File: HTMLTextAreaElement.cpp

package info (click to toggle)
webkit2gtk 2.26.4-1~bpo9+3
  • links: PTS, VCS
  • area: main
  • in suites: stretch-backports-sloppy
  • size: 211,508 kB
  • sloc: cpp: 2,010,574; xml: 64,268; ansic: 41,975; python: 22,140; perl: 13,924; ruby: 12,643; asm: 5,641; yacc: 2,104; sh: 1,377; lex: 1,107; makefile: 86
file content (574 lines) | stat: -rw-r--r-- 19,148 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 *           (C) 2001 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2004-2019 Apple Inc. All rights reserved.
 *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
 * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "HTMLTextAreaElement.h"

#include "BeforeTextInsertedEvent.h"
#include "CSSValueKeywords.h"
#include "DOMFormData.h"
#include "Document.h"
#include "Editor.h"
#include "ElementChildIterator.h"
#include "Event.h"
#include "EventNames.h"
#include "FormController.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "HTMLNames.h"
#include "HTMLParserIdioms.h"
#include "LocalizedStrings.h"
#include "RenderTextControlMultiLine.h"
#include "ShadowRoot.h"
#include "Text.h"
#include "TextControlInnerElements.h"
#include "TextIterator.h"
#include "TextNodeTraversal.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/Ref.h>
#include <wtf/StdLibExtras.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(HTMLTextAreaElement);

using namespace HTMLNames;

static const int defaultRows = 2;
static const int defaultCols = 20;

// On submission, LF characters are converted into CRLF.
// This function returns number of characters considering this.
static inline unsigned computeLengthForSubmission(StringView text, unsigned numberOfLineBreaks)
{
    return numGraphemeClusters(text) + numberOfLineBreaks;
}

static unsigned numberOfLineBreaks(StringView text)
{
    unsigned length = text.length();
    unsigned count = 0;
    for (unsigned i = 0; i < length; i++) {
        if (text[i] == '\n')
            count++;
    }
    return count;
}

static inline unsigned computeLengthForSubmission(StringView text)
{
    return numGraphemeClusters(text) + numberOfLineBreaks(text);
}

static inline unsigned upperBoundForLengthForSubmission(StringView text, unsigned numberOfLineBreaks)
{
    return text.length() + numberOfLineBreaks;
}

HTMLTextAreaElement::HTMLTextAreaElement(const QualifiedName& tagName, Document& document, HTMLFormElement* form)
    : HTMLTextFormControlElement(tagName, document, form)
    , m_rows(defaultRows)
    , m_cols(defaultCols)
{
    ASSERT(hasTagName(textareaTag));
    setFormControlValueMatchesRenderer(true);
}

Ref<HTMLTextAreaElement> HTMLTextAreaElement::create(const QualifiedName& tagName, Document& document, HTMLFormElement* form)
{
    auto textArea = adoptRef(*new HTMLTextAreaElement(tagName, document, form));
    textArea->ensureUserAgentShadowRoot();
    return textArea;
}

void HTMLTextAreaElement::didAddUserAgentShadowRoot(ShadowRoot& root)
{
    root.appendChild(TextControlInnerTextElement::create(document()));
    updateInnerTextElementEditability();
}

const AtomString& HTMLTextAreaElement::formControlType() const
{
    static NeverDestroyed<const AtomString> textarea("textarea", AtomString::ConstructFromLiteral);
    return textarea;
}

FormControlState HTMLTextAreaElement::saveFormControlState() const
{
    return m_isDirty ? FormControlState { { value() } } : FormControlState { };
}

void HTMLTextAreaElement::restoreFormControlState(const FormControlState& state)
{
    setValue(state[0]);
}

void HTMLTextAreaElement::childrenChanged(const ChildChange& change)
{
    HTMLElement::childrenChanged(change);
    setLastChangeWasNotUserEdit();
    if (m_isDirty)
        setInnerTextValue(value());
    else
        setNonDirtyValue(defaultValue());
}

bool HTMLTextAreaElement::isPresentationAttribute(const QualifiedName& name) const
{
    if (name == alignAttr) {
        // Don't map 'align' attribute.  This matches what Firefox, Opera and IE do.
        // See http://bugs.webkit.org/show_bug.cgi?id=7075
        return false;
    }

    if (name == wrapAttr)
        return true;
    return HTMLTextFormControlElement::isPresentationAttribute(name);
}

void HTMLTextAreaElement::collectStyleForPresentationAttribute(const QualifiedName& name, const AtomString& value, MutableStyleProperties& style)
{
    if (name == wrapAttr) {
        if (shouldWrapText()) {
            addPropertyToPresentationAttributeStyle(style, CSSPropertyWhiteSpace, CSSValuePreWrap);
            addPropertyToPresentationAttributeStyle(style, CSSPropertyWordWrap, CSSValueBreakWord);
        } else {
            addPropertyToPresentationAttributeStyle(style, CSSPropertyWhiteSpace, CSSValuePre);
            addPropertyToPresentationAttributeStyle(style, CSSPropertyWordWrap, CSSValueNormal);
        }
    } else
        HTMLTextFormControlElement::collectStyleForPresentationAttribute(name, value, style);
}

void HTMLTextAreaElement::parseAttribute(const QualifiedName& name, const AtomString& value)
{
    if (name == rowsAttr) {
        unsigned rows = limitToOnlyHTMLNonNegativeNumbersGreaterThanZero(value, defaultRows);
        if (m_rows != rows) {
            m_rows = rows;
            if (renderer())
                renderer()->setNeedsLayoutAndPrefWidthsRecalc();
        }
    } else if (name == colsAttr) {
        unsigned cols = limitToOnlyHTMLNonNegativeNumbersGreaterThanZero(value, defaultCols);
        if (m_cols != cols) {
            m_cols = cols;
            if (renderer())
                renderer()->setNeedsLayoutAndPrefWidthsRecalc();
        }
    } else if (name == wrapAttr) {
        // The virtual/physical values were a Netscape extension of HTML 3.0, now deprecated.
        // The soft/hard /off values are a recommendation for HTML 4 extension by IE and NS 4.
        WrapMethod wrap;
        if (equalLettersIgnoringASCIICase(value, "physical") || equalLettersIgnoringASCIICase(value, "hard") || equalLettersIgnoringASCIICase(value, "on"))
            wrap = HardWrap;
        else if (equalLettersIgnoringASCIICase(value, "off"))
            wrap = NoWrap;
        else
            wrap = SoftWrap;
        if (wrap != m_wrap) {
            m_wrap = wrap;
            if (renderer())
                renderer()->setNeedsLayoutAndPrefWidthsRecalc();
        }
    } else if (name == maxlengthAttr)
        maxLengthAttributeChanged(value);
    else if (name == minlengthAttr)
        minLengthAttributeChanged(value);
    else
        HTMLTextFormControlElement::parseAttribute(name, value);
}

void HTMLTextAreaElement::maxLengthAttributeChanged(const AtomString& newValue)
{
    internalSetMaxLength(parseHTMLNonNegativeInteger(newValue).value_or(-1));
    updateValidity();
}

void HTMLTextAreaElement::minLengthAttributeChanged(const AtomString& newValue)
{
    internalSetMinLength(parseHTMLNonNegativeInteger(newValue).value_or(-1));
    updateValidity();
}

RenderPtr<RenderElement> HTMLTextAreaElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&)
{
    return createRenderer<RenderTextControlMultiLine>(*this, WTFMove(style));
}

bool HTMLTextAreaElement::appendFormData(DOMFormData& formData, bool)
{
    if (name().isEmpty())
        return false;

    Ref<HTMLTextAreaElement> protectedThis(*this);
    document().updateLayout();

    formData.append(name(), m_wrap == HardWrap ? valueWithHardLineBreaks() : value());

    auto& dirnameAttrValue = attributeWithoutSynchronization(dirnameAttr);
    if (!dirnameAttrValue.isNull())
        formData.append(dirnameAttrValue, directionForFormData());

    return true;    
}

void HTMLTextAreaElement::reset()
{
    setNonDirtyValue(defaultValue());
}

bool HTMLTextAreaElement::hasCustomFocusLogic() const
{
    return true;
}

int HTMLTextAreaElement::defaultTabIndex() const
{
    return 0;
}

bool HTMLTextAreaElement::isKeyboardFocusable(KeyboardEvent*) const
{
    // If a given text area can be focused at all, then it will always be keyboard focusable.
    return isFocusable();
}

bool HTMLTextAreaElement::isMouseFocusable() const
{
    return isFocusable();
}

void HTMLTextAreaElement::updateFocusAppearance(SelectionRestorationMode restorationMode, SelectionRevealMode revealMode)
{
    if (restorationMode == SelectionRestorationMode::SetDefault || !hasCachedSelection()) {
        // If this is the first focus, set a caret at the beginning of the text.  
        // This matches some browsers' behavior; see bug 11746 Comment #15.
        // http://bugs.webkit.org/show_bug.cgi?id=11746#c15
        setSelectionRange(0, 0, SelectionHasNoDirection, revealMode, Element::defaultFocusTextStateChangeIntent());
    } else
        restoreCachedSelection(revealMode, Element::defaultFocusTextStateChangeIntent());
}

void HTMLTextAreaElement::defaultEventHandler(Event& event)
{
    if (renderer() && (event.isMouseEvent() || event.type() == eventNames().blurEvent))
        forwardEvent(event);
    else if (renderer() && is<BeforeTextInsertedEvent>(event))
        handleBeforeTextInsertedEvent(downcast<BeforeTextInsertedEvent>(event));

    HTMLTextFormControlElement::defaultEventHandler(event);
}

void HTMLTextAreaElement::subtreeHasChanged()
{
    setFormControlValueMatchesRenderer(false);
    updateValidity();

    if (!focused())
        return;

    setChangedSinceLastFormControlChangeEvent(true);

    if (RefPtr<Frame> frame = document().frame())
        frame->editor().textDidChangeInTextArea(this);
    // When typing in a textarea, childrenChanged is not called, so we need to force the directionality check.
    calculateAndAdjustDirectionality();
}

void HTMLTextAreaElement::handleBeforeTextInsertedEvent(BeforeTextInsertedEvent& event) const
{
    ASSERT(renderer());
    int signedMaxLength = effectiveMaxLength();
    if (signedMaxLength < 0)
        return;
    unsigned unsignedMaxLength = static_cast<unsigned>(signedMaxLength);

    const String& currentValue = innerTextValue();
    unsigned numberOfLineBreaksInCurrentValue = numberOfLineBreaks(currentValue);
    if (upperBoundForLengthForSubmission(currentValue, numberOfLineBreaksInCurrentValue)
        + upperBoundForLengthForSubmission(event.text(), numberOfLineBreaks(event.text())) < unsignedMaxLength)
        return;

    unsigned currentLength = computeLengthForSubmission(currentValue, numberOfLineBreaksInCurrentValue);
    // selectionLength represents the selection length of this text field to be
    // removed by this insertion.
    // If the text field has no focus, we don't need to take account of the
    // selection length. The selection is the source of text drag-and-drop in
    // that case, and nothing in the text field will be removed.
    unsigned selectionLength = focused() ? computeLengthForSubmission(plainText(document().frame()->selection().selection().toNormalizedRange().get())) : 0;
    ASSERT(currentLength >= selectionLength);
    unsigned baseLength = currentLength - selectionLength;
    unsigned appendableLength = unsignedMaxLength > baseLength ? unsignedMaxLength - baseLength : 0;
    event.setText(sanitizeUserInputValue(event.text(), appendableLength));
}

String HTMLTextAreaElement::sanitizeUserInputValue(const String& proposedValue, unsigned maxLength)
{
    return proposedValue.left(numCodeUnitsInGraphemeClusters(proposedValue, maxLength));
}

RefPtr<TextControlInnerTextElement> HTMLTextAreaElement::innerTextElement() const
{
    RefPtr<ShadowRoot> root = userAgentShadowRoot();
    if (!root)
        return nullptr;
    
    return childrenOfType<TextControlInnerTextElement>(*root).first();
}

void HTMLTextAreaElement::rendererWillBeDestroyed()
{
    updateValue();
}

void HTMLTextAreaElement::updateValue() const
{
    if (formControlValueMatchesRenderer())
        return;

    ASSERT(renderer());
    m_value = innerTextValue();
    const_cast<HTMLTextAreaElement*>(this)->setFormControlValueMatchesRenderer(true);
    m_isDirty = true;
    m_wasModifiedByUser = true;
    const_cast<HTMLTextAreaElement*>(this)->updatePlaceholderVisibility();
}

String HTMLTextAreaElement::value() const
{
    updateValue();
    return m_value;
}

void HTMLTextAreaElement::setValue(const String& value)
{
    setValueCommon(value);
    m_isDirty = true;
    updateValidity();
}

void HTMLTextAreaElement::setNonDirtyValue(const String& value)
{
    setValueCommon(value);
    m_isDirty = false;
    updateValidity();
}

void HTMLTextAreaElement::setValueCommon(const String& newValue)
{
    m_wasModifiedByUser = false;
    // Code elsewhere normalizes line endings added by the user via the keyboard or pasting.
    // We normalize line endings coming from JavaScript here.
    String normalizedValue = newValue.isNull() ? emptyString() : newValue;
    normalizedValue.replace("\r\n", "\n");
    normalizedValue.replace('\r', '\n');

    // Return early because we don't want to move the caret or trigger other side effects
    // when the value isn't changing. This matches Firefox behavior, at least.
    if (normalizedValue == value())
        return;

    m_value = normalizedValue;
    setInnerTextValue(m_value);
    setLastChangeWasNotUserEdit();
    updatePlaceholderVisibility();
    invalidateStyleForSubtree();
    setFormControlValueMatchesRenderer(true);

    // Set the caret to the end of the text value.
    if (document().focusedElement() == this) {
        unsigned endOfString = m_value.length();
        setSelectionRange(endOfString, endOfString);
    }

    setTextAsOfLastFormControlChangeEvent(normalizedValue);
}

String HTMLTextAreaElement::defaultValue() const
{
    return TextNodeTraversal::childTextContent(*this);
}

void HTMLTextAreaElement::setDefaultValue(const String& defaultValue)
{
    setTextContent(defaultValue);
}

String HTMLTextAreaElement::validationMessage() const
{
    if (!willValidate())
        return String();

    if (customError())
        return customValidationMessage();

    if (valueMissing())
        return validationMessageValueMissingText();

    if (tooShort())
        return validationMessageTooShortText(computeLengthForSubmission(value()), minLength());

    if (tooLong())
        return validationMessageTooLongText(computeLengthForSubmission(value()), effectiveMaxLength());

    return String();
}

bool HTMLTextAreaElement::valueMissing() const
{
    return willValidate() && valueMissing(value());
}

bool HTMLTextAreaElement::tooShort() const
{
    return willValidate() && tooShort(value(), CheckDirtyFlag);
}

bool HTMLTextAreaElement::tooShort(StringView value, NeedsToCheckDirtyFlag check) const
{
    // Return false for the default value or value set by script even if it is
    // shorter than minLength.
    if (check == CheckDirtyFlag && !m_wasModifiedByUser)
        return false;

    int min = minLength();
    if (min <= 0)
        return false;

    // The empty string is excluded from tooShort validation.
    if (value.isEmpty())
        return false;

    // FIXME: The HTML specification says that the "number of characters" is measured using code-unit length and,
    // in the case of textarea elements, with all line breaks normalized to a single character (as opposed to CRLF pairs).
    unsigned unsignedMin = static_cast<unsigned>(min);
    unsigned numberOfLineBreaksInValue = numberOfLineBreaks(value);
    return upperBoundForLengthForSubmission(value, numberOfLineBreaksInValue) < unsignedMin
        && computeLengthForSubmission(value, numberOfLineBreaksInValue) < unsignedMin;
}

bool HTMLTextAreaElement::tooLong() const
{
    return willValidate() && tooLong(value(), CheckDirtyFlag);
}

bool HTMLTextAreaElement::tooLong(StringView value, NeedsToCheckDirtyFlag check) const
{
    // Return false for the default value or value set by script even if it is
    // longer than maxLength.
    if (check == CheckDirtyFlag && !m_wasModifiedByUser)
        return false;

    int max = effectiveMaxLength();
    if (max < 0)
        return false;

    // FIXME: The HTML specification says that the "number of characters" is measured using code-unit length and,
    // in the case of textarea elements, with all line breaks normalized to a single character (as opposed to CRLF pairs).
    unsigned unsignedMax = static_cast<unsigned>(max);
    unsigned numberOfLineBreaksInValue = numberOfLineBreaks(value);
    return upperBoundForLengthForSubmission(value, numberOfLineBreaksInValue) > unsignedMax
        && computeLengthForSubmission(value, numberOfLineBreaksInValue) > unsignedMax;
}

bool HTMLTextAreaElement::isValidValue(const String& candidate) const
{
    return !valueMissing(candidate) && !tooShort(candidate, IgnoreDirtyFlag) && !tooLong(candidate, IgnoreDirtyFlag);
}

void HTMLTextAreaElement::accessKeyAction(bool)
{
    focus();
}

void HTMLTextAreaElement::setCols(unsigned cols)
{
    setUnsignedIntegralAttribute(colsAttr, limitToOnlyHTMLNonNegativeNumbersGreaterThanZero(cols, defaultCols));
}

void HTMLTextAreaElement::setRows(unsigned rows)
{
    setUnsignedIntegralAttribute(rowsAttr, limitToOnlyHTMLNonNegativeNumbersGreaterThanZero(rows, defaultRows));
}

bool HTMLTextAreaElement::shouldUseInputMethod()
{
    return true;
}

HTMLElement* HTMLTextAreaElement::placeholderElement() const
{
    return m_placeholder.get();
}

bool HTMLTextAreaElement::matchesReadWritePseudoClass() const
{
    return !isDisabledOrReadOnly();
}

void HTMLTextAreaElement::updatePlaceholderText()
{
    String placeholderText = strippedPlaceholder();
    if (placeholderText.isEmpty()) {
        if (m_placeholder) {
            userAgentShadowRoot()->removeChild(*m_placeholder);
            m_placeholder = nullptr;
        }
        return;
    }
    if (!m_placeholder) {
        m_placeholder = TextControlPlaceholderElement::create(document());
        userAgentShadowRoot()->insertBefore(*m_placeholder, innerTextElement()->nextSibling());
    }
    m_placeholder->setInnerText(placeholderText);
}

bool HTMLTextAreaElement::willRespondToMouseClickEvents()
{
    return !isDisabledFormControl();
}

RenderStyle HTMLTextAreaElement::createInnerTextStyle(const RenderStyle& style)
{
    auto textBlockStyle = RenderStyle::create();
    textBlockStyle.inheritFrom(style);
    adjustInnerTextStyle(style, textBlockStyle);
    textBlockStyle.setDisplay(DisplayType::Block);
    return textBlockStyle;
}

void HTMLTextAreaElement::copyNonAttributePropertiesFromElement(const Element& source)
{
    auto& sourceElement = downcast<HTMLTextAreaElement>(source);

    setValueCommon(sourceElement.value());
    m_isDirty = sourceElement.m_isDirty;
    HTMLTextFormControlElement::copyNonAttributePropertiesFromElement(source);

    updateValidity();
}

} // namespace WebCore