mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-24 23:39:51 +03:00
94433308d1
Ignore @import rules which occur after a valid rule. svn path=/import/netsurf/; revision=1835
440 lines
15 KiB
Plaintext
440 lines
15 KiB
Plaintext
/*
|
|
* This file is part of NetSurf, http://netsurf.sourceforge.net/
|
|
* Licensed under the GNU General Public License,
|
|
* http://www.opensource.org/licenses/gpl-license
|
|
* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
|
|
*/
|
|
|
|
/** \file
|
|
|
|
CSS parser using the lemon parser generator.
|
|
|
|
see CSS2.1 Specification, chapter 4
|
|
http://www.w3.org/TR/CSS21/syndata.html
|
|
|
|
stylesheet : [ CDO | CDC | S | statement ]*;
|
|
statement : ruleset | at-rule;
|
|
at-rule : ATKEYWORD S* any* [ block | ';' S* ];
|
|
block : '{' S* [ any | block | ATKEYWORD S* | ';' S* ]* '}' S*;
|
|
ruleset : selector? '{' S* declaration? [ ';' S* declaration? ]* '}' S*;
|
|
selector : any+;
|
|
declaration : DELIM? property S* ':' S* value S*;
|
|
property : IDENT;
|
|
value : [ any | block | ATKEYWORD S* ]+;
|
|
any : [ IDENT | NUMBER | PERCENTAGE | DIMENSION | STRING
|
|
| DELIM | URI | HASH | UNICODE-RANGE | INCLUDES
|
|
| DASHMATCH | FUNCTION S* any* ')'
|
|
| '(' S* any* ')' | '[' S* any* ']' ] S*;
|
|
|
|
Note: CDO, CDC will be stripped out by the scanner
|
|
*/
|
|
|
|
stylesheet ::= ws statement_list.
|
|
|
|
ws ::= .
|
|
ws ::= ws_1.
|
|
|
|
ws_1 ::= S.
|
|
ws_1 ::= ws_1 S.
|
|
|
|
statement_list ::= .
|
|
statement_list ::= statement_list statement.
|
|
|
|
statement ::= ws_1.
|
|
statement ::= ruleset.
|
|
statement ::= at_rule.
|
|
|
|
at_rule ::= ATKEYWORD ws any_list block.
|
|
at_rule ::= ATKEYWORD(A) ws any_list(B) SEMI ws.
|
|
{ if ((A.length == 7) && (strncasecmp(A.text, "@import", 7) == 0)
|
|
&& B && !param->had_ruleset)
|
|
css_atimport(param->stylesheet, B);
|
|
css_free_node(B); }
|
|
|
|
block ::= LBRACE ws block_body RBRACE ws.
|
|
block_body ::= .
|
|
block_body ::= block_body any ws.
|
|
block_body ::= block_body block.
|
|
block_body ::= block_body ATKEYWORD ws.
|
|
block_body ::= block_body SEMI ws.
|
|
|
|
ruleset ::= selector_list(A) LBRACE ws declaration_list(B) RBRACE ws.
|
|
{ if (A && B) {
|
|
param->had_ruleset = true;
|
|
css_add_ruleset(param->stylesheet, A, B);
|
|
}
|
|
else
|
|
css_free_selector(A);
|
|
css_free_node(B); }
|
|
ruleset ::= LBRACE declaration_list(A) RBRACE.
|
|
/* this form of ruleset not used in CSS2
|
|
used to parse style attributes (ruleset_only = 1) */
|
|
{ if (param->ruleset_only) param->declaration = A;
|
|
else css_free_node(A); }
|
|
ruleset ::= any_list_1(A) LBRACE declaration_list(B) RBRACE.
|
|
{ css_free_node(A); css_free_node(B); } /* not CSS2 */
|
|
|
|
selector_list(A) ::= selector(B) ws.
|
|
{ A = B; }
|
|
selector_list(A) ::= selector_list(B) COMMA ws selector(C) ws.
|
|
{ if (B && C) {
|
|
C->next = B;
|
|
A = C;
|
|
} else {
|
|
css_free_selector(B);
|
|
css_free_selector(C);
|
|
A = 0;
|
|
} }
|
|
|
|
selector(A) ::= simple_selector(B).
|
|
{ A = B; }
|
|
selector(A) ::= selector(B) css_combinator(C) simple_selector(D).
|
|
{ if (B && D) {
|
|
D->combiner = B;
|
|
D->comb = C;
|
|
D->specificity += B->specificity;
|
|
A = D;
|
|
} else {
|
|
css_free_selector(B);
|
|
css_free_selector(D);
|
|
A = 0;
|
|
} }
|
|
|
|
css_combinator(A) ::= ws PLUS ws.
|
|
{ A = CSS_COMB_PRECEDED; }
|
|
css_combinator(A) ::= ws GT ws.
|
|
{ A = CSS_COMB_PARENT; }
|
|
css_combinator(A) ::= ws_1.
|
|
{ A = CSS_COMB_ANCESTOR; }
|
|
|
|
simple_selector(A) ::= element_name(B) detail_list(C).
|
|
{ if (C && (A = css_new_selector(CSS_SELECTOR_ELEMENT,
|
|
B.text, B.length))) {
|
|
A->detail = C;
|
|
A->specificity = 1 + C->specificity;
|
|
} else {
|
|
param->memory_error = true;
|
|
css_free_selector(C);
|
|
A = 0;
|
|
} }
|
|
simple_selector(A) ::= element_name(B).
|
|
{ if ((A = css_new_selector(CSS_SELECTOR_ELEMENT,
|
|
B.text, B.length)))
|
|
A->specificity = CSS_SPECIFICITY_ELEMENT;
|
|
else
|
|
param->memory_error = true;
|
|
}
|
|
simple_selector(A) ::= detail_list(C).
|
|
{ if (C && (A = css_new_selector(CSS_SELECTOR_ELEMENT, 0, 0))) {
|
|
A->detail = C;
|
|
A->specificity = C->specificity;
|
|
} else {
|
|
param->memory_error = true;
|
|
css_free_selector(C);
|
|
A = 0;
|
|
} }
|
|
|
|
element_name(A) ::= IDENT(B).
|
|
{ A = B; }
|
|
element_name(A) ::= ASTERISK.
|
|
{ A.text = 0; }
|
|
|
|
detail_list(A) ::= detail(B).
|
|
{ A = B; }
|
|
detail_list(A) ::= detail(B) detail_list(C).
|
|
{ if (B && C) {
|
|
B->specificity += C->specificity;
|
|
B->next = C;
|
|
A = B;
|
|
} else {
|
|
css_free_selector(B);
|
|
css_free_selector(C);
|
|
A = 0;
|
|
} }
|
|
|
|
detail(A) ::= HASH(B).
|
|
{ A = css_new_selector(CSS_SELECTOR_ID, B.text+1, B.length-1);
|
|
if (A) A->specificity = CSS_SPECIFICITY_ID;
|
|
else param->memory_error = true; }
|
|
detail(A) ::= DOT IDENT(B).
|
|
{ A = css_new_selector(CSS_SELECTOR_CLASS, B.text, B.length);
|
|
if (A) A->specificity = CSS_SPECIFICITY_CLASS;
|
|
else param->memory_error = true; }
|
|
detail(A) ::= LBRAC ws IDENT(B) ws RBRAC.
|
|
{ A = css_new_selector(CSS_SELECTOR_ATTRIB, B.text, B.length);
|
|
if (A) A->specificity = CSS_SPECIFICITY_ATTR;
|
|
else param->memory_error = true; }
|
|
detail(A) ::= LBRAC ws IDENT(B) ws EQUALS ws IDENT(C) ws RBRAC.
|
|
{ A = css_new_selector(CSS_SELECTOR_ATTRIB_EQ, B.text, B.length);
|
|
if (A) { A->data2 = C.text; A->data2_length = C.length;
|
|
A->specificity = CSS_SPECIFICITY_ATTR; }
|
|
else param->memory_error = true; }
|
|
detail(A) ::= LBRAC ws IDENT(B) ws EQUALS ws STRING(C) ws RBRAC.
|
|
{ A = css_new_selector(CSS_SELECTOR_ATTRIB_EQ, B.text, B.length);
|
|
if (A) { A->data2 = C.text + 1; A->data2_length = C.length - 2;
|
|
A->specificity = CSS_SPECIFICITY_ATTR; }
|
|
else param->memory_error = true; }
|
|
detail(A) ::= LBRAC ws IDENT(B) ws INCLUDES ws IDENT(C) ws RBRAC.
|
|
{ A = css_new_selector(CSS_SELECTOR_ATTRIB_INC, B.text, B.length);
|
|
if (A) { A->data2 = C.text; A->data2_length = C.length;
|
|
A->specificity = CSS_SPECIFICITY_ATTR; }
|
|
else param->memory_error = true; }
|
|
detail(A) ::= LBRAC ws IDENT(B) ws INCLUDES ws STRING(C) ws RBRAC.
|
|
{ A = css_new_selector(CSS_SELECTOR_ATTRIB_INC, B.text, B.length);
|
|
if (A) { A->data2 = C.text + 1; A->data2_length = C.length - 2;
|
|
A->specificity = CSS_SPECIFICITY_ATTR; }
|
|
else param->memory_error = true; }
|
|
detail(A) ::= LBRAC ws IDENT(B) ws DASHMATCH ws IDENT(C) ws RBRAC.
|
|
{ A = css_new_selector(CSS_SELECTOR_ATTRIB_DM, B.text, B.length);
|
|
if (A) { A->data2 = C.text; A->data2_length = C.length;
|
|
A->specificity = CSS_SPECIFICITY_ATTR; }
|
|
else param->memory_error = true; }
|
|
detail(A) ::= LBRAC ws IDENT(B) ws DASHMATCH ws STRING(C) ws RBRAC.
|
|
{ A = css_new_selector(CSS_SELECTOR_ATTRIB_DM, B.text, B.length);
|
|
if (A) { A->data2 = C.text + 1; A->data2_length = C.length - 2;
|
|
A->specificity = CSS_SPECIFICITY_ATTR; }
|
|
else param->memory_error = true; }
|
|
detail(A) ::= LBRAC ws IDENT(B) ws PREFIX ws IDENT(C) ws RBRAC.
|
|
{ A = css_new_selector(CSS_SELECTOR_ATTRIB_PRE, B.text, B.length);
|
|
if (A) { A->data2 = C.text; A->data2_length = C.length;
|
|
A->specificity = CSS_SPECIFICITY_ATTR; }
|
|
else param->memory_error = true; }
|
|
detail(A) ::= LBRAC ws IDENT(B) ws PREFIX ws STRING(C) ws RBRAC.
|
|
{ A = css_new_selector(CSS_SELECTOR_ATTRIB_PRE, B.text, B.length);
|
|
if (A) { A->data2 = C.text + 1; A->data2_length = C.length - 2;
|
|
A->specificity = CSS_SPECIFICITY_ATTR; }
|
|
else param->memory_error = true; }
|
|
detail(A) ::= LBRAC ws IDENT(B) ws SUFFIX ws IDENT(C) ws RBRAC.
|
|
{ A = css_new_selector(CSS_SELECTOR_ATTRIB_SUF, B.text, B.length);
|
|
if (A) { A->data2 = C.text; A->data2_length = C.length;
|
|
A->specificity = CSS_SPECIFICITY_ATTR; }
|
|
else param->memory_error = true; }
|
|
detail(A) ::= LBRAC ws IDENT(B) ws SUFFIX ws STRING(C) ws RBRAC.
|
|
{ A = css_new_selector(CSS_SELECTOR_ATTRIB_SUF, B.text, B.length);
|
|
if (A) { A->data2 = C.text + 1; A->data2_length = C.length - 2;
|
|
A->specificity = CSS_SPECIFICITY_ATTR; }
|
|
else param->memory_error = true; }
|
|
detail(A) ::= LBRAC ws IDENT(B) ws SUBSTR ws IDENT(C) ws RBRAC.
|
|
{ A = css_new_selector(CSS_SELECTOR_ATTRIB_SUB, B.text, B.length);
|
|
if (A) { A->data2 = C.text; A->data2_length = C.length;
|
|
A->specificity = CSS_SPECIFICITY_ATTR; }
|
|
else param->memory_error = true; }
|
|
detail(A) ::= LBRAC ws IDENT(B) ws SUBSTR ws STRING(C) ws RBRAC.
|
|
{ A = css_new_selector(CSS_SELECTOR_ATTRIB_SUB, B.text, B.length);
|
|
if (A) { A->data2 = C.text + 1; A->data2_length = C.length - 2;
|
|
A->specificity = CSS_SPECIFICITY_ATTR; }
|
|
else param->memory_error = true; }
|
|
detail(A) ::= COLON IDENT(B).
|
|
{ if (B.length == 4 && strncasecmp(B.text, "link", 4) == 0) {
|
|
A = css_new_selector(CSS_SELECTOR_ATTRIB, "href", 4);
|
|
if (A) A->specificity = CSS_SPECIFICITY_ATTR;
|
|
else param->memory_error = true;
|
|
} else {
|
|
A = css_new_selector(CSS_SELECTOR_PSEUDO, B.text, B.length);
|
|
if (A) A->specificity = CSS_SPECIFICITY_ATTR;
|
|
else param->memory_error = true;
|
|
} }
|
|
detail(A) ::= COLON FUNCTION(B) ws IDENT ws RPAREN.
|
|
{ A = css_new_selector(CSS_SELECTOR_PSEUDO, B.text, B.length);
|
|
if (A) A->specificity = CSS_SPECIFICITY_ATTR;
|
|
else param->memory_error = true; }
|
|
detail(A) ::= COLON FUNCTION(B) ws RPAREN.
|
|
{ A = css_new_selector(CSS_SELECTOR_PSEUDO, B.text, B.length);
|
|
if (A) A->specificity = CSS_SPECIFICITY_ATTR;
|
|
else param->memory_error = true; }
|
|
|
|
declaration_list(A) ::= .
|
|
{ A = 0; }
|
|
declaration_list(A) ::= declaration(B).
|
|
{ A = B; }
|
|
declaration_list(A) ::= declaration_list(B) SEMI.
|
|
{ A = B; }
|
|
declaration_list(A) ::= declaration(B) SEMI ws declaration_list(C).
|
|
{ if (B) { B->next = C; A = B; } else { A = C; } }
|
|
|
|
declaration ::= DELIM property ws COLON ws value ws.
|
|
/* ignore this as it has no meaning in CSS2 */
|
|
|
|
declaration(A) ::= property(B) ws COLON ws value(C) ws.
|
|
{ if (C && (A = css_new_node(param->stylesheet,
|
|
CSS_NODE_DECLARATION,
|
|
B.text, B.length))) {
|
|
A->value = C;
|
|
} else {
|
|
param->memory_error = true;
|
|
css_free_node(C);
|
|
A = 0;
|
|
} }
|
|
declaration(A) ::= any_list_1(B). /* malformed declaration: ignore */
|
|
{ A = 0; css_free_node(B); }
|
|
|
|
property(A) ::= IDENT(B).
|
|
{ A = B; }
|
|
|
|
value(A) ::= any(B) ws.
|
|
{ A = B; }
|
|
value(A) ::= any(B) ws value(C).
|
|
{ if (B && C) { B->next = C; A = B; }
|
|
else { css_free_node(B); css_free_node(C); A = 0; } }
|
|
value(A) ::= value(B) ws block.
|
|
{ A = B; }
|
|
value(A) ::= value(B) ws ATKEYWORD ws.
|
|
{ A = B; }
|
|
|
|
|
|
any_list(A) ::= .
|
|
{ A = 0; }
|
|
any_list(A) ::= any(B) ws any_list(C).
|
|
{ if (B) { B->next = C; A = B; }
|
|
else { css_free_node(B); css_free_node(C); A = 0; } }
|
|
any_list_1(A) ::= any(B) ws any_list(C).
|
|
{ if (B) { B->next = C; A = B; }
|
|
else { css_free_node(B); css_free_node(C); A = 0; } }
|
|
any(A) ::= IDENT(B).
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_IDENT,
|
|
B.text, B.length);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= NUMBER(B).
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_NUMBER,
|
|
B.text, B.length);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= PERCENTAGE(B).
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_PERCENTAGE,
|
|
B.text, B.length);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= DIMENSION(B).
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_DIMENSION,
|
|
B.text, B.length);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= STRING(B).
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_STRING,
|
|
B.text + 1, B.length - 2);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= DELIM(B).
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_DELIM,
|
|
B.text, B.length);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= URI(B).
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_URI,
|
|
B.text, B.length);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= HASH(B).
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_HASH,
|
|
B.text, B.length);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= UNICODE_RANGE(B).
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_UNICODE_RANGE,
|
|
B.text, B.length);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= INCLUDES.
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_INCLUDES,
|
|
0, 0);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= FUNCTION(B) ws any_list(C) RPAREN.
|
|
{ if ((A = css_new_node(param->stylesheet, CSS_NODE_FUNCTION,
|
|
B.text, B.length)))
|
|
A->value = C;
|
|
else {
|
|
param->memory_error = true;
|
|
css_free_node(C);
|
|
A = 0;
|
|
} }
|
|
any(A) ::= DASHMATCH.
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_DASHMATCH,
|
|
0, 0);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= PREFIX.
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_PREFIX,
|
|
0, 0);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= SUFFIX.
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_SUFFIX,
|
|
0, 0);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= SUBSTR.
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_SUBSTR,
|
|
0, 0);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= COLON.
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_COLON, 0, 0);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= COMMA.
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_COMMA, 0, 0);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= DOT.
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_DOT, 0, 0);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= PLUS.
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_PLUS, 0, 0);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= GT.
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_GT, 0, 0);
|
|
if (!A) param->memory_error = true; }
|
|
any(A) ::= LPAREN ws any_list(B) RPAREN.
|
|
{ if ((A = css_new_node(param->stylesheet, CSS_NODE_PAREN,
|
|
0, 0)))
|
|
A->value = B;
|
|
else {
|
|
param->memory_error = true;
|
|
css_free_node(B);
|
|
A = 0;
|
|
} }
|
|
any(A) ::= LBRAC ws any_list(B) RBRAC.
|
|
{ if ((A = css_new_node(param->stylesheet, CSS_NODE_BRAC,
|
|
0, 0)))
|
|
A->value = B;
|
|
else {
|
|
param->memory_error = true;
|
|
css_free_node(B);
|
|
A = 0;
|
|
} }
|
|
any(A) ::= ASTERISK(B).
|
|
{ A = css_new_node(param->stylesheet, CSS_NODE_DELIM,
|
|
B.text, B.length);
|
|
if (!A) param->memory_error = true; }
|
|
|
|
|
|
/* lemon directives */
|
|
|
|
%extra_argument { struct css_parser_params *param }
|
|
%include {
|
|
#include <string.h>
|
|
#define CSS_INTERNALS
|
|
#include "netsurf/css/css.h"
|
|
#include "netsurf/utils/utils.h" }
|
|
%name css_parser_
|
|
|
|
%token_type { struct css_parser_token }
|
|
|
|
%type selector_list { struct css_selector * }
|
|
%type selector { struct css_selector * }
|
|
%type css_combinator { css_combinator }
|
|
%type simple_selector { struct css_selector * }
|
|
%type detail_list { struct css_selector * }
|
|
%type detail { struct css_selector * }
|
|
%type declaration_list { struct css_node * }
|
|
%type declaration { struct css_node * }
|
|
%type value { struct css_node * }
|
|
%type any_list { struct css_node * }
|
|
%type any_list_1 { struct css_node * }
|
|
%type any { struct css_node * }
|
|
|
|
%destructor selector_list { css_free_selector($$); }
|
|
%destructor selector { css_free_selector($$); }
|
|
%destructor simple_selector { css_free_selector($$); }
|
|
%destructor detail_list { css_free_selector($$); }
|
|
%destructor detail { css_free_selector($$); }
|
|
%destructor declaration_list { css_free_node($$); }
|
|
%destructor declaration { css_free_node($$); }
|
|
%destructor value { css_free_node($$); }
|
|
%destructor any_list { css_free_node($$); }
|
|
%destructor any_list_1 { css_free_node($$); }
|
|
%destructor any { css_free_node($$); }
|
|
|
|
%left COLON COMMA GT HASH LBRAC PLUS.
|
|
%left DOT.
|
|
%left IDENT.
|
|
%left LBRACE.
|
|
|
|
%syntax_error { param->syntax_error = true; }
|