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highlighter.go
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highlighter.go
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// 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/acgshare/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 map[string]highlight.Highlighter
func (c HighlighterCache) HighlighterNamed(name string, cache *Cache) (highlight.Highlighter, error) {
highlighter, cached := c[name]
if cached {
return highlighter, nil
}
highlighterConstructor, registered := highlighters[name]
if !registered {
return nil, fmt.Errorf("no highlighter with name or type '%s' registered", name)
}
highlighter, err := highlighterConstructor(nil, cache)
if err != nil {
return nil, fmt.Errorf("error building highlighter: %v", err)
}
c[name] = highlighter
return highlighter, nil
}
func (c HighlighterCache) DefineHighlighter(name string, typ string, config map[string]interface{}, cache *Cache) (highlight.Highlighter, error) {
_, cached := c[name]
if cached {
return nil, fmt.Errorf("highlighter named '%s' already defined", name)
}
highlighterConstructor, registered := highlighters[typ]
if !registered {
return nil, fmt.Errorf("no highlighter type '%s' registered", typ)
}
highlighter, err := highlighterConstructor(config, cache)
if err != nil {
return nil, fmt.Errorf("error building highlighter: %v", err)
}
c[name] = highlighter
return highlighter, nil
}
func HighlighterTypesAndInstances() ([]string, []string) {
emptyConfig := map[string]interface{}{}
emptyCache := NewCache()
types := make([]string, 0)
instances := make([]string, 0)
for name, cons := range highlighters {
_, err := cons(emptyConfig, emptyCache)
if err == nil {
instances = append(instances, name)
} else {
types = append(types, name)
}
}
return types, instances
}