| // 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" |
| "strings" |
| "testing" |
| "time" |
| "unicode" |
| ) |
| |
| 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 = [5]int{1, 2, 3, 4, 5} |
| var iarray = [4]interface{}{1, "hello", 2.5, nil} |
| var slice = array[:] |
| var islice = iarray[:] |
| |
| 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 rune) { |
| 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{} |
| } |
| |
| // P is 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 barray = [5]renamedUint8{1, 2, 3, 4, 5} |
| var bslice = barray[:] |
| |
| type byteStringer byte |
| |
| func (byteStringer) String() string { return "X" } |
| |
| var byteStringerSlice = []byteStringer{97, 98, 99, 100} |
| |
| type byteFormatter byte |
| |
| func (byteFormatter) Format(f State, _ rune) { |
| Fprint(f, "X") |
| } |
| |
| var byteFormatterSlice = []byteFormatter{97, 98, 99, 100} |
| |
| 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"`}, |
| {"%#x", []byte("abc\xff"), "0x616263ff"}, |
| {"%#X", []byte("abc\xff"), "0X616263FF"}, |
| {"%# x", []byte("abc\xff"), "0x61 0x62 0x63 0xff"}, |
| {"%# X", []byte("abc\xff"), "0X61 0X62 0X63 0XFF"}, |
| |
| // basic bytes |
| {"%s", []byte("abc"), "abc"}, |
| {"%x", []byte("abc"), "616263"}, |
| {"% x", []byte("abc\xff"), "61 62 63 ff"}, |
| {"%#x", []byte("abc\xff"), "0x616263ff"}, |
| {"%#X", []byte("abc\xff"), "0X616263FF"}, |
| {"%# x", []byte("abc\xff"), "0x61 0x62 0x63 0xff"}, |
| {"%# X", []byte("abc\xff"), "0X61 0X62 0X63 0XFF"}, |
| {"% 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"`}, |
| {"%.5x", "abcdefghijklmnopqrstuvwxyz", `6162636465`}, |
| {"%.5q", []byte("abcdefghijklmnopqrstuvwxyz"), `"abcde"`}, |
| {"%.5x", []byte("abcdefghijklmnopqrstuvwxyz"), `6162636465`}, |
| {"%.3q", "日本語日本語", `"日本語"`}, |
| {"%.3q", []byte("日本語日本語"), `"日本語"`}, |
| {"%.1q", "日本語", `"日"`}, |
| {"%.1q", []byte("日本語"), `"日"`}, |
| {"%.1x", "日本語", `e6`}, |
| {"%.1X", []byte("日本語"), `E6`}, |
| {"%10.1q", "日本語日本語", ` "日"`}, |
| {"%3c", '⌘', " ⌘"}, |
| {"%5q", '\u2026', ` '…'`}, |
| {"%10v", nil, " <nil>"}, |
| {"%-10v", nil, "<nil> "}, |
| |
| // 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"}, |
| {"%+.3F", -1.0, "-1.000"}, |
| {"%+.3F", float32(-1.0), "-1.000"}, |
| {"%+07.2f", 1.0, "+001.00"}, |
| {"%+07.2f", -1.0, "-001.00"}, |
| {"%+10.2f", +1.0, " +1.00"}, |
| {"%+10.2f", -1.0, " -1.00"}, |
| {"% .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"}, |
| {"%b", float32(1.0), "8388608p-23"}, |
| {"%b", 1.0, "4503599627370496p-52"}, |
| |
| // 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)"}, |
| {"%.3F", 0i, "(0.000+0.000i)"}, |
| {"%.3F", complex64(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)"}, |
| {"%b", complex64(1 + 2i), "(8388608p-23+8388608p-22i)"}, |
| {"%b", 1 + 2i, "(4503599627370496p-52+4503599627370496p-51i)"}, |
| |
| // 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", barray, "[1 2 3 4 5]"}, |
| {"%v", &array, "&[1 2 3 4 5]"}, |
| {"%v", &iarray, "&[1 hello 2.5 <nil>]"}, |
| {"%v", &barray, "&[1 2 3 4 5]"}, |
| |
| // slices |
| {"%v", slice, "[1 2 3 4 5]"}, |
| {"%v", islice, "[1 hello 2.5 <nil>]"}, |
| {"%v", bslice, "[1 2 3 4 5]"}, |
| {"%v", &slice, "&[1 2 3 4 5]"}, |
| {"%v", &islice, "&[1 hello 2.5 <nil>]"}, |
| {"%v", &bslice, "&[1 2 3 4 5]"}, |
| |
| // 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}}`}, |
| |
| // other formats on Stringable items |
| {"%s", I(23), `<23>`}, |
| {"%q", I(23), `"<23>"`}, |
| {"%x", I(23), `3c32333e`}, |
| {"%#x", I(23), `0x3c32333e`}, |
| {"%# x", I(23), `0x3c 0x32 0x33 0x3e`}, |
| {"%d", I(23), `23`}, // Stringer applies only to string formats. |
| |
| // 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)}`}, |
| {"%#v", []int(nil), `[]int(nil)`}, |
| {"%#v", []int{}, `[]int{}`}, |
| {"%#v", array, `[5]int{1, 2, 3, 4, 5}`}, |
| {"%#v", &array, `&[5]int{1, 2, 3, 4, 5}`}, |
| {"%#v", iarray, `[4]interface {}{1, "hello", 2.5, interface {}(nil)}`}, |
| {"%#v", &iarray, `&[4]interface {}{1, "hello", 2.5, interface {}(nil)}`}, |
| {"%#v", map[int]byte(nil), `map[int]uint8(nil)`}, |
| {"%#v", map[int]byte{}, `map[int]uint8{}`}, |
| {"%#v", "foo", `"foo"`}, |
| {"%#v", barray, `[5]fmt_test.renamedUint8{0x1, 0x2, 0x3, 0x4, 0x5}`}, |
| {"%#v", bslice, `[]fmt_test.renamedUint8{0x1, 0x2, 0x3, 0x4, 0x5}`}, |
| {"%#v", []byte(nil), "[]byte(nil)"}, |
| {"%#v", []int32(nil), "[]int32(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"`}, |
| {"%x", []renamedUint8{'a', 'b', 'c'}, "616263"}, |
| {"%s", []renamedUint8{'h', 'e', 'l', 'l', 'o'}, "hello"}, |
| {"%q", []renamedUint8{'h', 'e', 'l', 'l', 'o'}, `"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"}, |
| {"%10T", nil, " <nil>"}, |
| {"%-10T", nil, "<nil> "}, |
| |
| // %p |
| {"p0=%p", new(int), "p0=0xPTR"}, |
| {"p1=%s", &pValue, "p1=String(p)"}, // String method... |
| {"p2=%p", &pValue, "p2=0xPTR"}, // ... not called with %p |
| {"p3=%p", (*int)(nil), "p3=0x0"}, |
| {"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 |
| |
| // %q on pointers |
| {"%q", (*int)(nil), "%!q(*int=<nil>)"}, |
| {"%q", new(int), "%!q(*int=0xPTR)"}, |
| |
| // %v on pointers formats 0 as <nil> |
| {"%v", (*int)(nil), "<nil>"}, |
| {"%v", new(int), "0xPTR"}, |
| |
| // %d etc. pointers use specified base. |
| {"%d", new(int), "PTR_d"}, |
| {"%o", new(int), "PTR_o"}, |
| {"%x", new(int), "PTR_x"}, |
| |
| // %d on Stringer should give integer if possible |
| {"%s", time.Time{}.Month(), "January"}, |
| {"%d", time.Time{}.Month(), "1"}, |
| |
| // 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)"}, |
| |
| // The "<nil>" show up because maps are printed by |
| // first obtaining a list of keys and then looking up |
| // each key. Since NaNs can be map keys but cannot |
| // be fetched directly, the lookup fails and returns a |
| // zero reflect.Value, which formats as <nil>. |
| // This test is just to check that it shows the two NaNs at all. |
| {"%v", map[float64]int{math.NaN(): 1, math.NaN(): 2}, "map[NaN:<nil> NaN:<nil>]"}, |
| |
| // Used to crash because nByte didn't allow for a sign. |
| {"%b", int64(-1 << 63), zeroFill("-1", 63, "")}, |
| |
| // Used to panic. |
| {"%0100d", 1, zeroFill("", 100, "1")}, |
| {"%0100d", -1, zeroFill("-", 99, "1")}, |
| {"%0.100f", 1.0, zeroFill("1.", 100, "")}, |
| {"%0.100f", -1.0, zeroFill("-1.", 100, "")}, |
| |
| // Comparison of padding rules with C printf. |
| /* |
| C program: |
| #include <stdio.h> |
| |
| char *format[] = { |
| "[%.2f]", |
| "[% .2f]", |
| "[%+.2f]", |
| "[%7.2f]", |
| "[% 7.2f]", |
| "[%+7.2f]", |
| "[%07.2f]", |
| "[% 07.2f]", |
| "[%+07.2f]", |
| }; |
| |
| int main(void) { |
| int i; |
| for(i = 0; i < 9; i++) { |
| printf("%s: ", format[i]); |
| printf(format[i], 1.0); |
| printf(" "); |
| printf(format[i], -1.0); |
| printf("\n"); |
| } |
| } |
| |
| Output: |
| [%.2f]: [1.00] [-1.00] |
| [% .2f]: [ 1.00] [-1.00] |
| [%+.2f]: [+1.00] [-1.00] |
| [%7.2f]: [ 1.00] [ -1.00] |
| [% 7.2f]: [ 1.00] [ -1.00] |
| [%+7.2f]: [ +1.00] [ -1.00] |
| [%07.2f]: [0001.00] [-001.00] |
| [% 07.2f]: [ 001.00] [-001.00] |
| [%+07.2f]: [+001.00] [-001.00] |
| */ |
| {"%.2f", 1.0, "1.00"}, |
| {"%.2f", -1.0, "-1.00"}, |
| {"% .2f", 1.0, " 1.00"}, |
| {"% .2f", -1.0, "-1.00"}, |
| {"%+.2f", 1.0, "+1.00"}, |
| {"%+.2f", -1.0, "-1.00"}, |
| {"%7.2f", 1.0, " 1.00"}, |
| {"%7.2f", -1.0, " -1.00"}, |
| {"% 7.2f", 1.0, " 1.00"}, |
| {"% 7.2f", -1.0, " -1.00"}, |
| {"%+7.2f", 1.0, " +1.00"}, |
| {"%+7.2f", -1.0, " -1.00"}, |
| {"%07.2f", 1.0, "0001.00"}, |
| {"%07.2f", -1.0, "-001.00"}, |
| {"% 07.2f", 1.0, " 001.00"}, |
| {"% 07.2f", -1.0, "-001.00"}, |
| {"%+07.2f", 1.0, "+001.00"}, |
| {"%+07.2f", -1.0, "-001.00"}, |
| |
| // Complex numbers: exhaustively tested in TestComplexFormatting. |
| {"%7.2f", 1 + 2i, "( 1.00 +2.00i)"}, |
| {"%+07.2f", -1 - 2i, "(-001.00-002.00i)"}, |
| // Zero padding does not apply to infinities. |
| {"%020f", math.Inf(-1), " -Inf"}, |
| {"%020f", math.Inf(+1), " +Inf"}, |
| {"% 020f", math.Inf(-1), " -Inf"}, |
| {"% 020f", math.Inf(+1), " Inf"}, |
| {"%+020f", math.Inf(-1), " -Inf"}, |
| {"%+020f", math.Inf(+1), " +Inf"}, |
| {"%20f", -1.0, " -1.000000"}, |
| // Make sure we can handle very large widths. |
| {"%0100f", -1.0, zeroFill("-", 99, "1.000000")}, |
| |
| // Complex fmt used to leave the plus flag set for future entries in the array |
| // causing +2+0i and +3+0i instead of 2+0i and 3+0i. |
| {"%v", []complex64{1, 2, 3}, "[(1+0i) (2+0i) (3+0i)]"}, |
| {"%v", []complex128{1, 2, 3}, "[(1+0i) (2+0i) (3+0i)]"}, |
| |
| // Incomplete format specification caused crash. |
| {"%.", 3, "%!.(int=3)"}, |
| |
| // Used to panic with out-of-bounds for very large numeric representations. |
| // nByte is set to handle one bit per uint64 in %b format, with a negative number. |
| // See issue 6777. |
| {"%#064x", 1, zeroFill("0x", 64, "1")}, |
| {"%#064x", -1, zeroFill("-0x", 63, "1")}, |
| {"%#064b", 1, zeroFill("", 64, "1")}, |
| {"%#064b", -1, zeroFill("-", 63, "1")}, |
| {"%#064o", 1, zeroFill("", 64, "1")}, |
| {"%#064o", -1, zeroFill("-", 63, "1")}, |
| {"%#064d", 1, zeroFill("", 64, "1")}, |
| {"%#064d", -1, zeroFill("-", 63, "1")}, |
| // Test that we handle the crossover above the size of uint64 |
| {"%#072x", 1, zeroFill("0x", 72, "1")}, |
| {"%#072x", -1, zeroFill("-0x", 71, "1")}, |
| {"%#072b", 1, zeroFill("", 72, "1")}, |
| {"%#072b", -1, zeroFill("-", 71, "1")}, |
| {"%#072o", 1, zeroFill("", 72, "1")}, |
| {"%#072o", -1, zeroFill("-", 71, "1")}, |
| {"%#072d", 1, zeroFill("", 72, "1")}, |
| {"%#072d", -1, zeroFill("-", 71, "1")}, |
| |
| // Padding for complex numbers. Has been bad, then fixed, then bad again. |
| {"%+10.2f", +104.66 + 440.51i, "( +104.66 +440.51i)"}, |
| {"%+10.2f", -104.66 + 440.51i, "( -104.66 +440.51i)"}, |
| {"%+10.2f", +104.66 - 440.51i, "( +104.66 -440.51i)"}, |
| {"%+10.2f", -104.66 - 440.51i, "( -104.66 -440.51i)"}, |
| {"%+010.2f", +104.66 + 440.51i, "(+000104.66+000440.51i)"}, |
| {"%+010.2f", -104.66 + 440.51i, "(-000104.66+000440.51i)"}, |
| {"%+010.2f", +104.66 - 440.51i, "(+000104.66-000440.51i)"}, |
| {"%+010.2f", -104.66 - 440.51i, "(-000104.66-000440.51i)"}, |
| |
| // []T where type T is a byte with a Stringer method. |
| {"%v", byteStringerSlice, "[X X X X]"}, |
| {"%s", byteStringerSlice, "abcd"}, |
| {"%q", byteStringerSlice, "\"abcd\""}, |
| {"%x", byteStringerSlice, "61626364"}, |
| {"%#v", byteStringerSlice, "[]fmt_test.byteStringer{0x61, 0x62, 0x63, 0x64}"}, |
| |
| // And the same for Formatter. |
| {"%v", byteFormatterSlice, "[X X X X]"}, |
| {"%s", byteFormatterSlice, "abcd"}, |
| {"%q", byteFormatterSlice, "\"abcd\""}, |
| {"%x", byteFormatterSlice, "61626364"}, |
| // This next case seems wrong, but the docs say the Formatter wins here. |
| {"%#v", byteFormatterSlice, "[]fmt_test.byteFormatter{X, X, X, X}"}, |
| } |
| |
| // zeroFill generates zero-filled strings of the specified width. The length |
| // of the suffix (but not the prefix) is compensated for in the width calculation. |
| func zeroFill(prefix string, width int, suffix string) string { |
| return prefix + strings.Repeat("0", width-len(suffix)) + suffix |
| } |
| |
| func TestSprintf(t *testing.T) { |
| for _, tt := range fmtTests { |
| s := Sprintf(tt.fmt, tt.val) |
| if i := strings.Index(tt.out, "PTR"); i >= 0 { |
| pattern := "PTR" |
| chars := "0123456789abcdefABCDEF" |
| switch { |
| case strings.HasPrefix(tt.out[i:], "PTR_d"): |
| pattern = "PTR_d" |
| chars = chars[:10] |
| case strings.HasPrefix(tt.out[i:], "PTR_o"): |
| pattern = "PTR_o" |
| chars = chars[:8] |
| case strings.HasPrefix(tt.out[i:], "PTR_x"): |
| pattern = "PTR_x" |
| } |
| j := i |
| for ; j < len(s); j++ { |
| c := s[j] |
| if !strings.ContainsRune(chars, rune(c)) { |
| break |
| } |
| } |
| s = s[0:i] + pattern + 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) |
| } |
| } |
| } |
| } |
| |
| // TestComplexFormatting checks that a complex always formats to the same |
| // thing as if done by hand with two singleton prints. |
| func TestComplexFormatting(t *testing.T) { |
| var yesNo = []bool{true, false} |
| var values = []float64{1, 0, -1, math.Inf(1), math.Inf(-1), math.NaN()} |
| for _, plus := range yesNo { |
| for _, zero := range yesNo { |
| for _, space := range yesNo { |
| for _, char := range "fFeEgG" { |
| realFmt := "%" |
| if zero { |
| realFmt += "0" |
| } |
| if space { |
| realFmt += " " |
| } |
| if plus { |
| realFmt += "+" |
| } |
| realFmt += "10.2" |
| realFmt += string(char) |
| // Imaginary part always has a sign, so force + and ignore space. |
| imagFmt := "%" |
| if zero { |
| imagFmt += "0" |
| } |
| imagFmt += "+" |
| imagFmt += "10.2" |
| imagFmt += string(char) |
| for _, realValue := range values { |
| for _, imagValue := range values { |
| one := Sprintf(realFmt, complex(realValue, imagValue)) |
| two := Sprintf("("+realFmt+imagFmt+"i)", realValue, imagValue) |
| if one != two { |
| t.Error(f, one, two) |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| type SE []interface{} // slice of empty; notational compactness. |
| |
| var reorderTests = []struct { |
| fmt string |
| val SE |
| out string |
| }{ |
| {"%[1]d", SE{1}, "1"}, |
| {"%[2]d", SE{2, 1}, "1"}, |
| {"%[2]d %[1]d", SE{1, 2}, "2 1"}, |
| {"%[2]*[1]d", SE{2, 5}, " 2"}, |
| {"%6.2f", SE{12.0}, " 12.00"}, // Explicit version of next line. |
| {"%[3]*.[2]*[1]f", SE{12.0, 2, 6}, " 12.00"}, |
| {"%[1]*.[2]*[3]f", SE{6, 2, 12.0}, " 12.00"}, |
| {"%10f", SE{12.0}, " 12.000000"}, |
| {"%[1]*[3]f", SE{10, 99, 12.0}, " 12.000000"}, |
| {"%.6f", SE{12.0}, "12.000000"}, // Explicit version of next line. |
| {"%.[1]*[3]f", SE{6, 99, 12.0}, "12.000000"}, |
| {"%6.f", SE{12.0}, " 12"}, // // Explicit version of next line; empty precision means zero. |
| {"%[1]*.[3]f", SE{6, 3, 12.0}, " 12"}, |
| // An actual use! Print the same arguments twice. |
| {"%d %d %d %#[1]o %#o %#o", SE{11, 12, 13}, "11 12 13 013 014 015"}, |
| |
| // Erroneous cases. |
| {"%[d", SE{2, 1}, "%!d(BADINDEX)"}, |
| {"%]d", SE{2, 1}, "%!](int=2)d%!(EXTRA int=1)"}, |
| {"%[]d", SE{2, 1}, "%!d(BADINDEX)"}, |
| {"%[-3]d", SE{2, 1}, "%!d(BADINDEX)"}, |
| {"%[99]d", SE{2, 1}, "%!d(BADINDEX)"}, |
| {"%[3]", SE{2, 1}, "%!(NOVERB)"}, |
| {"%[1].2d", SE{5, 6}, "%!d(BADINDEX)"}, |
| {"%[1]2d", SE{2, 1}, "%!d(BADINDEX)"}, |
| {"%3.[2]d", SE{7}, "%!d(BADINDEX)"}, |
| {"%.[2]d", SE{7}, "%!d(BADINDEX)"}, |
| {"%d %d %d %#[1]o %#o %#o %#o", SE{11, 12, 13}, "11 12 13 013 014 015 %!o(MISSING)"}, |
| {"%[5]d %[2]d %d", SE{1, 2, 3}, "%!d(BADINDEX) 2 3"}, |
| {"%d %[3]d %d", SE{1, 2}, "1 %!d(BADINDEX) 2"}, // Erroneous index does not affect sequence. |
| } |
| |
| func TestReorder(t *testing.T) { |
| for _, tt := range reorderTests { |
| s := Sprintf(tt.fmt, tt.val...) |
| if s != tt.out { |
| t.Errorf("Sprintf(%q, %v) = <%s> want <%s>", tt.fmt, tt.val, s, tt.out) |
| } else { |
| } |
| } |
| } |
| |
| func BenchmarkSprintfEmpty(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("") |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfString(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%s", "hello") |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfInt(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%d", 5) |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfIntInt(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%d %d", 5, 6) |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfPrefixedInt(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("This is some meaningless prefix text that needs to be scanned %d", 6) |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfFloat(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%g", 5.23184) |
| } |
| }) |
| } |
| |
| func BenchmarkManyArgs(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| var buf bytes.Buffer |
| for pb.Next() { |
| buf.Reset() |
| Fprintf(&buf, "%2d/%2d/%2d %d:%d:%d %s %s\n", 3, 4, 5, 11, 12, 13, "hello", "world") |
| } |
| }) |
| } |
| |
| func BenchmarkFprintInt(b *testing.B) { |
| var buf bytes.Buffer |
| for i := 0; i < b.N; i++ { |
| buf.Reset() |
| Fprint(&buf, 123456) |
| } |
| } |
| |
| func BenchmarkFprintfBytes(b *testing.B) { |
| data := []byte(string("0123456789")) |
| var buf bytes.Buffer |
| for i := 0; i < b.N; i++ { |
| buf.Reset() |
| Fprintf(&buf, "%s", data) |
| } |
| } |
| |
| func BenchmarkFprintIntNoAlloc(b *testing.B) { |
| var x interface{} = 123456 |
| var buf bytes.Buffer |
| for i := 0; i < b.N; i++ { |
| buf.Reset() |
| Fprint(&buf, x) |
| } |
| } |
| |
| var mallocBuf bytes.Buffer |
| var mallocPointer *int // A pointer so we know the interface value won't allocate. |
| |
| var mallocTest = []struct { |
| count int |
| desc string |
| fn func() |
| }{ |
| {0, `Sprintf("")`, func() { Sprintf("") }}, |
| {1, `Sprintf("xxx")`, func() { Sprintf("xxx") }}, |
| {2, `Sprintf("%x")`, func() { Sprintf("%x", 7) }}, |
| {2, `Sprintf("%s")`, func() { Sprintf("%s", "hello") }}, |
| {3, `Sprintf("%x %x")`, func() { Sprintf("%x %x", 7, 112) }}, |
| {2, `Sprintf("%g")`, func() { Sprintf("%g", float32(3.14159)) }}, // TODO: Can this be 1? |
| {1, `Fprintf(buf, "%s")`, func() { mallocBuf.Reset(); Fprintf(&mallocBuf, "%s", "hello") }}, |
| // If the interface value doesn't need to allocate, amortized allocation overhead should be zero. |
| {0, `Fprintf(buf, "%x %x %x")`, func() { |
| mallocBuf.Reset() |
| Fprintf(&mallocBuf, "%x %x %x", mallocPointer, mallocPointer, mallocPointer) |
| }}, |
| } |
| |
| var _ bytes.Buffer |
| |
| func TestCountMallocs(t *testing.T) { |
| if testing.Short() { |
| t.Skip("skipping malloc count in short mode") |
| } |
| if runtime.GOMAXPROCS(0) > 1 { |
| t.Skip("skipping; GOMAXPROCS>1") |
| } |
| for _, mt := range mallocTest { |
| mallocs := testing.AllocsPerRun(100, mt.fn) |
| if got, max := mallocs, float64(mt.count); got > max { |
| t.Errorf("%s: got %v allocs, want <=%v", mt.desc, got, max) |
| } |
| } |
| } |
| |
| type flagPrinter struct{} |
| |
| func (flagPrinter) Format(f State, c rune) { |
| 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) { |
| type T struct { |
| a string |
| b string |
| c int |
| } |
| var s T |
| 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}"}, |
| {"%#v", `fmt_test.T{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) |
| } |
| // The same but with a pointer. |
| out = Sprintf(tt.fmt, &s) |
| if out != "&"+tt.out { |
| t.Errorf("Sprintf(%q, &s) = %#q, want %#q", tt.fmt, out, "&"+tt.out) |
| } |
| } |
| } |
| |
| func TestSlicePrinter(t *testing.T) { |
| slice := []int{} |
| s := Sprint(slice) |
| if s != "[]" { |
| t.Errorf("empty slice printed as %q not %q", s, "[]") |
| } |
| slice = []int{1, 2, 3} |
| s = Sprint(slice) |
| if s != "[1 2 3]" { |
| t.Errorf("slice: got %q expected %q", s, "[1 2 3]") |
| } |
| s = Sprint(&slice) |
| if s != "&[1 2 3]" { |
| t.Errorf("&slice: got %q expected %q", s, "&[1 2 3]") |
| } |
| } |
| |
| // presentInMap checks 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) |
| // Pointer to map prints the same but with initial &. |
| if !strings.HasPrefix(Sprint(&m1), "&") { |
| t.Errorf("no initial & for address of map") |
| } |
| 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) |
| } |
| } |
| |
| // TestBlank checks 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) |
| } |
| } |
| |
| // TestBlankln checks 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) |
| } |
| } |
| |
| // TestFormatterPrintln checks 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) |
| } |
| } |
| } |
| |
| // Panic is 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) |
| } |
| |
| // PanicF is a type that panics in Format. |
| type PanicF struct { |
| message interface{} |
| } |
| |
| // Value receiver. |
| func (p PanicF) Format(f State, c rune) { |
| panic(p.message) |
| } |
| |
| var panictests = []struct { |
| fmt string |
| in interface{} |
| out string |
| }{ |
| // String |
| {"%s", (*Panic)(nil), "<nil>"}, // nil pointer special case |
| {"%s", Panic{io.ErrUnexpectedEOF}, "%!s(PANIC=unexpected EOF)"}, |
| {"%s", Panic{3}, "%!s(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 i, tt := range panictests { |
| s := Sprintf(tt.fmt, tt.in) |
| if s != tt.out { |
| t.Errorf("%d: %q: got %q expected %q", i, tt.fmt, s, tt.out) |
| } |
| } |
| } |
| |
| // recurCount tests that erroneous String routine doesn't cause fatal recursion. |
| var recurCount = 0 |
| |
| type Recur struct { |
| i int |
| failed *bool |
| } |
| |
| func (r *Recur) String() string { |
| if recurCount++; recurCount > 10 { |
| *r.failed = true |
| return "FAIL" |
| } |
| // This will call badVerb. Before the fix, that would cause us to recur into |
| // this routine to print %!p(value). Now we don't call the user's method |
| // during an error. |
| return Sprintf("recur@%p value: %d", r, r.i) |
| } |
| |
| func TestBadVerbRecursion(t *testing.T) { |
| failed := false |
| r := &Recur{3, &failed} |
| Sprintf("recur@%p value: %d\n", &r, r.i) |
| if failed { |
| t.Error("fail with pointer") |
| } |
| failed = false |
| r = &Recur{4, &failed} |
| Sprintf("recur@%p, value: %d\n", r, r.i) |
| if failed { |
| t.Error("fail with value") |
| } |
| } |
| |
| func TestIsSpace(t *testing.T) { |
| // This tests the internal isSpace function. |
| // IsSpace = isSpace is defined in export_test.go. |
| for i := rune(0); i <= unicode.MaxRune; i++ { |
| if IsSpace(i) != unicode.IsSpace(i) { |
| t.Errorf("isSpace(%U) = %v, want %v", i, IsSpace(i), unicode.IsSpace(i)) |
| } |
| } |
| } |
| |
| func TestNilDoesNotBecomeTyped(t *testing.T) { |
| type A struct{} |
| type B struct{} |
| var a *A = nil |
| var b B = B{} |
| got := Sprintf("%s %s %s %s %s", nil, a, nil, b, nil) // go vet should complain about this line. |
| const expect = "%!s(<nil>) %!s(*fmt_test.A=<nil>) %!s(<nil>) {} %!s(<nil>)" |
| if got != expect { |
| t.Errorf("expected:\n\t%q\ngot:\n\t%q", expect, got) |
| } |
| } |
| |
| var formatterFlagTests = []struct { |
| in string |
| val interface{} |
| out string |
| }{ |
| // scalar values with the (unused by fmt) 'a' verb. |
| {"%a", flagPrinter{}, "[%a]"}, |
| {"%-a", flagPrinter{}, "[%-a]"}, |
| {"%+a", flagPrinter{}, "[%+a]"}, |
| {"%#a", flagPrinter{}, "[%#a]"}, |
| {"% a", flagPrinter{}, "[% a]"}, |
| {"%0a", flagPrinter{}, "[%0a]"}, |
| {"%1.2a", flagPrinter{}, "[%1.2a]"}, |
| {"%-1.2a", flagPrinter{}, "[%-1.2a]"}, |
| {"%+1.2a", flagPrinter{}, "[%+1.2a]"}, |
| {"%-+1.2a", flagPrinter{}, "[%+-1.2a]"}, |
| {"%-+1.2abc", flagPrinter{}, "[%+-1.2a]bc"}, |
| {"%-1.2abc", flagPrinter{}, "[%-1.2a]bc"}, |
| |
| // composite values with the 'a' verb |
| {"%a", [1]flagPrinter{}, "[[%a]]"}, |
| {"%-a", [1]flagPrinter{}, "[[%-a]]"}, |
| {"%+a", [1]flagPrinter{}, "[[%+a]]"}, |
| {"%#a", [1]flagPrinter{}, "[[%#a]]"}, |
| {"% a", [1]flagPrinter{}, "[[% a]]"}, |
| {"%0a", [1]flagPrinter{}, "[[%0a]]"}, |
| {"%1.2a", [1]flagPrinter{}, "[[%1.2a]]"}, |
| {"%-1.2a", [1]flagPrinter{}, "[[%-1.2a]]"}, |
| {"%+1.2a", [1]flagPrinter{}, "[[%+1.2a]]"}, |
| {"%-+1.2a", [1]flagPrinter{}, "[[%+-1.2a]]"}, |
| {"%-+1.2abc", [1]flagPrinter{}, "[[%+-1.2a]]bc"}, |
| {"%-1.2abc", [1]flagPrinter{}, "[[%-1.2a]]bc"}, |
| |
| // simple values with the 'v' verb |
| {"%v", flagPrinter{}, "[%v]"}, |
| {"%-v", flagPrinter{}, "[%-v]"}, |
| {"%+v", flagPrinter{}, "[%+v]"}, |
| {"%#v", flagPrinter{}, "[%#v]"}, |
| {"% v", flagPrinter{}, "[% v]"}, |
| {"%0v", flagPrinter{}, "[%0v]"}, |
| {"%1.2v", flagPrinter{}, "[%1.2v]"}, |
| {"%-1.2v", flagPrinter{}, "[%-1.2v]"}, |
| {"%+1.2v", flagPrinter{}, "[%+1.2v]"}, |
| {"%-+1.2v", flagPrinter{}, "[%+-1.2v]"}, |
| {"%-+1.2vbc", flagPrinter{}, "[%+-1.2v]bc"}, |
| {"%-1.2vbc", flagPrinter{}, "[%-1.2v]bc"}, |
| |
| // composite values with the 'v' verb. |
| {"%v", [1]flagPrinter{}, "[[%v]]"}, |
| {"%-v", [1]flagPrinter{}, "[[%-v]]"}, |
| {"%+v", [1]flagPrinter{}, "[[%+v]]"}, |
| {"%#v", [1]flagPrinter{}, "[1]fmt_test.flagPrinter{[%#v]}"}, |
| {"% v", [1]flagPrinter{}, "[[% v]]"}, |
| {"%0v", [1]flagPrinter{}, "[[%0v]]"}, |
| {"%1.2v", [1]flagPrinter{}, "[[%1.2v]]"}, |
| {"%-1.2v", [1]flagPrinter{}, "[[%-1.2v]]"}, |
| {"%+1.2v", [1]flagPrinter{}, "[[%+1.2v]]"}, |
| {"%-+1.2v", [1]flagPrinter{}, "[[%+-1.2v]]"}, |
| {"%-+1.2vbc", [1]flagPrinter{}, "[[%+-1.2v]]bc"}, |
| {"%-1.2vbc", [1]flagPrinter{}, "[[%-1.2v]]bc"}, |
| } |
| |
| func TestFormatterFlags(t *testing.T) { |
| for _, tt := range formatterFlagTests { |
| s := Sprintf(tt.in, tt.val) |
| if s != tt.out { |
| t.Errorf("Sprintf(%q, %T) = %q, want %q", tt.in, tt.val, s, tt.out) |
| } |
| } |
| } |