61 lines
1.4 KiB
Plaintext
61 lines
1.4 KiB
Plaintext
@preprocessor typescript
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@{%
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import { Expr } from "./parsed";
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%}
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expr -> term {% id %}
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term -> term _ "+" _ factor
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{% ([left, _0, _1, _2, right]): Expr =>
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({ exprType: "binary", binaryType: "add", left, right }) %}
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| term _ "-" _ factor
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{% ([left, _0, _1, _2, right]): Expr =>
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({ exprType: "binary", binaryType: "subtract", left, right }) %}
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| factor {% id %}
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factor -> factor _ "*" _ unary
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{% ([left, _0, _1, _2, right]): Expr =>
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({ exprType: "binary", binaryType: "multiply", left, right }) %}
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| factor _ "/" _ unary
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{% ([left, _0, _1, _2, right]): Expr =>
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({ exprType: "binary", binaryType: "divide", left, right }) %}
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| unary {% id %}
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unary -> "+" _ unary
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{% ([_0, _1, subject]): Expr =>
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({ exprType: "unary", unaryType: "plus", subject }) %}
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| "-" _ unary
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{% ([_0, _1, subject]): Expr =>
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({ exprType: "unary", unaryType: "negate", subject }) %}
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| operand {% id %}
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operand -> int {% id %}
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| group {% id %}
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| block {% id %}
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| if {% id %}
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int -> [0-9]:+
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{% ([token]): Expr =>
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({ exprType: "int", value: parseInt(token.join("")) }) %}
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group -> "(" _ expr _ ")" {% (v): Expr => v[2] %}
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block -> "{" _ expr _ "}" {% (v): Expr => ({ exprType: "block", expr: v[2] }) %}
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if -> "if" __ expr _ block _ "else" _ block
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{%
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(v): Expr => ({
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exprType: "if",
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condition: v[2],
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truthy: v[4],
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falsy: v[8]
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})
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%}
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_ -> __:?
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__ -> ws:+
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ws -> [ \t\r\n]
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