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1 /* | |
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org) | |
3 * (C) 1999 Antti Koivisto (koivisto@kde.org) | |
4 * (C) 2007 David Smith (catfish.man@gmail.com) | |
5 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved. | |
6 * Copyright (C) Research In Motion Limited 2010. All rights reserved. | |
7 * | |
8 * This library is free software; you can redistribute it and/or | |
9 * modify it under the terms of the GNU Library General Public | |
10 * License as published by the Free Software Foundation; either | |
11 * version 2 of the License, or (at your option) any later version. | |
12 * | |
13 * This library is distributed in the hope that it will be useful, | |
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 * Library General Public License for more details. | |
17 * | |
18 * You should have received a copy of the GNU Library General Public License | |
19 * along with this library; see the file COPYING.LIB. If not, write to | |
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
21 * Boston, MA 02110-1301, USA. | |
22 */ | |
23 | |
24 #include "config.h" | |
25 #include "core/dom/FirstLetterPseudoElement.h" | |
26 | |
27 #include "core/dom/Element.h" | |
28 #include "core/rendering/RenderObject.h" | |
29 #include "core/rendering/RenderObjectInlines.h" | |
30 #include "core/rendering/RenderText.h" | |
31 #include "core/rendering/RenderTextFragment.h" | |
32 #include "wtf/text/WTFString.h" | |
33 #include "wtf/unicode/icu/UnicodeIcu.h" | |
34 | |
35 namespace blink { | |
36 | |
37 using namespace WTF; | |
38 using namespace Unicode; | |
39 | |
40 // CSS 2.1 http://www.w3.org/TR/CSS21/selector.html#first-letter | |
41 // "Punctuation (i.e, characters defined in Unicode [UNICODE] in the "open" (Ps) , "close" (Pe), | |
42 // "initial" (Pi). "final" (Pf) and "other" (Po) punctuation classes), that prec edes or follows the first letter should be included" | |
43 static inline bool isPunctuationForFirstLetter(UChar c) | |
44 { | |
45 CharCategory charCategory = category(c); | |
46 return charCategory == Punctuation_Open | |
47 || charCategory == Punctuation_Close | |
48 || charCategory == Punctuation_InitialQuote | |
49 || charCategory == Punctuation_FinalQuote | |
50 || charCategory == Punctuation_Other; | |
51 } | |
52 | |
53 static inline bool isSpaceForFirstLetter(UChar c) | |
54 { | |
55 return isSpaceOrNewline(c) || c == noBreakSpace; | |
56 } | |
57 | |
58 unsigned FirstLetterPseudoElement::firstLetterLength(const String& text) | |
59 { | |
60 unsigned length = 0; | |
61 unsigned textLength = text.length(); | |
62 | |
63 if (textLength == 0) | |
64 return length; | |
65 | |
66 // Account for leading spaces first. | |
67 while (length < textLength && isSpaceForFirstLetter(text[length])) | |
68 length++; | |
69 // Now account for leading punctuation. | |
70 while (length < textLength && isPunctuationForFirstLetter(text[length])) | |
71 length++; | |
72 | |
73 // Bail if we didn't find a letter before the end of the text or before a sp ace. | |
74 if (isSpaceForFirstLetter(text[length]) || length == textLength) | |
75 return 0; | |
76 | |
77 // Account the next character for first letter. | |
78 length++; | |
79 | |
80 // Keep looking for allowed punctuation for the :first-letter. | |
81 for (; length < textLength; ++length) { | |
82 UChar c = text[length]; | |
83 if (!isPunctuationForFirstLetter(c)) | |
84 break; | |
85 } | |
86 return length; | |
87 } | |
88 | |
89 // Once we see any of these renderers we can stop looking for first-letter as | |
90 // they signal the end of the first line of text. | |
91 static bool isInvalidFirstLetterRenderer(const RenderObject* obj) | |
92 { | |
93 return (obj->isBR() || (obj->isText() && toRenderText(obj)->isWordBreak())); | |
94 } | |
95 | |
96 RenderObject* FirstLetterPseudoElement::firstLetterTextRenderer(const Element& e lement) | |
97 { | |
98 RenderObject* parentRenderer = 0; | |
99 | |
100 // If we are looking at a first letter element then we need to find the | |
101 // first letter text renderer from the parent node, and not ourselves. | |
102 if (element.isFirstLetterPseudoElement()) | |
103 parentRenderer = element.parentOrShadowHostElement()->renderer(); | |
104 else | |
105 parentRenderer = element.renderer(); | |
106 | |
107 if (!parentRenderer | |
108 || !parentRenderer->style()->hasPseudoStyle(FIRST_LETTER) | |
109 || !parentRenderer->canHaveGeneratedChildren() | |
110 || !(parentRenderer->isRenderBlockFlow() || parentRenderer->isRenderButt on())) | |
111 return nullptr; | |
112 | |
113 // Drill down into our children and look for our first text child. | |
114 RenderObject* firstLetterTextRenderer = parentRenderer->slowFirstChild(); | |
115 while (firstLetterTextRenderer) { | |
116 // This can be called when the first letter renderer is already in the t ree. We do not | |
117 // want to consider that renderer for our text renderer so we go to the sibling (which is | |
118 // the RenderTextFragment for the remaining text). | |
119 if (firstLetterTextRenderer->style() && firstLetterTextRenderer->style() ->styleType() == FIRST_LETTER) { | |
120 firstLetterTextRenderer = firstLetterTextRenderer->nextSibling(); | |
121 } else if (firstLetterTextRenderer->isText()) { | |
122 // FIXME: If there is leading punctuation in a different RenderText than | |
123 // the first letter, we'll not apply the correct style to it. | |
124 RefPtr<StringImpl> str = toRenderText(firstLetterTextRenderer)->isTe xtFragment() ? | |
125 toRenderTextFragment(firstLetterTextRenderer)->completeText() : | |
126 toRenderText(firstLetterTextRenderer)->originalText(); | |
127 if (firstLetterLength(str.get()) || isInvalidFirstLetterRenderer(fir stLetterTextRenderer)) | |
128 break; | |
129 firstLetterTextRenderer = firstLetterTextRenderer->nextSibling(); | |
130 } else if (firstLetterTextRenderer->isListMarker()) { | |
131 firstLetterTextRenderer = firstLetterTextRenderer->nextSibling(); | |
132 } else if (firstLetterTextRenderer->isFloatingOrOutOfFlowPositioned()) { | |
133 if (firstLetterTextRenderer->style()->styleType() == FIRST_LETTER) { | |
134 firstLetterTextRenderer = firstLetterTextRenderer->slowFirstChil d(); | |
135 break; | |
136 } | |
137 firstLetterTextRenderer = firstLetterTextRenderer->nextSibling(); | |
138 } else if (firstLetterTextRenderer->isReplaced() || firstLetterTextRende rer->isRenderButton() | |
139 || firstLetterTextRenderer->isMenuList()) { | |
140 return nullptr; | |
141 } else if (firstLetterTextRenderer->isFlexibleBoxIncludingDeprecated() | | firstLetterTextRenderer->isRenderGrid()) { | |
142 return nullptr; | |
143 } else if (firstLetterTextRenderer->style()->hasPseudoStyle(FIRST_LETTER ) | |
144 && firstLetterTextRenderer->canHaveGeneratedChildren()) { | |
145 // There is a renderer further down the tree which has FIRST_LETTER set. When that node | |
146 // is attached we will handle setting up the first letter then. | |
147 return nullptr; | |
148 } else { | |
149 firstLetterTextRenderer = firstLetterTextRenderer->slowFirstChild(); | |
150 } | |
151 } | |
152 | |
153 // No first letter text to display, we're done. | |
154 // FIXME: This black-list of disallowed RenderText subclasses is fragile. cr bug.com/422336. | |
155 // Should counter be on this list? What about RenderTextFragment? | |
156 if (!firstLetterTextRenderer || !firstLetterTextRenderer->isText() || isInva lidFirstLetterRenderer(firstLetterTextRenderer)) | |
157 return nullptr; | |
158 | |
159 return firstLetterTextRenderer; | |
160 } | |
161 | |
162 FirstLetterPseudoElement::FirstLetterPseudoElement(Element* parent) | |
163 : PseudoElement(parent, FIRST_LETTER) | |
164 , m_remainingTextRenderer(nullptr) | |
165 , m_needsUpdate(false) | |
166 , m_isDetaching(false) | |
167 { | |
168 } | |
169 | |
170 FirstLetterPseudoElement::~FirstLetterPseudoElement() | |
171 { | |
172 } | |
173 | |
174 void FirstLetterPseudoElement::trace(Visitor* visitor) | |
175 { | |
176 visitor->trace(m_remainingTextRenderer); | |
177 PseudoElement::trace(visitor); | |
178 } | |
179 | |
180 void FirstLetterPseudoElement::setNeedsUpdate() | |
181 { | |
182 m_needsUpdate = true; | |
183 bool neededRecalc = needsStyleRecalc(); | |
184 setNeedsStyleRecalc(LocalStyleChange, StyleChangeReasonForTracing::create(St yleChangeReason::PseudoClass)); | |
185 | |
186 // If style recalc is currently executing, and we have already been recalc'd | |
187 // we need to tell our parent to do the recalc again because we need to | |
188 // re-initialize the first letter state. This can happen for things like | |
189 // RenderQuote where quotes processed later can effect things already styled . | |
190 if (document().inStyleRecalc() && !m_isDetaching && !neededRecalc && parentN ode() && parentNode()->isElementNode()) | |
191 toElement(parentNode())->recalcStyle(UpdatePseudoElements); | |
192 } | |
193 | |
194 void FirstLetterPseudoElement::attach(const AttachContext& context) | |
195 { | |
196 PseudoElement::attach(context); | |
197 attachFirstLetterTextRenderers(); | |
198 } | |
199 | |
200 void FirstLetterPseudoElement::detach(const AttachContext& context) | |
201 { | |
202 m_isDetaching = true; | |
Julien - ping for review
2014/11/14 19:31:00
TemporaryChange<bool> isInDetach(&m_isDetaching);
dsinclair
2014/11/14 20:17:39
Done.
| |
203 if (m_remainingTextRenderer) { | |
204 if (m_remainingTextRenderer->node()) { | |
205 Text* textNode = toText(m_remainingTextRenderer->node()); | |
206 m_remainingTextRenderer->setText(textNode->dataImpl(), true); | |
207 } | |
208 m_remainingTextRenderer->setFirstLetterPseudoElement(nullptr); | |
209 } | |
210 m_remainingTextRenderer = nullptr; | |
211 | |
212 PseudoElement::detach(context); | |
213 m_isDetaching = false; | |
214 } | |
215 | |
216 | |
217 RenderStyle* FirstLetterPseudoElement::styleForFirstLetter(RenderObject* rendere rContainer) | |
218 { | |
219 ASSERT(rendererContainer); | |
220 | |
221 RenderObject* styleContainer = parentOrShadowHostElement()->renderer(); | |
222 ASSERT(styleContainer); | |
223 | |
224 // We always force the pseudo style to recompute as the first-letter style | |
225 // computed by the style container may not have taken the renderers styles | |
226 // into account. | |
227 styleContainer->style()->removeCachedPseudoStyle(FIRST_LETTER); | |
228 | |
229 RenderStyle* pseudoStyle = styleContainer->getCachedPseudoStyle(FIRST_LETTER , rendererContainer->firstLineStyle()); | |
230 ASSERT(pseudoStyle); | |
231 | |
232 // Force inline display (except for floating first-letters). | |
233 pseudoStyle->setDisplay(pseudoStyle->isFloating() ? BLOCK : INLINE); | |
234 | |
235 // CSS2 says first-letter can't be positioned. | |
236 pseudoStyle->setPosition(StaticPosition); | |
237 | |
238 return pseudoStyle; | |
239 } | |
240 | |
241 void FirstLetterPseudoElement::attachFirstLetterTextRenderers() | |
242 { | |
243 RenderObject* nextRenderer = FirstLetterPseudoElement::firstLetterTextRender er(*this); | |
244 ASSERT(nextRenderer); | |
245 ASSERT(nextRenderer->isText()); | |
246 | |
247 // The original string is going to be either a generated content string or a DOM node's | |
248 // string. We want the original string before it got transformed in case fir st-letter has | |
249 // no text-transform or a different text-transform applied to it. | |
250 String oldText = toRenderText(nextRenderer)->isTextFragment() ? toRenderText Fragment(nextRenderer)->completeText() : toRenderText(nextRenderer)->originalTex t(); | |
251 ASSERT(oldText.impl()); | |
252 | |
253 RenderStyle* pseudoStyle = styleForFirstLetter(nextRenderer->parent()); | |
254 renderer()->setStyle(pseudoStyle); | |
255 | |
256 // FIXME: This would already have been calculated in firstLetterRenderer. Ca n we pass the length through? | |
257 unsigned length = FirstLetterPseudoElement::firstLetterLength(oldText); | |
258 | |
259 // Construct a text fragment for the text after the first letter. | |
260 // This text fragment might be empty. | |
261 RenderTextFragment* remainingText = | |
262 new RenderTextFragment(nextRenderer->node() ? nextRenderer->node() : &ne xtRenderer->document(), oldText.impl(), length, oldText.length() - length); | |
263 remainingText->setFirstLetterPseudoElement(this); | |
264 remainingText->setIsRemainingTextRenderer(); | |
265 remainingText->setStyle(nextRenderer->style()); | |
266 | |
267 if (remainingText->node()) | |
268 remainingText->node()->setRenderer(remainingText); | |
269 | |
270 m_remainingTextRenderer = remainingText; | |
271 | |
272 RenderObject* nextSibling = renderer()->nextSibling(); | |
273 renderer()->parent()->addChild(remainingText, nextSibling); | |
274 | |
275 // Construct text fragment for the first letter. | |
276 RenderTextFragment* letter = new RenderTextFragment(&nextRenderer->document( ), oldText.impl(), 0, length); | |
277 letter->setFirstLetterPseudoElement(this); | |
278 letter->setStyle(pseudoStyle); | |
279 renderer()->addChild(letter); | |
280 | |
281 nextRenderer->destroy(); | |
282 } | |
283 | |
284 void FirstLetterPseudoElement::didRecalcStyle(StyleRecalcChange) | |
285 { | |
286 if (!renderer()) | |
287 return; | |
288 | |
289 // The renderers inside pseudo elements are anonymous so they don't get noti fied of recalcStyle and must have | |
290 // the style propagated downward manually similar to RenderObject::propagate StyleToAnonymousChildren. | |
291 RenderObject* renderer = this->renderer(); | |
292 for (RenderObject* child = renderer->nextInPreOrder(renderer); child; child = child->nextInPreOrder(renderer)) { | |
293 // We need to re-calculate the correct style for the first letter elemen t | |
294 // and then apply that to the container and the text fragment inside. | |
295 if (child->style()->styleType() == FIRST_LETTER && m_remainingTextRender er) { | |
296 if (RenderStyle* pseudoStyle = styleForFirstLetter(m_remainingTextRe nderer->parent())) | |
297 child->setPseudoStyle(pseudoStyle); | |
298 continue; | |
299 } | |
300 | |
301 // We only manage the style for the generated content items. | |
302 if (!child->isText() && !child->isQuote() && !child->isImage()) | |
303 continue; | |
304 | |
305 child->setPseudoStyle(renderer->style()); | |
306 } | |
307 } | |
308 | |
309 } // namespace blink | |
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