wehub-resource-sync
86 lines
2.9 KiB
Go
86 lines
2.9 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 cast
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import (
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"strconv"
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"unicode"
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/doltgresql/core/casts"
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"github.com/dolthub/doltgresql/core/id"
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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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// initInternalChar handles all casts that are built-in. This comprises only the source types.
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func initInternalChar(builtInCasts map[id.Cast]casts.Cast) {
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internalCharAssignment(builtInCasts)
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internalCharExplicit(builtInCasts)
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internalCharImplicit(builtInCasts)
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}
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// internalCharAssignment registers all assignment casts. This comprises only the source types.
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func internalCharAssignment(builtInCasts map[id.Cast]casts.Cast) {
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framework.MustAddAssignmentTypeCast(builtInCasts, framework.TypeCast{
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FromType: pgtypes.InternalChar,
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ToType: pgtypes.BpChar,
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Function: func(ctx *sql.Context, val any, _, targetType *pgtypes.DoltgresType) (any, error) {
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return targetType.IoInput(ctx, val.(string))
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},
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})
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framework.MustAddAssignmentTypeCast(builtInCasts, framework.TypeCast{
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FromType: pgtypes.InternalChar,
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ToType: pgtypes.VarChar,
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Function: func(ctx *sql.Context, val any, _, targetType *pgtypes.DoltgresType) (any, error) {
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return handleStringCast(val.(string), targetType)
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},
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})
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}
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// internalCharExplicit registers all explicit casts. This comprises only the source types.
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func internalCharExplicit(builtInCasts map[id.Cast]casts.Cast) {
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framework.MustAddExplicitTypeCast(builtInCasts, framework.TypeCast{
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FromType: pgtypes.InternalChar,
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ToType: pgtypes.Int32,
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Function: func(ctx *sql.Context, val any, _, targetType *pgtypes.DoltgresType) (any, error) {
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s := val.(string)
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if len(s) == 0 {
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return int32(0), nil
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}
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if unicode.IsLetter(rune(s[0])) {
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return int32(s[0]), nil
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}
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i, err := strconv.ParseInt(s, 10, 32)
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if err != nil {
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return 0, err
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}
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return int32(i), nil
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},
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})
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}
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// internalCharImplicit registers all implicit casts. This comprises only the source types.
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func internalCharImplicit(builtInCasts map[id.Cast]casts.Cast) {
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framework.MustAddImplicitTypeCast(builtInCasts, framework.TypeCast{
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FromType: pgtypes.InternalChar,
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ToType: pgtypes.Text,
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Function: func(ctx *sql.Context, val any, _, targetType *pgtypes.DoltgresType) (any, error) {
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return val, nil
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},
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})
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}
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