summaryrefslogtreecommitdiff
path: root/layout/style/ErrorReporter.cpp
blob: 56a84da3eaee521784df73ef632b161ec52efb62 (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
/* -*- Mode: C++; tab-width: 2; 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/. */

/* diagnostic reporting for CSS style sheet parser */

#include "mozilla/css/ErrorReporter.h"

#include "mozilla/StyleSheetInlines.h"
#include "mozilla/css/Loader.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.h"
#include "nsCSSScanner.h"
#include "nsIConsoleService.h"
#include "nsIDocument.h"
#include "nsIFactory.h"
#include "nsIScriptError.h"
#include "nsIStringBundle.h"
#include "nsServiceManagerUtils.h"
#include "nsStyleUtil.h"
#include "nsThreadUtils.h"

#ifdef CSS_REPORT_PARSE_ERRORS

using namespace mozilla;

namespace {
class ShortTermURISpecCache : public Runnable {
public:
  ShortTermURISpecCache() : mPending(false) {}

  nsString const& GetSpec(nsIURI* aURI) {
    if (mURI != aURI) {
      mURI = aURI;

      nsAutoCString cSpec;
      nsresult rv = mURI->GetSpec(cSpec);
      if (NS_FAILED(rv)) {
        cSpec.AssignLiteral("[nsIURI::GetSpec failed]");
      }
      CopyUTF8toUTF16(cSpec, mSpec);
    }
    return mSpec;
  }

  bool IsInUse() const { return mURI != nullptr; }
  bool IsPending() const { return mPending; }
  void SetPending() { mPending = true; }

  // When invoked as a runnable, zap the cache.
  NS_IMETHOD Run() override {
    mURI = nullptr;
    mSpec.Truncate();
    mPending = false;
    return NS_OK;
  }

private:
  nsCOMPtr<nsIURI> mURI;
  nsString mSpec;
  bool mPending;
};

} // namespace

static bool sReportErrors;
static nsIConsoleService *sConsoleService;
static nsIFactory *sScriptErrorFactory;
static nsIStringBundle *sStringBundle;
static ShortTermURISpecCache *sSpecCache;

#define CSS_ERRORS_PREF "layout.css.report_errors"

static bool
InitGlobals()
{
  MOZ_ASSERT(!sConsoleService && !sScriptErrorFactory && !sStringBundle,
             "should not have been called");

  if (NS_FAILED(Preferences::AddBoolVarCache(&sReportErrors, CSS_ERRORS_PREF,
                                             true))) {
    return false;
  }

  nsCOMPtr<nsIConsoleService> cs = do_GetService(NS_CONSOLESERVICE_CONTRACTID);
  if (!cs) {
    return false;
  }

  nsCOMPtr<nsIFactory> sf = do_GetClassObject(NS_SCRIPTERROR_CONTRACTID);
  if (!sf) {
    return false;
  }

  nsCOMPtr<nsIStringBundleService> sbs = services::GetStringBundleService();
  if (!sbs) {
    return false;
  }

  nsCOMPtr<nsIStringBundle> sb;
  nsresult rv = sbs->CreateBundle("chrome://global/locale/css.properties",
                                  getter_AddRefs(sb));
  if (NS_FAILED(rv) || !sb) {
    return false;
  }

  cs.forget(&sConsoleService);
  sf.forget(&sScriptErrorFactory);
  sb.forget(&sStringBundle);

  return true;
}

static inline bool
ShouldReportErrors()
{
  if (!sConsoleService) {
    if (!InitGlobals()) {
      return false;
    }
  }
  return sReportErrors;
}

namespace mozilla {
namespace css {

/* static */ void
ErrorReporter::ReleaseGlobals()
{
  NS_IF_RELEASE(sConsoleService);
  NS_IF_RELEASE(sScriptErrorFactory);
  NS_IF_RELEASE(sStringBundle);
  NS_IF_RELEASE(sSpecCache);
}

ErrorReporter::ErrorReporter(const nsCSSScanner& aScanner,
                             const CSSStyleSheet* aSheet,
                             const Loader* aLoader,
                             nsIURI* aURI)
  : mScanner(&aScanner), mSheet(aSheet), mLoader(aLoader), mURI(aURI),
    mInnerWindowID(0), mErrorLineNumber(0), mPrevErrorLineNumber(0),
    mErrorColNumber(0)
{
}

ErrorReporter::~ErrorReporter()
{
  // Schedule deferred cleanup for cached data. We want to strike a
  // balance between performance and memory usage, so we only allow
  // short-term caching.
  if (sSpecCache && sSpecCache->IsInUse() && !sSpecCache->IsPending()) {
    if (NS_FAILED(NS_DispatchToCurrentThread(sSpecCache))) {
      // Peform the "deferred" cleanup immediately if the dispatch fails.
      sSpecCache->Run();
    } else {
      sSpecCache->SetPending();
    }
  }
}

void
ErrorReporter::OutputError()
{
  if (mError.IsEmpty()) {
    return;
  }
  if (!ShouldReportErrors()) {
    ClearError();
    return;
  }

  if (mInnerWindowID == 0 && (mSheet || mLoader)) {
    if (mSheet) {
      mInnerWindowID = mSheet->FindOwningWindowInnerID();
    }
    if (mInnerWindowID == 0 && mLoader) {
      nsIDocument* doc = mLoader->GetDocument();
      if (doc) {
        mInnerWindowID = doc->InnerWindowID();
      }
    }
    // don't attempt this again, even if we failed
    mSheet = nullptr;
    mLoader = nullptr;
  }

  if (mFileName.IsEmpty()) {
    if (mURI) {
      if (!sSpecCache) {
        sSpecCache = new ShortTermURISpecCache;
        NS_ADDREF(sSpecCache);
      }
      mFileName = sSpecCache->GetSpec(mURI);
      mURI = nullptr;
    } else {
      mFileName.AssignLiteral("from DOM");
    }
  }

  nsresult rv;
  nsCOMPtr<nsIScriptError> errorObject =
    do_CreateInstance(sScriptErrorFactory, &rv);

  if (NS_SUCCEEDED(rv)) {
    rv = errorObject->InitWithWindowID(mError,
                                       mFileName,
                                       mErrorLine,
                                       mErrorLineNumber,
                                       mErrorColNumber,
                                       nsIScriptError::warningFlag,
                                       "CSS Parser",
                                       mInnerWindowID);
    if (NS_SUCCEEDED(rv)) {
      sConsoleService->LogMessage(errorObject);
    }
  }

  ClearError();
}

void
ErrorReporter::OutputError(uint32_t aLineNumber, uint32_t aLineOffset)
{
  mErrorLineNumber = aLineNumber;
  mErrorColNumber = aLineOffset;
  OutputError();
}

void
ErrorReporter::ClearError()
{
  mError.Truncate();
}

void
ErrorReporter::AddToError(const nsString &aErrorText)
{
  if (!ShouldReportErrors()) return;

  if (mError.IsEmpty()) {
    mError = aErrorText;
    mErrorLineNumber = mScanner->GetLineNumber();
    mErrorColNumber = mScanner->GetColumnNumber();
    // Retrieve the error line once per line, and reuse the same nsString
    // for all errors on that line.  That causes the text of the line to
    // be shared among all the nsIScriptError objects.
    if (mErrorLine.IsEmpty() || mErrorLineNumber != mPrevErrorLineNumber) {
      // Be careful here: the error line might be really long and OOM
      // when we try to make a copy here.  If so, just leave it empty.
      if (!mErrorLine.Assign(mScanner->GetCurrentLine(), fallible)) {
        mErrorLine.Truncate();
      }
      mPrevErrorLineNumber = mErrorLineNumber;
    }
  } else {
    mError.AppendLiteral("  ");
    mError.Append(aErrorText);
  }
}

void
ErrorReporter::ReportUnexpected(const char *aMessage)
{
  if (!ShouldReportErrors()) return;

  nsAutoString str;
  sStringBundle->GetStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),
                                   getter_Copies(str));
  AddToError(str);
}

void
ErrorReporter::ReportUnexpected(const char *aMessage,
                                const nsString &aParam)
{
  if (!ShouldReportErrors()) return;

  nsAutoString qparam;
  nsStyleUtil::AppendEscapedCSSIdent(aParam, qparam);
  const char16_t *params[1] = { qparam.get() };

  nsAutoString str;
  sStringBundle->FormatStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),
                                      params, ArrayLength(params),
                                      getter_Copies(str));
  AddToError(str);
}

void
ErrorReporter::ReportUnexpected(const char *aMessage,
                                const nsCSSToken &aToken)
{
  if (!ShouldReportErrors()) return;

  nsAutoString tokenString;
  aToken.AppendToString(tokenString);
  const char16_t *params[1] = { tokenString.get() };

  nsAutoString str;
  sStringBundle->FormatStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),
                                      params, ArrayLength(params),
                                      getter_Copies(str));
  AddToError(str);
}

void
ErrorReporter::ReportUnexpected(const char *aMessage,
                                const nsCSSToken &aToken,
                                char16_t aChar)
{
  if (!ShouldReportErrors()) return;

  nsAutoString tokenString;
  aToken.AppendToString(tokenString);
  const char16_t charStr[2] = { aChar, 0 };
  const char16_t *params[2] = { tokenString.get(), charStr };

  nsAutoString str;
  sStringBundle->FormatStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),
                                      params, ArrayLength(params),
                                      getter_Copies(str));
  AddToError(str);
}

void
ErrorReporter::ReportUnexpected(const char *aMessage,
                                const nsString &aParam,
                                const nsString &aValue)
{
  if (!ShouldReportErrors()) return;

  nsAutoString qparam;
  nsStyleUtil::AppendEscapedCSSIdent(aParam, qparam);
  const char16_t *params[2] = { qparam.get(), aValue.get() };

  nsAutoString str;
  sStringBundle->FormatStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),
                                      params, ArrayLength(params),
                                      getter_Copies(str));
  AddToError(str);
}

void
ErrorReporter::ReportUnexpectedEOF(const char *aMessage)
{
  if (!ShouldReportErrors()) return;

  nsAutoString innerStr;
  sStringBundle->GetStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),
                                   getter_Copies(innerStr));
  const char16_t *params[1] = { innerStr.get() };

  nsAutoString str;
  sStringBundle->FormatStringFromName(u"PEUnexpEOF2",
                                      params, ArrayLength(params),
                                      getter_Copies(str));
  AddToError(str);
}

void
ErrorReporter::ReportUnexpectedEOF(char16_t aExpected)
{
  if (!ShouldReportErrors()) return;

  const char16_t expectedStr[] = {
    char16_t('\''), aExpected, char16_t('\''), char16_t(0)
  };
  const char16_t *params[1] = { expectedStr };

  nsAutoString str;
  sStringBundle->FormatStringFromName(u"PEUnexpEOF2",
                                      params, ArrayLength(params),
                                      getter_Copies(str));
  AddToError(str);
}

} // namespace css
} // namespace mozilla

#endif