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package script
import (
"go/ast"
"go/token"
"reflect"
)
func (w *World) compileIncDecStmt(n *ast.IncDecStmt) Expr {
l := w.compileLvalue(n.X)
switch n.Tok {
case token.INC:
rhs_plus1 := &addone{incdec{typeConv(n.Pos(), l, float64_t)}}
return &assignStmt{lhs: l, rhs: typeConv(n.Pos(), rhs_plus1, l.Type())}
case token.DEC:
rhs_minus1 := &subone{incdec{typeConv(n.Pos(), l, float64_t)}}
return &assignStmt{lhs: l, rhs: typeConv(n.Pos(), rhs_minus1, l.Type())}
default:
panic(err(n.Pos(), "not allowed:", n.Tok))
}
}
type incdec struct{ x Expr }
func (e *incdec) Type() reflect.Type { return float64_t }
func (e *incdec) Child() []Expr { return []Expr{e.x} }
func (e *incdec) Fix() Expr { panic(invalid_closure) }
type addone struct{ incdec }
type subone struct{ incdec }
func (s *addone) Eval() interface{} { return s.x.Eval().(float64) + 1 }
func (s *subone) Eval() interface{} { return s.x.Eval().(float64) - 1 }
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