gecko-dev/layout/style/nsDOMCSSDeclaration.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
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 * Version 1.1 (the "License"); you may not use this file except in
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 *
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 * 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 Communicator client code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
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 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 *
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 * 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"),
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#include "nsDOMCSSDeclaration.h"
#include "nsIDOMCSSRule.h"
#include "nsICSSParser.h"
#include "nsIStyleRule.h"
#include "nsCSSDeclaration.h"
#include "nsCSSProps.h"
#include "nsCOMPtr.h"
#include "nsIURL.h"

#include "nsContentUtils.h"


nsDOMCSSDeclaration::nsDOMCSSDeclaration()
  : mInner(nsnull)
{
}

nsDOMCSSDeclaration::~nsDOMCSSDeclaration()
{
}


NS_IMETHODIMP
nsDOMCSSDeclaration::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
  if (!aInstancePtr) {
    NS_ERROR("QueryInterface requires a non-NULL destination!");
    return NS_ERROR_NULL_POINTER;
  }

  nsISupports* inst;

  if (aIID.Equals(NS_GET_IID(nsIDOMCSSStyleDeclaration))) {
    inst = NS_STATIC_CAST(nsIDOMCSSStyleDeclaration*, this);
  } else if (aIID.Equals(NS_GET_IID(nsIDOMCSS2Properties))) {
    if (!mInner) {
      mInner = new CSS2PropertiesTearoff(this);
      NS_ENSURE_TRUE(mInner, NS_ERROR_OUT_OF_MEMORY);
    }
    inst = NS_STATIC_CAST(nsIDOMCSS2Properties*,
                          NS_STATIC_CAST(nsISupports*, mInner));
  } else if (aIID.Equals(NS_GET_IID(nsIDOMNSCSS2Properties))) {
    if (!mInner) {
      mInner = new CSS2PropertiesTearoff(this);
      NS_ENSURE_TRUE(mInner, NS_ERROR_OUT_OF_MEMORY);
    }
    inst = NS_STATIC_CAST(nsIDOMNSCSS2Properties*,
                          NS_STATIC_CAST(nsISupports*, mInner));
  } else if (aIID.Equals(NS_GET_IID(nsISupports))) {
    inst = NS_STATIC_CAST(nsISupports*,
                          NS_STATIC_CAST(nsIDOMCSSStyleDeclaration*, this));
  } else if (aIID.Equals(NS_GET_IID(nsIClassInfo))) {
    inst = nsContentUtils::GetClassInfoInstance(eDOMClassInfo_CSSStyleDeclaration_id);
    NS_ENSURE_TRUE(inst, NS_ERROR_OUT_OF_MEMORY);
  } else {
    inst = nsnull;
  }

  nsresult rv;
  if (!inst) {
    rv = NS_NOINTERFACE;
  } else {
    NS_ADDREF(inst);
    rv = NS_OK;
  }

  *aInstancePtr = inst;
  return rv;
}


NS_IMPL_ADDREF(nsDOMCSSDeclaration);
NS_IMPL_RELEASE(nsDOMCSSDeclaration);


NS_IMETHODIMP
nsDOMCSSDeclaration::GetCssText(nsAString& aCssText)
{
  nsCSSDeclaration* decl;
  aCssText.Truncate();
  GetCSSDeclaration(&decl, PR_FALSE);
  NS_ASSERTION(decl, "null CSSDeclaration");

  if (decl) {
    decl->ToString(aCssText);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsDOMCSSDeclaration::SetCssText(const nsAString& aCssText)
{
  return ParseDeclaration(aCssText, PR_FALSE, PR_TRUE);
}

NS_IMETHODIMP
nsDOMCSSDeclaration::GetLength(PRUint32* aLength)
{
  nsCSSDeclaration *decl;
  nsresult result = GetCSSDeclaration(&decl, PR_FALSE);
 
  *aLength = 0;
  if ((NS_OK == result) && (nsnull != decl)) {
    *aLength = decl->Count();
  }

  return result;
}

NS_IMETHODIMP
nsDOMCSSDeclaration::GetParentRule(nsIDOMCSSRule** aParentRule)
{
  NS_ENSURE_ARG_POINTER(aParentRule);
  *aParentRule = nsnull;

  nsCOMPtr<nsISupports> parent;

  GetParent(getter_AddRefs(parent));

  if (parent) {
    CallQueryInterface(parent, aParentRule);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsDOMCSSDeclaration::GetPropertyCSSValue(const nsAString& aPropertyName,
                                         nsIDOMCSSValue** aReturn)
{
  NS_ENSURE_ARG_POINTER(aReturn);

  // We don't support CSSValue yet so we'll just return null...
  *aReturn = nsnull;

  return NS_OK;
}

NS_IMETHODIMP
nsDOMCSSDeclaration::Item(PRUint32 aIndex, nsAString& aReturn)
{
  nsCSSDeclaration *decl;
  nsresult result = GetCSSDeclaration(&decl, PR_FALSE);

  aReturn.SetLength(0);
  if ((NS_OK == result) && (nsnull != decl)) {
    result = decl->GetNthProperty(aIndex, aReturn);
  }

  return result;
}

NS_IMETHODIMP    
nsDOMCSSDeclaration::GetPropertyValue(const nsAString& aPropertyName, 
                                      nsAString& aReturn)
{
  nsCSSValue val;
  nsCSSDeclaration *decl;
  nsresult result = GetCSSDeclaration(&decl, PR_FALSE);

  aReturn.SetLength(0);
  if ((NS_OK == result) && (nsnull != decl)) {
    result = decl->GetValue(aPropertyName, aReturn);
  }

  return result;
}

NS_IMETHODIMP    
nsDOMCSSDeclaration::GetPropertyPriority(const nsAString& aPropertyName, 
                                         nsAString& aReturn)
{
  nsCSSDeclaration *decl;
  nsresult result = GetCSSDeclaration(&decl, PR_FALSE);
  PRBool isImportant = PR_FALSE;

  if ((NS_OK == result) && (nsnull != decl)) {
    isImportant = decl->GetValueIsImportant(aPropertyName);
  }

  if ((NS_OK == result) && isImportant) {
    aReturn.Assign(NS_LITERAL_STRING("important"));    
  }
  else {
    aReturn.SetLength(0);
  }

  return result;
}

NS_IMETHODIMP    
nsDOMCSSDeclaration::SetProperty(const nsAString& aPropertyName, 
                                 const nsAString& aValue, 
                                 const nsAString& aPriority)
{
  if (aValue.IsEmpty()) {
     // If the new value of the property is an empty string we remove the
     // property.
    nsAutoString tmp;
    return RemoveProperty(aPropertyName, tmp);
  }

  if (aPriority.IsEmpty()) {
    return ParsePropertyValue(aPropertyName, aValue);
  }

  // ParsePropertyValue does not handle priorities correctly -- it's
  // optimized for speed.  And the priority is not part of the
  // property value anyway.... So we have to use the full-blown
  // ParseDeclaration()
  return ParseDeclaration(aPropertyName + NS_LITERAL_STRING(":") +
                          aValue + NS_LITERAL_STRING("!") + aPriority,
                          PR_TRUE, PR_FALSE);
}

//////////////////////////////////////////////////////////////////////////////

CSS2PropertiesTearoff::CSS2PropertiesTearoff(nsISupports *aOuter)
{
  NS_INIT_AGGREGATED(aOuter);
}

CSS2PropertiesTearoff::~CSS2PropertiesTearoff()
{
}

NS_IMPL_AGGREGATED(CSS2PropertiesTearoff);

NS_INTERFACE_MAP_BEGIN_AGGREGATED(CSS2PropertiesTearoff)
  NS_INTERFACE_MAP_ENTRY(nsIDOMCSS2Properties)
  NS_INTERFACE_MAP_ENTRY(nsIDOMNSCSS2Properties)
NS_INTERFACE_MAP_END_AGGREGATED(fOuter)


// nsIDOMCSS2Properties
// nsIDOMNSCSS2Properties

#define CSS_PROP(name_, id_, method_, hint_)                            \
  NS_IMETHODIMP                                                         \
  CSS2PropertiesTearoff::Get##method_(nsAString& aValue)                \
  {                                                                     \
    return NS_STATIC_CAST(nsIDOMCSSStyleDeclaration*, fOuter)->         \
      GetPropertyValue(NS_LITERAL_STRING(#name_), aValue);              \
  }                                                                     \
                                                                        \
  NS_IMETHODIMP                                                         \
  CSS2PropertiesTearoff::Set##method_(const nsAString& aValue)          \
  {                                                                     \
    return NS_STATIC_CAST(nsIDOMCSSStyleDeclaration*, fOuter)->         \
      SetProperty(NS_LITERAL_STRING(#name_), aValue,                    \
                  NS_LITERAL_STRING(""));                               \
  }

#define CSS_PROP_INTERNAL(name_, id_, method_, hint_)  /* nothing */
#define CSS_PROP_NOTIMPLEMENTED(name_, id_, method_, hint_)             \
  CSS_PROP(name_, id_, method_, hint_)
#include "nsCSSPropList.h"
#undef CSS_PROP_INTERNAL
#undef CSS_PROP