Exemplo n.º 1
0
func operateStrings(op lex.Token, av, bv value.StringValue) value.Value {

	//  Any other ops besides eq/not ?
	a, b := av.Val(), bv.Val()
	switch op.T {
	case lex.TokenEqualEqual, lex.TokenEqual: //  ==
		//u.Infof("==?  %v  %v", av, bv)
		if a == b {
			return value.BoolValueTrue
		}
		return value.BoolValueFalse

	case lex.TokenNE: //  !=
		//u.Infof("!=?  %v  %v", av, bv)
		if a == b {
			return value.BoolValueFalse
		}
		return value.BoolValueTrue

	case lex.TokenLike: // a(value) LIKE b(pattern)
		match, err := glob.Match(b, a)
		if err != nil {
			value.NewErrorValuef("invalid LIKE pattern: %q", a)
		}
		if match {
			return value.BoolValueTrue
		}
		return value.BoolValueFalse
	}
	return value.NewErrorValuef("unsupported operator for strings: %s", op.T)
}
Exemplo n.º 2
0
func LikeCompare(a, b string) (value.BoolValue, bool) {
	// Do we want to always do this replacement?   Or do this at parse time or config?
	if strings.Contains(b, "%") {
		b = strings.Replace(b, "%", "*", -1)
	}
	match, err := glob.Match(b, a)
	//u.Debugf("ran LIKE: match?%v err=%v  expr:  %s LIKE %s", match, err, b, a)
	if err != nil {
		//u.Warnf("invalid like: %q", a)
		return value.BoolValueFalse, false
	}
	if match {
		return value.BoolValueTrue, true
	}
	return value.BoolValueFalse, true
}
Exemplo n.º 3
0
// FilterFunc  Filter out Values that match specified list of match filter criteria
//
//   - Operates on MapValue (map[string]interface{}), StringsValue ([]string), or string
//   - takes N Filter Criteria
//   - supports Matching:      "filter*" // matches  "filter_x", "filterstuff"
//
//  -- Filter a map of values by key to remove certain keys
//    filter(match("topic_"),key_to_filter, key2_to_filter)  => {"goodkey": 22}, true
//
// -- Filter out VALUES (not keys) from a list of []string{} for a specific value
//    filter(split("apples,oranges",","),"ora*")  => ["apples"], true
//
// -- Filter out values for single strings
//    filter("apples","app*")      => []string{}, true
//
func FilterFunc(ctx expr.EvalContext, val value.Value, filterVals ...value.Value) (value.Value, bool) {

	filters := FiltersFromArgs(filterVals)

	//u.Debugf("Filter():  %T:%v   filters:%v", val, val, filters)
	switch val := val.(type) {
	case value.MapValue:

		mv := make(map[string]interface{})

		for rowKey, v := range val.Val() {
			filteredOut := false
			for _, filter := range filters {
				if strings.Contains(filter, "*") {
					match, _ := glob.Match(filter, rowKey)
					if match {
						filteredOut = true
						break
					}
				} else {
					if strings.HasPrefix(rowKey, filter) && v != nil {
						filteredOut = true
						break
					}
				}
			}
			if !filteredOut {
				mv[rowKey] = v.Value()
			}
		}

		return value.NewMapValue(mv), true

	case value.StringValue:
		anyMatches := false
		for _, filter := range filters {
			if strings.Contains(filter, "*") {
				match, _ := glob.Match(filter, val.Val())
				if match {
					anyMatches = true
					break
				}
			} else {
				if strings.HasPrefix(val.Val(), filter) {
					anyMatches = true
					break
				}
			}
		}
		if anyMatches {
			return value.NilValueVal, true
		}
		return val, true
	case value.StringsValue:
		lv := make([]string, 0, val.Len())
		for _, sv := range val.Val() {
			filteredOut := false
			for _, filter := range filters {
				if strings.Contains(filter, "*") {
					match, _ := glob.Match(filter, sv)
					if match {
						filteredOut = true
						break
					}
				} else {
					if strings.HasPrefix(sv, filter) && sv != "" {
						filteredOut = true
						break
					}
				}
			}
			if !filteredOut {
				lv = append(lv, sv)
			}
		}

		return value.NewStringsValue(lv), true

	default:
		u.Warnf("unsuported key type: %T %v", val, val)
	}

	//u.Warnf("could not find key: %T %v", item, item)
	return nil, false
}