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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/PlainTextRange.h"
     45 #include "core/editing/TextIterator.h"
     46 #include "core/html/HTMLElement.h"
     47 #include "core/frame/Frame.h"
     48 #include "core/frame/FrameView.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 
     55 using namespace WebCore;
     56 
     57 namespace blink {
     58 
     59 NSAttributedString* WebSubstringUtil::attributedSubstringInRange(WebFrame* webFrame, size_t location, size_t length)
     60 {
     61     Frame* frame = toWebFrameImpl(webFrame)->frame();
     62     if (frame->view()->needsLayout())
     63         frame->view()->layout();
     64 
     65     Element* editable = frame->selection().rootEditableElementOrDocumentElement();
     66     ASSERT(editable);
     67     RefPtr<Range> range(PlainTextRange(location, location + length).createRange(*editable));
     68     if (!range)
     69         return nil;
     70 
     71     NSMutableAttributedString* string = [[NSMutableAttributedString alloc] init];
     72     NSMutableDictionary* attrs = [NSMutableDictionary dictionary];
     73 
     74     unsigned position = 0;
     75     for (TextIterator it(range.get()); !it.atEnd() && [string length] < length; it.advance()) {
     76         unsigned numCharacters = it.length();
     77         if (!numCharacters)
     78             continue;
     79 
     80         Node* container = it.range()->startContainer(IGNORE_EXCEPTION);
     81         RenderObject* renderer = container->renderer();
     82         ASSERT(renderer);
     83         if (!renderer)
     84             continue;
     85 
     86         RenderStyle* style = renderer->style();
     87         NSFont* font = style->font().primaryFont()->getNSFont();
     88         // If the platform font can't be loaded, it's likely that the site is
     89         // using a web font. For now, just use the default font instead.
     90         // TODO(rsesek): Change the font activation flags to allow other processes
     91         // to use the font.
     92         if (!font)
     93           font = [NSFont systemFontOfSize:style->font().size()];
     94         [attrs setObject:font forKey:NSFontAttributeName];
     95 
     96         if (style->visitedDependentColor(CSSPropertyColor).alpha())
     97             [attrs setObject:nsColor(style->visitedDependentColor(CSSPropertyColor)) forKey:NSForegroundColorAttributeName];
     98         else
     99             [attrs removeObjectForKey:NSForegroundColorAttributeName];
    100         if (style->visitedDependentColor(CSSPropertyBackgroundColor).alpha())
    101             [attrs setObject:nsColor(style->visitedDependentColor(CSSPropertyBackgroundColor)) forKey:NSBackgroundColorAttributeName];
    102         else
    103             [attrs removeObjectForKey:NSBackgroundColorAttributeName];
    104 
    105         Vector<UChar> characters;
    106         it.appendTextTo(characters);
    107         NSString* substring =
    108             [[[NSString alloc] initWithCharacters:characters.data()
    109                                            length:characters.size()] autorelease];
    110         [string replaceCharactersInRange:NSMakeRange(position, 0)
    111                               withString:substring];
    112         [string setAttributes:attrs range:NSMakeRange(position, numCharacters)];
    113         position += numCharacters;
    114     }
    115     return [string autorelease];
    116 }
    117 
    118 } // namespace blink
    119