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or.go
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or.go
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package ast
import (
"fmt"
"github.com/NicoNex/tau/internal/code"
"github.com/NicoNex/tau/internal/compiler"
"github.com/NicoNex/tau/internal/obj"
)
type Or struct {
l Node
r Node
pos int
}
func NewOr(l, r Node, pos int) Node {
return Or{
l: l,
r: r,
pos: pos,
}
}
func (o Or) Eval() (obj.Object, error) {
left, err := o.l.Eval()
if err != nil {
return obj.NullObj, err
}
right, err := o.r.Eval()
if err != nil {
return obj.NullObj, err
}
return obj.ParseBool(obj.IsTruthy(left) || obj.IsTruthy(right)), nil
}
func (o Or) String() string {
return fmt.Sprintf("(%v || %v)", o.l, o.r)
}
func (o Or) Compile(c *compiler.Compiler) (position int, err error) {
if o.IsConstExpression() {
object, err := o.Eval()
if err != nil {
return 0, c.NewError(o.pos, err.Error())
}
position = c.Emit(code.OpConstant, c.AddConstant(object))
c.Bookmark(o.pos)
return position, err
}
if position, err = o.l.Compile(c); err != nil {
return
}
if position, err = o.r.Compile(c); err != nil {
return
}
position = c.Emit(code.OpOr)
c.Bookmark(o.pos)
return
}
func (o Or) IsConstExpression() bool {
return o.l.IsConstExpression() && o.r.IsConstExpression()
}