summaryrefslogtreecommitdiffstats
path: root/layout/base/nsStyleSheetService.cpp
blob: 722a82ed4191004134a73dbba3c8a14ac6d98c63 (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
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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 interface for managing user and user-agent style sheets */

#include "nsStyleSheetService.h"
#include "mozilla/CSSStyleSheet.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/Unused.h"
#include "mozilla/css/Loader.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/ipc/URIUtils.h"
#include "nsIURI.h"
#include "nsCOMPtr.h"
#include "nsICategoryManager.h"
#include "nsISupportsPrimitives.h"
#include "nsISimpleEnumerator.h"
#include "nsNetUtil.h"
#include "nsIConsoleService.h"
#include "nsIObserverService.h"
#include "nsLayoutStatics.h"

using namespace mozilla;

nsStyleSheetService *nsStyleSheetService::gInstance = nullptr;

nsStyleSheetService::nsStyleSheetService()
{
  static_assert(0 == AGENT_SHEET && 1 == USER_SHEET && 2 == AUTHOR_SHEET,
                "Convention for Style Sheet");
  NS_ASSERTION(!gInstance, "Someone is using CreateInstance instead of GetService");
  gInstance = this;
  nsLayoutStatics::AddRef();
}

nsStyleSheetService::~nsStyleSheetService()
{
  UnregisterWeakMemoryReporter(this);

  gInstance = nullptr;
  nsLayoutStatics::Release();
}

NS_IMPL_ISUPPORTS(
  nsStyleSheetService, nsIStyleSheetService, nsIMemoryReporter)

void
nsStyleSheetService::RegisterFromEnumerator(nsICategoryManager  *aManager,
                                            const char          *aCategory,
                                            nsISimpleEnumerator *aEnumerator,
                                            uint32_t             aSheetType)
{
  if (!aEnumerator)
    return;

  bool hasMore;
  while (NS_SUCCEEDED(aEnumerator->HasMoreElements(&hasMore)) && hasMore) {
    nsCOMPtr<nsISupports> element;
    if (NS_FAILED(aEnumerator->GetNext(getter_AddRefs(element))))
      break;

    nsCOMPtr<nsISupportsCString> icStr = do_QueryInterface(element);
    NS_ASSERTION(icStr,
                 "category manager entries must be nsISupportsCStrings");

    nsAutoCString name;
    icStr->GetData(name);

    nsXPIDLCString spec;
    aManager->GetCategoryEntry(aCategory, name.get(), getter_Copies(spec));

    nsCOMPtr<nsIURI> uri;
    NS_NewURI(getter_AddRefs(uri), spec);
    if (uri)
      LoadAndRegisterSheetInternal(uri, aSheetType);
  }
}

int32_t
nsStyleSheetService::FindSheetByURI(const nsTArray<RefPtr<StyleSheet>>& aSheets,
                                    nsIURI* aSheetURI)
{
  for (int32_t i = aSheets.Length() - 1; i >= 0; i-- ) {
    bool bEqual;
    nsIURI* uri = aSheets[i]->GetSheetURI();
    if (uri
        && NS_SUCCEEDED(uri->Equals(aSheetURI, &bEqual))
        && bEqual) {
      return i;
    }
  }

  return -1;
}

nsresult
nsStyleSheetService::Init()
{
  // If you make changes here, consider whether
  // SVGDocument::EnsureNonSVGUserAgentStyleSheetsLoaded should be updated too.

  // Child processes get their style sheets from the ContentParent.
  if (XRE_IsContentProcess()) {
    return NS_OK;
  }

  // Enumerate all of the style sheet URIs registered in the category
  // manager and load them.

  nsCOMPtr<nsICategoryManager> catMan =
    do_GetService(NS_CATEGORYMANAGER_CONTRACTID);

  NS_ENSURE_TRUE(catMan, NS_ERROR_OUT_OF_MEMORY);

  nsCOMPtr<nsISimpleEnumerator> sheets;
  catMan->EnumerateCategory("agent-style-sheets", getter_AddRefs(sheets));
  RegisterFromEnumerator(catMan, "agent-style-sheets", sheets, AGENT_SHEET);

  catMan->EnumerateCategory("user-style-sheets", getter_AddRefs(sheets));
  RegisterFromEnumerator(catMan, "user-style-sheets", sheets, USER_SHEET);

  catMan->EnumerateCategory("author-style-sheets", getter_AddRefs(sheets));
  RegisterFromEnumerator(catMan, "author-style-sheets", sheets, AUTHOR_SHEET);

  RegisterWeakMemoryReporter(this);

  return NS_OK;
}

NS_IMETHODIMP
nsStyleSheetService::LoadAndRegisterSheet(nsIURI *aSheetURI,
                                          uint32_t aSheetType)
{
  // Warn developers if their stylesheet URL has a #ref at the end.
  // Stylesheet URIs don't benefit from having a #ref suffix -- and if the
  // sheet is a data URI, someone might've created this #ref by accident (and
  // truncated their data-URI stylesheet) by using an unescaped # character in
  // a #RRGGBB color or #foo() ID-selector in their data-URI representation.
  bool hasRef;
  nsresult rv = aSheetURI->GetHasRef(&hasRef);
  NS_ENSURE_SUCCESS(rv, rv);
  if (aSheetURI && hasRef) {
    nsCOMPtr<nsIConsoleService> consoleService =
      do_GetService(NS_CONSOLESERVICE_CONTRACTID);
    NS_WARNING_ASSERTION(consoleService, "Failed to get console service!");
    if (consoleService) {
      const char16_t* message = u"nsStyleSheetService::LoadAndRegisterSheet: "
        u"URI contains unescaped hash character, which might be truncating "
        u"the sheet, if it's a data URI.";
      consoleService->LogStringMessage(message);
    }
  }

  rv = LoadAndRegisterSheetInternal(aSheetURI, aSheetType);
  if (NS_SUCCEEDED(rv)) {
    const char* message;
    switch (aSheetType) {
      case AGENT_SHEET:
        message = "agent-sheet-added";
        break;
      case USER_SHEET:
        message = "user-sheet-added";
        break;
      case AUTHOR_SHEET:
        message = "author-sheet-added";
        break;
      default:
        return NS_ERROR_INVALID_ARG;
    }
    nsCOMPtr<nsIObserverService> serv = services::GetObserverService();
    if (serv) {
      // We're guaranteed that the new sheet is the last sheet in
      // mSheets[aSheetType]

      // XXXheycam Once the nsStyleSheetService can hold ServoStyleSheets too,
      // we'll need to include them in the notification.
      StyleSheet* sheet = mSheets[aSheetType].LastElement();
      if (sheet->IsGecko()) {
        CSSStyleSheet* cssSheet = sheet->AsGecko();
        serv->NotifyObservers(NS_ISUPPORTS_CAST(nsIDOMCSSStyleSheet*, cssSheet),
                              message, nullptr);
      } else {
        NS_ERROR("stylo: can't notify observers of ServoStyleSheets");
      }
    }

    if (XRE_IsParentProcess()) {
      nsTArray<dom::ContentParent*> children;
      dom::ContentParent::GetAll(children);

      if (children.IsEmpty()) {
        return rv;
      }

      mozilla::ipc::URIParams uri;
      SerializeURI(aSheetURI, uri);

      for (uint32_t i = 0; i < children.Length(); i++) {
        Unused << children[i]->SendLoadAndRegisterSheet(uri, aSheetType);
      }
    }
  }
  return rv;
}

nsresult
nsStyleSheetService::LoadAndRegisterSheetInternal(nsIURI *aSheetURI,
                                                  uint32_t aSheetType)
{
  NS_ENSURE_ARG_POINTER(aSheetURI);

  css::SheetParsingMode parsingMode;
  switch (aSheetType) {
    case AGENT_SHEET:
      parsingMode = css::eAgentSheetFeatures;
      break;

    case USER_SHEET:
      parsingMode = css::eUserSheetFeatures;
      break;

    case AUTHOR_SHEET:
      parsingMode = css::eAuthorSheetFeatures;
      break;

    default:
      NS_WARNING("invalid sheet type argument");
      return NS_ERROR_INVALID_ARG;
  }

  // XXXheycam We'll need to load and register both a Gecko- and Servo-backed
  // style sheet.
  RefPtr<css::Loader> loader = new css::Loader(StyleBackendType::Gecko);

  RefPtr<StyleSheet> sheet;
  nsresult rv = loader->LoadSheetSync(aSheetURI, parsingMode, true, &sheet);
  NS_ENSURE_SUCCESS(rv, rv);

  mSheets[aSheetType].AppendElement(sheet);

  return rv;
}

NS_IMETHODIMP
nsStyleSheetService::SheetRegistered(nsIURI *sheetURI,
                                     uint32_t aSheetType, bool *_retval)
{
  NS_ENSURE_ARG(aSheetType == AGENT_SHEET ||
                aSheetType == USER_SHEET ||
                aSheetType == AUTHOR_SHEET);
  NS_ENSURE_ARG_POINTER(sheetURI);
  NS_PRECONDITION(_retval, "Null out param");

  *_retval = (FindSheetByURI(mSheets[aSheetType], sheetURI) >= 0);

  return NS_OK;
}

NS_IMETHODIMP
nsStyleSheetService::PreloadSheet(nsIURI *aSheetURI, uint32_t aSheetType,
                                  nsIDOMStyleSheet **aSheet)
{
  NS_PRECONDITION(aSheet, "Null out param");
  NS_ENSURE_ARG_POINTER(aSheetURI);
  css::SheetParsingMode parsingMode;
  switch (aSheetType) {
    case AGENT_SHEET:
      parsingMode = css::eAgentSheetFeatures;
      break;

    case USER_SHEET:
      parsingMode = css::eUserSheetFeatures;
      break;

    case AUTHOR_SHEET:
      parsingMode = css::eAuthorSheetFeatures;
      break;

    default:
      NS_WARNING("invalid sheet type argument");
      return NS_ERROR_INVALID_ARG;
  }

  // XXXheycam PreloadSheet can't support ServoStyleSheets until they implement
  // nsIDOMStyleSheet.

  RefPtr<css::Loader> loader = new css::Loader(StyleBackendType::Gecko);

  RefPtr<StyleSheet> sheet;
  nsresult rv = loader->LoadSheetSync(aSheetURI, parsingMode, true, &sheet);
  NS_ENSURE_SUCCESS(rv, rv);

  MOZ_ASSERT(sheet->IsGecko(),
             "stylo: didn't expect Loader to create a ServoStyleSheet");

  RefPtr<CSSStyleSheet> cssSheet = sheet->AsGecko();
  cssSheet.forget(aSheet);

  return NS_OK;
}

NS_IMETHODIMP
nsStyleSheetService::UnregisterSheet(nsIURI *aSheetURI, uint32_t aSheetType)
{
  NS_ENSURE_ARG(aSheetType == AGENT_SHEET ||
                aSheetType == USER_SHEET ||
                aSheetType == AUTHOR_SHEET);
  NS_ENSURE_ARG_POINTER(aSheetURI);

  int32_t foundIndex = FindSheetByURI(mSheets[aSheetType], aSheetURI);
  NS_ENSURE_TRUE(foundIndex >= 0, NS_ERROR_INVALID_ARG);
  RefPtr<StyleSheet> sheet = mSheets[aSheetType][foundIndex];
  mSheets[aSheetType].RemoveElementAt(foundIndex);

  const char* message;
  switch (aSheetType) {
    case AGENT_SHEET:
      message = "agent-sheet-removed";
      break;
    case USER_SHEET:
      message = "user-sheet-removed";
      break;
    case AUTHOR_SHEET:
      message = "author-sheet-removed";
      break;
  }

  nsCOMPtr<nsIObserverService> serv = services::GetObserverService();
  if (serv) {
    // XXXheycam Once the nsStyleSheetService can hold ServoStyleSheets too,
    // we'll need to include them in the notification.
    if (sheet->IsGecko()) {
      CSSStyleSheet* cssSheet = sheet->AsGecko();
      serv->NotifyObservers(NS_ISUPPORTS_CAST(nsIDOMCSSStyleSheet*, cssSheet),
                            message, nullptr);
    } else {
      NS_ERROR("stylo: can't notify observers of ServoStyleSheets");
    }
  }

  if (XRE_IsParentProcess()) {
    nsTArray<dom::ContentParent*> children;
    dom::ContentParent::GetAll(children);

    if (children.IsEmpty()) {
      return NS_OK;
    }

    mozilla::ipc::URIParams uri;
    SerializeURI(aSheetURI, uri);

    for (uint32_t i = 0; i < children.Length(); i++) {
      Unused << children[i]->SendUnregisterSheet(uri, aSheetType);
    }
  }

  return NS_OK;
}

//static
nsStyleSheetService *
nsStyleSheetService::GetInstance()
{
  static bool first = true;
  if (first) {
    // make sure at first call that it's inited
    nsCOMPtr<nsIStyleSheetService> dummy =
      do_GetService(NS_STYLESHEETSERVICE_CONTRACTID);
    first = false;
  }

  return gInstance;
}

MOZ_DEFINE_MALLOC_SIZE_OF(StyleSheetServiceMallocSizeOf)

NS_IMETHODIMP
nsStyleSheetService::CollectReports(nsIHandleReportCallback* aHandleReport,
                                    nsISupports* aData, bool aAnonymize)
{
  MOZ_COLLECT_REPORT(
    "explicit/layout/style-sheet-service", KIND_HEAP, UNITS_BYTES,
    SizeOfIncludingThis(StyleSheetServiceMallocSizeOf),
    "Memory used for style sheets held by the style sheet service.");

  return NS_OK;
}

size_t
nsStyleSheetService::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
  size_t n = aMallocSizeOf(this);
  for (auto& sheetArray : mSheets) {
    n += sheetArray.ShallowSizeOfExcludingThis(aMallocSizeOf);
    for (StyleSheet* sheet : sheetArray) {
      n += sheet->SizeOfIncludingThis(aMallocSizeOf);
    }
  }
  return n;
}