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cssparser.y
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cssparser.y
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/* Parser for CSS3, as defined by http://www.w3.org/TR/css-syntax-3 */
%lex
/* Lexer Macros */
comment \/\*([^\*](\*[^\/])?)*\*\/
newline \r\n|\n|\r|\f
whitespace [ \t\n\r\f]
hex [0-9a-fA-F]
escape \\([^0-9a-fA-F\n\r\f]|({hex}{1,6}{whitespace}?))
ws {whitespace}*
nonascii [\200-\377]
token_start ({escape}|[a-zA-Z_]|{nonascii})
token_char ({escape}|[a-zA-Z_0-9-]|{nonascii})
identifier \-?{token_start}{token_char}*
string \"({escape}|\\{newline}|[^"\\\r\n\f])*\"|\'({escape}|\\{newline}|[^'\\\r\n\f])*\'
urlu ({escape}|[^'"\(\)\\ \t\n\r\f\000-\010\016-\037\177])+
number [+-]?(\d+\.\d+|\.\d+|\d+)([eE][+-]?\d+)?
range [uU]'+'({hex}{1,6}('-'{hex}{1,6})?|'?'{6}|{hex}'?'{5}|{hex}{2}'?'{4}|{hex}{3}'?'{3}|{hex}{4}'?'{2}|{hex}{5}'?'{1})
%%
/* Lexical Tokens */
{comment} return 'WHITESPACE';
{whitespace}+ return 'WHITESPACE';
{identifier}'(' return 'FUNCTION';
{identifier} return 'IDENTIFIER';
'#'{token_char}+ return 'HASH';
'@'{identifier} return 'AT_KEYWORD';
'!'{ws}'important'{ws} return 'IMPORTANT';
{string} return 'STRING';
'url('{w}({string}|{urlu})?{w}')' return 'URL';
{number}{identifier} return 'DIMENSION';
{number}'%' return 'PERCENTAGE';
{number} return 'NUMBER';
{range} return 'UNICODE_RANGE';
[~|^$\*]?'=' return 'MATCH_TOKEN';
'||' return 'COLUMN_TOKEN';
'<!--' return 'CDO';
'-->' return 'CDC';
<<EOF>> return 'EOF';
'\'' return 'SQUOTE';
. return yytext;
/lex
/* language grammar */
%start stylesheet
%ebnf
%%
stylesheet
: WS EOF { return $$ = []; }
| stylesheet_content WS EOF { return $$ = ($stylesheet_content && $stylesheet_content.length) ? $stylesheet_content : []; }
;
stylesheet_content
: stylesheet_item { $$ = []; if($stylesheet_item !== null) $$.push($stylesheet_item); }
| stylesheet_content stylesheet_item { $$ = $stylesheet_content; if($stylesheet_item !== null) $$.push($stylesheet_item); }
;
stylesheet_item
: WS CDO { $$ = null; }
| WS CDC { $$ = null; }
| qualified_rule { $$ = $qualified_rule; }
| at_rule { $$ = $at_rule; }
;
at_rule
: WS AT_KEYWORD ';' { $$ = { name: $AT_KEYWORD }}
| WS AT_KEYWORD at_rule_selector ';' { $$ = { name: $AT_KEYWORD, selector: $at_rule_selector.trim() }; if(!$$.selector) delete $$.selector; }
| WS AT_KEYWORD '{' '}' { $$ = { name: $AT_KEYWORD }; }
| WS AT_KEYWORD '{' at_rule_content '}' { $$ = { name: $AT_KEYWORD, content: $at_rule_content.trim() }; if(!$$.content) delete $$.content; }
| WS AT_KEYWORD at_rule_selector '{' '}' { $$ = { name: $AT_KEYWORD, selector: $at_rule_selector.trim() }; if(!$$.selector) delete $$.selector; }
| WS AT_KEYWORD at_rule_selector '{' at_rule_content '}' { $$ = { name: $AT_KEYWORD, selector: $at_rule_selector.trim(), content: $at_rule_content.trim() }; if(!$$.selector) delete $$.selector; if(!$$.content) delete $$.content; }
;
at_rule_selector
: any_token { $$ = $any_token; }
| at_rule_selector any_token { $$ = $at_rule_selector + $any_token; }
;
at_rule_content
: any_token { $$ = $any_token; }
| at_rule_content ';' { $$ = $at_rule_content + ';'; }
| at_rule_content '{' at_rule_content '}' { $$ = $at_rule_content1 + '{' + $at_rule_content2 + '}'; }
| at_rule_content any_token { $$ = $at_rule_content + $any_token; }
;
qualified_rule
: qualified_rule_prelude '{' WS '}' { $$ = { selector: $qualified_rule_prelude } }
| qualified_rule_prelude '{' WS declaration_list '}' { $$ = { selector: $qualified_rule_prelude, decls: $declaration_list } }
| qualified_rule_prelude '{' WS declaration_list ';' WS '}' { $$ = { selector: $qualified_rule_prelude, decls: $declaration_list } }
;
declaration_list
: declaration { $$ = [$declaration]; }
| declaration_list ';' WS declaration { $$ = $declaration_list; $$.push($declaration); }
;
declaration
: IDENTIFIER WS ':' declaration_value { $$ = [$IDENTIFIER,$declaration_value.trim()]; }
;
// Anything other than a semi-colon or a closing brace
declaration_value
: any_token { $$ = $any_token; }
| declaration_value any_token { $$ = $declaration_value + $any_token; }
;
// Does not include semi-colon, or open/close braces
any_token
: (WHITESPACE | FUNCTION | IDENTIFIER | HASH | AT_KEYWORD |
IMPORTANT | STRING | URL | DIMENSION | PERCENTAGE | NUMBER |
UNICODE_RANGE | MATCH_TOKEN | COLUMN_TOKEN | CDO | CDC | EOF | SQUOTE |
'!'|'"'|'#'|'$'|'%'|'&'|'('|')'|'*'|'+'|','|'-'|'.'|'/'|
':'|'<'|'='|'>'|'?'|'@'|'['|'\'|']'|'^'|'_'|'`'|'|'|'~') { $$ = $1; }
;
qualified_rule_prelude
: WS selector WS { $$ = [$selector]; }
| qualified_rule_prelude ',' WS selector WS { $$ = $qualified_rule_prelude; $$.push($selector); }
;
selector
: single_selector { $$ = $single_selector; }
| selector WHITESPACE single_selector { $$ = $selector + ' ' + $single_selector; }
| selector WS '>' WS single_selector { $$ = $selector + '>' + $single_selector; }
| selector WS '+' WS single_selector { $$ = $selector + '+' + $single_selector; }
| selector WS '~' WS single_selector { $$ = $selector + '~' + $single_selector; }
| ':' IDENTIFIER { $$ = ':' + $IDENTIFIER; }
| ':' ':' IDENTIFIER { $$ = '::' + $IDENTIFIER; }
| selector ':' IDENTIFIER { $$ = $selector + ':' + $IDENTIFIER; }
| selector ':' ':' IDENTIFIER { $$ = $selector + '::' + $IDENTIFIER; }
| ':' FUNCTION WS selector_function_params { $$ = ':' + $FUNCTION + $selector_function_params + ')'; }
| selector ':' FUNCTION WS selector_function_params { $$ = $selector + ':' + $FUNCTION + $selector_function_params + ')'; }
;
selector_function_params
: IDENTIFIER WS ')' { $$ = $IDENTIFIER; }
| NUMBER WS ')' { $$ = $NUMBER; }
| DIMENSION WS ')' { $$ = $DIMENSION; } // 2n
| IDENTIFIER WS NUMBER WS ')' { $$ = $IDENTIFIER + $NUMBER; } // n+1
| IDENTIFIER WS '+' WS NUMBER WS ')' { $$ = $IDENTIFIER + '+' + $NUMBER; } // n+1
| IDENTIFIER WS '-' WS NUMBER WS ')' { $$ = $IDENTIFIER + '-' + $NUMBER; } // n+1
| DIMENSION WS NUMBER WS ')' { $$ = $DIMENSION + $NUMBER; } // 2n+1
| DIMENSION WS '+' WS NUMBER WS ')' { $$ = $DIMENSION + '+' + $NUMBER; } // 2n+1
| DIMENSION WS '-' WS NUMBER WS ')' { $$ = $DIMENSION + '-' + $NUMBER; } // 2n+1
;
single_selector
: '*' { $$ = $1; }
| '.' IDENTIFIER { $$ = '.' + $IDENTIFIER; }
| HASH { $$ = $HASH; }
| IDENTIFIER { $$ = $IDENTIFIER; }
| single_selector '.' IDENTIFIER { $$ = $single_selector + '.' + $IDENTIFIER; }
| single_selector HASH { $$ = $single_selector + $HASH; }
| single_selector '[' WS attribute_selector ']' { $$ = $single_selector + '[' + $attribute_selector + ']'; }
;
attribute_selector
: attribute_name WS { $$ = $attribute_name; }
| attribute_name WS MATCH_TOKEN WS attribute_value { $$ = $attribute_name + $MATCH_TOKEN + $attribute_value; }
;
attribute_name
: IDENTIFIER { $$ = $IDENTIFIER; }
;
attribute_value
: unquoted_attribute_value { $$ = $unquoted_attribute_value; }
| STRING { $$ = $STRING; }
;
unquoted_attribute_value
: unquoted_attribute_value_char { $$ = $unquoted_attribute_value_char; }
| IDENTIFIER { $$ = $IDENTIFIER; }
| unquoted_attribute_value unquoted_attribute_value_char { $$ = $unquoted_attribute_value + $unquoted_attribute_value_char; }
| unquoted_attribute_value IDENTIFIER { $$ = $unquoted_attribute_value + $IDENTIFIER; }
;
unquoted_attribute_value_char
: ('.'|':'|'-'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'|NUMBER) { $$ = $1; } // technically shouldn't allow full number syntax
;
WS
: /*empty*/ { $$ = ''; }
| WHITESPACE+ { $$ = ''; }
;