mirror of
https://github.com/go-gitea/gitea
synced 2024-12-28 19:44:27 +00:00
1fbdf96c34
Backport #17406. Closes #17378 Both errors from #17378 were caused by #15175. Problem 1 (error with added file): `ToUTF8WithFallbackReader` creates a `MultiReader` from a `byte[2048]` and the remaining reader. `CreateReaderAndGuessDelimiter` tries to read 10000 bytes from this reader but only gets 2048 because that's the first reader in the `MultiReader`. Then the `if size < 1e4` thinks the input is at EOF and just returns that. Problem 2 (error with changed file): The blob reader gets defer closed. That was fine because the old version reads the whole file into memory. Now with the streaming version the close needs to defer after the method. Co-authored-by: zeripath <art27@cantab.net>
102 lines
2.6 KiB
Go
102 lines
2.6 KiB
Go
// Copyright 2021 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package csv
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import (
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"bytes"
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"encoding/csv"
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stdcsv "encoding/csv"
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"errors"
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"io"
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"regexp"
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"strings"
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"code.gitea.io/gitea/modules/translation"
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"code.gitea.io/gitea/modules/util"
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)
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var quoteRegexp = regexp.MustCompile(`["'][\s\S]+?["']`)
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// CreateReader creates a csv.Reader with the given delimiter.
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func CreateReader(input io.Reader, delimiter rune) *stdcsv.Reader {
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rd := stdcsv.NewReader(input)
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rd.Comma = delimiter
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rd.TrimLeadingSpace = true
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return rd
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}
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// CreateReaderAndGuessDelimiter tries to guess the field delimiter from the content and creates a csv.Reader.
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// Reads at most 10k bytes.
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func CreateReaderAndGuessDelimiter(rd io.Reader) (*stdcsv.Reader, error) {
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var data = make([]byte, 1e4)
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size, err := util.ReadAtMost(rd, data)
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if err != nil {
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return nil, err
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}
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return CreateReader(
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io.MultiReader(bytes.NewReader(data[:size]), rd),
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guessDelimiter(data[:size]),
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), nil
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}
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// guessDelimiter scores the input CSV data against delimiters, and returns the best match.
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func guessDelimiter(data []byte) rune {
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maxLines := 10
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text := quoteRegexp.ReplaceAllLiteralString(string(data), "")
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lines := strings.SplitN(text, "\n", maxLines+1)
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lines = lines[:util.Min(maxLines, len(lines))]
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delimiters := []rune{',', ';', '\t', '|', '@'}
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bestDelim := delimiters[0]
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bestScore := 0.0
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for _, delim := range delimiters {
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score := scoreDelimiter(lines, delim)
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if score > bestScore {
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bestScore = score
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bestDelim = delim
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}
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}
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return bestDelim
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}
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// scoreDelimiter uses a count & regularity metric to evaluate a delimiter against lines of CSV.
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func scoreDelimiter(lines []string, delim rune) float64 {
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countTotal := 0
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countLineMax := 0
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linesNotEqual := 0
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for _, line := range lines {
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if len(line) == 0 {
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continue
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}
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countLine := strings.Count(line, string(delim))
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countTotal += countLine
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if countLine != countLineMax {
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if countLineMax != 0 {
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linesNotEqual++
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}
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countLineMax = util.Max(countLine, countLineMax)
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}
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}
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return float64(countTotal) * (1 - float64(linesNotEqual)/float64(len(lines)))
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}
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// FormatError converts csv errors into readable messages.
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func FormatError(err error, locale translation.Locale) (string, error) {
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var perr *csv.ParseError
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if errors.As(err, &perr) {
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if perr.Err == csv.ErrFieldCount {
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return locale.Tr("repo.error.csv.invalid_field_count", perr.Line), nil
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}
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return locale.Tr("repo.error.csv.unexpected", perr.Line, perr.Column), nil
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}
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return "", err
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}
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