| // Copyright 2009 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package fmt_test |
| |
| import ( |
| "bytes" |
| . "fmt" |
| "io" |
| "math" |
| "runtime" // for the malloc count test only |
| "strings" |
| "testing" |
| ) |
| |
| type ( |
| renamedBool bool |
| renamedInt int |
| renamedInt8 int8 |
| renamedInt16 int16 |
| renamedInt32 int32 |
| renamedInt64 int64 |
| renamedUint uint |
| renamedUint8 uint8 |
| renamedUint16 uint16 |
| renamedUint32 uint32 |
| renamedUint64 uint64 |
| renamedUintptr uintptr |
| renamedString string |
| renamedBytes []byte |
| renamedFloat32 float32 |
| renamedFloat64 float64 |
| renamedComplex64 complex64 |
| renamedComplex128 complex128 |
| ) |
| |
| func TestFmtInterface(t *testing.T) { |
| var i1 interface{} |
| i1 = "abc" |
| s := Sprintf("%s", i1) |
| if s != "abc" { |
| t.Errorf(`Sprintf("%%s", empty("abc")) = %q want %q`, s, "abc") |
| } |
| } |
| |
| const b32 uint32 = 1<<32 - 1 |
| const b64 uint64 = 1<<64 - 1 |
| |
| var array = []int{1, 2, 3, 4, 5} |
| var iarray = []interface{}{1, "hello", 2.5, nil} |
| |
| type A struct { |
| i int |
| j uint |
| s string |
| x []int |
| } |
| |
| type I int |
| |
| func (i I) String() string { return Sprintf("<%d>", int(i)) } |
| |
| type B struct { |
| I I |
| j int |
| } |
| |
| type C struct { |
| i int |
| B |
| } |
| |
| type F int |
| |
| func (f F) Format(s State, c int) { |
| Fprintf(s, "<%c=F(%d)>", c, int(f)) |
| } |
| |
| type G int |
| |
| func (g G) GoString() string { |
| return Sprintf("GoString(%d)", int(g)) |
| } |
| |
| type S struct { |
| F F // a struct field that Formats |
| G G // a struct field that GoStrings |
| } |
| |
| type SI struct { |
| I interface{} |
| } |
| |
| // A type with a String method with pointer receiver for testing %p |
| type P int |
| |
| var pValue P |
| |
| func (p *P) String() string { |
| return "String(p)" |
| } |
| |
| var b byte |
| |
| var fmttests = []struct { |
| fmt string |
| val interface{} |
| out string |
| }{ |
| {"%d", 12345, "12345"}, |
| {"%v", 12345, "12345"}, |
| {"%t", true, "true"}, |
| |
| // basic string |
| {"%s", "abc", "abc"}, |
| {"%x", "abc", "616263"}, |
| {"%x", "xyz", "78797a"}, |
| {"%X", "xyz", "78797A"}, |
| {"%q", "abc", `"abc"`}, |
| |
| // basic bytes |
| {"%s", []byte("abc"), "abc"}, |
| {"%x", []byte("abc"), "616263"}, |
| {"% x", []byte("abc\xff"), "61 62 63 ff"}, |
| {"% X", []byte("abc\xff"), "61 62 63 FF"}, |
| {"%x", []byte("xyz"), "78797a"}, |
| {"%X", []byte("xyz"), "78797A"}, |
| {"%q", []byte("abc"), `"abc"`}, |
| |
| // escaped strings |
| {"%#q", `abc`, "`abc`"}, |
| {"%#q", `"`, "`\"`"}, |
| {"1 %#q", `\n`, "1 `\\n`"}, |
| {"2 %#q", "\n", `2 "\n"`}, |
| {"%q", `"`, `"\""`}, |
| {"%q", "\a\b\f\r\n\t\v", `"\a\b\f\r\n\t\v"`}, |
| {"%q", "abc\xffdef", `"abc\xffdef"`}, |
| {"%q", "\u263a", `"☺"`}, |
| {"%+q", "\u263a", `"\u263a"`}, |
| {"%q", "\U0010ffff", `"\U0010ffff"`}, |
| |
| // escaped characters |
| {"%q", 'x', `'x'`}, |
| {"%q", 0, `'\x00'`}, |
| {"%q", '\n', `'\n'`}, |
| {"%q", '\u0e00', `'\u0e00'`}, // not a printable rune. |
| {"%q", '\U000c2345', `'\U000c2345'`}, // not a printable rune. |
| {"%q", int64(0x7FFFFFFF), `%!q(int64=2147483647)`}, |
| {"%q", uint64(0xFFFFFFFF), `%!q(uint64=4294967295)`}, |
| {"%q", '"', `'"'`}, |
| {"%q", '\'', `'\''`}, |
| {"%q", "\u263a", `"☺"`}, |
| {"%+q", "\u263a", `"\u263a"`}, |
| |
| // width |
| {"%5s", "abc", " abc"}, |
| {"%2s", "\u263a", " ☺"}, |
| {"%-5s", "abc", "abc "}, |
| {"%-8q", "abc", `"abc" `}, |
| {"%05s", "abc", "00abc"}, |
| {"%08q", "abc", `000"abc"`}, |
| {"%5s", "abcdefghijklmnopqrstuvwxyz", "abcdefghijklmnopqrstuvwxyz"}, |
| {"%.5s", "abcdefghijklmnopqrstuvwxyz", "abcde"}, |
| {"%.5s", "日本語日本語", "日本語日本"}, |
| {"%.5s", []byte("日本語日本語"), "日本語日本"}, |
| {"%.5q", "abcdefghijklmnopqrstuvwxyz", `"abcde"`}, |
| {"%.3q", "日本語日本語", `"日本語"`}, |
| {"%.3q", []byte("日本語日本語"), `"日本語"`}, |
| {"%10.1q", "日本語日本語", ` "日"`}, |
| |
| // integers |
| {"%d", 12345, "12345"}, |
| {"%d", -12345, "-12345"}, |
| {"%10d", 12345, " 12345"}, |
| {"%10d", -12345, " -12345"}, |
| {"%+10d", 12345, " +12345"}, |
| {"%010d", 12345, "0000012345"}, |
| {"%010d", -12345, "-000012345"}, |
| {"%-10d", 12345, "12345 "}, |
| {"%010.3d", 1, " 001"}, |
| {"%010.3d", -1, " -001"}, |
| {"%+d", 12345, "+12345"}, |
| {"%+d", -12345, "-12345"}, |
| {"%+d", 0, "+0"}, |
| {"% d", 0, " 0"}, |
| {"% d", 12345, " 12345"}, |
| {"%.0d", 0, ""}, |
| {"%.d", 0, ""}, |
| |
| // unicode format |
| {"%U", 0x1, "U+0001"}, |
| {"%U", uint(0x1), "U+0001"}, |
| {"%.8U", 0x2, "U+00000002"}, |
| {"%U", 0x1234, "U+1234"}, |
| {"%U", 0x12345, "U+12345"}, |
| {"%10.6U", 0xABC, " U+000ABC"}, |
| {"%-10.6U", 0xABC, "U+000ABC "}, |
| {"%U", '\n', `U+000A`}, |
| {"%#U", '\n', `U+000A`}, |
| {"%U", 'x', `U+0078`}, |
| {"%#U", 'x', `U+0078 'x'`}, |
| {"%U", '\u263a', `U+263A`}, |
| {"%#U", '\u263a', `U+263A '☺'`}, |
| |
| // floats |
| {"%+.3e", 0.0, "+0.000e+00"}, |
| {"%+.3e", 1.0, "+1.000e+00"}, |
| {"%+.3f", -1.0, "-1.000"}, |
| {"% .3E", -1.0, "-1.000E+00"}, |
| {"% .3e", 1.0, " 1.000e+00"}, |
| {"%+.3g", 0.0, "+0"}, |
| {"%+.3g", 1.0, "+1"}, |
| {"%+.3g", -1.0, "-1"}, |
| {"% .3g", -1.0, "-1"}, |
| {"% .3g", 1.0, " 1"}, |
| |
| // complex values |
| {"%+.3e", 0i, "(+0.000e+00+0.000e+00i)"}, |
| {"%+.3f", 0i, "(+0.000+0.000i)"}, |
| {"%+.3g", 0i, "(+0+0i)"}, |
| {"%+.3e", 1 + 2i, "(+1.000e+00+2.000e+00i)"}, |
| {"%+.3f", 1 + 2i, "(+1.000+2.000i)"}, |
| {"%+.3g", 1 + 2i, "(+1+2i)"}, |
| {"%.3e", 0i, "(0.000e+00+0.000e+00i)"}, |
| {"%.3f", 0i, "(0.000+0.000i)"}, |
| {"%.3g", 0i, "(0+0i)"}, |
| {"%.3e", 1 + 2i, "(1.000e+00+2.000e+00i)"}, |
| {"%.3f", 1 + 2i, "(1.000+2.000i)"}, |
| {"%.3g", 1 + 2i, "(1+2i)"}, |
| {"%.3e", -1 - 2i, "(-1.000e+00-2.000e+00i)"}, |
| {"%.3f", -1 - 2i, "(-1.000-2.000i)"}, |
| {"%.3g", -1 - 2i, "(-1-2i)"}, |
| {"% .3E", -1 - 2i, "(-1.000E+00-2.000E+00i)"}, |
| {"%+.3g", complex64(1 + 2i), "(+1+2i)"}, |
| {"%+.3g", complex128(1 + 2i), "(+1+2i)"}, |
| |
| // erroneous formats |
| {"", 2, "%!(EXTRA int=2)"}, |
| {"%d", "hello", "%!d(string=hello)"}, |
| |
| // old test/fmt_test.go |
| {"%d", 1234, "1234"}, |
| {"%d", -1234, "-1234"}, |
| {"%d", uint(1234), "1234"}, |
| {"%d", uint32(b32), "4294967295"}, |
| {"%d", uint64(b64), "18446744073709551615"}, |
| {"%o", 01234, "1234"}, |
| {"%#o", 01234, "01234"}, |
| {"%o", uint32(b32), "37777777777"}, |
| {"%o", uint64(b64), "1777777777777777777777"}, |
| {"%x", 0x1234abcd, "1234abcd"}, |
| {"%#x", 0x1234abcd, "0x1234abcd"}, |
| {"%x", b32 - 0x1234567, "fedcba98"}, |
| {"%X", 0x1234abcd, "1234ABCD"}, |
| {"%X", b32 - 0x1234567, "FEDCBA98"}, |
| {"%#X", 0, "0X0"}, |
| {"%x", b64, "ffffffffffffffff"}, |
| {"%b", 7, "111"}, |
| {"%b", b64, "1111111111111111111111111111111111111111111111111111111111111111"}, |
| {"%b", -6, "-110"}, |
| {"%e", 1.0, "1.000000e+00"}, |
| {"%e", 1234.5678e3, "1.234568e+06"}, |
| {"%e", 1234.5678e-8, "1.234568e-05"}, |
| {"%e", -7.0, "-7.000000e+00"}, |
| {"%e", -1e-9, "-1.000000e-09"}, |
| {"%f", 1234.5678e3, "1234567.800000"}, |
| {"%f", 1234.5678e-8, "0.000012"}, |
| {"%f", -7.0, "-7.000000"}, |
| {"%f", -1e-9, "-0.000000"}, |
| {"%g", 1234.5678e3, "1.2345678e+06"}, |
| {"%g", float32(1234.5678e3), "1.2345678e+06"}, |
| {"%g", 1234.5678e-8, "1.2345678e-05"}, |
| {"%g", -7.0, "-7"}, |
| {"%g", -1e-9, "-1e-09"}, |
| {"%g", float32(-1e-9), "-1e-09"}, |
| {"%E", 1.0, "1.000000E+00"}, |
| {"%E", 1234.5678e3, "1.234568E+06"}, |
| {"%E", 1234.5678e-8, "1.234568E-05"}, |
| {"%E", -7.0, "-7.000000E+00"}, |
| {"%E", -1e-9, "-1.000000E-09"}, |
| {"%G", 1234.5678e3, "1.2345678E+06"}, |
| {"%G", float32(1234.5678e3), "1.2345678E+06"}, |
| {"%G", 1234.5678e-8, "1.2345678E-05"}, |
| {"%G", -7.0, "-7"}, |
| {"%G", -1e-9, "-1E-09"}, |
| {"%G", float32(-1e-9), "-1E-09"}, |
| {"%c", 'x', "x"}, |
| {"%c", 0xe4, "ä"}, |
| {"%c", 0x672c, "本"}, |
| {"%c", '日', "日"}, |
| {"%20.8d", 1234, " 00001234"}, |
| {"%20.8d", -1234, " -00001234"}, |
| {"%20d", 1234, " 1234"}, |
| {"%-20.8d", 1234, "00001234 "}, |
| {"%-20.8d", -1234, "-00001234 "}, |
| {"%-#20.8x", 0x1234abc, "0x01234abc "}, |
| {"%-#20.8X", 0x1234abc, "0X01234ABC "}, |
| {"%-#20.8o", 01234, "00001234 "}, |
| {"%.20b", 7, "00000000000000000111"}, |
| {"%20.5s", "qwertyuiop", " qwert"}, |
| {"%.5s", "qwertyuiop", "qwert"}, |
| {"%-20.5s", "qwertyuiop", "qwert "}, |
| {"%20c", 'x', " x"}, |
| {"%-20c", 'x', "x "}, |
| {"%20.6e", 1.2345e3, " 1.234500e+03"}, |
| {"%20.6e", 1.2345e-3, " 1.234500e-03"}, |
| {"%20e", 1.2345e3, " 1.234500e+03"}, |
| {"%20e", 1.2345e-3, " 1.234500e-03"}, |
| {"%20.8e", 1.2345e3, " 1.23450000e+03"}, |
| {"%20f", 1.23456789e3, " 1234.567890"}, |
| {"%20f", 1.23456789e-3, " 0.001235"}, |
| {"%20f", 12345678901.23456789, " 12345678901.234568"}, |
| {"%-20f", 1.23456789e3, "1234.567890 "}, |
| {"%20.8f", 1.23456789e3, " 1234.56789000"}, |
| {"%20.8f", 1.23456789e-3, " 0.00123457"}, |
| {"%g", 1.23456789e3, "1234.56789"}, |
| {"%g", 1.23456789e-3, "0.00123456789"}, |
| {"%g", 1.23456789e20, "1.23456789e+20"}, |
| {"%20e", math.Inf(1), " +Inf"}, |
| {"%-20f", math.Inf(-1), "-Inf "}, |
| {"%20g", math.NaN(), " NaN"}, |
| |
| // arrays |
| {"%v", array, "[1 2 3 4 5]"}, |
| {"%v", iarray, "[1 hello 2.5 <nil>]"}, |
| {"%v", &array, "&[1 2 3 4 5]"}, |
| {"%v", &iarray, "&[1 hello 2.5 <nil>]"}, |
| |
| // complexes with %v |
| {"%v", 1 + 2i, "(1+2i)"}, |
| {"%v", complex64(1 + 2i), "(1+2i)"}, |
| {"%v", complex128(1 + 2i), "(1+2i)"}, |
| |
| // structs |
| {"%v", A{1, 2, "a", []int{1, 2}}, `{1 2 a [1 2]}`}, |
| {"%+v", A{1, 2, "a", []int{1, 2}}, `{i:1 j:2 s:a x:[1 2]}`}, |
| |
| // +v on structs with Stringable items |
| {"%+v", B{1, 2}, `{I:<1> j:2}`}, |
| {"%+v", C{1, B{2, 3}}, `{i:1 B:{I:<2> j:3}}`}, |
| |
| // q on Stringable items |
| {"%s", I(23), `<23>`}, |
| {"%q", I(23), `"<23>"`}, |
| {"%x", I(23), `3c32333e`}, |
| {"%d", I(23), `%!d(string=<23>)`}, |
| |
| // go syntax |
| {"%#v", A{1, 2, "a", []int{1, 2}}, `fmt_test.A{i:1, j:0x2, s:"a", x:[]int{1, 2}}`}, |
| {"%#v", &b, "(*uint8)(0xPTR)"}, |
| {"%#v", TestFmtInterface, "(func(*testing.T))(0xPTR)"}, |
| {"%#v", make(chan int), "(chan int)(0xPTR)"}, |
| {"%#v", uint64(1<<64 - 1), "0xffffffffffffffff"}, |
| {"%#v", 1000000000, "1000000000"}, |
| {"%#v", map[string]int{"a": 1}, `map[string] int{"a":1}`}, |
| {"%#v", map[string]B{"a": {1, 2}}, `map[string] fmt_test.B{"a":fmt_test.B{I:1, j:2}}`}, |
| {"%#v", []string{"a", "b"}, `[]string{"a", "b"}`}, |
| {"%#v", SI{}, `fmt_test.SI{I:interface { }(nil)}`}, |
| |
| // slices with other formats |
| {"%#x", []int{1, 2, 15}, `[0x1 0x2 0xf]`}, |
| {"%x", []int{1, 2, 15}, `[1 2 f]`}, |
| {"%d", []int{1, 2, 15}, `[1 2 15]`}, |
| {"%d", []byte{1, 2, 15}, `[1 2 15]`}, |
| {"%q", []string{"a", "b"}, `["a" "b"]`}, |
| |
| // renamings |
| {"%v", renamedBool(true), "true"}, |
| {"%d", renamedBool(true), "%!d(fmt_test.renamedBool=true)"}, |
| {"%o", renamedInt(8), "10"}, |
| {"%d", renamedInt8(-9), "-9"}, |
| {"%v", renamedInt16(10), "10"}, |
| {"%v", renamedInt32(-11), "-11"}, |
| {"%X", renamedInt64(255), "FF"}, |
| {"%v", renamedUint(13), "13"}, |
| {"%o", renamedUint8(14), "16"}, |
| {"%X", renamedUint16(15), "F"}, |
| {"%d", renamedUint32(16), "16"}, |
| {"%X", renamedUint64(17), "11"}, |
| {"%o", renamedUintptr(18), "22"}, |
| {"%x", renamedString("thing"), "7468696e67"}, |
| {"%d", renamedBytes([]byte{1, 2, 15}), `[1 2 15]`}, |
| {"%q", renamedBytes([]byte("hello")), `"hello"`}, |
| {"%v", renamedFloat32(22), "22"}, |
| {"%v", renamedFloat64(33), "33"}, |
| {"%v", renamedComplex64(3 + 4i), "(3+4i)"}, |
| {"%v", renamedComplex128(4 - 3i), "(4-3i)"}, |
| |
| // Formatter |
| {"%x", F(1), "<x=F(1)>"}, |
| {"%x", G(2), "2"}, |
| {"%+v", S{F(4), G(5)}, "{F:<v=F(4)> G:5}"}, |
| |
| // GoStringer |
| {"%#v", G(6), "GoString(6)"}, |
| {"%#v", S{F(7), G(8)}, "fmt_test.S{F:<v=F(7)>, G:GoString(8)}"}, |
| |
| // %T |
| {"%T", (4 - 3i), "complex128"}, |
| {"%T", renamedComplex128(4 - 3i), "fmt_test.renamedComplex128"}, |
| {"%T", intVal, "int"}, |
| {"%6T", &intVal, " *int"}, |
| |
| // %p |
| {"p0=%p", new(int), "p0=0xPTR"}, |
| {"p1=%s", &pValue, "p1=String(p)"}, // String method... |
| {"p2=%p", &pValue, "p2=0xPTR"}, // ... not called with %p |
| {"p4=%#p", new(int), "p4=PTR"}, |
| |
| // %p on non-pointers |
| {"%p", make(chan int), "0xPTR"}, |
| {"%p", make(map[int]int), "0xPTR"}, |
| {"%p", make([]int, 1), "0xPTR"}, |
| {"%p", 27, "%!p(int=27)"}, // not a pointer at all |
| |
| // erroneous things |
| {"%s %", "hello", "hello %!(NOVERB)"}, |
| {"%s %.2", "hello", "hello %!(NOVERB)"}, |
| {"%d", "hello", "%!d(string=hello)"}, |
| {"no args", "hello", "no args%!(EXTRA string=hello)"}, |
| {"%s", nil, "%!s(<nil>)"}, |
| {"%T", nil, "<nil>"}, |
| {"%-1", 100, "%!(NOVERB)%!(EXTRA int=100)"}, |
| } |
| |
| func TestSprintf(t *testing.T) { |
| for _, tt := range fmttests { |
| s := Sprintf(tt.fmt, tt.val) |
| if i := strings.Index(tt.out, "PTR"); i >= 0 { |
| j := i |
| for ; j < len(s); j++ { |
| c := s[j] |
| if (c < '0' || c > '9') && (c < 'a' || c > 'f') && (c < 'A' || c > 'F') { |
| break |
| } |
| } |
| s = s[0:i] + "PTR" + s[j:] |
| } |
| if s != tt.out { |
| if _, ok := tt.val.(string); ok { |
| // Don't requote the already-quoted strings. |
| // It's too confusing to read the errors. |
| t.Errorf("Sprintf(%q, %q) = <%s> want <%s>", tt.fmt, tt.val, s, tt.out) |
| } else { |
| t.Errorf("Sprintf(%q, %v) = %q want %q", tt.fmt, tt.val, s, tt.out) |
| } |
| } |
| } |
| } |
| |
| func BenchmarkSprintfEmpty(b *testing.B) { |
| for i := 0; i < b.N; i++ { |
| Sprintf("") |
| } |
| } |
| |
| func BenchmarkSprintfString(b *testing.B) { |
| for i := 0; i < b.N; i++ { |
| Sprintf("%s", "hello") |
| } |
| } |
| |
| func BenchmarkSprintfInt(b *testing.B) { |
| for i := 0; i < b.N; i++ { |
| Sprintf("%d", 5) |
| } |
| } |
| |
| func BenchmarkSprintfIntInt(b *testing.B) { |
| for i := 0; i < b.N; i++ { |
| Sprintf("%d %d", 5, 6) |
| } |
| } |
| |
| func BenchmarkSprintfPrefixedInt(b *testing.B) { |
| for i := 0; i < b.N; i++ { |
| Sprintf("This is some meaningless prefix text that needs to be scanned %d", 6) |
| } |
| } |
| |
| func TestCountMallocs(t *testing.T) { |
| if testing.Short() { |
| return |
| } |
| runtime.UpdateMemStats() |
| mallocs := 0 - runtime.MemStats.Mallocs |
| for i := 0; i < 100; i++ { |
| Sprintf("") |
| } |
| runtime.UpdateMemStats() |
| mallocs += runtime.MemStats.Mallocs |
| Printf("mallocs per Sprintf(\"\"): %d\n", mallocs/100) |
| runtime.UpdateMemStats() |
| mallocs = 0 - runtime.MemStats.Mallocs |
| for i := 0; i < 100; i++ { |
| Sprintf("xxx") |
| } |
| runtime.UpdateMemStats() |
| mallocs += runtime.MemStats.Mallocs |
| Printf("mallocs per Sprintf(\"xxx\"): %d\n", mallocs/100) |
| runtime.UpdateMemStats() |
| mallocs = 0 - runtime.MemStats.Mallocs |
| for i := 0; i < 100; i++ { |
| Sprintf("%x", i) |
| } |
| runtime.UpdateMemStats() |
| mallocs += runtime.MemStats.Mallocs |
| Printf("mallocs per Sprintf(\"%%x\"): %d\n", mallocs/100) |
| runtime.UpdateMemStats() |
| mallocs = 0 - runtime.MemStats.Mallocs |
| for i := 0; i < 100; i++ { |
| Sprintf("%s", "hello") |
| } |
| runtime.UpdateMemStats() |
| mallocs += runtime.MemStats.Mallocs |
| Printf("mallocs per Sprintf(\"%%s\"): %d\n", mallocs/100) |
| runtime.UpdateMemStats() |
| mallocs = 0 - runtime.MemStats.Mallocs |
| for i := 0; i < 100; i++ { |
| Sprintf("%x %x", i, i) |
| } |
| runtime.UpdateMemStats() |
| mallocs += runtime.MemStats.Mallocs |
| Printf("mallocs per Sprintf(\"%%x %%x\"): %d\n", mallocs/100) |
| buf := new(bytes.Buffer) |
| runtime.UpdateMemStats() |
| mallocs = 0 - runtime.MemStats.Mallocs |
| for i := 0; i < 100; i++ { |
| buf.Reset() |
| Fprintf(buf, "%x %x %x", i, i, i) |
| } |
| runtime.UpdateMemStats() |
| mallocs += runtime.MemStats.Mallocs |
| Printf("mallocs per Fprintf(buf, \"%%x %%x %%x\"): %d\n", mallocs/100) |
| runtime.UpdateMemStats() |
| mallocs = 0 - runtime.MemStats.Mallocs |
| for i := 0; i < 100; i++ { |
| buf.Reset() |
| Fprintf(buf, "%s", "hello") |
| } |
| runtime.UpdateMemStats() |
| mallocs += runtime.MemStats.Mallocs |
| Printf("mallocs per Fprintf(buf, \"%%s\"): %d\n", mallocs/100) |
| } |
| |
| type flagPrinter struct{} |
| |
| func (*flagPrinter) Format(f State, c int) { |
| s := "%" |
| for i := 0; i < 128; i++ { |
| if f.Flag(i) { |
| s += string(i) |
| } |
| } |
| if w, ok := f.Width(); ok { |
| s += Sprintf("%d", w) |
| } |
| if p, ok := f.Precision(); ok { |
| s += Sprintf(".%d", p) |
| } |
| s += string(c) |
| io.WriteString(f, "["+s+"]") |
| } |
| |
| var flagtests = []struct { |
| in string |
| out string |
| }{ |
| {"%a", "[%a]"}, |
| {"%-a", "[%-a]"}, |
| {"%+a", "[%+a]"}, |
| {"%#a", "[%#a]"}, |
| {"% a", "[% a]"}, |
| {"%0a", "[%0a]"}, |
| {"%1.2a", "[%1.2a]"}, |
| {"%-1.2a", "[%-1.2a]"}, |
| {"%+1.2a", "[%+1.2a]"}, |
| {"%-+1.2a", "[%+-1.2a]"}, |
| {"%-+1.2abc", "[%+-1.2a]bc"}, |
| {"%-1.2abc", "[%-1.2a]bc"}, |
| } |
| |
| func TestFlagParser(t *testing.T) { |
| var flagprinter flagPrinter |
| for _, tt := range flagtests { |
| s := Sprintf(tt.in, &flagprinter) |
| if s != tt.out { |
| t.Errorf("Sprintf(%q, &flagprinter) => %q, want %q", tt.in, s, tt.out) |
| } |
| } |
| } |
| |
| func TestStructPrinter(t *testing.T) { |
| var s struct { |
| a string |
| b string |
| c int |
| } |
| s.a = "abc" |
| s.b = "def" |
| s.c = 123 |
| var tests = []struct { |
| fmt string |
| out string |
| }{ |
| {"%v", "{abc def 123}"}, |
| {"%+v", "{a:abc b:def c:123}"}, |
| } |
| for _, tt := range tests { |
| out := Sprintf(tt.fmt, s) |
| if out != tt.out { |
| t.Errorf("Sprintf(%q, &s) = %q, want %q", tt.fmt, out, tt.out) |
| } |
| } |
| } |
| |
| // Check map printing using substrings so we don't depend on the print order. |
| func presentInMap(s string, a []string, t *testing.T) { |
| for i := 0; i < len(a); i++ { |
| loc := strings.Index(s, a[i]) |
| if loc < 0 { |
| t.Errorf("map print: expected to find %q in %q", a[i], s) |
| } |
| // make sure the match ends here |
| loc += len(a[i]) |
| if loc >= len(s) || (s[loc] != ' ' && s[loc] != ']') { |
| t.Errorf("map print: %q not properly terminated in %q", a[i], s) |
| } |
| } |
| } |
| |
| func TestMapPrinter(t *testing.T) { |
| m0 := make(map[int]string) |
| s := Sprint(m0) |
| if s != "map[]" { |
| t.Errorf("empty map printed as %q not %q", s, "map[]") |
| } |
| m1 := map[int]string{1: "one", 2: "two", 3: "three"} |
| a := []string{"1:one", "2:two", "3:three"} |
| presentInMap(Sprintf("%v", m1), a, t) |
| presentInMap(Sprint(m1), a, t) |
| } |
| |
| func TestEmptyMap(t *testing.T) { |
| const emptyMapStr = "map[]" |
| var m map[string]int |
| s := Sprint(m) |
| if s != emptyMapStr { |
| t.Errorf("nil map printed as %q not %q", s, emptyMapStr) |
| } |
| m = make(map[string]int) |
| s = Sprint(m) |
| if s != emptyMapStr { |
| t.Errorf("empty map printed as %q not %q", s, emptyMapStr) |
| } |
| } |
| |
| // Check that Sprint (and hence Print, Fprint) puts spaces in the right places, |
| // that is, between arg pairs in which neither is a string. |
| func TestBlank(t *testing.T) { |
| got := Sprint("<", 1, ">:", 1, 2, 3, "!") |
| expect := "<1>:1 2 3!" |
| if got != expect { |
| t.Errorf("got %q expected %q", got, expect) |
| } |
| } |
| |
| // Check that Sprintln (and hence Println, Fprintln) puts spaces in the right places, |
| // that is, between all arg pairs. |
| func TestBlankln(t *testing.T) { |
| got := Sprintln("<", 1, ">:", 1, 2, 3, "!") |
| expect := "< 1 >: 1 2 3 !\n" |
| if got != expect { |
| t.Errorf("got %q expected %q", got, expect) |
| } |
| } |
| |
| // Check Formatter with Sprint, Sprintln, Sprintf |
| func TestFormatterPrintln(t *testing.T) { |
| f := F(1) |
| expect := "<v=F(1)>\n" |
| s := Sprint(f, "\n") |
| if s != expect { |
| t.Errorf("Sprint wrong with Formatter: expected %q got %q", expect, s) |
| } |
| s = Sprintln(f) |
| if s != expect { |
| t.Errorf("Sprintln wrong with Formatter: expected %q got %q", expect, s) |
| } |
| s = Sprintf("%v\n", f) |
| if s != expect { |
| t.Errorf("Sprintf wrong with Formatter: expected %q got %q", expect, s) |
| } |
| } |
| |
| func args(a ...interface{}) []interface{} { return a } |
| |
| var startests = []struct { |
| fmt string |
| in []interface{} |
| out string |
| }{ |
| {"%*d", args(4, 42), " 42"}, |
| {"%.*d", args(4, 42), "0042"}, |
| {"%*.*d", args(8, 4, 42), " 0042"}, |
| {"%0*d", args(4, 42), "0042"}, |
| {"%-*d", args(4, 42), "42 "}, |
| |
| // erroneous |
| {"%*d", args(nil, 42), "%!(BADWIDTH)42"}, |
| {"%.*d", args(nil, 42), "%!(BADPREC)42"}, |
| {"%*d", args(5, "foo"), "%!d(string= foo)"}, |
| {"%*% %d", args(20, 5), "% 5"}, |
| {"%*", args(4), "%!(NOVERB)"}, |
| {"%*d", args(int32(4), 42), "%!(BADWIDTH)42"}, |
| } |
| |
| func TestWidthAndPrecision(t *testing.T) { |
| for _, tt := range startests { |
| s := Sprintf(tt.fmt, tt.in...) |
| if s != tt.out { |
| t.Errorf("%q: got %q expected %q", tt.fmt, s, tt.out) |
| } |
| } |
| } |
| |
| // A type that panics in String. |
| type Panic struct { |
| message interface{} |
| } |
| |
| // Value receiver. |
| func (p Panic) GoString() string { |
| panic(p.message) |
| } |
| |
| // Value receiver. |
| func (p Panic) String() string { |
| panic(p.message) |
| } |
| |
| // A type that panics in Format. |
| type PanicF struct { |
| message interface{} |
| } |
| |
| // Value receiver. |
| func (p PanicF) Format(f State, c int) { |
| panic(p.message) |
| } |
| |
| var panictests = []struct { |
| fmt string |
| in interface{} |
| out string |
| }{ |
| // String |
| {"%d", (*Panic)(nil), "<nil>"}, // nil pointer special case |
| {"%d", Panic{io.ErrUnexpectedEOF}, "%d(PANIC=unexpected EOF)"}, |
| {"%d", Panic{3}, "%d(PANIC=3)"}, |
| // GoString |
| {"%#v", (*Panic)(nil), "<nil>"}, // nil pointer special case |
| {"%#v", Panic{io.ErrUnexpectedEOF}, "%v(PANIC=unexpected EOF)"}, |
| {"%#v", Panic{3}, "%v(PANIC=3)"}, |
| // Format |
| {"%s", (*PanicF)(nil), "<nil>"}, // nil pointer special case |
| {"%s", PanicF{io.ErrUnexpectedEOF}, "%s(PANIC=unexpected EOF)"}, |
| {"%s", PanicF{3}, "%s(PANIC=3)"}, |
| } |
| |
| func TestPanics(t *testing.T) { |
| for _, tt := range panictests { |
| s := Sprintf(tt.fmt, tt.in) |
| if s != tt.out { |
| t.Errorf("%q: got %q expected %q", tt.fmt, s, tt.out) |
| } |
| } |
| } |