cssgrammar.y

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

%{

/*
 *  Copyright (C) 2002-2003 Lars Knoll ([e-mail])
 *  Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 *  Copyright (C) 2006 Alexey Proskuryakov ([e-mail])
 *  Copyright (C) 2008 Eric Seidel <[e-mail]>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include "config.h"

#include "CSSMediaRule.h"
#include "CSSParser.h"
#include "CSSPropertyNames.h"
#include "CSSRuleList.h"
#include "CSSSelector.h"
#include "CSSStyleSheet.h"
#include "Document.h"
#include "HTMLNames.h"
#include "MediaList.h"
#include "WebKitCSSKeyframeRule.h"
#include "WebKitCSSKeyframesRule.h"
#include <stdlib.h>
#include <string.h>

using namespace WebCore;
using namespace HTMLNames;

#define YYENABLE_NLS 0
#define YYLTYPE_IS_TRIVIAL 1
#define YYMAXDEPTH 10000
#define YYDEBUG 0

// FIXME: Replace with %parse-param { CSSParser* parser } once we can depend on bison 2.x
#define YYPARSE_PARAM parser
#define YYLEX_PARAM parser

%}

%pure_parser

%union {
    bool boolean;
    char character;
    int integer;
    double number;
    CSSParserString string;

    CSSRule* rule;
    CSSRuleList* ruleList;
    CSSSelector* selector;
    Vector<CSSSelector*>* selectorList;
    CSSSelector::Relation relation;
    MediaList* mediaList;
    MediaQuery* mediaQuery;
    MediaQuery::Restrictor mediaQueryRestrictor;
    MediaQueryExp* mediaQueryExp;
    CSSParserValue value;
    CSSParserValueList* valueList;
    Vector<MediaQueryExp*>* mediaQueryExpList;
    WebKitCSSKeyframeRule* keyframeRule;
    WebKitCSSKeyframesRule* keyframesRule;
    float val;
}

%{

static inline int cssyyerror(const char*)
{
    return 1;
}

static int cssyylex(YYSTYPE* yylval, void* parser)
{
    return static_cast<CSSParser*>(parser)->lex(yylval);
}

%}

%expect 49

%nonassoc LOWEST_PREC

%left UNIMPORTANT_TOK

%token WHITESPACE SGML_CD
%token TOKEN_EOF 0

%token INCLUDES
%token DASHMATCH
%token BEGINSWITH
%token ENDSWITH
%token CONTAINS

%token <string> STRING
%right <string> IDENT
%token <string> NTH

%nonassoc <string> HEX
%nonassoc <string> IDSEL
%nonassoc ':'
%nonassoc '.'
%nonassoc '['
%nonassoc <string> '*'
%nonassoc error
%left '|'

%token IMPORT_SYM
%token PAGE_SYM
%token MEDIA_SYM
%token FONT_FACE_SYM
%token CHARSET_SYM
%token NAMESPACE_SYM
%token WEBKIT_RULE_SYM
%token WEBKIT_DECLS_SYM
%token WEBKIT_KEYFRAME_RULE_SYM
%token WEBKIT_KEYFRAMES_SYM
%token WEBKIT_VALUE_SYM
%token WEBKIT_MEDIAQUERY_SYM
%token WEBKIT_SELECTOR_SYM
%token WEBKIT_VARIABLES_SYM
%token WEBKIT_DEFINE_SYM
%token VARIABLES_FOR
%token WEBKIT_VARIABLES_DECLS_SYM
%token ATKEYWORD

%token IMPORTANT_SYM
%token MEDIA_ONLY
%token MEDIA_NOT
%token MEDIA_AND

%token <number> QEMS
%token <number> EMS
%token <number> EXS
%token <number> PXS
%token <number> CMS
%token <number> MMS
%token <number> INS
%token <number> PTS
%token <number> PCS
%token <number> DEGS
%token <number> RADS
%token <number> GRADS
%token <number> TURNS
%token <number> MSECS
%token <number> SECS
%token <number> HERZ
%token <number> KHERZ
%token <string> DIMEN
%token <number> PERCENTAGE
%token <number> FLOATTOKEN
%token <number> INTEGER

%token <string> URI
%token <string> FUNCTION
%token <string> NOTFUNCTION

%token <string> UNICODERANGE

%token <string> VARCALL

%type <relation> combinator

%type <rule> charset
%type <rule> ruleset
%type <rule> valid_rule_or_import
%type <rule> media
%type <rule> import
%type <rule> page
%type <rule> font_face
%type <rule> keyframes
%type <rule> invalid_rule
%type <rule> save_block
%type <rule> invalid_at
%type <rule> invalid_at_list
%type <rule> invalid_import
%type <rule> invalid_media
%type <rule> rule
%type <rule> valid_rule
%type <ruleList> block_rule_list 
%type <rule> block_rule
%type <rule> block_valid_rule
%type <rule> variables_rule
%type <mediaList> variables_media_list

%type <string> maybe_ns_prefix

%type <string> namespace_selector

%type <string> string_or_uri
%type <string> ident_or_string
%type <string> medium
%type <string> hexcolor

%type <string> media_feature
%type <mediaList> media_list
%type <mediaList> maybe_media_list
%type <mediaQuery> media_query
%type <mediaQueryRestrictor> maybe_media_restrictor
%type <valueList> maybe_media_value
%type <mediaQueryExp> media_query_exp
%type <mediaQueryExpList> media_query_exp_list
%type <mediaQueryExpList> maybe_and_media_query_exp_list

%type <string> keyframe_name
%type <keyframeRule> keyframe_rule
%type <keyframesRule> keyframes_rule
%type <valueList> key_list
%type <value> key

%type <integer> property

%type <selector> specifier
%type <selector> specifier_list
%type <selector> simple_selector
%type <selector> selector
%type <selectorList> selector_list
%type <selector> selector_with_trailing_whitespace
%type <selector> class
%type <selector> attrib
%type <selector> pseudo

%type <boolean> declaration_list
%type <boolean> decl_list
%type <boolean> declaration

%type <boolean> prio

%type <integer> match
%type <integer> unary_operator
%type <character> operator

%type <valueList> expr
%type <value> term
%type <value> unary_term
%type <value> function

%type <string> element_name
%type <string> attr_name

%type <string> variable_name
%type <boolean> variables_declaration_list
%type <boolean> variables_decl_list
%type <boolean> variables_declaration
%type <value> variable_reference

%%

stylesheet:
    maybe_charset maybe_sgml import_list variables_list namespace_list rule_list
  | webkit_rule maybe_space
  | webkit_decls maybe_space
  | webkit_value maybe_space
  | webkit_mediaquery maybe_space
  | webkit_selector maybe_space
  | webkit_variables_decls maybe_space
  | webkit_keyframe_rule maybe_space
  ;

valid_rule_or_import:
    valid_rule
  | import
  ;

webkit_rule:
    WEBKIT_RULE_SYM '{' maybe_space valid_rule_or_import maybe_space '}' {
        static_cast<CSSParser*>(parser)->m_rule = $4;
    }
;

webkit_keyframe_rule:
    WEBKIT_KEYFRAME_RULE_SYM '{' maybe_space keyframe_rule maybe_space '}' {
        static_cast<CSSParser*>(parser)->m_keyframe = $4;
    }
;

webkit_decls:
    WEBKIT_DECLS_SYM '{' maybe_space declaration_list '}' {
        /* can be empty */
    }
;

webkit_variables_decls:
    WEBKIT_VARIABLES_DECLS_SYM '{' maybe_space variables_declaration_list '}' {
        /* can be empty */
    }
;

webkit_value:
    WEBKIT_VALUE_SYM '{' maybe_space expr '}' {
        CSSParser* p = static_cast<CSSParser*>(parser);
        if ($4) {
            p->m_valueList = p->sinkFloatingValueList($4);
            int oldParsedProperties = p->m_numParsedProperties;
            if (!p->parseValue(p->m_id, p->m_important))
                p->rollbackLastProperties(p->m_numParsedProperties - oldParsedProperties);
            delete p->m_valueList;
            p->m_valueList = 0;
        }
    }
;

webkit_mediaquery:
     WEBKIT_MEDIAQUERY_SYM WHITESPACE maybe_space media_query '}' {
         CSSParser* p = static_cast<CSSParser*>(parser);
         p->m_mediaQuery = p->sinkFloatingMediaQuery($4);
     }
;

webkit_selector:
    WEBKIT_SELECTOR_SYM '{' maybe_space selector_list '}' {
        if ($4) {
            CSSParser* p = static_cast<CSSParser*>(parser);
            if (p->m_selectorListForParseSelector)
                p->m_selectorListForParseSelector->adoptSelectorVector(*$4);
        }
    }
;

maybe_space:
    /* empty */ %prec UNIMPORTANT_TOK
  | maybe_space WHITESPACE
  ;

maybe_sgml:
    /* empty */
  | maybe_sgml SGML_CD
  | maybe_sgml WHITESPACE
  ;

maybe_charset:
   /* empty */
  | charset {
  }
  ;

closing_brace:
    '}'
  | %prec LOWEST_PREC TOKEN_EOF
  ;

charset:
  CHARSET_SYM maybe_space STRING maybe_space ';' {
     CSSParser* p = static_cast<CSSParser*>(parser);
     $$ = static_cast<CSSParser*>(parser)->createCharsetRule($3);
     if ($$ && p->m_styleSheet)
         p->m_styleSheet->append($$);
  }
  | CHARSET_SYM error invalid_block {
  }
  | CHARSET_SYM error ';' {
  }
;

import_list:
 /* empty */
 | import_list import maybe_sgml {
     CSSParser* p = static_cast<CSSParser*>(parser);
     if ($2 && p->m_styleSheet)
         p->m_styleSheet->append($2);
 }
 | invalid_at_list {
 }
 ;

variables_list:
/* empty */
| variables_list variables_rule maybe_sgml {
    CSSParser* p = static_cast<CSSParser*>(parser);
     if ($2 && p->m_styleSheet)
         p->m_styleSheet->append($2);
}
;

namespace_list:
/* empty */
| namespace_list namespace maybe_sgml
;

rule_list:
   /* empty */
 | rule_list rule maybe_sgml {
     CSSParser* p = static_cast<CSSParser*>(parser);
     if ($2 && p->m_styleSheet)
         p->m_styleSheet->append($2);
 }
 ;

valid_rule:
    ruleset
  | media
  | page
  | font_face
  | keyframes
  ;

rule:
    valid_rule
  | invalid_rule
  | invalid_at
  | invalid_import
  ;

block_rule_list: 
    /* empty */ { $$ = 0; }
  | block_rule_list block_rule maybe_sgml {
      $$ = $1;
      if ($2) {
          if (!$$)
              $$ = static_cast<CSSParser*>(parser)->createRuleList();
          $$->append($2);
      }
  }
  ;

block_valid_rule:
    ruleset
  | page
  | font_face
  | keyframes
  ;

block_rule:
    block_valid_rule
  | invalid_rule
  | invalid_at
  | invalid_import
  | invalid_media
  ;


import:
    IMPORT_SYM maybe_space string_or_uri maybe_space maybe_media_list ';' {
        $$ = static_cast<CSSParser*>(parser)->createImportRule($3, $5);
    }
  | IMPORT_SYM maybe_space string_or_uri maybe_space maybe_media_list invalid_block {
        $$ = 0;
    }
  | IMPORT_SYM error ';' {
        $$ = 0;
    }
  | IMPORT_SYM error invalid_block {
        $$ = 0;
    }
  ;

variables_rule:
    WEBKIT_VARIABLES_SYM maybe_space maybe_media_list '{' maybe_space variables_declaration_list '}' {
        $$ = static_cast<CSSParser*>(parser)->createVariablesRule($3, true);
    }
    |
    WEBKIT_DEFINE_SYM maybe_space variables_media_list '{' maybe_space variables_declaration_list '}' {
        $$ = static_cast<CSSParser*>(parser)->createVariablesRule($3, false);
    }
    ;

variables_media_list:
    /* empty */ {
        $$ = static_cast<CSSParser*>(parser)->createMediaList();
    }
    |
    VARIABLES_FOR WHITESPACE media_list {
        $$ = $3;
    }
    ;

variables_declaration_list:
    variables_declaration {
        $$ = $1;
    }
    | variables_decl_list variables_declaration {
        $$ = $1;
        if ($2)
            $$ = $2;
    }
    | variables_decl_list {
        $$ = $1;
    }
    | error invalid_block_list error {
        $$ = false;
    }
    | error {
        $$ = false;
    }
    | variables_decl_list error {
        $$ = $1;
    }
    ;

variables_decl_list: