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-rw-r--r--src/fmt/fmt_test.go1310
1 files changed, 1310 insertions, 0 deletions
diff --git a/src/fmt/fmt_test.go b/src/fmt/fmt_test.go
new file mode 100644
index 000000000..ff5fa79a3
--- /dev/null
+++ b/src/fmt/fmt_test.go
@@ -0,0 +1,1310 @@
+// 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 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)
+ 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)
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-20 10:37:19 +0000