|
| 1 | +package goanalysis |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "fmt" |
| 6 | + "go/token" |
| 7 | + "io" |
| 8 | + "os" |
| 9 | + |
| 10 | + "github.com/pkg/errors" |
| 11 | + "github.com/pmezard/go-difflib/difflib" |
| 12 | + |
| 13 | + "github.com/golangci/golangci-lint/pkg/lint/linter" |
| 14 | + "github.com/golangci/golangci-lint/pkg/result" |
| 15 | +) |
| 16 | + |
| 17 | +func convertSuggestedFixes(lintCtx *linter.Context, linterName string, diag *Diagnostic) ([]result.Issue, error) { |
| 18 | + var issues []result.Issue |
| 19 | + |
| 20 | + for _, fix := range diag.SuggestedFixes { |
| 21 | + origContent := make(map[string][]byte) |
| 22 | + readers := make(map[string]io.ReadSeeker) |
| 23 | + bufs := make(map[string]*bytes.Buffer) |
| 24 | + |
| 25 | + for _, edit := range fix.TextEdits { |
| 26 | + if edit.End == token.NoPos { |
| 27 | + edit.End = edit.Pos |
| 28 | + } |
| 29 | + start, end := diag.Pkg.Fset.Position(edit.Pos), diag.Pkg.Fset.Position(edit.End) |
| 30 | + orig, ok := readers[start.Filename] |
| 31 | + if !ok { |
| 32 | + data, err := os.ReadFile(start.Filename) |
| 33 | + if err != nil { |
| 34 | + return nil, errors.Wrapf(err, "can't read file: %s", start.Filename) |
| 35 | + } |
| 36 | + origContent[start.Filename] = data |
| 37 | + orig = bytes.NewReader(data) |
| 38 | + readers[start.Filename] = orig |
| 39 | + bufs[start.Filename] = &bytes.Buffer{} |
| 40 | + } |
| 41 | + |
| 42 | + buf := bufs[start.Filename] |
| 43 | + cur, err := orig.Seek(0, io.SeekCurrent) |
| 44 | + if err != nil { |
| 45 | + return nil, errors.Wrapf(err, "can't get current position of reader of file %q", start.Filename) |
| 46 | + } |
| 47 | + if l := start.Offset - int(cur); l > 0 { |
| 48 | + b := make([]byte, l) |
| 49 | + if _, err := orig.Read(b); err != nil { |
| 50 | + return nil, errors.Wrapf(err, "can't read form stored reader of file %q", start.Filename) |
| 51 | + } |
| 52 | + buf.Write(b) |
| 53 | + } |
| 54 | + buf.Write(edit.NewText) |
| 55 | + if _, err := orig.Seek(int64(end.Offset), io.SeekStart); err != nil { |
| 56 | + return nil, errors.Wrapf(err, "can't change position of reader of file %q", start.Filename) |
| 57 | + } |
| 58 | + } |
| 59 | + for filename, f := range readers { |
| 60 | + data, err := io.ReadAll(f) |
| 61 | + if err != nil { |
| 62 | + return nil, err |
| 63 | + } |
| 64 | + bufs[filename].Write(data) |
| 65 | + } |
| 66 | + |
| 67 | + for filename, data := range origContent { |
| 68 | + newIssues, err := createPatchAndExtractIssues(lintCtx, linterName, filename, data, bufs[filename].Bytes()) |
| 69 | + if err != nil { |
| 70 | + return nil, err |
| 71 | + } |
| 72 | + for i := range newIssues { |
| 73 | + newIssues[i].Text = fmt.Sprintf("%s: %s", diag.Message, fix.Message) |
| 74 | + } |
| 75 | + issues = append(issues, newIssues...) |
| 76 | + } |
| 77 | + } |
| 78 | + |
| 79 | + return issues, nil |
| 80 | +} |
| 81 | + |
| 82 | +func createPatchAndExtractIssues(lintCtx *linter.Context, linterName, filename string, src, dst []byte) ([]result.Issue, error) { |
| 83 | + out := bytes.Buffer{} |
| 84 | + if _, err := out.WriteString(fmt.Sprintf("--- %[1]s\n+++ %[1]s\n", filename)); err != nil { |
| 85 | + return nil, errors.Wrap(err, "can't write diff header") |
| 86 | + } |
| 87 | + |
| 88 | + d := difflib.UnifiedDiff{ |
| 89 | + A: difflib.SplitLines(string(src)), |
| 90 | + B: difflib.SplitLines(string(dst)), |
| 91 | + Context: 3, |
| 92 | + } |
| 93 | + |
| 94 | + if err := difflib.WriteUnifiedDiff(&out, d); err != nil { |
| 95 | + return nil, errors.Wrap(err, "can't create diff") |
| 96 | + } |
| 97 | + |
| 98 | + newIssues, err := ExtractIssuesFromPatch(out.String(), lintCtx.Log, lintCtx, linterName) |
| 99 | + if err != nil { |
| 100 | + return nil, errors.Wrap(err, "can't extract issues from diff") |
| 101 | + } |
| 102 | + |
| 103 | + return newIssues, nil |
| 104 | +} |
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