Add support for bitwise operators

[ShengXiangXiong]

val := `1 & 1`
complie, err := expr.Compile(val)
r, err := expr.Run(complie,env)
if err!=nil {
fmt.Printf("%+v", err)
}
if v, ok := r.(int); ok {
fmt.Printf("%+v", v)
}

[antonmedv]

Nope, no bit operators.

[ShengXiangXiong]

Nope, no bit operators.

Can this feature be added in the future

[antonmedv]

Maybe.

[antonmedv]

I'm thinking to add bit ops with such functions:

• shl(int, int) – signed shift left
• shr(int, int) – signed shift right
• ushr(int, int) – unsigned shift right
• band(int, int) – bitwise AND
• bor(int, int) – bitwise OR
• xor(int) – bitwise XOR
• inv(int) – bitwise inversion

[lublak]

@antonmedv i think function is the solution.
The signs | and ^ are already used for something else.
It should not be used twice.

[antonmedv]

Now Expr supports bit operations. See https://expr-lang.org/docs/language-definition#bitwise-functions