DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (4a108e94d3e2)

VCS Links

Line Code
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
/* -*- 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/. */

/* base class for DOM objects for element.style and cssStyleRule.style */

#include "nsDOMCSSDeclaration.h"

#include "nsCSSParser.h"
#include "mozilla/CSSStyleSheet.h"
#include "mozilla/css/Rule.h"
#include "mozilla/css/Declaration.h"
#include "mozilla/dom/CSS2PropertiesBinding.h"
#include "nsCSSProps.h"
#include "nsCOMPtr.h"
#include "mozAutoDocUpdate.h"
#include "nsIURI.h"
#include "mozilla/dom/BindingUtils.h"
#include "nsContentUtils.h"

using namespace mozilla;

nsDOMCSSDeclaration::~nsDOMCSSDeclaration()
{
}

/* virtual */ JSObject*
nsDOMCSSDeclaration::WrapObject(JSContext* aCx)
{
  return dom::CSS2PropertiesBinding::Wrap(aCx, this);
}

NS_INTERFACE_TABLE_HEAD(nsDOMCSSDeclaration)
  NS_INTERFACE_TABLE(nsDOMCSSDeclaration,
                     nsICSSDeclaration,
                     nsIDOMCSSStyleDeclaration)
  NS_INTERFACE_TABLE_TO_MAP_SEGUE
NS_INTERFACE_MAP_END

NS_IMETHODIMP
nsDOMCSSDeclaration::GetPropertyValue(const nsCSSProperty aPropID,
                                      nsAString& aValue)
{
  NS_PRECONDITION(aPropID != eCSSProperty_UNKNOWN,
                  "Should never pass eCSSProperty_UNKNOWN around");

  css::Declaration* decl = GetCSSDeclaration(false);

  aValue.Truncate();
  if (decl) {
    decl->GetValue(aPropID, aValue);
  }
  return NS_OK;
}

void
nsDOMCSSDeclaration::GetCustomPropertyValue(const nsAString& aPropertyName,
                                            nsAString& aValue)
{
  MOZ_ASSERT(Substring(aPropertyName, 0,
                       CSS_CUSTOM_NAME_PREFIX_LENGTH).EqualsLiteral("--"));

  css::Declaration* decl = GetCSSDeclaration(false);
  if (!decl) {
    aValue.Truncate();
    return;
  }

  decl->GetVariableDeclaration(Substring(aPropertyName,
                                         CSS_CUSTOM_NAME_PREFIX_LENGTH),
                               aValue);
}

NS_IMETHODIMP
nsDOMCSSDeclaration::SetPropertyValue(const nsCSSProperty aPropID,
                                      const nsAString& aValue)
{
  if (aValue.IsEmpty()) {
    // If the new value of the property is an empty string we remove the
    // property.
    return RemoveProperty(aPropID);
  }

  return ParsePropertyValue(aPropID, aValue, false);
}


NS_IMETHODIMP
nsDOMCSSDeclaration::GetCssText(nsAString& aCssText)
{
  css::Declaration* decl = GetCSSDeclaration(false);
  aCssText.Truncate();

  if (decl) {
    decl->ToString(aCssText);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsDOMCSSDeclaration::SetCssText(const nsAString& aCssText)
{
  // We don't need to *do* anything with the old declaration, but we need
  // to ensure that it exists, or else SetCSSDeclaration may crash.
  css::Declaration* olddecl = GetCSSDeclaration(true);
  if (!olddecl) {
    return NS_ERROR_FAILURE;
  }

  CSSParsingEnvironment env;
  GetCSSParsingEnvironment(env);
  if (!env.mPrincipal) {
    return NS_ERROR_NOT_AVAILABLE;
  }

  // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
  // Attribute setting code, which leads in turn to BeginUpdate.  We
  // need to start the update now so that the old rule doesn't get used
  // between when we mutate the declaration and when we set the new
  // rule (see stack in bug 209575).
  mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);

  nsAutoPtr<css::Declaration> decl(new css::Declaration());
  decl->InitializeEmpty();
  nsCSSParser cssParser(env.mCSSLoader);
  bool changed;
  nsresult result = cssParser.ParseDeclarations(aCssText, env.mSheetURI,
                                                env.mBaseURI,
                                                env.mPrincipal, decl, &changed);
  if (NS_FAILED(result) || !changed) {
    return result;
  }

  return SetCSSDeclaration(decl.forget());
}

NS_IMETHODIMP
nsDOMCSSDeclaration::GetLength(uint32_t* aLength)
{
  css::Declaration* decl = GetCSSDeclaration(false);

  if (decl) {
    *aLength = decl->Count();
  } else {
    *aLength = 0;
  }

  return NS_OK;
}

already_AddRefed<dom::CSSValue>
nsDOMCSSDeclaration::GetPropertyCSSValue(const nsAString& aPropertyName, ErrorResult& aRv)
{
  // We don't support CSSValue yet so we'll just return null...

  return nullptr;
}

void
nsDOMCSSDeclaration::IndexedGetter(uint32_t aIndex, bool& aFound, nsAString& aPropName)
{
  css::Declaration* decl = GetCSSDeclaration(false);
  aFound = decl && decl->GetNthProperty(aIndex, aPropName);
}

NS_IMETHODIMP
nsDOMCSSDeclaration::GetPropertyValue(const nsAString& aPropertyName,
                                      nsAString& aReturn)
{
  const nsCSSProperty propID =
    nsCSSProps::LookupProperty(aPropertyName,
                               nsCSSProps::eEnabledForAllContent);
  if (propID == eCSSProperty_UNKNOWN) {
    aReturn.Truncate();
    return NS_OK;
  }

  if (propID == eCSSPropertyExtra_variable) {
    GetCustomPropertyValue(aPropertyName, aReturn);
    return NS_OK;
  }

  return GetPropertyValue(propID, aReturn);
}

NS_IMETHODIMP
nsDOMCSSDeclaration::GetAuthoredPropertyValue(const nsAString& aPropertyName,
                                              nsAString& aReturn)
{
  const nsCSSProperty propID =
    nsCSSProps::LookupProperty(aPropertyName,
                               nsCSSProps::eEnabledForAllContent);
  if (propID == eCSSProperty_UNKNOWN) {
    aReturn.Truncate();
    return NS_OK;
  }

  if (propID == eCSSPropertyExtra_variable) {
    GetCustomPropertyValue(aPropertyName, aReturn);
    return NS_OK;
  }

  css::Declaration* decl = GetCSSDeclaration(false);
  if (!decl) {
    return NS_ERROR_FAILURE;
  }

  decl->GetAuthoredValue(propID, aReturn);
  return NS_OK;
}

NS_IMETHODIMP
nsDOMCSSDeclaration::GetPropertyPriority(const nsAString& aPropertyName,
                                         nsAString& aReturn)
{
  css::Declaration* decl = GetCSSDeclaration(false);

  aReturn.Truncate();
  if (decl && decl->GetValueIsImportant(aPropertyName)) {
    aReturn.AssignLiteral("important");
  }

  return NS_OK;
}

NS_IMETHODIMP
nsDOMCSSDeclaration::SetProperty(const nsAString& aPropertyName,
                                 const nsAString& aValue,
                                 const nsAString& aPriority)
{
  // In the common (and fast) cases we can use the property id
  nsCSSProperty propID =
    nsCSSProps::LookupProperty(aPropertyName,
                               nsCSSProps::eEnabledForAllContent);
  if (propID == eCSSProperty_UNKNOWN) {
    return NS_OK;
  }

  if (aValue.IsEmpty()) {
    // If the new value of the property is an empty string we remove the
    // property.
    // XXX this ignores the priority string, should it?
    if (propID == eCSSPropertyExtra_variable) {
      return RemoveCustomProperty(aPropertyName);
    }
    return RemoveProperty(propID);
  }

  bool important;
  if (aPriority.IsEmpty()) {
    important = false;
  } else if (aPriority.EqualsLiteral("important")) {
    important = true;
  } else {
    // XXX silent failure?
    return NS_OK;
  }

  if (propID == eCSSPropertyExtra_variable) {
    return ParseCustomPropertyValue(aPropertyName, aValue, important);
  }
  return ParsePropertyValue(propID, aValue, important);
}

NS_IMETHODIMP
nsDOMCSSDeclaration::RemoveProperty(const nsAString& aPropertyName,
                                    nsAString& aReturn)
{
  const nsCSSProperty propID =
    nsCSSProps::LookupProperty(aPropertyName,
                               nsCSSProps::eEnabledForAllContent);
  if (propID == eCSSProperty_UNKNOWN) {
    aReturn.Truncate();
    return NS_OK;
  }

  if (propID == eCSSPropertyExtra_variable) {
    RemoveCustomProperty(aPropertyName);
    return NS_OK;
  }

  nsresult rv = GetPropertyValue(propID, aReturn);
  NS_ENSURE_SUCCESS(rv, rv);

  return RemoveProperty(propID);
}

/* static */ void
nsDOMCSSDeclaration::GetCSSParsingEnvironmentForRule(css::Rule* aRule,
                                                     CSSParsingEnvironment& aCSSParseEnv)
{
  nsIStyleSheet* sheet = aRule ? aRule->GetStyleSheet() : nullptr;
  nsRefPtr<CSSStyleSheet> cssSheet(do_QueryObject(sheet));
  if (!cssSheet) {
    aCSSParseEnv.mPrincipal = nullptr;
    return;
  }

  nsIDocument* document = sheet->GetOwningDocument();
  aCSSParseEnv.mSheetURI = sheet->GetSheetURI();
  aCSSParseEnv.mBaseURI = sheet->GetBaseURI();
  aCSSParseEnv.mPrincipal = cssSheet->Principal();
  aCSSParseEnv.mCSSLoader = document ? document->CSSLoader() : nullptr;
}

nsresult
nsDOMCSSDeclaration::ParsePropertyValue(const nsCSSProperty aPropID,
                                        const nsAString& aPropValue,
                                        bool aIsImportant)
{
  css::Declaration* olddecl = GetCSSDeclaration(true);
  if (!olddecl) {
    return NS_ERROR_FAILURE;
  }

  CSSParsingEnvironment env;
  GetCSSParsingEnvironment(env);
  if (!env.mPrincipal) {
    return NS_ERROR_NOT_AVAILABLE;
  }

  // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
  // Attribute setting code, which leads in turn to BeginUpdate.  We
  // need to start the update now so that the old rule doesn't get used
  // between when we mutate the declaration and when we set the new
  // rule (see stack in bug 209575).
  mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
  css::Declaration* decl = olddecl->EnsureMutable();

  nsCSSParser cssParser(env.mCSSLoader);
  bool changed;
  nsresult result = cssParser.ParseProperty(aPropID, aPropValue, env.mSheetURI,
                                            env.mBaseURI, env.mPrincipal, decl,
                                            &changed, aIsImportant);
  if (NS_FAILED(result) || !changed) {
    if (decl != olddecl) {
      delete decl;
    }
    return result;
  }

  return SetCSSDeclaration(decl);
}

nsresult
nsDOMCSSDeclaration::ParseCustomPropertyValue(const nsAString& aPropertyName,
                                              const nsAString& aPropValue,
                                              bool aIsImportant)
{
  MOZ_ASSERT(nsCSSProps::IsCustomPropertyName(aPropertyName));

  css::Declaration* olddecl = GetCSSDeclaration(true);
  if (!olddecl) {
    return NS_ERROR_FAILURE;
  }

  CSSParsingEnvironment env;
  GetCSSParsingEnvironment(env);
  if (!env.mPrincipal) {
    return NS_ERROR_NOT_AVAILABLE;
  }

  // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
  // Attribute setting code, which leads in turn to BeginUpdate.  We
  // need to start the update now so that the old rule doesn't get used
  // between when we mutate the declaration and when we set the new
  // rule (see stack in bug 209575).
  mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
  css::Declaration* decl = olddecl->EnsureMutable();

  nsCSSParser cssParser(env.mCSSLoader);
  bool changed;
  nsresult result =
    cssParser.ParseVariable(Substring(aPropertyName,
                                      CSS_CUSTOM_NAME_PREFIX_LENGTH),
                            aPropValue, env.mSheetURI,
                            env.mBaseURI, env.mPrincipal, decl,
                            &changed, aIsImportant);
  if (NS_FAILED(result) || !changed) {
    if (decl != olddecl) {
      delete decl;
    }
    return result;
  }

  return SetCSSDeclaration(decl);
}

nsresult
nsDOMCSSDeclaration::RemoveProperty(const nsCSSProperty aPropID)
{
  css::Declaration* decl = GetCSSDeclaration(false);
  if (!decl) {
    return NS_OK; // no decl, so nothing to remove
  }

  // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
  // Attribute setting code, which leads in turn to BeginUpdate.  We
  // need to start the update now so that the old rule doesn't get used
  // between when we mutate the declaration and when we set the new
  // rule (see stack in bug 209575).
  mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);

  decl = decl->EnsureMutable();
  decl->RemoveProperty(aPropID);
  return SetCSSDeclaration(decl);
}

nsresult
nsDOMCSSDeclaration::RemoveCustomProperty(const nsAString& aPropertyName)
{
  MOZ_ASSERT(Substring(aPropertyName, 0,
                       CSS_CUSTOM_NAME_PREFIX_LENGTH).EqualsLiteral("--"));

  css::Declaration* decl = GetCSSDeclaration(false);
  if (!decl) {
    return NS_OK; // no decl, so nothing to remove
  }

  // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
  // Attribute setting code, which leads in turn to BeginUpdate.  We
  // need to start the update now so that the old rule doesn't get used
  // between when we mutate the declaration and when we set the new
  // rule (see stack in bug 209575).
  mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);

  decl = decl->EnsureMutable();
  decl->RemoveVariableDeclaration(Substring(aPropertyName,
                                            CSS_CUSTOM_NAME_PREFIX_LENGTH));
  return SetCSSDeclaration(decl);
}

bool IsCSSPropertyExposedToJS(nsCSSProperty aProperty, JSContext* cx, JSObject* obj)
{
  nsCSSProps::EnabledState enabledState = nsCSSProps::eEnabledForAllContent;

  // Optimization: we skip checking properties of the JSContext
  // in the majority case where the property does not have the
  // CSS_PROPERTY_ALWAYS_ENABLED_IN_PRIVILEGED_CONTENT flag.
  bool isEnabledInChromeOrCertifiedApp
    = nsCSSProps::PropHasFlags(aProperty,
                               CSS_PROPERTY_ALWAYS_ENABLED_IN_CHROME_OR_CERTIFIED_APP);

  if (isEnabledInChromeOrCertifiedApp) {
    if (dom::IsInCertifiedApp(cx, obj) ||
        nsContentUtils::ThreadsafeIsCallerChrome())
    {
      enabledState |= nsCSSProps::eEnabledInChromeOrCertifiedApp;
    }
  }
  return nsCSSProps::IsEnabled(aProperty, enabledState);
}