mirror of https://go.googlesource.com/go
1954 lines
59 KiB
Go
1954 lines
59 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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"internal/race"
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"io"
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"math"
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"reflect"
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"runtime"
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"strings"
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"testing"
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"time"
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"unicode"
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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 any
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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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var (
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NaN = math.NaN()
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posInf = math.Inf(1)
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negInf = math.Inf(-1)
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intVar = 0
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array = [5]int{1, 2, 3, 4, 5}
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iarray = [4]any{1, "hello", 2.5, nil}
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slice = array[:]
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islice = iarray[:]
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)
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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 any
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}
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// P is 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 barray = [5]renamedUint8{1, 2, 3, 4, 5}
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var bslice = barray[:]
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type byteStringer byte
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func (byteStringer) String() string {
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return "X"
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}
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var byteStringerSlice = []byteStringer{'h', 'e', 'l', 'l', 'o'}
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type byteFormatter byte
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func (byteFormatter) Format(f State, _ rune) {
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Fprint(f, "X")
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}
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var byteFormatterSlice = []byteFormatter{'h', 'e', 'l', 'l', 'o'}
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type writeStringFormatter string
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func (sf writeStringFormatter) Format(f State, c rune) {
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if sw, ok := f.(io.StringWriter); ok {
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sw.WriteString("***" + string(sf) + "***")
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}
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}
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var fmtTests = []struct {
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fmt string
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val any
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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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{"%q", "abc", `"abc"`},
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{"%x", "abc", "616263"},
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{"%x", "\xff\xf0\x0f\xff", "fff00fff"},
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{"%X", "\xff\xf0\x0f\xff", "FFF00FFF"},
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{"%x", "", ""},
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{"% x", "", ""},
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{"%#x", "", ""},
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{"%# x", "", ""},
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{"%x", "xyz", "78797a"},
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{"%X", "xyz", "78797A"},
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{"% x", "xyz", "78 79 7a"},
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{"% X", "xyz", "78 79 7A"},
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{"%#x", "xyz", "0x78797a"},
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{"%#X", "xyz", "0X78797A"},
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{"%# x", "xyz", "0x78 0x79 0x7a"},
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{"%# X", "xyz", "0X78 0X79 0X7A"},
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// basic bytes
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{"%s", []byte("abc"), "abc"},
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{"%s", [3]byte{'a', 'b', 'c'}, "abc"},
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{"%s", &[3]byte{'a', 'b', 'c'}, "&abc"},
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{"%q", []byte("abc"), `"abc"`},
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{"%x", []byte("abc"), "616263"},
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{"%x", []byte("\xff\xf0\x0f\xff"), "fff00fff"},
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{"%X", []byte("\xff\xf0\x0f\xff"), "FFF00FFF"},
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{"%x", []byte(""), ""},
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{"% x", []byte(""), ""},
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{"%#x", []byte(""), ""},
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{"%# x", []byte(""), ""},
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{"%x", []byte("xyz"), "78797a"},
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{"%X", []byte("xyz"), "78797A"},
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{"% x", []byte("xyz"), "78 79 7a"},
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{"% X", []byte("xyz"), "78 79 7A"},
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{"%#x", []byte("xyz"), "0x78797a"},
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{"%#X", []byte("xyz"), "0X78797A"},
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{"%# x", []byte("xyz"), "0x78 0x79 0x7a"},
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{"%# X", []byte("xyz"), "0X78 0X79 0X7A"},
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// escaped strings
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{"%q", "", `""`},
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{"%#q", "", "``"},
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{"%q", "\"", `"\""`},
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{"%#q", "\"", "`\"`"},
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{"%q", "`", `"` + "`" + `"`},
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{"%#q", "`", `"` + "`" + `"`},
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{"%q", "\n", `"\n"`},
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{"%#q", "\n", `"\n"`},
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{"%q", `\n`, `"\\n"`},
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{"%#q", `\n`, "`\\n`"},
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{"%q", "abc", `"abc"`},
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{"%#q", "abc", "`abc`"},
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{"%q", "日本語", `"日本語"`},
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{"%+q", "日本語", `"\u65e5\u672c\u8a9e"`},
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{"%#q", "日本語", "`日本語`"},
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{"%#+q", "日本語", "`日本語`"},
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{"%q", "\a\b\f\n\r\t\v\"\\", `"\a\b\f\n\r\t\v\"\\"`},
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{"%+q", "\a\b\f\n\r\t\v\"\\", `"\a\b\f\n\r\t\v\"\\"`},
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{"%#q", "\a\b\f\n\r\t\v\"\\", `"\a\b\f\n\r\t\v\"\\"`},
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{"%#+q", "\a\b\f\n\r\t\v\"\\", `"\a\b\f\n\r\t\v\"\\"`},
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{"%q", "☺", `"☺"`},
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{"% q", "☺", `"☺"`}, // The space modifier should have no effect.
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{"%+q", "☺", `"\u263a"`},
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{"%#q", "☺", "`☺`"},
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{"%#+q", "☺", "`☺`"},
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{"%10q", "⌘", ` "⌘"`},
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{"%+10q", "⌘", ` "\u2318"`},
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{"%-10q", "⌘", `"⌘" `},
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{"%+-10q", "⌘", `"\u2318" `},
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{"%010q", "⌘", `0000000"⌘"`},
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{"%+010q", "⌘", `00"\u2318"`},
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{"%-010q", "⌘", `"⌘" `}, // 0 has no effect when - is present.
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{"%+-010q", "⌘", `"\u2318" `},
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{"%#8q", "\n", ` "\n"`},
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{"%#+8q", "\r", ` "\r"`},
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{"%#-8q", "\t", "` ` "},
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{"%#+-8q", "\b", `"\b" `},
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{"%q", "abc\xffdef", `"abc\xffdef"`},
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{"%+q", "abc\xffdef", `"abc\xffdef"`},
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{"%#q", "abc\xffdef", `"abc\xffdef"`},
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{"%#+q", "abc\xffdef", `"abc\xffdef"`},
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// Runes that are not printable.
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{"%q", "\U0010ffff", `"\U0010ffff"`},
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{"%+q", "\U0010ffff", `"\U0010ffff"`},
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{"%#q", "\U0010ffff", "``"},
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{"%#+q", "\U0010ffff", "``"},
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// Runes that are not valid.
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{"%q", string(rune(0x110000)), `"<22>"`},
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{"%+q", string(rune(0x110000)), `"\ufffd"`},
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{"%#q", string(rune(0x110000)), "`<60>`"},
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{"%#+q", string(rune(0x110000)), "`<60>`"},
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// characters
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{"%c", uint('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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{"%.0c", '⌘', "⌘"}, // Specifying precision should have no effect.
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{"%3c", '⌘', " ⌘"},
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{"%-3c", '⌘', "⌘ "},
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{"%c", uint64(0x100000000), "\ufffd"},
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// Runes that are not printable.
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{"%c", '\U00000e00', "\u0e00"},
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{"%c", '\U0010ffff', "\U0010ffff"},
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// Runes that are not valid.
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{"%c", -1, "<22>"},
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{"%c", 0xDC80, "<22>"},
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{"%c", rune(0x110000), "<22>"},
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{"%c", int64(0xFFFFFFFFF), "<22>"},
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{"%c", uint64(0xFFFFFFFFF), "<22>"},
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// escaped characters
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{"%q", uint(0), `'\x00'`},
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{"%+q", uint(0), `'\x00'`},
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{"%q", '"', `'"'`},
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{"%+q", '"', `'"'`},
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{"%q", '\'', `'\''`},
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{"%+q", '\'', `'\''`},
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{"%q", '`', "'`'"},
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{"%+q", '`', "'`'"},
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{"%q", 'x', `'x'`},
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{"%+q", 'x', `'x'`},
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{"%q", 'ÿ', `'ÿ'`},
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{"%+q", 'ÿ', `'\u00ff'`},
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{"%q", '\n', `'\n'`},
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{"%+q", '\n', `'\n'`},
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{"%q", '☺', `'☺'`},
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{"%+q", '☺', `'\u263a'`},
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{"% q", '☺', `'☺'`}, // The space modifier should have no effect.
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{"%.0q", '☺', `'☺'`}, // Specifying precision should have no effect.
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{"%10q", '⌘', ` '⌘'`},
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{"%+10q", '⌘', ` '\u2318'`},
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{"%-10q", '⌘', `'⌘' `},
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{"%+-10q", '⌘', `'\u2318' `},
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{"%010q", '⌘', `0000000'⌘'`},
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{"%+010q", '⌘', `00'\u2318'`},
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{"%-010q", '⌘', `'⌘' `}, // 0 has no effect when - is present.
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{"%+-010q", '⌘', `'\u2318' `},
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// Runes that are not printable.
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{"%q", '\U00000e00', `'\u0e00'`},
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{"%q", '\U0010ffff', `'\U0010ffff'`},
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// Runes that are not valid.
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{"%q", int32(-1), `'<27>'`},
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{"%q", 0xDC80, `'<27>'`},
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{"%q", rune(0x110000), `'<27>'`},
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{"%q", int64(0xFFFFFFFFF), `'<27>'`},
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{"%q", uint64(0xFFFFFFFFF), `'<27>'`},
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// width
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{"%5s", "abc", " abc"},
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{"%5s", []byte("abc"), " abc"},
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{"%2s", "\u263a", " ☺"},
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{"%2s", []byte("\u263a"), " ☺"},
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{"%-5s", "abc", "abc "},
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{"%-5s", []byte("abc"), "abc "},
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{"%05s", "abc", "00abc"},
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{"%05s", []byte("abc"), "00abc"},
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{"%5s", "abcdefghijklmnopqrstuvwxyz", "abcdefghijklmnopqrstuvwxyz"},
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{"%5s", []byte("abcdefghijklmnopqrstuvwxyz"), "abcdefghijklmnopqrstuvwxyz"},
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{"%.5s", "abcdefghijklmnopqrstuvwxyz", "abcde"},
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{"%.5s", []byte("abcdefghijklmnopqrstuvwxyz"), "abcde"},
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{"%.0s", "日本語日本語", ""},
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{"%.0s", []byte("日本語日本語"), ""},
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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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{"%.10s", "日本語日本語", "日本語日本語"},
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{"%.10s", []byte("日本語日本語"), "日本語日本語"},
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{"%08q", "abc", `000"abc"`},
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{"%08q", []byte("abc"), `000"abc"`},
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{"%-8q", "abc", `"abc" `},
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{"%-8q", []byte("abc"), `"abc" `},
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{"%.5q", "abcdefghijklmnopqrstuvwxyz", `"abcde"`},
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{"%.5q", []byte("abcdefghijklmnopqrstuvwxyz"), `"abcde"`},
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{"%.5x", "abcdefghijklmnopqrstuvwxyz", "6162636465"},
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{"%.5x", []byte("abcdefghijklmnopqrstuvwxyz"), "6162636465"},
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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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{"%.1q", "日本語", `"日"`},
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{"%.1q", []byte("日本語"), `"日"`},
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{"%.1x", "日本語", "e6"},
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{"%.1X", []byte("日本語"), "E6"},
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{"%10.1q", "日本語日本語", ` "日"`},
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{"%10.1q", []byte("日本語日本語"), ` "日"`},
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{"%10v", nil, " <nil>"},
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{"%-10v", nil, "<nil> "},
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// integers
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{"%d", uint(12345), "12345"},
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{"%d", int(-12345), "-12345"},
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{"%d", ^uint8(0), "255"},
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{"%d", ^uint16(0), "65535"},
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{"%d", ^uint32(0), "4294967295"},
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{"%d", ^uint64(0), "18446744073709551615"},
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{"%d", int8(-1 << 7), "-128"},
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{"%d", int16(-1 << 15), "-32768"},
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{"%d", int32(-1 << 31), "-2147483648"},
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{"%d", int64(-1 << 63), "-9223372036854775808"},
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{"%.d", 0, ""},
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{"%.0d", 0, ""},
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{"%6.0d", 0, " "},
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{"%06.0d", 0, " "},
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{"% d", 12345, " 12345"},
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{"%+d", 12345, "+12345"},
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{"%+d", -12345, "-12345"},
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{"%b", 7, "111"},
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{"%b", -6, "-110"},
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{"%#b", 7, "0b111"},
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{"%#b", -6, "-0b110"},
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{"%b", ^uint32(0), "11111111111111111111111111111111"},
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{"%b", ^uint64(0), "1111111111111111111111111111111111111111111111111111111111111111"},
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{"%b", int64(-1 << 63), zeroFill("-1", 63, "")},
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{"%o", 01234, "1234"},
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{"%o", -01234, "-1234"},
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{"%#o", 01234, "01234"},
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{"%#o", -01234, "-01234"},
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{"%O", 01234, "0o1234"},
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{"%O", -01234, "-0o1234"},
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{"%o", ^uint32(0), "37777777777"},
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{"%o", ^uint64(0), "1777777777777777777777"},
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{"%#X", 0, "0X0"},
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{"%x", 0x12abcdef, "12abcdef"},
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{"%X", 0x12abcdef, "12ABCDEF"},
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{"%x", ^uint32(0), "ffffffff"},
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{"%X", ^uint64(0), "FFFFFFFFFFFFFFFF"},
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{"%.20b", 7, "00000000000000000111"},
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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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{"%20.8d", 1234, " 00001234"},
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{"%20.8d", -1234, " -00001234"},
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{"%020.8d", 1234, " 00001234"},
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{"%020.8d", -1234, " -00001234"},
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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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// Test correct f.intbuf overflow checks.
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{"%068d", 1, zeroFill("", 68, "1")},
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{"%068d", -1, zeroFill("-", 67, "1")},
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{"%#.68x", 42, zeroFill("0x", 68, "2a")},
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{"%.68d", -42, zeroFill("-", 68, "42")},
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{"%+.68d", 42, zeroFill("+", 68, "42")},
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{"% .68d", 42, zeroFill(" ", 68, "42")},
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{"% +.68d", 42, zeroFill("+", 68, "42")},
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// unicode format
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{"%U", 0, "U+0000"},
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{"%U", -1, "U+FFFFFFFFFFFFFFFF"},
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{"%U", '\n', `U+000A`},
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{"%#U", '\n', `U+000A`},
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{"%+U", 'x', `U+0078`}, // Plus flag should have no effect.
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{"%# U", 'x', `U+0078 'x'`}, // Space flag should have no effect.
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{"%#.2U", 'x', `U+0078 'x'`}, // Precisions below 4 should print 4 digits.
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{"%U", '\u263a', `U+263A`},
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{"%#U", '\u263a', `U+263A '☺'`},
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{"%U", '\U0001D6C2', `U+1D6C2`},
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{"%#U", '\U0001D6C2', `U+1D6C2 '𝛂'`},
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{"%#14.6U", '⌘', " U+002318 '⌘'"},
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{"%#-14.6U", '⌘', "U+002318 '⌘' "},
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{"%#014.6U", '⌘', " U+002318 '⌘'"},
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{"%#-014.6U", '⌘', "U+002318 '⌘' "},
|
||
{"%.68U", uint(42), zeroFill("U+", 68, "2A")},
|
||
{"%#.68U", '日', zeroFill("U+", 68, "65E5") + " '日'"},
|
||
|
||
// floats
|
||
{"%+.3e", 0.0, "+0.000e+00"},
|
||
{"%+.3e", 1.0, "+1.000e+00"},
|
||
{"%+.3x", 0.0, "+0x0.000p+00"},
|
||
{"%+.3x", 1.0, "+0x1.000p+00"},
|
||
{"%+.3f", -1.0, "-1.000"},
|
||
{"%+.3F", -1.0, "-1.000"},
|
||
{"%+.3F", float32(-1.0), "-1.000"},
|
||
{"%+07.2f", 1.0, "+001.00"},
|
||
{"%+07.2f", -1.0, "-001.00"},
|
||
{"%-07.2f", 1.0, "1.00 "},
|
||
{"%-07.2f", -1.0, "-1.00 "},
|
||
{"%+-07.2f", 1.0, "+1.00 "},
|
||
{"%+-07.2f", -1.0, "-1.00 "},
|
||
{"%-+07.2f", 1.0, "+1.00 "},
|
||
{"%-+07.2f", -1.0, "-1.00 "},
|
||
{"%+10.2f", +1.0, " +1.00"},
|
||
{"%+10.2f", -1.0, " -1.00"},
|
||
{"% .3E", -1.0, "-1.000E+00"},
|
||
{"% .3e", 1.0, " 1.000e+00"},
|
||
{"% .3X", -1.0, "-0X1.000P+00"},
|
||
{"% .3x", 1.0, " 0x1.000p+00"},
|
||
{"%+.3g", 0.0, "+0"},
|
||
{"%+.3g", 1.0, "+1"},
|
||
{"%+.3g", -1.0, "-1"},
|
||
{"% .3g", -1.0, "-1"},
|
||
{"% .3g", 1.0, " 1"},
|
||
{"%b", float32(1.0), "8388608p-23"},
|
||
{"%b", 1.0, "4503599627370496p-52"},
|
||
// Test sharp flag used with floats.
|
||
{"%#g", 1e-323, "1.00000e-323"},
|
||
{"%#g", -1.0, "-1.00000"},
|
||
{"%#g", 1.1, "1.10000"},
|
||
{"%#g", 123456.0, "123456."},
|
||
{"%#g", 1234567.0, "1.234567e+06"},
|
||
{"%#g", 1230000.0, "1.23000e+06"},
|
||
{"%#g", 1000000.0, "1.00000e+06"},
|
||
{"%#.0f", 1.0, "1."},
|
||
{"%#.0e", 1.0, "1.e+00"},
|
||
{"%#.0x", 1.0, "0x1.p+00"},
|
||
{"%#.0g", 1.0, "1."},
|
||
{"%#.0g", 1100000.0, "1.e+06"},
|
||
{"%#.4f", 1.0, "1.0000"},
|
||
{"%#.4e", 1.0, "1.0000e+00"},
|
||
{"%#.4x", 1.0, "0x1.0000p+00"},
|
||
{"%#.4g", 1.0, "1.000"},
|
||
{"%#.4g", 100000.0, "1.000e+05"},
|
||
{"%#.4g", 1.234, "1.234"},
|
||
{"%#.4g", 0.1234, "0.1234"},
|
||
{"%#.4g", 1.23, "1.230"},
|
||
{"%#.4g", 0.123, "0.1230"},
|
||
{"%#.4g", 1.2, "1.200"},
|
||
{"%#.4g", 0.12, "0.1200"},
|
||
{"%#.4g", 10.2, "10.20"},
|
||
{"%#.4g", 0.0, "0.000"},
|
||
{"%#.4g", 0.012, "0.01200"},
|
||
{"%#.0f", 123.0, "123."},
|
||
{"%#.0e", 123.0, "1.e+02"},
|
||
{"%#.0x", 123.0, "0x1.p+07"},
|
||
{"%#.0g", 123.0, "1.e+02"},
|
||
{"%#.4f", 123.0, "123.0000"},
|
||
{"%#.4e", 123.0, "1.2300e+02"},
|
||
{"%#.4x", 123.0, "0x1.ec00p+06"},
|
||
{"%#.4g", 123.0, "123.0"},
|
||
{"%#.4g", 123000.0, "1.230e+05"},
|
||
{"%#9.4g", 1.0, " 1.000"},
|
||
// The sharp flag has no effect for binary float format.
|
||
{"%#b", 1.0, "4503599627370496p-52"},
|
||
// Precision has no effect for binary float format.
|
||
{"%.4b", float32(1.0), "8388608p-23"},
|
||
{"%.4b", -1.0, "-4503599627370496p-52"},
|
||
// Test correct f.intbuf boundary checks.
|
||
{"%.68f", 1.0, zeroFill("1.", 68, "")},
|
||
{"%.68f", -1.0, zeroFill("-1.", 68, "")},
|
||
// float infinites and NaNs
|
||
{"%f", posInf, "+Inf"},
|
||
{"%.1f", negInf, "-Inf"},
|
||
{"% f", NaN, " NaN"},
|
||
{"%20f", posInf, " +Inf"},
|
||
{"% 20F", posInf, " Inf"},
|
||
{"% 20e", negInf, " -Inf"},
|
||
{"% 20x", negInf, " -Inf"},
|
||
{"%+20E", negInf, " -Inf"},
|
||
{"%+20X", negInf, " -Inf"},
|
||
{"% +20g", negInf, " -Inf"},
|
||
{"%+-20G", posInf, "+Inf "},
|
||
{"%20e", NaN, " NaN"},
|
||
{"%20x", NaN, " NaN"},
|
||
{"% +20E", NaN, " +NaN"},
|
||
{"% +20X", NaN, " +NaN"},
|
||
{"% -20g", NaN, " NaN "},
|
||
{"%+-20G", NaN, "+NaN "},
|
||
// Zero padding does not apply to infinities and NaN.
|
||
{"%+020e", posInf, " +Inf"},
|
||
{"%+020x", posInf, " +Inf"},
|
||
{"%-020f", negInf, "-Inf "},
|
||
{"%-020E", NaN, "NaN "},
|
||
{"%-020X", NaN, "NaN "},
|
||
|
||
// complex values
|
||
{"%.f", 0i, "(0+0i)"},
|
||
{"% .f", 0i, "( 0+0i)"},
|
||
{"%+.f", 0i, "(+0+0i)"},
|
||
{"% +.f", 0i, "(+0+0i)"},
|
||
{"%+.3e", 0i, "(+0.000e+00+0.000e+00i)"},
|
||
{"%+.3x", 0i, "(+0x0.000p+00+0x0.000p+00i)"},
|
||
{"%+.3f", 0i, "(+0.000+0.000i)"},
|
||
{"%+.3g", 0i, "(+0+0i)"},
|
||
{"%+.3e", 1 + 2i, "(+1.000e+00+2.000e+00i)"},
|
||
{"%+.3x", 1 + 2i, "(+0x1.000p+00+0x1.000p+01i)"},
|
||
{"%+.3f", 1 + 2i, "(+1.000+2.000i)"},
|
||
{"%+.3g", 1 + 2i, "(+1+2i)"},
|
||
{"%.3e", 0i, "(0.000e+00+0.000e+00i)"},
|
||
{"%.3x", 0i, "(0x0.000p+00+0x0.000p+00i)"},
|
||
{"%.3f", 0i, "(0.000+0.000i)"},
|
||
{"%.3F", 0i, "(0.000+0.000i)"},
|
||
{"%.3F", complex64(0i), "(0.000+0.000i)"},
|
||
{"%.3g", 0i, "(0+0i)"},
|
||
{"%.3e", 1 + 2i, "(1.000e+00+2.000e+00i)"},
|
||
{"%.3x", 1 + 2i, "(0x1.000p+00+0x1.000p+01i)"},
|
||
{"%.3f", 1 + 2i, "(1.000+2.000i)"},
|
||
{"%.3g", 1 + 2i, "(1+2i)"},
|
||
{"%.3e", -1 - 2i, "(-1.000e+00-2.000e+00i)"},
|
||
{"%.3x", -1 - 2i, "(-0x1.000p+00-0x1.000p+01i)"},
|
||
{"%.3f", -1 - 2i, "(-1.000-2.000i)"},
|
||
{"%.3g", -1 - 2i, "(-1-2i)"},
|
||
{"% .3E", -1 - 2i, "(-1.000E+00-2.000E+00i)"},
|
||
{"% .3X", -1 - 2i, "(-0X1.000P+00-0X1.000P+01i)"},
|
||
{"%+.3g", 1 + 2i, "(+1+2i)"},
|
||
{"%+.3g", complex64(1 + 2i), "(+1+2i)"},
|
||
{"%#g", 1 + 2i, "(1.00000+2.00000i)"},
|
||
{"%#g", 123456 + 789012i, "(123456.+789012.i)"},
|
||
{"%#g", 1e-10i, "(0.00000+1.00000e-10i)"},
|
||
{"%#g", -1e10 - 1.11e100i, "(-1.00000e+10-1.11000e+100i)"},
|
||
{"%#.0f", 1.23 + 1.0i, "(1.+1.i)"},
|
||
{"%#.0e", 1.23 + 1.0i, "(1.e+00+1.e+00i)"},
|
||
{"%#.0x", 1.23 + 1.0i, "(0x1.p+00+0x1.p+00i)"},
|
||
{"%#.0g", 1.23 + 1.0i, "(1.+1.i)"},
|
||
{"%#.0g", 0 + 100000i, "(0.+1.e+05i)"},
|
||
{"%#.0g", 1230000 + 0i, "(1.e+06+0.i)"},
|
||
{"%#.4f", 1 + 1.23i, "(1.0000+1.2300i)"},
|
||
{"%#.4e", 123 + 1i, "(1.2300e+02+1.0000e+00i)"},
|
||
{"%#.4x", 123 + 1i, "(0x1.ec00p+06+0x1.0000p+00i)"},
|
||
{"%#.4g", 123 + 1.23i, "(123.0+1.230i)"},
|
||
{"%#12.5g", 0 + 100000i, "( 0.0000 +1.0000e+05i)"},
|
||
{"%#12.5g", 1230000 - 0i, "( 1.2300e+06 +0.0000i)"},
|
||
{"%b", 1 + 2i, "(4503599627370496p-52+4503599627370496p-51i)"},
|
||
{"%b", complex64(1 + 2i), "(8388608p-23+8388608p-22i)"},
|
||
// The sharp flag has no effect for binary complex format.
|
||
{"%#b", 1 + 2i, "(4503599627370496p-52+4503599627370496p-51i)"},
|
||
// Precision has no effect for binary complex format.
|
||
{"%.4b", 1 + 2i, "(4503599627370496p-52+4503599627370496p-51i)"},
|
||
{"%.4b", complex64(1 + 2i), "(8388608p-23+8388608p-22i)"},
|
||
// complex infinites and NaNs
|
||
{"%f", complex(posInf, posInf), "(+Inf+Infi)"},
|
||
{"%f", complex(negInf, negInf), "(-Inf-Infi)"},
|
||
{"%f", complex(NaN, NaN), "(NaN+NaNi)"},
|
||
{"%.1f", complex(posInf, posInf), "(+Inf+Infi)"},
|
||
{"% f", complex(posInf, posInf), "( Inf+Infi)"},
|
||
{"% f", complex(negInf, negInf), "(-Inf-Infi)"},
|
||
{"% f", complex(NaN, NaN), "( NaN+NaNi)"},
|
||
{"%8e", complex(posInf, posInf), "( +Inf +Infi)"},
|
||
{"%8x", complex(posInf, posInf), "( +Inf +Infi)"},
|
||
{"% 8E", complex(posInf, posInf), "( Inf +Infi)"},
|
||
{"% 8X", complex(posInf, posInf), "( Inf +Infi)"},
|
||
{"%+8f", complex(negInf, negInf), "( -Inf -Infi)"},
|
||
{"% +8g", complex(negInf, negInf), "( -Inf -Infi)"},
|
||
{"% -8G", complex(NaN, NaN), "( NaN +NaN i)"},
|
||
{"%+-8b", complex(NaN, NaN), "(+NaN +NaN i)"},
|
||
// Zero padding does not apply to infinities and NaN.
|
||
{"%08f", complex(posInf, posInf), "( +Inf +Infi)"},
|
||
{"%-08g", complex(negInf, negInf), "(-Inf -Inf i)"},
|
||
{"%-08G", complex(NaN, NaN), "(NaN +NaN i)"},
|
||
|
||
// old test/fmt_test.go
|
||
{"%e", 1.0, "1.000000e+00"},
|
||
{"%e", 1234.5678e3, "1.234568e+06"},
|
||
{"%e", 1234.5678e-8, "1.234568e-05"},
|
||
{"%e", -7.0, "-7.000000e+00"},
|
||
{"%e", -1e-9, "-1.000000e-09"},
|
||
{"%f", 1234.5678e3, "1234567.800000"},
|
||
{"%f", 1234.5678e-8, "0.000012"},
|
||
{"%f", -7.0, "-7.000000"},
|
||
{"%f", -1e-9, "-0.000000"},
|
||
{"%g", 1234.5678e3, "1.2345678e+06"},
|
||
{"%g", float32(1234.5678e3), "1.2345678e+06"},
|
||
{"%g", 1234.5678e-8, "1.2345678e-05"},
|
||
{"%g", -7.0, "-7"},
|
||
{"%g", -1e-9, "-1e-09"},
|
||
{"%g", float32(-1e-9), "-1e-09"},
|
||
{"%E", 1.0, "1.000000E+00"},
|
||
{"%E", 1234.5678e3, "1.234568E+06"},
|
||
{"%E", 1234.5678e-8, "1.234568E-05"},
|
||
{"%E", -7.0, "-7.000000E+00"},
|
||
{"%E", -1e-9, "-1.000000E-09"},
|
||
{"%G", 1234.5678e3, "1.2345678E+06"},
|
||
{"%G", float32(1234.5678e3), "1.2345678E+06"},
|
||
{"%G", 1234.5678e-8, "1.2345678E-05"},
|
||
{"%G", -7.0, "-7"},
|
||
{"%G", -1e-9, "-1E-09"},
|
||
{"%G", float32(-1e-9), "-1E-09"},
|
||
{"%20.5s", "qwertyuiop", " qwert"},
|
||
{"%.5s", "qwertyuiop", "qwert"},
|
||
{"%-20.5s", "qwertyuiop", "qwert "},
|
||
{"%20c", 'x', " x"},
|
||
{"%-20c", 'x', "x "},
|
||
{"%20.6e", 1.2345e3, " 1.234500e+03"},
|
||
{"%20.6e", 1.2345e-3, " 1.234500e-03"},
|
||
{"%20e", 1.2345e3, " 1.234500e+03"},
|
||
{"%20e", 1.2345e-3, " 1.234500e-03"},
|
||
{"%20.8e", 1.2345e3, " 1.23450000e+03"},
|
||
{"%20f", 1.23456789e3, " 1234.567890"},
|
||
{"%20f", 1.23456789e-3, " 0.001235"},
|
||
{"%20f", 12345678901.23456789, " 12345678901.234568"},
|
||
{"%-20f", 1.23456789e3, "1234.567890 "},
|
||
{"%20.8f", 1.23456789e3, " 1234.56789000"},
|
||
{"%20.8f", 1.23456789e-3, " 0.00123457"},
|
||
{"%g", 1.23456789e3, "1234.56789"},
|
||
{"%g", 1.23456789e-3, "0.00123456789"},
|
||
{"%g", 1.23456789e20, "1.23456789e+20"},
|
||
|
||
// arrays
|
||
{"%v", array, "[1 2 3 4 5]"},
|
||
{"%v", iarray, "[1 hello 2.5 <nil>]"},
|
||
{"%v", barray, "[1 2 3 4 5]"},
|
||
{"%v", &array, "&[1 2 3 4 5]"},
|
||
{"%v", &iarray, "&[1 hello 2.5 <nil>]"},
|
||
{"%v", &barray, "&[1 2 3 4 5]"},
|
||
|
||
// slices
|
||
{"%v", slice, "[1 2 3 4 5]"},
|
||
{"%v", islice, "[1 hello 2.5 <nil>]"},
|
||
{"%v", bslice, "[1 2 3 4 5]"},
|
||
{"%v", &slice, "&[1 2 3 4 5]"},
|
||
{"%v", &islice, "&[1 hello 2.5 <nil>]"},
|
||
{"%v", &bslice, "&[1 2 3 4 5]"},
|
||
|
||
// byte arrays and slices with %b,%c,%d,%o,%U and %v
|
||
{"%b", [3]byte{65, 66, 67}, "[1000001 1000010 1000011]"},
|
||
{"%c", [3]byte{65, 66, 67}, "[A B C]"},
|
||
{"%d", [3]byte{65, 66, 67}, "[65 66 67]"},
|
||
{"%o", [3]byte{65, 66, 67}, "[101 102 103]"},
|
||
{"%U", [3]byte{65, 66, 67}, "[U+0041 U+0042 U+0043]"},
|
||
{"%v", [3]byte{65, 66, 67}, "[65 66 67]"},
|
||
{"%v", [1]byte{123}, "[123]"},
|
||
{"%012v", []byte{}, "[]"},
|
||
{"%#012v", []byte{}, "[]byte{}"},
|
||
{"%6v", []byte{1, 11, 111}, "[ 1 11 111]"},
|
||
{"%06v", []byte{1, 11, 111}, "[000001 000011 000111]"},
|
||
{"%-6v", []byte{1, 11, 111}, "[1 11 111 ]"},
|
||
{"%-06v", []byte{1, 11, 111}, "[1 11 111 ]"},
|
||
{"%#v", []byte{1, 11, 111}, "[]byte{0x1, 0xb, 0x6f}"},
|
||
{"%#6v", []byte{1, 11, 111}, "[]byte{ 0x1, 0xb, 0x6f}"},
|
||
{"%#06v", []byte{1, 11, 111}, "[]byte{0x000001, 0x00000b, 0x00006f}"},
|
||
{"%#-6v", []byte{1, 11, 111}, "[]byte{0x1 , 0xb , 0x6f }"},
|
||
{"%#-06v", []byte{1, 11, 111}, "[]byte{0x1 , 0xb , 0x6f }"},
|
||
// f.space should and f.plus should not have an effect with %v.
|
||
{"% v", []byte{1, 11, 111}, "[ 1 11 111]"},
|
||
{"%+v", [3]byte{1, 11, 111}, "[1 11 111]"},
|
||
{"%# -6v", []byte{1, 11, 111}, "[]byte{ 0x1 , 0xb , 0x6f }"},
|
||
{"%#+-6v", [3]byte{1, 11, 111}, "[3]uint8{0x1 , 0xb , 0x6f }"},
|
||
// f.space and f.plus should have an effect with %d.
|
||
{"% d", []byte{1, 11, 111}, "[ 1 11 111]"},
|
||
{"%+d", [3]byte{1, 11, 111}, "[+1 +11 +111]"},
|
||
{"%# -6d", []byte{1, 11, 111}, "[ 1 11 111 ]"},
|
||
{"%#+-6d", [3]byte{1, 11, 111}, "[+1 +11 +111 ]"},
|
||
|
||
// floates with %v
|
||
{"%v", 1.2345678, "1.2345678"},
|
||
{"%v", float32(1.2345678), "1.2345678"},
|
||
|
||
// complexes with %v
|
||
{"%v", 1 + 2i, "(1+2i)"},
|
||
{"%v", complex64(1 + 2i), "(1+2i)"},
|
||
|
||
// structs
|
||
{"%v", A{1, 2, "a", []int{1, 2}}, `{1 2 a [1 2]}`},
|
||
{"%+v", A{1, 2, "a", []int{1, 2}}, `{i:1 j:2 s:a x:[1 2]}`},
|
||
|
||
// +v on structs with Stringable items
|
||
{"%+v", B{1, 2}, `{I:<1> j:2}`},
|
||
{"%+v", C{1, B{2, 3}}, `{i:1 B:{I:<2> j:3}}`},
|
||
|
||
// other formats on Stringable items
|
||
{"%s", I(23), `<23>`},
|
||
{"%q", I(23), `"<23>"`},
|
||
{"%x", I(23), `3c32333e`},
|
||
{"%#x", I(23), `0x3c32333e`},
|
||
{"%# x", I(23), `0x3c 0x32 0x33 0x3e`},
|
||
// Stringer applies only to string formats.
|
||
{"%d", I(23), `23`},
|
||
// Stringer applies to the extracted value.
|
||
{"%s", reflect.ValueOf(I(23)), `<23>`},
|
||
|
||
// go syntax
|
||
{"%#v", A{1, 2, "a", []int{1, 2}}, `fmt_test.A{i:1, j:0x2, s:"a", x:[]int{1, 2}}`},
|
||
{"%#v", new(byte), "(*uint8)(0xPTR)"},
|
||
{"%#v", TestFmtInterface, "(func(*testing.T))(0xPTR)"},
|
||
{"%#v", make(chan int), "(chan int)(0xPTR)"},
|
||
{"%#v", uint64(1<<64 - 1), "0xffffffffffffffff"},
|
||
{"%#v", 1000000000, "1000000000"},
|
||
{"%#v", map[string]int{"a": 1}, `map[string]int{"a":1}`},
|
||
{"%#v", map[string]B{"a": {1, 2}}, `map[string]fmt_test.B{"a":fmt_test.B{I:1, j:2}}`},
|
||
{"%#v", []string{"a", "b"}, `[]string{"a", "b"}`},
|
||
{"%#v", SI{}, `fmt_test.SI{I:interface {}(nil)}`},
|
||
{"%#v", []int(nil), `[]int(nil)`},
|
||
{"%#v", []int{}, `[]int{}`},
|
||
{"%#v", array, `[5]int{1, 2, 3, 4, 5}`},
|
||
{"%#v", &array, `&[5]int{1, 2, 3, 4, 5}`},
|
||
{"%#v", iarray, `[4]interface {}{1, "hello", 2.5, interface {}(nil)}`},
|
||
{"%#v", &iarray, `&[4]interface {}{1, "hello", 2.5, interface {}(nil)}`},
|
||
{"%#v", map[int]byte(nil), `map[int]uint8(nil)`},
|
||
{"%#v", map[int]byte{}, `map[int]uint8{}`},
|
||
{"%#v", "foo", `"foo"`},
|
||
{"%#v", barray, `[5]fmt_test.renamedUint8{0x1, 0x2, 0x3, 0x4, 0x5}`},
|
||
{"%#v", bslice, `[]fmt_test.renamedUint8{0x1, 0x2, 0x3, 0x4, 0x5}`},
|
||
{"%#v", []int32(nil), "[]int32(nil)"},
|
||
{"%#v", 1.2345678, "1.2345678"},
|
||
{"%#v", float32(1.2345678), "1.2345678"},
|
||
|
||
// Whole number floats are printed without decimals. See Issue 27634.
|
||
{"%#v", 1.0, "1"},
|
||
{"%#v", 1000000.0, "1e+06"},
|
||
{"%#v", float32(1.0), "1"},
|
||
{"%#v", float32(1000000.0), "1e+06"},
|
||
|
||
// Only print []byte and []uint8 as type []byte if they appear at the top level.
|
||
{"%#v", []byte(nil), "[]byte(nil)"},
|
||
{"%#v", []uint8(nil), "[]byte(nil)"},
|
||
{"%#v", []byte{}, "[]byte{}"},
|
||
{"%#v", []uint8{}, "[]byte{}"},
|
||
{"%#v", reflect.ValueOf([]byte{}), "[]uint8{}"},
|
||
{"%#v", reflect.ValueOf([]uint8{}), "[]uint8{}"},
|
||
{"%#v", &[]byte{}, "&[]uint8{}"},
|
||
{"%#v", &[]byte{}, "&[]uint8{}"},
|
||
{"%#v", [3]byte{}, "[3]uint8{0x0, 0x0, 0x0}"},
|
||
{"%#v", [3]uint8{}, "[3]uint8{0x0, 0x0, 0x0}"},
|
||
|
||
// slices with other formats
|
||
{"%#x", []int{1, 2, 15}, `[0x1 0x2 0xf]`},
|
||
{"%x", []int{1, 2, 15}, `[1 2 f]`},
|
||
{"%d", []int{1, 2, 15}, `[1 2 15]`},
|
||
{"%d", []byte{1, 2, 15}, `[1 2 15]`},
|
||
{"%q", []string{"a", "b"}, `["a" "b"]`},
|
||
{"% 02x", []byte{1}, "01"},
|
||
{"% 02x", []byte{1, 2, 3}, "01 02 03"},
|
||
|
||
// Padding with byte slices.
|
||
{"%2x", []byte{}, " "},
|
||
{"%#2x", []byte{}, " "},
|
||
{"% 02x", []byte{}, "00"},
|
||
{"%# 02x", []byte{}, "00"},
|
||
{"%-2x", []byte{}, " "},
|
||
{"%-02x", []byte{}, " "},
|
||
{"%8x", []byte{0xab}, " ab"},
|
||
{"% 8x", []byte{0xab}, " ab"},
|
||
{"%#8x", []byte{0xab}, " 0xab"},
|
||
{"%# 8x", []byte{0xab}, " 0xab"},
|
||
{"%08x", []byte{0xab}, "000000ab"},
|
||
{"% 08x", []byte{0xab}, "000000ab"},
|
||
{"%#08x", []byte{0xab}, "00000xab"},
|
||
{"%# 08x", []byte{0xab}, "00000xab"},
|
||
{"%10x", []byte{0xab, 0xcd}, " abcd"},
|
||
{"% 10x", []byte{0xab, 0xcd}, " ab cd"},
|
||
{"%#10x", []byte{0xab, 0xcd}, " 0xabcd"},
|
||
{"%# 10x", []byte{0xab, 0xcd}, " 0xab 0xcd"},
|
||
{"%010x", []byte{0xab, 0xcd}, "000000abcd"},
|
||
{"% 010x", []byte{0xab, 0xcd}, "00000ab cd"},
|
||
{"%#010x", []byte{0xab, 0xcd}, "00000xabcd"},
|
||
{"%# 010x", []byte{0xab, 0xcd}, "00xab 0xcd"},
|
||
{"%-10X", []byte{0xab}, "AB "},
|
||
{"% -010X", []byte{0xab}, "AB "},
|
||
{"%#-10X", []byte{0xab, 0xcd}, "0XABCD "},
|
||
{"%# -010X", []byte{0xab, 0xcd}, "0XAB 0XCD "},
|
||
// Same for strings
|
||
{"%2x", "", " "},
|
||
{"%#2x", "", " "},
|
||
{"% 02x", "", "00"},
|
||
{"%# 02x", "", "00"},
|
||
{"%-2x", "", " "},
|
||
{"%-02x", "", " "},
|
||
{"%8x", "\xab", " ab"},
|
||
{"% 8x", "\xab", " ab"},
|
||
{"%#8x", "\xab", " 0xab"},
|
||
{"%# 8x", "\xab", " 0xab"},
|
||
{"%08x", "\xab", "000000ab"},
|
||
{"% 08x", "\xab", "000000ab"},
|
||
{"%#08x", "\xab", "00000xab"},
|
||
{"%# 08x", "\xab", "00000xab"},
|
||
{"%10x", "\xab\xcd", " abcd"},
|
||
{"% 10x", "\xab\xcd", " ab cd"},
|
||
{"%#10x", "\xab\xcd", " 0xabcd"},
|
||
{"%# 10x", "\xab\xcd", " 0xab 0xcd"},
|
||
{"%010x", "\xab\xcd", "000000abcd"},
|
||
{"% 010x", "\xab\xcd", "00000ab cd"},
|
||
{"%#010x", "\xab\xcd", "00000xabcd"},
|
||
{"%# 010x", "\xab\xcd", "00xab 0xcd"},
|
||
{"%-10X", "\xab", "AB "},
|
||
{"% -010X", "\xab", "AB "},
|
||
{"%#-10X", "\xab\xcd", "0XABCD "},
|
||
{"%# -010X", "\xab\xcd", "0XAB 0XCD "},
|
||
|
||
// renamings
|
||
{"%v", renamedBool(true), "true"},
|
||
{"%d", renamedBool(true), "%!d(fmt_test.renamedBool=true)"},
|
||
{"%o", renamedInt(8), "10"},
|
||
{"%d", renamedInt8(-9), "-9"},
|
||
{"%v", renamedInt16(10), "10"},
|
||
{"%v", renamedInt32(-11), "-11"},
|
||
{"%X", renamedInt64(255), "FF"},
|
||
{"%v", renamedUint(13), "13"},
|
||
{"%o", renamedUint8(14), "16"},
|
||
{"%X", renamedUint16(15), "F"},
|
||
{"%d", renamedUint32(16), "16"},
|
||
{"%X", renamedUint64(17), "11"},
|
||
{"%o", renamedUintptr(18), "22"},
|
||
{"%x", renamedString("thing"), "7468696e67"},
|
||
{"%d", renamedBytes([]byte{1, 2, 15}), `[1 2 15]`},
|
||
{"%q", renamedBytes([]byte("hello")), `"hello"`},
|
||
{"%x", []renamedUint8{'h', 'e', 'l', 'l', 'o'}, "68656c6c6f"},
|
||
{"%X", []renamedUint8{'h', 'e', 'l', 'l', 'o'}, "68656C6C6F"},
|
||
{"%s", []renamedUint8{'h', 'e', 'l', 'l', 'o'}, "hello"},
|
||
{"%q", []renamedUint8{'h', 'e', 'l', 'l', 'o'}, `"hello"`},
|
||
{"%v", renamedFloat32(22), "22"},
|
||
{"%v", renamedFloat64(33), "33"},
|
||
{"%v", renamedComplex64(3 + 4i), "(3+4i)"},
|
||
{"%v", renamedComplex128(4 - 3i), "(4-3i)"},
|
||
|
||
// Formatter
|
||
{"%x", F(1), "<x=F(1)>"},
|
||
{"%x", G(2), "2"},
|
||
{"%+v", S{F(4), G(5)}, "{F:<v=F(4)> G:5}"},
|
||
|
||
// GoStringer
|
||
{"%#v", G(6), "GoString(6)"},
|
||
{"%#v", S{F(7), G(8)}, "fmt_test.S{F:<v=F(7)>, G:GoString(8)}"},
|
||
|
||
// %T
|
||
{"%T", byte(0), "uint8"},
|
||
{"%T", reflect.ValueOf(nil), "reflect.Value"},
|
||
{"%T", (4 - 3i), "complex128"},
|
||
{"%T", renamedComplex128(4 - 3i), "fmt_test.renamedComplex128"},
|
||
{"%T", intVar, "int"},
|
||
{"%6T", &intVar, " *int"},
|
||
{"%10T", nil, " <nil>"},
|
||
{"%-10T", nil, "<nil> "},
|
||
|
||
// %p with pointers
|
||
{"%p", (*int)(nil), "0x0"},
|
||
{"%#p", (*int)(nil), "0"},
|
||
{"%p", &intVar, "0xPTR"},
|
||
{"%#p", &intVar, "PTR"},
|
||
{"%p", &array, "0xPTR"},
|
||
{"%p", &slice, "0xPTR"},
|
||
{"%8.2p", (*int)(nil), " 0x00"},
|
||
{"%-20.16p", &intVar, "0xPTR "},
|
||
// %p on non-pointers
|
||
{"%p", make(chan int), "0xPTR"},
|
||
{"%p", make(map[int]int), "0xPTR"},
|
||
{"%p", func() {}, "0xPTR"},
|
||
{"%p", 27, "%!p(int=27)"}, // not a pointer at all
|
||
{"%p", nil, "%!p(<nil>)"}, // nil on its own has no type ...
|
||
{"%#p", nil, "%!p(<nil>)"}, // ... and hence is not a pointer type.
|
||
// pointers with specified base
|
||
{"%b", &intVar, "PTR_b"},
|
||
{"%d", &intVar, "PTR_d"},
|
||
{"%o", &intVar, "PTR_o"},
|
||
{"%x", &intVar, "PTR_x"},
|
||
{"%X", &intVar, "PTR_X"},
|
||
// %v on pointers
|
||
{"%v", nil, "<nil>"},
|
||
{"%#v", nil, "<nil>"},
|
||
{"%v", (*int)(nil), "<nil>"},
|
||
{"%#v", (*int)(nil), "(*int)(nil)"},
|
||
{"%v", &intVar, "0xPTR"},
|
||
{"%#v", &intVar, "(*int)(0xPTR)"},
|
||
{"%8.2v", (*int)(nil), " <nil>"},
|
||
{"%-20.16v", &intVar, "0xPTR "},
|
||
// string method on pointer
|
||
{"%s", &pValue, "String(p)"}, // String method...
|
||
{"%p", &pValue, "0xPTR"}, // ... is not called with %p.
|
||
|
||
// %d on Stringer should give integer if possible
|
||
{"%s", time.Time{}.Month(), "January"},
|
||
{"%d", time.Time{}.Month(), "1"},
|
||
|
||
// erroneous things
|
||
{"", nil, "%!(EXTRA <nil>)"},
|
||
{"", 2, "%!(EXTRA int=2)"},
|
||
{"no args", "hello", "no args%!(EXTRA string=hello)"},
|
||
{"%s %", "hello", "hello %!(NOVERB)"},
|
||
{"%s %.2", "hello", "hello %!(NOVERB)"},
|
||
{"%017091901790959340919092959340919017929593813360", 0, "%!(NOVERB)%!(EXTRA int=0)"},
|
||
{"%184467440737095516170v", 0, "%!(NOVERB)%!(EXTRA int=0)"},
|
||
// Extra argument errors should format without flags set.
|
||
{"%010.2", "12345", "%!(NOVERB)%!(EXTRA string=12345)"},
|
||
|
||
// Test that maps with non-reflexive keys print all keys and values.
|
||
{"%v", map[float64]int{NaN: 1, NaN: 1}, "map[NaN:1 NaN:1]"},
|
||
|
||
// Comparison of padding rules with C printf.
|
||
/*
|
||
C program:
|
||
#include <stdio.h>
|
||
|
||
char *format[] = {
|
||
"[%.2f]",
|
||
"[% .2f]",
|
||
"[%+.2f]",
|
||
"[%7.2f]",
|
||
"[% 7.2f]",
|
||
"[%+7.2f]",
|
||
"[% +7.2f]",
|
||
"[%07.2f]",
|
||
"[% 07.2f]",
|
||
"[%+07.2f]",
|
||
"[% +07.2f]"
|
||
};
|
||
|
||
int main(void) {
|
||
int i;
|
||
for(i = 0; i < 11; i++) {
|
||
printf("%s: ", format[i]);
|
||
printf(format[i], 1.0);
|
||
printf(" ");
|
||
printf(format[i], -1.0);
|
||
printf("\n");
|
||
}
|
||
}
|
||
|
||
Output:
|
||
[%.2f]: [1.00] [-1.00]
|
||
[% .2f]: [ 1.00] [-1.00]
|
||
[%+.2f]: [+1.00] [-1.00]
|
||
[%7.2f]: [ 1.00] [ -1.00]
|
||
[% 7.2f]: [ 1.00] [ -1.00]
|
||
[%+7.2f]: [ +1.00] [ -1.00]
|
||
[% +7.2f]: [ +1.00] [ -1.00]
|
||
[%07.2f]: [0001.00] [-001.00]
|
||
[% 07.2f]: [ 001.00] [-001.00]
|
||
[%+07.2f]: [+001.00] [-001.00]
|
||
[% +07.2f]: [+001.00] [-001.00]
|
||
|
||
*/
|
||
{"%.2f", 1.0, "1.00"},
|
||
{"%.2f", -1.0, "-1.00"},
|
||
{"% .2f", 1.0, " 1.00"},
|
||
{"% .2f", -1.0, "-1.00"},
|
||
{"%+.2f", 1.0, "+1.00"},
|
||
{"%+.2f", -1.0, "-1.00"},
|
||
{"%7.2f", 1.0, " 1.00"},
|
||
{"%7.2f", -1.0, " -1.00"},
|
||
{"% 7.2f", 1.0, " 1.00"},
|
||
{"% 7.2f", -1.0, " -1.00"},
|
||
{"%+7.2f", 1.0, " +1.00"},
|
||
{"%+7.2f", -1.0, " -1.00"},
|
||
{"% +7.2f", 1.0, " +1.00"},
|
||
{"% +7.2f", -1.0, " -1.00"},
|
||
{"%07.2f", 1.0, "0001.00"},
|
||
{"%07.2f", -1.0, "-001.00"},
|
||
{"% 07.2f", 1.0, " 001.00"},
|
||
{"% 07.2f", -1.0, "-001.00"},
|
||
{"%+07.2f", 1.0, "+001.00"},
|
||
{"%+07.2f", -1.0, "-001.00"},
|
||
{"% +07.2f", 1.0, "+001.00"},
|
||
{"% +07.2f", -1.0, "-001.00"},
|
||
|
||
// Complex numbers: exhaustively tested in TestComplexFormatting.
|
||
{"%7.2f", 1 + 2i, "( 1.00 +2.00i)"},
|
||
{"%+07.2f", -1 - 2i, "(-001.00-002.00i)"},
|
||
|
||
// Use spaces instead of zero if padding to the right.
|
||
{"%0-5s", "abc", "abc "},
|
||
{"%-05.1f", 1.0, "1.0 "},
|
||
|
||
// float and complex formatting should not change the padding width
|
||
// for other elements. See issue 14642.
|
||
{"%06v", []any{+10.0, 10}, "[000010 000010]"},
|
||
{"%06v", []any{-10.0, 10}, "[-00010 000010]"},
|
||
{"%06v", []any{+10.0 + 10i, 10}, "[(000010+00010i) 000010]"},
|
||
{"%06v", []any{-10.0 + 10i, 10}, "[(-00010+00010i) 000010]"},
|
||
|
||
// integer formatting should not alter padding for other elements.
|
||
{"%03.6v", []any{1, 2.0, "x"}, "[000001 002 00x]"},
|
||
{"%03.0v", []any{0, 2.0, "x"}, "[ 002 000]"},
|
||
|
||
// Complex fmt used to leave the plus flag set for future entries in the array
|
||
// causing +2+0i and +3+0i instead of 2+0i and 3+0i.
|
||
{"%v", []complex64{1, 2, 3}, "[(1+0i) (2+0i) (3+0i)]"},
|
||
{"%v", []complex128{1, 2, 3}, "[(1+0i) (2+0i) (3+0i)]"},
|
||
|
||
// Incomplete format specification caused crash.
|
||
{"%.", 3, "%!.(int=3)"},
|
||
|
||
// Padding for complex numbers. Has been bad, then fixed, then bad again.
|
||
{"%+10.2f", +104.66 + 440.51i, "( +104.66 +440.51i)"},
|
||
{"%+10.2f", -104.66 + 440.51i, "( -104.66 +440.51i)"},
|
||
{"%+10.2f", +104.66 - 440.51i, "( +104.66 -440.51i)"},
|
||
{"%+10.2f", -104.66 - 440.51i, "( -104.66 -440.51i)"},
|
||
{"%+010.2f", +104.66 + 440.51i, "(+000104.66+000440.51i)"},
|
||
{"%+010.2f", -104.66 + 440.51i, "(-000104.66+000440.51i)"},
|
||
{"%+010.2f", +104.66 - 440.51i, "(+000104.66-000440.51i)"},
|
||
{"%+010.2f", -104.66 - 440.51i, "(-000104.66-000440.51i)"},
|
||
|
||
// []T where type T is a byte with a Stringer method.
|
||
{"%v", byteStringerSlice, "[X X X X X]"},
|
||
{"%s", byteStringerSlice, "hello"},
|
||
{"%q", byteStringerSlice, "\"hello\""},
|
||
{"%x", byteStringerSlice, "68656c6c6f"},
|
||
{"%X", byteStringerSlice, "68656C6C6F"},
|
||
{"%#v", byteStringerSlice, "[]fmt_test.byteStringer{0x68, 0x65, 0x6c, 0x6c, 0x6f}"},
|
||
|
||
// And the same for Formatter.
|
||
{"%v", byteFormatterSlice, "[X X X X X]"},
|
||
{"%s", byteFormatterSlice, "hello"},
|
||
{"%q", byteFormatterSlice, "\"hello\""},
|
||
{"%x", byteFormatterSlice, "68656c6c6f"},
|
||
{"%X", byteFormatterSlice, "68656C6C6F"},
|
||
// This next case seems wrong, but the docs say the Formatter wins here.
|
||
{"%#v", byteFormatterSlice, "[]fmt_test.byteFormatter{X, X, X, X, X}"},
|
||
|
||
// pp.WriteString
|
||
{"%s", writeStringFormatter(""), "******"},
|
||
{"%s", writeStringFormatter("xyz"), "***xyz***"},
|
||
{"%s", writeStringFormatter("⌘/⌘"), "***⌘/⌘***"},
|
||
|
||
// reflect.Value handled specially in Go 1.5, making it possible to
|
||
// see inside non-exported fields (which cannot be accessed with Interface()).
|
||
// Issue 8965.
|
||
{"%v", reflect.ValueOf(A{}).Field(0).String(), "<int Value>"}, // Equivalent to the old way.
|
||
{"%v", reflect.ValueOf(A{}).Field(0), "0"}, // Sees inside the field.
|
||
|
||
// verbs apply to the extracted value too.
|
||
{"%s", reflect.ValueOf("hello"), "hello"},
|
||
{"%q", reflect.ValueOf("hello"), `"hello"`},
|
||
{"%#04x", reflect.ValueOf(256), "0x0100"},
|
||
|
||
// invalid reflect.Value doesn't crash.
|
||
{"%v", reflect.Value{}, "<invalid reflect.Value>"},
|
||
{"%v", &reflect.Value{}, "<invalid Value>"},
|
||
{"%v", SI{reflect.Value{}}, "{<invalid Value>}"},
|
||
|
||
// Tests to check that not supported verbs generate an error string.
|
||
{"%☠", nil, "%!☠(<nil>)"},
|
||
{"%☠", any(nil), "%!☠(<nil>)"},
|
||
{"%☠", int(0), "%!☠(int=0)"},
|
||
{"%☠", uint(0), "%!☠(uint=0)"},
|
||
{"%☠", []byte{0, 1}, "[%!☠(uint8=0) %!☠(uint8=1)]"},
|
||
{"%☠", []uint8{0, 1}, "[%!☠(uint8=0) %!☠(uint8=1)]"},
|
||
{"%☠", [1]byte{0}, "[%!☠(uint8=0)]"},
|
||
{"%☠", [1]uint8{0}, "[%!☠(uint8=0)]"},
|
||
{"%☠", "hello", "%!☠(string=hello)"},
|
||
{"%☠", 1.2345678, "%!☠(float64=1.2345678)"},
|
||
{"%☠", float32(1.2345678), "%!☠(float32=1.2345678)"},
|
||
{"%☠", 1.2345678 + 1.2345678i, "%!☠(complex128=(1.2345678+1.2345678i))"},
|
||
{"%☠", complex64(1.2345678 + 1.2345678i), "%!☠(complex64=(1.2345678+1.2345678i))"},
|
||
{"%☠", &intVar, "%!☠(*int=0xPTR)"},
|
||
{"%☠", make(chan int), "%!☠(chan int=0xPTR)"},
|
||
{"%☠", func() {}, "%!☠(func()=0xPTR)"},
|
||
{"%☠", reflect.ValueOf(renamedInt(0)), "%!☠(fmt_test.renamedInt=0)"},
|
||
{"%☠", SI{renamedInt(0)}, "{%!☠(fmt_test.renamedInt=0)}"},
|
||
{"%☠", &[]any{I(1), G(2)}, "&[%!☠(fmt_test.I=1) %!☠(fmt_test.G=2)]"},
|
||
{"%☠", SI{&[]any{I(1), G(2)}}, "{%!☠(*[]interface {}=&[1 2])}"},
|
||
{"%☠", reflect.Value{}, "<invalid reflect.Value>"},
|
||
{"%☠", map[float64]int{NaN: 1}, "map[%!☠(float64=NaN):%!☠(int=1)]"},
|
||
}
|
||
|
||
// zeroFill generates zero-filled strings of the specified width. The length
|
||
// of the suffix (but not the prefix) is compensated for in the width calculation.
|
||
func zeroFill(prefix string, width int, suffix string) string {
|
||
return prefix + strings.Repeat("0", width-len(suffix)) + suffix
|
||
}
|
||
|
||
func TestSprintf(t *testing.T) {
|
||
for _, tt := range fmtTests {
|
||
s := Sprintf(tt.fmt, tt.val)
|
||
i := strings.Index(tt.out, "PTR")
|
||
if i >= 0 && i < len(s) {
|
||
var pattern, chars string
|
||
switch {
|
||
case strings.HasPrefix(tt.out[i:], "PTR_b"):
|
||
pattern = "PTR_b"
|
||
chars = "01"
|
||
case strings.HasPrefix(tt.out[i:], "PTR_o"):
|
||
pattern = "PTR_o"
|
||
chars = "01234567"
|
||
case strings.HasPrefix(tt.out[i:], "PTR_d"):
|
||
pattern = "PTR_d"
|
||
chars = "0123456789"
|
||
case strings.HasPrefix(tt.out[i:], "PTR_x"):
|
||
pattern = "PTR_x"
|
||
chars = "0123456789abcdef"
|
||
case strings.HasPrefix(tt.out[i:], "PTR_X"):
|
||
pattern = "PTR_X"
|
||
chars = "0123456789ABCDEF"
|
||
default:
|
||
pattern = "PTR"
|
||
chars = "0123456789abcdefABCDEF"
|
||
}
|
||
p := s[:i] + pattern
|
||
for j := i; j < len(s); j++ {
|
||
if !strings.ContainsRune(chars, rune(s[j])) {
|
||
p += s[j:]
|
||
break
|
||
}
|
||
}
|
||
s = p
|
||
}
|
||
if s != tt.out {
|
||
if _, ok := tt.val.(string); ok {
|
||
// Don't requote the already-quoted strings.
|
||
// It's too confusing to read the errors.
|
||
t.Errorf("Sprintf(%q, %q) = <%s> want <%s>", tt.fmt, tt.val, s, tt.out)
|
||
} else {
|
||
t.Errorf("Sprintf(%q, %v) = %q want %q", tt.fmt, tt.val, s, tt.out)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// TestComplexFormatting checks that a complex always formats to the same
|
||
// thing as if done by hand with two singleton prints.
|
||
func TestComplexFormatting(t *testing.T) {
|
||
var yesNo = []bool{true, false}
|
||
var values = []float64{1, 0, -1, posInf, negInf, NaN}
|
||
for _, plus := range yesNo {
|
||
for _, zero := range yesNo {
|
||
for _, space := range yesNo {
|
||
for _, char := range "fFeEgG" {
|
||
realFmt := "%"
|
||
if zero {
|
||
realFmt += "0"
|
||
}
|
||
if space {
|
||
realFmt += " "
|
||
}
|
||
if plus {
|
||
realFmt += "+"
|
||
}
|
||
realFmt += "10.2"
|
||
realFmt += string(char)
|
||
// Imaginary part always has a sign, so force + and ignore space.
|
||
imagFmt := "%"
|
||
if zero {
|
||
imagFmt += "0"
|
||
}
|
||
imagFmt += "+"
|
||
imagFmt += "10.2"
|
||
imagFmt += string(char)
|
||
for _, realValue := range values {
|
||
for _, imagValue := range values {
|
||
one := Sprintf(realFmt, complex(realValue, imagValue))
|
||
two := Sprintf("("+realFmt+imagFmt+"i)", realValue, imagValue)
|
||
if one != two {
|
||
t.Error(f, one, two)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
type SE []any // slice of empty; notational compactness.
|
||
|
||
var reorderTests = []struct {
|
||
fmt string
|
||
val SE
|
||
out string
|
||
}{
|
||
{"%[1]d", SE{1}, "1"},
|
||
{"%[2]d", SE{2, 1}, "1"},
|
||
{"%[2]d %[1]d", SE{1, 2}, "2 1"},
|
||
{"%[2]*[1]d", SE{2, 5}, " 2"},
|
||
{"%6.2f", SE{12.0}, " 12.00"}, // Explicit version of next line.
|
||
{"%[3]*.[2]*[1]f", SE{12.0, 2, 6}, " 12.00"},
|
||
{"%[1]*.[2]*[3]f", SE{6, 2, 12.0}, " 12.00"},
|
||
{"%10f", SE{12.0}, " 12.000000"},
|
||
{"%[1]*[3]f", SE{10, 99, 12.0}, " 12.000000"},
|
||
{"%.6f", SE{12.0}, "12.000000"}, // Explicit version of next line.
|
||
{"%.[1]*[3]f", SE{6, 99, 12.0}, "12.000000"},
|
||
{"%6.f", SE{12.0}, " 12"}, // // Explicit version of next line; empty precision means zero.
|
||
{"%[1]*.[3]f", SE{6, 3, 12.0}, " 12"},
|
||
// An actual use! Print the same arguments twice.
|
||
{"%d %d %d %#[1]o %#o %#o", SE{11, 12, 13}, "11 12 13 013 014 015"},
|
||
|
||
// Erroneous cases.
|
||
{"%[d", SE{2, 1}, "%!d(BADINDEX)"},
|
||
{"%]d", SE{2, 1}, "%!](int=2)d%!(EXTRA int=1)"},
|
||
{"%[]d", SE{2, 1}, "%!d(BADINDEX)"},
|
||
{"%[-3]d", SE{2, 1}, "%!d(BADINDEX)"},
|
||
{"%[99]d", SE{2, 1}, "%!d(BADINDEX)"},
|
||
{"%[3]", SE{2, 1}, "%!(NOVERB)"},
|
||
{"%[1].2d", SE{5, 6}, "%!d(BADINDEX)"},
|
||
{"%[1]2d", SE{2, 1}, "%!d(BADINDEX)"},
|
||
{"%3.[2]d", SE{7}, "%!d(BADINDEX)"},
|
||
{"%.[2]d", SE{7}, "%!d(BADINDEX)"},
|
||
{"%d %d %d %#[1]o %#o %#o %#o", SE{11, 12, 13}, "11 12 13 013 014 015 %!o(MISSING)"},
|
||
{"%[5]d %[2]d %d", SE{1, 2, 3}, "%!d(BADINDEX) 2 3"},
|
||
{"%d %[3]d %d", SE{1, 2}, "1 %!d(BADINDEX) 2"}, // Erroneous index does not affect sequence.
|
||
{"%.[]", SE{}, "%!](BADINDEX)"}, // Issue 10675
|
||
{"%.-3d", SE{42}, "%!-(int=42)3d"}, // TODO: Should this set return better error messages?
|
||
{"%2147483648d", SE{42}, "%!(NOVERB)%!(EXTRA int=42)"},
|
||
{"%-2147483648d", SE{42}, "%!(NOVERB)%!(EXTRA int=42)"},
|
||
{"%.2147483648d", SE{42}, "%!(NOVERB)%!(EXTRA int=42)"},
|
||
}
|
||
|
||
func TestReorder(t *testing.T) {
|
||
for _, tt := range reorderTests {
|
||
s := Sprintf(tt.fmt, tt.val...)
|
||
if s != tt.out {
|
||
t.Errorf("Sprintf(%q, %v) = <%s> want <%s>", tt.fmt, tt.val, s, tt.out)
|
||
} else {
|
||
}
|
||
}
|
||
}
|
||
|
||
func BenchmarkSprintfPadding(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%16f", 1.0)
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfEmpty(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("")
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfString(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%s", "hello")
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfTruncateString(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%.3s", "日本語日本語日本語日本語")
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfTruncateBytes(b *testing.B) {
|
||
var bytes any = []byte("日本語日本語日本語日本語")
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%.3s", bytes)
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfSlowParsingPath(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%.v", nil)
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfQuoteString(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%q", "日本語日本語日本語")
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfInt(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%d", 5)
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfIntInt(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%d %d", 5, 6)
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfPrefixedInt(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("This is some meaningless prefix text that needs to be scanned %d", 6)
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfFloat(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%g", 5.23184)
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfComplex(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%f", 5.23184+5.23184i)
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfBoolean(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%t", true)
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfHexString(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("% #x", "0123456789abcdef")
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfHexBytes(b *testing.B) {
|
||
data := []byte("0123456789abcdef")
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("% #x", data)
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfBytes(b *testing.B) {
|
||
data := []byte("0123456789abcdef")
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%v", data)
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfStringer(b *testing.B) {
|
||
stringer := I(12345)
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%v", stringer)
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkSprintfStructure(b *testing.B) {
|
||
s := &[]any{SI{12345}, map[int]string{0: "hello"}}
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
for pb.Next() {
|
||
_ = Sprintf("%#v", s)
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkManyArgs(b *testing.B) {
|
||
b.RunParallel(func(pb *testing.PB) {
|
||
var buf bytes.Buffer
|
||
for pb.Next() {
|
||
buf.Reset()
|
||
Fprintf(&buf, "%2d/%2d/%2d %d:%d:%d %s %s\n", 3, 4, 5, 11, 12, 13, "hello", "world")
|
||
}
|
||
})
|
||
}
|
||
|
||
func BenchmarkFprintInt(b *testing.B) {
|
||
var buf bytes.Buffer
|
||
for i := 0; i < b.N; i++ {
|
||
buf.Reset()
|
||
Fprint(&buf, 123456)
|
||
}
|
||
}
|
||
|
||
func BenchmarkFprintfBytes(b *testing.B) {
|
||
data := []byte(string("0123456789"))
|
||
var buf bytes.Buffer
|
||
for i := 0; i < b.N; i++ {
|
||
buf.Reset()
|
||
Fprintf(&buf, "%s", data)
|
||
}
|
||
}
|
||
|
||
func BenchmarkFprintIntNoAlloc(b *testing.B) {
|
||
var x any = 123456
|
||
var buf bytes.Buffer
|
||
for i := 0; i < b.N; i++ {
|
||
buf.Reset()
|
||
Fprint(&buf, x)
|
||
}
|
||
}
|
||
|
||
var mallocBuf bytes.Buffer
|
||
var mallocPointer *int // A pointer so we know the interface value won't allocate.
|
||
|
||
var mallocTest = []struct {
|
||
count int
|
||
desc string
|
||
fn func()
|
||
}{
|
||
{0, `Sprintf("")`, func() { _ = Sprintf("") }},
|
||
{1, `Sprintf("xxx")`, func() { _ = Sprintf("xxx") }},
|
||
{0, `Sprintf("%x")`, func() { _ = Sprintf("%x", 7) }},
|
||
{1, `Sprintf("%x")`, func() { _ = Sprintf("%x", 1<<16) }},
|
||
{3, `Sprintf("%80000s")`, func() { _ = Sprintf("%80000s", "hello") }}, // large buffer (>64KB)
|
||
{1, `Sprintf("%s")`, func() { _ = Sprintf("%s", "hello") }},
|
||
{1, `Sprintf("%x %x")`, func() { _ = Sprintf("%x %x", 7, 112) }},
|
||
{1, `Sprintf("%g")`, func() { _ = Sprintf("%g", float32(3.14159)) }},
|
||
{0, `Fprintf(buf, "%s")`, func() { mallocBuf.Reset(); Fprintf(&mallocBuf, "%s", "hello") }},
|
||
{0, `Fprintf(buf, "%x")`, func() { mallocBuf.Reset(); Fprintf(&mallocBuf, "%x", 7) }},
|
||
{0, `Fprintf(buf, "%x")`, func() { mallocBuf.Reset(); Fprintf(&mallocBuf, "%x", 1<<16) }},
|
||
{2, `Fprintf(buf, "%80000s")`, func() { mallocBuf.Reset(); Fprintf(&mallocBuf, "%80000s", "hello") }}, // large buffer (>64KB)
|
||
// If the interface value doesn't need to allocate, amortized allocation overhead should be zero.
|
||
{0, `Fprintf(buf, "%x %x %x")`, func() {
|
||
mallocBuf.Reset()
|
||
Fprintf(&mallocBuf, "%x %x %x", mallocPointer, mallocPointer, mallocPointer)
|
||
}},
|
||
}
|
||
|
||
var _ bytes.Buffer
|
||
|
||
func TestCountMallocs(t *testing.T) {
|
||
switch {
|
||
case testing.Short():
|
||
t.Skip("skipping malloc count in short mode")
|
||
case runtime.GOMAXPROCS(0) > 1:
|
||
t.Skip("skipping; GOMAXPROCS>1")
|
||
case race.Enabled:
|
||
t.Skip("skipping malloc count under race detector")
|
||
}
|
||
for _, mt := range mallocTest {
|
||
mallocs := testing.AllocsPerRun(100, mt.fn)
|
||
if got, max := mallocs, float64(mt.count); got > max {
|
||
t.Errorf("%s: got %v allocs, want <=%v", mt.desc, got, max)
|
||
}
|
||
}
|
||
}
|
||
|
||
type flagPrinter struct{}
|
||
|
||
func (flagPrinter) Format(f State, c rune) {
|
||
s := "%"
|
||
for i := 0; i < 128; i++ {
|
||
if f.Flag(i) {
|
||
s += string(rune(i))
|
||
}
|
||
}
|
||
if w, ok := f.Width(); ok {
|
||
s += Sprintf("%d", w)
|
||
}
|
||
if p, ok := f.Precision(); ok {
|
||
s += Sprintf(".%d", p)
|
||
}
|
||
s += string(c)
|
||
io.WriteString(f, "["+s+"]")
|
||
}
|
||
|
||
var flagtests = []struct {
|
||
in string
|
||
out string
|
||
}{
|
||
{"%a", "[%a]"},
|
||
{"%-a", "[%-a]"},
|
||
{"%+a", "[%+a]"},
|
||
{"%#a", "[%#a]"},
|
||
{"% a", "[% a]"},
|
||
{"%0a", "[%0a]"},
|
||
{"%1.2a", "[%1.2a]"},
|
||
{"%-1.2a", "[%-1.2a]"},
|
||
{"%+1.2a", "[%+1.2a]"},
|
||
{"%-+1.2a", "[%+-1.2a]"},
|
||
{"%-+1.2abc", "[%+-1.2a]bc"},
|
||
{"%-1.2abc", "[%-1.2a]bc"},
|
||
{"%-0abc", "[%-0a]bc"},
|
||
}
|
||
|
||
func TestFlagParser(t *testing.T) {
|
||
var flagprinter flagPrinter
|
||
for _, tt := range flagtests {
|
||
s := Sprintf(tt.in, &flagprinter)
|
||
if s != tt.out {
|
||
t.Errorf("Sprintf(%q, &flagprinter) => %q, want %q", tt.in, s, tt.out)
|
||
}
|
||
}
|
||
}
|
||
|
||
func TestStructPrinter(t *testing.T) {
|
||
type T struct {
|
||
a string
|
||
b string
|
||
c int
|
||
}
|
||
var s T
|
||
s.a = "abc"
|
||
s.b = "def"
|
||
s.c = 123
|
||
var tests = []struct {
|
||
fmt string
|
||
out string
|
||
}{
|
||
{"%v", "{abc def 123}"},
|
||
{"%+v", "{a:abc b:def c:123}"},
|
||
{"%#v", `fmt_test.T{a:"abc", b:"def", c:123}`},
|
||
}
|
||
for _, tt := range tests {
|
||
out := Sprintf(tt.fmt, s)
|
||
if out != tt.out {
|
||
t.Errorf("Sprintf(%q, s) = %#q, want %#q", tt.fmt, out, tt.out)
|
||
}
|
||
// The same but with a pointer.
|
||
out = Sprintf(tt.fmt, &s)
|
||
if out != "&"+tt.out {
|
||
t.Errorf("Sprintf(%q, &s) = %#q, want %#q", tt.fmt, out, "&"+tt.out)
|
||
}
|
||
}
|
||
}
|
||
|
||
func TestSlicePrinter(t *testing.T) {
|
||
slice := []int{}
|
||
s := Sprint(slice)
|
||
if s != "[]" {
|
||
t.Errorf("empty slice printed as %q not %q", s, "[]")
|
||
}
|
||
slice = []int{1, 2, 3}
|
||
s = Sprint(slice)
|
||
if s != "[1 2 3]" {
|
||
t.Errorf("slice: got %q expected %q", s, "[1 2 3]")
|
||
}
|
||
s = Sprint(&slice)
|
||
if s != "&[1 2 3]" {
|
||
t.Errorf("&slice: got %q expected %q", s, "&[1 2 3]")
|
||
}
|
||
}
|
||
|
||
// presentInMap checks map printing using substrings so we don't depend on the
|
||
// print order.
|
||
func presentInMap(s string, a []string, t *testing.T) {
|
||
for i := 0; i < len(a); i++ {
|
||
loc := strings.Index(s, a[i])
|
||
if loc < 0 {
|
||
t.Errorf("map print: expected to find %q in %q", a[i], s)
|
||
}
|
||
// make sure the match ends here
|
||
loc += len(a[i])
|
||
if loc >= len(s) || (s[loc] != ' ' && s[loc] != ']') {
|
||
t.Errorf("map print: %q not properly terminated in %q", a[i], s)
|
||
}
|
||
}
|
||
}
|
||
|
||
func TestMapPrinter(t *testing.T) {
|
||
m0 := make(map[int]string)
|
||
s := Sprint(m0)
|
||
if s != "map[]" {
|
||
t.Errorf("empty map printed as %q not %q", s, "map[]")
|
||
}
|
||
m1 := map[int]string{1: "one", 2: "two", 3: "three"}
|
||
a := []string{"1:one", "2:two", "3:three"}
|
||
presentInMap(Sprintf("%v", m1), a, t)
|
||
presentInMap(Sprint(m1), a, t)
|
||
// Pointer to map prints the same but with initial &.
|
||
if !strings.HasPrefix(Sprint(&m1), "&") {
|
||
t.Errorf("no initial & for address of map")
|
||
}
|
||
presentInMap(Sprintf("%v", &m1), a, t)
|
||
presentInMap(Sprint(&m1), a, t)
|
||
}
|
||
|
||
func TestEmptyMap(t *testing.T) {
|
||
const emptyMapStr = "map[]"
|
||
var m map[string]int
|
||
s := Sprint(m)
|
||
if s != emptyMapStr {
|
||
t.Errorf("nil map printed as %q not %q", s, emptyMapStr)
|
||
}
|
||
m = make(map[string]int)
|
||
s = Sprint(m)
|
||
if s != emptyMapStr {
|
||
t.Errorf("empty map printed as %q not %q", s, emptyMapStr)
|
||
}
|
||
}
|
||
|
||
// TestBlank checks that Sprint (and hence Print, Fprint) puts spaces in the
|
||
// right places, that is, between arg pairs in which neither is a string.
|
||
func TestBlank(t *testing.T) {
|
||
got := Sprint("<", 1, ">:", 1, 2, 3, "!")
|
||
expect := "<1>:1 2 3!"
|
||
if got != expect {
|
||
t.Errorf("got %q expected %q", got, expect)
|
||
}
|
||
}
|
||
|
||
// TestBlankln checks that Sprintln (and hence Println, Fprintln) puts spaces in
|
||
// the right places, that is, between all arg pairs.
|
||
func TestBlankln(t *testing.T) {
|
||
got := Sprintln("<", 1, ">:", 1, 2, 3, "!")
|
||
expect := "< 1 >: 1 2 3 !\n"
|
||
if got != expect {
|
||
t.Errorf("got %q expected %q", got, expect)
|
||
}
|
||
}
|
||
|
||
// TestFormatterPrintln checks Formatter with Sprint, Sprintln, Sprintf.
|
||
func TestFormatterPrintln(t *testing.T) {
|
||
f := F(1)
|
||
expect := "<v=F(1)>\n"
|
||
s := Sprint(f, "\n")
|
||
if s != expect {
|
||
t.Errorf("Sprint wrong with Formatter: expected %q got %q", expect, s)
|
||
}
|
||
s = Sprintln(f)
|
||
if s != expect {
|
||
t.Errorf("Sprintln wrong with Formatter: expected %q got %q", expect, s)
|
||
}
|
||
s = Sprintf("%v\n", f)
|
||
if s != expect {
|
||
t.Errorf("Sprintf wrong with Formatter: expected %q got %q", expect, s)
|
||
}
|
||
}
|
||
|
||
func args(a ...any) []any { return a }
|
||
|
||
var startests = []struct {
|
||
fmt string
|
||
in []any
|
||
out string
|
||
}{
|
||
{"%*d", args(4, 42), " 42"},
|
||
{"%-*d", args(4, 42), "42 "},
|
||
{"%*d", args(-4, 42), "42 "},
|
||
{"%-*d", args(-4, 42), "42 "},
|
||
{"%.*d", args(4, 42), "0042"},
|
||
{"%*.*d", args(8, 4, 42), " 0042"},
|
||
{"%0*d", args(4, 42), "0042"},
|
||
// Some non-int types for width. (Issue 10732).
|
||
{"%0*d", args(uint(4), 42), "0042"},
|
||
{"%0*d", args(uint64(4), 42), "0042"},
|
||
{"%0*d", args('\x04', 42), "0042"},
|
||
{"%0*d", args(uintptr(4), 42), "0042"},
|
||
|
||
// erroneous
|
||
{"%*d", args(nil, 42), "%!(BADWIDTH)42"},
|
||
{"%*d", args(int(1e7), 42), "%!(BADWIDTH)42"},
|
||
{"%*d", args(int(-1e7), 42), "%!(BADWIDTH)42"},
|
||
{"%.*d", args(nil, 42), "%!(BADPREC)42"},
|
||
{"%.*d", args(-1, 42), "%!(BADPREC)42"},
|
||
{"%.*d", args(int(1e7), 42), "%!(BADPREC)42"},
|
||
{"%.*d", args(uint(1e7), 42), "%!(BADPREC)42"},
|
||
{"%.*d", args(uint64(1<<63), 42), "%!(BADPREC)42"}, // Huge negative (-inf).
|
||
{"%.*d", args(uint64(1<<64-1), 42), "%!(BADPREC)42"}, // Small negative (-1).
|
||
{"%*d", args(5, "foo"), "%!d(string= foo)"},
|
||
{"%*% %d", args(20, 5), "% 5"},
|
||
{"%*", args(4), "%!(NOVERB)"},
|
||
}
|
||
|
||
func TestWidthAndPrecision(t *testing.T) {
|
||
for i, tt := range startests {
|
||
s := Sprintf(tt.fmt, tt.in...)
|
||
if s != tt.out {
|
||
t.Errorf("#%d: %q: got %q expected %q", i, tt.fmt, s, tt.out)
|
||
}
|
||
}
|
||
}
|
||
|
||
// PanicS is a type that panics in String.
|
||
type PanicS struct {
|
||
message any
|
||
}
|
||
|
||
// Value receiver.
|
||
func (p PanicS) String() string {
|
||
panic(p.message)
|
||
}
|
||
|
||
// PanicGo is a type that panics in GoString.
|
||
type PanicGo struct {
|
||
message any
|
||
}
|
||
|
||
// Value receiver.
|
||
func (p PanicGo) GoString() string {
|
||
panic(p.message)
|
||
}
|
||
|
||
// PanicF is a type that panics in Format.
|
||
type PanicF struct {
|
||
message any
|
||
}
|
||
|
||
// Value receiver.
|
||
func (p PanicF) Format(f State, c rune) {
|
||
panic(p.message)
|
||
}
|
||
|
||
var panictests = []struct {
|
||
fmt string
|
||
in any
|
||
out string
|
||
}{
|
||
// String
|
||
{"%s", (*PanicS)(nil), "<nil>"}, // nil pointer special case
|
||
{"%s", PanicS{io.ErrUnexpectedEOF}, "%!s(PANIC=String method: unexpected EOF)"},
|
||
{"%s", PanicS{3}, "%!s(PANIC=String method: 3)"},
|
||
// GoString
|
||
{"%#v", (*PanicGo)(nil), "<nil>"}, // nil pointer special case
|
||
{"%#v", PanicGo{io.ErrUnexpectedEOF}, "%!v(PANIC=GoString method: unexpected EOF)"},
|
||
{"%#v", PanicGo{3}, "%!v(PANIC=GoString method: 3)"},
|
||
// Issue 18282. catchPanic should not clear fmtFlags permanently.
|
||
{"%#v", []any{PanicGo{3}, PanicGo{3}}, "[]interface {}{%!v(PANIC=GoString method: 3), %!v(PANIC=GoString method: 3)}"},
|
||
// Format
|
||
{"%s", (*PanicF)(nil), "<nil>"}, // nil pointer special case
|
||
{"%s", PanicF{io.ErrUnexpectedEOF}, "%!s(PANIC=Format method: unexpected EOF)"},
|
||
{"%s", PanicF{3}, "%!s(PANIC=Format method: 3)"},
|
||
}
|
||
|
||
func TestPanics(t *testing.T) {
|
||
for i, tt := range panictests {
|
||
s := Sprintf(tt.fmt, tt.in)
|
||
if s != tt.out {
|
||
t.Errorf("%d: %q: got %q expected %q", i, tt.fmt, s, tt.out)
|
||
}
|
||
}
|
||
}
|
||
|
||
// recurCount tests that erroneous String routine doesn't cause fatal recursion.
|
||
var recurCount = 0
|
||
|
||
type Recur struct {
|
||
i int
|
||
failed *bool
|
||
}
|
||
|
||
func (r *Recur) String() string {
|
||
if recurCount++; recurCount > 10 {
|
||
*r.failed = true
|
||
return "FAIL"
|
||
}
|
||
// This will call badVerb. Before the fix, that would cause us to recur into
|
||
// this routine to print %!p(value). Now we don't call the user's method
|
||
// during an error.
|
||
return Sprintf("recur@%p value: %d", r, r.i)
|
||
}
|
||
|
||
func TestBadVerbRecursion(t *testing.T) {
|
||
failed := false
|
||
r := &Recur{3, &failed}
|
||
_ = Sprintf("recur@%p value: %d\n", &r, r.i)
|
||
if failed {
|
||
t.Error("fail with pointer")
|
||
}
|
||
failed = false
|
||
r = &Recur{4, &failed}
|
||
_ = Sprintf("recur@%p, value: %d\n", r, r.i)
|
||
if failed {
|
||
t.Error("fail with value")
|
||
}
|
||
}
|
||
|
||
func TestIsSpace(t *testing.T) {
|
||
// This tests the internal isSpace function.
|
||
// IsSpace = isSpace is defined in export_test.go.
|
||
for i := rune(0); i <= unicode.MaxRune; i++ {
|
||
if IsSpace(i) != unicode.IsSpace(i) {
|
||
t.Errorf("isSpace(%U) = %v, want %v", i, IsSpace(i), unicode.IsSpace(i))
|
||
}
|
||
}
|
||
}
|
||
|
||
func hideFromVet(s string) string { return s }
|
||
|
||
func TestNilDoesNotBecomeTyped(t *testing.T) {
|
||
type A struct{}
|
||
type B struct{}
|
||
var a *A = nil
|
||
var b B = B{}
|
||
got := Sprintf(hideFromVet("%s %s %s %s %s"), nil, a, nil, b, nil)
|
||
const expect = "%!s(<nil>) %!s(*fmt_test.A=<nil>) %!s(<nil>) {} %!s(<nil>)"
|
||
if got != expect {
|
||
t.Errorf("expected:\n\t%q\ngot:\n\t%q", expect, got)
|
||
}
|
||
}
|
||
|
||
var formatterFlagTests = []struct {
|
||
in string
|
||
val any
|
||
out string
|
||
}{
|
||
// scalar values with the (unused by fmt) 'a' verb.
|
||
{"%a", flagPrinter{}, "[%a]"},
|
||
{"%-a", flagPrinter{}, "[%-a]"},
|
||
{"%+a", flagPrinter{}, "[%+a]"},
|
||
{"%#a", flagPrinter{}, "[%#a]"},
|
||
{"% a", flagPrinter{}, "[% a]"},
|
||
{"%0a", flagPrinter{}, "[%0a]"},
|
||
{"%1.2a", flagPrinter{}, "[%1.2a]"},
|
||
{"%-1.2a", flagPrinter{}, "[%-1.2a]"},
|
||
{"%+1.2a", flagPrinter{}, "[%+1.2a]"},
|
||
{"%-+1.2a", flagPrinter{}, "[%+-1.2a]"},
|
||
{"%-+1.2abc", flagPrinter{}, "[%+-1.2a]bc"},
|
||
{"%-1.2abc", flagPrinter{}, "[%-1.2a]bc"},
|
||
{"%-0abc", flagPrinter{}, "[%-0a]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"},
|
||
{"%-0abc", [1]flagPrinter{}, "[[%-0a]]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"},
|
||
{"%-0vbc", flagPrinter{}, "[%-0v]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"},
|
||
{"%-0vbc", [1]flagPrinter{}, "[[%-0v]]bc"},
|
||
}
|
||
|
||
func TestFormatterFlags(t *testing.T) {
|
||
for _, tt := range formatterFlagTests {
|
||
s := Sprintf(tt.in, tt.val)
|
||
if s != tt.out {
|
||
t.Errorf("Sprintf(%q, %T) = %q, want %q", tt.in, tt.val, s, tt.out)
|
||
}
|
||
}
|
||
}
|
||
|
||
func TestParsenum(t *testing.T) {
|
||
testCases := []struct {
|
||
s string
|
||
start, end int
|
||
num int
|
||
isnum bool
|
||
newi int
|
||
}{
|
||
{"a123", 0, 4, 0, false, 0},
|
||
{"1234", 1, 1, 0, false, 1},
|
||
{"123a", 0, 4, 123, true, 3},
|
||
{"12a3", 0, 4, 12, true, 2},
|
||
{"1234", 0, 4, 1234, true, 4},
|
||
{"1a234", 1, 3, 0, false, 1},
|
||
}
|
||
for _, tt := range testCases {
|
||
num, isnum, newi := Parsenum(tt.s, tt.start, tt.end)
|
||
if num != tt.num || isnum != tt.isnum || newi != tt.newi {
|
||
t.Errorf("parsenum(%q, %d, %d) = %d, %v, %d, want %d, %v, %d", tt.s, tt.start, tt.end, num, isnum, newi, tt.num, tt.isnum, tt.newi)
|
||
}
|
||
}
|
||
}
|
||
|
||
// Test the various Append printers. The details are well tested above;
|
||
// here we just make sure the byte slice is updated.
|
||
|
||
const (
|
||
appendResult = "hello world, 23"
|
||
hello = "hello "
|
||
)
|
||
|
||
func TestAppendf(t *testing.T) {
|
||
b := make([]byte, 100)
|
||
b = b[:copy(b, hello)]
|
||
got := Appendf(b, "world, %d", 23)
|
||
if string(got) != appendResult {
|
||
t.Fatalf("Appendf returns %q not %q", got, appendResult)
|
||
}
|
||
if &b[0] != &got[0] {
|
||
t.Fatalf("Appendf allocated a new slice")
|
||
}
|
||
}
|
||
|
||
func TestAppend(t *testing.T) {
|
||
b := make([]byte, 100)
|
||
b = b[:copy(b, hello)]
|
||
got := Append(b, "world", ", ", 23)
|
||
if string(got) != appendResult {
|
||
t.Fatalf("Append returns %q not %q", got, appendResult)
|
||
}
|
||
if &b[0] != &got[0] {
|
||
t.Fatalf("Append allocated a new slice")
|
||
}
|
||
}
|
||
|
||
func TestAppendln(t *testing.T) {
|
||
b := make([]byte, 100)
|
||
b = b[:copy(b, hello)]
|
||
got := Appendln(b, "world,", 23)
|
||
if string(got) != appendResult+"\n" {
|
||
t.Fatalf("Appendln returns %q not %q", got, appendResult+"\n")
|
||
}
|
||
if &b[0] != &got[0] {
|
||
t.Fatalf("Appendln allocated a new slice")
|
||
}
|
||
}
|