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ltrim.go
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ltrim.go
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// 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/doltgresql/server/functions/framework"
pgtypes "github.com/dolthub/doltgresql/server/types"
)
// initLtrim registers the functions to the catalog.
func initLtrim() {
framework.RegisterFunction(ltrim_varchar)
framework.RegisterFunction(ltrim_varchar_varchar)
}
// ltrim_varchar represents the PostgreSQL function of the same name, taking the same parameters.
var ltrim_varchar = framework.Function1{
Name: "ltrim",
Return: pgtypes.VarChar,
Parameters: []pgtypes.DoltgresType{pgtypes.VarChar},
Callable: func(ctx framework.Context, val1 any) (any, error) {
return ltrim_varchar_varchar.Callable(ctx, val1, " ")
},
}
// ltrim_varchar_varchar represents the PostgreSQL function of the same name, taking the same parameters.
var ltrim_varchar_varchar = framework.Function2{
Name: "ltrim",
Return: pgtypes.VarChar,
Parameters: []pgtypes.DoltgresType{pgtypes.VarChar, pgtypes.VarChar},
Callable: func(ctx framework.Context, str any, characters any) (any, error) {
if str == nil || characters == nil {
return nil, nil
}
runes := []rune(str.(string))
trimChars := make(map[rune]struct{})
for _, c := range characters.(string) {
trimChars[c] = struct{}{}
}
trimIdx := 0
for ; trimIdx < len(runes); trimIdx++ {
if _, ok := trimChars[runes[trimIdx]]; !ok {
break
}
}
return string(runes[trimIdx:]), nil
},
}