tokens.go

/*
 * Copyright 2017-2018 Dgraph Labs, Inc. and Contributors
 *
 * 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 tok

import (
	"github.com/dgraph-io/dgraph/x"
)

func GetLangTokenizer(t Tokenizer, lang string) Tokenizer {
	if lang == "" {
		return t
	}
	switch t.(type) {
	case FullTextTokenizer:
		// we must return a new instance because another goroutine might be calling this
		// with a different lang.
		return FullTextTokenizer{lang: lang}
	}
	return t
}

func GetTermTokens(funcArgs []string) ([]string, error) {
	if l := len(funcArgs); l != 1 {
		return nil, x.Errorf("Function requires 1 arguments, but got %d", l)
	}
	return BuildTokens(funcArgs[0], TermTokenizer{})
}

func GetFullTextTokens(funcArgs []string, lang string) ([]string, error) {
	if l := len(funcArgs); l != 1 {
		return nil, x.Errorf("Function requires 1 arguments, but got %d", l)
	}
	return BuildTokens(funcArgs[0], FullTextTokenizer{lang: lang})
}

func GetMatchTokens(funcArgs []string) ([]string, error) {
	if l := len(funcArgs); l != 1 {
		return nil, x.Errorf("Function requires 1 arguments, but got %d", l)
	}
	return BuildTokens(funcArgs[0], TrigramTokenizer{})
}