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|
package cache
import (
"fmt"
"strings"
)
type Query struct {
Filters
OrderBy
OrderDirection
}
// ParseQuery parse a query DSL
//
// Ex: "status:open author:descartes sort:edit-asc"
//
// Supported filter fields are:
// - status:
// - author:
// - label:
// - no:
//
// Sorting is done with:
// - sort:
//
// Todo: write a complete doc
func ParseQuery(query string) (*Query, error) {
fields := strings.Fields(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)
}
switch split[0] {
case "status":
f, err := StatusFilter(split[1])
if err != nil {
return nil, err
}
result.Status = append(result.Status, f)
case "author":
f := AuthorFilter(split[1])
result.Author = append(result.Author, f)
case "label":
f := LabelFilter(split[1])
result.Label = append(result.Label, f)
case "no":
err := result.parseNoFilter(split[1])
if err != nil {
return nil, err
}
case "sort":
if sortingDone {
return nil, fmt.Errorf("multiple sorting")
}
err := result.parseSorting(split[1])
if err != nil {
return nil, err
}
sortingDone = true
default:
return nil, fmt.Errorf("unknow query field %s", split[0])
}
}
return result, nil
}
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
}
|
