forgejo/vendor/github.com/blevesearch/bleve/registry/highlighter.go
2017-01-25 10:43:02 +08:00

90 lines
2.6 KiB
Go
Vendored

// Copyright (c) 2014 Couchbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package registry
import (
"fmt"
"github.com/blevesearch/bleve/search/highlight"
)
func RegisterHighlighter(name string, constructor HighlighterConstructor) {
_, exists := highlighters[name]
if exists {
panic(fmt.Errorf("attempted to register duplicate highlighter named '%s'", name))
}
highlighters[name] = constructor
}
type HighlighterConstructor func(config map[string]interface{}, cache *Cache) (highlight.Highlighter, error)
type HighlighterRegistry map[string]HighlighterConstructor
type HighlighterCache struct {
*ConcurrentCache
}
func NewHighlighterCache() *HighlighterCache {
return &HighlighterCache{
NewConcurrentCache(),
}
}
func HighlighterBuild(name string, config map[string]interface{}, cache *Cache) (interface{}, error) {
cons, registered := highlighters[name]
if !registered {
return nil, fmt.Errorf("no highlighter with name or type '%s' registered", name)
}
highlighter, err := cons(config, cache)
if err != nil {
return nil, fmt.Errorf("error building highlighter: %v", err)
}
return highlighter, nil
}
func (c *HighlighterCache) HighlighterNamed(name string, cache *Cache) (highlight.Highlighter, error) {
item, err := c.ItemNamed(name, cache, HighlighterBuild)
if err != nil {
return nil, err
}
return item.(highlight.Highlighter), nil
}
func (c *HighlighterCache) DefineHighlighter(name string, typ string, config map[string]interface{}, cache *Cache) (highlight.Highlighter, error) {
item, err := c.DefineItem(name, typ, config, cache, HighlighterBuild)
if err != nil {
if err == ErrAlreadyDefined {
return nil, fmt.Errorf("highlighter named '%s' already defined", name)
}
return nil, err
}
return item.(highlight.Highlighter), nil
}
func HighlighterTypesAndInstances() ([]string, []string) {
emptyConfig := map[string]interface{}{}
emptyCache := NewCache()
var types []string
var instances []string
for name, cons := range highlighters {
_, err := cons(emptyConfig, emptyCache)
if err == nil {
instances = append(instances, name)
} else {
types = append(types, name)
}
}
return types, instances
}