truth

一个布尔表达式解析器和评估器。

示例

表达式：!A

> Truth table:
A    Result

0    1
1    0
> Parsed tree:
Operation { components: [Component { value: Var(A), negated: true }], ops: [] }
> Variables: [A]

表达式：X & Y

> Truth table:
X    Y    Result

0    0    0
0    1    0
1    0    0
1    1    1
> Parsed tree:
Operation { components: [Component { value: Var(X), negated: false }, Component { value: Var(Y), negated: false }], ops: [Token { token_type: And, col: 3, line: 1 }] }
> Variables: [X, Y]

表达式：(A & B) | (C ^ D)

> Truth table:
A    B    C    D    Result

0    0    0    0    0
0    0    0    1    1
0    0    1    0    1
0    0    1    1    0
0    1    0    0    0
0    1    0    1    1
0    1    1    0    1
0    1    1    1    0
1    0    0    0    0
1    0    0    1    1
1    0    1    0    1
1    0    1    1    0
1    1    0    0    1
1    1    0    1    1
1    1    1    0    1
1    1    1    1    1
> Parsed tree:
Operation { components: [Component { value: Expr(Operation { components: [Component { value: Var(A), negated: false }, Component { value: Var(B), negated: false }], ops: [Token { token_type: And, col: 4, line: 1 }] }), negated: false }, Component { value: Expr(Operation { components: [Component { value: Var(C), negated: false }, Component { value: Var(D), negated: false }], ops: [Token { token_type: Xor, col: 14, line: 1 }] }), negated: false }], ops: [Token { token_type: Or, col: 9, line: 1 }] }
> Variables: [A, B, C, D]

注意：与（&）、或（|）和异或（^）运算符具有相同的优先级。