Fix diff skipping lines (#13154)
* Fix diff skipping lines ParsePatch previously just skipped all lines that start with "+++ " or "--- " and makes no attempt to see these lines in context. This PR rewrites ParsePatch to pay attention to context and position within a patch, ensuring that --- and +++ are only skipped if appropriate. This PR also fixes several issues with incomplete files. Fix https://codeberg.org/Codeberg/Community/issues/308 Fix #13153 Signed-off-by: Andrew Thornton <art27@cantab.net> * Add testcase Signed-off-by: Andrew Thornton <art27@cantab.net> * fix comment * simplify error handling Signed-off-by: Andrew Thornton <art27@cantab.net> * never return io.EOF Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv>
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6bab678bed
2 changed files with 358 additions and 192 deletions
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@ -441,91 +441,252 @@ func (diff *Diff) LoadComments(issue *models.Issue, currentUser *models.User) er
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const cmdDiffHead = "diff --git "
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// ParsePatch builds a Diff object from a io.Reader and some
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// parameters.
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// TODO: move this function to gogits/git-module
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// ParsePatch builds a Diff object from a io.Reader and some parameters.
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func ParsePatch(maxLines, maxLineCharacters, maxFiles int, reader io.Reader) (*Diff, error) {
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var (
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diff = &Diff{Files: make([]*DiffFile, 0)}
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curFile = &DiffFile{}
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curSection = &DiffSection{
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Lines: make([]*DiffLine, 0, 10),
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var curFile *DiffFile
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diff := &Diff{Files: make([]*DiffFile, 0)}
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sb := strings.Builder{}
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// OK let's set a reasonable buffer size.
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// This should be let's say at least the size of maxLineCharacters or 4096 whichever is larger.
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readerSize := maxLineCharacters
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if readerSize < 4096 {
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readerSize = 4096
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}
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input := bufio.NewReaderSize(reader, readerSize)
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line, err := input.ReadString('\n')
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if err != nil {
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if err == io.EOF {
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return diff, nil
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}
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return diff, err
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}
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parsingLoop:
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for {
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// 1. A patch file always begins with `diff --git ` + `a/path b/path` (possibly quoted)
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// if it does not we have bad input!
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if !strings.HasPrefix(line, cmdDiffHead) {
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return diff, fmt.Errorf("Invalid first file line: %s", line)
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}
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leftLine, rightLine int
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lineCount int
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curFileLinesCount int
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curFileLFSPrefix bool
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// TODO: Handle skipping first n files
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if len(diff.Files) >= maxFiles {
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diff.IsIncomplete = true
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_, err := io.Copy(ioutil.Discard, reader)
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if err != nil {
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// By the definition of io.Copy this never returns io.EOF
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return diff, fmt.Errorf("Copy: %v", err)
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}
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break parsingLoop
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}
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curFile = createDiffFile(diff, line)
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diff.Files = append(diff.Files, curFile)
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// 2. It is followed by one or more extended header lines:
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//
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// old mode <mode>
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// new mode <mode>
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// deleted file mode <mode>
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// new file mode <mode>
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// copy from <path>
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// copy to <path>
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// rename from <path>
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// rename to <path>
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// similarity index <number>
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// dissimilarity index <number>
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// index <hash>..<hash> <mode>
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//
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// * <mode> 6-digit octal numbers including the file type and file permission bits.
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// * <path> does not include the a/ and b/ prefixes
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// * <number> percentage of unchanged lines for similarity, percentage of changed
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// lines dissimilarity as integer rounded down with terminal %. 100% => equal files.
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// * The index line includes the blob object names before and after the change.
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// The <mode> is included if the file mode does not change; otherwise, separate
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// lines indicate the old and the new mode.
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// 3. Following this header the "standard unified" diff format header may be encountered: (but not for every case...)
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//
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// --- a/<path>
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// +++ b/<path>
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//
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// With multiple hunks
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//
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// @@ <hunk descriptor> @@
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// +added line
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// -removed line
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// unchanged line
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//
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// 4. Binary files get:
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//
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// Binary files a/<path> and b/<path> differ
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//
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// but one of a/<path> and b/<path> could be /dev/null.
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curFileLoop:
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for {
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line, err = input.ReadString('\n')
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if err != nil {
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if err != io.EOF {
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return diff, err
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}
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break parsingLoop
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}
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switch {
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case strings.HasPrefix(line, "old mode ") ||
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strings.HasPrefix(line, "new mode "):
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if strings.HasSuffix(line, " 160000\n") {
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curFile.IsSubmodule = true
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}
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case strings.HasPrefix(line, "copy from "):
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curFile.IsRenamed = true
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curFile.Type = DiffFileCopy
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case strings.HasPrefix(line, "copy to "):
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curFile.IsRenamed = true
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curFile.Type = DiffFileCopy
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case strings.HasPrefix(line, "new file"):
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curFile.Type = DiffFileAdd
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curFile.IsCreated = true
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if strings.HasSuffix(line, " 160000\n") {
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curFile.IsSubmodule = true
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}
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case strings.HasPrefix(line, "deleted"):
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curFile.Type = DiffFileDel
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curFile.IsDeleted = true
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if strings.HasSuffix(line, " 160000\n") {
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curFile.IsSubmodule = true
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}
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case strings.HasPrefix(line, "index"):
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if strings.HasSuffix(line, " 160000\n") {
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curFile.IsSubmodule = true
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}
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case strings.HasPrefix(line, "similarity index 100%"):
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curFile.Type = DiffFileRename
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case strings.HasPrefix(line, "Binary"):
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curFile.IsBin = true
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case strings.HasPrefix(line, "--- "):
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// Do nothing with this line
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case strings.HasPrefix(line, "+++ "):
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// Do nothing with this line
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lineBytes, isFragment, err := parseHunks(curFile, maxLines, maxLineCharacters, input)
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diff.TotalAddition += curFile.Addition
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diff.TotalDeletion += curFile.Deletion
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if err != nil {
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if err != io.EOF {
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return diff, err
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}
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break parsingLoop
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}
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sb.Reset()
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_, _ = sb.Write(lineBytes)
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for isFragment {
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lineBytes, isFragment, err = input.ReadLine()
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if err != nil {
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// Now by the definition of ReadLine this cannot be io.EOF
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return diff, fmt.Errorf("Unable to ReadLine: %v", err)
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}
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_, _ = sb.Write(lineBytes)
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}
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line = sb.String()
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sb.Reset()
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break curFileLoop
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}
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}
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}
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// FIXME: There are numerous issues with this:
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// - we might want to consider detecting encoding while parsing but...
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// - we're likely to fail to get the correct encoding here anyway as we won't have enough information
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// - and this doesn't really account for changes in encoding
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var buf bytes.Buffer
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for _, f := range diff.Files {
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buf.Reset()
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for _, sec := range f.Sections {
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for _, l := range sec.Lines {
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if l.Type == DiffLineSection {
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continue
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}
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buf.WriteString(l.Content[1:])
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buf.WriteString("\n")
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}
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}
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charsetLabel, err := charset.DetectEncoding(buf.Bytes())
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if charsetLabel != "UTF-8" && err == nil {
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encoding, _ := stdcharset.Lookup(charsetLabel)
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if encoding != nil {
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d := encoding.NewDecoder()
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for _, sec := range f.Sections {
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for _, l := range sec.Lines {
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if l.Type == DiffLineSection {
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continue
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}
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if c, _, err := transform.String(d, l.Content[1:]); err == nil {
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l.Content = l.Content[0:1] + c
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}
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}
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}
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}
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}
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}
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diff.NumFiles = len(diff.Files)
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return diff, nil
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}
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func parseHunks(curFile *DiffFile, maxLines, maxLineCharacters int, input *bufio.Reader) (lineBytes []byte, isFragment bool, err error) {
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sb := strings.Builder{}
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var (
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curSection *DiffSection
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curFileLinesCount int
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curFileLFSPrefix bool
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)
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input := bufio.NewReader(reader)
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isEOF := false
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for !isEOF {
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var linebuf bytes.Buffer
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for {
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b, err := input.ReadByte()
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if err != nil {
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if err == io.EOF {
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isEOF = true
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break
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} else {
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return nil, fmt.Errorf("ReadByte: %v", err)
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}
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leftLine, rightLine := 1, 1
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for {
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sb.Reset()
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lineBytes, isFragment, err = input.ReadLine()
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if err != nil {
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if err == io.EOF {
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return
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}
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if b == '\n' {
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break
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}
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if linebuf.Len() < maxLineCharacters {
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linebuf.WriteByte(b)
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} else if linebuf.Len() == maxLineCharacters {
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err = fmt.Errorf("Unable to ReadLine: %v", err)
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return
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}
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if lineBytes[0] == 'd' {
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// End of hunks
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return
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}
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switch lineBytes[0] {
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case '@':
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if curFileLinesCount >= maxLines {
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curFile.IsIncomplete = true
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continue
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}
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}
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line := linebuf.String()
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if strings.HasPrefix(line, "+++ ") || strings.HasPrefix(line, "--- ") || len(line) == 0 {
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continue
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}
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trimLine := strings.Trim(line, "+- ")
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if trimLine == models.LFSMetaFileIdentifier {
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curFileLFSPrefix = true
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}
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if curFileLFSPrefix && strings.HasPrefix(trimLine, models.LFSMetaFileOidPrefix) {
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oid := strings.TrimPrefix(trimLine, models.LFSMetaFileOidPrefix)
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if len(oid) == 64 {
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m := &models.LFSMetaObject{Oid: oid}
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count, err := models.Count(m)
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if err == nil && count > 0 {
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curFile.IsBin = true
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curFile.IsLFSFile = true
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curSection.Lines = nil
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_, _ = sb.Write(lineBytes)
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for isFragment {
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// This is very odd indeed - we're in a section header and the line is too long
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// This really shouldn't happen...
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lineBytes, isFragment, err = input.ReadLine()
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if err != nil {
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// Now by the definition of ReadLine this cannot be io.EOF
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err = fmt.Errorf("Unable to ReadLine: %v", err)
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return
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}
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_, _ = sb.Write(lineBytes)
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}
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}
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line := sb.String()
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curFileLinesCount++
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lineCount++
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// Diff data too large, we only show the first about maxLines lines
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if curFileLinesCount >= maxLines {
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curFile.IsIncomplete = true
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}
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switch {
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case line[0] == ' ':
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diffLine := &DiffLine{Type: DiffLinePlain, Content: line, LeftIdx: leftLine, RightIdx: rightLine}
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leftLine++
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rightLine++
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curSection.Lines = append(curSection.Lines, diffLine)
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curSection.FileName = curFile.Name
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continue
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case line[0] == '@':
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// Create a new section to represent this hunk
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curSection = &DiffSection{}
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curFile.Sections = append(curFile.Sections, curSection)
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lineSectionInfo := getDiffLineSectionInfo(curFile.Name, line, leftLine-1, rightLine-1)
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diffLine := &DiffLine{
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Type: DiffLineSection,
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@ -538,148 +699,132 @@ func ParsePatch(maxLines, maxLineCharacters, maxFiles int, reader io.Reader) (*D
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leftLine = lineSectionInfo.LeftIdx
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rightLine = lineSectionInfo.RightIdx
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continue
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case line[0] == '+':
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case '\\':
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if curFileLinesCount >= maxLines {
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curFile.IsIncomplete = true
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continue
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}
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// This is used only to indicate that the current file does not have a terminal newline
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if !bytes.Equal(lineBytes, []byte("\\ No newline at end of file")) {
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err = fmt.Errorf("Unexpected line in hunk: %s", string(lineBytes))
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return
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}
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// Technically this should be the end the file!
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// FIXME: we should be putting a marker at the end of the file if there is no terminal new line
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continue
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case '+':
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curFileLinesCount++
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curFile.Addition++
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diff.TotalAddition++
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diffLine := &DiffLine{Type: DiffLineAdd, Content: line, RightIdx: rightLine}
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if curFileLinesCount >= maxLines {
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curFile.IsIncomplete = true
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continue
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}
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diffLine := &DiffLine{Type: DiffLineAdd, RightIdx: rightLine}
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rightLine++
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curSection.Lines = append(curSection.Lines, diffLine)
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curSection.FileName = curFile.Name
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continue
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case line[0] == '-':
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case '-':
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curFileLinesCount++
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curFile.Deletion++
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diff.TotalDeletion++
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diffLine := &DiffLine{Type: DiffLineDel, Content: line, LeftIdx: leftLine}
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if curFileLinesCount >= maxLines {
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curFile.IsIncomplete = true
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continue
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}
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diffLine := &DiffLine{Type: DiffLineDel, LeftIdx: leftLine}
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if leftLine > 0 {
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leftLine++
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}
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curSection.Lines = append(curSection.Lines, diffLine)
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curSection.FileName = curFile.Name
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case strings.HasPrefix(line, "Binary"):
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curFile.IsBin = true
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continue
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case ' ':
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curFileLinesCount++
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if curFileLinesCount >= maxLines {
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curFile.IsIncomplete = true
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continue
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}
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diffLine := &DiffLine{Type: DiffLinePlain, LeftIdx: leftLine, RightIdx: rightLine}
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leftLine++
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rightLine++
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curSection.Lines = append(curSection.Lines, diffLine)
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default:
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// This is unexpected
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err = fmt.Errorf("Unexpected line in hunk: %s", string(lineBytes))
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return
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}
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// Get new file.
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if strings.HasPrefix(line, cmdDiffHead) {
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if len(diff.Files) >= maxFiles {
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diff.IsIncomplete = true
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_, err := io.Copy(ioutil.Discard, reader)
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line := string(lineBytes)
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if isFragment {
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curFile.IsIncomplete = true
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for isFragment {
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lineBytes, isFragment, err = input.ReadLine()
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if err != nil {
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return nil, fmt.Errorf("Copy: %v", err)
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// Now by the definition of ReadLine this cannot be io.EOF
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err = fmt.Errorf("Unable to ReadLine: %v", err)
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return
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}
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break
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}
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}
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curSection.Lines[len(curSection.Lines)-1].Content = line
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// Note: In case file name is surrounded by double quotes (it happens only in git-shell).
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// e.g. diff --git "a/xxx" "b/xxx"
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var a string
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var b string
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// handle LFS
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if line[1:] == models.LFSMetaFileIdentifier {
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curFileLFSPrefix = true
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} else if curFileLFSPrefix && strings.HasPrefix(line[1:], models.LFSMetaFileOidPrefix) {
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oid := strings.TrimPrefix(line[1:], models.LFSMetaFileOidPrefix)
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if len(oid) == 64 {
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m := &models.LFSMetaObject{Oid: oid}
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count, err := models.Count(m)
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rd := strings.NewReader(line[len(cmdDiffHead):])
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char, _ := rd.ReadByte()
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_ = rd.UnreadByte()
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if char == '"' {
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fmt.Fscanf(rd, "%q ", &a)
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if a[0] == '\\' {
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a = a[1:]
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}
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} else {
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fmt.Fscanf(rd, "%s ", &a)
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}
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char, _ = rd.ReadByte()
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_ = rd.UnreadByte()
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if char == '"' {
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fmt.Fscanf(rd, "%q", &b)
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if b[0] == '\\' {
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b = b[1:]
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}
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} else {
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fmt.Fscanf(rd, "%s", &b)
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}
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a = a[2:]
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b = b[2:]
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curFile = &DiffFile{
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Name: b,
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OldName: a,
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Index: len(diff.Files) + 1,
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Type: DiffFileChange,
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Sections: make([]*DiffSection, 0, 10),
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IsRenamed: a != b,
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}
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diff.Files = append(diff.Files, curFile)
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curFileLinesCount = 0
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leftLine = 1
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rightLine = 1
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curFileLFSPrefix = false
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// Check file diff type and is submodule.
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for {
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line, err := input.ReadString('\n')
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if err != nil {
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if err == io.EOF {
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isEOF = true
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} else {
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return nil, fmt.Errorf("ReadString: %v", err)
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}
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}
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switch {
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case strings.HasPrefix(line, "copy from "):
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curFile.IsRenamed = true
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curFile.Type = DiffFileCopy
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case strings.HasPrefix(line, "copy to "):
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curFile.IsRenamed = true
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curFile.Type = DiffFileCopy
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case strings.HasPrefix(line, "new file"):
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||||
curFile.Type = DiffFileAdd
|
||||
curFile.IsCreated = true
|
||||
case strings.HasPrefix(line, "deleted"):
|
||||
curFile.Type = DiffFileDel
|
||||
curFile.IsDeleted = true
|
||||
case strings.HasPrefix(line, "index"):
|
||||
curFile.Type = DiffFileChange
|
||||
case strings.HasPrefix(line, "similarity index 100%"):
|
||||
curFile.Type = DiffFileRename
|
||||
}
|
||||
if curFile.Type > 0 {
|
||||
if strings.HasSuffix(line, " 160000\n") {
|
||||
curFile.IsSubmodule = true
|
||||
}
|
||||
break
|
||||
if err == nil && count > 0 {
|
||||
curFile.IsBin = true
|
||||
curFile.IsLFSFile = true
|
||||
curSection.Lines = nil
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// FIXME: detect encoding while parsing.
|
||||
var buf bytes.Buffer
|
||||
for _, f := range diff.Files {
|
||||
buf.Reset()
|
||||
for _, sec := range f.Sections {
|
||||
for _, l := range sec.Lines {
|
||||
buf.WriteString(l.Content)
|
||||
buf.WriteString("\n")
|
||||
}
|
||||
}
|
||||
charsetLabel, err := charset.DetectEncoding(buf.Bytes())
|
||||
if charsetLabel != "UTF-8" && err == nil {
|
||||
encoding, _ := stdcharset.Lookup(charsetLabel)
|
||||
if encoding != nil {
|
||||
d := encoding.NewDecoder()
|
||||
for _, sec := range f.Sections {
|
||||
for _, l := range sec.Lines {
|
||||
if c, _, err := transform.String(d, l.Content); err == nil {
|
||||
l.Content = c
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
func createDiffFile(diff *Diff, line string) *DiffFile {
|
||||
// The a/ and b/ filenames are the same unless rename/copy is involved.
|
||||
// Especially, even for a creation or a deletion, /dev/null is not used
|
||||
// in place of the a/ or b/ filenames.
|
||||
//
|
||||
// When rename/copy is involved, file1 and file2 show the name of the
|
||||
// source file of the rename/copy and the name of the file that rename/copy
|
||||
// produces, respectively.
|
||||
//
|
||||
// Path names are quoted if necessary.
|
||||
//
|
||||
// This means that you should always be able to determine the file name even when there
|
||||
// there is potential ambiguity...
|
||||
//
|
||||
// but we can be simpler with our heuristics by just forcing git to prefix things nicely
|
||||
curFile := &DiffFile{
|
||||
Index: len(diff.Files) + 1,
|
||||
Type: DiffFileChange,
|
||||
Sections: make([]*DiffSection, 0, 10),
|
||||
}
|
||||
diff.NumFiles = len(diff.Files)
|
||||
return diff, nil
|
||||
|
||||
rd := strings.NewReader(line[len(cmdDiffHead):] + " ")
|
||||
curFile.Type = DiffFileChange
|
||||
curFile.OldName = readFileName(rd)
|
||||
curFile.Name = readFileName(rd)
|
||||
curFile.IsRenamed = curFile.Name != curFile.OldName
|
||||
return curFile
|
||||
}
|
||||
|
||||
func readFileName(rd *strings.Reader) string {
|
||||
var name string
|
||||
char, _ := rd.ReadByte()
|
||||
_ = rd.UnreadByte()
|
||||
if char == '"' {
|
||||
fmt.Fscanf(rd, "%q ", &name)
|
||||
if name[0] == '\\' {
|
||||
name = name[1:]
|
||||
}
|
||||
} else {
|
||||
fmt.Fscanf(rd, "%s ", &name)
|
||||
}
|
||||
return name[2:]
|
||||
}
|
||||
|
||||
// GetDiffRange builds a Diff between two commits of a repository.
|
||||
|
|
|
|||
|
|
@ -182,6 +182,27 @@ rename to a b/a a/file b/b file
|
|||
oldFilename: "a b/file b/a a/file",
|
||||
filename: "a b/a a/file b/b file",
|
||||
},
|
||||
{
|
||||
name: "minuses-and-pluses",
|
||||
gitdiff: `diff --git a/minuses-and-pluses b/minuses-and-pluses
|
||||
index 6961180..9ba1a00 100644
|
||||
--- a/minuses-and-pluses
|
||||
+++ b/minuses-and-pluses
|
||||
@@ -1,4 +1,4 @@
|
||||
--- 1st line
|
||||
-++ 2nd line
|
||||
--- 3rd line
|
||||
-++ 4th line
|
||||
+++ 1st line
|
||||
+-- 2nd line
|
||||
+++ 3rd line
|
||||
+-- 4th line
|
||||
`,
|
||||
oldFilename: "minuses-and-pluses",
|
||||
filename: "minuses-and-pluses",
|
||||
addition: 4,
|
||||
deletion: 4,
|
||||
},
|
||||
}
|
||||
|
||||
for _, testcase := range tests {
|
||||
|
|
|
|||
Reference in a new issue