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17 lines
729 B
Text
17 lines
729 B
Text
import Ostap;
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import Expr;
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import Fun;
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import List;
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local a = token ("a"),
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eq = [token ("="), fun (l, r) {Eq (l, r)}],
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add = [token ("+"), fun (l, r) {Add (l, r)}],
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sub = [token ("-"), fun (l, r) {Sub (l, r)}],
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mul = [token ("*"), fun (l, r) {Mul (l, r)}],
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div = [token ("/"), fun (l, r) {Div (l, r)}],
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exp = expr ({[Nona, singleton (eq)], [Right, {add, sub}], [Left, {mul, div}]}, a) (id);
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printf ("%s\n", parseString (exp |> bypass (eof), "a=a").string);
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printf ("%s\n", parseString (exp |> bypass (eof), "a*a=a*a").string);
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printf ("%s\n", parseString (exp |> bypass (eof), "a*a+a/a-a*a=a*a-a").string);
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printf ("%s\n", parseString (exp |> bypass (eof), "a=a=a+a").string)
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