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syntax.ebnf
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syntax.ebnf
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digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ;
lowercase letter = "a" | "b" | "c" | "d" | "e" | "f" | "g"
| "h" | "i" | "j" | "k" | "l" | "m" | "n"
| "o" | "p" | "q" | "r" | "s" | "t" | "u"
| "v" | "w" | "x" | "y" | "z" ;
uppercase letter = "A" | "B" | "C" | "D" | "E" | "F" | "G"
| "H" | "I" | "J" | "K" | "L" | "M" | "N"
| "O" | "P" | "Q" | "R" | "S" | "T" | "U"
| "V" | "W" | "X" | "Y" | "Z"
letter = lowercase letter | uppercase letter;
number = [ "-" ] , { digit }+ , [ "." { digit }+ ] ;
identifier = lowercase letter | underscore, { letter | digit } ;
operator = "*" | "/" | "%" | "+" | "-" | "<<" | ">>"
| "<" | ">" | "<=" | ">=" | "==" | "!=" | "&"
| "^" | "|" | "&&" | "||"
constant = "pi" | "e" | "tau" | "true" | "false"
function = identifier, "(" param list ")"
param list = ( ) | ( operand { ",", operand } )
operand = number | constant | function
expression = { operand, operator }, operand