Init parses the raw function call line from a goroutine stack trace. Go stack traces print a mangled function call, this wrapper unmangle the string before printing and adds other filtering methods. The main caveat is that for calls in package main, the package import URL is left out.
(raw string)
| 50 | // The main caveat is that for calls in package main, the package import URL is |
| 51 | // left out. |
| 52 | func (f *Func) Init(raw string) error { |
| 53 | // Format can be: |
| 54 | // - gopkg.in/yaml%2ev2.(*Struct).Method (handling dots is tricky) |
| 55 | // - main.func·001 (go statements) |
| 56 | // - foo (C code) |
| 57 | // |
| 58 | // The function is optimized to reduce its memory usage. |
| 59 | endPkg := 0 |
| 60 | if lastSlash := strings.LastIndexByte(raw, '/'); lastSlash != -1 { |
| 61 | // Cut the path elements. |
| 62 | r := strings.IndexByte(raw[lastSlash+1:], '.') |
| 63 | if r == -1 { |
| 64 | return errors.New("bad function reference: expected to have at least one dot") |
| 65 | } |
| 66 | endPkg = lastSlash + r + 1 |
| 67 | } else { |
| 68 | // It's fine if there's no dot, it happens in C code in go1.4 and lower. |
| 69 | endPkg = strings.IndexByte(raw, '.') |
| 70 | } |
| 71 | // Only the path part is escaped. |
| 72 | var err error |
| 73 | if f.Complete, err = url.QueryUnescape(raw); err != nil { |
| 74 | return fmt.Errorf("bad function reference: %w", err) |
| 75 | } |
| 76 | // Update the index in the unescaped string. |
| 77 | endPkg += len(f.Complete) - len(raw) |
| 78 | if endPkg != -1 { |
| 79 | f.ImportPath = f.Complete[:endPkg] |
| 80 | } |
| 81 | f.Name = f.Complete[endPkg+1:] |
| 82 | if idx := strings.LastIndexByte(f.Name, ' '); idx > -1 { |
| 83 | cut := f.Name[:idx] |
| 84 | // TODO(go1.20): switch to strings.CutSuffix |
| 85 | const inGoroutineSuffix = " in goroutine" |
| 86 | if strings.HasSuffix(cut, inGoroutineSuffix) { |
| 87 | f.Name = strings.TrimSuffix(cut, inGoroutineSuffix) |
| 88 | } |
| 89 | } |
| 90 | f.DirName = f.ImportPath |
| 91 | if i := strings.LastIndexByte(f.DirName, '/'); i != -1 { |
| 92 | f.DirName = f.DirName[i+1:] |
| 93 | } |
| 94 | if f.ImportPath == "main" { |
| 95 | f.IsPkgMain = true |
| 96 | // Consider main.main to be exported. |
| 97 | if f.Name == "main" { |
| 98 | f.IsExported = true |
| 99 | } |
| 100 | } else { |
| 101 | parts := strings.Split(f.Name, ".") |
| 102 | r, _ := utf8.DecodeRuneInString(parts[len(parts)-1]) |
| 103 | f.IsExported = unicode.ToUpper(r) == r |
| 104 | } |
| 105 | return nil |
| 106 | } |
| 107 | |
| 108 | // String returns Complete. |
| 109 | func (f *Func) String() string { |