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|
package cache
import (
"fmt"
"strings"
"unicode"
)
type Query struct {
Filters
OrderBy
OrderDirection
}
// ParseQuery parse a query DSL
//
// Ex: "status:open author:descartes sort:edit-asc"
//
// Supported filter fields 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 "label":
f := LabelFilter(qualifierQuery)
result.Label = append(result.Label, 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")
}
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
}
|
