mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-30 02:03:14 +03:00
257 lines
8.2 KiB
Plaintext
257 lines
8.2 KiB
Plaintext
/*
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* This file is part of NetSurf, http://netsurf.sourceforge.net/
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* Licensed under the GNU General Public License,
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* http://www.opensource.org/licenses/gpl-license
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* Copyright 2003 James Bursa <bursa@users.sourceforge.net>
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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.
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statement_list ::= .
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statement_list ::= statement_list statement.
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statement ::= ruleset.
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statement ::= at_rule.
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at_rule ::= ATKEYWORD any_list block.
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at_rule ::= ATKEYWORD(A) any_list(B) SEMI.
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{ if (strcasecmp(A, "@import") == 0)
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css_atimport(param->stylesheet, B);
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free(A); css_free_node(B); }
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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 ::= selector_list(A) LBRACE declaration_list(B) RBRACE.
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{ css_add_ruleset(param->stylesheet, A, B);
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css_free_node(B); }
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ruleset ::= LBRACE declaration_list(A) RBRACE.
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/* this form of ruleset not used in CSS2
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used to parse style attributes (ruleset_only = 1) */
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{ if (param->ruleset_only) param->declaration = A;
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else css_free_node(A); }
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ruleset ::= any_list_1(A) LBRACE declaration_list(B) RBRACE.
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{ css_free_node(A); css_free_node(B); } /* not CSS2 */
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selector_list(A) ::= selector(B).
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{ A = B; }
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selector_list(A) ::= selector_list(B) COMMA selector(C).
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{ C->next = B; A = C; }
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selector(A) ::= simple_selector(B).
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{ A = B; }
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selector(A) ::= selector(B) css_combinator(C) simple_selector(D).
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{ D->right = B; D->comb = C; A = D;
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A->specificity += B->specificity; }
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css_combinator(A) ::= .
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{ A = CSS_COMB_ANCESTOR; }
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css_combinator(A) ::= PLUS.
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{ A = CSS_COMB_PRECEDED; }
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css_combinator(A) ::= GT.
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{ A = CSS_COMB_PARENT; }
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simple_selector(A) ::= element_name(B) detail_list(C).
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{ A = css_new_node(CSS_NODE_SELECTOR, B, C, 0);
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A->specificity = 1 + C->specificity; }
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simple_selector(A) ::= element_name(B).
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{ A = css_new_node(CSS_NODE_SELECTOR, B, 0, 0);
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A->specificity = 1; }
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simple_selector(A) ::= detail_list(C).
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{ A = css_new_node(CSS_NODE_SELECTOR, 0, C, 0);
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A->specificity = C->specificity; }
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element_name(A) ::= IDENT(B).
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{ A = B; }
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detail_list(A) ::= detail(B).
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{ A = B; }
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detail_list(A) ::= detail(B) detail_list(C).
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{ A = B; A->specificity += C->specificity; A->next = C; }
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detail(A) ::= HASH(B).
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{ A = css_new_node(CSS_NODE_ID, B, 0, 0);
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A->specificity = 0x10000; }
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detail(A) ::= DOT IDENT(B).
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{ A = css_new_node(CSS_NODE_CLASS, B, 0, 0);
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A->specificity = 0x100; }
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detail(A) ::= LBRAC IDENT(B) RBRAC.
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{ A = css_new_node(CSS_NODE_ATTRIB, B, 0, 0);
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A->specificity = 0x100; }
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detail(A) ::= LBRAC IDENT(B) EQUALS IDENT(C) RBRAC.
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{ A = css_new_node(CSS_NODE_ATTRIB_EQ, B, 0, 0); A->data2 = C;
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A->specificity = 0x100; }
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detail(A) ::= LBRAC IDENT(B) EQUALS STRING(C) RBRAC.
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{ A = css_new_node(CSS_NODE_ATTRIB_EQ, B, 0, 0); A->data2 = css_unquote(C);
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A->specificity = 0x100; }
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detail(A) ::= LBRAC IDENT(B) INCLUDES IDENT(C) RBRAC.
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{ A = css_new_node(CSS_NODE_ATTRIB_INC, B, 0, 0); A->data2 = C;
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A->specificity = 0x100; }
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detail(A) ::= LBRAC IDENT(B) INCLUDES STRING(C) RBRAC.
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{ A = css_new_node(CSS_NODE_ATTRIB_INC, B, 0, 0); A->data2 = css_unquote(C);
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A->specificity = 0x100; }
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detail(A) ::= LBRAC IDENT(B) DASHMATCH IDENT(C) RBRAC.
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{ A = css_new_node(CSS_NODE_ATTRIB_DM, B, 0, 0); A->data2 = C;
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A->specificity = 0x100; }
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detail(A) ::= LBRAC IDENT(B) DASHMATCH STRING(C) RBRAC.
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{ A = css_new_node(CSS_NODE_ATTRIB_DM, B, 0, 0); A->data2 = css_unquote(C);
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A->specificity = 0x100; }
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detail(A) ::= COLON IDENT(B).
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{ if (strcasecmp(B, "link") == 0) {
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A = css_new_node(CSS_NODE_ATTRIB, xstrdup("href"), 0, 0);
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A->specificity = 0x100;
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free(B);
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} else {
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A = css_new_node(CSS_NODE_PSEUDO, B, 0, 0);
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A->specificity = 0x100;
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} }
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detail(A) ::= COLON FUNCTION(B) IDENT RPAREN.
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{ A = css_new_node(CSS_NODE_PSEUDO, B, 0, 0);
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A->specificity = 0x100; }
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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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{ if (B) { B->next = C; A = B; } else { A = C; } }
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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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declaration(A) ::= any_list_1(B). /* malformed declaration: ignore */
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{ A = 0; css_free_node(B); }
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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, css_unquote(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.
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{ A = css_new_node(CSS_NODE_INCLUDES, 0, 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.
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{ A = css_new_node(CSS_NODE_DASHMATCH, 0, 0, 0); }
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any(A) ::= COLON.
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{ A = css_new_node(CSS_NODE_COLON, 0, 0, 0); }
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any(A) ::= COMMA.
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{ A = css_new_node(CSS_NODE_COMMA, 0, 0, 0); }
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any(A) ::= DOT.
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{ A = css_new_node(CSS_NODE_DOT, 0, 0, 0); }
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any(A) ::= PLUS.
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{ A = css_new_node(CSS_NODE_PLUS, 0, 0, 0); }
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any(A) ::= GT.
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{ A = css_new_node(CSS_NODE_GT, 0, 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 parse_params *param }
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%include {
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#define CSS_INTERNALS
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#include "netsurf/css/scanner.h"
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#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($$); }
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%type selector_list { struct css_node * }
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%type selector { struct css_node * }
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%type css_combinator { css_combinator }
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%type simple_selector { struct css_node * }
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%type detail_list { struct css_node * }
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%type detail { struct css_node * }
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%type declaration_list { struct css_node * }
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%type declaration { struct css_node * }
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%type value { struct css_node * }
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%type any_list { struct css_node * }
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%type any_list_1 { struct css_node * }
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%type any { struct css_node * }
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%destructor selector_list { css_free_node($$); }
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%destructor selector { css_free_node($$); }
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%destructor simple_selector { css_free_node($$); }
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%destructor detail_list { 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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%left COLON COMMA GT HASH LBRAC PLUS.
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%left DOT.
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%left IDENT.
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%left LBRACE.
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%syntax_error { param->syntax_error = true; }
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