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let opt(x) = _ | x;
let plus(x) = [plus](x . opt(plus));
let star(x) = opt(plus(x));
let star_(base, step) = [rec](base | step . rec);
let Pattern_Whitespace = "\t"|"\n"|"\x0B"|"\x0c"|"\r"|" "|"\u{85}"|"\u{200e}"|"\u{200f}"|"\u{2028}"|"\u{2029}";
let oct_digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" ;
let digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9";
let hex_digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" |
"a" | "b" | "c" | "d" | "e" | "f" |
"A" | "B" | "C" | "D" | "E" | "F" ;
let XID_Start =
"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" |
"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" ;
let XID_Continue =
XID_Start | "_" | "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ;
let literal_char =
" " | "!" | "#" | "$" | "%" | "&" | "'" |
"(" | ")" | "*" | "+" | "," | "-" | "." | "/" |
"0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" |
"8" | "9" | ":" | ";" | "<" | "=" | ">" | "?" |
"@" | "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" | "[" | "]" | "^" | "_" |
"`" | "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" | "{" | "|" | "}" | "~" |
"\\" . ("\"" | "'" | "n" | "r" | "t" | "\\" | "0" |
"x" . oct_digit . hex_digit |
"u{" . hex_digit . opt(hex_digit . opt(hex_digit . opt(hex_digit . opt(hex_digit . opt(hex_digit))))) . "}");
let ws = plus(Pattern_Whitespace);
let punctuated(x, p) = [rec](x . opt(p . opt(ws) . rec));
let list(x) = "(" . opt(ws) . [rec](x . opt("," . opt(ws) . opt(rec))) . ")";
let epsilon = "_";
let ident = XID_Start . star(XID_Continue);
let literal = "\"" . plus(literal_char) . "\"";
let parens(expr) = "(" . opt(ws) . expr . ")";
let fix(expr) = "[" . opt(ws) . ident . opt(ws) . "]" . opt(ws) . parens(expr);
let term(expr) =
epsilon . opt(ws)
| literal . opt(ws)
| parens(expr) . opt(ws)
| fix(expr) . opt(ws)
| ident . opt(ws) . opt(list(expr) . opt(ws))
;
let seq(expr) = punctuated(term(expr), ".");
let alt(expr) = punctuated(seq(expr), "|");
let expr = [expr](alt(expr));
let let = "let" . ws . ident . opt(ws) . opt(list(ident . opt(ws)) . opt(ws)) . "=" . opt(ws) . expr . ";";
let goal = "match" . ws . expr . ";";
match star_(goal, let);
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