43 lines
1.1 KiB
Plaintext
43 lines
1.1 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 -> "(" _ expr _ ")" {% ([_0, _1, expr]): Expr => expr %}
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| [0-9]:+
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{% ([token]): Expr =>
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({ exprType: "int", value: parseInt(token.join("")) }) %}
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_ -> __:?
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__ -> ws:+
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ws -> [ \t\r\n]
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