wehub-resource-sync
97 lines
3.6 KiB
Go
97 lines
3.6 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 types
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import (
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"github.com/dolthub/go-mysql-server/sql"
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"gopkg.in/src-d/go-errors.v1"
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"github.com/dolthub/doltgresql/utils"
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"github.com/dolthub/doltgresql/core/id"
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)
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// ErrVarBitLengthExceeded is returned when a varbit value exceeds the defined length.
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var ErrVarBitLengthExceeded = errors.NewKind(`bit string too long for type bit varying(%d)`)
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// VarBit is a varying-length bit string.
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var VarBit = &DoltgresType{
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ID: toInternal("varbit"),
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TypLength: int16(-1),
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PassedByVal: false,
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TypType: TypeType_Base,
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TypCategory: TypeCategory_BitStringTypes,
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IsPreferred: false,
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IsDefined: true,
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Delimiter: ",",
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RelID: id.Null,
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SubscriptFunc: toFuncID("-"),
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Elem: internalNullType,
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Array: internalNullType,
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InputFunc: toFuncID("varbit_in", toInternal("cstring"), toInternal("oid"), toInternal("int4")),
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OutputFunc: toFuncID("varbit_out", toInternal("varbit")),
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ReceiveFunc: toFuncID("varbit_recv", toInternal("internal"), toInternal("oid"), toInternal("int4")),
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SendFunc: toFuncID("varbit_send", toInternal("varbit")),
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ModInFunc: toFuncID("varbittypmodin", toInternal("_cstring")),
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ModOutFunc: toFuncID("varbittypmodout", toInternal("int4")),
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AnalyzeFunc: toFuncID("-"),
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Align: TypeAlignment_Int,
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Storage: TypeStorage_Extended,
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NotNull: false,
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BaseTypeType: internalNullType,
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TypMod: -1,
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NDims: 0,
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TypCollation: id.NewCollation("pg_catalog", "default"),
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DefaulBin: "",
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Default: "",
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Acl: nil,
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Checks: nil,
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attTypMod: -1,
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CompareFunc: toFuncID("varbitcmp", toInternal("varbit"), toInternal("varbit")),
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SerializationFunc: serializeTypeVarbit,
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DeserializationFunc: deserializeTypeVarbit,
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}
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// NewVarBitType returns a VarBit type with type modifier set
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// representing the max number of bits in the string.
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func NewVarBitType(width int32) (*DoltgresType, error) {
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if width < 1 {
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return nil, ErrLengthMustBeAtLeast1.New("varbit")
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} else if width > StringMaxLength {
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return nil, ErrLengthCannotExceed.New("varbit")
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}
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newType := *VarBit.WithAttTypMod(width)
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return &newType, nil
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}
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// serializeTypeVarbit handles serialization from the standard representation to our serialized representation that is
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// written in Dolt.
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func serializeTypeVarbit(ctx *sql.Context, t *DoltgresType, val any) ([]byte, error) {
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bitStr := val.(string)
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writer := utils.NewWriter(uint64(len(bitStr) + 4))
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writer.String(bitStr)
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return writer.Data(), nil
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}
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// deserializeTypeVarbit handles deserialization from the Dolt serialized format to our standard representation used by
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// expressions and nodes.
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func deserializeTypeVarbit(ctx *sql.Context, t *DoltgresType, data []byte) (any, error) {
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if len(data) == 0 {
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return nil, nil
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}
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reader := utils.NewReader(data)
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return reader.String(), nil
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}
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