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95 lines
1.9 KiB
Markdown
95 lines
1.9 KiB
Markdown
```haskell
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Expr :=
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LogicalExpr | NIL
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LogicalExpr :=
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LogicalExpr BinaryLogicalOp LogicalExpr
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| UnaryLogicalOp LogicalExpr
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| "(" LogicalExpr ")"
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| SingleExpr
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BinaryLogicalOp :=
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"&&" | "and"
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| "||" | "or"
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UnaryLogicalOp :=
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"not"
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SingleExpr :=
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TermExpr
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| CompareExpr
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TermExpr :=
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IDENTIFIER "in" ConstantArray
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ConstantArray :=
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"[" ConstantExpr { "," ConstantExpr } "]"
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ConstantExpr :=
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Constant
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| ConstantExpr BinaryArithOp ConstantExpr
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| UnaryArithOp ConstantExpr
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Constant :=
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INTERGER
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| FLOAT_NUMBER
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UnaryArithOp :=
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"+"
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| "-"
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BinaryArithOp :=
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"+"
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| "-"
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| "*"
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| "/"
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| "%"
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| "**"
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CompareExpr :=
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IDENTIFIER CmpOp IDENTIFIER
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| IDENTIFIER CmpOp ConstantExpr
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| ConstantExpr CmpOp IDENTIFIER
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| ConstantExpr CmpOpRestricted IDENTIFIER CmpOpRestricted ConstantExpr
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CmpOpRestricted :=
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"<"
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| "<="
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CmpOp :=
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">"
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| ">="
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| "<"
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| "<="
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| "=="
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| "!="
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INTERGER := 整数
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FLOAT_NUM := 浮点数
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IDENTIFIER := 列名
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```
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Tips:
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1. NIL represents an empty string, which means there is no Predicate for Expr.
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2. Gramma is described by EBNF syntax，expressions that may be omitted or repeated are represented through curly braces `{...}`.
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After syntax analysis, the following rules will be applied:
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1. non-vector column must exist in Schema.
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2. CompareExpr/TermExpr requires operand type matching.
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3. CompareExpr between non-vector columns of different types is available.
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4. The modulo operation requires all operands to be integers.
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5. Integer columns can only match integer operands. While float columns can match both integer and float operands.
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6. In BinaryOp, the `and`/`&&` operator has higher priority than the `or`/`||` operator.
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Example：
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```python
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A > 3 && A < 4 && (C > 5 || D < 6)
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1 < A <= 2.0 + 3 - 4 * 5 / 6 % 7 ** 8
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A == B
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FloatCol in [1.0, 2, 3.0]
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Int64Col in [1, 2, 3] or C != 6
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```
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