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1/*
2 * Copyright (C) 2006, 2007, 2008, 2010 Apple 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
6 * are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#import "WebElementDictionary.h"
30
31#import "DOMNodeInternal.h"
32#import "WebDOMOperations.h"
33#import "WebFrame.h"
34#import "WebFrameInternal.h"
35#import "WebKitLogging.h"
36#import "WebTypesInternal.h"
37#import "WebView.h"
38#import "WebViewPrivate.h"
39#import <WebCore/Frame.h>
40#import <WebCore/HitTestResult.h>
41#import <WebCore/Image.h>
42#import <WebCore/WebCoreObjCExtras.h>
43#import <WebKit/DOMCore.h>
44#import <WebKit/DOMExtensions.h>
45#import <runtime/InitializeThreading.h>
46
47using namespace WebCore;
48
49static CFMutableDictionaryRef lookupTable = NULL;
50
51static void addLookupKey(NSString *key, SEL selector)
52{
53    CFDictionaryAddValue(lookupTable, key, selector);
54}
55
56static void cacheValueForKey(const void *key, const void *value, void *self)
57{
58    // calling objectForKey will cache the value in our _cache dictionary
59    [(WebElementDictionary *)self objectForKey:(NSString *)key];
60}
61
62@implementation WebElementDictionary
63
64+ (void)initialize
65{
66    JSC::initializeThreading();
67#ifndef BUILDING_ON_TIGER
68    WebCoreObjCFinalizeOnMainThread(self);
69#endif
70}
71
72+ (void)initializeLookupTable
73{
74    if (lookupTable)
75        return;
76
77    lookupTable = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &kCFCopyStringDictionaryKeyCallBacks, NULL);
78
79    addLookupKey(WebElementDOMNodeKey, @selector(_domNode));
80    addLookupKey(WebElementFrameKey, @selector(_webFrame));
81    addLookupKey(WebElementImageAltStringKey, @selector(_altDisplayString));
82    addLookupKey(WebElementImageKey, @selector(_image));
83    addLookupKey(WebElementImageRectKey, @selector(_imageRect));
84    addLookupKey(WebElementImageURLKey, @selector(_absoluteImageURL));
85    addLookupKey(WebElementIsSelectedKey, @selector(_isSelected));
86    addLookupKey(WebElementSpellingToolTipKey, @selector(_spellingToolTip));
87    addLookupKey(WebElementTitleKey, @selector(_title));
88    addLookupKey(WebElementLinkURLKey, @selector(_absoluteLinkURL));
89    addLookupKey(WebElementLinkTargetFrameKey, @selector(_targetWebFrame));
90    addLookupKey(WebElementLinkTitleKey, @selector(_titleDisplayString));
91    addLookupKey(WebElementLinkLabelKey, @selector(_textContent));
92    addLookupKey(WebElementLinkIsLiveKey, @selector(_isLiveLink));
93    addLookupKey(WebElementIsContentEditableKey, @selector(_isContentEditable));
94    addLookupKey(WebElementIsInScrollBarKey, @selector(_isInScrollBar));
95}
96
97- (id)initWithHitTestResult:(const HitTestResult&)result
98{
99    [[self class] initializeLookupTable];
100    [super init];
101    _result = new HitTestResult(result);
102    return self;
103}
104
105- (void)dealloc
106{
107    if (WebCoreObjCScheduleDeallocateOnMainThread([WebElementDictionary class], self))
108        return;
109
110    delete _result;
111    [_cache release];
112    [_nilValues release];
113    [super dealloc];
114}
115
116- (void)finalize
117{
118    ASSERT_MAIN_THREAD();
119    delete _result;
120    [super finalize];
121}
122
123- (void)_fillCache
124{
125    CFDictionaryApplyFunction(lookupTable, cacheValueForKey, self);
126    _cacheComplete = YES;
127}
128
129- (NSUInteger)count
130{
131    if (!_cacheComplete)
132        [self _fillCache];
133    return [_cache count];
134}
135
136- (NSEnumerator *)keyEnumerator
137{
138    if (!_cacheComplete)
139        [self _fillCache];
140    return [_cache keyEnumerator];
141}
142
143- (id)objectForKey:(id)key
144{
145    id value = [_cache objectForKey:key];
146    if (value || _cacheComplete || [_nilValues containsObject:key])
147        return value;
148
149    SEL selector = (SEL)CFDictionaryGetValue(lookupTable, key);
150    if (!selector)
151        return nil;
152    value = [self performSelector:selector];
153
154    unsigned lookupTableCount = CFDictionaryGetCount(lookupTable);
155    if (value) {
156        if (!_cache)
157            _cache = [[NSMutableDictionary alloc] initWithCapacity:lookupTableCount];
158        [_cache setObject:value forKey:key];
159    } else {
160        if (!_nilValues)
161            _nilValues = [[NSMutableSet alloc] initWithCapacity:lookupTableCount];
162        [_nilValues addObject:key];
163    }
164
165    _cacheComplete = ([_cache count] + [_nilValues count]) == lookupTableCount;
166
167    return value;
168}
169
170- (DOMNode *)_domNode
171{
172    return kit(_result->innerNonSharedNode());
173}
174
175- (WebFrame *)_webFrame
176{
177    return [[[self _domNode] ownerDocument] webFrame];
178}
179
180// String's NSString* operator converts null Strings to empty NSStrings for compatibility
181// with AppKit. We need to work around that here.
182static NSString* NSStringOrNil(String coreString)
183{
184    if (coreString.isNull())
185        return nil;
186    return coreString;
187}
188
189- (NSString *)_altDisplayString
190{
191    return NSStringOrNil(_result->altDisplayString());
192}
193
194- (NSString *)_spellingToolTip
195{
196    TextDirection dir;
197    return NSStringOrNil(_result->spellingToolTip(dir));
198}
199
200- (NSImage *)_image
201{
202    Image* image = _result->image();
203    return image ? image->getNSImage() : nil;
204}
205
206- (NSValue *)_imageRect
207{
208    IntRect rect = _result->imageRect();
209    return rect.isEmpty() ? nil : [NSValue valueWithRect:rect];
210}
211
212- (NSURL *)_absoluteImageURL
213{
214    return _result->absoluteImageURL();
215}
216
217- (NSNumber *)_isSelected
218{
219    return [NSNumber numberWithBool:_result->isSelected()];
220}
221
222- (NSString *)_title
223{
224    TextDirection dir;
225    return NSStringOrNil(_result->title(dir));
226}
227
228- (NSURL *)_absoluteLinkURL
229{
230    return _result->absoluteLinkURL();
231}
232
233- (WebFrame *)_targetWebFrame
234{
235    return kit(_result->targetFrame());
236}
237
238- (NSString *)_titleDisplayString
239{
240    return NSStringOrNil(_result->titleDisplayString());
241}
242
243- (NSString *)_textContent
244{
245    return NSStringOrNil(_result->textContent());
246}
247
248- (NSNumber *)_isLiveLink
249{
250    return [NSNumber numberWithBool:_result->isLiveLink()];
251}
252
253- (NSNumber *)_isContentEditable
254{
255    return [NSNumber numberWithBool:_result->isContentEditable()];
256}
257
258- (NSNumber *)_isInScrollBar
259{
260    return [NSNumber numberWithBool:_result->scrollbar() != 0];
261}
262
263@end
264