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package ast
import (
"fmt"
"jinx/pkg/lang/scanner/token"
)
type BinOp int
const (
BinOpPlus BinOp = iota
BinOpMinus
BinOpStar
BinOpSlash
BinOpPercent
BinOpAssign
BinOpEq
BinOpNeq
BinOpLt
BinOpLte
BinOpGt
BinOpGte
)
func BinOpFromToken(tok token.Token) (BinOp, bool) {
var op BinOp
switch tok.Kind {
case token.Plus:
op = BinOpPlus
case token.Minus:
op = BinOpMinus
case token.Star:
op = BinOpStar
case token.Slash:
op = BinOpSlash
case token.Percent:
op = BinOpPercent
case token.Assign:
op = BinOpAssign
case token.Eq:
op = BinOpEq
case token.Neq:
op = BinOpNeq
case token.Lt:
op = BinOpLt
case token.Lte:
op = BinOpLte
case token.Gt:
op = BinOpGt
case token.Gte:
op = BinOpGte
default:
return 0, false
}
return op, true
}
func (op BinOp) Precedence() int {
switch op {
case BinOpAssign:
return 1
case BinOpEq, BinOpNeq, BinOpLt, BinOpLte, BinOpGt, BinOpGte:
return 2
case BinOpPlus, BinOpMinus:
return 3
case BinOpStar, BinOpSlash, BinOpPercent:
return 4
default:
panic(fmt.Sprintf("unknown binary operator: %d", op))
}
}
type Associativity int
const (
AssociativityLeft Associativity = iota
AssociativityRight
)
func (op BinOp) Associativity() Associativity {
switch op {
case BinOpPlus, BinOpMinus, BinOpStar, BinOpSlash, BinOpPercent:
return AssociativityLeft
case BinOpAssign:
return AssociativityRight
case BinOpEq, BinOpNeq, BinOpLt, BinOpLte, BinOpGt, BinOpGte:
return AssociativityLeft
default:
panic(fmt.Sprintf("unknown binary operator: %d", op))
}
}
type UnOp int
const (
UnOpBang UnOp = iota
UnOpMinus
)
func UnOpFromToken(tok token.Token) (UnOp, bool) {
var op UnOp
switch tok.Kind {
case token.Bang:
op = UnOpBang
case token.Minus:
op = UnOpMinus
default:
return 0, false
}
return op, true
}
|
