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146 lines
4.2 KiB
C
146 lines
4.2 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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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/*
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* Style things for the DOM.
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* Very purty. Makes it all go.
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*/
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#include "jsapi.h"
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#include "dom.h"
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#include "plhash.h"
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#ifndef DOM_STYLE_H
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#define DOM_STYLE_H
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typedef struct DOM_StyleDatabase DOM_StyleDatabase;
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typedef struct DOM_StyleSelector DOM_StyleSelector;
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typedef struct DOM_StyleRule DOM_StyleRule;
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/*
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* DOM_StyleTokens are used for identification of elements ("H1"), style
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* properties ("color"), style values ("blue") and pseudo-classes ("visited").
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*/
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/* this may become int or something later, for speed */
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typedef const char *DOM_StyleToken;
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#define DOM_STYLE_PSEUDO_TAG (1 << 7)
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#define DOM_SELECTOR_IS_PSEUDO(sel) ((sel) & DOM_STYLE_PSEUDO_TAG)
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#define DOM_STYLE_SELECTOR_TYPE(sel) ((sel) & ~DOM_STYLE_PSEUDO_TAG)
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#define DOM_PSEUDOIZE(sel) ((sel) | DOM_STYLE_PSEUDO_TAG)
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enum {
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SELECTOR_UNKNOWN = 0,
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SELECTOR_ID,
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SELECTOR_CLASS,
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SELECTOR_TAG
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};
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struct DOM_StyleDatabase {
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PLHashTable *ht; /* PRHash, from js/ref or nsprpub, depending? */
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};
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DOM_StyleDatabase *
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DOM_NewStyleDatabase(JSContext *cx);
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struct DOM_StyleSelector {
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int8 type;
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DOM_StyleToken selector;
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DOM_StyleToken pseudo;
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DOM_StyleSelector *enclosing;
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DOM_StyleSelector *sibling;
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DOM_StyleRule *rules;
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};
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/*
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* Find or create a selector for the given enclosing element type, starting
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* from the provided (optional) base selector.
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*
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* Usage examples:
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*
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* Find/create a selector for "B"
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* sel = DOM_StyleFindSelector(cx, db, NULL, "B", NULL);
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*
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* Now find/create a selector for "CODE B":
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* sel2 = DOM_StyleFindSelector(cx, db, sel, "CODE", NULL);
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*
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* And for "A:visited CODE B":
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* sel3 = DOM_StyleFindSelector(cx, db, sel2, "A", "visited");
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*/
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DOM_StyleSelector *
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DOM_StyleFindSelector(JSContext *cx, DOM_StyleDatabase *db,
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DOM_StyleSelector *base, DOM_StyleToken enclosing,
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DOM_StyleToken pseudo);
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struct DOM_StyleRule {
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DOM_AttributeEntry entry;
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int16 weight;
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DOM_StyleRule *next;
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};
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/*
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* Parses a style rule and adds it to the style database.
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* If len is 0, rule is presumed to be NUL-terminated.
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*
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* Usage example:
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*
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* DOM_StyleParseRule(JSContext *cx, DOM_StyleDatabase *db,
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* "A:visited { color: blue }", 0, DOM_STYLE_WEIGHT_AUTHOR);
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*/
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#define DOM_STYLE_WEIGHT_NONE 0
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#define DOM_STYLE_WEIGHT_UA 2
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#define DOM_STYLE_WEIGHT_USER 4
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#define DOM_STYLE_WEIGHT_AUTHOR 6
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JSBool
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DOM_StyleParseRule(JSContext *cx, DOM_StyleDatabase *db, const char *rule,
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uintN len, intN baseWeight);
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/*
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* Get a style property for a node.
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* The node must be an Element or Text node. If it's a text node, the
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* enclosing Element is used for finding matches. The implementation is
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* necessarily somewhat hairy. See domstyle.c for details.
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*
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* Usage examples:
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*
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* Get the color for a section of text:
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* DOM_StyleGetProperty(cx, db, (DOM_Node *)text, "color", &entry);
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*
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* Find the display property of a list item:
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* DOM_StyleGetProperty(cx, db, (DOM_Node *)listItem, "display", &entry);
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*/
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JSBool
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DOM_StyleGetProperty(JSContext *cx, DOM_StyleDatabase *db, DOM_Node *node,
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DOM_StyleToken property, DOM_StyleToken psuedo,
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DOM_AttributeEntry **entryp);
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/*
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* Add a property to the provided selector.
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*
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* DOM_StyleAddRule(cx, db, sel, "color", "blue");
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*/
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JSBool
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DOM_StyleAddRule(JSContext *cx, DOM_StyleDatabase *db, DOM_StyleSelector *sel,
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DOM_StyleToken name, const char *value);
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#endif /* DOM_STYLE_H */
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