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