gecko-dev/lib/libdom/domstyle.h

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* 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.
*/
/*
* Perignon: store style information in the DOM, using CSS-1 selectors.
*/
#include "jsapi.h"
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#include "dom.h"
#include "plhash.h"
#ifndef DOM_STYLE_H
#define DOM_STYLE_H
typedef struct DOM_StyleDatabase DOM_StyleDatabase;
typedef struct DOM_StyleSelector DOM_StyleSelector;
typedef struct DOM_StyleRule DOM_StyleRule;
/*
* DOM_StyleTokens are used for identification of elements ("H1"), style
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* properties ("color"), style values ("blue") and pseudo-classes ("visited").
*/
/* this may become int or something later, for speed */
typedef const char *DOM_StyleToken;
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enum {
SELECTOR_UNKNOWN = 0,
SELECTOR_ID,
SELECTOR_CLASS,
SELECTOR_TAG
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};
struct DOM_StyleDatabase {
PLHashTable *ht;
};
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DOM_StyleDatabase *
DOM_NewStyleDatabase(JSContext *cx);
void
DOM_DestroyStyleDatabase(JSContext *cx, DOM_StyleDatabase *db);
/*
* Find or create the StyleDatabase for the given JSContext.
* The embedder must provide an implementation, an example of which can be
* found in libmocha/lm_dom.c.
*/
DOM_StyleDatabase *
DOM_StyleDatabaseFromContext(JSContext *cx);
struct DOM_StyleSelector {
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int8 type;
DOM_StyleToken selector;
DOM_StyleToken pseudo;
DOM_StyleToken extra;
DOM_StyleSelector *enclosing;
DOM_StyleSelector *sibling;
DOM_StyleRule *rules;
JSObject *mocha_object; /* reflection for this selector's rules */
};
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/*
* Find or create a selector for the given enclosing element type, starting
* from the provided (optional) base selector.
*
* Usage examples:
*
* Find/create a selector for "B"
* sel = DOM_StyleFindSelector(cx, db, NULL, "B", NULL);
*
* Now find/create a selector for "CODE B":
* sel2 = DOM_StyleFindSelector(cx, db, sel, "CODE", NULL);
*
* And ".myclass CODE B":
* sel3 = DOM_StyleFindSelector(cx, db, sel2, ".myclass", NULL);
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*/
DOM_StyleSelector *
DOM_StyleFindSelector(JSContext *cx, DOM_StyleDatabase *db,
DOM_StyleSelector *base, DOM_StyleToken enclosing,
DOM_StyleToken pseudo);
/*
* As above, but take type explicitly rather than parsing leading # or . for
* ID or class. For classes or extra is a tag or NULL. For tags, extra is an
* ID or NULL. (For ID, extra is ignored.)
*/
DOM_StyleSelector *
DOM_StyleFindSelectorFull(JSContext *cx, DOM_StyleDatabase *db,
DOM_StyleSelector *base, uint8 type,
DOM_StyleToken enclosing, DOM_StyleToken extra,
DOM_StyleToken pseudo);
struct DOM_StyleRule {
DOM_AttributeEntry entry;
int16 weight;
DOM_StyleRule *next;
};
/*
* Parses a style rule and adds it to the style database.
* If len is 0, rule is presumed to be NUL-terminated. (XXX NYI)
*
* Usage example:
*
* DOM_StyleParseRule(JSContext *cx, DOM_StyleDatabase *db,
* "A:visited { color: blue }", 0, DOM_STYLE_WEIGHT_AUTHOR);
*/
#define DOM_STYLE_WEIGHT_NONE 0
#define DOM_STYLE_WEIGHT_UA 2
#define DOM_STYLE_WEIGHT_USER 4
#define DOM_STYLE_WEIGHT_AUTHOR 6
JSBool
DOM_StyleParseRule(JSContext *cx, DOM_StyleDatabase *db, const char *rule,
uintN len, intN baseWeight);
/*
* Get a style property for a node.
* The node must be an Element or Text node. If it's a text node, the
* enclosing Element is used for finding matches. The implementation is
* necessarily somewhat hairy. See domstyle.c for details.
*
* If db is NULL, DOM_StyleDatabaseFromContext is used to find it.
*
* Usage examples:
*
* Get the color for a section of text:
* DOM_StyleGetProperty(cx, db, (DOM_Node *)text, "color", &entry);
*
* Find the display property of a list item:
* DOM_StyleGetProperty(cx, db, (DOM_Node *)listItem, "display", &entry);
*/
JSBool
DOM_StyleGetProperty(JSContext *cx, DOM_StyleDatabase *db, DOM_Node *node,
DOM_StyleToken property, DOM_AttributeEntry **entryp);
/*
* Get/set the pseudoclass for an element
*/
DOM_StyleToken
DOM_GetElementPseudo(JSContext *cx, DOM_Element *element);
JSBool
DOM_SetElementPseudo(JSContext *cx, DOM_Element *element,
DOM_StyleToken pseudo);
/*
* Add a property to the provided selector.
*
* DOM_StyleAddRule(cx, db, sel, "color", "blue");
*/
DOM_AttributeEntry *
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DOM_StyleAddRule(JSContext *cx, DOM_StyleDatabase *db, DOM_StyleSelector *sel,
DOM_StyleToken name, const char *value);
/*
* Resolve classes, tags, ids, contextual on the given object.
*/
JSBool
DOM_DocObjectResolveStyleProps(JSContext *cx, JSObject *obj, jsval id);
/*
* The contextual selector JS function: contextual("H1", "EM");
*/
JSBool
DOM_JSContextual(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval);
#endif /* DOM_STYLE_H */