EBNF

EBNF

program = "Music", identifier, integer, "{", varials_block, instrument_block*, "}" ;

varials_block = "Varials", "{", varial_decl*, "}" ;

varial_decl = identifier, "=", (note_list | integer) ;

note_list = "[", integer, { ",", integer }, "]" ;

instrument_block = "Instrument", identifier, integer, "{", loop_block+, "}" ;

loop_block = "Loop", identifier, integer, "{", music_command+, "}" ;

music_command = chord_command | play_command ;

chord_command = "Chord", identifier, integer ;

play_command = "play", identifier, integer ;

identifier = letter, { letter | digit | "_" } ;

integer = digit, { digit } ;

letter = "A" .. "Z" | "a" .. "z" ;

digit = "0" .. "9" ;