package cache import ( "fmt" "strings" "unicode" ) type Query struct { Filters OrderBy OrderDirection } // Return an identity query with default sorting (creation-desc) func NewQuery() *Query { return &Query{ OrderBy: OrderByCreation, OrderDirection: OrderDescending, } } // ParseQuery parse a query DSL // // Ex: "status:open author:descartes sort:edit-asc" // // Supported filter qualifiers and syntax are described in docs/queries.md func ParseQuery(query string) (*Query, error) { fields := splitQuery(query) result := &Query{ OrderBy: OrderByCreation, OrderDirection: OrderDescending, } sortingDone := false for _, field := range fields { split := strings.Split(field, ":") if len(split) != 2 { return nil, fmt.Errorf("can't parse \"%s\"", field) } qualifierName := split[0] qualifierQuery := removeQuote(split[1]) switch qualifierName { case "status", "state": f, err := StatusFilter(qualifierQuery) if err != nil { return nil, err } result.Status = append(result.Status, f) case "author": f := AuthorFilter(qualifierQuery) result.Author = append(result.Author, f) case "actor": f := ActorFilter(qualifierQuery) result.Actor = append(result.Actor, f) case "participant": f := ParticipantFilter(qualifierQuery) result.Participant = append(result.Participant, f) case "label": f := LabelFilter(qualifierQuery) result.Label = append(result.Label, f) case "title": f := TitleFilter(qualifierQuery) result.Title = append(result.Title, f) case "no": err := result.parseNoFilter(qualifierQuery) if err != nil { return nil, err } case "sort": if sortingDone { return nil, fmt.Errorf("multiple sorting") } err := result.parseSorting(qualifierQuery) if err != nil { return nil, err } sortingDone = true default: return nil, fmt.Errorf("unknow qualifier name %s", qualifierName) } } return result, nil } func splitQuery(query string) []string { lastQuote := rune(0) f := func(c rune) bool { switch { case c == lastQuote: lastQuote = rune(0) return false case lastQuote != rune(0): return false case unicode.In(c, unicode.Quotation_Mark): lastQuote = c return false default: return unicode.IsSpace(c) } } return strings.FieldsFunc(query, f) } func removeQuote(field string) string { if len(field) >= 2 { if field[0] == '"' && field[len(field)-1] == '"' { return field[1 : len(field)-1] } } return field } func (q *Query) parseNoFilter(query string) error { switch query { case "label": q.NoFilters = append(q.NoFilters, NoLabelFilter()) default: return fmt.Errorf("unknown \"no\" filter %s", query) } return nil } func (q *Query) parseSorting(query string) error { switch query { // default ASC case "id-desc": q.OrderBy = OrderById q.OrderDirection = OrderDescending case "id", "id-asc": q.OrderBy = OrderById q.OrderDirection = OrderAscending // default DESC case "creation", "creation-desc": q.OrderBy = OrderByCreation q.OrderDirection = OrderDescending case "creation-asc": q.OrderBy = OrderByCreation q.OrderDirection = OrderAscending // default DESC case "edit", "edit-desc": q.OrderBy = OrderByEdit q.OrderDirection = OrderDescending case "edit-asc": q.OrderBy = OrderByEdit q.OrderDirection = OrderAscending default: return fmt.Errorf("unknow sorting %s", query) } return nil }