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-rw-r--r--src/bytes/example_test.go489
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diff --git a/src/bytes/example_test.go b/src/bytes/example_test.go
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+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bytes_test
+
+import (
+ "bytes"
+ "encoding/base64"
+ "fmt"
+ "io"
+ "os"
+ "sort"
+ "unicode"
+)
+
+func ExampleBuffer() {
+ var b bytes.Buffer // A Buffer needs no initialization.
+ b.Write([]byte("Hello "))
+ fmt.Fprintf(&b, "world!")
+ b.WriteTo(os.Stdout)
+ // Output: Hello world!
+}
+
+func ExampleBuffer_reader() {
+ // A Buffer can turn a string or a []byte into an io.Reader.
+ buf := bytes.NewBufferString("R29waGVycyBydWxlIQ==")
+ dec := base64.NewDecoder(base64.StdEncoding, buf)
+ io.Copy(os.Stdout, dec)
+ // Output: Gophers rule!
+}
+
+func ExampleBuffer_Bytes() {
+ buf := bytes.Buffer{}
+ buf.Write([]byte{'h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd'})
+ os.Stdout.Write(buf.Bytes())
+ // Output: hello world
+}
+
+func ExampleBuffer_Grow() {
+ var b bytes.Buffer
+ b.Grow(64)
+ bb := b.Bytes()
+ b.Write([]byte("64 bytes or fewer"))
+ fmt.Printf("%q", bb[:b.Len()])
+ // Output: "64 bytes or fewer"
+}
+
+func ExampleBuffer_Len() {
+ var b bytes.Buffer
+ b.Grow(64)
+ b.Write([]byte("abcde"))
+ fmt.Printf("%d", b.Len())
+ // Output: 5
+}
+
+func ExampleCompare() {
+ // Interpret Compare's result by comparing it to zero.
+ var a, b []byte
+ if bytes.Compare(a, b) < 0 {
+ // a less b
+ }
+ if bytes.Compare(a, b) <= 0 {
+ // a less or equal b
+ }
+ if bytes.Compare(a, b) > 0 {
+ // a greater b
+ }
+ if bytes.Compare(a, b) >= 0 {
+ // a greater or equal b
+ }
+
+ // Prefer Equal to Compare for equality comparisons.
+ if bytes.Equal(a, b) {
+ // a equal b
+ }
+ if !bytes.Equal(a, b) {
+ // a not equal b
+ }
+}
+
+func ExampleCompare_search() {
+ // Binary search to find a matching byte slice.
+ var needle []byte
+ var haystack [][]byte // Assume sorted
+ i := sort.Search(len(haystack), func(i int) bool {
+ // Return haystack[i] >= needle.
+ return bytes.Compare(haystack[i], needle) >= 0
+ })
+ if i < len(haystack) && bytes.Equal(haystack[i], needle) {
+ // Found it!
+ }
+}
+
+func ExampleTrimSuffix() {
+ var b = []byte("Hello, goodbye, etc!")
+ b = bytes.TrimSuffix(b, []byte("goodbye, etc!"))
+ b = bytes.TrimSuffix(b, []byte("gopher"))
+ b = append(b, bytes.TrimSuffix([]byte("world!"), []byte("x!"))...)
+ os.Stdout.Write(b)
+ // Output: Hello, world!
+}
+
+func ExampleTrimPrefix() {
+ var b = []byte("Goodbye,, world!")
+ b = bytes.TrimPrefix(b, []byte("Goodbye,"))
+ b = bytes.TrimPrefix(b, []byte("See ya,"))
+ fmt.Printf("Hello%s", b)
+ // Output: Hello, world!
+}
+
+func ExampleFields() {
+ fmt.Printf("Fields are: %q", bytes.Fields([]byte(" foo bar baz ")))
+ // Output: Fields are: ["foo" "bar" "baz"]
+}
+
+func ExampleFieldsFunc() {
+ f := func(c rune) bool {
+ return !unicode.IsLetter(c) && !unicode.IsNumber(c)
+ }
+ fmt.Printf("Fields are: %q", bytes.FieldsFunc([]byte(" foo1;bar2,baz3..."), f))
+ // Output: Fields are: ["foo1" "bar2" "baz3"]
+}
+
+func ExampleContains() {
+ fmt.Println(bytes.Contains([]byte("seafood"), []byte("foo")))
+ fmt.Println(bytes.Contains([]byte("seafood"), []byte("bar")))
+ fmt.Println(bytes.Contains([]byte("seafood"), []byte("")))
+ fmt.Println(bytes.Contains([]byte(""), []byte("")))
+ // Output:
+ // true
+ // false
+ // true
+ // true
+}
+
+func ExampleContainsAny() {
+ fmt.Println(bytes.ContainsAny([]byte("I like seafood."), "fÄo!"))
+ fmt.Println(bytes.ContainsAny([]byte("I like seafood."), "去是伟大的."))
+ fmt.Println(bytes.ContainsAny([]byte("I like seafood."), ""))
+ fmt.Println(bytes.ContainsAny([]byte(""), ""))
+ // Output:
+ // true
+ // true
+ // false
+ // false
+}
+
+func ExampleContainsRune() {
+ fmt.Println(bytes.ContainsRune([]byte("I like seafood."), 'f'))
+ fmt.Println(bytes.ContainsRune([]byte("I like seafood."), 'ö'))
+ fmt.Println(bytes.ContainsRune([]byte("去是伟大的!"), '大'))
+ fmt.Println(bytes.ContainsRune([]byte("去是伟大的!"), '!'))
+ fmt.Println(bytes.ContainsRune([]byte(""), '@'))
+ // Output:
+ // true
+ // false
+ // true
+ // true
+ // false
+}
+
+func ExampleCount() {
+ fmt.Println(bytes.Count([]byte("cheese"), []byte("e")))
+ fmt.Println(bytes.Count([]byte("five"), []byte(""))) // before & after each rune
+ // Output:
+ // 3
+ // 5
+}
+
+func ExampleEqual() {
+ fmt.Println(bytes.Equal([]byte("Go"), []byte("Go")))
+ fmt.Println(bytes.Equal([]byte("Go"), []byte("C++")))
+ // Output:
+ // true
+ // false
+}
+
+func ExampleEqualFold() {
+ fmt.Println(bytes.EqualFold([]byte("Go"), []byte("go")))
+ // Output: true
+}
+
+func ExampleHasPrefix() {
+ fmt.Println(bytes.HasPrefix([]byte("Gopher"), []byte("Go")))
+ fmt.Println(bytes.HasPrefix([]byte("Gopher"), []byte("C")))
+ fmt.Println(bytes.HasPrefix([]byte("Gopher"), []byte("")))
+ // Output:
+ // true
+ // false
+ // true
+}
+
+func ExampleHasSuffix() {
+ fmt.Println(bytes.HasSuffix([]byte("Amigo"), []byte("go")))
+ fmt.Println(bytes.HasSuffix([]byte("Amigo"), []byte("O")))
+ fmt.Println(bytes.HasSuffix([]byte("Amigo"), []byte("Ami")))
+ fmt.Println(bytes.HasSuffix([]byte("Amigo"), []byte("")))
+ // Output:
+ // true
+ // false
+ // false
+ // true
+}
+
+func ExampleIndex() {
+ fmt.Println(bytes.Index([]byte("chicken"), []byte("ken")))
+ fmt.Println(bytes.Index([]byte("chicken"), []byte("dmr")))
+ // Output:
+ // 4
+ // -1
+}
+
+func ExampleIndexByte() {
+ fmt.Println(bytes.IndexByte([]byte("chicken"), byte('k')))
+ fmt.Println(bytes.IndexByte([]byte("chicken"), byte('g')))
+ // Output:
+ // 4
+ // -1
+}
+
+func ExampleIndexFunc() {
+ f := func(c rune) bool {
+ return unicode.Is(unicode.Han, c)
+ }
+ fmt.Println(bytes.IndexFunc([]byte("Hello, 世界"), f))
+ fmt.Println(bytes.IndexFunc([]byte("Hello, world"), f))
+ // Output:
+ // 7
+ // -1
+}
+
+func ExampleIndexAny() {
+ fmt.Println(bytes.IndexAny([]byte("chicken"), "aeiouy"))
+ fmt.Println(bytes.IndexAny([]byte("crwth"), "aeiouy"))
+ // Output:
+ // 2
+ // -1
+}
+
+func ExampleIndexRune() {
+ fmt.Println(bytes.IndexRune([]byte("chicken"), 'k'))
+ fmt.Println(bytes.IndexRune([]byte("chicken"), 'd'))
+ // Output:
+ // 4
+ // -1
+}
+
+func ExampleLastIndex() {
+ fmt.Println(bytes.Index([]byte("go gopher"), []byte("go")))
+ fmt.Println(bytes.LastIndex([]byte("go gopher"), []byte("go")))
+ fmt.Println(bytes.LastIndex([]byte("go gopher"), []byte("rodent")))
+ // Output:
+ // 0
+ // 3
+ // -1
+}
+
+func ExampleLastIndexAny() {
+ fmt.Println(bytes.LastIndexAny([]byte("go gopher"), "MüQp"))
+ fmt.Println(bytes.LastIndexAny([]byte("go 地鼠"), "地大"))
+ fmt.Println(bytes.LastIndexAny([]byte("go gopher"), "z,!."))
+ // Output:
+ // 5
+ // 3
+ // -1
+}
+
+func ExampleLastIndexByte() {
+ fmt.Println(bytes.LastIndexByte([]byte("go gopher"), byte('g')))
+ fmt.Println(bytes.LastIndexByte([]byte("go gopher"), byte('r')))
+ fmt.Println(bytes.LastIndexByte([]byte("go gopher"), byte('z')))
+ // Output:
+ // 3
+ // 8
+ // -1
+}
+
+func ExampleLastIndexFunc() {
+ fmt.Println(bytes.LastIndexFunc([]byte("go gopher!"), unicode.IsLetter))
+ fmt.Println(bytes.LastIndexFunc([]byte("go gopher!"), unicode.IsPunct))
+ fmt.Println(bytes.LastIndexFunc([]byte("go gopher!"), unicode.IsNumber))
+ // Output:
+ // 8
+ // 9
+ // -1
+}
+
+func ExampleJoin() {
+ s := [][]byte{[]byte("foo"), []byte("bar"), []byte("baz")}
+ fmt.Printf("%s", bytes.Join(s, []byte(", ")))
+ // Output: foo, bar, baz
+}
+
+func ExampleRepeat() {
+ fmt.Printf("ba%s", bytes.Repeat([]byte("na"), 2))
+ // Output: banana
+}
+
+func ExampleReplace() {
+ fmt.Printf("%s\n", bytes.Replace([]byte("oink oink oink"), []byte("k"), []byte("ky"), 2))
+ fmt.Printf("%s\n", bytes.Replace([]byte("oink oink oink"), []byte("oink"), []byte("moo"), -1))
+ // Output:
+ // oinky oinky oink
+ // moo moo moo
+}
+
+func ExampleReplaceAll() {
+ fmt.Printf("%s\n", bytes.ReplaceAll([]byte("oink oink oink"), []byte("oink"), []byte("moo")))
+ // Output:
+ // moo moo moo
+}
+
+func ExampleRunes() {
+ rs := bytes.Runes([]byte("go gopher"))
+ for _, r := range rs {
+ fmt.Printf("%#U\n", r)
+ }
+ // Output:
+ // U+0067 'g'
+ // U+006F 'o'
+ // U+0020 ' '
+ // U+0067 'g'
+ // U+006F 'o'
+ // U+0070 'p'
+ // U+0068 'h'
+ // U+0065 'e'
+ // U+0072 'r'
+}
+
+func ExampleSplit() {
+ fmt.Printf("%q\n", bytes.Split([]byte("a,b,c"), []byte(",")))
+ fmt.Printf("%q\n", bytes.Split([]byte("a man a plan a canal panama"), []byte("a ")))
+ fmt.Printf("%q\n", bytes.Split([]byte(" xyz "), []byte("")))
+ fmt.Printf("%q\n", bytes.Split([]byte(""), []byte("Bernardo O'Higgins")))
+ // Output:
+ // ["a" "b" "c"]
+ // ["" "man " "plan " "canal panama"]
+ // [" " "x" "y" "z" " "]
+ // [""]
+}
+
+func ExampleSplitN() {
+ fmt.Printf("%q\n", bytes.SplitN([]byte("a,b,c"), []byte(","), 2))
+ z := bytes.SplitN([]byte("a,b,c"), []byte(","), 0)
+ fmt.Printf("%q (nil = %v)\n", z, z == nil)
+ // Output:
+ // ["a" "b,c"]
+ // [] (nil = true)
+}
+
+func ExampleSplitAfter() {
+ fmt.Printf("%q\n", bytes.SplitAfter([]byte("a,b,c"), []byte(",")))
+ // Output: ["a," "b," "c"]
+}
+
+func ExampleSplitAfterN() {
+ fmt.Printf("%q\n", bytes.SplitAfterN([]byte("a,b,c"), []byte(","), 2))
+ // Output: ["a," "b,c"]
+}
+
+func ExampleTitle() {
+ fmt.Printf("%s", bytes.Title([]byte("her royal highness")))
+ // Output: Her Royal Highness
+}
+
+func ExampleToTitle() {
+ fmt.Printf("%s\n", bytes.ToTitle([]byte("loud noises")))
+ fmt.Printf("%s\n", bytes.ToTitle([]byte("хлеб")))
+ // Output:
+ // LOUD NOISES
+ // ХЛЕБ
+}
+
+func ExampleToTitleSpecial() {
+ str := []byte("ahoj vývojári golang")
+ totitle := bytes.ToTitleSpecial(unicode.AzeriCase, str)
+ fmt.Println("Original : " + string(str))
+ fmt.Println("ToTitle : " + string(totitle))
+ // Output:
+ // Original : ahoj vývojári golang
+ // ToTitle : AHOJ VÝVOJÁRİ GOLANG
+}
+
+func ExampleTrim() {
+ fmt.Printf("[%q]", bytes.Trim([]byte(" !!! Achtung! Achtung! !!! "), "! "))
+ // Output: ["Achtung! Achtung"]
+}
+
+func ExampleTrimFunc() {
+ fmt.Println(string(bytes.TrimFunc([]byte("go-gopher!"), unicode.IsLetter)))
+ fmt.Println(string(bytes.TrimFunc([]byte("\"go-gopher!\""), unicode.IsLetter)))
+ fmt.Println(string(bytes.TrimFunc([]byte("go-gopher!"), unicode.IsPunct)))
+ fmt.Println(string(bytes.TrimFunc([]byte("1234go-gopher!567"), unicode.IsNumber)))
+ // Output:
+ // -gopher!
+ // "go-gopher!"
+ // go-gopher
+ // go-gopher!
+}
+
+func ExampleMap() {
+ rot13 := func(r rune) rune {
+ switch {
+ case r >= 'A' && r <= 'Z':
+ return 'A' + (r-'A'+13)%26
+ case r >= 'a' && r <= 'z':
+ return 'a' + (r-'a'+13)%26
+ }
+ return r
+ }
+ fmt.Printf("%s", bytes.Map(rot13, []byte("'Twas brillig and the slithy gopher...")))
+ // Output: 'Gjnf oevyyvt naq gur fyvgul tbcure...
+}
+
+func ExampleTrimLeft() {
+ fmt.Print(string(bytes.TrimLeft([]byte("453gopher8257"), "0123456789")))
+ // Output:
+ // gopher8257
+}
+
+func ExampleTrimLeftFunc() {
+ fmt.Println(string(bytes.TrimLeftFunc([]byte("go-gopher"), unicode.IsLetter)))
+ fmt.Println(string(bytes.TrimLeftFunc([]byte("go-gopher!"), unicode.IsPunct)))
+ fmt.Println(string(bytes.TrimLeftFunc([]byte("1234go-gopher!567"), unicode.IsNumber)))
+ // Output:
+ // -gopher
+ // go-gopher!
+ // go-gopher!567
+}
+
+func ExampleTrimSpace() {
+ fmt.Printf("%s", bytes.TrimSpace([]byte(" \t\n a lone gopher \n\t\r\n")))
+ // Output: a lone gopher
+}
+
+func ExampleTrimRight() {
+ fmt.Print(string(bytes.TrimRight([]byte("453gopher8257"), "0123456789")))
+ // Output:
+ // 453gopher
+}
+
+func ExampleTrimRightFunc() {
+ fmt.Println(string(bytes.TrimRightFunc([]byte("go-gopher"), unicode.IsLetter)))
+ fmt.Println(string(bytes.TrimRightFunc([]byte("go-gopher!"), unicode.IsPunct)))
+ fmt.Println(string(bytes.TrimRightFunc([]byte("1234go-gopher!567"), unicode.IsNumber)))
+ // Output:
+ // go-
+ // go-gopher
+ // 1234go-gopher!
+}
+
+func ExampleToUpper() {
+ fmt.Printf("%s", bytes.ToUpper([]byte("Gopher")))
+ // Output: GOPHER
+}
+
+func ExampleToUpperSpecial() {
+ str := []byte("ahoj vývojári golang")
+ totitle := bytes.ToUpperSpecial(unicode.AzeriCase, str)
+ fmt.Println("Original : " + string(str))
+ fmt.Println("ToUpper : " + string(totitle))
+ // Output:
+ // Original : ahoj vývojári golang
+ // ToUpper : AHOJ VÝVOJÁRİ GOLANG
+}
+
+func ExampleToLower() {
+ fmt.Printf("%s", bytes.ToLower([]byte("Gopher")))
+ // Output: gopher
+}
+
+func ExampleToLowerSpecial() {
+ str := []byte("AHOJ VÝVOJÁRİ GOLANG")
+ totitle := bytes.ToLowerSpecial(unicode.AzeriCase, str)
+ fmt.Println("Original : " + string(str))
+ fmt.Println("ToLower : " + string(totitle))
+ // Output:
+ // Original : AHOJ VÝVOJÁRİ GOLANG
+ // ToLower : ahoj vývojári golang
+}
+
+func ExampleReader_Len() {
+ fmt.Println(bytes.NewReader([]byte("Hi!")).Len())
+ fmt.Println(bytes.NewReader([]byte("こんにちは!")).Len())
+ // Output:
+ // 3
+ // 16
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 05:49:34 +0000