1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
4 *           (C) 2000 Simon Hausmann <hausmann@kde.org>
5 * Copyright (C) 2003, 2006, 2008, 2010 Apple Inc. All rights reserved.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB.  If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 */
22
23#include "config.h"
24#include "core/html/HTMLFontElement.h"
25
26#include "CSSPropertyNames.h"
27#include "CSSValueKeywords.h"
28#include "HTMLNames.h"
29#include "core/css/CSSValueList.h"
30#include "core/css/CSSValuePool.h"
31#include "core/css/StylePropertySet.h"
32#include "core/html/parser/HTMLParserIdioms.h"
33#include "wtf/text/StringBuilder.h"
34
35using namespace WTF;
36
37namespace WebCore {
38
39using namespace HTMLNames;
40
41HTMLFontElement::HTMLFontElement(Document& document)
42    : HTMLElement(fontTag, document)
43{
44    ScriptWrappable::init(this);
45}
46
47PassRefPtr<HTMLFontElement> HTMLFontElement::create(Document& document)
48{
49    return adoptRef(new HTMLFontElement(document));
50}
51
52// http://www.whatwg.org/specs/web-apps/current-work/multipage/rendering.html#fonts-and-colors
53template <typename CharacterType>
54static bool parseFontSize(const CharacterType* characters, unsigned length, int& size)
55{
56
57    // Step 1
58    // Step 2
59    const CharacterType* position = characters;
60    const CharacterType* end = characters + length;
61
62    // Step 3
63    while (position < end) {
64        if (!isHTMLSpace<CharacterType>(*position))
65            break;
66        ++position;
67    }
68
69    // Step 4
70    if (position == end)
71        return false;
72    ASSERT(position < end);
73
74    // Step 5
75    enum {
76        RelativePlus,
77        RelativeMinus,
78        Absolute
79    } mode;
80
81    switch (*position) {
82    case '+':
83        mode = RelativePlus;
84        ++position;
85        break;
86    case '-':
87        mode = RelativeMinus;
88        ++position;
89        break;
90    default:
91        mode = Absolute;
92        break;
93    }
94
95    // Step 6
96    StringBuilder digits;
97    digits.reserveCapacity(16);
98    while (position < end) {
99        if (!isASCIIDigit(*position))
100            break;
101        digits.append(*position++);
102    }
103
104    // Step 7
105    if (digits.isEmpty())
106        return false;
107
108    // Step 8
109    int value;
110
111    if (digits.is8Bit())
112        value = charactersToIntStrict(digits.characters8(), digits.length());
113    else
114        value = charactersToIntStrict(digits.characters16(), digits.length());
115
116    // Step 9
117    if (mode == RelativePlus)
118        value += 3;
119    else if (mode == RelativeMinus)
120        value = 3 - value;
121
122    // Step 10
123    if (value > 7)
124        value = 7;
125
126    // Step 11
127    if (value < 1)
128        value = 1;
129
130    size = value;
131    return true;
132}
133
134static bool parseFontSize(const String& input, int& size)
135{
136    if (input.isEmpty())
137        return false;
138
139    if (input.is8Bit())
140        return parseFontSize(input.characters8(), input.length(), size);
141
142    return parseFontSize(input.characters16(), input.length(), size);
143}
144
145bool HTMLFontElement::cssValueFromFontSizeNumber(const String& s, CSSValueID& size)
146{
147    int num = 0;
148    if (!parseFontSize(s, num))
149        return false;
150
151    switch (num) {
152    case 1:
153        // FIXME: The spec says that we're supposed to use CSSValueXxSmall here.
154        size = CSSValueXSmall;
155        break;
156    case 2:
157        size = CSSValueSmall;
158        break;
159    case 3:
160        size = CSSValueMedium;
161        break;
162    case 4:
163        size = CSSValueLarge;
164        break;
165    case 5:
166        size = CSSValueXLarge;
167        break;
168    case 6:
169        size = CSSValueXxLarge;
170        break;
171    case 7:
172        size = CSSValueWebkitXxxLarge;
173        break;
174    default:
175        ASSERT_NOT_REACHED();
176    }
177    return true;
178}
179
180bool HTMLFontElement::isPresentationAttribute(const QualifiedName& name) const
181{
182    if (name == sizeAttr || name == colorAttr || name == faceAttr)
183        return true;
184    return HTMLElement::isPresentationAttribute(name);
185}
186
187void HTMLFontElement::collectStyleForPresentationAttribute(const QualifiedName& name, const AtomicString& value, MutableStylePropertySet* style)
188{
189    if (name == sizeAttr) {
190        CSSValueID size = CSSValueInvalid;
191        if (cssValueFromFontSizeNumber(value, size))
192            addPropertyToPresentationAttributeStyle(style, CSSPropertyFontSize, size);
193    } else if (name == colorAttr)
194        addHTMLColorToStyle(style, CSSPropertyColor, value);
195    else if (name == faceAttr) {
196        if (RefPtr<CSSValueList> fontFaceValue = cssValuePool().createFontFaceValue(value))
197            style->setProperty(CSSProperty(CSSPropertyFontFamily, fontFaceValue.release()));
198    } else
199        HTMLElement::collectStyleForPresentationAttribute(name, value, style);
200}
201
202}
203