The Tor Browser: editor/libeditor/base/ChangeCSSInlineStyleTxn.cpp@b8a032363ba2 (annotated)

editor/libeditor/base/ChangeCSSInlineStyleTxn.cpp@b8a032363ba2 (annotated)

editor/libeditor/base/ChangeCSSInlineStyleTxn.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- 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/. */
 #include "ChangeCSSInlineStyleTxn.h"
 #include "nsAString.h"                  // for nsAString_internal::Append, etc
 #include "nsCRT.h"                      // for nsCRT
 #include "nsDebug.h"                    // for NS_ENSURE_SUCCESS, etc
 #include "nsError.h"                    // for NS_ERROR_NULL_POINTER, etc
 #include "nsGkAtoms.h"                  // for nsGkAtoms, etc
 #include "nsIAtom.h"                    // for nsIAtom
 #include "nsIDOMCSSStyleDeclaration.h"  // for nsIDOMCSSStyleDeclaration
 #include "nsIDOMElement.h"              // for nsIDOMElement
 #include "nsIDOMElementCSSInlineStyle.h"
 #include "nsISupportsImpl.h"            // for EditTxn::QueryInterface, etc
 #include "nsISupportsUtils.h"           // for NS_ADDREF
 #include "nsLiteralString.h"            // for NS_LITERAL_STRING, etc
 #include "nsReadableUtils.h"            // for ToNewUnicode
 #include "nsString.h"                   // for nsAutoString, nsString, etc
 #include "nsUnicharUtils.h"
 #include "nsXPCOM.h"                    // for NS_Free
 class nsIEditor;
 #define kNullCh (char16_t('\0'))
 NS_IMPL_CYCLE_COLLECTION_INHERITED(ChangeCSSInlineStyleTxn, EditTxn,
                                    mElement)
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ChangeCSSInlineStyleTxn)
 NS_INTERFACE_MAP_END_INHERITING(EditTxn)
 // answers true if aValue is in the string list of white-space separated values aValueList
 // a case-sensitive search is performed if aCaseSensitive is true
 bool
 ChangeCSSInlineStyleTxn::ValueIncludes(const nsAString &aValueList, const nsAString &aValue, bool aCaseSensitive)
 {
   nsAutoString  valueList(aValueList);
   bool result = false;
   valueList.Append(kNullCh);  // put an extra null at the end
   char16_t *value = ToNewUnicode(aValue);
   char16_t *start = valueList.BeginWriting();
   char16_t *end   = start;
   while (kNullCh != *start) {
     while ((kNullCh != *start) && nsCRT::IsAsciiSpace(*start)) {  // skip leading space
       start++;
     }
     end = start;
     while ((kNullCh != *end) && (false == nsCRT::IsAsciiSpace(*end))) { // look for space or end
       end++;
     }
     *end = kNullCh; // end string here
     if (start < end) {
       if (aCaseSensitive) {
         if (!nsCRT::strcmp(value, start)) {
           result = true;
           break;
         }
       }
       else {
         if (nsDependentString(value).Equals(nsDependentString(start),
                                             nsCaseInsensitiveStringComparator())) {
           result = true;
           break;
         }
       }
     }
     start = ++end;
   }
   NS_Free(value);
   return result;
 }
 // removes the value aRemoveValue from the string list of white-space separated values aValueList
 void
 ChangeCSSInlineStyleTxn::RemoveValueFromListOfValues(nsAString & aValues, const nsAString  & aRemoveValue)
 {
   nsAutoString  classStr(aValues);  // copy to work buffer   nsAutoString  rv(aRemoveValue);
   nsAutoString  outString;
   classStr.Append(kNullCh);  // put an extra null at the end
   char16_t *start = classStr.BeginWriting();
   char16_t *end   = start;
   while (kNullCh != *start) {
     while ((kNullCh != *start) && nsCRT::IsAsciiSpace(*start)) {  // skip leading space
       start++;
     }
     end = start;
     while ((kNullCh != *end) && (false == nsCRT::IsAsciiSpace(*end))) { // look for space or end
       end++;
     }
     *end = kNullCh; // end string here
     if (start < end) {
       if (!aRemoveValue.Equals(start)) {
         outString.Append(start);
         outString.Append(char16_t(' '));
       }
     }
     start = ++end;
   }
   aValues.Assign(outString);
 }
 ChangeCSSInlineStyleTxn::ChangeCSSInlineStyleTxn()
   : EditTxn()
 {
 }
 NS_IMETHODIMP ChangeCSSInlineStyleTxn::Init(nsIEditor      *aEditor,
                                             nsIDOMElement  *aElement,
                                             nsIAtom        *aProperty,
                                             const nsAString& aValue,
                                             bool aRemoveProperty)
 {
   NS_ASSERTION(aEditor && aElement, "bad arg");
   if (!aEditor || !aElement) { return NS_ERROR_NULL_POINTER; }
   mEditor = aEditor;
   mElement = do_QueryInterface(aElement);
   mProperty = aProperty;
   NS_ADDREF(mProperty);
   mValue.Assign(aValue);
   mRemoveProperty = aRemoveProperty;
   mUndoAttributeWasSet = false;
   mRedoAttributeWasSet = false;
   mUndoValue.Truncate();
   mRedoValue.Truncate();
   return NS_OK;
 }
 NS_IMETHODIMP ChangeCSSInlineStyleTxn::DoTransaction(void)
 {
   NS_ASSERTION(mEditor && mElement, "bad state");
   if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
   nsCOMPtr<nsIDOMElementCSSInlineStyle> inlineStyles = do_QueryInterface(mElement);
   NS_ENSURE_TRUE(inlineStyles, NS_ERROR_NULL_POINTER);
   nsCOMPtr<nsIDOMCSSStyleDeclaration> cssDecl;
   nsresult result = inlineStyles->GetStyle(getter_AddRefs(cssDecl));
   NS_ENSURE_SUCCESS(result, result);
   NS_ENSURE_TRUE(cssDecl, NS_ERROR_NULL_POINTER);
   nsAutoString propertyNameString;
   mProperty->ToString(propertyNameString);
   NS_NAMED_LITERAL_STRING(styleAttr, "style");
   result = mElement->HasAttribute(styleAttr, &mUndoAttributeWasSet);
   NS_ENSURE_SUCCESS(result, result);
   nsAutoString values;
   result = cssDecl->GetPropertyValue(propertyNameString, values);
   NS_ENSURE_SUCCESS(result, result);
   mUndoValue.Assign(values);
   // does this property accept more than 1 value ?
   // we need to know that because of bug 62682
   bool multiple = AcceptsMoreThanOneValue(mProperty);
   if (mRemoveProperty) {
     nsAutoString returnString;
     if (multiple) {
       // the property can have more than one value, let's remove only
       // the value we have to remove and not the others
       // the 2 lines below are a workaround because nsDOMCSSDeclaration::GetPropertyCSSValue
       // is not yet implemented (bug 62682)
       RemoveValueFromListOfValues(values, NS_LITERAL_STRING("none"));
       RemoveValueFromListOfValues(values, mValue);
       if (values.IsEmpty()) {
         result = cssDecl->RemoveProperty(propertyNameString, returnString);
         NS_ENSURE_SUCCESS(result, result);
       }
       else {
         nsAutoString priority;
         result = cssDecl->GetPropertyPriority(propertyNameString, priority);
         NS_ENSURE_SUCCESS(result, result);
         result = cssDecl->SetProperty(propertyNameString, values,
                                       priority);
         NS_ENSURE_SUCCESS(result, result);
       }
     }
     else {
       result = cssDecl->RemoveProperty(propertyNameString, returnString);
       NS_ENSURE_SUCCESS(result, result);
     }
   }
   else {
     nsAutoString priority;
     result = cssDecl->GetPropertyPriority(propertyNameString, priority);
     NS_ENSURE_SUCCESS(result, result);
     if (multiple) {
       // the property can have more than one value, let's add
       // the value we have to add to the others
       // the line below is a workaround because nsDOMCSSDeclaration::GetPropertyCSSValue
       // is not yet implemented (bug 62682)
       AddValueToMultivalueProperty(values, mValue);
     }
     else
       values.Assign(mValue);
     result = cssDecl->SetProperty(propertyNameString, values,
                                   priority);
     NS_ENSURE_SUCCESS(result, result);
   }
   // let's be sure we don't keep an empty style attribute
   uint32_t length;
   result = cssDecl->GetLength(&length);
   NS_ENSURE_SUCCESS(result, result);
   if (!length) {
     result = mElement->RemoveAttribute(styleAttr);
     NS_ENSURE_SUCCESS(result, result);
   }
   else
     mRedoAttributeWasSet = true;
   return cssDecl->GetPropertyValue(propertyNameString, mRedoValue);
 }
 nsresult ChangeCSSInlineStyleTxn::SetStyle(bool aAttributeWasSet,
                                            nsAString & aValue)
 {
   NS_ASSERTION(mEditor && mElement, "bad state");
   if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
   nsresult result = NS_OK;
   if (aAttributeWasSet) {
     // the style attribute was set and not empty, let's recreate the declaration
     nsAutoString propertyNameString;
     mProperty->ToString(propertyNameString);
     nsCOMPtr<nsIDOMElementCSSInlineStyle> inlineStyles = do_QueryInterface(mElement);
     NS_ENSURE_TRUE(inlineStyles, NS_ERROR_NULL_POINTER);
     nsCOMPtr<nsIDOMCSSStyleDeclaration> cssDecl;
     result = inlineStyles->GetStyle(getter_AddRefs(cssDecl));
     NS_ENSURE_SUCCESS(result, result);
     NS_ENSURE_TRUE(cssDecl, NS_ERROR_NULL_POINTER);
     if (aValue.IsEmpty()) {
       // an empty value means we have to remove the property
       nsAutoString returnString;
       result = cssDecl->RemoveProperty(propertyNameString, returnString);
     }
     else {
       // let's recreate the declaration as it was
       nsAutoString priority;
       result = cssDecl->GetPropertyPriority(propertyNameString, priority);
       NS_ENSURE_SUCCESS(result, result);
       result = cssDecl->SetProperty(propertyNameString, aValue, priority);
     }
   }
   else
     result = mElement->RemoveAttribute(NS_LITERAL_STRING("style"));
   return result;
 }
 NS_IMETHODIMP ChangeCSSInlineStyleTxn::UndoTransaction(void)
 {
   return SetStyle(mUndoAttributeWasSet, mUndoValue);
 }
 NS_IMETHODIMP ChangeCSSInlineStyleTxn::RedoTransaction(void)
 {
   return SetStyle(mRedoAttributeWasSet, mRedoValue);
 }
 NS_IMETHODIMP ChangeCSSInlineStyleTxn::GetTxnDescription(nsAString& aString)
 {
   aString.AssignLiteral("ChangeCSSInlineStyleTxn: [mRemoveProperty == ");
   if (!mRemoveProperty)
     aString.AppendLiteral("false] ");
   else
     aString.AppendLiteral("true] ");
   nsAutoString tempString;
   mProperty->ToString(tempString);
   aString += tempString;
   return NS_OK;
 }
 // answers true if the CSS property accepts more than one value
 bool
 ChangeCSSInlineStyleTxn::AcceptsMoreThanOneValue(nsIAtom *aCSSProperty)
 {
   return aCSSProperty == nsGkAtoms::text_decoration;
 }
 // adds the value aNewValue to the list of white-space separated values aValues
 NS_IMETHODIMP
 ChangeCSSInlineStyleTxn::AddValueToMultivalueProperty(nsAString & aValues, const nsAString & aNewValue)
 {
   if (aValues.IsEmpty()
       || aValues.LowerCaseEqualsLiteral("none")) {
     // the list of values is empty of the value is 'none'
     aValues.Assign(aNewValue);
   }
   else if (!ValueIncludes(aValues, aNewValue, false)) {
     // we already have another value but not this one; add it
     aValues.Append(char16_t(' '));
     aValues.Append(aNewValue);
   }
   return NS_OK;
 }

The Tor Browser / annotate

editor/libeditor/base/ChangeCSSInlineStyleTxn.cpp@b8a032363ba2 (annotated)

editor/libeditor/base/ChangeCSSInlineStyleTxn.cpp