wehub-resource-sync
43 lines
1.4 KiB
Go
43 lines
1.4 KiB
Go
// Copyright 2024 Dolthub, 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 functions
|
|
|
|
import (
|
|
"github.com/dolthub/go-mysql-server/sql"
|
|
|
|
"github.com/dolthub/doltgresql/server/functions/framework"
|
|
pgtypes "github.com/dolthub/doltgresql/server/types"
|
|
)
|
|
|
|
// initReverse registers the functions to the catalog.
|
|
func initReverse() {
|
|
framework.RegisterFunction(reverse_text)
|
|
}
|
|
|
|
// reverse_text represents the PostgreSQL function of the same name, taking the same parameters.
|
|
var reverse_text = framework.Function1{
|
|
Name: "reverse",
|
|
Return: pgtypes.Text,
|
|
Parameters: [1]*pgtypes.DoltgresType{pgtypes.Text},
|
|
Strict: true,
|
|
Callable: func(ctx *sql.Context, _ [2]*pgtypes.DoltgresType, val1 any) (any, error) {
|
|
runes := []rune(val1.(string))
|
|
for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
|
|
runes[i], runes[j] = runes[j], runes[i]
|
|
}
|
|
return string(runes), nil
|
|
},
|
|
}
|