wehub-resource-sync
52 lines
1.6 KiB
Go
52 lines
1.6 KiB
Go
// Copyright 2024 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package functions
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import (
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"unicode/utf8"
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"github.com/cockroachdb/errors"
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/doltgresql/server/functions/framework"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// initChr registers the functions to the catalog.
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func initChr() {
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framework.RegisterFunction(chr_int32)
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}
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// chr_int32 represents the PostgreSQL function of the same name, taking the same parameters.
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var chr_int32 = framework.Function1{
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Name: "chr",
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Return: pgtypes.Text,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Int32},
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Strict: true,
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Callable: func(ctx *sql.Context, _ [2]*pgtypes.DoltgresType, val1Interface any) (any, error) {
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val1 := val1Interface.(int32)
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if val1 == 0 {
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return nil, errors.Errorf("null character not permitted")
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} else if val1 < 0 {
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return nil, errors.Errorf("character number must be positive")
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}
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r := rune(val1)
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if !utf8.ValidRune(r) {
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return nil, errors.Errorf("requested character too large for encoding")
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}
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return string(r), nil
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},
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}
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