816 lines
21 KiB
Go
816 lines
21 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package fmt_test
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import (
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"bytes"
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. "fmt"
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"io"
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"math"
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"runtime" // for the malloc count test only
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"strings"
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"testing"
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"time"
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)
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type (
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renamedBool bool
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renamedInt int
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renamedInt8 int8
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renamedInt16 int16
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renamedInt32 int32
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renamedInt64 int64
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renamedUint uint
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renamedUint8 uint8
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renamedUint16 uint16
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renamedUint32 uint32
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renamedUint64 uint64
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renamedUintptr uintptr
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renamedString string
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renamedBytes []byte
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renamedFloat32 float32
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renamedFloat64 float64
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renamedComplex64 complex64
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renamedComplex128 complex128
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)
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func TestFmtInterface(t *testing.T) {
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var i1 interface{}
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i1 = "abc"
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s := Sprintf("%s", i1)
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if s != "abc" {
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t.Errorf(`Sprintf("%%s", empty("abc")) = %q want %q`, s, "abc")
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}
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}
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const b32 uint32 = 1<<32 - 1
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const b64 uint64 = 1<<64 - 1
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var array = [5]int{1, 2, 3, 4, 5}
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var iarray = [4]interface{}{1, "hello", 2.5, nil}
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var slice = array[:]
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var islice = iarray[:]
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type A struct {
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i int
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j uint
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s string
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x []int
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}
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type I int
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func (i I) String() string { return Sprintf("<%d>", int(i)) }
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type B struct {
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I I
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j int
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}
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type C struct {
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i int
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B
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}
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type F int
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func (f F) Format(s State, c rune) {
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Fprintf(s, "<%c=F(%d)>", c, int(f))
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}
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type G int
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func (g G) GoString() string {
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return Sprintf("GoString(%d)", int(g))
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}
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type S struct {
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F F // a struct field that Formats
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G G // a struct field that GoStrings
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}
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type SI struct {
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I interface{}
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}
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// A type with a String method with pointer receiver for testing %p
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type P int
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var pValue P
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func (p *P) String() string {
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return "String(p)"
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}
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var b byte
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var fmttests = []struct {
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fmt string
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val interface{}
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out string
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}{
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{"%d", 12345, "12345"},
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{"%v", 12345, "12345"},
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{"%t", true, "true"},
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// basic string
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{"%s", "abc", "abc"},
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{"%x", "abc", "616263"},
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{"%x", "xyz", "78797a"},
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{"%X", "xyz", "78797A"},
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{"%q", "abc", `"abc"`},
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// basic bytes
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{"%s", []byte("abc"), "abc"},
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{"%x", []byte("abc"), "616263"},
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{"% x", []byte("abc\xff"), "61 62 63 ff"},
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{"% X", []byte("abc\xff"), "61 62 63 FF"},
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{"%x", []byte("xyz"), "78797a"},
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{"%X", []byte("xyz"), "78797A"},
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{"%q", []byte("abc"), `"abc"`},
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// escaped strings
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{"%#q", `abc`, "`abc`"},
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{"%#q", `"`, "`\"`"},
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{"1 %#q", `\n`, "1 `\\n`"},
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{"2 %#q", "\n", `2 "\n"`},
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{"%q", `"`, `"\""`},
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{"%q", "\a\b\f\r\n\t\v", `"\a\b\f\r\n\t\v"`},
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{"%q", "abc\xffdef", `"abc\xffdef"`},
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{"%q", "\u263a", `"☺"`},
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{"%+q", "\u263a", `"\u263a"`},
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{"%q", "\U0010ffff", `"\U0010ffff"`},
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// escaped characters
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{"%q", 'x', `'x'`},
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{"%q", 0, `'\x00'`},
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{"%q", '\n', `'\n'`},
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{"%q", '\u0e00', `'\u0e00'`}, // not a printable rune.
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{"%q", '\U000c2345', `'\U000c2345'`}, // not a printable rune.
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{"%q", int64(0x7FFFFFFF), `%!q(int64=2147483647)`},
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{"%q", uint64(0xFFFFFFFF), `%!q(uint64=4294967295)`},
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{"%q", '"', `'"'`},
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{"%q", '\'', `'\''`},
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{"%q", "\u263a", `"☺"`},
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{"%+q", "\u263a", `"\u263a"`},
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// width
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{"%5s", "abc", " abc"},
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{"%2s", "\u263a", " ☺"},
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{"%-5s", "abc", "abc "},
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{"%-8q", "abc", `"abc" `},
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{"%05s", "abc", "00abc"},
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{"%08q", "abc", `000"abc"`},
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{"%5s", "abcdefghijklmnopqrstuvwxyz", "abcdefghijklmnopqrstuvwxyz"},
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{"%.5s", "abcdefghijklmnopqrstuvwxyz", "abcde"},
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{"%.5s", "日本語日本語", "日本語日本"},
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{"%.5s", []byte("日本語日本語"), "日本語日本"},
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{"%.5q", "abcdefghijklmnopqrstuvwxyz", `"abcde"`},
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{"%.3q", "日本語日本語", `"日本語"`},
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{"%.3q", []byte("日本語日本語"), `"日本語"`},
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{"%10.1q", "日本語日本語", ` "日"`},
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// integers
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{"%d", 12345, "12345"},
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{"%d", -12345, "-12345"},
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{"%10d", 12345, " 12345"},
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{"%10d", -12345, " -12345"},
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{"%+10d", 12345, " +12345"},
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{"%010d", 12345, "0000012345"},
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{"%010d", -12345, "-000012345"},
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{"%-10d", 12345, "12345 "},
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{"%010.3d", 1, " 001"},
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{"%010.3d", -1, " -001"},
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{"%+d", 12345, "+12345"},
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{"%+d", -12345, "-12345"},
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{"%+d", 0, "+0"},
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{"% d", 0, " 0"},
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{"% d", 12345, " 12345"},
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{"%.0d", 0, ""},
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{"%.d", 0, ""},
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// unicode format
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{"%U", 0x1, "U+0001"},
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{"%U", uint(0x1), "U+0001"},
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{"%.8U", 0x2, "U+00000002"},
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{"%U", 0x1234, "U+1234"},
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{"%U", 0x12345, "U+12345"},
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{"%10.6U", 0xABC, " U+000ABC"},
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{"%-10.6U", 0xABC, "U+000ABC "},
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{"%U", '\n', `U+000A`},
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{"%#U", '\n', `U+000A`},
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{"%U", 'x', `U+0078`},
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{"%#U", 'x', `U+0078 'x'`},
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{"%U", '\u263a', `U+263A`},
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{"%#U", '\u263a', `U+263A '☺'`},
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// floats
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{"%+.3e", 0.0, "+0.000e+00"},
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{"%+.3e", 1.0, "+1.000e+00"},
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{"%+.3f", -1.0, "-1.000"},
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{"% .3E", -1.0, "-1.000E+00"},
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{"% .3e", 1.0, " 1.000e+00"},
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{"%+.3g", 0.0, "+0"},
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{"%+.3g", 1.0, "+1"},
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{"%+.3g", -1.0, "-1"},
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{"% .3g", -1.0, "-1"},
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{"% .3g", 1.0, " 1"},
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// complex values
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{"%+.3e", 0i, "(+0.000e+00+0.000e+00i)"},
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{"%+.3f", 0i, "(+0.000+0.000i)"},
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{"%+.3g", 0i, "(+0+0i)"},
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{"%+.3e", 1 + 2i, "(+1.000e+00+2.000e+00i)"},
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{"%+.3f", 1 + 2i, "(+1.000+2.000i)"},
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{"%+.3g", 1 + 2i, "(+1+2i)"},
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{"%.3e", 0i, "(0.000e+00+0.000e+00i)"},
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{"%.3f", 0i, "(0.000+0.000i)"},
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{"%.3g", 0i, "(0+0i)"},
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{"%.3e", 1 + 2i, "(1.000e+00+2.000e+00i)"},
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{"%.3f", 1 + 2i, "(1.000+2.000i)"},
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{"%.3g", 1 + 2i, "(1+2i)"},
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{"%.3e", -1 - 2i, "(-1.000e+00-2.000e+00i)"},
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{"%.3f", -1 - 2i, "(-1.000-2.000i)"},
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{"%.3g", -1 - 2i, "(-1-2i)"},
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{"% .3E", -1 - 2i, "(-1.000E+00-2.000E+00i)"},
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{"%+.3g", complex64(1 + 2i), "(+1+2i)"},
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{"%+.3g", complex128(1 + 2i), "(+1+2i)"},
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// erroneous formats
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{"", 2, "%!(EXTRA int=2)"},
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{"%d", "hello", "%!d(string=hello)"},
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// old test/fmt_test.go
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{"%d", 1234, "1234"},
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{"%d", -1234, "-1234"},
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{"%d", uint(1234), "1234"},
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{"%d", uint32(b32), "4294967295"},
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{"%d", uint64(b64), "18446744073709551615"},
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{"%o", 01234, "1234"},
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{"%#o", 01234, "01234"},
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{"%o", uint32(b32), "37777777777"},
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{"%o", uint64(b64), "1777777777777777777777"},
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{"%x", 0x1234abcd, "1234abcd"},
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{"%#x", 0x1234abcd, "0x1234abcd"},
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{"%x", b32 - 0x1234567, "fedcba98"},
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{"%X", 0x1234abcd, "1234ABCD"},
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{"%X", b32 - 0x1234567, "FEDCBA98"},
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{"%#X", 0, "0X0"},
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{"%x", b64, "ffffffffffffffff"},
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{"%b", 7, "111"},
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{"%b", b64, "1111111111111111111111111111111111111111111111111111111111111111"},
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{"%b", -6, "-110"},
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{"%e", 1.0, "1.000000e+00"},
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{"%e", 1234.5678e3, "1.234568e+06"},
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{"%e", 1234.5678e-8, "1.234568e-05"},
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{"%e", -7.0, "-7.000000e+00"},
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{"%e", -1e-9, "-1.000000e-09"},
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{"%f", 1234.5678e3, "1234567.800000"},
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{"%f", 1234.5678e-8, "0.000012"},
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{"%f", -7.0, "-7.000000"},
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{"%f", -1e-9, "-0.000000"},
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{"%g", 1234.5678e3, "1.2345678e+06"},
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{"%g", float32(1234.5678e3), "1.2345678e+06"},
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{"%g", 1234.5678e-8, "1.2345678e-05"},
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{"%g", -7.0, "-7"},
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{"%g", -1e-9, "-1e-09"},
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{"%g", float32(-1e-9), "-1e-09"},
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{"%E", 1.0, "1.000000E+00"},
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{"%E", 1234.5678e3, "1.234568E+06"},
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{"%E", 1234.5678e-8, "1.234568E-05"},
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{"%E", -7.0, "-7.000000E+00"},
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{"%E", -1e-9, "-1.000000E-09"},
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{"%G", 1234.5678e3, "1.2345678E+06"},
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{"%G", float32(1234.5678e3), "1.2345678E+06"},
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{"%G", 1234.5678e-8, "1.2345678E-05"},
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{"%G", -7.0, "-7"},
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{"%G", -1e-9, "-1E-09"},
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{"%G", float32(-1e-9), "-1E-09"},
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{"%c", 'x', "x"},
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{"%c", 0xe4, "ä"},
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{"%c", 0x672c, "本"},
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{"%c", '日', "日"},
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{"%20.8d", 1234, " 00001234"},
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{"%20.8d", -1234, " -00001234"},
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{"%20d", 1234, " 1234"},
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{"%-20.8d", 1234, "00001234 "},
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{"%-20.8d", -1234, "-00001234 "},
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{"%-#20.8x", 0x1234abc, "0x01234abc "},
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{"%-#20.8X", 0x1234abc, "0X01234ABC "},
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{"%-#20.8o", 01234, "00001234 "},
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{"%.20b", 7, "00000000000000000111"},
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{"%20.5s", "qwertyuiop", " qwert"},
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{"%.5s", "qwertyuiop", "qwert"},
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{"%-20.5s", "qwertyuiop", "qwert "},
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{"%20c", 'x', " x"},
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{"%-20c", 'x', "x "},
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{"%20.6e", 1.2345e3, " 1.234500e+03"},
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{"%20.6e", 1.2345e-3, " 1.234500e-03"},
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{"%20e", 1.2345e3, " 1.234500e+03"},
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{"%20e", 1.2345e-3, " 1.234500e-03"},
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{"%20.8e", 1.2345e3, " 1.23450000e+03"},
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{"%20f", 1.23456789e3, " 1234.567890"},
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{"%20f", 1.23456789e-3, " 0.001235"},
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{"%20f", 12345678901.23456789, " 12345678901.234568"},
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{"%-20f", 1.23456789e3, "1234.567890 "},
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{"%20.8f", 1.23456789e3, " 1234.56789000"},
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{"%20.8f", 1.23456789e-3, " 0.00123457"},
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{"%g", 1.23456789e3, "1234.56789"},
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{"%g", 1.23456789e-3, "0.00123456789"},
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{"%g", 1.23456789e20, "1.23456789e+20"},
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{"%20e", math.Inf(1), " +Inf"},
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{"%-20f", math.Inf(-1), "-Inf "},
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{"%20g", math.NaN(), " NaN"},
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// arrays
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{"%v", array, "[1 2 3 4 5]"},
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{"%v", iarray, "[1 hello 2.5 <nil>]"},
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{"%v", &array, "&[1 2 3 4 5]"},
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{"%v", &iarray, "&[1 hello 2.5 <nil>]"},
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// slices
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{"%v", slice, "[1 2 3 4 5]"},
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{"%v", islice, "[1 hello 2.5 <nil>]"},
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{"%v", &slice, "&[1 2 3 4 5]"},
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{"%v", &islice, "&[1 hello 2.5 <nil>]"},
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// complexes with %v
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{"%v", 1 + 2i, "(1+2i)"},
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{"%v", complex64(1 + 2i), "(1+2i)"},
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{"%v", complex128(1 + 2i), "(1+2i)"},
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// structs
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{"%v", A{1, 2, "a", []int{1, 2}}, `{1 2 a [1 2]}`},
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{"%+v", A{1, 2, "a", []int{1, 2}}, `{i:1 j:2 s:a x:[1 2]}`},
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// +v on structs with Stringable items
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{"%+v", B{1, 2}, `{I:<1> j:2}`},
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{"%+v", C{1, B{2, 3}}, `{i:1 B:{I:<2> j:3}}`},
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// q on Stringable items
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{"%s", I(23), `<23>`},
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{"%q", I(23), `"<23>"`},
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{"%x", I(23), `3c32333e`},
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{"%d", I(23), `23`}, // Stringer applies only to string formats.
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// go syntax
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{"%#v", A{1, 2, "a", []int{1, 2}}, `fmt_test.A{i:1, j:0x2, s:"a", x:[]int{1, 2}}`},
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{"%#v", &b, "(*uint8)(0xPTR)"},
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{"%#v", TestFmtInterface, "(func(*testing.T))(0xPTR)"},
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{"%#v", make(chan int), "(chan int)(0xPTR)"},
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{"%#v", uint64(1<<64 - 1), "0xffffffffffffffff"},
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{"%#v", 1000000000, "1000000000"},
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{"%#v", map[string]int{"a": 1}, `map[string]int{"a":1}`},
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{"%#v", map[string]B{"a": {1, 2}}, `map[string]fmt_test.B{"a":fmt_test.B{I:1, j:2}}`},
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{"%#v", []string{"a", "b"}, `[]string{"a", "b"}`},
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{"%#v", SI{}, `fmt_test.SI{I:interface {}(nil)}`},
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{"%#v", []int(nil), `[]int(nil)`},
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{"%#v", []int{}, `[]int{}`},
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{"%#v", array, `[5]int{1, 2, 3, 4, 5}`},
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{"%#v", &array, `&[5]int{1, 2, 3, 4, 5}`},
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{"%#v", iarray, `[4]interface {}{1, "hello", 2.5, interface {}(nil)}`},
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{"%#v", &iarray, `&[4]interface {}{1, "hello", 2.5, interface {}(nil)}`},
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{"%#v", map[int]byte(nil), `map[int]uint8(nil)`},
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{"%#v", map[int]byte{}, `map[int]uint8{}`},
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// slices with other formats
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{"%#x", []int{1, 2, 15}, `[0x1 0x2 0xf]`},
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{"%x", []int{1, 2, 15}, `[1 2 f]`},
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{"%d", []int{1, 2, 15}, `[1 2 15]`},
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{"%d", []byte{1, 2, 15}, `[1 2 15]`},
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{"%q", []string{"a", "b"}, `["a" "b"]`},
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// renamings
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{"%v", renamedBool(true), "true"},
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{"%d", renamedBool(true), "%!d(fmt_test.renamedBool=true)"},
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{"%o", renamedInt(8), "10"},
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{"%d", renamedInt8(-9), "-9"},
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{"%v", renamedInt16(10), "10"},
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{"%v", renamedInt32(-11), "-11"},
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{"%X", renamedInt64(255), "FF"},
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{"%v", renamedUint(13), "13"},
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{"%o", renamedUint8(14), "16"},
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{"%X", renamedUint16(15), "F"},
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{"%d", renamedUint32(16), "16"},
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{"%X", renamedUint64(17), "11"},
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{"%o", renamedUintptr(18), "22"},
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{"%x", renamedString("thing"), "7468696e67"},
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{"%d", renamedBytes([]byte{1, 2, 15}), `[1 2 15]`},
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{"%q", renamedBytes([]byte("hello")), `"hello"`},
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{"%v", renamedFloat32(22), "22"},
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{"%v", renamedFloat64(33), "33"},
|
|
{"%v", renamedComplex64(3 + 4i), "(3+4i)"},
|
|
{"%v", renamedComplex128(4 - 3i), "(4-3i)"},
|
|
|
|
// Formatter
|
|
{"%x", F(1), "<x=F(1)>"},
|
|
{"%x", G(2), "2"},
|
|
{"%+v", S{F(4), G(5)}, "{F:<v=F(4)> G:5}"},
|
|
|
|
// GoStringer
|
|
{"%#v", G(6), "GoString(6)"},
|
|
{"%#v", S{F(7), G(8)}, "fmt_test.S{F:<v=F(7)>, G:GoString(8)}"},
|
|
|
|
// %T
|
|
{"%T", (4 - 3i), "complex128"},
|
|
{"%T", renamedComplex128(4 - 3i), "fmt_test.renamedComplex128"},
|
|
{"%T", intVal, "int"},
|
|
{"%6T", &intVal, " *int"},
|
|
|
|
// %p
|
|
{"p0=%p", new(int), "p0=0xPTR"},
|
|
{"p1=%s", &pValue, "p1=String(p)"}, // String method...
|
|
{"p2=%p", &pValue, "p2=0xPTR"}, // ... not called with %p
|
|
{"p4=%#p", new(int), "p4=PTR"},
|
|
|
|
// %p on non-pointers
|
|
{"%p", make(chan int), "0xPTR"},
|
|
{"%p", make(map[int]int), "0xPTR"},
|
|
{"%p", make([]int, 1), "0xPTR"},
|
|
{"%p", 27, "%!p(int=27)"}, // not a pointer at all
|
|
|
|
// %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)"},
|
|
}
|
|
|
|
func TestSprintf(t *testing.T) {
|
|
for _, tt := range fmttests {
|
|
s := Sprintf(tt.fmt, tt.val)
|
|
if i := strings.Index(tt.out, "PTR"); i >= 0 {
|
|
j := i
|
|
for ; j < len(s); j++ {
|
|
c := s[j]
|
|
if (c < '0' || c > '9') && (c < 'a' || c > 'f') && (c < 'A' || c > 'F') {
|
|
break
|
|
}
|
|
}
|
|
s = s[0:i] + "PTR" + s[j:]
|
|
}
|
|
if s != tt.out {
|
|
if _, ok := tt.val.(string); ok {
|
|
// Don't requote the already-quoted strings.
|
|
// It's too confusing to read the errors.
|
|
t.Errorf("Sprintf(%q, %q) = <%s> want <%s>", tt.fmt, tt.val, s, tt.out)
|
|
} else {
|
|
t.Errorf("Sprintf(%q, %v) = %q want %q", tt.fmt, tt.val, s, tt.out)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func BenchmarkSprintfEmpty(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
Sprintf("")
|
|
}
|
|
}
|
|
|
|
func BenchmarkSprintfString(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
Sprintf("%s", "hello")
|
|
}
|
|
}
|
|
|
|
func BenchmarkSprintfInt(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
Sprintf("%d", 5)
|
|
}
|
|
}
|
|
|
|
func BenchmarkSprintfIntInt(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
Sprintf("%d %d", 5, 6)
|
|
}
|
|
}
|
|
|
|
func BenchmarkSprintfPrefixedInt(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
Sprintf("This is some meaningless prefix text that needs to be scanned %d", 6)
|
|
}
|
|
}
|
|
|
|
func BenchmarkSprintfFloat(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
Sprintf("%g", 5.23184)
|
|
}
|
|
}
|
|
|
|
func TestCountMallocs(t *testing.T) {
|
|
if testing.Short() {
|
|
return
|
|
}
|
|
const N = 100
|
|
runtime.UpdateMemStats()
|
|
mallocs := 0 - runtime.MemStats.Mallocs
|
|
for i := 0; i < N; i++ {
|
|
Sprintf("")
|
|
}
|
|
runtime.UpdateMemStats()
|
|
mallocs += runtime.MemStats.Mallocs
|
|
Printf("mallocs per Sprintf(\"\"): %d\n", mallocs/N)
|
|
runtime.UpdateMemStats()
|
|
mallocs = 0 - runtime.MemStats.Mallocs
|
|
for i := 0; i < N; i++ {
|
|
Sprintf("xxx")
|
|
}
|
|
runtime.UpdateMemStats()
|
|
mallocs += runtime.MemStats.Mallocs
|
|
Printf("mallocs per Sprintf(\"xxx\"): %d\n", mallocs/N)
|
|
runtime.UpdateMemStats()
|
|
mallocs = 0 - runtime.MemStats.Mallocs
|
|
for i := 0; i < N; i++ {
|
|
Sprintf("%x", i)
|
|
}
|
|
runtime.UpdateMemStats()
|
|
mallocs += runtime.MemStats.Mallocs
|
|
Printf("mallocs per Sprintf(\"%%x\"): %d\n", mallocs/N)
|
|
runtime.UpdateMemStats()
|
|
mallocs = 0 - runtime.MemStats.Mallocs
|
|
for i := 0; i < N; i++ {
|
|
Sprintf("%s", "hello")
|
|
}
|
|
runtime.UpdateMemStats()
|
|
mallocs += runtime.MemStats.Mallocs
|
|
Printf("mallocs per Sprintf(\"%%s\"): %d\n", mallocs/N)
|
|
runtime.UpdateMemStats()
|
|
mallocs = 0 - runtime.MemStats.Mallocs
|
|
for i := 0; i < N; i++ {
|
|
Sprintf("%x %x", i, i)
|
|
}
|
|
runtime.UpdateMemStats()
|
|
mallocs += runtime.MemStats.Mallocs
|
|
Printf("mallocs per Sprintf(\"%%x %%x\"): %d\n", mallocs/N)
|
|
runtime.UpdateMemStats()
|
|
mallocs = 0 - runtime.MemStats.Mallocs
|
|
for i := 0; i < N; i++ {
|
|
Sprintf("%g", 3.14159)
|
|
}
|
|
runtime.UpdateMemStats()
|
|
mallocs += runtime.MemStats.Mallocs
|
|
Printf("mallocs per Sprintf(\"%%g\"): %d\n", mallocs/N)
|
|
buf := new(bytes.Buffer)
|
|
runtime.UpdateMemStats()
|
|
mallocs = 0 - runtime.MemStats.Mallocs
|
|
for i := 0; i < N; i++ {
|
|
buf.Reset()
|
|
Fprintf(buf, "%x %x %x", i, i, i)
|
|
}
|
|
runtime.UpdateMemStats()
|
|
mallocs += runtime.MemStats.Mallocs
|
|
Printf("mallocs per Fprintf(buf, \"%%x %%x %%x\"): %d\n", mallocs/N)
|
|
runtime.UpdateMemStats()
|
|
mallocs = 0 - runtime.MemStats.Mallocs
|
|
for i := 0; i < N; i++ {
|
|
buf.Reset()
|
|
Fprintf(buf, "%s", "hello")
|
|
}
|
|
runtime.UpdateMemStats()
|
|
mallocs += runtime.MemStats.Mallocs
|
|
Printf("mallocs per Fprintf(buf, \"%%s\"): %d\n", mallocs/N)
|
|
}
|
|
|
|
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) {
|
|
var s struct {
|
|
a string
|
|
b string
|
|
c int
|
|
}
|
|
s.a = "abc"
|
|
s.b = "def"
|
|
s.c = 123
|
|
var tests = []struct {
|
|
fmt string
|
|
out string
|
|
}{
|
|
{"%v", "{abc def 123}"},
|
|
{"%+v", "{a:abc b:def c:123}"},
|
|
}
|
|
for _, tt := range tests {
|
|
out := Sprintf(tt.fmt, s)
|
|
if out != tt.out {
|
|
t.Errorf("Sprintf(%q, &s) = %q, want %q", tt.fmt, out, tt.out)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check map printing using substrings so we don't depend on the print order.
|
|
func presentInMap(s string, a []string, t *testing.T) {
|
|
for i := 0; i < len(a); i++ {
|
|
loc := strings.Index(s, a[i])
|
|
if loc < 0 {
|
|
t.Errorf("map print: expected to find %q in %q", a[i], s)
|
|
}
|
|
// make sure the match ends here
|
|
loc += len(a[i])
|
|
if loc >= len(s) || (s[loc] != ' ' && s[loc] != ']') {
|
|
t.Errorf("map print: %q not properly terminated in %q", a[i], s)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestMapPrinter(t *testing.T) {
|
|
m0 := make(map[int]string)
|
|
s := Sprint(m0)
|
|
if s != "map[]" {
|
|
t.Errorf("empty map printed as %q not %q", s, "map[]")
|
|
}
|
|
m1 := map[int]string{1: "one", 2: "two", 3: "three"}
|
|
a := []string{"1:one", "2:two", "3:three"}
|
|
presentInMap(Sprintf("%v", m1), a, t)
|
|
presentInMap(Sprint(m1), a, t)
|
|
}
|
|
|
|
func TestEmptyMap(t *testing.T) {
|
|
const emptyMapStr = "map[]"
|
|
var m map[string]int
|
|
s := Sprint(m)
|
|
if s != emptyMapStr {
|
|
t.Errorf("nil map printed as %q not %q", s, emptyMapStr)
|
|
}
|
|
m = make(map[string]int)
|
|
s = Sprint(m)
|
|
if s != emptyMapStr {
|
|
t.Errorf("empty map printed as %q not %q", s, emptyMapStr)
|
|
}
|
|
}
|
|
|
|
// Check that Sprint (and hence Print, Fprint) puts spaces in the right places,
|
|
// that is, between arg pairs in which neither is a string.
|
|
func TestBlank(t *testing.T) {
|
|
got := Sprint("<", 1, ">:", 1, 2, 3, "!")
|
|
expect := "<1>:1 2 3!"
|
|
if got != expect {
|
|
t.Errorf("got %q expected %q", got, expect)
|
|
}
|
|
}
|
|
|
|
// Check that Sprintln (and hence Println, Fprintln) puts spaces in the right places,
|
|
// that is, between all arg pairs.
|
|
func TestBlankln(t *testing.T) {
|
|
got := Sprintln("<", 1, ">:", 1, 2, 3, "!")
|
|
expect := "< 1 >: 1 2 3 !\n"
|
|
if got != expect {
|
|
t.Errorf("got %q expected %q", got, expect)
|
|
}
|
|
}
|
|
|
|
// Check Formatter with Sprint, Sprintln, Sprintf
|
|
func TestFormatterPrintln(t *testing.T) {
|
|
f := F(1)
|
|
expect := "<v=F(1)>\n"
|
|
s := Sprint(f, "\n")
|
|
if s != expect {
|
|
t.Errorf("Sprint wrong with Formatter: expected %q got %q", expect, s)
|
|
}
|
|
s = Sprintln(f)
|
|
if s != expect {
|
|
t.Errorf("Sprintln wrong with Formatter: expected %q got %q", expect, s)
|
|
}
|
|
s = Sprintf("%v\n", f)
|
|
if s != expect {
|
|
t.Errorf("Sprintf wrong with Formatter: expected %q got %q", expect, s)
|
|
}
|
|
}
|
|
|
|
func args(a ...interface{}) []interface{} { return a }
|
|
|
|
var startests = []struct {
|
|
fmt string
|
|
in []interface{}
|
|
out string
|
|
}{
|
|
{"%*d", args(4, 42), " 42"},
|
|
{"%.*d", args(4, 42), "0042"},
|
|
{"%*.*d", args(8, 4, 42), " 0042"},
|
|
{"%0*d", args(4, 42), "0042"},
|
|
{"%-*d", args(4, 42), "42 "},
|
|
|
|
// erroneous
|
|
{"%*d", args(nil, 42), "%!(BADWIDTH)42"},
|
|
{"%.*d", args(nil, 42), "%!(BADPREC)42"},
|
|
{"%*d", args(5, "foo"), "%!d(string= foo)"},
|
|
{"%*% %d", args(20, 5), "% 5"},
|
|
{"%*", args(4), "%!(NOVERB)"},
|
|
{"%*d", args(int32(4), 42), "%!(BADWIDTH)42"},
|
|
}
|
|
|
|
func TestWidthAndPrecision(t *testing.T) {
|
|
for _, tt := range startests {
|
|
s := Sprintf(tt.fmt, tt.in...)
|
|
if s != tt.out {
|
|
t.Errorf("%q: got %q expected %q", tt.fmt, s, tt.out)
|
|
}
|
|
}
|
|
}
|
|
|
|
// A type that panics in String.
|
|
type Panic struct {
|
|
message interface{}
|
|
}
|
|
|
|
// Value receiver.
|
|
func (p Panic) GoString() string {
|
|
panic(p.message)
|
|
}
|
|
|
|
// Value receiver.
|
|
func (p Panic) String() string {
|
|
panic(p.message)
|
|
}
|
|
|
|
// A type that panics in Format.
|
|
type PanicF struct {
|
|
message interface{}
|
|
}
|
|
|
|
// Value receiver.
|
|
func (p PanicF) Format(f State, c 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 _, tt := range panictests {
|
|
s := Sprintf(tt.fmt, tt.in)
|
|
if s != tt.out {
|
|
t.Errorf("%q: got %q expected %q", tt.fmt, s, tt.out)
|
|
}
|
|
}
|
|
}
|