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