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author | Ian Lance Taylor <ian@gcc.gnu.org> | 2010-12-03 04:34:57 +0000 |
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committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2010-12-03 04:34:57 +0000 |
commit | 7a9389330e91acc3ed05deac2d198af25d13cf3c (patch) | |
tree | 38fe54a4f38ede5d949c915d66191f24a6fe5153 /libgo/go/fmt/fmt_test.go | |
parent | 1aa6700378e5188a853c018256113ce6e1fb5c05 (diff) | |
download | gcc-7a9389330e91acc3ed05deac2d198af25d13cf3c.tar.gz |
Add Go frontend, libgo library, and Go testsuite.
gcc/:
* gcc.c (default_compilers): Add entry for ".go".
* common.opt: Add -static-libgo as a driver option.
* doc/install.texi (Configuration): Mention libgo as an option for
--enable-shared. Mention go as an option for --enable-languages.
* doc/invoke.texi (Overall Options): Mention .go as a file name
suffix. Mention go as a -x option.
* doc/frontends.texi (G++ and GCC): Mention Go as a supported
language.
* doc/sourcebuild.texi (Top Level): Mention libgo.
* doc/standards.texi (Standards): Add section on Go language.
Move references for other languages into their own section.
* doc/contrib.texi (Contributors): Mention that I contributed the
Go frontend.
gcc/testsuite/:
* lib/go.exp: New file.
* lib/go-dg.exp: New file.
* lib/go-torture.exp: New file.
* lib/target-supports.exp (check_compile): Match // Go.
From-SVN: r167407
Diffstat (limited to 'libgo/go/fmt/fmt_test.go')
-rw-r--r-- | libgo/go/fmt/fmt_test.go | 652 |
1 files changed, 652 insertions, 0 deletions
diff --git a/libgo/go/fmt/fmt_test.go b/libgo/go/fmt/fmt_test.go new file mode 100644 index 00000000000..2c09e0713b7 --- /dev/null +++ b/libgo/go/fmt/fmt_test.go @@ -0,0 +1,652 @@ +// 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 ( + . "fmt" + "io" + "math" + "runtime" // for the malloc count test only + "strings" + "testing" +) + +type ( + renamedBool bool + renamedInt int + renamedInt8 int8 + renamedInt16 int16 + renamedInt32 int32 + renamedInt64 int64 + renamedUint uint + renamedUint8 uint8 + renamedUint16 uint16 + renamedUint32 uint32 + renamedUint64 uint64 + renamedUintptr uintptr + renamedString string + renamedBytes []byte + renamedFloat float + renamedFloat32 float32 + renamedFloat64 float64 + renamedComplex complex + 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") + } +} + +type fmtTest struct { + fmt string + val interface{} + out string +} + +const b32 uint32 = 1<<32 - 1 +const b64 uint64 = 1<<64 - 1 + +var array = []int{1, 2, 3, 4, 5} +var iarray = []interface{}{1, "hello", 2.5, nil} + +type A struct { + i int + j uint + s string + x []int +} + +type I int + +func (i I) String() string { return Sprintf("<%d>", int(i)) } + +type B struct { + i I + j int +} + +type C struct { + i int + B +} + +type F int + +func (f F) Format(s State, c int) { + Fprintf(s, "<%c=F(%d)>", c, int(f)) +} + +type G int + +func (g G) GoString() string { + return Sprintf("GoString(%d)", int(g)) +} + +type S struct { + f F // a struct field that Formats + g G // a struct field that GoStrings +} + +// A type with a String method with pointer receiver for testing %p +type P int + +var pValue P + +func (p *P) String() string { + return "String(p)" +} + +var b byte + +var fmttests = []fmtTest{ + {"%d", 12345, "12345"}, + {"%v", 12345, "12345"}, + {"%t", true, "true"}, + + // basic string + {"%s", "abc", "abc"}, + {"%x", "abc", "616263"}, + {"%x", "xyz", "78797a"}, + {"%X", "xyz", "78797A"}, + {"%q", "abc", `"abc"`}, + + // basic bytes + {"%s", []byte("abc"), "abc"}, + {"%x", []byte("abc"), "616263"}, + {"% x", []byte("abc"), "61 62 63"}, + {"%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", `"\u263a"`}, + {"%q", "\U0010ffff", `"\U0010ffff"`}, + + // width + {"%5s", "abc", " abc"}, + {"%2s", "\u263a", " \u263a"}, + {"%-5s", "abc", "abc "}, + {"%05s", "abc", "00abc"}, + + // 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"}, + + // floats + {"%+.3e", 0.0, "+0.000e+00"}, + {"%+.3e", 1.0, "+1.000e+00"}, + {"%+.3f", -1.0, "-1.000"}, + {"% .3E", -1.0, "-1.000E+00"}, + {"% .3e", 1.0, " 1.000e+00"}, + {"%+.3g", 0.0, "+0"}, + {"%+.3g", 1.0, "+1"}, + {"%+.3g", -1.0, "-1"}, + {"% .3g", -1.0, "-1"}, + {"% .3g", 1.0, " 1"}, + + // complex values + {"%+.3e", 0i, "(+0.000e+00+0.000e+00i)"}, + {"%+.3f", 0i, "(+0.000+0.000i)"}, + {"%+.3g", 0i, "(+0+0i)"}, + {"%+.3e", 1 + 2i, "(+1.000e+00+2.000e+00i)"}, + {"%+.3f", 1 + 2i, "(+1.000+2.000i)"}, + {"%+.3g", 1 + 2i, "(+1+2i)"}, + {"%.3e", 0i, "(0.000e+00+0.000e+00i)"}, + {"%.3f", 0i, "(0.000+0.000i)"}, + {"%.3g", 0i, "(0+0i)"}, + {"%.3e", 1 + 2i, "(1.000e+00+2.000e+00i)"}, + {"%.3f", 1 + 2i, "(1.000+2.000i)"}, + {"%.3g", 1 + 2i, "(1+2i)"}, + {"%.3e", -1 - 2i, "(-1.000e+00-2.000e+00i)"}, + {"%.3f", -1 - 2i, "(-1.000-2.000i)"}, + {"%.3g", -1 - 2i, "(-1-2i)"}, + {"% .3E", -1 - 2i, "(-1.000E+00-2.000E+00i)"}, + {"%+.3g", complex64(1 + 2i), "(+1+2i)"}, + {"%+.3g", complex128(1 + 2i), "(+1+2i)"}, + + // erroneous formats + {"", 2, "%!(EXTRA int=2)"}, + {"%d", "hello", "%!d(string=hello)"}, + + // old test/fmt_test.go + {"%d", 1234, "1234"}, + {"%d", -1234, "-1234"}, + {"%d", uint(1234), "1234"}, + {"%d", uint32(b32), "4294967295"}, + {"%d", uint64(b64), "18446744073709551615"}, + {"%o", 01234, "1234"}, + {"%#o", 01234, "01234"}, + {"%o", uint32(b32), "37777777777"}, + {"%o", uint64(b64), "1777777777777777777777"}, + {"%x", 0x1234abcd, "1234abcd"}, + {"%#x", 0x1234abcd, "0x1234abcd"}, + {"%x", b32 - 0x1234567, "fedcba98"}, + {"%X", 0x1234abcd, "1234ABCD"}, + {"%X", b32 - 0x1234567, "FEDCBA98"}, + {"%#X", 0, "0X0"}, + {"%x", b64, "ffffffffffffffff"}, + {"%b", 7, "111"}, + {"%b", b64, "1111111111111111111111111111111111111111111111111111111111111111"}, + {"%b", -6, "-110"}, + {"%e", float64(1), "1.000000e+00"}, + {"%e", float64(1234.5678e3), "1.234568e+06"}, + {"%e", float64(1234.5678e-8), "1.234568e-05"}, + {"%e", float64(-7), "-7.000000e+00"}, + {"%e", float64(-1e-9), "-1.000000e-09"}, + {"%f", float64(1234.5678e3), "1234567.800000"}, + {"%f", float64(1234.5678e-8), "0.000012"}, + {"%f", float64(-7), "-7.000000"}, + {"%f", float64(-1e-9), "-0.000000"}, + {"%g", float64(1234.5678e3), "1.2345678e+06"}, + {"%g", float32(1234.5678e3), "1.2345678e+06"}, + {"%g", float64(1234.5678e-8), "1.2345678e-05"}, + {"%g", float64(-7), "-7"}, + {"%g", float64(-1e-9), "-1e-09"}, + {"%g", float32(-1e-9), "-1e-09"}, + {"%E", float64(1), "1.000000E+00"}, + {"%E", float64(1234.5678e3), "1.234568E+06"}, + {"%E", float64(1234.5678e-8), "1.234568E-05"}, + {"%E", float64(-7), "-7.000000E+00"}, + {"%E", float64(-1e-9), "-1.000000E-09"}, + {"%G", float64(1234.5678e3), "1.2345678E+06"}, + {"%G", float32(1234.5678e3), "1.2345678E+06"}, + {"%G", float64(1234.5678e-8), "1.2345678E-05"}, + {"%G", float64(-7), "-7"}, + {"%G", float64(-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", float64(1.23456789e3), " 1234.567890"}, + {"%20f", float64(1.23456789e-3), " 0.001235"}, + {"%20f", float64(12345678901.23456789), " 12345678901.234568"}, + {"%-20f", float64(1.23456789e3), "1234.567890 "}, + {"%20.8f", float64(1.23456789e3), " 1234.56789000"}, + {"%20.8f", float64(1.23456789e-3), " 0.00123457"}, + {"%g", float64(1.23456789e3), "1234.56789"}, + {"%g", float64(1.23456789e-3), "0.00123456789"}, + {"%g", float64(1.23456789e20), "1.23456789e+20"}, + {"%20e", math.Inf(1), " +Inf"}, + {"%-20f", math.Inf(-1), "-Inf "}, + {"%20g", math.NaN(), " NaN"}, + + // arrays + {"%v", array, "[1 2 3 4 5]"}, + {"%v", iarray, "[1 hello 2.5 <nil>]"}, + {"%v", &array, "&[1 2 3 4 5]"}, + {"%v", &iarray, "&[1 hello 2.5 <nil>]"}, + + // complexes with %v + {"%v", 1 + 2i, "(1+2i)"}, + {"%v", complex64(1 + 2i), "(1+2i)"}, + {"%v", complex128(1 + 2i), "(1+2i)"}, + + // structs + {"%v", A{1, 2, "a", []int{1, 2}}, `{1 2 a [1 2]}`}, + {"%+v", A{1, 2, "a", []int{1, 2}}, `{i:1 j:2 s:a x:[1 2]}`}, + + // +v on structs with Stringable items + {"%+v", B{1, 2}, `{i:<1> j:2}`}, + {"%+v", C{1, B{2, 3}}, `{i:1 B:{i:<2> j:3}}`}, + + // q on Stringable items + {"%s", I(23), `<23>`}, + {"%q", I(23), `"<23>"`}, + {"%x", I(23), `3c32333e`}, + {"%d", I(23), `%!d(string=<23>)`}, + + // go syntax + {"%#v", A{1, 2, "a", []int{1, 2}}, `fmt_test.A{i:1, j:0x2, s:"a", x:[]int{1, 2}}`}, + {"%#v", &b, "(*uint8)(PTR)"}, + {"%#v", TestFmtInterface, "(func(*testing.T))(PTR)"}, + {"%#v", make(chan int), "(chan int)(PTR)"}, + {"%#v", uint64(1<<64 - 1), "0xffffffffffffffff"}, + {"%#v", 1000000000, "1000000000"}, + {"%#v", map[string]int{"a": 1, "b": 2}, `map[string] int{"a":1, "b":2}`}, + {"%#v", map[string]B{"a": {1, 2}, "b": {3, 4}}, `map[string] fmt_test.B{"a":fmt_test.B{i:1, j:2}, "b":fmt_test.B{i:3, j:4}}`}, + {"%#v", []string{"a", "b"}, `[]string{"a", "b"}`}, + + // slices with other formats + {"%#x", []int{1, 2, 15}, `[0x1 0x2 0xf]`}, + {"%x", []int{1, 2, 15}, `[1 2 f]`}, + {"%d", []int{1, 2, 15}, `[1 2 15]`}, + {"%d", []byte{1, 2, 15}, `[1 2 15]`}, + {"%q", []string{"a", "b"}, `["a" "b"]`}, + + // renamings + {"%v", renamedBool(true), "true"}, + {"%d", renamedBool(true), "%!d(fmt_test.renamedBool=true)"}, + {"%o", renamedInt(8), "10"}, + {"%d", renamedInt8(-9), "-9"}, + {"%v", renamedInt16(10), "10"}, + {"%v", renamedInt32(-11), "-11"}, + {"%X", renamedInt64(255), "FF"}, + {"%v", renamedUint(13), "13"}, + {"%o", renamedUint8(14), "16"}, + {"%X", renamedUint16(15), "F"}, + {"%d", renamedUint32(16), "16"}, + {"%X", renamedUint64(17), "11"}, + {"%o", renamedUintptr(18), "22"}, + {"%x", renamedString("thing"), "7468696e67"}, + {"%d", renamedBytes([]byte{1, 2, 15}), `[1 2 15]`}, + {"%q", renamedBytes([]byte("hello")), `"hello"`}, + {"%v", renamedFloat(11), "11"}, + {"%v", renamedFloat32(22), "22"}, + {"%v", renamedFloat64(33), "33"}, + {"%v", renamedComplex(7 + .2i), "(7+0.2i)"}, + {"%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), "complex"}, + {"%T", renamedComplex128(4 - 3i), "fmt_test.renamedComplex128"}, + {"%T", intVal, "int"}, + {"%6T", &intVal, " *int"}, + + // %p + {"p0=%p", new(int), "p0=PTR"}, + {"p1=%s", &pValue, "p1=String(p)"}, // String method... + {"p2=%p", &pValue, "p2=PTR"}, // ... not called with %p + + // %p on non-pointers + {"%p", make(chan int), "PTR"}, + {"%p", make(map[int]int), "PTR"}, + {"%p", make([]int, 1), "PTR"}, + {"%p", 27, "%!p(int=27)"}, // not a pointer at all + + // erroneous things + {"%d", "hello", "%!d(string=hello)"}, + {"no args", "hello", "no args%!(EXTRA string=hello)"}, + {"%s", nil, "%!s(<nil>)"}, + {"%T", nil, "<nil>"}, + {"%-1", 100, "%!1(int=100)"}, +} + +func TestSprintf(t *testing.T) { + for _, tt := range fmttests { + s := Sprintf(tt.fmt, tt.val) + if i := strings.Index(s, "0x"); i >= 0 && strings.Contains(tt.out, "PTR") { + j := i + 2 + for ; j < len(s); j++ { + c := s[j] + if (c < '0' || c > '9') && (c < 'a' || c > 'f') && (c < 'A' || c > 'F') { + break + } + } + s = s[0:i] + "PTR" + s[j:] + } + if s != tt.out { + if _, ok := tt.val.(string); ok { + // Don't requote the already-quoted strings. + // It's too confusing to read the errors. + t.Errorf("Sprintf(%q, %q) = <%s> want <%s>", tt.fmt, tt.val, s, tt.out) + } else { + t.Errorf("Sprintf(%q, %v) = %q want %q", tt.fmt, tt.val, s, tt.out) + } + } + } +} + +func BenchmarkSprintfEmpty(b *testing.B) { + for i := 0; i < b.N; i++ { + Sprintf("") + } +} + +func BenchmarkSprintfString(b *testing.B) { + for i := 0; i < b.N; i++ { + Sprintf("%s", "hello") + } +} + +func BenchmarkSprintfInt(b *testing.B) { + for i := 0; i < b.N; i++ { + Sprintf("%d", 5) + } +} + +func BenchmarkSprintfIntInt(b *testing.B) { + for i := 0; i < b.N; i++ { + Sprintf("%d %d", 5, 6) + } +} + +func TestCountMallocs(t *testing.T) { + mallocs := 0 - runtime.MemStats.Mallocs + for i := 0; i < 100; i++ { + Sprintf("") + } + mallocs += runtime.MemStats.Mallocs + Printf("mallocs per Sprintf(\"\"): %d\n", mallocs/100) + mallocs = 0 - runtime.MemStats.Mallocs + for i := 0; i < 100; i++ { + Sprintf("xxx") + } + mallocs += runtime.MemStats.Mallocs + Printf("mallocs per Sprintf(\"xxx\"): %d\n", mallocs/100) + mallocs = 0 - runtime.MemStats.Mallocs + for i := 0; i < 100; i++ { + Sprintf("%x", i) + } + mallocs += runtime.MemStats.Mallocs + Printf("mallocs per Sprintf(\"%%x\"): %d\n", mallocs/100) + mallocs = 0 - runtime.MemStats.Mallocs + for i := 0; i < 100; i++ { + Sprintf("%x %x", i, i) + } + mallocs += runtime.MemStats.Mallocs + Printf("mallocs per Sprintf(\"%%x %%x\"): %d\n", mallocs/100) +} + +type flagPrinter struct{} + +func (*flagPrinter) Format(f State, c int) { + s := "%" + for i := 0; i < 128; i++ { + if f.Flag(i) { + s += string(i) + } + } + if w, ok := f.Width(); ok { + s += Sprintf("%d", w) + } + if p, ok := f.Precision(); ok { + s += Sprintf(".%d", p) + } + s += string(c) + io.WriteString(f, "["+s+"]") +} + +type flagTest struct { + in string + out string +} + +var flagtests = []flagTest{ + {"%a", "[%a]"}, + {"%-a", "[%-a]"}, + {"%+a", "[%+a]"}, + {"%#a", "[%#a]"}, + {"% a", "[% a]"}, + {"%0a", "[%0a]"}, + {"%1.2a", "[%1.2a]"}, + {"%-1.2a", "[%-1.2a]"}, + {"%+1.2a", "[%+1.2a]"}, + {"%-+1.2a", "[%+-1.2a]"}, + {"%-+1.2abc", "[%+-1.2a]bc"}, + {"%-1.2abc", "[%-1.2a]bc"}, +} + +func TestFlagParser(t *testing.T) { + var flagprinter flagPrinter + for _, tt := range flagtests { + s := Sprintf(tt.in, &flagprinter) + if s != tt.out { + t.Errorf("Sprintf(%q, &flagprinter) => %q, want %q", tt.in, s, tt.out) + } + } +} + +func TestStructPrinter(t *testing.T) { + var s struct { + a string + b string + c int + } + s.a = "abc" + s.b = "def" + s.c = 123 + type Test struct { + fmt string + out string + } + var tests = []Test{ + {"%v", "{abc def 123}"}, + {"%+v", "{a:abc b:def c:123}"}, + } + for _, tt := range tests { + out := Sprintf(tt.fmt, s) + if out != tt.out { + t.Errorf("Sprintf(%q, &s) = %q, want %q", tt.fmt, out, tt.out) + } + } +} + +// Check map printing using substrings so we don't depend on the print order. +func presentInMap(s string, a []string, t *testing.T) { + for i := 0; i < len(a); i++ { + loc := strings.Index(s, a[i]) + if loc < 0 { + t.Errorf("map print: expected to find %q in %q", a[i], s) + } + // make sure the match ends here + loc += len(a[i]) + if loc >= len(s) || (s[loc] != ' ' && s[loc] != ']') { + t.Errorf("map print: %q not properly terminated in %q", a[i], s) + } + } +} + +func TestMapPrinter(t *testing.T) { + m0 := make(map[int]string) + s := Sprint(m0) + if s != "map[]" { + t.Errorf("empty map printed as %q not %q", s, "map[]") + } + m1 := map[int]string{1: "one", 2: "two", 3: "three"} + a := []string{"1:one", "2:two", "3:three"} + presentInMap(Sprintf("%v", m1), a, t) + presentInMap(Sprint(m1), a, t) +} + +func TestEmptyMap(t *testing.T) { + const emptyMapStr = "map[]" + var m map[string]int + s := Sprint(m) + if s != emptyMapStr { + t.Errorf("nil map printed as %q not %q", s, emptyMapStr) + } + m = make(map[string]int) + s = Sprint(m) + if s != emptyMapStr { + t.Errorf("empty map printed as %q not %q", s, emptyMapStr) + } +} + +// Check that Sprint (and hence Print, Fprint) puts spaces in the right places, +// that is, between arg pairs in which neither is a string. +func TestBlank(t *testing.T) { + got := Sprint("<", 1, ">:", 1, 2, 3, "!") + expect := "<1>:1 2 3!" + if got != expect { + t.Errorf("got %q expected %q", got, expect) + } +} + +// Check that Sprintln (and hence Println, Fprintln) puts spaces in the right places, +// that is, between all arg pairs. +func TestBlankln(t *testing.T) { + got := Sprintln("<", 1, ">:", 1, 2, 3, "!") + expect := "< 1 >: 1 2 3 !\n" + if got != expect { + t.Errorf("got %q expected %q", got, expect) + } +} + + +// Check Formatter with Sprint, Sprintln, Sprintf +func TestFormatterPrintln(t *testing.T) { + f := F(1) + expect := "<v=F(1)>\n" + s := Sprint(f, "\n") + if s != expect { + t.Errorf("Sprint wrong with Formatter: expected %q got %q", expect, s) + } + s = Sprintln(f) + if s != expect { + t.Errorf("Sprintln wrong with Formatter: expected %q got %q", expect, s) + } + s = Sprintf("%v\n", f) + if s != expect { + t.Errorf("Sprintf wrong with Formatter: expected %q got %q", expect, s) + } +} + +func args(a ...interface{}) []interface{} { return a } + +type starTest struct { + fmt string + in []interface{} + out string +} + +var startests = []starTest{ + {"%*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), "%!(BADWIDTH)%!*(int=4)"}, + {"%*d", args(int32(4), 42), "%!(BADWIDTH)42"}, +} + +// TODO: there's no conversion from []T to ...T, but we can fake it. These +// functions do the faking. We index the table by the length of the param list. +var sprintf = []func(string, []interface{}) string{ + 0: func(f string, i []interface{}) string { return Sprintf(f) }, + 1: func(f string, i []interface{}) string { return Sprintf(f, i[0]) }, + 2: func(f string, i []interface{}) string { return Sprintf(f, i[0], i[1]) }, + 3: func(f string, i []interface{}) string { return Sprintf(f, i[0], i[1], i[2]) }, +} + +func TestWidthAndPrecision(t *testing.T) { + for _, tt := range startests { + s := sprintf[len(tt.in)](tt.fmt, tt.in) + if s != tt.out { + t.Errorf("got %q expected %q", s, tt.out) + } + } +} |