gecko-dev/layout/style/nsICSSStyleRule.h

/* -*- 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
 *
 * 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
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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.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):
 *   Daniel Glazman <glazman@netscape.com>
 *
 *
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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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#ifndef nsICSSStyleRule_h___
#define nsICSSStyleRule_h___

//#include <stdio.h>
#include "nsICSSRule.h"
#include "nsString.h"
#include "nsCOMPtr.h"
#include "nsCSSProps.h"
#include "nsCSSValue.h"
#include "nsIAtom.h"

class nsIAtom;
class nsCSSDeclaration;
class nsICSSStyleSheet;

struct nsAtomList {
public:
  nsAtomList(nsIAtom* aAtom);
  nsAtomList(const nsString& aAtomValue);
  nsAtomList(const nsAtomList& aCopy);
  ~nsAtomList(void);
  PRBool Equals(const nsAtomList* aOther) const;

  nsCOMPtr<nsIAtom> mAtom;
  nsAtomList*       mNext;
};

struct nsAtomStringList {
public:
  nsAtomStringList(nsIAtom* aAtom, const PRUnichar *aString = nsnull);
  nsAtomStringList(const nsString& aAtomValue, const PRUnichar *aString = nsnull);
  nsAtomStringList(const nsAtomStringList& aCopy);
  ~nsAtomStringList(void);
  PRBool Equals(const nsAtomStringList* aOther) const;

  nsCOMPtr<nsIAtom> mAtom;
  PRUnichar*        mString;
  nsAtomStringList* mNext;
};

#define NS_ATTR_FUNC_SET        0     // [attr]
#define NS_ATTR_FUNC_EQUALS     1     // [attr=value]
#define NS_ATTR_FUNC_INCLUDES   2     // [attr~=value] (space separated)
#define NS_ATTR_FUNC_DASHMATCH  3     // [attr|=value] ('-' truncated)
#define NS_ATTR_FUNC_BEGINSMATCH  4   // [attr^=value] (begins with)
#define NS_ATTR_FUNC_ENDSMATCH  5     // [attr$=value] (ends with)
#define NS_ATTR_FUNC_CONTAINSMATCH 6  // [attr*=value] (contains substring)

struct nsAttrSelector {
public:
  nsAttrSelector(PRInt32 aNameSpace, const nsString& aAttr);
  nsAttrSelector(PRInt32 aNameSpace, const nsString& aAttr, PRUint8 aFunction, 
                 const nsString& aValue, PRBool aCaseSensitive);
  nsAttrSelector(const nsAttrSelector& aCopy);
  ~nsAttrSelector(void);
  PRBool Equals(const nsAttrSelector* aOther) const;

  PRInt32         mNameSpace;
  nsIAtom*        mAttr;
  PRUint8         mFunction;
  PRPackedBool    mCaseSensitive;
  nsString        mValue;
  nsAttrSelector* mNext;
};

// Right now, there are three operators:
//   PRUnichar(0), the descendent combinator, is greedy
//   '+' and '>', the adjacent sibling and child combinators, are not
#define NS_IS_GREEDY_OPERATOR(ch) ( ch == PRUnichar(0) )

struct nsCSSSelector {
public:
  nsCSSSelector(void);
  nsCSSSelector(const nsCSSSelector& aCopy);
  ~nsCSSSelector(void);

  nsCSSSelector& operator=(const nsCSSSelector& aCopy);
  PRBool Equals(const nsCSSSelector* aOther) const;

  void Reset(void);
  void SetNameSpace(PRInt32 aNameSpace);
  void SetTag(const nsString& aTag);
  void AddID(const nsString& aID);
  void AddClass(const nsString& aClass);
  void AddPseudoClass(const nsString& aPseudoClass, const PRUnichar* aString = nsnull);
  void AddPseudoClass(nsIAtom* aPseudoClass, const PRUnichar* aString = nsnull);
  void AddAttribute(PRInt32 aNameSpace, const nsString& aAttr);
  void AddAttribute(PRInt32 aNameSpace, const nsString& aAttr, PRUint8 aFunc, 
                    const nsString& aValue, PRBool aCaseSensitive);
  void SetOperator(PRUnichar aOperator);

  PRInt32 CalcWeight(void) const;

  void ToString(nsAString& aString, nsICSSStyleSheet* aSheet) const;

private:

  void AppendNegationToString(nsAString& aString);
  void ToStringInternal(nsAString& aString, nsICSSStyleSheet* aSheet,
                        PRBool aIsPseudoElem,
                        PRIntn aNegatedIndex) const;

public:
  PRInt32         mNameSpace;
  nsCOMPtr<nsIAtom> mTag;
  nsAtomList*     mIDList;
  nsAtomList*     mClassList;
  nsAtomStringList* mPseudoClassList; // atom for the pseudo, string for
                                      // the argument to functional pseudos
  nsAttrSelector* mAttrList;
  PRUnichar       mOperator;
  nsCSSSelector*  mNegations;

  nsCSSSelector*  mNext;
};

/**
 * A selector list is the unit of selectors that each style rule has.
 * For example, "P B, H1 B { ... }" would be a selector list with two
 * items (where each |nsCSSSelectorList| object's |mSelectors| has
 * an |mNext| for the P or H1).  We represent them as linked lists.
 */
struct nsCSSSelectorList {
  nsCSSSelectorList(void);
  ~nsCSSSelectorList(void);

  /**
   * Push a copy of |aSelector| on to the beginning of |mSelectors|,
   * setting its |mNext| to the current value of |mSelectors|.
   *
   * The caller is responsible for updating |mWeight|.
   */
  void AddSelector(const nsCSSSelector& aSelector);

  /**
   * Should be used only on the first in the list
   */
  void ToString(nsAString& aResult, nsICSSStyleSheet* aSheet);

  /**
   * Do a deep clone.  Should be used only on the first in the list.
   */
  nsCSSSelectorList* Clone();

  nsCSSSelector*     mSelectors;
  PRInt32            mWeight;
  nsCSSSelectorList* mNext;
};

// IID for the nsICSSStyleRule interface {7c277af0-af19-11d1-8031-006008159b5a}
#define NS_ICSS_STYLE_RULE_IID     \
{0x7c277af0, 0xaf19, 0x11d1, {0x80, 0x31, 0x00, 0x60, 0x08, 0x15, 0x9b, 0x5a}}

class nsICSSStyleRule : public nsICSSRule {
public:
  NS_DEFINE_STATIC_IID_ACCESSOR(NS_ICSS_STYLE_RULE_IID)

  // null for style attribute
  virtual nsCSSSelectorList* Selector(void) = 0;

  virtual PRUint32 GetLineNumber(void) const = 0;
  virtual void SetLineNumber(PRUint32 aLineNumber) = 0;

  virtual nsCSSDeclaration* GetDeclaration(void) const = 0;

  /**
   * Return a new |nsIStyleRule| instance that replaces the current one,
   * due to a change in the |nsCSSDeclaration|.  Due to the
   * |nsIStyleRule| contract of immutability, this must be called if the
   * declaration is modified.
   *
   * |DeclarationChanged| handles replacing the object in the container
   * sheet or group rule if |aHandleContainer| is true.
   */
  virtual already_AddRefed<nsICSSStyleRule>
    DeclarationChanged(PRBool aHandleContainer) = 0;

  virtual already_AddRefed<nsIStyleRule> GetImportantRule(void) = 0;

  // Hook for inspector.
  virtual nsresult GetValue(nsCSSProperty aProperty, nsCSSValue& aValue) = 0;
};

nsresult
NS_NewCSSStyleRule(nsICSSStyleRule** aInstancePtrResult,
                   nsCSSSelectorList* aSelector,
                   nsCSSDeclaration* aDeclaration);

#endif /* nsICSSStyleRule_h___ */