pjs/lib/libstyle/jssrules.h

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2.6 KiB
C
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1998-03-28 05:44:41 +03:00
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/* jssrules.h --- private style sheet routines
*/
#ifndef __JSSRULES_H_
#define __JSSRULES_H_
/*
* A JSS rule consists of a list of selectors, a list of declarations,
* and a specificity of its selector
*/
struct _StyleRule {
StyleTag tag;
unsigned nSelectors;
StyleTag **selectors; /* array of pointers to StyleTag structures */
StyleRule *next;
};
/*
* Specificity is implemented as three 8-bit components: the number of tags in
* the selector (the least significant component), the number of classes in the
* selector, and the number of ids in the selector (the most significant component)
*/
#define JSS_SPECIFICITY(nTags, nClasses, nIDs)\
((uint32)(nTags) | ((uint32)(nClasses)<<8) | ((uint32)(nIDs)<<16))
/*
* This routine creates a new rule object and adds it to the list of existing
* rules
*
* Returns the new rule if successful; 0 otherwise
*/
extern StyleRule *
jss_NewRule(JSContext *mc, unsigned nSelectors, jsval *selectors);
/* Destroys a list of rules */
extern void
jss_DestroyRules(StyleRule *);
/*
* Given a list of rules and a contextual selector (array of simple
* selectors), looks to see if the contextual selector matches that of an
* existing rule
*/
extern StyleRule *
jss_LookupRule(JSContext *mc, StyleRule *rules, unsigned nSelectors, jsval *selectors);
/*
* Callback function for jss_EnumApplicableRules(). Return MOCHA_TRUE to continuing
* iterating and MOCHA_FALSE to stop
*/
typedef JSBool (* RULECALLBACK)(StyleTag *tag, void *data);
/*
* This routine takes as an argument a list of rules, a stack of open HTML
* elements, and a callback function. The callback function is called once for
* each rule that applies
*/
extern JSBool
jss_EnumApplicableRules(JSSContext *jc,
StyleRule *rules,
StyleAndTagStack *styleStack,
RULECALLBACK callback,
void *data);
#endif /* __JSSRULES_H_ */