content/xbl/src/nsXBLProtoImplField.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is Mozilla Communicator client code.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 1998
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *   David Hyatt <hyatt@netscape.com> (Original Author)
  24  *
  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either of the GNU General Public License Version 2 or later (the "GPL"),
  27  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28  * in which case the provisions of the GPL or the LGPL are applicable instead
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  35  * the terms of any one of the MPL, the GPL or the LGPL.
  36  *
  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "nsIAtom.h"
  40 #include "nsString.h"
  41 #include "jsapi.h"
  42 #include "nsIContent.h"
  43 #include "nsString.h"
  44 #include "nsUnicharUtils.h"
  45 #include "nsReadableUtils.h"
  46 #include "mozilla/FunctionTimer.h"
  47 #include "nsXBLProtoImplField.h"
  48 #include "nsIScriptContext.h"
  49 #include "nsContentUtils.h"
  50 #include "nsIURI.h"
  51
  52 nsXBLProtoImplField::nsXBLProtoImplField(const PRUnichar* aName, const PRUnichar* aReadOnly)
  53   : mNext(nsnull),
  54     mFieldText(nsnull),
  55     mFieldTextLength(0),
  56     mLineNumber(0)
  57 {
  58   MOZ_COUNT_CTOR(nsXBLProtoImplField);
  59   mName = NS_strdup(aName);  // XXXbz make more sense to use a stringbuffer?
  60
  61   mJSAttributes = JSPROP_ENUMERATE;
  62   if (aReadOnly) {
  63     nsAutoString readOnly; readOnly.Assign(aReadOnly);
  64     if (readOnly.LowerCaseEqualsLiteral("true"))
  65       mJSAttributes |= JSPROP_READONLY;
  66   }
  67 }
  68
  69 nsXBLProtoImplField::~nsXBLProtoImplField()
  70 {
  71   MOZ_COUNT_DTOR(nsXBLProtoImplField);
  72   if (mFieldText)
  73     nsMemory::Free(mFieldText);
  74   NS_Free(mName);
  75   NS_CONTENT_DELETE_LIST_MEMBER(nsXBLProtoImplField, this, mNext);
  76 }
  77
  78 void
  79 nsXBLProtoImplField::AppendFieldText(const nsAString& aText)
  80 {
  81   if (mFieldText) {
  82     nsDependentString fieldTextStr(mFieldText, mFieldTextLength);
  83     nsAutoString newFieldText = fieldTextStr + aText;
  84     PRUnichar* temp = mFieldText;
  85     mFieldText = ToNewUnicode(newFieldText);
  86     mFieldTextLength = newFieldText.Length();
  87     nsMemory::Free(temp);
  88   }
  89   else {
  90     mFieldText = ToNewUnicode(aText);
  91     mFieldTextLength = aText.Length();
  92   }
  93 }
  94
  95 nsresult
  96 nsXBLProtoImplField::InstallField(nsIScriptContext* aContext,
  97                                   JSObject* aBoundNode,
  98                                   nsIPrincipal* aPrincipal,
  99                                   nsIURI* aBindingDocURI,
 100                                   PRBool* aDidInstall) const
 101 {
 102   NS_TIME_FUNCTION_MIN(5);
 103   NS_PRECONDITION(aBoundNode,
 104                   "uh-oh, bound node should NOT be null or bad things will "
 105                   "happen");
 106
 107   *aDidInstall = PR_FALSE;
 108
 109   if (mFieldTextLength == 0) {
 110     return NS_OK;
 111   }
 112
 113   // EvaluateStringWithValue and JS_DefineUCProperty can both trigger GC, so
 114   // protect |result| here.
 115   nsresult rv;
 116
 117   nsCAutoString uriSpec;
 118   aBindingDocURI->GetSpec(uriSpec);
 119
 120   JSContext* cx = (JSContext*) aContext->GetNativeContext();
 121   NS_ASSERTION(!::JS_IsExceptionPending(cx),
 122                "Shouldn't get here when an exception is pending!");
 123
 124   // compile the literal string
 125   PRBool undefined;
 126   nsCOMPtr<nsIScriptContext> context = aContext;
 127
 128   JSAutoRequest ar(cx);
 129   jsval result = JSVAL_NULL;
 130   rv = context->EvaluateStringWithValue(nsDependentString(mFieldText,
 131                                                           mFieldTextLength),
 132                                         aBoundNode,
 133                                         aPrincipal, uriSpec.get(),
 134                                         mLineNumber, JSVERSION_LATEST,
 135                                         (void*) &result, &undefined);
 136   if (NS_FAILED(rv))
 137     return rv;
 138
 139   if (undefined) {
 140     result = JSVAL_VOID;
 141   }
 142
 143   // Define the evaluated result as a JS property
 144   nsDependentString name(mName);
 145   if (!::JS_DefineUCProperty(cx, aBoundNode,
 146                              reinterpret_cast<const jschar*>(mName),
 147                              name.Length(), result, nsnull, nsnull,
 148                              mJSAttributes)) {
 149     return NS_ERROR_OUT_OF_MEMORY;
 150   }
 151
 152   *aDidInstall = PR_TRUE;
 153   return NS_OK;
 154 }