39 lines
811 B
Go
39 lines
811 B
Go
// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
|
|
// All rights reserved.
|
|
|
|
// operator-iter-value.go
|
|
package expr
|
|
|
|
//-------- iter value term
|
|
|
|
func newIterValueTerm(tk *Token) (inst *term) {
|
|
return &term{
|
|
tk: *tk,
|
|
children: make([]*term, 0, 1),
|
|
position: posPrefix,
|
|
priority: priDereference,
|
|
evalFunc: evalIterValue,
|
|
}
|
|
}
|
|
|
|
func evalIterValue(ctx ExprContext, opTerm *term) (v any, err error) {
|
|
var childValue any
|
|
|
|
if childValue, err = opTerm.evalPrefix(ctx); err != nil {
|
|
return
|
|
}
|
|
|
|
if it, ok := childValue.(Iterator); ok {
|
|
v, err = it.Current()
|
|
} else {
|
|
err = opTerm.errIncompatibleType(childValue)
|
|
}
|
|
return
|
|
}
|
|
|
|
// init
|
|
func init() {
|
|
// registerTermConstructor(SymOpenClosedRound, newIterValueTerm)
|
|
registerTermConstructor(SymDereference, newIterValueTerm)
|
|
}
|