tree-sitter-css.ebnf

//
// From tree-sitter-css/src/grammar.json
//
//
// EBNF to generate railroad diagram at 
//      (IPV6) https://www.bottlecaps.de/rr/ui
//      (IPV4) https://rr.red-dove.com/ui
//

stylesheet ::=
	 _top_level_item*

_top_level_item ::=
	 declaration
	| rule_set
	| import_statement
	| media_statement
	| charset_statement
	| namespace_statement
	| keyframes_statement
	| supports_statement
	| at_rule

import_statement ::=
	 '@import' _value ( _query ( ',' _query )* )? ';'

media_statement ::=
	 '@media' _query ( ',' _query )* block

charset_statement ::=
	 '@charset' _value ';'

namespace_statement ::=
	 '@namespace' identifier? ( string_value | call_expression ) ';'

keyframes_statement ::=
	 ( '@keyframes' | '@'[-a-z]+'keyframes' ) identifier keyframe_block_list

keyframe_block_list ::=
	 '{' keyframe_block* '}'

keyframe_block ::=
	 ( from | to | integer_value ) block

from ::=
	 'from'

to ::=
	 'to'

supports_statement ::=
	 '@supports' _query block

postcss_statement ::=
	 at_keyword _value* ';'

at_rule ::=
	 at_keyword ( _query ( ',' _query )* )? ( ';' | block )

rule_set ::=
	 selectors block

selectors ::=
	 _selector ( ',' _selector )*

block ::=
	 '{' _block_item* last_declaration? '}'

_block_item ::=
	 declaration
	| rule_set
	| import_statement
	| media_statement
	| charset_statement
	| namespace_statement
	| keyframes_statement
	| supports_statement
	| postcss_statement
	| at_rule

_selector ::=
	 universal_selector
	| identifier
	| class_selector
	| nesting_selector
	| pseudo_class_selector
	| pseudo_element_selector
	| id_selector
	| attribute_selector
	| string_value
	| child_selector
	| descendant_selector
	| sibling_selector
	| adjacent_sibling_selector
	| namespace_selector

nesting_selector ::=
	 '&'

universal_selector ::=
	 '*'

class_selector ::=
	 _selector? '.' identifier

pseudo_class_selector ::=
	 _selector? _pseudo_class_selector_colon identifier pseudo_class_arguments?

pseudo_element_selector ::=
	 _selector? '::' identifier pseudo_element_arguments?

id_selector ::=
	 _selector? '#' identifier

attribute_selector ::=
	 _selector? '[' ( identifier | namespace_selector ) ( ( '=' | '~=' | '^=' | '|=' | '*=' | '$=' ) _value )? ']'

child_selector ::=
	 _selector '>' _selector

descendant_selector ::=
	 _selector _descendant_operator _selector

sibling_selector ::=
	 _selector '~' _selector

adjacent_sibling_selector ::=
	 _selector '+' _selector

namespace_selector ::=
	 _selector '|' _selector

pseudo_class_arguments ::=
	 '(' ( ( _selector | _value+ ) ( ',' ( _selector | _value+ ) )* )? ')'

pseudo_element_arguments ::=
	 '(' ( ( _selector | _value+ ) ( ',' ( _selector | _value+ ) )* )? ')'

declaration ::=
	 identifier ':' _value ( ','? _value )* important? ';'

last_declaration ::=
	 identifier ':' _value ( ','? _value )* important?

important ::=
	 '!important'

_query ::=
	 identifier
	| feature_query
	| binary_query
	| unary_query
	| selector_query
	| parenthesized_query

feature_query ::=
	 '(' identifier ':' _value+ ')'

parenthesized_query ::=
	 '(' _query ')'

binary_query ::=
	 _query ( 'and' | 'or' ) _query

unary_query ::=
	 ( 'not' | 'only' ) _query

selector_query ::=
	 'selector' '(' _selector ')'

_value ::=
	 identifier | plain_value | color_value | integer_value | float_value | string_value | grid_value | binary_expression | parenthesized_value | call_expression | important

parenthesized_value ::=
	 '(' _value ')'

color_value ::=
	 '#' [0-9a-fA-F]'{3,8}'

string_value ::=
	 "'"  ([^'#x0A]|"\"("."|"#x0A"))* "'" 
	| '"'  ([^"#x0A]|'\'('.'|'#x0A'))* '"' 

integer_value ::=
	 ( ( '+' | '-' )? [0-9]+ ) unit?

float_value ::=
	 ( ( '+' | '-' )? [0-9]* ( '.' [0-9]+ | [eE] '-'? [0-9]+ | '.' [0-9]+ [eE] '-'? [0-9]+ ) ) unit?

unit ::=
	 [a-zA-Z%]+

grid_value ::=
	 '[' _value ( ',' _value )* ']'

call_expression ::=
	 identifier arguments

binary_expression ::=
	 _value ( '+' | '-' | '*' | '/' ) _value

arguments ::=
	 '(' ( _value+ ( ( ',' | ';' ) _value+ )* )? ')'

identifier ::=
	 ('--'|'-'?[a-zA-Z_])[a-zA-Z0-9-_]*

at_keyword ::=
	 '@'[a-zA-Z-_]+

js_comment ::=
	 '//' '.'*

comment ::=
	 ( '/*' [^*]*'\'*+([^/*][^*]*'\'*+)* '/' )

plain_value ::=
	 ( ( [-_] | '\/'[^\* #x09#x0A#x0B#x0C#x0D,;!{}()#x5B#x5D] )* [a-zA-Z] ( [^/ #x09#x0A#x0B#x0C#x0D,;!{}()#x5B#x5D] | '\/'[^\* #x09#x0A#x0B#x0C#x0D,;!{}()#x5B#x5D] )* )