55 lines
2.1 KiB
Plaintext
55 lines
2.1 KiB
Plaintext
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program = ws*, expression, ws*, { expression, ws* }
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block = "[", program, "]" ;
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(* At interpreter runtime it is determined which symbols pass as operators, and which not *)
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expression = value, ws*, operator, ws*, expression
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| operator, ws*, value
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| value ;
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value = note
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| chord
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| symbol
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| block
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| number
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| ( "(", expression, ")" ) ;
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symbol = ( valid-symbol-start-characters, { valid-symbol-characters } ) - note - chord;
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valid-symbol-start-characters = uniletter | "_" | "@" | "$" | "#" ;
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valid-symbol-characters = valid-symbol-start-characters | unidigit | "-" ;
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operator = operator-symbols, { operator-symbols } ;
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operator-symbols = "+" | "-" | "*" | "/" | "%" | "!"
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| "<" | ">" | "v" | "^" | "=" | ":" ;
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(********************************* Literały liczbowe *********************************)
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number = floating-point | fraction ;
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(* Dopuszcza następujące zapisy: 1/2, *)
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fraction = digits+, ws*, "/", ws*, digits+ ;
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(* Dopuszcza następujące zapisy: -123.456, 123.456, .456; Notacja naukowa nie jest wspierana *)
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floating-point = ( ["-"], digits+, [ ".", digits+ ] ) | ( ".", digits+ );
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(********************************* Literały muzyczne *********************************)
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(* DSL do definiowania muzycznych wartości. Brakuje notacji dla akordów, przewrotów itd *)
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note = note-letter, ["#"], [ws*, octave] ;
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note-letter = "c" | "C" | "d" | "D" | "e" | "E" | "f" | "F" | "g" | "G" | "a" | "A" | "h" | "H" | "b" | "B" ;
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octave = "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" ;
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chord = note-letter, ["#"], [ ("1" | "2" | "5" | "7" ), [ "," | "'" ] ];
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(********************************* Definicje pomocnicze *********************************)
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(* Unicode helpers, based on Go's compiler source code *)
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uniletter = ? all characters that are considered letters in unicode ?;
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unidigit = ? all characters that are considered digits in unicode ?;
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digits+ = digit, { digits } ;
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digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ;
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(* Whitespace helpers *)
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ws* = { ws } ;
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ws+ = ws, { ws } ;
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ws = ? all characters that are considered ascii whitespace ? ;
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