1/*
2 * Copyright (C) 2018 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 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "TextUtil.h"
28
29#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
30
31#include "FontCascade.h"
32#include "RenderStyle.h"
33
34namespace WebCore {
35namespace Layout {
36
37Optional<ItemPosition> TextUtil::hyphenPositionBefore(const InlineItem&, ItemPosition, unsigned)
38{
39 return WTF::nullopt;
40}
41
42LayoutUnit TextUtil::width(const InlineItem& inlineTextItem, ItemPosition from, ItemPosition to, LayoutUnit contentLogicalLeft)
43{
44 auto& style = inlineTextItem.style();
45 auto& font = style.fontCascade();
46 if (!font.size() || from == to)
47 return 0;
48
49 auto text = inlineTextItem.textContent();
50 ASSERT(to <= text.length());
51
52 if (font.isFixedPitch())
53 return fixedPitchWidth(text, style, from, to, contentLogicalLeft);
54
55 auto hasKerningOrLigatures = font.enableKerning() || font.requiresShaping();
56 auto measureWithEndSpace = hasKerningOrLigatures && to < text.length() && text[to] == ' ';
57 if (measureWithEndSpace)
58 ++to;
59 LayoutUnit width;
60 auto tabWidth = style.collapseWhiteSpace() ? 0 : style.tabSize();
61
62 WebCore::TextRun run(StringView(text).substring(from, to - from), contentLogicalLeft);
63 if (tabWidth)
64 run.setTabSize(true, tabWidth);
65 width = font.width(run);
66
67 if (measureWithEndSpace)
68 width -= (font.spaceWidth() + font.wordSpacing());
69
70 return std::max<LayoutUnit>(0, width);
71}
72
73LayoutUnit TextUtil::fixedPitchWidth(String text, const RenderStyle& style, ItemPosition from, ItemPosition to, LayoutUnit contentLogicalLeft)
74{
75 auto& font = style.fontCascade();
76 auto monospaceCharacterWidth = font.spaceWidth();
77 LayoutUnit width;
78 for (auto i = from; i < to; ++i) {
79 auto character = text[i];
80 if (character >= ' ' || character == '\n')
81 width += monospaceCharacterWidth;
82 else if (character == '\t')
83 width += style.collapseWhiteSpace() ? monospaceCharacterWidth : font.tabWidth(style.tabSize(), contentLogicalLeft + width);
84
85 if (i > from && (character == ' ' || character == '\t' || character == '\n'))
86 width += font.wordSpacing();
87 }
88
89 return width;
90}
91
92}
93}
94#endif
95