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1/*
2 * Copyright (C) 2005, 2007, 2008 Apple Inc. All rights reserved.
3 * Copyright (C) 2011 Google Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *     * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "config.h"
33#include "public/web/mac/WebSubstringUtil.h"
34
35#import <Cocoa/Cocoa.h>
36
37#include "bindings/v8/ExceptionStatePlaceholder.h"
38#include "core/dom/Document.h"
39#include "core/dom/Element.h"
40#include "core/dom/Node.h"
41#include "core/dom/Range.h"
42#include "core/editing/FrameSelection.h"
43#include "core/editing/PlainTextRange.h"
44#include "core/editing/TextIterator.h"
45#include "core/frame/FrameView.h"
46#include "core/frame/LocalFrame.h"
47#include "core/html/HTMLElement.h"
48#include "core/rendering/HitTestResult.h"
49#include "core/rendering/RenderObject.h"
50#include "core/rendering/style/RenderStyle.h"
51#include "platform/fonts/Font.h"
52#include "platform/mac/ColorMac.h"
53#include "public/platform/WebRect.h"
54#include "public/web/WebHitTestResult.h"
55#include "public/web/WebRange.h"
56#include "public/web/WebView.h"
57#include "web/WebLocalFrameImpl.h"
58
59using namespace WebCore;
60
61static NSAttributedString* attributedSubstringFromRange(const Range* range)
62{
63    NSMutableAttributedString* string = [[NSMutableAttributedString alloc] init];
64    NSMutableDictionary* attrs = [NSMutableDictionary dictionary];
65    size_t length = range->endOffset() - range->startOffset();
66
67    unsigned position = 0;
68    for (TextIterator it(range); !it.atEnd() && [string length] < length; it.advance()) {
69        unsigned numCharacters = it.length();
70        if (!numCharacters)
71            continue;
72
73        Node* container = it.range()->startContainer();
74        RenderObject* renderer = container->renderer();
75        ASSERT(renderer);
76        if (!renderer)
77            continue;
78
79        RenderStyle* style = renderer->style();
80        NSFont* font = style->font().primaryFont()->getNSFont();
81        // If the platform font can't be loaded, it's likely that the site is
82        // using a web font. For now, just use the default font instead.
83        // TODO(rsesek): Change the font activation flags to allow other processes
84        // to use the font.
85        if (!font)
86          font = [NSFont systemFontOfSize:style->font().fontDescription().computedSize()];
87        [attrs setObject:font forKey:NSFontAttributeName];
88
89        if (style->visitedDependentColor(CSSPropertyColor).alpha())
90            [attrs setObject:nsColor(style->visitedDependentColor(CSSPropertyColor)) forKey:NSForegroundColorAttributeName];
91        else
92            [attrs removeObjectForKey:NSForegroundColorAttributeName];
93        if (style->visitedDependentColor(CSSPropertyBackgroundColor).alpha())
94            [attrs setObject:nsColor(style->visitedDependentColor(CSSPropertyBackgroundColor)) forKey:NSBackgroundColorAttributeName];
95        else
96            [attrs removeObjectForKey:NSBackgroundColorAttributeName];
97
98        Vector<UChar> characters;
99        it.appendTextTo(characters);
100        NSString* substring =
101            [[[NSString alloc] initWithCharacters:characters.data()
102                                           length:characters.size()] autorelease];
103        [string replaceCharactersInRange:NSMakeRange(position, 0)
104                              withString:substring];
105        [string setAttributes:attrs range:NSMakeRange(position, numCharacters)];
106        position += numCharacters;
107    }
108    return [string autorelease];
109}
110
111namespace blink {
112
113NSAttributedString* WebSubstringUtil::attributedWordAtPoint(WebView* view, WebPoint point, WebPoint& baselinePoint)
114{
115    HitTestResult result = view->hitTestResultAt(point);
116    if (!result.targetNode())
117      return nil;
118    LocalFrame* frame = result.targetNode()->document().frame();
119    FrameView* frameView = frame->view();
120
121    RefPtrWillBeRawPtr<Range> range = frame->rangeForPoint(result.roundedPointInInnerNodeFrame());
122    if (!range)
123        return nil;
124
125    // Expand to word under point.
126    VisibleSelection selection(range.get());
127    selection.expandUsingGranularity(WordGranularity);
128    RefPtrWillBeRawPtr<Range> wordRange = selection.toNormalizedRange();
129
130    // Convert to NSAttributedString.
131    NSAttributedString* string = attributedSubstringFromRange(wordRange.get());
132
133    // Compute bottom left corner and convert to AppKit coordinates.
134    IntRect stringRect = enclosingIntRect(wordRange->boundingRect());
135    IntPoint stringPoint = stringRect.minXMaxYCorner();
136    stringPoint.setY(frameView->height() - stringPoint.y());
137
138    // Adjust for the font's descender. AppKit wants the baseline point.
139    if ([string length]) {
140        NSDictionary* attributes = [string attributesAtIndex:0 effectiveRange:NULL];
141        NSFont* font = [attributes objectForKey:NSFontAttributeName];
142        if (font)
143            stringPoint.move(0, ceil(-[font descender]));
144    }
145
146    baselinePoint = stringPoint;
147    return string;
148}
149
150NSAttributedString* WebSubstringUtil::attributedSubstringInRange(WebLocalFrame* webFrame, size_t location, size_t length)
151{
152    LocalFrame* frame = toWebLocalFrameImpl(webFrame)->frame();
153    if (frame->view()->needsLayout())
154        frame->view()->layout();
155
156    Element* editable = frame->selection().rootEditableElementOrDocumentElement();
157    ASSERT(editable);
158    RefPtrWillBeRawPtr<Range> range(PlainTextRange(location, location + length).createRange(*editable));
159    if (!range)
160        return nil;
161
162    return attributedSubstringFromRange(range.get());
163}
164
165} // namespace blink
166