@import "css-value-unit.bbnf" ;
// CSS @keyframes grammar (CSS Animations Level 1).
// Spec: https://drafts.csswg.org/css-animations-1/#keyframes
// Imports numeric primitives from the canonical base grammar.
//
// Structure: @keyframes name { selector { prop: value; }* }
// Keyframe selectors can be percentages, "from"/"to", or comma-separated lists.
// Declaration model reuses standard CSS property:value pairs.
// Vendor-prefixed keyframe blocks (-webkit-, -moz-) are supported.
// --- Tokens ---
IDENT = /[a-zA-Z_][\w-]*/ ;
VENDOR_PREFIX = /-\w+-/ ;
STRING = /"(?:[^"\\]|\\[\s\S])*?"/ ;
HASH = /#[\w-]+/ ;
// --- Values ---
DIMENSION = number , IDENT ;
IMPORTANT_SYM = "!important" ;
UNICODE_RANGE = /u\+[0-9a-fA-F?]{1,6}(-[0-9a-fA-F]{1,6})?/ ;
// Functions: ident(...args...)
FUNCTION = IDENT , "(" >> (PROPERTY_VALUE ?w , ("," ?w >> PROPERTY_VALUE ?w) *) ?w << ")" ;
// --- Property values ---
PROPERTY_VALUE = FUNCTION | STRING | percentage | DIMENSION | HASH
| UNICODE_RANGE | IMPORTANT_SYM | number | IDENT ;
// --- Declarations ---
PROPERTY_NAME = IDENT ;
DECLARATION = (PROPERTY_NAME << ":" ?w) , PROPERTY_VALUE ;
DECLARATIONS_LIST = (DECLARATION ?w << ";" ?) + << ";" ? ;
// --- Keyframe blocks ---
FROM_TO_KEYWORD = "from" | "to" ;
KEYFRAME_SELECTOR = percentage | FROM_TO_KEYWORD | (percentage , ("," ?w >> percentage) +) ;
KEYFRAME_BLOCK = KEYFRAME_SELECTOR ?w , "{" ?w >> DECLARATIONS_LIST ?w << "}" ;
KEYFRAME_BLOCKS = (VENDOR_PREFIX ? , KEYFRAME_BLOCK ?w) + ;
// --- @keyframes rule ---
KEYFRAMES_NAME = IDENT | STRING ;
KEYFRAMES_RULE = ("@keyframes" ?w >> KEYFRAMES_NAME ?w , "{" ?w >> KEYFRAME_BLOCKS ?w << "}") ?w ;