Function filterOnStandardFn

worker/task.go:2362–2399

filterOnStandardFn : tells whether facet corresponding to fcTokens can be taken or not. fcTokens and argTokens should be sorted.

(fname string, fcTokens []string, argTokens []string)

// filterOnStandardFn : tells whether facet corresponding to fcTokens can be taken or not.
// fcTokens and argTokens should be sorted.
func filterOnStandardFn(fname string, fcTokens []string, argTokens []string) (bool, error) {
	switch fname {
	case "allofterms":
		// allofterms argTokens should be in fcTokens
		if len(argTokens) > len(fcTokens) {
			return false, nil
		}
		aidx := 0
	loop:
		for fidx := 0; aidx < len(argTokens) && fidx < len(fcTokens); {
			switch {
			case fcTokens[fidx] < argTokens[aidx]:
				fidx++
			case fcTokens[fidx] == argTokens[aidx]:
				fidx++
				aidx++
			default:
				// as all of argTokens should match
				// which is not possible now.
				break loop
			}
		}
		return aidx == len(argTokens), nil
	case "anyofterms":
		for aidx, fidx := 0, 0; aidx < len(argTokens) && fidx < len(fcTokens); {
			switch {
			case fcTokens[fidx] < argTokens[aidx]:
				fidx++
			case fcTokens[fidx] == argTokens[aidx]:
				return true, nil
			default:
				aidx++
			}
		}
		return false, nil
	}
	return false, errors.Errorf("Fn %s not supported in facets filtering.", fname)
}

type facetsFunc struct {
	name   string