// match: Match a simple pattern match and return matched value
//
// given input:
// {"score_value":24,"event_click":true}
//
// match("score_") => {"value":24}
// match("amount_") => false
// match("event_") => {"click":true}
//
func Match(ctx expr.EvalContext, items ...value.Value) (value.MapValue, bool) {
//u.Debugf("Match(): %T %v", item, item)
mv := make(map[string]interface{})
for _, item := range items {
switch node := item.(type) {
case value.StringValue:
matchKey := node.Val()
for rowKey, val := range ctx.Row() {
if strings.HasPrefix(rowKey, matchKey) && val != nil {
newKey := strings.Replace(rowKey, matchKey, "", 1)
if newKey != "" {
mv[newKey] = val
}
}
}
default:
u.Warnf("unsuported key type: %T %v", item, item)
}
}
if len(mv) > 0 {
//u.Infof("found new: %v", mv)
return value.NewMapValue(mv), true
}
//u.Warnf("could not find key: %T %v", item, item)
return value.EmptyMapValue, false
}
