gecko-dev/editor/libeditor/base/ChangeCSSInlineStyleTxn.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Original Author: Daniel Glazman <glazman@netscape.com>
*
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the NPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "ChangeCSSInlineStyleTxn.h"
#include "nsIDOMElement.h"
#include "nsEditor.h"
#include "nsIDOMCSSStyleDeclaration.h"
#include "nsIDOMElementCSSInlineStyle.h"
#include "nsIContent.h"
#include "nsIEditProperty.h"
#include "nsIParser.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsCRT.h"
void
ChangeCSSInlineStyleTxn::AppendDeclaration(nsAString & aOutputString,
const nsAString & aProperty,
const nsAString & aValues)
{
aOutputString.Append(aProperty
+ NS_LITERAL_STRING(": ")
+ aValues
+ NS_LITERAL_STRING("; "));
}
// 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
PRBool
ChangeCSSInlineStyleTxn::ValueIncludes(const nsAString &aValueList, const nsAString &aValue, PRBool aCaseSensitive)
{
nsAutoString valueList(aValueList);
PRBool result = PR_FALSE;
valueList.Append(kNullCh); // put an extra null at the end
PRUnichar *value = ToNewUnicode(aValue);
PRUnichar *start = (PRUnichar*)(const PRUnichar*)valueList.get();
PRUnichar *end = start;
while (kNullCh != *start) {
while ((kNullCh != *start) && nsCRT::IsAsciiSpace(*start)) { // skip leading space
start++;
}
end = start;
while ((kNullCh != *end) && (PR_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 = PR_TRUE;
break;
}
}
else {
if (nsDependentString(value).Equals(nsDependentString(start),
nsCaseInsensitiveStringComparator())) {
result = PR_TRUE;
break;
}
}
}
start = ++end;
}
nsCRT::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
PRUnichar *start = (PRUnichar*)(const PRUnichar*)classStr.get();
PRUnichar *end = start;
while (kNullCh != *start) {
while ((kNullCh != *start) && nsCRT::IsAsciiSpace(*start)) { // skip leading space
start++;
}
end = start;
while ((kNullCh != *end) && (PR_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(PRUnichar(' '));
}
}
start = ++end;
}
aValues.Assign(outString);
}
ChangeCSSInlineStyleTxn::ChangeCSSInlineStyleTxn()
: EditTxn()
{
}
ChangeCSSInlineStyleTxn::~ChangeCSSInlineStyleTxn()
{
}
NS_IMETHODIMP ChangeCSSInlineStyleTxn::Init(nsIEditor *aEditor,
nsIDOMElement *aElement,
nsIAtom *aProperty,
const nsAString& aValue,
PRBool 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;
mPropertyWasSet = PR_FALSE;
mUndoAttributeWasSet = PR_FALSE;
mRedoAttributeWasSet = PR_FALSE;
mUndoValue.SetLength(0);
return NS_OK;
}
NS_IMETHODIMP ChangeCSSInlineStyleTxn::DoTransaction(void)
{
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
nsresult result=NS_OK;
nsCOMPtr<nsIDOMCSSStyleDeclaration> cssDecl;
PRUint32 length = 0;
nsCOMPtr<nsIDOMElementCSSInlineStyle> inlineStyles = do_QueryInterface(mElement);
if (!inlineStyles) return NS_ERROR_NULL_POINTER;
result = inlineStyles->GetStyle(getter_AddRefs(cssDecl));
if (NS_FAILED(result)) return result;
if (!cssDecl) return NS_ERROR_NULL_POINTER;
result = cssDecl->GetLength(&length);
if (NS_FAILED(result)) return result;
nsAutoString newDeclString, propertyNameString, undoString, redoString;
mProperty->ToString(propertyNameString);
mPropertyWasSet = PR_FALSE;
// does this property accept more than 1 value ?
PRBool multiple = AcceptsMoreThanOneValue(mProperty);
nsAutoString styleAttr(NS_LITERAL_STRING("style"));
result = mEditor->GetAttributeValue(mElement, styleAttr, mUndoValue, &mUndoAttributeWasSet);
if (NS_FAILED(result)) return result;
if (0 == length && !mRemoveProperty && mUndoAttributeWasSet) {
// dirty case, the style engine did not have the time to parse the style attribute
newDeclString.Append(mUndoValue + NS_LITERAL_STRING(" "));
AppendDeclaration(newDeclString, propertyNameString, mValue);
result = mElement->SetAttribute(styleAttr, newDeclString);
}
else if (0 == length) {
if (mRemoveProperty) {
// there is no style attribute or it is empty and we want to remove something
// so it is an early way out
result = mElement->RemoveAttribute(styleAttr);
}
else {
// the style attribute is empty or absent and we want to add a property
// let's do it...
AppendDeclaration(newDeclString, propertyNameString, mValue);
result = mElement->SetAttribute(styleAttr, newDeclString);
}
}
else if (mRemoveProperty && (1 == length)) {
// let's deal with a special case : we want to remove a property from the
// style attribute and it contains only one declaration...
// if it is the one we look for, let's remove the attribute ! Otherwise,
// do nothing.
nsAutoString itemPropertyNameString;
cssDecl->Item(0, itemPropertyNameString);
PRBool thisOne = propertyNameString.Equals(itemPropertyNameString, nsCaseInsensitiveStringComparator());
if (thisOne) {
mPropertyWasSet = PR_TRUE;
if (multiple) {
// the property accepts more than one value...
// cssDecl->GetPropertyValue(propertyNameString, mUndoValue);
nsAutoString values;
cssDecl->GetPropertyValue(propertyNameString, values);
RemoveValueFromListOfValues(values, NS_LITERAL_STRING("none"));
RemoveValueFromListOfValues(values, mValue);
if (0 != values.Length()) {
AppendDeclaration(newDeclString, propertyNameString, values);
}
result = mElement->SetAttribute(styleAttr, newDeclString);
}
else {
result = mElement->RemoveAttribute(styleAttr);
}
}
}
else {
// general case, we are going to browse all the CSS declarations in the
// style attribute, and, if needed, remove or rewrite the one we want
PRUint32 index;
nsAutoString itemPropertyNameString;
for (index = 0 ; index < length; index++) {
cssDecl->Item(index, itemPropertyNameString);
PRBool thisOne = propertyNameString.Equals(itemPropertyNameString, nsCaseInsensitiveStringComparator());
if (thisOne) {
// we have found the property we are looking for...
// if we have to remove it, do nothing or remove only the corresponding value
// if we have to change it, do it below
if (mRemoveProperty) {
if (multiple) {
nsAutoString values;
cssDecl->GetPropertyValue(propertyNameString, values);
RemoveValueFromListOfValues(values, NS_LITERAL_STRING("none"));
RemoveValueFromListOfValues(values, mValue);
if (0 != values.Length()) {
AppendDeclaration(newDeclString, propertyNameString, values);
}
}
}
else {
newDeclString.Append(propertyNameString + NS_LITERAL_STRING(": "));
if (multiple) {
nsAutoString values;
cssDecl->GetPropertyValue(propertyNameString, values);
AddValueToMultivalueProperty(values, mValue);
newDeclString.Append(values);
}
else {
newDeclString.Append(mValue);
}
newDeclString.Append(NS_LITERAL_STRING("; "));
}
mPropertyWasSet = PR_TRUE;
}
else {
// this is not the property we are looking for, let's recreate the declaration
nsAutoString stringValue;
cssDecl->GetPropertyValue(itemPropertyNameString, stringValue);
AppendDeclaration(newDeclString, itemPropertyNameString, stringValue);
}
}
// if we DON'T have to remove the property, ie if we have to change or set it,
// did we find it earlier ? If not, let's set it now...
if (!mRemoveProperty && !mPropertyWasSet) {
AppendDeclaration(newDeclString, propertyNameString, mValue);
}
result = mElement->SetAttribute(styleAttr, newDeclString);
}
result = mEditor->GetAttributeValue(mElement, styleAttr, mRedoValue, &mRedoAttributeWasSet);
return result;
}
// to undo a transaction, just reset the style attribute to its former value...
NS_IMETHODIMP ChangeCSSInlineStyleTxn::UndoTransaction(void)
{
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
nsresult result=NS_OK;
if (PR_TRUE == mUndoAttributeWasSet)
result = mElement->SetAttribute(NS_LITERAL_STRING("style"), mUndoValue);
else
result = mElement->RemoveAttribute(NS_LITERAL_STRING("style"));
return result;
}
// to redo a transaction, just set again the style attribute
NS_IMETHODIMP ChangeCSSInlineStyleTxn::RedoTransaction(void)
{
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
nsresult result=NS_OK;
if (PR_TRUE == mRedoAttributeWasSet)
result = mElement->SetAttribute(NS_LITERAL_STRING("style"), mRedoValue);
else
result = mElement->RemoveAttribute(NS_LITERAL_STRING("style"));
return result;
}
NS_IMETHODIMP ChangeCSSInlineStyleTxn::Merge(nsITransaction *aTransaction, PRBool *aDidMerge)
{
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP ChangeCSSInlineStyleTxn::GetTxnDescription(nsAString& aString)
{
aString.Assign(NS_LITERAL_STRING("ChangeCSSInlineStyleTxn: "));
if (PR_FALSE==mRemoveProperty)
aString += NS_LITERAL_STRING("[mRemoveProperty == false] ");
else
aString += NS_LITERAL_STRING("[mRemoveProperty == true] ");
nsAutoString tempString;
mProperty->ToString(tempString);
aString += tempString;
return NS_OK;
}
// answers true if the CSS property accepts more than one value
PRBool
ChangeCSSInlineStyleTxn::AcceptsMoreThanOneValue(nsIAtom *aCSSProperty)
{
PRBool res = PR_FALSE;
nsIAtom * textDecorationAtom = NS_NewAtom("text-decoration");
if (textDecorationAtom == aCSSProperty) {
res = PR_TRUE;
}
NS_IF_RELEASE(textDecorationAtom);
return res;
}
// 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.Equals(NS_LITERAL_STRING("none"),
nsCaseInsensitiveStringComparator())) {
// the list of values is empty of the value is 'none'
aValues.Assign(aNewValue);
}
else if (!ValueIncludes(aValues, aNewValue, PR_FALSE)) {
// we already have another value but not this one; add it
aValues.Append(PRUnichar(' '));
aValues.Append(aNewValue);
}
return NS_OK;
}