summaryrefslogtreecommitdiffstats
path: root/dom/base/nsDOMTokenList.cpp
blob: f9ebef2884c4c15b9ee259b12957dfbbdcaf015f (plain)
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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * Implementation of DOMTokenList specified by HTML5.
 */

#include "nsDOMTokenList.h"
#include "nsAttrValue.h"
#include "nsAttrValueInlines.h"
#include "nsTHashMap.h"
#include "nsError.h"
#include "nsHashKeys.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/DOMTokenListBinding.h"
#include "mozilla/ErrorResult.h"

using namespace mozilla;
using namespace mozilla::dom;

nsDOMTokenList::nsDOMTokenList(
    Element* aElement, nsAtom* aAttrAtom,
    const DOMTokenListSupportedTokenArray aSupportedTokens)
    : mElement(aElement),
      mAttrAtom(aAttrAtom),
      mSupportedTokens(aSupportedTokens) {
  // We don't add a reference to our element. If it goes away,
  // we'll be told to drop our reference
}

nsDOMTokenList::~nsDOMTokenList() = default;

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(nsDOMTokenList, mElement)

NS_INTERFACE_MAP_BEGIN(nsDOMTokenList)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  NS_INTERFACE_MAP_ENTRY(nsISupports)
  NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(nsDOMTokenList)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMTokenList)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMTokenList)

const nsAttrValue* nsDOMTokenList::GetParsedAttr() {
  if (!mElement) {
    return nullptr;
  }
  return mElement->GetAttrInfo(kNameSpaceID_None, mAttrAtom).mValue;
}

static void RemoveDuplicates(const nsAttrValue* aAttr) {
  if (!aAttr || aAttr->Type() != nsAttrValue::eAtomArray) {
    return;
  }
  aAttr->GetAtomArrayValue()->RemoveDuplicates();
}

uint32_t nsDOMTokenList::Length() {
  const nsAttrValue* attr = GetParsedAttr();
  if (!attr) {
    return 0;
  }

  RemoveDuplicates(attr);
  return attr->GetAtomCount();
}

void nsDOMTokenList::IndexedGetter(uint32_t aIndex, bool& aFound,
                                   nsAString& aResult) {
  const nsAttrValue* attr = GetParsedAttr();

  if (!attr || aIndex >= static_cast<uint32_t>(attr->GetAtomCount())) {
    aFound = false;
    return;
  }

  RemoveDuplicates(attr);

  if (attr && aIndex < static_cast<uint32_t>(attr->GetAtomCount())) {
    aFound = true;
    attr->AtomAt(aIndex)->ToString(aResult);
  } else {
    aFound = false;
  }
}

void nsDOMTokenList::GetValue(nsAString& aResult) {
  if (!mElement) {
    aResult.Truncate();
    return;
  }

  mElement->GetAttr(kNameSpaceID_None, mAttrAtom, aResult);
}

void nsDOMTokenList::SetValue(const nsAString& aValue, ErrorResult& rv) {
  if (!mElement) {
    return;
  }

  rv = mElement->SetAttr(kNameSpaceID_None, mAttrAtom, aValue, true);
}

void nsDOMTokenList::CheckToken(const nsAString& aToken, ErrorResult& aRv) {
  if (aToken.IsEmpty()) {
    return aRv.ThrowSyntaxError("The empty string is not a valid token.");
  }

  nsAString::const_iterator iter, end;
  aToken.BeginReading(iter);
  aToken.EndReading(end);

  while (iter != end) {
    if (nsContentUtils::IsHTMLWhitespace(*iter)) {
      return aRv.ThrowInvalidCharacterError(
          "The token can not contain whitespace.");
    }
    ++iter;
  }
}

void nsDOMTokenList::CheckTokens(const nsTArray<nsString>& aTokens,
                                 ErrorResult& aRv) {
  for (uint32_t i = 0, l = aTokens.Length(); i < l; ++i) {
    CheckToken(aTokens[i], aRv);
    if (aRv.Failed()) {
      return;
    }
  }
}

bool nsDOMTokenList::Contains(const nsAString& aToken) {
  const nsAttrValue* attr = GetParsedAttr();
  return attr && attr->Contains(aToken);
}

void nsDOMTokenList::AddInternal(const nsAttrValue* aAttr,
                                 const nsTArray<nsString>& aTokens) {
  if (!mElement) {
    return;
  }

  nsAutoString resultStr;

  if (aAttr) {
    RemoveDuplicates(aAttr);
    for (uint32_t i = 0; i < aAttr->GetAtomCount(); i++) {
      if (i != 0) {
        resultStr.AppendLiteral(" ");
      }
      resultStr.Append(nsDependentAtomString(aAttr->AtomAt(i)));
    }
  }

  AutoTArray<nsString, 10> addedClasses;

  for (uint32_t i = 0, l = aTokens.Length(); i < l; ++i) {
    const nsString& aToken = aTokens[i];

    if ((aAttr && aAttr->Contains(aToken)) || addedClasses.Contains(aToken)) {
      continue;
    }

    if (!resultStr.IsEmpty()) {
      resultStr.Append(' ');
    }
    resultStr.Append(aToken);

    addedClasses.AppendElement(aToken);
  }

  mElement->SetAttr(kNameSpaceID_None, mAttrAtom, resultStr, true);
}

void nsDOMTokenList::Add(const nsTArray<nsString>& aTokens,
                         ErrorResult& aError) {
  CheckTokens(aTokens, aError);
  if (aError.Failed()) {
    return;
  }

  const nsAttrValue* attr = GetParsedAttr();
  AddInternal(attr, aTokens);
}

void nsDOMTokenList::Add(const nsAString& aToken, ErrorResult& aError) {
  AutoTArray<nsString, 1> tokens;
  tokens.AppendElement(aToken);
  Add(tokens, aError);
}

void nsDOMTokenList::RemoveInternal(const nsAttrValue* aAttr,
                                    const nsTArray<nsString>& aTokens) {
  MOZ_ASSERT(aAttr, "Need an attribute");

  RemoveDuplicates(aAttr);

  nsAutoString resultStr;
  for (uint32_t i = 0; i < aAttr->GetAtomCount(); i++) {
    if (aTokens.Contains(nsDependentAtomString(aAttr->AtomAt(i)))) {
      continue;
    }
    if (!resultStr.IsEmpty()) {
      resultStr.AppendLiteral(" ");
    }
    resultStr.Append(nsDependentAtomString(aAttr->AtomAt(i)));
  }

  mElement->SetAttr(kNameSpaceID_None, mAttrAtom, resultStr, true);
}

void nsDOMTokenList::Remove(const nsTArray<nsString>& aTokens,
                            ErrorResult& aError) {
  CheckTokens(aTokens, aError);
  if (aError.Failed()) {
    return;
  }

  const nsAttrValue* attr = GetParsedAttr();
  if (!attr) {
    return;
  }

  RemoveInternal(attr, aTokens);
}

void nsDOMTokenList::Remove(const nsAString& aToken, ErrorResult& aError) {
  AutoTArray<nsString, 1> tokens;
  tokens.AppendElement(aToken);
  Remove(tokens, aError);
}

bool nsDOMTokenList::Toggle(const nsAString& aToken,
                            const Optional<bool>& aForce, ErrorResult& aError) {
  CheckToken(aToken, aError);
  if (aError.Failed()) {
    return false;
  }

  const nsAttrValue* attr = GetParsedAttr();
  const bool forceOn = aForce.WasPassed() && aForce.Value();
  const bool forceOff = aForce.WasPassed() && !aForce.Value();

  bool isPresent = attr && attr->Contains(aToken);
  AutoTArray<nsString, 1> tokens;
  (*tokens.AppendElement()).Rebind(aToken.Data(), aToken.Length());

  if (isPresent) {
    if (!forceOn) {
      RemoveInternal(attr, tokens);
      isPresent = false;
    }
  } else {
    if (!forceOff) {
      AddInternal(attr, tokens);
      isPresent = true;
    }
  }

  return isPresent;
}

bool nsDOMTokenList::Replace(const nsAString& aToken,
                             const nsAString& aNewToken, ErrorResult& aError) {
  // Doing this here instead of using `CheckToken` because if aToken had invalid
  // characters, and aNewToken is empty, the returned error should be a
  // SyntaxError, not an InvalidCharacterError.
  if (aNewToken.IsEmpty()) {
    aError.ThrowSyntaxError("The empty string is not a valid token.");
    return false;
  }

  CheckToken(aToken, aError);
  if (aError.Failed()) {
    return false;
  }

  CheckToken(aNewToken, aError);
  if (aError.Failed()) {
    return false;
  }

  const nsAttrValue* attr = GetParsedAttr();
  if (!attr) {
    return false;
  }

  return ReplaceInternal(attr, aToken, aNewToken);
}

bool nsDOMTokenList::ReplaceInternal(const nsAttrValue* aAttr,
                                     const nsAString& aToken,
                                     const nsAString& aNewToken) {
  RemoveDuplicates(aAttr);

  // Trying to do a single pass here leads to really complicated code.  Just do
  // the simple thing.
  bool haveOld = false;
  for (uint32_t i = 0; i < aAttr->GetAtomCount(); ++i) {
    if (aAttr->AtomAt(i)->Equals(aToken)) {
      haveOld = true;
      break;
    }
  }
  if (!haveOld) {
    // Make sure to not touch the attribute value in this case.
    return false;
  }

  bool sawIt = false;
  nsAutoString resultStr;
  for (uint32_t i = 0; i < aAttr->GetAtomCount(); i++) {
    if (aAttr->AtomAt(i)->Equals(aToken) ||
        aAttr->AtomAt(i)->Equals(aNewToken)) {
      if (sawIt) {
        // We keep only the first
        continue;
      }
      sawIt = true;
      if (!resultStr.IsEmpty()) {
        resultStr.AppendLiteral(" ");
      }
      resultStr.Append(aNewToken);
      continue;
    }
    if (!resultStr.IsEmpty()) {
      resultStr.AppendLiteral(" ");
    }
    resultStr.Append(nsDependentAtomString(aAttr->AtomAt(i)));
  }

  MOZ_ASSERT(sawIt, "How could we not have found our token this time?");
  mElement->SetAttr(kNameSpaceID_None, mAttrAtom, resultStr, true);
  return true;
}

bool nsDOMTokenList::Supports(const nsAString& aToken, ErrorResult& aError) {
  if (!mSupportedTokens) {
    aError.ThrowTypeError<MSG_TOKENLIST_NO_SUPPORTED_TOKENS>(
        NS_ConvertUTF16toUTF8(mElement->LocalName()),
        NS_ConvertUTF16toUTF8(nsDependentAtomString(mAttrAtom)));
    return false;
  }

  for (DOMTokenListSupportedToken* supportedToken = mSupportedTokens;
       *supportedToken; ++supportedToken) {
    if (aToken.LowerCaseEqualsASCII(*supportedToken)) {
      return true;
    }
  }

  return false;
}

DocGroup* nsDOMTokenList::GetDocGroup() const {
  return mElement ? mElement->OwnerDoc()->GetDocGroup() : nullptr;
}

JSObject* nsDOMTokenList::WrapObject(JSContext* cx,
                                     JS::Handle<JSObject*> aGivenProto) {
  return DOMTokenList_Binding::Wrap(cx, this, aGivenProto);
}