[project @ 2003-03-25 21:03:14 by bursa]
New CSS parser. svn path=/import/netsurf/; revision=108
This commit is contained in:
James Bursa
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91f8a679db
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/**
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* $Id: parser.y,v 1.1 2003/03/25 21:03:14 bursa Exp $
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*/
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/*
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CSS parser using the lemon parser generator
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see CSS2 Specification, chapter 4
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http://www.w3.org/TR/REC-CSS2/syndata.html,
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and errata
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http://www.w3.org/Style/css2-updates/REC-CSS2-19980512-errata
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stylesheet : [ CDO | CDC | S | statement ]*;
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statement : ruleset | at-rule;
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at-rule : ATKEYWORD S* any* [ block | ';' S* ];
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block : '{' S* [ any | block | ATKEYWORD S* | ';' ]* '}' S*;
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ruleset : selector? '{' S* declaration? [ ';' S* declaration? ]* '}' S*;
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selector : any+;
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declaration : property ':' S* value;
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property : IDENT S*;
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value : [ any | block | ATKEYWORD S* ]+;
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any : [ IDENT | NUMBER | PERCENTAGE | DIMENSION | STRING
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| DELIM | URI | HASH | UNICODE-RANGE | INCLUDES
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| FUNCTION | DASHMATCH | '(' any* ')' | '[' any* ']' ] S*;
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Note: S, CDO, CDC will be stripped out by the scanner
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*/
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stylesheet ::= statement_list(A).
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{ *stylesheet = A; }
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statement_list(A) ::= .
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{ A = 0; }
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statement_list(A) ::= statement(B) statement_list(C).
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{ if (B == 0) { A = C; } else { B->next = C; A = B; } }
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statement(A) ::= ruleset(B).
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{ A = B; }
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statement(A) ::= at_rule(B).
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{ A = B; }
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at_rule(A) ::= ATKEYWORD any_list block.
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{ A = css_new_node(CSS_NODE_AT_RULE, 0, 0, 0); }
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at_rule(A) ::= ATKEYWORD any_list SEMI.
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{ A = css_new_node(CSS_NODE_AT_RULE, 0, 0, 0); }
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block ::= LBRACE block_body RBRACE.
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block_body ::= .
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block_body ::= block_body any.
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block_body ::= block_body block.
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block_body ::= block_body ATKEYWORD.
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block_body ::= block_body SEMI.
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ruleset(A) ::= selector(B) LBRACE declaration_list(C) RBRACE.
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{ A = css_new_node(CSS_NODE_RULESET, 0, B, C); }
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ruleset(A) ::= LBRACE declaration_list RBRACE.
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{ A = 0; } /* this form of ruleset not used in CSS2 */
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selector(A) ::= any_list_1(B).
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{ A = B; }
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declaration_list(A) ::= .
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{ A = 0; }
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declaration_list(A) ::= declaration(B).
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{ A = B; }
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declaration_list(A) ::= declaration_list(B) SEMI.
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{ A = B; }
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declaration_list(A) ::= declaration(B) SEMI declaration_list(C).
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{ B->next = C; A = B; }
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declaration(A) ::= property(B) COLON value(C).
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{ A = css_new_node(CSS_NODE_DECLARATION, B, C, 0); }
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property(A) ::= IDENT(B).
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{ A = B; }
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value(A) ::= any(B).
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{ A = B; }
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value(A) ::= any(B) value(C).
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{ B->next = C; A = B; }
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value(A) ::= value(B) block.
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{ A = B; }
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value(A) ::= value(B) ATKEYWORD.
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{ A = B; }
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any_list(A) ::= .
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{ A = 0; }
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any_list(A) ::= any(B) any_list(C).
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{ B->next = C; A = B; }
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any_list_1(A) ::= any(B) any_list(C).
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{ B->next = C; A = B; }
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any(A) ::= IDENT(B).
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{ A = css_new_node(CSS_NODE_IDENT, B, 0, 0); }
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any(A) ::= NUMBER(B).
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{ A = css_new_node(CSS_NODE_NUMBER, B, 0, 0); }
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any(A) ::= PERCENTAGE(B).
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{ A = css_new_node(CSS_NODE_PERCENTAGE, B, 0, 0); }
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any(A) ::= DIMENSION(B).
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{ A = css_new_node(CSS_NODE_DIMENSION, B, 0, 0); }
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any(A) ::= STRING(B).
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{ A = css_new_node(CSS_NODE_STRING, B, 0, 0); }
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any(A) ::= DELIM(B).
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{ A = css_new_node(CSS_NODE_DELIM, B, 0, 0); }
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any(A) ::= URI(B).
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{ A = css_new_node(CSS_NODE_URI, B, 0, 0); }
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any(A) ::= HASH(B).
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{ A = css_new_node(CSS_NODE_HASH, B, 0, 0); }
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any(A) ::= UNICODE_RANGE(B).
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{ A = css_new_node(CSS_NODE_UNICODE_RANGE, B, 0, 0); }
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any(A) ::= INCLUDES(B).
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{ A = css_new_node(CSS_NODE_INCLUDES, B, 0, 0); }
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any(A) ::= FUNCTION(B).
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{ A = css_new_node(CSS_NODE_FUNCTION, B, 0, 0); }
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any(A) ::= DASHMATCH(B).
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{ A = css_new_node(CSS_NODE_DASHMATCH, B, 0, 0); }
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any(A) ::= COLON(B).
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{ A = css_new_node(CSS_NODE_COLON, B, 0, 0); }
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any(A) ::= LPAREN any_list(B) RPAREN.
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{ A = css_new_node(CSS_NODE_PAREN, 0, B, 0); }
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any(A) ::= LBRAC any_list(B) RBRAC.
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{ A = css_new_node(CSS_NODE_BRAC, 0, B, 0); }
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/* lemon directives */
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%extra_argument { struct css_node **stylesheet }
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%include { #include "netsurf/css/css.h"
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#include "netsurf/utils/utils.h" }
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%name css_parser_
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%token_type { char* }
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%token_destructor { xfree($$); }
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%type stylesheet { struct css_node * }
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%type statement_list { struct css_node * }
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%type statement { struct css_node * }
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%type at_rule { struct css_node * }
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%type ruleset { struct css_node * }
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%type selector { struct css_node * }
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%type declaration_list { struct css_node * }
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%type declaration { struct css_node * }
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%type value { struct css_node * }
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%type any_list { struct css_node * }
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%type any_list_1 { struct css_node * }
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%type any { struct css_node * }
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%destructor stylesheet { css_free_node($$); }
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%destructor statement_list { css_free_node($$); }
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%destructor statement { css_free_node($$); }
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%destructor at_rule { css_free_node($$); }
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%destructor ruleset { css_free_node($$); }
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%destructor selector { css_free_node($$); }
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%destructor declaration_list { css_free_node($$); }
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%destructor declaration { css_free_node($$); }
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%destructor value { css_free_node($$); }
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%destructor any_list { css_free_node($$); }
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%destructor any_list_1 { css_free_node($$); }
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%destructor any { css_free_node($$); }
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%parse_failure { *stylesheet = 0; }
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@ -0,0 +1,69 @@
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/**
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* $Id: scanner.l,v 1.1 2003/03/25 21:03:14 bursa Exp $
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*/
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%{
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#include "parser.h"
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%}
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%option 8bit
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%option batch
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%option case-insensitive
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%option header-file="scanner.h"
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%option outfile="scanner.c"
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%option prefix="css_"
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%option reentrant
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%option never-interactive
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%option noyywrap
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/* see CSS2 Specification, chapter 4
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http://www.w3.org/TR/REC-CSS2/syndata.html,
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and errata
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http://www.w3.org/Style/css2-updates/REC-CSS2-19980512-errata */
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ident {nmstart}{nmchar}*
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name {nmchar}+
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nmstart [a-zA-Z_]|{nonascii}|{escape}
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nonascii [\200-\377]
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unicode \\[0-9a-f]{1,6}[ \n\r\t\f]?
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escape {unicode}|\\[ -~\200-\377]
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nmchar [-a-zA-Z0-9_]|{nonascii}|{escape}
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num [+-]?[0-9]+|[0-9]*\.[0-9]+
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string {string1}|{string2}
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string1 \"([\t !#$%&(-~]|\\{nl}|\'|{nonascii}|{escape})*\"
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string2 \'([\t !#$%&(-~]|\\{nl}|\"|{nonascii}|{escape})*\'
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nl \n|\r\n|\r|\f
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w [ \t\r\n\f]*
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%%
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{ident} { return IDENT; }
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@{ident} { return ATKEYWORD; }
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{string} { return STRING; }
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#{name} { return HASH; }
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{num} { return NUMBER; }
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{num}% { return PERCENTAGE; }
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{num}{ident} { return DIMENSION; }
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url\({w}{string}{w}\)|url\({w}([!#$%&*-~]|{nonascii}|{escape})*{w}\) {
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return URI; }
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U\+[0-9A-F?]{1,6}(-[0-9A-F]{1,6})? {
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return UNICODE_RANGE; }
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"<!--" /* ignore CDO */
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"-->" /* ignore CDC */
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; { return SEMI; }
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\{ { return LBRACE; }
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\} { return RBRACE; }
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\( { return LPAREN; }
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\) { return RPAREN; }
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\[ { return LBRAC; }
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\] { return RBRAC; }
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[ \t\r\n\f]+ /* ignore whitespace */
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\/\*[^*]*\*+([^/][^*]*\*+)*\/ /* ignore comments */
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{ident}\( { return FUNCTION; }
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~= { return INCLUDES; }
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"|=" { return DASHMATCH; }
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: { return COLON; /* missed out in spec */ }
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. { return DELIM; }
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%%
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