// Clear - Removes all context variables except those defined in `context` argument.
func Clear(ctx action.Map) (action.Map, error) {
leave := ctx.Pull("context")
// If `context` argument is empty -- clear entire context
if leave.IsNil() {
return action.Map{}, nil
}
// If `context` is a map -- it's a new context
if clean, ok := leave.Map(); ok {
return clean, nil
}
// If `context` is a string -- leave one variable
if name, ok := leave.String(); ok {
// Pop value
value := ctx.Pop(name).Value
// Close old context
ctx.Close()
return action.Map{name: value}, nil
}
// If `context` is a list -- create a new context and close old one
list, _ := ctx.Pull("context").StringList()
clean := make(action.Map)
// Save all values from list
for _, name := range list {
value := ctx.Pop(name).Value
clean.Add(name, value)
}
// Close old context
ctx.Close()
return clean, nil
}
