| 1 | package fmt |
|---|---|
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "strings" |
| 6 | ) |
| 7 | |
| 8 | func Sprint(args ...interface{}) string |
| 9 | |
| 10 | func Sprintln(args ...interface{}) string { |
| 11 | return Sprint(args...) + "\n" |
| 12 | } |
| 13 | |
| 14 | func Print(args ...interface{}) (int, error) { |
| 15 | var n int |
| 16 | for i, arg := range args { |
| 17 | if i > 0 { |
| 18 | print(" ") |
| 19 | n++ |
| 20 | } |
| 21 | msg := Sprint(arg) |
| 22 | n += len(msg) |
| 23 | print(msg) |
| 24 | } |
| 25 | return n, nil |
| 26 | } |
| 27 | |
| 28 | func Println(args ...interface{}) { |
| 29 | Print(args...) |
| 30 | println() |
| 31 | } |
| 32 | |
| 33 | // formatting is too complex to fake |
| 34 | // handle the bare minimum needed for tests |
| 35 | |
| 36 | func Printf(format string, args ...interface{}) (int, error) { |
| 37 | msg := Sprintf(format, args...) |
| 38 | print(msg) |
| 39 | return len(msg), nil |
| 40 | } |
| 41 | |
| 42 | func Sprintf(format string, args ...interface{}) string { |
| 43 | // handle extremely simple cases that appear in tests. |
| 44 | if len(format) == 0 { |
| 45 | return "" |
| 46 | } |
| 47 | switch { |
| 48 | case strings.HasPrefix("%v", format) || strings.HasPrefix("%s", format): |
| 49 | return Sprint(args[0]) + Sprintf(format[2:], args[1:]...) |
| 50 | case !strings.HasPrefix("%", format): |
| 51 | return format[:1] + Sprintf(format[1:], args...) |
| 52 | default: |
| 53 | panic("unsupported format string for testing Sprintf") |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | func Errorf(format string, args ...interface{}) error { |
| 58 | msg := Sprintf(format, args...) |
| 59 | return errors.New(msg) |
| 60 | } |
| 61 |
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