chore: import upstream snapshot with attribution

server/cast/text.go

@@ -0,0 +1,74 @@
+// 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 cast
+
+import (
+	"github.com/dolthub/go-mysql-server/sql"
+
+	"github.com/dolthub/doltgresql/core/casts"
+	"github.com/dolthub/doltgresql/core/id"
+
+	"github.com/dolthub/doltgresql/server/functions/framework"
+	pgtypes "github.com/dolthub/doltgresql/server/types"
+)
+
+// initText handles all casts that are built-in. This comprises only the source types.
+func initText(builtInCasts map[id.Cast]casts.Cast) {
+	textAssignment(builtInCasts)
+	textImplicit(builtInCasts)
+}
+
+// textAssignment registers all assignment casts. This comprises only the source types.
+func textAssignment(builtInCasts map[id.Cast]casts.Cast) {
+	framework.MustAddAssignmentTypeCast(builtInCasts, framework.TypeCast{
+		FromType: pgtypes.Text,
+		ToType:   pgtypes.InternalChar,
+		Function: func(ctx *sql.Context, val any, _, targetType *pgtypes.DoltgresType) (any, error) {
+			return handleStringCast(val.(string), targetType)
+		},
+	})
+}
+
+// textImplicit registers all implicit casts. This comprises only the source types.
+func textImplicit(builtInCasts map[id.Cast]casts.Cast) {
+	framework.MustAddImplicitTypeCast(builtInCasts, framework.TypeCast{
+		FromType: pgtypes.Text,
+		ToType:   pgtypes.BpChar,
+		Function: func(ctx *sql.Context, val any, _, targetType *pgtypes.DoltgresType) (any, error) {
+			return handleStringCast(val.(string), targetType)
+		},
+	})
+	framework.MustAddImplicitTypeCast(builtInCasts, framework.TypeCast{
+		FromType: pgtypes.Text,
+		ToType:   pgtypes.Name,
+		Function: func(ctx *sql.Context, val any, _, targetType *pgtypes.DoltgresType) (any, error) {
+			return handleStringCast(val.(string), targetType)
+		},
+	})
+	framework.MustAddImplicitTypeCast(builtInCasts, framework.TypeCast{
+		FromType: pgtypes.Text,
+		ToType:   pgtypes.Regclass,
+		Function: func(ctx *sql.Context, val any, _, targetType *pgtypes.DoltgresType) (any, error) {
+			return targetType.IoInput(ctx, val.(string))
+		},
+	})
+	framework.MustAddImplicitTypeCast(builtInCasts, framework.TypeCast{
+		FromType: pgtypes.Text,
+		ToType:   pgtypes.VarChar,
+		Function: func(ctx *sql.Context, val any, _, targetType *pgtypes.DoltgresType) (any, error) {
+			return handleStringCast(val.(string), targetType)
+		},
+	})
+}