accessibilityuielement.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2008, 2009 Apple Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "AccessibilityUIElement.h"

#include <JavaScriptCore/JSRetainPtr.h>

// Static Functions

static AccessibilityUIElement* toAXElement(JSObjectRef object)
{
    // FIXME: We should ASSERT that it is the right class here.
    return reinterpret_cast<AccessibilityUIElement*>(JSObjectGetPrivate(object));
}

static JSValueRef allAttributesCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSRetainPtr<JSStringRef> attributes(Adopt, toAXElement(thisObject)->allAttributes());
    return JSValueMakeString(context, attributes.get());
}

static JSValueRef attributesOfLinkedUIElementsCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSRetainPtr<JSStringRef> linkedUIDescription(Adopt, toAXElement(thisObject)->attributesOfLinkedUIElements());
    return JSValueMakeString(context, linkedUIDescription.get());
}

static JSValueRef attributesOfDocumentLinksCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSRetainPtr<JSStringRef> linkedUIDescription(Adopt, toAXElement(thisObject)->attributesOfDocumentLinks());
    return JSValueMakeString(context, linkedUIDescription.get());
}

static JSValueRef attributesOfChildrenCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSRetainPtr<JSStringRef> childrenDescription(Adopt, toAXElement(thisObject)->attributesOfChildren());
    return JSValueMakeString(context, childrenDescription.get());
}

static JSValueRef parameterizedAttributeNamesCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSRetainPtr<JSStringRef> parameterizedAttributeNames(Adopt, toAXElement(thisObject)->parameterizedAttributeNames());
    return JSValueMakeString(context, parameterizedAttributeNames.get());
}

static JSValueRef attributesOfColumnHeadersCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSRetainPtr<JSStringRef> attributesOfColumnHeaders(Adopt, toAXElement(thisObject)->attributesOfColumnHeaders());
    return JSValueMakeString(context, attributesOfColumnHeaders.get());
}

static JSValueRef attributesOfRowHeadersCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSRetainPtr<JSStringRef> attributesOfRowHeaders(Adopt, toAXElement(thisObject)->attributesOfRowHeaders());
    return JSValueMakeString(context, attributesOfRowHeaders.get());
}

static JSValueRef attributesOfColumnsCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSRetainPtr<JSStringRef> attributesOfColumns(Adopt, toAXElement(thisObject)->attributesOfColumns());
    return JSValueMakeString(context, attributesOfColumns.get());
}

static JSValueRef attributesOfRowsCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSRetainPtr<JSStringRef> attributesOfRows(Adopt, toAXElement(thisObject)->attributesOfRows());
    return JSValueMakeString(context, attributesOfRows.get());
}

static JSValueRef attributesOfVisibleCellsCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSRetainPtr<JSStringRef> attributesOfVisibleCells(Adopt, toAXElement(thisObject)->attributesOfVisibleCells());
    return JSValueMakeString(context, attributesOfVisibleCells.get());
}

static JSValueRef attributesOfHeaderCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSRetainPtr<JSStringRef> attributesOfHeader(Adopt, toAXElement(thisObject)->attributesOfHeader());
    return JSValueMakeString(context, attributesOfHeader.get());
}

static JSValueRef indexInTableCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    return JSValueMakeNumber(context, toAXElement(thisObject)->indexInTable());
}

static JSValueRef rowIndexRangeCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSRetainPtr<JSStringRef> rowIndexRange(Adopt, toAXElement(thisObject)->rowIndexRange());
    return JSValueMakeString(context, rowIndexRange.get());
}

static JSValueRef columnIndexRangeCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSRetainPtr<JSStringRef> columnIndexRange(Adopt, toAXElement(thisObject)->columnIndexRange());
    return JSValueMakeString(context, columnIndexRange.get());
}

static JSValueRef lineForIndexCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    int indexNumber = -1;
    if (argumentCount == 1)
        indexNumber = JSValueToNumber(context, arguments[0], exception);
    
    return JSValueMakeNumber(context, toAXElement(thisObject)->lineForIndex(indexNumber));
}

static JSValueRef boundsForRangeCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    unsigned location = UINT_MAX, length = 0;
    if (argumentCount == 2) {
        location = JSValueToNumber(context, arguments[0], exception);
        length = JSValueToNumber(context, arguments[1], exception);
    }

    JSRetainPtr<JSStringRef> boundsDescription(Adopt, toAXElement(thisObject)->boundsForRange(location, length));
    return JSValueMakeString(context, boundsDescription.get());    
}

static JSValueRef childAtIndexCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    int indexNumber = -1;
    if (argumentCount == 1)
        indexNumber = JSValueToNumber(context, arguments[0], exception);
    
    return AccessibilityUIElement::makeJSAccessibilityUIElement(context, toAXElement(thisObject)->getChildAtIndex(indexNumber));
}

static JSValueRef isAttributeSettableCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSStringRef attribute = NULL;
    if (argumentCount == 1)
        attribute = JSValueToStringCopy(context, arguments[0], exception);    
    JSValueRef result = JSValueMakeNumber(context, toAXElement(thisObject)->isAttributeSettable(attribute));
    if (attribute)
        JSStringRelease(attribute);
    return result;
}

static JSValueRef attributeValueCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSStringRef attribute = NULL;
    if (argumentCount == 1)
        attribute = JSValueToStringCopy(context, arguments[0], exception);