| // 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" |
| "internal/race" |
| "io" |
| "math" |
| "reflect" |
| "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 any |
| i1 = "abc" |
| s := Sprintf("%s", i1) |
| if s != "abc" { |
| t.Errorf(`Sprintf("%%s", empty("abc")) = %q want %q`, s, "abc") |
| } |
| } |
| |
| var ( |
| NaN = math.NaN() |
| posInf = math.Inf(1) |
| negInf = math.Inf(-1) |
| |
| intVar = 0 |
| |
| array = [5]int{1, 2, 3, 4, 5} |
| iarray = [4]any{1, "hello", 2.5, nil} |
| slice = array[:] |
| 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 any |
| } |
| |
| // 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{'h', 'e', 'l', 'l', 'o'} |
| |
| type byteFormatter byte |
| |
| func (byteFormatter) Format(f State, _ rune) { |
| Fprint(f, "X") |
| } |
| |
| var byteFormatterSlice = []byteFormatter{'h', 'e', 'l', 'l', 'o'} |
| |
| type writeStringFormatter string |
| |
| func (sf writeStringFormatter) Format(f State, c rune) { |
| if sw, ok := f.(io.StringWriter); ok { |
| sw.WriteString("***" + string(sf) + "***") |
| } |
| } |
| |
| var fmtTests = []struct { |
| fmt string |
| val any |
| out string |
| }{ |
| {"%d", 12345, "12345"}, |
| {"%v", 12345, "12345"}, |
| {"%t", true, "true"}, |
| |
| // basic string |
| {"%s", "abc", "abc"}, |
| {"%q", "abc", `"abc"`}, |
| {"%x", "abc", "616263"}, |
| {"%x", "\xff\xf0\x0f\xff", "fff00fff"}, |
| {"%X", "\xff\xf0\x0f\xff", "FFF00FFF"}, |
| {"%x", "", ""}, |
| {"% x", "", ""}, |
| {"%#x", "", ""}, |
| {"%# x", "", ""}, |
| {"%x", "xyz", "78797a"}, |
| {"%X", "xyz", "78797A"}, |
| {"% x", "xyz", "78 79 7a"}, |
| {"% X", "xyz", "78 79 7A"}, |
| {"%#x", "xyz", "0x78797a"}, |
| {"%#X", "xyz", "0X78797A"}, |
| {"%# x", "xyz", "0x78 0x79 0x7a"}, |
| {"%# X", "xyz", "0X78 0X79 0X7A"}, |
| |
| // basic bytes |
| {"%s", []byte("abc"), "abc"}, |
| {"%s", [3]byte{'a', 'b', 'c'}, "abc"}, |
| {"%s", &[3]byte{'a', 'b', 'c'}, "&abc"}, |
| {"%q", []byte("abc"), `"abc"`}, |
| {"%x", []byte("abc"), "616263"}, |
| {"%x", []byte("\xff\xf0\x0f\xff"), "fff00fff"}, |
| {"%X", []byte("\xff\xf0\x0f\xff"), "FFF00FFF"}, |
| {"%x", []byte(""), ""}, |
| {"% x", []byte(""), ""}, |
| {"%#x", []byte(""), ""}, |
| {"%# x", []byte(""), ""}, |
| {"%x", []byte("xyz"), "78797a"}, |
| {"%X", []byte("xyz"), "78797A"}, |
| {"% x", []byte("xyz"), "78 79 7a"}, |
| {"% X", []byte("xyz"), "78 79 7A"}, |
| {"%#x", []byte("xyz"), "0x78797a"}, |
| {"%#X", []byte("xyz"), "0X78797A"}, |
| {"%# x", []byte("xyz"), "0x78 0x79 0x7a"}, |
| {"%# X", []byte("xyz"), "0X78 0X79 0X7A"}, |
| |
| // escaped strings |
| {"%q", "", `""`}, |
| {"%#q", "", "``"}, |
| {"%q", "\"", `"\""`}, |
| {"%#q", "\"", "`\"`"}, |
| {"%q", "`", `"` + "`" + `"`}, |
| {"%#q", "`", `"` + "`" + `"`}, |
| {"%q", "\n", `"\n"`}, |
| {"%#q", "\n", `"\n"`}, |
| {"%q", `\n`, `"\\n"`}, |
| {"%#q", `\n`, "`\\n`"}, |
| {"%q", "abc", `"abc"`}, |
| {"%#q", "abc", "`abc`"}, |
| {"%q", "日本語", `"日本語"`}, |
| {"%+q", "日本語", `"\u65e5\u672c\u8a9e"`}, |
| {"%#q", "日本語", "`日本語`"}, |
| {"%#+q", "日本語", "`日本語`"}, |
| {"%q", "\a\b\f\n\r\t\v\"\\", `"\a\b\f\n\r\t\v\"\\"`}, |
| {"%+q", "\a\b\f\n\r\t\v\"\\", `"\a\b\f\n\r\t\v\"\\"`}, |
| {"%#q", "\a\b\f\n\r\t\v\"\\", `"\a\b\f\n\r\t\v\"\\"`}, |
| {"%#+q", "\a\b\f\n\r\t\v\"\\", `"\a\b\f\n\r\t\v\"\\"`}, |
| {"%q", "☺", `"☺"`}, |
| {"% q", "☺", `"☺"`}, // The space modifier should have no effect. |
| {"%+q", "☺", `"\u263a"`}, |
| {"%#q", "☺", "`☺`"}, |
| {"%#+q", "☺", "`☺`"}, |
| {"%10q", "⌘", ` "⌘"`}, |
| {"%+10q", "⌘", ` "\u2318"`}, |
| {"%-10q", "⌘", `"⌘" `}, |
| {"%+-10q", "⌘", `"\u2318" `}, |
| {"%010q", "⌘", `0000000"⌘"`}, |
| {"%+010q", "⌘", `00"\u2318"`}, |
| {"%-010q", "⌘", `"⌘" `}, // 0 has no effect when - is present. |
| {"%+-010q", "⌘", `"\u2318" `}, |
| {"%#8q", "\n", ` "\n"`}, |
| {"%#+8q", "\r", ` "\r"`}, |
| {"%#-8q", "\t", "` ` "}, |
| {"%#+-8q", "\b", `"\b" `}, |
| {"%q", "abc\xffdef", `"abc\xffdef"`}, |
| {"%+q", "abc\xffdef", `"abc\xffdef"`}, |
| {"%#q", "abc\xffdef", `"abc\xffdef"`}, |
| {"%#+q", "abc\xffdef", `"abc\xffdef"`}, |
| // Runes that are not printable. |
| {"%q", "\U0010ffff", `"\U0010ffff"`}, |
| {"%+q", "\U0010ffff", `"\U0010ffff"`}, |
| {"%#q", "\U0010ffff", "``"}, |
| {"%#+q", "\U0010ffff", "``"}, |
| // Runes that are not valid. |
| {"%q", string(rune(0x110000)), `"�"`}, |
| {"%+q", string(rune(0x110000)), `"\ufffd"`}, |
| {"%#q", string(rune(0x110000)), "`�`"}, |
| {"%#+q", string(rune(0x110000)), "`�`"}, |
| |
| // characters |
| {"%c", uint('x'), "x"}, |
| {"%c", 0xe4, "ä"}, |
| {"%c", 0x672c, "本"}, |
| {"%c", '日', "日"}, |
| {"%.0c", '⌘', "⌘"}, // Specifying precision should have no effect. |
| {"%3c", '⌘', " ⌘"}, |
| {"%-3c", '⌘', "⌘ "}, |
| // Runes that are not printable. |
| {"%c", '\U00000e00', "\u0e00"}, |
| {"%c", '\U0010ffff', "\U0010ffff"}, |
| // Runes that are not valid. |
| {"%c", -1, "�"}, |
| {"%c", 0xDC80, "�"}, |
| {"%c", rune(0x110000), "�"}, |
| {"%c", int64(0xFFFFFFFFF), "�"}, |
| {"%c", uint64(0xFFFFFFFFF), "�"}, |
| |
| // escaped characters |
| {"%q", uint(0), `'\x00'`}, |
| {"%+q", uint(0), `'\x00'`}, |
| {"%q", '"', `'"'`}, |
| {"%+q", '"', `'"'`}, |
| {"%q", '\'', `'\''`}, |
| {"%+q", '\'', `'\''`}, |
| {"%q", '`', "'`'"}, |
| {"%+q", '`', "'`'"}, |
| {"%q", 'x', `'x'`}, |
| {"%+q", 'x', `'x'`}, |
| {"%q", 'ÿ', `'ÿ'`}, |
| {"%+q", 'ÿ', `'\u00ff'`}, |
| {"%q", '\n', `'\n'`}, |
| {"%+q", '\n', `'\n'`}, |
| {"%q", '☺', `'☺'`}, |
| {"%+q", '☺', `'\u263a'`}, |
| {"% q", '☺', `'☺'`}, // The space modifier should have no effect. |
| {"%.0q", '☺', `'☺'`}, // Specifying precision should have no effect. |
| {"%10q", '⌘', ` '⌘'`}, |
| {"%+10q", '⌘', ` '\u2318'`}, |
| {"%-10q", '⌘', `'⌘' `}, |
| {"%+-10q", '⌘', `'\u2318' `}, |
| {"%010q", '⌘', `0000000'⌘'`}, |
| {"%+010q", '⌘', `00'\u2318'`}, |
| {"%-010q", '⌘', `'⌘' `}, // 0 has no effect when - is present. |
| {"%+-010q", '⌘', `'\u2318' `}, |
| // Runes that are not printable. |
| {"%q", '\U00000e00', `'\u0e00'`}, |
| {"%q", '\U0010ffff', `'\U0010ffff'`}, |
| // Runes that are not valid. |
| {"%q", int32(-1), `'�'`}, |
| {"%q", 0xDC80, `'�'`}, |
| {"%q", rune(0x110000), `'�'`}, |
| {"%q", int64(0xFFFFFFFFF), `'�'`}, |
| {"%q", uint64(0xFFFFFFFFF), `'�'`}, |
| |
| // width |
| {"%5s", "abc", " abc"}, |
| {"%5s", []byte("abc"), " abc"}, |
| {"%2s", "\u263a", " ☺"}, |
| {"%2s", []byte("\u263a"), " ☺"}, |
| {"%-5s", "abc", "abc "}, |
| {"%-5s", []byte("abc"), "abc "}, |
| {"%05s", "abc", "00abc"}, |
| {"%05s", []byte("abc"), "00abc"}, |
| {"%5s", "abcdefghijklmnopqrstuvwxyz", "abcdefghijklmnopqrstuvwxyz"}, |
| {"%5s", []byte("abcdefghijklmnopqrstuvwxyz"), "abcdefghijklmnopqrstuvwxyz"}, |
| {"%.5s", "abcdefghijklmnopqrstuvwxyz", "abcde"}, |
| {"%.5s", []byte("abcdefghijklmnopqrstuvwxyz"), "abcde"}, |
| {"%.0s", "日本語日本語", ""}, |
| {"%.0s", []byte("日本語日本語"), ""}, |
| {"%.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"}, |
| {"%.10s", "日本語日本語", "日本語日本語"}, |
| {"%.10s", []byte("日本語日本語"), "日本語日本語"}, |
| {"%08q", "abc", `000"abc"`}, |
| {"%08q", []byte("abc"), `000"abc"`}, |
| {"%-8q", "abc", `"abc" `}, |
| {"%-8q", []byte("abc"), `"abc" `}, |
| {"%.5q", "abcdefghijklmnopqrstuvwxyz", `"abcde"`}, |
| {"%.5q", []byte("abcdefghijklmnopqrstuvwxyz"), `"abcde"`}, |
| {"%.5x", "abcdefghijklmnopqrstuvwxyz", "6162636465"}, |
| {"%.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"`}, |
| {"%10.1q", []byte("日本語日本語"), ` "日"`}, |
| {"%10v", nil, " <nil>"}, |
| {"%-10v", nil, "<nil> "}, |
| |
| // integers |
| {"%d", uint(12345), "12345"}, |
| {"%d", int(-12345), "-12345"}, |
| {"%d", ^uint8(0), "255"}, |
| {"%d", ^uint16(0), "65535"}, |
| {"%d", ^uint32(0), "4294967295"}, |
| {"%d", ^uint64(0), "18446744073709551615"}, |
| {"%d", int8(-1 << 7), "-128"}, |
| {"%d", int16(-1 << 15), "-32768"}, |
| {"%d", int32(-1 << 31), "-2147483648"}, |
| {"%d", int64(-1 << 63), "-9223372036854775808"}, |
| {"%.d", 0, ""}, |
| {"%.0d", 0, ""}, |
| {"%6.0d", 0, " "}, |
| {"%06.0d", 0, " "}, |
| {"% d", 12345, " 12345"}, |
| {"%+d", 12345, "+12345"}, |
| {"%+d", -12345, "-12345"}, |
| {"%b", 7, "111"}, |
| {"%b", -6, "-110"}, |
| {"%#b", 7, "0b111"}, |
| {"%#b", -6, "-0b110"}, |
| {"%b", ^uint32(0), "11111111111111111111111111111111"}, |
| {"%b", ^uint64(0), "1111111111111111111111111111111111111111111111111111111111111111"}, |
| {"%b", int64(-1 << 63), zeroFill("-1", 63, "")}, |
| {"%o", 01234, "1234"}, |
| {"%o", -01234, "-1234"}, |
| {"%#o", 01234, "01234"}, |
| {"%#o", -01234, "-01234"}, |
| {"%O", 01234, "0o1234"}, |
| {"%O", -01234, "-0o1234"}, |
| {"%o", ^uint32(0), "37777777777"}, |
| {"%o", ^uint64(0), "1777777777777777777777"}, |
| {"%#X", 0, "0X0"}, |
| {"%x", 0x12abcdef, "12abcdef"}, |
| {"%X", 0x12abcdef, "12ABCDEF"}, |
| {"%x", ^uint32(0), "ffffffff"}, |
| {"%X", ^uint64(0), "FFFFFFFFFFFFFFFF"}, |
| {"%.20b", 7, "00000000000000000111"}, |
| {"%10d", 12345, " 12345"}, |
| {"%10d", -12345, " -12345"}, |
| {"%+10d", 12345, " +12345"}, |
| {"%010d", 12345, "0000012345"}, |
| {"%010d", -12345, "-000012345"}, |
| {"%20.8d", 1234, " 00001234"}, |
| {"%20.8d", -1234, " -00001234"}, |
| {"%020.8d", 1234, " 00001234"}, |
| {"%020.8d", -1234, " -00001234"}, |
| {"%-20.8d", 1234, "00001234 "}, |
| {"%-20.8d", -1234, "-00001234 "}, |
| {"%-#20.8x", 0x1234abc, "0x01234abc "}, |
| {"%-#20.8X", 0x1234abc, "0X01234ABC "}, |
| {"%-#20.8o", 01234, "00001234 "}, |
| |
| // Test correct f.intbuf overflow checks. |
| {"%068d", 1, zeroFill("", 68, "1")}, |
| {"%068d", -1, zeroFill("-", 67, "1")}, |
| {"%#.68x", 42, zeroFill("0x", 68, "2a")}, |
| {"%.68d", -42, zeroFill("-", 68, "42")}, |
| {"%+.68d", 42, zeroFill("+", 68, "42")}, |
| {"% .68d", 42, zeroFill(" ", 68, "42")}, |
| {"% +.68d", 42, zeroFill("+", 68, "42")}, |
| |
| // unicode format |
| {"%U", 0, "U+0000"}, |
| {"%U", -1, "U+FFFFFFFFFFFFFFFF"}, |
| {"%U", '\n', `U+000A`}, |
| {"%#U", '\n', `U+000A`}, |
| {"%+U", 'x', `U+0078`}, // Plus flag should have no effect. |
| {"%# U", 'x', `U+0078 'x'`}, // Space flag should have no effect. |
| {"%#.2U", 'x', `U+0078 'x'`}, // Precisions below 4 should print 4 digits. |
| {"%U", '\u263a', `U+263A`}, |
| {"%#U", '\u263a', `U+263A '☺'`}, |
| {"%U", '\U0001D6C2', `U+1D6C2`}, |
| {"%#U", '\U0001D6C2', `U+1D6C2 '𝛂'`}, |
| {"%#14.6U", '⌘', " U+002318 '⌘'"}, |
| {"%#-14.6U", '⌘', "U+002318 '⌘' "}, |
| {"%#014.6U", '⌘', " U+002318 '⌘'"}, |
| {"%#-014.6U", '⌘', "U+002318 '⌘' "}, |
| {"%.68U", uint(42), zeroFill("U+", 68, "2A")}, |
| {"%#.68U", '日', zeroFill("U+", 68, "65E5") + " '日'"}, |
| |
| // floats |
| {"%+.3e", 0.0, "+0.000e+00"}, |
| {"%+.3e", 1.0, "+1.000e+00"}, |
| {"%+.3x", 0.0, "+0x0.000p+00"}, |
| {"%+.3x", 1.0, "+0x1.000p+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"}, |
| {"%-07.2f", 1.0, "1.00 "}, |
| {"%-07.2f", -1.0, "-1.00 "}, |
| {"%+-07.2f", 1.0, "+1.00 "}, |
| {"%+-07.2f", -1.0, "-1.00 "}, |
| {"%-+07.2f", 1.0, "+1.00 "}, |
| {"%-+07.2f", -1.0, "-1.00 "}, |
| {"%+10.2f", +1.0, " +1.00"}, |
| {"%+10.2f", -1.0, " -1.00"}, |
| {"% .3E", -1.0, "-1.000E+00"}, |
| {"% .3e", 1.0, " 1.000e+00"}, |
| {"% .3X", -1.0, "-0X1.000P+00"}, |
| {"% .3x", 1.0, " 0x1.000p+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"}, |
| // Test sharp flag used with floats. |
| {"%#g", 1e-323, "1.00000e-323"}, |
| {"%#g", -1.0, "-1.00000"}, |
| {"%#g", 1.1, "1.10000"}, |
| {"%#g", 123456.0, "123456."}, |
| {"%#g", 1234567.0, "1.234567e+06"}, |
| {"%#g", 1230000.0, "1.23000e+06"}, |
| {"%#g", 1000000.0, "1.00000e+06"}, |
| {"%#.0f", 1.0, "1."}, |
| {"%#.0e", 1.0, "1.e+00"}, |
| {"%#.0x", 1.0, "0x1.p+00"}, |
| {"%#.0g", 1.0, "1."}, |
| {"%#.0g", 1100000.0, "1.e+06"}, |
| {"%#.4f", 1.0, "1.0000"}, |
| {"%#.4e", 1.0, "1.0000e+00"}, |
| {"%#.4x", 1.0, "0x1.0000p+00"}, |
| {"%#.4g", 1.0, "1.000"}, |
| {"%#.4g", 100000.0, "1.000e+05"}, |
| {"%#.4g", 1.234, "1.234"}, |
| {"%#.4g", 0.1234, "0.1234"}, |
| {"%#.4g", 1.23, "1.230"}, |
| {"%#.4g", 0.123, "0.1230"}, |
| {"%#.4g", 1.2, "1.200"}, |
| {"%#.4g", 0.12, "0.1200"}, |
| {"%#.4g", 10.2, "10.20"}, |
| {"%#.4g", 0.0, "0.000"}, |
| {"%#.4g", 0.012, "0.01200"}, |
| {"%#.0f", 123.0, "123."}, |
| {"%#.0e", 123.0, "1.e+02"}, |
| {"%#.0x", 123.0, "0x1.p+07"}, |
| {"%#.0g", 123.0, "1.e+02"}, |
| {"%#.4f", 123.0, "123.0000"}, |
| {"%#.4e", 123.0, "1.2300e+02"}, |
| {"%#.4x", 123.0, "0x1.ec00p+06"}, |
| {"%#.4g", 123.0, "123.0"}, |
| {"%#.4g", 123000.0, "1.230e+05"}, |
| {"%#9.4g", 1.0, " 1.000"}, |
| // The sharp flag has no effect for binary float format. |
| {"%#b", 1.0, "4503599627370496p-52"}, |
| // Precision has no effect for binary float format. |
| {"%.4b", float32(1.0), "8388608p-23"}, |
| {"%.4b", -1.0, "-4503599627370496p-52"}, |
| // Test correct f.intbuf boundary checks. |
| {"%.68f", 1.0, zeroFill("1.", 68, "")}, |
| {"%.68f", -1.0, zeroFill("-1.", 68, "")}, |
| // float infinites and NaNs |
| {"%f", posInf, "+Inf"}, |
| {"%.1f", negInf, "-Inf"}, |
| {"% f", NaN, " NaN"}, |
| {"%20f", posInf, " +Inf"}, |
| {"% 20F", posInf, " Inf"}, |
| {"% 20e", negInf, " -Inf"}, |
| {"% 20x", negInf, " -Inf"}, |
| {"%+20E", negInf, " -Inf"}, |
| {"%+20X", negInf, " -Inf"}, |
| {"% +20g", negInf, " -Inf"}, |
| {"%+-20G", posInf, "+Inf "}, |
| {"%20e", NaN, " NaN"}, |
| {"%20x", NaN, " NaN"}, |
| {"% +20E", NaN, " +NaN"}, |
| {"% +20X", NaN, " +NaN"}, |
| {"% -20g", NaN, " NaN "}, |
| {"%+-20G", NaN, "+NaN "}, |
| // Zero padding does not apply to infinities and NaN. |
| {"%+020e", posInf, " +Inf"}, |
| {"%+020x", posInf, " +Inf"}, |
| {"%-020f", negInf, "-Inf "}, |
| {"%-020E", NaN, "NaN "}, |
| {"%-020X", NaN, "NaN "}, |
| |
| // complex values |
| {"%.f", 0i, "(0+0i)"}, |
| {"% .f", 0i, "( 0+0i)"}, |
| {"%+.f", 0i, "(+0+0i)"}, |
| {"% +.f", 0i, "(+0+0i)"}, |
| {"%+.3e", 0i, "(+0.000e+00+0.000e+00i)"}, |
| {"%+.3x", 0i, "(+0x0.000p+00+0x0.000p+00i)"}, |
| {"%+.3f", 0i, "(+0.000+0.000i)"}, |
| {"%+.3g", 0i, "(+0+0i)"}, |
| {"%+.3e", 1 + 2i, "(+1.000e+00+2.000e+00i)"}, |
| {"%+.3x", 1 + 2i, "(+0x1.000p+00+0x1.000p+01i)"}, |
| {"%+.3f", 1 + 2i, "(+1.000+2.000i)"}, |
| {"%+.3g", 1 + 2i, "(+1+2i)"}, |
| {"%.3e", 0i, "(0.000e+00+0.000e+00i)"}, |
| {"%.3x", 0i, "(0x0.000p+00+0x0.000p+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)"}, |
| {"%.3x", 1 + 2i, "(0x1.000p+00+0x1.000p+01i)"}, |
| {"%.3f", 1 + 2i, "(1.000+2.000i)"}, |
| {"%.3g", 1 + 2i, "(1+2i)"}, |
| {"%.3e", -1 - 2i, "(-1.000e+00-2.000e+00i)"}, |
| {"%.3x", -1 - 2i, "(-0x1.000p+00-0x1.000p+01i)"}, |
| {"%.3f", -1 - 2i, "(-1.000-2.000i)"}, |
| {"%.3g", -1 - 2i, "(-1-2i)"}, |
| {"% .3E", -1 - 2i, "(-1.000E+00-2.000E+00i)"}, |
| {"% .3X", -1 - 2i, "(-0X1.000P+00-0X1.000P+01i)"}, |
| {"%+.3g", 1 + 2i, "(+1+2i)"}, |
| {"%+.3g", complex64(1 + 2i), "(+1+2i)"}, |
| {"%#g", 1 + 2i, "(1.00000+2.00000i)"}, |
| {"%#g", 123456 + 789012i, "(123456.+789012.i)"}, |
| {"%#g", 1e-10i, "(0.00000+1.00000e-10i)"}, |
| {"%#g", -1e10 - 1.11e100i, "(-1.00000e+10-1.11000e+100i)"}, |
| {"%#.0f", 1.23 + 1.0i, "(1.+1.i)"}, |
| {"%#.0e", 1.23 + 1.0i, "(1.e+00+1.e+00i)"}, |
| {"%#.0x", 1.23 + 1.0i, "(0x1.p+00+0x1.p+00i)"}, |
| {"%#.0g", 1.23 + 1.0i, "(1.+1.i)"}, |
| {"%#.0g", 0 + 100000i, "(0.+1.e+05i)"}, |
| {"%#.0g", 1230000 + 0i, "(1.e+06+0.i)"}, |
| {"%#.4f", 1 + 1.23i, "(1.0000+1.2300i)"}, |
| {"%#.4e", 123 + 1i, "(1.2300e+02+1.0000e+00i)"}, |
| {"%#.4x", 123 + 1i, "(0x1.ec00p+06+0x1.0000p+00i)"}, |
| {"%#.4g", 123 + 1.23i, "(123.0+1.230i)"}, |
| {"%#12.5g", 0 + 100000i, "( 0.0000 +1.0000e+05i)"}, |
| {"%#12.5g", 1230000 - 0i, "( 1.2300e+06 +0.0000i)"}, |
| {"%b", 1 + 2i, "(4503599627370496p-52+4503599627370496p-51i)"}, |
| {"%b", complex64(1 + 2i), "(8388608p-23+8388608p-22i)"}, |
| // The sharp flag has no effect for binary complex format. |
| {"%#b", 1 + 2i, "(4503599627370496p-52+4503599627370496p-51i)"}, |
| // Precision has no effect for binary complex format. |
| {"%.4b", 1 + 2i, "(4503599627370496p-52+4503599627370496p-51i)"}, |
| {"%.4b", complex64(1 + 2i), "(8388608p-23+8388608p-22i)"}, |
| // complex infinites and NaNs |
| {"%f", complex(posInf, posInf), "(+Inf+Infi)"}, |
| {"%f", complex(negInf, negInf), "(-Inf-Infi)"}, |
| {"%f", complex(NaN, NaN), "(NaN+NaNi)"}, |
| {"%.1f", complex(posInf, posInf), "(+Inf+Infi)"}, |
| {"% f", complex(posInf, posInf), "( Inf+Infi)"}, |
| {"% f", complex(negInf, negInf), "(-Inf-Infi)"}, |
| {"% f", complex(NaN, NaN), "( NaN+NaNi)"}, |
| {"%8e", complex(posInf, posInf), "( +Inf +Infi)"}, |
| {"%8x", complex(posInf, posInf), "( +Inf +Infi)"}, |
| {"% 8E", complex(posInf, posInf), "( Inf +Infi)"}, |
| {"% 8X", complex(posInf, posInf), "( Inf +Infi)"}, |
| {"%+8f", complex(negInf, negInf), "( -Inf -Infi)"}, |
| {"% +8g", complex(negInf, negInf), "( -Inf -Infi)"}, |
| {"% -8G", complex(NaN, NaN), "( NaN +NaN i)"}, |
| {"%+-8b", complex(NaN, NaN), "(+NaN +NaN i)"}, |
| // Zero padding does not apply to infinities and NaN. |
| {"%08f", complex(posInf, posInf), "( +Inf +Infi)"}, |
| {"%-08g", complex(negInf, negInf), "(-Inf -Inf i)"}, |
| {"%-08G", complex(NaN, NaN), "(NaN +NaN i)"}, |
| |
| // old test/fmt_test.go |
| {"%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"}, |
| {"%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"}, |
| |
| // 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]"}, |
| |
| // byte arrays and slices with %b,%c,%d,%o,%U and %v |
| {"%b", [3]byte{65, 66, 67}, "[1000001 1000010 1000011]"}, |
| {"%c", [3]byte{65, 66, 67}, "[A B C]"}, |
| {"%d", [3]byte{65, 66, 67}, "[65 66 67]"}, |
| {"%o", [3]byte{65, 66, 67}, "[101 102 103]"}, |
| {"%U", [3]byte{65, 66, 67}, "[U+0041 U+0042 U+0043]"}, |
| {"%v", [3]byte{65, 66, 67}, "[65 66 67]"}, |
| {"%v", [1]byte{123}, "[123]"}, |
| {"%012v", []byte{}, "[]"}, |
| {"%#012v", []byte{}, "[]byte{}"}, |
| {"%6v", []byte{1, 11, 111}, "[ 1 11 111]"}, |
| {"%06v", []byte{1, 11, 111}, "[000001 000011 000111]"}, |
| {"%-6v", []byte{1, 11, 111}, "[1 11 111 ]"}, |
| {"%-06v", []byte{1, 11, 111}, "[1 11 111 ]"}, |
| {"%#v", []byte{1, 11, 111}, "[]byte{0x1, 0xb, 0x6f}"}, |
| {"%#6v", []byte{1, 11, 111}, "[]byte{ 0x1, 0xb, 0x6f}"}, |
| {"%#06v", []byte{1, 11, 111}, "[]byte{0x000001, 0x00000b, 0x00006f}"}, |
| {"%#-6v", []byte{1, 11, 111}, "[]byte{0x1 , 0xb , 0x6f }"}, |
| {"%#-06v", []byte{1, 11, 111}, "[]byte{0x1 , 0xb , 0x6f }"}, |
| // f.space should and f.plus should not have an effect with %v. |
| {"% v", []byte{1, 11, 111}, "[ 1 11 111]"}, |
| {"%+v", [3]byte{1, 11, 111}, "[1 11 111]"}, |
| {"%# -6v", []byte{1, 11, 111}, "[]byte{ 0x1 , 0xb , 0x6f }"}, |
| {"%#+-6v", [3]byte{1, 11, 111}, "[3]uint8{0x1 , 0xb , 0x6f }"}, |
| // f.space and f.plus should have an effect with %d. |
| {"% d", []byte{1, 11, 111}, "[ 1 11 111]"}, |
| {"%+d", [3]byte{1, 11, 111}, "[+1 +11 +111]"}, |
| {"%# -6d", []byte{1, 11, 111}, "[ 1 11 111 ]"}, |
| {"%#+-6d", [3]byte{1, 11, 111}, "[+1 +11 +111 ]"}, |
| |
| // floates with %v |
| {"%v", 1.2345678, "1.2345678"}, |
| {"%v", float32(1.2345678), "1.2345678"}, |
| |
| // complexes with %v |
| {"%v", 1 + 2i, "(1+2i)"}, |
| {"%v", complex64(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`}, |
| // Stringer applies only to string formats. |
| {"%d", I(23), `23`}, |
| // Stringer applies to the extracted value. |
| {"%s", reflect.ValueOf(I(23)), `<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", new(byte), "(*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", []int32(nil), "[]int32(nil)"}, |
| {"%#v", 1.2345678, "1.2345678"}, |
| {"%#v", float32(1.2345678), "1.2345678"}, |
| |
| // Whole number floats are printed without decimals. See Issue 27634. |
| {"%#v", 1.0, "1"}, |
| {"%#v", 1000000.0, "1e+06"}, |
| {"%#v", float32(1.0), "1"}, |
| {"%#v", float32(1000000.0), "1e+06"}, |
| |
| // Only print []byte and []uint8 as type []byte if they appear at the top level. |
| {"%#v", []byte(nil), "[]byte(nil)"}, |
| {"%#v", []uint8(nil), "[]byte(nil)"}, |
| {"%#v", []byte{}, "[]byte{}"}, |
| {"%#v", []uint8{}, "[]byte{}"}, |
| {"%#v", reflect.ValueOf([]byte{}), "[]uint8{}"}, |
| {"%#v", reflect.ValueOf([]uint8{}), "[]uint8{}"}, |
| {"%#v", &[]byte{}, "&[]uint8{}"}, |
| {"%#v", &[]byte{}, "&[]uint8{}"}, |
| {"%#v", [3]byte{}, "[3]uint8{0x0, 0x0, 0x0}"}, |
| {"%#v", [3]uint8{}, "[3]uint8{0x0, 0x0, 0x0}"}, |
| |
| // 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"]`}, |
| {"% 02x", []byte{1}, "01"}, |
| {"% 02x", []byte{1, 2, 3}, "01 02 03"}, |
| |
| // Padding with byte slices. |
| {"%2x", []byte{}, " "}, |
| {"%#2x", []byte{}, " "}, |
| {"% 02x", []byte{}, "00"}, |
| {"%# 02x", []byte{}, "00"}, |
| {"%-2x", []byte{}, " "}, |
| {"%-02x", []byte{}, " "}, |
| {"%8x", []byte{0xab}, " ab"}, |
| {"% 8x", []byte{0xab}, " ab"}, |
| {"%#8x", []byte{0xab}, " 0xab"}, |
| {"%# 8x", []byte{0xab}, " 0xab"}, |
| {"%08x", []byte{0xab}, "000000ab"}, |
| {"% 08x", []byte{0xab}, "000000ab"}, |
| {"%#08x", []byte{0xab}, "00000xab"}, |
| {"%# 08x", []byte{0xab}, "00000xab"}, |
| {"%10x", []byte{0xab, 0xcd}, " abcd"}, |
| {"% 10x", []byte{0xab, 0xcd}, " ab cd"}, |
| {"%#10x", []byte{0xab, 0xcd}, " 0xabcd"}, |
| {"%# 10x", []byte{0xab, 0xcd}, " 0xab 0xcd"}, |
| {"%010x", []byte{0xab, 0xcd}, "000000abcd"}, |
| {"% 010x", []byte{0xab, 0xcd}, "00000ab cd"}, |
| {"%#010x", []byte{0xab, 0xcd}, "00000xabcd"}, |
| {"%# 010x", []byte{0xab, 0xcd}, "00xab 0xcd"}, |
| {"%-10X", []byte{0xab}, "AB "}, |
| {"% -010X", []byte{0xab}, "AB "}, |
| {"%#-10X", []byte{0xab, 0xcd}, "0XABCD "}, |
| {"%# -010X", []byte{0xab, 0xcd}, "0XAB 0XCD "}, |
| // Same for strings |
| {"%2x", "", " "}, |
| {"%#2x", "", " "}, |
| {"% 02x", "", "00"}, |
| {"%# 02x", "", "00"}, |
| {"%-2x", "", " "}, |
| {"%-02x", "", " "}, |
| {"%8x", "\xab", " ab"}, |
| {"% 8x", "\xab", " ab"}, |
| {"%#8x", "\xab", " 0xab"}, |
| {"%# 8x", "\xab", " 0xab"}, |
| {"%08x", "\xab", "000000ab"}, |
| {"% 08x", "\xab", "000000ab"}, |
| {"%#08x", "\xab", "00000xab"}, |
| {"%# 08x", "\xab", "00000xab"}, |
| {"%10x", "\xab\xcd", " abcd"}, |
| {"% 10x", "\xab\xcd", " ab cd"}, |
| {"%#10x", "\xab\xcd", " 0xabcd"}, |
| {"%# 10x", "\xab\xcd", " 0xab 0xcd"}, |
| {"%010x", "\xab\xcd", "000000abcd"}, |
| {"% 010x", "\xab\xcd", "00000ab cd"}, |
| {"%#010x", "\xab\xcd", "00000xabcd"}, |
| {"%# 010x", "\xab\xcd", "00xab 0xcd"}, |
| {"%-10X", "\xab", "AB "}, |
| {"% -010X", "\xab", "AB "}, |
| {"%#-10X", "\xab\xcd", "0XABCD "}, |
| {"%# -010X", "\xab\xcd", "0XAB 0XCD "}, |
| |
| // 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{'h', 'e', 'l', 'l', 'o'}, "68656c6c6f"}, |
| {"%X", []renamedUint8{'h', 'e', 'l', 'l', 'o'}, "68656C6C6F"}, |
| {"%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", byte(0), "uint8"}, |
| {"%T", reflect.ValueOf(nil), "reflect.Value"}, |
| {"%T", (4 - 3i), "complex128"}, |
| {"%T", renamedComplex128(4 - 3i), "fmt_test.renamedComplex128"}, |
| {"%T", intVar, "int"}, |
| {"%6T", &intVar, " *int"}, |
| {"%10T", nil, " <nil>"}, |
| {"%-10T", nil, "<nil> "}, |
| |
| // %p with pointers |
| {"%p", (*int)(nil), "0x0"}, |
| {"%#p", (*int)(nil), "0"}, |
| {"%p", &intVar, "0xPTR"}, |
| {"%#p", &intVar, "PTR"}, |
| {"%p", &array, "0xPTR"}, |
| {"%p", &slice, "0xPTR"}, |
| {"%8.2p", (*int)(nil), " 0x00"}, |
| {"%-20.16p", &intVar, "0xPTR "}, |
| // %p on non-pointers |
| {"%p", make(chan int), "0xPTR"}, |
| {"%p", make(map[int]int), "0xPTR"}, |
| {"%p", func() {}, "0xPTR"}, |
| {"%p", 27, "%!p(int=27)"}, // not a pointer at all |
| {"%p", nil, "%!p(<nil>)"}, // nil on its own has no type ... |
| {"%#p", nil, "%!p(<nil>)"}, // ... and hence is not a pointer type. |
| // pointers with specified base |
| {"%b", &intVar, "PTR_b"}, |
| {"%d", &intVar, "PTR_d"}, |
| {"%o", &intVar, "PTR_o"}, |
| {"%x", &intVar, "PTR_x"}, |
| {"%X", &intVar, "PTR_X"}, |
| // %v on pointers |
| {"%v", nil, "<nil>"}, |
| {"%#v", nil, "<nil>"}, |
| {"%v", (*int)(nil), "<nil>"}, |
| {"%#v", (*int)(nil), "(*int)(nil)"}, |
| {"%v", &intVar, "0xPTR"}, |
| {"%#v", &intVar, "(*int)(0xPTR)"}, |
| {"%8.2v", (*int)(nil), " <nil>"}, |
| {"%-20.16v", &intVar, "0xPTR "}, |
| // string method on pointer |
| {"%s", &pValue, "String(p)"}, // String method... |
| {"%p", &pValue, "0xPTR"}, // ... is not called with %p. |
| |
| // %d on Stringer should give integer if possible |
| {"%s", time.Time{}.Month(), "January"}, |
| {"%d", time.Time{}.Month(), "1"}, |
| |
| // erroneous things |
| {"", nil, "%!(EXTRA <nil>)"}, |
| {"", 2, "%!(EXTRA int=2)"}, |
| {"no args", "hello", "no args%!(EXTRA string=hello)"}, |
| {"%s %", "hello", "hello %!(NOVERB)"}, |
| {"%s %.2", "hello", "hello %!(NOVERB)"}, |
| {"%017091901790959340919092959340919017929593813360", 0, "%!(NOVERB)%!(EXTRA int=0)"}, |
| {"%184467440737095516170v", 0, "%!(NOVERB)%!(EXTRA int=0)"}, |
| // Extra argument errors should format without flags set. |
| {"%010.2", "12345", "%!(NOVERB)%!(EXTRA string=12345)"}, |
| |
| // Test that maps with non-reflexive keys print all keys and values. |
| {"%v", map[float64]int{NaN: 1, NaN: 1}, "map[NaN:1 NaN:1]"}, |
| |
| // Comparison of padding rules with C printf. |
| /* |
| C program: |
| #include <stdio.h> |
| |
| char *format[] = { |
| "[%.2f]", |
| "[% .2f]", |
| "[%+.2f]", |
| "[%7.2f]", |
| "[% 7.2f]", |
| "[%+7.2f]", |
| "[% +7.2f]", |
| "[%07.2f]", |
| "[% 07.2f]", |
| "[%+07.2f]", |
| "[% +07.2f]" |
| }; |
| |
| int main(void) { |
| int i; |
| for(i = 0; i < 11; 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] |
| [% +7.2f]: [ +1.00] [ -1.00] |
| [%07.2f]: [0001.00] [-001.00] |
| [% 07.2f]: [ 001.00] [-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"}, |
| {"% +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"}, |
| {"% +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)"}, |
| |
| // Use spaces instead of zero if padding to the right. |
| {"%0-5s", "abc", "abc "}, |
| {"%-05.1f", 1.0, "1.0 "}, |
| |
| // float and complex formatting should not change the padding width |
| // for other elements. See issue 14642. |
| {"%06v", []any{+10.0, 10}, "[000010 000010]"}, |
| {"%06v", []any{-10.0, 10}, "[-00010 000010]"}, |
| {"%06v", []any{+10.0 + 10i, 10}, "[(000010+00010i) 000010]"}, |
| {"%06v", []any{-10.0 + 10i, 10}, "[(-00010+00010i) 000010]"}, |
| |
| // integer formatting should not alter padding for other elements. |
| {"%03.6v", []any{1, 2.0, "x"}, "[000001 002 00x]"}, |
| {"%03.0v", []any{0, 2.0, "x"}, "[ 002 000]"}, |
| |
| // 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)"}, |
| |
| // 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 X]"}, |
| {"%s", byteStringerSlice, "hello"}, |
| {"%q", byteStringerSlice, "\"hello\""}, |
| {"%x", byteStringerSlice, "68656c6c6f"}, |
| {"%X", byteStringerSlice, "68656C6C6F"}, |
| {"%#v", byteStringerSlice, "[]fmt_test.byteStringer{0x68, 0x65, 0x6c, 0x6c, 0x6f}"}, |
| |
| // And the same for Formatter. |
| {"%v", byteFormatterSlice, "[X X X X X]"}, |
| {"%s", byteFormatterSlice, "hello"}, |
| {"%q", byteFormatterSlice, "\"hello\""}, |
| {"%x", byteFormatterSlice, "68656c6c6f"}, |
| {"%X", byteFormatterSlice, "68656C6C6F"}, |
| // This next case seems wrong, but the docs say the Formatter wins here. |
| {"%#v", byteFormatterSlice, "[]fmt_test.byteFormatter{X, X, X, X, X}"}, |
| |
| // pp.WriteString |
| {"%s", writeStringFormatter(""), "******"}, |
| {"%s", writeStringFormatter("xyz"), "***xyz***"}, |
| {"%s", writeStringFormatter("⌘/⌘"), "***⌘/⌘***"}, |
| |
| // reflect.Value handled specially in Go 1.5, making it possible to |
| // see inside non-exported fields (which cannot be accessed with Interface()). |
| // Issue 8965. |
| {"%v", reflect.ValueOf(A{}).Field(0).String(), "<int Value>"}, // Equivalent to the old way. |
| {"%v", reflect.ValueOf(A{}).Field(0), "0"}, // Sees inside the field. |
| |
| // verbs apply to the extracted value too. |
| {"%s", reflect.ValueOf("hello"), "hello"}, |
| {"%q", reflect.ValueOf("hello"), `"hello"`}, |
| {"%#04x", reflect.ValueOf(256), "0x0100"}, |
| |
| // invalid reflect.Value doesn't crash. |
| {"%v", reflect.Value{}, "<invalid reflect.Value>"}, |
| {"%v", &reflect.Value{}, "<invalid Value>"}, |
| {"%v", SI{reflect.Value{}}, "{<invalid Value>}"}, |
| |
| // Tests to check that not supported verbs generate an error string. |
| {"%☠", nil, "%!☠(<nil>)"}, |
| {"%☠", any(nil), "%!☠(<nil>)"}, |
| {"%☠", int(0), "%!☠(int=0)"}, |
| {"%☠", uint(0), "%!☠(uint=0)"}, |
| {"%☠", []byte{0, 1}, "[%!☠(uint8=0) %!☠(uint8=1)]"}, |
| {"%☠", []uint8{0, 1}, "[%!☠(uint8=0) %!☠(uint8=1)]"}, |
| {"%☠", [1]byte{0}, "[%!☠(uint8=0)]"}, |
| {"%☠", [1]uint8{0}, "[%!☠(uint8=0)]"}, |
| {"%☠", "hello", "%!☠(string=hello)"}, |
| {"%☠", 1.2345678, "%!☠(float64=1.2345678)"}, |
| {"%☠", float32(1.2345678), "%!☠(float32=1.2345678)"}, |
| {"%☠", 1.2345678 + 1.2345678i, "%!☠(complex128=(1.2345678+1.2345678i))"}, |
| {"%☠", complex64(1.2345678 + 1.2345678i), "%!☠(complex64=(1.2345678+1.2345678i))"}, |
| {"%☠", &intVar, "%!☠(*int=0xPTR)"}, |
| {"%☠", make(chan int), "%!☠(chan int=0xPTR)"}, |
| {"%☠", func() {}, "%!☠(func()=0xPTR)"}, |
| {"%☠", reflect.ValueOf(renamedInt(0)), "%!☠(fmt_test.renamedInt=0)"}, |
| {"%☠", SI{renamedInt(0)}, "{%!☠(fmt_test.renamedInt=0)}"}, |
| {"%☠", &[]any{I(1), G(2)}, "&[%!☠(fmt_test.I=1) %!☠(fmt_test.G=2)]"}, |
| {"%☠", SI{&[]any{I(1), G(2)}}, "{%!☠(*[]interface {}=&[1 2])}"}, |
| {"%☠", reflect.Value{}, "<invalid reflect.Value>"}, |
| {"%☠", map[float64]int{NaN: 1}, "map[%!☠(float64=NaN):%!☠(int=1)]"}, |
| } |
| |
| // 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) |
| i := strings.Index(tt.out, "PTR") |
| if i >= 0 && i < len(s) { |
| var pattern, chars string |
| switch { |
| case strings.HasPrefix(tt.out[i:], "PTR_b"): |
| pattern = "PTR_b" |
| chars = "01" |
| case strings.HasPrefix(tt.out[i:], "PTR_o"): |
| pattern = "PTR_o" |
| chars = "01234567" |
| case strings.HasPrefix(tt.out[i:], "PTR_d"): |
| pattern = "PTR_d" |
| chars = "0123456789" |
| case strings.HasPrefix(tt.out[i:], "PTR_x"): |
| pattern = "PTR_x" |
| chars = "0123456789abcdef" |
| case strings.HasPrefix(tt.out[i:], "PTR_X"): |
| pattern = "PTR_X" |
| chars = "0123456789ABCDEF" |
| default: |
| pattern = "PTR" |
| chars = "0123456789abcdefABCDEF" |
| } |
| p := s[:i] + pattern |
| for j := i; j < len(s); j++ { |
| if !strings.ContainsRune(chars, rune(s[j])) { |
| p += s[j:] |
| break |
| } |
| } |
| s = p |
| } |
| 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, posInf, negInf, 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 []any // 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. |
| {"%.[]", SE{}, "%!](BADINDEX)"}, // Issue 10675 |
| {"%.-3d", SE{42}, "%!-(int=42)3d"}, // TODO: Should this set return better error messages? |
| {"%2147483648d", SE{42}, "%!(NOVERB)%!(EXTRA int=42)"}, |
| {"%-2147483648d", SE{42}, "%!(NOVERB)%!(EXTRA int=42)"}, |
| {"%.2147483648d", SE{42}, "%!(NOVERB)%!(EXTRA int=42)"}, |
| } |
| |
| 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 BenchmarkSprintfPadding(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%16f", 1.0) |
| } |
| }) |
| } |
| |
| 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 BenchmarkSprintfTruncateString(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%.3s", "日本語日本語日本語日本語") |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfTruncateBytes(b *testing.B) { |
| var bytes any = []byte("日本語日本語日本語日本語") |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%.3s", bytes) |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfSlowParsingPath(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%.v", nil) |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfQuoteString(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%q", "日本語日本語日本語") |
| } |
| }) |
| } |
| |
| 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 BenchmarkSprintfComplex(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%f", 5.23184+5.23184i) |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfBoolean(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%t", true) |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfHexString(b *testing.B) { |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("% #x", "0123456789abcdef") |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfHexBytes(b *testing.B) { |
| data := []byte("0123456789abcdef") |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("% #x", data) |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfBytes(b *testing.B) { |
| data := []byte("0123456789abcdef") |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%v", data) |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfStringer(b *testing.B) { |
| stringer := I(12345) |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%v", stringer) |
| } |
| }) |
| } |
| |
| func BenchmarkSprintfStructure(b *testing.B) { |
| s := &[]any{SI{12345}, map[int]string{0: "hello"}} |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| Sprintf("%#v", s) |
| } |
| }) |
| } |
| |
| 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 any = 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) { |
| switch { |
| case testing.Short(): |
| t.Skip("skipping malloc count in short mode") |
| case runtime.GOMAXPROCS(0) > 1: |
| t.Skip("skipping; GOMAXPROCS>1") |
| case race.Enabled: |
| t.Skip("skipping malloc count under race detector") |
| } |
| 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(rune(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 ...any) []any { return a } |
| |
| var startests = []struct { |
| fmt string |
| in []any |
| out string |
| }{ |
| {"%*d", args(4, 42), " 42"}, |
| {"%-*d", args(4, 42), "42 "}, |
| {"%*d", args(-4, 42), "42 "}, |
| {"%-*d", args(-4, 42), "42 "}, |
| {"%.*d", args(4, 42), "0042"}, |
| {"%*.*d", args(8, 4, 42), " 0042"}, |
| {"%0*d", args(4, 42), "0042"}, |
| // Some non-int types for width. (Issue 10732). |
| {"%0*d", args(uint(4), 42), "0042"}, |
| {"%0*d", args(uint64(4), 42), "0042"}, |
| {"%0*d", args('\x04', 42), "0042"}, |
| {"%0*d", args(uintptr(4), 42), "0042"}, |
| |
| // erroneous |
| {"%*d", args(nil, 42), "%!(BADWIDTH)42"}, |
| {"%*d", args(int(1e7), 42), "%!(BADWIDTH)42"}, |
| {"%*d", args(int(-1e7), 42), "%!(BADWIDTH)42"}, |
| {"%.*d", args(nil, 42), "%!(BADPREC)42"}, |
| {"%.*d", args(-1, 42), "%!(BADPREC)42"}, |
| {"%.*d", args(int(1e7), 42), "%!(BADPREC)42"}, |
| {"%.*d", args(uint(1e7), 42), "%!(BADPREC)42"}, |
| {"%.*d", args(uint64(1<<63), 42), "%!(BADPREC)42"}, // Huge negative (-inf). |
| {"%.*d", args(uint64(1<<64-1), 42), "%!(BADPREC)42"}, // Small negative (-1). |
| {"%*d", args(5, "foo"), "%!d(string= foo)"}, |
| {"%*% %d", args(20, 5), "% 5"}, |
| {"%*", args(4), "%!(NOVERB)"}, |
| } |
| |
| func TestWidthAndPrecision(t *testing.T) { |
| for i, tt := range startests { |
| s := Sprintf(tt.fmt, tt.in...) |
| if s != tt.out { |
| t.Errorf("#%d: %q: got %q expected %q", i, tt.fmt, s, tt.out) |
| } |
| } |
| } |
| |
| // PanicS is a type that panics in String. |
| type PanicS struct { |
| message any |
| } |
| |
| // Value receiver. |
| func (p PanicS) String() string { |
| panic(p.message) |
| } |
| |
| // PanicGo is a type that panics in GoString. |
| type PanicGo struct { |
| message any |
| } |
| |
| // Value receiver. |
| func (p PanicGo) GoString() string { |
| panic(p.message) |
| } |
| |
| // PanicF is a type that panics in Format. |
| type PanicF struct { |
| message any |
| } |
| |
| // Value receiver. |
| func (p PanicF) Format(f State, c rune) { |
| panic(p.message) |
| } |
| |
| var panictests = []struct { |
| fmt string |
| in any |
| out string |
| }{ |
| // String |
| {"%s", (*PanicS)(nil), "<nil>"}, // nil pointer special case |
| {"%s", PanicS{io.ErrUnexpectedEOF}, "%!s(PANIC=String method: unexpected EOF)"}, |
| {"%s", PanicS{3}, "%!s(PANIC=String method: 3)"}, |
| // GoString |
| {"%#v", (*PanicGo)(nil), "<nil>"}, // nil pointer special case |
| {"%#v", PanicGo{io.ErrUnexpectedEOF}, "%!v(PANIC=GoString method: unexpected EOF)"}, |
| {"%#v", PanicGo{3}, "%!v(PANIC=GoString method: 3)"}, |
| // Issue 18282. catchPanic should not clear fmtFlags permanently. |
| {"%#v", []any{PanicGo{3}, PanicGo{3}}, "[]interface {}{%!v(PANIC=GoString method: 3), %!v(PANIC=GoString method: 3)}"}, |
| // Format |
| {"%s", (*PanicF)(nil), "<nil>"}, // nil pointer special case |
| {"%s", PanicF{io.ErrUnexpectedEOF}, "%!s(PANIC=Format method: unexpected EOF)"}, |
| {"%s", PanicF{3}, "%!s(PANIC=Format method: 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 hideFromVet(s string) string { return s } |
| |
| func TestNilDoesNotBecomeTyped(t *testing.T) { |
| type A struct{} |
| type B struct{} |
| var a *A = nil |
| var b B = B{} |
| got := Sprintf(hideFromVet("%s %s %s %s %s"), nil, a, nil, b, nil) |
| 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 any |
| 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) |
| } |
| } |
| } |
| |
| func TestParsenum(t *testing.T) { |
| testCases := []struct { |
| s string |
| start, end int |
| num int |
| isnum bool |
| newi int |
| }{ |
| {"a123", 0, 4, 0, false, 0}, |
| {"1234", 1, 1, 0, false, 1}, |
| {"123a", 0, 4, 123, true, 3}, |
| {"12a3", 0, 4, 12, true, 2}, |
| {"1234", 0, 4, 1234, true, 4}, |
| {"1a234", 1, 3, 0, false, 1}, |
| } |
| for _, tt := range testCases { |
| num, isnum, newi := Parsenum(tt.s, tt.start, tt.end) |
| if num != tt.num || isnum != tt.isnum || newi != tt.newi { |
| t.Errorf("parsenum(%q, %d, %d) = %d, %v, %d, want %d, %v, %d", tt.s, tt.start, tt.end, num, isnum, newi, tt.num, tt.isnum, tt.newi) |
| } |
| } |
| } |
| |
| // Test the various Append printers. The details are well tested above; |
| // here we just make sure the byte slice is updated. |
| |
| const ( |
| appendResult = "hello world, 23" |
| hello = "hello " |
| ) |
| |
| func TestAppendf(t *testing.T) { |
| b := make([]byte, 100) |
| b = b[:copy(b, hello)] |
| got := Appendf(b, "world, %d", 23) |
| if string(got) != appendResult { |
| t.Fatalf("Appendf returns %q not %q", got, appendResult) |
| } |
| if &b[0] != &got[0] { |
| t.Fatalf("Appendf allocated a new slice") |
| } |
| } |
| |
| func TestAppend(t *testing.T) { |
| b := make([]byte, 100) |
| b = b[:copy(b, hello)] |
| got := Append(b, "world", ", ", 23) |
| if string(got) != appendResult { |
| t.Fatalf("Append returns %q not %q", got, appendResult) |
| } |
| if &b[0] != &got[0] { |
| t.Fatalf("Append allocated a new slice") |
| } |
| } |
| |
| func TestAppendln(t *testing.T) { |
| b := make([]byte, 100) |
| b = b[:copy(b, hello)] |
| got := Appendln(b, "world,", 23) |
| if string(got) != appendResult+"\n" { |
| t.Fatalf("Appendln returns %q not %q", got, appendResult+"\n") |
| } |
| if &b[0] != &got[0] { |
| t.Fatalf("Appendln allocated a new slice") |
| } |
| } |
