Method Format

format.go:274–334

(calldepth int, r *Record, output io.Writer)

}

func (f *stringFormatter) Format(calldepth int, r *Record, output io.Writer) error {
	for _, part := range f.parts {
		if part.verb == fmtVerbStatic {
			output.Write([]byte(part.layout))
		} else if part.verb == fmtVerbTime {
			output.Write([]byte(r.Time.Format(part.layout)))
		} else if part.verb == fmtVerbLevelColor {
			doFmtVerbLevelColor(part.layout, r.Level, output)
		} else if part.verb == fmtVerbCallpath {
			depth, err := strconv.Atoi(part.layout)
			if err != nil {
				depth = 0
			}
			output.Write([]byte(formatCallpath(calldepth+1, depth)))
		} else {
			var v interface{}
			switch part.verb {
			case fmtVerbLevel:
				v = r.Level
				break
			case fmtVerbID:
				v = r.ID
				break
			case fmtVerbPid:
				v = pid
				break
			case fmtVerbProgram:
				v = program
				break
			case fmtVerbModule:
				v = r.Module
				break
			case fmtVerbMessage:
				v = r.Message()
				break
			case fmtVerbLongfile, fmtVerbShortfile:
				_, file, line, ok := runtime.Caller(calldepth + 1)
				if !ok {
					file = "???"
					line = 0
				} else if part.verb == fmtVerbShortfile {
					file = filepath.Base(file)
				}
				v = fmt.Sprintf("%s:%d", file, line)
			case fmtVerbLongfunc, fmtVerbShortfunc,
				fmtVerbLongpkg, fmtVerbShortpkg:
				// TODO cache pc
				v = "???"
				if pc, _, _, ok := runtime.Caller(calldepth + 1); ok {
					if f := runtime.FuncForPC(pc); f != nil {
						v = formatFuncName(part.verb, f.Name())
					}
				}
			default:
				panic("unhandled format part")
			}
			fmt.Fprintf(output, part.layout, v)
		}