8::Function> function = v8::Handle<v8::Function>::Cast(object);
    154     int scriptIdValue = function->ScriptId();
    155     scriptId = String::number(scriptIdValue);
    156     v8::ScriptOrigin origin = function->GetScriptOrigin();
    157     if (!origin.ResourceName().IsEmpty() && origin.ResourceName()->IsString())
    158         sourceName = toCoreString(origin.ResourceName().As<v8::String>());
    159     else
    160         sourceName = "";
    161     lineNumber = function->GetScriptLineNumber();
    162     return true;
    163 }
    164 
    165 } // namespace WebCore
    166