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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 "WebSubstringUtil.h"
     34 
     35 #import <Cocoa/Cocoa.h>
     36 
     37 #include "WebFrameImpl.h"
     38 #include "bindings/v8/ExceptionStatePlaceholder.h"
     39 #include "core/dom/Document.h"
     40 #include "core/dom/Element.h"
     41 #include "core/dom/Node.h"
     42 #include "core/dom/Range.h"
     43 #include "core/editing/FrameSelection.h"
     44 #include "core/editing/TextIterator.h"
     45 #include "core/html/HTMLElement.h"
     46 #include "core/page/Frame.h"
     47 #include "core/page/FrameView.h"
     48 #include "core/platform/graphics/Font.h"
     49 #include "core/platform/graphics/mac/ColorMac.h"
     50 #include "core/rendering/RenderObject.h"
     51 #include "core/rendering/style/RenderStyle.h"
     52 #include "public/platform/WebRect.h"
     53 
     54 using namespace WebCore;
     55 
     56 namespace WebKit {
     57 
     58 NSAttributedString* WebSubstringUtil::attributedSubstringInRange(WebFrame* webFrame, size_t location, size_t length)
     59 {
     60     Frame* frame = static_cast<WebFrameImpl*>(webFrame)->frame();
     61     if (frame->view()->needsLayout())
     62         frame->view()->layout();
     63 
     64     RefPtr<Range> range(TextIterator::rangeFromLocationAndLength(frame->selection()->rootEditableElementOrDocumentElement(), location, length));
     65     if (!range)
     66         return nil;
     67 
     68     NSMutableAttributedString* string = [[NSMutableAttributedString alloc] init];
     69     NSMutableDictionary* attrs = [NSMutableDictionary dictionary];
     70 
     71     unsigned position = 0;
     72     for (TextIterator it(range.get()); !it.atEnd() && [string length] < length; it.advance()) {
     73         unsigned numCharacters = it.length();
     74         if (!numCharacters)
     75             continue;
     76 
     77         Node* container = it.range()->startContainer(IGNORE_EXCEPTION);
     78         RenderObject* renderer = container->renderer();
     79         ASSERT(renderer);
     80         if (!renderer)
     81             continue;
     82 
     83         RenderStyle* style = renderer->style();
     84         NSFont* font = style->font().primaryFont()->getNSFont();
     85         // If the platform font can't be loaded, it's likely that the site is
     86         // using a web font. For now, just use the default font instead.
     87         // TODO(rsesek): Change the font activation flags to allow other processes
     88         // to use the font.
     89         if (!font)
     90           font = [NSFont systemFontOfSize:style->font().size()];
     91         [attrs setObject:font forKey:NSFontAttributeName];
     92 
     93         if (style->visitedDependentColor(CSSPropertyColor).alpha())
     94             [attrs setObject:nsColor(renderer->resolveColor(CSSPropertyColor)) forKey:NSForegroundColorAttributeName];
     95         else
     96             [attrs removeObjectForKey:NSForegroundColorAttributeName];
     97         if (style->visitedDependentColor(CSSPropertyBackgroundColor).alpha())
     98             [attrs setObject:nsColor(renderer->resolveColor(CSSPropertyBackgroundColor)) forKey:NSBackgroundColorAttributeName];
     99         else
    100             [attrs removeObjectForKey:NSBackgroundColorAttributeName];
    101 
    102         Vector<UChar> characters;
    103         it.appendTextTo(characters);
    104         NSString* substring =
    105             [[[NSString alloc] initWithCharacters:characters.data()
    106                                            length:characters.size()] autorelease];
    107         [string replaceCharactersInRange:NSMakeRange(position, 0)
    108                               withString:substring];
    109         [string setAttributes:attrs range:NSMakeRange(position, numCharacters)];
    110         position += numCharacters;
    111     }
    112     return [string autorelease];
    113 }
    114 
    115 } // namespace WebKit
    116