1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/style/nsDOMCSSDeclaration.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,454 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/* base class for DOM objects for element.style and cssStyleRule.style */
1.10 +
1.11 +#include "nsDOMCSSDeclaration.h"
1.12 +
1.13 +#include "nsCSSParser.h"
1.14 +#include "nsCSSStyleSheet.h"
1.15 +#include "mozilla/css/Rule.h"
1.16 +#include "mozilla/css/Declaration.h"
1.17 +#include "mozilla/dom/CSS2PropertiesBinding.h"
1.18 +#include "nsCSSProps.h"
1.19 +#include "nsCOMPtr.h"
1.20 +#include "mozAutoDocUpdate.h"
1.21 +#include "nsIURI.h"
1.22 +#include "mozilla/dom/BindingUtils.h"
1.23 +#include "nsContentUtils.h"
1.24 +
1.25 +using namespace mozilla;
1.26 +
1.27 +nsDOMCSSDeclaration::~nsDOMCSSDeclaration()
1.28 +{
1.29 +}
1.30 +
1.31 +/* virtual */ JSObject*
1.32 +nsDOMCSSDeclaration::WrapObject(JSContext* aCx)
1.33 +{
1.34 + return dom::CSS2PropertiesBinding::Wrap(aCx, this);
1.35 +}
1.36 +
1.37 +NS_INTERFACE_TABLE_HEAD(nsDOMCSSDeclaration)
1.38 + NS_INTERFACE_TABLE(nsDOMCSSDeclaration,
1.39 + nsICSSDeclaration,
1.40 + nsIDOMCSSStyleDeclaration)
1.41 + NS_INTERFACE_TABLE_TO_MAP_SEGUE
1.42 +NS_INTERFACE_MAP_END
1.43 +
1.44 +NS_IMETHODIMP
1.45 +nsDOMCSSDeclaration::GetPropertyValue(const nsCSSProperty aPropID,
1.46 + nsAString& aValue)
1.47 +{
1.48 + NS_PRECONDITION(aPropID != eCSSProperty_UNKNOWN,
1.49 + "Should never pass eCSSProperty_UNKNOWN around");
1.50 +
1.51 + css::Declaration* decl = GetCSSDeclaration(false);
1.52 +
1.53 + aValue.Truncate();
1.54 + if (decl) {
1.55 + decl->GetValue(aPropID, aValue);
1.56 + }
1.57 + return NS_OK;
1.58 +}
1.59 +
1.60 +void
1.61 +nsDOMCSSDeclaration::GetCustomPropertyValue(const nsAString& aPropertyName,
1.62 + nsAString& aValue)
1.63 +{
1.64 + MOZ_ASSERT(Substring(aPropertyName, 0,
1.65 + CSS_CUSTOM_NAME_PREFIX_LENGTH).EqualsLiteral("--"));
1.66 +
1.67 + css::Declaration* decl = GetCSSDeclaration(false);
1.68 + if (!decl) {
1.69 + aValue.Truncate();
1.70 + return;
1.71 + }
1.72 +
1.73 + decl->GetVariableDeclaration(Substring(aPropertyName,
1.74 + CSS_CUSTOM_NAME_PREFIX_LENGTH),
1.75 + aValue);
1.76 +}
1.77 +
1.78 +NS_IMETHODIMP
1.79 +nsDOMCSSDeclaration::SetPropertyValue(const nsCSSProperty aPropID,
1.80 + const nsAString& aValue)
1.81 +{
1.82 + if (aValue.IsEmpty()) {
1.83 + // If the new value of the property is an empty string we remove the
1.84 + // property.
1.85 + return RemoveProperty(aPropID);
1.86 + }
1.87 +
1.88 + return ParsePropertyValue(aPropID, aValue, false);
1.89 +}
1.90 +
1.91 +
1.92 +NS_IMETHODIMP
1.93 +nsDOMCSSDeclaration::GetCssText(nsAString& aCssText)
1.94 +{
1.95 + css::Declaration* decl = GetCSSDeclaration(false);
1.96 + aCssText.Truncate();
1.97 +
1.98 + if (decl) {
1.99 + decl->ToString(aCssText);
1.100 + }
1.101 +
1.102 + return NS_OK;
1.103 +}
1.104 +
1.105 +NS_IMETHODIMP
1.106 +nsDOMCSSDeclaration::SetCssText(const nsAString& aCssText)
1.107 +{
1.108 + // We don't need to *do* anything with the old declaration, but we need
1.109 + // to ensure that it exists, or else SetCSSDeclaration may crash.
1.110 + css::Declaration* olddecl = GetCSSDeclaration(true);
1.111 + if (!olddecl) {
1.112 + return NS_ERROR_FAILURE;
1.113 + }
1.114 +
1.115 + CSSParsingEnvironment env;
1.116 + GetCSSParsingEnvironment(env);
1.117 + if (!env.mPrincipal) {
1.118 + return NS_ERROR_NOT_AVAILABLE;
1.119 + }
1.120 +
1.121 + // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
1.122 + // Attribute setting code, which leads in turn to BeginUpdate. We
1.123 + // need to start the update now so that the old rule doesn't get used
1.124 + // between when we mutate the declaration and when we set the new
1.125 + // rule (see stack in bug 209575).
1.126 + mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
1.127 +
1.128 + nsAutoPtr<css::Declaration> decl(new css::Declaration());
1.129 + decl->InitializeEmpty();
1.130 + nsCSSParser cssParser(env.mCSSLoader);
1.131 + bool changed;
1.132 + nsresult result = cssParser.ParseDeclarations(aCssText, env.mSheetURI,
1.133 + env.mBaseURI,
1.134 + env.mPrincipal, decl, &changed);
1.135 + if (NS_FAILED(result) || !changed) {
1.136 + return result;
1.137 + }
1.138 +
1.139 + return SetCSSDeclaration(decl.forget());
1.140 +}
1.141 +
1.142 +NS_IMETHODIMP
1.143 +nsDOMCSSDeclaration::GetLength(uint32_t* aLength)
1.144 +{
1.145 + css::Declaration* decl = GetCSSDeclaration(false);
1.146 +
1.147 + if (decl) {
1.148 + *aLength = decl->Count();
1.149 + } else {
1.150 + *aLength = 0;
1.151 + }
1.152 +
1.153 + return NS_OK;
1.154 +}
1.155 +
1.156 +already_AddRefed<dom::CSSValue>
1.157 +nsDOMCSSDeclaration::GetPropertyCSSValue(const nsAString& aPropertyName, ErrorResult& aRv)
1.158 +{
1.159 + // We don't support CSSValue yet so we'll just return null...
1.160 +
1.161 + return nullptr;
1.162 +}
1.163 +
1.164 +void
1.165 +nsDOMCSSDeclaration::IndexedGetter(uint32_t aIndex, bool& aFound, nsAString& aPropName)
1.166 +{
1.167 + css::Declaration* decl = GetCSSDeclaration(false);
1.168 + aFound = decl && decl->GetNthProperty(aIndex, aPropName);
1.169 +}
1.170 +
1.171 +NS_IMETHODIMP
1.172 +nsDOMCSSDeclaration::GetPropertyValue(const nsAString& aPropertyName,
1.173 + nsAString& aReturn)
1.174 +{
1.175 + const nsCSSProperty propID =
1.176 + nsCSSProps::LookupProperty(aPropertyName,
1.177 + nsCSSProps::eEnabledForAllContent);
1.178 + if (propID == eCSSProperty_UNKNOWN) {
1.179 + aReturn.Truncate();
1.180 + return NS_OK;
1.181 + }
1.182 +
1.183 + if (propID == eCSSPropertyExtra_variable) {
1.184 + GetCustomPropertyValue(aPropertyName, aReturn);
1.185 + return NS_OK;
1.186 + }
1.187 +
1.188 + return GetPropertyValue(propID, aReturn);
1.189 +}
1.190 +
1.191 +NS_IMETHODIMP
1.192 +nsDOMCSSDeclaration::GetAuthoredPropertyValue(const nsAString& aPropertyName,
1.193 + nsAString& aReturn)
1.194 +{
1.195 + const nsCSSProperty propID =
1.196 + nsCSSProps::LookupProperty(aPropertyName,
1.197 + nsCSSProps::eEnabledForAllContent);
1.198 + if (propID == eCSSProperty_UNKNOWN) {
1.199 + aReturn.Truncate();
1.200 + return NS_OK;
1.201 + }
1.202 +
1.203 + if (propID == eCSSPropertyExtra_variable) {
1.204 + GetCustomPropertyValue(aPropertyName, aReturn);
1.205 + return NS_OK;
1.206 + }
1.207 +
1.208 + css::Declaration* decl = GetCSSDeclaration(false);
1.209 + if (!decl) {
1.210 + return NS_ERROR_FAILURE;
1.211 + }
1.212 +
1.213 + decl->GetAuthoredValue(propID, aReturn);
1.214 + return NS_OK;
1.215 +}
1.216 +
1.217 +NS_IMETHODIMP
1.218 +nsDOMCSSDeclaration::GetPropertyPriority(const nsAString& aPropertyName,
1.219 + nsAString& aReturn)
1.220 +{
1.221 + css::Declaration* decl = GetCSSDeclaration(false);
1.222 +
1.223 + aReturn.Truncate();
1.224 + if (decl && decl->GetValueIsImportant(aPropertyName)) {
1.225 + aReturn.AssignLiteral("important");
1.226 + }
1.227 +
1.228 + return NS_OK;
1.229 +}
1.230 +
1.231 +NS_IMETHODIMP
1.232 +nsDOMCSSDeclaration::SetProperty(const nsAString& aPropertyName,
1.233 + const nsAString& aValue,
1.234 + const nsAString& aPriority)
1.235 +{
1.236 + // In the common (and fast) cases we can use the property id
1.237 + nsCSSProperty propID =
1.238 + nsCSSProps::LookupProperty(aPropertyName,
1.239 + nsCSSProps::eEnabledForAllContent);
1.240 + if (propID == eCSSProperty_UNKNOWN) {
1.241 + return NS_OK;
1.242 + }
1.243 +
1.244 + if (aValue.IsEmpty()) {
1.245 + // If the new value of the property is an empty string we remove the
1.246 + // property.
1.247 + // XXX this ignores the priority string, should it?
1.248 + if (propID == eCSSPropertyExtra_variable) {
1.249 + return RemoveCustomProperty(aPropertyName);
1.250 + }
1.251 + return RemoveProperty(propID);
1.252 + }
1.253 +
1.254 + bool important;
1.255 + if (aPriority.IsEmpty()) {
1.256 + important = false;
1.257 + } else if (aPriority.EqualsLiteral("important")) {
1.258 + important = true;
1.259 + } else {
1.260 + // XXX silent failure?
1.261 + return NS_OK;
1.262 + }
1.263 +
1.264 + if (propID == eCSSPropertyExtra_variable) {
1.265 + return ParseCustomPropertyValue(aPropertyName, aValue, important);
1.266 + }
1.267 + return ParsePropertyValue(propID, aValue, important);
1.268 +}
1.269 +
1.270 +NS_IMETHODIMP
1.271 +nsDOMCSSDeclaration::RemoveProperty(const nsAString& aPropertyName,
1.272 + nsAString& aReturn)
1.273 +{
1.274 + const nsCSSProperty propID =
1.275 + nsCSSProps::LookupProperty(aPropertyName,
1.276 + nsCSSProps::eEnabledForAllContent);
1.277 + if (propID == eCSSProperty_UNKNOWN) {
1.278 + aReturn.Truncate();
1.279 + return NS_OK;
1.280 + }
1.281 +
1.282 + if (propID == eCSSPropertyExtra_variable) {
1.283 + RemoveCustomProperty(aPropertyName);
1.284 + return NS_OK;
1.285 + }
1.286 +
1.287 + nsresult rv = GetPropertyValue(propID, aReturn);
1.288 + NS_ENSURE_SUCCESS(rv, rv);
1.289 +
1.290 + return RemoveProperty(propID);
1.291 +}
1.292 +
1.293 +/* static */ void
1.294 +nsDOMCSSDeclaration::GetCSSParsingEnvironmentForRule(css::Rule* aRule,
1.295 + CSSParsingEnvironment& aCSSParseEnv)
1.296 +{
1.297 + nsIStyleSheet* sheet = aRule ? aRule->GetStyleSheet() : nullptr;
1.298 + nsRefPtr<nsCSSStyleSheet> cssSheet(do_QueryObject(sheet));
1.299 + if (!cssSheet) {
1.300 + aCSSParseEnv.mPrincipal = nullptr;
1.301 + return;
1.302 + }
1.303 +
1.304 + nsIDocument* document = sheet->GetOwningDocument();
1.305 + aCSSParseEnv.mSheetURI = sheet->GetSheetURI();
1.306 + aCSSParseEnv.mBaseURI = sheet->GetBaseURI();
1.307 + aCSSParseEnv.mPrincipal = cssSheet->Principal();
1.308 + aCSSParseEnv.mCSSLoader = document ? document->CSSLoader() : nullptr;
1.309 +}
1.310 +
1.311 +nsresult
1.312 +nsDOMCSSDeclaration::ParsePropertyValue(const nsCSSProperty aPropID,
1.313 + const nsAString& aPropValue,
1.314 + bool aIsImportant)
1.315 +{
1.316 + css::Declaration* olddecl = GetCSSDeclaration(true);
1.317 + if (!olddecl) {
1.318 + return NS_ERROR_FAILURE;
1.319 + }
1.320 +
1.321 + CSSParsingEnvironment env;
1.322 + GetCSSParsingEnvironment(env);
1.323 + if (!env.mPrincipal) {
1.324 + return NS_ERROR_NOT_AVAILABLE;
1.325 + }
1.326 +
1.327 + // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
1.328 + // Attribute setting code, which leads in turn to BeginUpdate. We
1.329 + // need to start the update now so that the old rule doesn't get used
1.330 + // between when we mutate the declaration and when we set the new
1.331 + // rule (see stack in bug 209575).
1.332 + mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
1.333 + css::Declaration* decl = olddecl->EnsureMutable();
1.334 +
1.335 + nsCSSParser cssParser(env.mCSSLoader);
1.336 + bool changed;
1.337 + nsresult result = cssParser.ParseProperty(aPropID, aPropValue, env.mSheetURI,
1.338 + env.mBaseURI, env.mPrincipal, decl,
1.339 + &changed, aIsImportant);
1.340 + if (NS_FAILED(result) || !changed) {
1.341 + if (decl != olddecl) {
1.342 + delete decl;
1.343 + }
1.344 + return result;
1.345 + }
1.346 +
1.347 + return SetCSSDeclaration(decl);
1.348 +}
1.349 +
1.350 +nsresult
1.351 +nsDOMCSSDeclaration::ParseCustomPropertyValue(const nsAString& aPropertyName,
1.352 + const nsAString& aPropValue,
1.353 + bool aIsImportant)
1.354 +{
1.355 + MOZ_ASSERT(nsCSSProps::IsCustomPropertyName(aPropertyName));
1.356 +
1.357 + css::Declaration* olddecl = GetCSSDeclaration(true);
1.358 + if (!olddecl) {
1.359 + return NS_ERROR_FAILURE;
1.360 + }
1.361 +
1.362 + CSSParsingEnvironment env;
1.363 + GetCSSParsingEnvironment(env);
1.364 + if (!env.mPrincipal) {
1.365 + return NS_ERROR_NOT_AVAILABLE;
1.366 + }
1.367 +
1.368 + // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
1.369 + // Attribute setting code, which leads in turn to BeginUpdate. We
1.370 + // need to start the update now so that the old rule doesn't get used
1.371 + // between when we mutate the declaration and when we set the new
1.372 + // rule (see stack in bug 209575).
1.373 + mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
1.374 + css::Declaration* decl = olddecl->EnsureMutable();
1.375 +
1.376 + nsCSSParser cssParser(env.mCSSLoader);
1.377 + bool changed;
1.378 + nsresult result =
1.379 + cssParser.ParseVariable(Substring(aPropertyName,
1.380 + CSS_CUSTOM_NAME_PREFIX_LENGTH),
1.381 + aPropValue, env.mSheetURI,
1.382 + env.mBaseURI, env.mPrincipal, decl,
1.383 + &changed, aIsImportant);
1.384 + if (NS_FAILED(result) || !changed) {
1.385 + if (decl != olddecl) {
1.386 + delete decl;
1.387 + }
1.388 + return result;
1.389 + }
1.390 +
1.391 + return SetCSSDeclaration(decl);
1.392 +}
1.393 +
1.394 +nsresult
1.395 +nsDOMCSSDeclaration::RemoveProperty(const nsCSSProperty aPropID)
1.396 +{
1.397 + css::Declaration* decl = GetCSSDeclaration(false);
1.398 + if (!decl) {
1.399 + return NS_OK; // no decl, so nothing to remove
1.400 + }
1.401 +
1.402 + // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
1.403 + // Attribute setting code, which leads in turn to BeginUpdate. We
1.404 + // need to start the update now so that the old rule doesn't get used
1.405 + // between when we mutate the declaration and when we set the new
1.406 + // rule (see stack in bug 209575).
1.407 + mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
1.408 +
1.409 + decl = decl->EnsureMutable();
1.410 + decl->RemoveProperty(aPropID);
1.411 + return SetCSSDeclaration(decl);
1.412 +}
1.413 +
1.414 +nsresult
1.415 +nsDOMCSSDeclaration::RemoveCustomProperty(const nsAString& aPropertyName)
1.416 +{
1.417 + MOZ_ASSERT(Substring(aPropertyName, 0,
1.418 + CSS_CUSTOM_NAME_PREFIX_LENGTH).EqualsLiteral("--"));
1.419 +
1.420 + css::Declaration* decl = GetCSSDeclaration(false);
1.421 + if (!decl) {
1.422 + return NS_OK; // no decl, so nothing to remove
1.423 + }
1.424 +
1.425 + // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
1.426 + // Attribute setting code, which leads in turn to BeginUpdate. We
1.427 + // need to start the update now so that the old rule doesn't get used
1.428 + // between when we mutate the declaration and when we set the new
1.429 + // rule (see stack in bug 209575).
1.430 + mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
1.431 +
1.432 + decl = decl->EnsureMutable();
1.433 + decl->RemoveVariableDeclaration(Substring(aPropertyName,
1.434 + CSS_CUSTOM_NAME_PREFIX_LENGTH));
1.435 + return SetCSSDeclaration(decl);
1.436 +}
1.437 +
1.438 +bool IsCSSPropertyExposedToJS(nsCSSProperty aProperty, JSContext* cx, JSObject* obj)
1.439 +{
1.440 + nsCSSProps::EnabledState enabledState = nsCSSProps::eEnabledForAllContent;
1.441 +
1.442 + // Optimization: we skip checking properties of the JSContext
1.443 + // in the majority case where the property does not have the
1.444 + // CSS_PROPERTY_ALWAYS_ENABLED_IN_PRIVILEGED_CONTENT flag.
1.445 + bool isEnabledInChromeOrCertifiedApp
1.446 + = nsCSSProps::PropHasFlags(aProperty,
1.447 + CSS_PROPERTY_ALWAYS_ENABLED_IN_CHROME_OR_CERTIFIED_APP);
1.448 +
1.449 + if (isEnabledInChromeOrCertifiedApp) {
1.450 + if (dom::IsInCertifiedApp(cx, obj) ||
1.451 + nsContentUtils::ThreadsafeIsCallerChrome())
1.452 + {
1.453 + enabledState |= nsCSSProps::eEnabledInChromeOrCertifiedApp;
1.454 + }
1.455 + }
1.456 + return nsCSSProps::IsEnabled(aProperty, enabledState);
1.457 +}
