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/*
* cssparse.c --
*
* This file contains a lemon parser syntax for CSS stylesheets as parsed
* by Tkhtml.
*
*----------------------------------------------------------------------------
* Copyright (c) 2005 Eolas Technologies Inc.
* All rights reserved.
*
* This Open Source project was made possible through the financial support
* of Eolas Technologies Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <ORGANIZATION> nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
%name tkhtmlCssParser
%extra_argument {CssParse *pParse}
%include {
#include "cssInt.h"
#include <string.h>
#include <ctype.h>
}
/* Token prefix 'CT' stands for Css Token. */
%token_prefix CT_
%token_type {CssToken}
/* Need this value for a trick in the tokenizer used to parse CT_FUNCTION. */
%nonassoc RRP.
%syntax_error {
pParse->pStyle->nSyntaxErr++;
pParse->isIgnore = 0;
/* HtmlCssRule(pParse, 0); */
}
/* Style sheet consists of a header followed by a body. */
stylesheet ::= ss_header ss_body.
/* Optional whitespace. */
ws ::= .
ws ::= SPACE ws.
/*********************************************************************
** Style sheet header. Contains @charset and @import directives. @charset
** directives are ignored for the time being.
*/
ss_header ::= ws charset_opt imports_opt.
charset_opt ::= CHARSET_SYM ws STRING ws SEMICOLON ws.
charset_opt ::= .
imports_opt ::= imports_opt IMPORT_SYM ws term(X) medium_list_opt SEMICOLON ws.
{
HtmlCssImport(pParse, &X);
}
imports_opt ::= .
imports_opt ::= unknown_at_rule.
medium_list_opt ::= medium_list.
medium_list_opt ::= .
/*
* Code to handle an unknown "at-rule". If the tokenizer sees an "@"
* character that is not followed by any known at-keyword, it calls
* the "@" an UNKNOWN_SYM token. The correct behaviour is to discard
* everything up until the next semicolon or the end of the next
* block.
*/
unknown_at_rule ::= UNKNOWN_SYM trash SEMICOLON ws.
unknown_at_rule ::= UNKNOWN_SYM trash LP trash RP ws.
trash ::= .
trash ::= error.
trash ::= trash error.
/*********************************************************************
** Style sheet body. A list of style sheet body items.
*/
/*
ss_body ::= .
ss_body ::= ss_body_item ws ss_body.
*/
ss_body ::= ss_body_item.
ss_body ::= ss_body ws ss_body_item.
ss_body_item ::= media.
ss_body_item ::= ruleset.
ss_body_item ::= font_face.
/*********************************************************************
** @media {...} block.
*/
media ::= MEDIA_SYM ws medium_list LP ws ruleset_list RP. {
pParse->isIgnore = 0;
}
%type medium_list {int}
%type medium_list_item {int}
medium_list_item(A) ::= IDENT(X). {
if (
(X.n == 3 && 0 == strnicmp(X.z, "all", 3)) ||
(X.n == 6 && 0 == strnicmp(X.z, "screen", 6))
) {
A = 0;
} else {
A = 1;
}
}
medium_list(A) ::= medium_list_item(X) ws. {
A = X;
pParse->isIgnore = A;
}
medium_list(A) ::= medium_list_item(X) ws COMMA ws medium_list(Y). {
A = (X && Y) ? 1 : 0;
pParse->isIgnore = A;
}
/*********************************************************************
** @page {...} block.
*/
page ::= page_sym ws pseudo_opt LP declaration_list RP. {
pParse->isIgnore = 0;
}
pseudo_opt ::= COLON IDENT ws.
pseudo_opt ::= .
page_sym ::= PAGE_SYM. {
pParse->isIgnore = 1;
}
/*********************************************************************
** @font_face {...} block.
*/
font_face ::= FONT_SYM LP declaration_list RP.
/*********************************************************************
** Style sheet rules. e.g. "<selector> { <properties> }"
*/
ruleset_list ::= ruleset ws.
ruleset_list ::= ruleset ws ruleset_list.
ruleset ::= selector_list LP declaration_list RP. {
HtmlCssRule(pParse, 1);
}
ruleset ::= page.
selector_list ::= selector.
selector_list ::= selector_list comma ws selector.
comma ::= COMMA. {
HtmlCssSelectorComma(pParse);
}
declaration_list ::= declaration.
declaration_list ::= declaration_list SEMICOLON declaration.
declaration_list ::= declaration_list SEMICOLON ws.
declaration ::= ws IDENT(X) ws COLON ws expr(E) prio(I). {
HtmlCssDeclaration(pParse, &X, &E, I);
}
declaration ::= garbage.
garbage ::= garbage_token.
garbage ::= garbage garbage_token.
garbage_token ::= error.
garbage_token ::= LP garbage RP.
%type prio {int}
prio(X) ::= IMPORTANT_SYM ws. {X = (pParse->pStyleId) ? 1 : 0;}
prio(X) ::= . {X = 0;}
/*********************************************************************
** Selector syntax. This is in a section of it's own because it's
** complicated.
*/
selector ::= simple_selector ws.
selector ::= simple_selector combinator selector.
/*
* CSS Selector Grammar Summary:
*
* <selector> := <simple-selector> ?<combinator> <selector>?
* <combinator> := "+" | ">" | " "
* <simple-selector> := <tag> <s-selector-tail>
* <tag> := "*" | id | ""
* <s-selector-tail> := (#id | .id | :id | [id] | [id <sym> string])*
* <sym> := "=" | "|=" | "~="
*/
combinator ::= ws PLUS ws. {
HtmlCssSelector(pParse, CSS_SELECTORCHAIN_ADJACENT, 0, 0);
}
combinator ::= ws GT ws. {
HtmlCssSelector(pParse, CSS_SELECTORCHAIN_CHILD, 0, 0);
}
combinator ::= SPACE ws. {
HtmlCssSelector(pParse, CSS_SELECTORCHAIN_DESCENDANT, 0, 0);
}
simple_selector ::= tag simple_selector_tail.
simple_selector ::= simple_selector_tail.
simple_selector ::= tag.
tag ::= IDENT(X). { HtmlCssSelector(pParse, CSS_SELECTOR_TYPE, 0, &X); }
tag ::= STAR. { HtmlCssSelector(pParse, CSS_SELECTOR_UNIVERSAL, 0, 0); }
tag ::= SEMICOLON(X). { HtmlCssSelector(pParse, CSS_SELECTOR_TYPE, 0, &X); }
simple_selector_tail ::= simple_selector_tail_component.
simple_selector_tail ::= simple_selector_tail_component simple_selector_tail.
simple_selector_tail ::= error. {
HtmlCssSelector(pParse, CSS_SELECTOR_NEVERMATCH, 0, 0);
}
simple_selector_tail_component ::= HASH IDENT(X). {
HtmlCssSelector(pParse, CSS_SELECTOR_ID, 0, &X);
}
simple_selector_tail_component ::= DOT IDENT(X). {
/* A CSS class selector may not begin with a digit. Presumably this is
* because they expect to use this syntax for something else in a
* future version. For now, just insert a "never-match" condition into
* the rule to prevent it from having any affect. A bit lazy, this.
*/
if (X.n > 0 && !isdigit((int)(*X.z))) {
HtmlCssSelector(pParse, CSS_SELECTOR_CLASS, 0, &X);
} else {
HtmlCssSelector(pParse, CSS_SELECTOR_NEVERMATCH, 0, 0);
}
}
simple_selector_tail_component ::= LSP IDENT(X) RSP. {
HtmlCssSelector(pParse, CSS_SELECTOR_ATTR, &X, 0);
}
simple_selector_tail_component ::= LSP IDENT(X) EQUALS string(Y) RSP. {
HtmlCssSelector(pParse, CSS_SELECTOR_ATTRVALUE, &X, &Y);
}
simple_selector_tail_component ::= LSP IDENT(X) TILDE EQUALS string(Y) RSP. {
HtmlCssSelector(pParse, CSS_SELECTOR_ATTRLISTVALUE, &X, &Y);
}
simple_selector_tail_component ::= LSP IDENT(X) PIPE EQUALS string(Y) RSP. {
HtmlCssSelector(pParse, CSS_SELECTOR_ATTRHYPHEN, &X, &Y);
}
simple_selector_tail_component ::= COLON IDENT(X). {
HtmlCssSelector(pParse, HtmlCssPseudo(&X, 1), 0, 0);
}
simple_selector_tail_component ::= COLON COLON IDENT(X). {
HtmlCssSelector(pParse, HtmlCssPseudo(&X, 2), 0, 0);
}
string(A) ::= STRING(X). {A = X;}
string(A) ::= IDENT(X). {A = X;}
/*********************************************************************
** Expression syntax. This is very simple, it may need to be extended
** so that the structure of the expression is preserved. At present,
** all stylesheet expressions are stored as strings.
*/
expr(A) ::= term(X) ws. { A = X; }
expr(A) ::= term(X) operator expr(Y). { A.z = X.z; A.n = (Y.z+Y.n - X.z); }
operator ::= ws COMMA ws.
operator ::= ws SLASH ws.
operator ::= SPACE ws.
term(A) ::= IDENT(X). { A = X; }
term(A) ::= STRING(X). { A = X; }
term(A) ::= FUNCTION(X). { A = X; }
term(A) ::= HASH(X) IDENT(Y). { A.z = X.z; A.n = (Y.z+Y.n - X.z); }
term(A) ::= DOT(X) IDENT(Y). { A.z = X.z; A.n = (Y.z+Y.n - X.z); }
term(A) ::= IDENT(X) DOT IDENT(Y). { A.z = X.z; A.n = (Y.z+Y.n - X.z); }
term(A) ::= PLUS(X) IDENT(Y). { A.z = X.z; A.n = (Y.z+Y.n - X.z); }
term(A) ::= PLUS(X) DOT IDENT(Y). { A.z = X.z; A.n = (Y.z+Y.n - X.z); }
term(A) ::= PLUS(X) IDENT DOT IDENT(Y). { A.z = X.z; A.n = (Y.z+Y.n - X.z); }
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