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expr_logical.go
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/
expr_logical.go
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package rel
import (
"fmt"
"github.com/arr-ai/wbnf/parser"
)
type AndExpr struct {
ExprScanner
a, b Expr
}
func NewAndExpr(scanner parser.Scanner, a, b Expr) Expr {
return AndExpr{ExprScanner: ExprScanner{Src: scanner}, a: a, b: b}
}
func (e AndExpr) String() string {
return fmt.Sprintf("(%v) && (%v)", e.a, e.b)
}
func (e AndExpr) Eval(local Scope) (Value, error) {
a, err := e.a.Eval(local)
if err != nil {
return nil, WrapContext(err, e, local)
}
if !a.IsTrue() {
return a, nil
}
b, err := e.b.Eval(local)
if err != nil {
return nil, WrapContext(err, e, local)
}
return b, nil
}
type OrExpr struct {
ExprScanner
a, b Expr
}
func NewOrExpr(scanner parser.Scanner, a, b Expr) Expr {
return OrExpr{ExprScanner: ExprScanner{Src: scanner}, a: a, b: b}
}
func (e OrExpr) String() string {
return fmt.Sprintf("(%v) || (%v)", e.a, e.b)
}
func (e OrExpr) Eval(local Scope) (Value, error) {
a, err := e.a.Eval(local)
if err != nil {
return nil, WrapContext(err, e, local)
}
if a.IsTrue() {
return a, nil
}
b, err := e.b.Eval(local)
if err != nil {
return nil, WrapContext(err, e, local)
}
return b, nil
}