The Tor Browser: layout/style/CSS.cpp@141e0f1194b1

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /* DOM object holding utility CSS functions */

     8 #include "CSS.h"

    10 #include "mozilla/dom/BindingDeclarations.h"

    11 #include "nsCSSParser.h"

    12 #include "nsGlobalWindow.h"

    13 #include "nsIDocument.h"

    14 #include "nsIURI.h"

    15 #include "nsStyleUtil.h"

    17 namespace mozilla {

    18 namespace dom {

    20 struct SupportsParsingInfo

    21 {

    22   nsIURI* mDocURI;

    23   nsIURI* mBaseURI;

    24   nsIPrincipal* mPrincipal;

    25 };

    27 static nsresult

    28 GetParsingInfo(nsISupports* aGlobal,

    29                SupportsParsingInfo& aInfo)

    30 {

    31   if (!aGlobal) {

    32     return NS_ERROR_FAILURE;

    33   }

    35   nsGlobalWindow* win = nsGlobalWindow::FromSupports(aGlobal);

    36   nsCOMPtr<nsIDocument> doc = win->GetDoc();

    37   if (!doc) {

    38     return NS_ERROR_FAILURE;

    39   }

    41   aInfo.mDocURI = nsCOMPtr<nsIURI>(doc->GetDocumentURI());

    42   aInfo.mBaseURI = nsCOMPtr<nsIURI>(doc->GetBaseURI());

    43   aInfo.mPrincipal = win->GetPrincipal();

    44   return NS_OK;

    45 }

    47 /* static */ bool

    48 CSS::Supports(const GlobalObject& aGlobal,

    49               const nsAString& aProperty,

    50               const nsAString& aValue,

    51               ErrorResult& aRv)

    52 {

    53   nsCSSParser parser;

    54   SupportsParsingInfo info;

    56   nsresult rv = GetParsingInfo(aGlobal.GetAsSupports(), info);

    57   if (NS_FAILED(rv)) {

    58     aRv.Throw(rv);

    59     return false;

    60   }

    62   return parser.EvaluateSupportsDeclaration(aProperty, aValue, info.mDocURI,

    63                                             info.mBaseURI, info.mPrincipal);

    64 }

    66 /* static */ bool

    67 CSS::Supports(const GlobalObject& aGlobal,

    68               const nsAString& aCondition,

    69               ErrorResult& aRv)

    70 {

    71   nsCSSParser parser;

    72   SupportsParsingInfo info;

    74   nsresult rv = GetParsingInfo(aGlobal.GetAsSupports(), info);

    75   if (NS_FAILED(rv)) {

    76     aRv.Throw(rv);

    77     return false;

    78   }

    80   return parser.EvaluateSupportsCondition(aCondition, info.mDocURI,

    81                                           info.mBaseURI, info.mPrincipal);

    82 }

    84 /* static */ void

    85 CSS::Escape(const GlobalObject& aGlobal,

    86             const nsAString& aIdent,

    87             nsAString& aReturn,

    88             ErrorResult& aRv)

    89 {

    90   bool success = nsStyleUtil::AppendEscapedCSSIdent(aIdent, aReturn);

    92   if (!success) {

    93     aRv.Throw(NS_ERROR_DOM_INVALID_CHARACTER_ERR);

    94   }

    95 }

    97 } // dom

    98 } // mozilla

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