wehub-resource-sync
91 lines
3.2 KiB
Go
91 lines
3.2 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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"fmt"
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"strings"
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"unicode/utf8"
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cerrors "github.com/cockroachdb/errors"
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"gopkg.in/src-d/go-errors.v1"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// errOutOfRange is returned when a value is out of range for a given type.
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var errOutOfRange = errors.NewKind("%s out of range")
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// handleStringCast handles casts to the string types that may have length restrictions. Returns an error if other types
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// are passed in. Will always return the correct string, even on error, as some contexts may ignore the error.
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func handleStringCast(input string, targetType *pgtypes.DoltgresType) (string, error) {
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tm := targetType.GetAttTypMod()
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switch targetType.ID {
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case pgtypes.BpChar.ID:
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if tm == -1 {
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return input, nil
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}
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maxChars, err := pgtypes.GetTypModFromCharLength("char", tm)
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if err != nil {
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return "", err
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}
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length := uint32(maxChars)
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str, runeLength := truncateString(input, length)
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if runeLength > length {
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return input, cerrors.Wrap(pgtypes.ErrCastOutOfRange, fmt.Sprintf("value too long for type %s", targetType.String()))
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} else if runeLength < length {
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return str + strings.Repeat(" ", int(length-runeLength)), nil
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} else {
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return str, nil
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}
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case pgtypes.InternalChar.ID:
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str, _ := truncateString(input, pgtypes.InternalCharLength)
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return str, nil
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case pgtypes.Name.ID:
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// Name seems to never throw an error, regardless of the context or how long the input is
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str, _ := truncateString(input, uint32(targetType.TypLength))
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return str, nil
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case pgtypes.VarChar.ID:
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if tm == -1 {
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return input, nil
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}
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length := uint32(pgtypes.GetCharLengthFromTypmod(tm))
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str, runeLength := truncateString(input, length)
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if runeLength > length {
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return input, cerrors.Wrap(pgtypes.ErrCastOutOfRange, fmt.Sprintf("value too long for type %s", targetType.String()))
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} else {
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return str, nil
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}
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default:
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return "", cerrors.Errorf("internal cast called to handle non-string type")
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}
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}
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// truncateString returns a string that has been truncated to the given length. Uses the rune count rather than the
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// byte count. Returns the input string if it's smaller than the length. Also returns the rune count of the string.
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func truncateString(val string, runeLimit uint32) (string, uint32) {
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runeLength := uint32(utf8.RuneCountInString(val))
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if runeLength > runeLimit {
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// TODO: figure out if there's a faster way to truncate based on rune count
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startString := val
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for i := uint32(0); i < runeLimit; i++ {
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_, size := utf8.DecodeRuneInString(val)
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val = val[size:]
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}
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return startString[:len(startString)-len(val)], runeLength
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}
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return val, runeLength
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}
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