mirror of git://gcc.gnu.org/git/gcc.git
289 lines
6.9 KiB
Go
289 lines
6.9 KiB
Go
// Copyright 2011 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 bytes_test
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import (
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"bytes"
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"encoding/base64"
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"fmt"
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"io"
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"os"
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"sort"
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"unicode"
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)
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func ExampleBuffer() {
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var b bytes.Buffer // A Buffer needs no initialization.
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b.Write([]byte("Hello "))
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fmt.Fprintf(&b, "world!")
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b.WriteTo(os.Stdout)
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// Output: Hello world!
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}
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func ExampleBuffer_reader() {
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// A Buffer can turn a string or a []byte into an io.Reader.
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buf := bytes.NewBufferString("R29waGVycyBydWxlIQ==")
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dec := base64.NewDecoder(base64.StdEncoding, buf)
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io.Copy(os.Stdout, dec)
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// Output: Gophers rule!
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}
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func ExampleCompare() {
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// Interpret Compare's result by comparing it to zero.
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var a, b []byte
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if bytes.Compare(a, b) < 0 {
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// a less b
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}
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if bytes.Compare(a, b) <= 0 {
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// a less or equal b
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}
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if bytes.Compare(a, b) > 0 {
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// a greater b
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}
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if bytes.Compare(a, b) >= 0 {
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// a greater or equal b
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}
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// Prefer Equal to Compare for equality comparisons.
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if bytes.Equal(a, b) {
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// a equal b
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}
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if !bytes.Equal(a, b) {
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// a not equal b
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}
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}
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func ExampleCompare_search() {
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// Binary search to find a matching byte slice.
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var needle []byte
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var haystack [][]byte // Assume sorted
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i := sort.Search(len(haystack), func(i int) bool {
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// Return haystack[i] >= needle.
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return bytes.Compare(haystack[i], needle) >= 0
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})
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if i < len(haystack) && bytes.Equal(haystack[i], needle) {
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// Found it!
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}
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}
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func ExampleTrimSuffix() {
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var b = []byte("Hello, goodbye, etc!")
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b = bytes.TrimSuffix(b, []byte("goodbye, etc!"))
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b = bytes.TrimSuffix(b, []byte("gopher"))
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b = append(b, bytes.TrimSuffix([]byte("world!"), []byte("x!"))...)
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os.Stdout.Write(b)
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// Output: Hello, world!
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}
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func ExampleTrimPrefix() {
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var b = []byte("Goodbye,, world!")
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b = bytes.TrimPrefix(b, []byte("Goodbye,"))
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b = bytes.TrimPrefix(b, []byte("See ya,"))
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fmt.Printf("Hello%s", b)
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// Output: Hello, world!
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}
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func ExampleFields() {
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fmt.Printf("Fields are: %q", bytes.Fields([]byte(" foo bar baz ")))
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// Output: Fields are: ["foo" "bar" "baz"]
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}
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func ExampleFieldsFunc() {
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f := func(c rune) bool {
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return !unicode.IsLetter(c) && !unicode.IsNumber(c)
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}
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fmt.Printf("Fields are: %q", bytes.FieldsFunc([]byte(" foo1;bar2,baz3..."), f))
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// Output: Fields are: ["foo1" "bar2" "baz3"]
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}
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func ExampleContains() {
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fmt.Println(bytes.Contains([]byte("seafood"), []byte("foo")))
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fmt.Println(bytes.Contains([]byte("seafood"), []byte("bar")))
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fmt.Println(bytes.Contains([]byte("seafood"), []byte("")))
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fmt.Println(bytes.Contains([]byte(""), []byte("")))
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// Output:
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// true
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// false
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// true
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// true
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}
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func ExampleCount() {
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fmt.Println(bytes.Count([]byte("cheese"), []byte("e")))
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fmt.Println(bytes.Count([]byte("five"), []byte(""))) // before & after each rune
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// Output:
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// 3
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// 5
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}
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func ExampleEqualFold() {
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fmt.Println(bytes.EqualFold([]byte("Go"), []byte("go")))
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// Output: true
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}
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func ExampleHasPrefix() {
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fmt.Println(bytes.HasPrefix([]byte("Gopher"), []byte("Go")))
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fmt.Println(bytes.HasPrefix([]byte("Gopher"), []byte("C")))
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fmt.Println(bytes.HasPrefix([]byte("Gopher"), []byte("")))
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// Output:
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// true
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// false
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// true
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}
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func ExampleHasSuffix() {
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fmt.Println(bytes.HasSuffix([]byte("Amigo"), []byte("go")))
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fmt.Println(bytes.HasSuffix([]byte("Amigo"), []byte("O")))
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fmt.Println(bytes.HasSuffix([]byte("Amigo"), []byte("Ami")))
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fmt.Println(bytes.HasSuffix([]byte("Amigo"), []byte("")))
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// Output:
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// true
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// false
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// false
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// true
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}
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func ExampleIndex() {
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fmt.Println(bytes.Index([]byte("chicken"), []byte("ken")))
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fmt.Println(bytes.Index([]byte("chicken"), []byte("dmr")))
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// Output:
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// 4
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// -1
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}
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func ExampleIndexFunc() {
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f := func(c rune) bool {
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return unicode.Is(unicode.Han, c)
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}
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fmt.Println(bytes.IndexFunc([]byte("Hello, 世界"), f))
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fmt.Println(bytes.IndexFunc([]byte("Hello, world"), f))
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// Output:
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// 7
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// -1
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}
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func ExampleIndexAny() {
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fmt.Println(bytes.IndexAny([]byte("chicken"), "aeiouy"))
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fmt.Println(bytes.IndexAny([]byte("crwth"), "aeiouy"))
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// Output:
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// 2
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// -1
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}
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func ExampleIndexRune() {
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fmt.Println(bytes.IndexRune([]byte("chicken"), 'k'))
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fmt.Println(bytes.IndexRune([]byte("chicken"), 'd'))
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// Output:
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// 4
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// -1
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}
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func ExampleLastIndex() {
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fmt.Println(bytes.Index([]byte("go gopher"), []byte("go")))
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fmt.Println(bytes.LastIndex([]byte("go gopher"), []byte("go")))
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fmt.Println(bytes.LastIndex([]byte("go gopher"), []byte("rodent")))
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// Output:
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// 0
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// 3
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// -1
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}
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func ExampleJoin() {
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s := [][]byte{[]byte("foo"), []byte("bar"), []byte("baz")}
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fmt.Printf("%s", bytes.Join(s, []byte(", ")))
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// Output: foo, bar, baz
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}
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func ExampleRepeat() {
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fmt.Printf("ba%s", bytes.Repeat([]byte("na"), 2))
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// Output: banana
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}
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func ExampleReplace() {
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fmt.Printf("%s\n", bytes.Replace([]byte("oink oink oink"), []byte("k"), []byte("ky"), 2))
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fmt.Printf("%s\n", bytes.Replace([]byte("oink oink oink"), []byte("oink"), []byte("moo"), -1))
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// Output:
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// oinky oinky oink
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// moo moo moo
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}
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func ExampleSplit() {
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fmt.Printf("%q\n", bytes.Split([]byte("a,b,c"), []byte(",")))
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fmt.Printf("%q\n", bytes.Split([]byte("a man a plan a canal panama"), []byte("a ")))
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fmt.Printf("%q\n", bytes.Split([]byte(" xyz "), []byte("")))
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fmt.Printf("%q\n", bytes.Split([]byte(""), []byte("Bernardo O'Higgins")))
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// Output:
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// ["a" "b" "c"]
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// ["" "man " "plan " "canal panama"]
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// [" " "x" "y" "z" " "]
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// [""]
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}
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func ExampleSplitN() {
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fmt.Printf("%q\n", bytes.SplitN([]byte("a,b,c"), []byte(","), 2))
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z := bytes.SplitN([]byte("a,b,c"), []byte(","), 0)
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fmt.Printf("%q (nil = %v)\n", z, z == nil)
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// Output:
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// ["a" "b,c"]
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// [] (nil = true)
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}
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func ExampleSplitAfter() {
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fmt.Printf("%q\n", bytes.SplitAfter([]byte("a,b,c"), []byte(",")))
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// Output: ["a," "b," "c"]
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}
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func ExampleSplitAfterN() {
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fmt.Printf("%q\n", bytes.SplitAfterN([]byte("a,b,c"), []byte(","), 2))
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// Output: ["a," "b,c"]
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}
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func ExampleTitle() {
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fmt.Printf("%s", bytes.Title([]byte("her royal highness")))
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// Output: Her Royal Highness
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}
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func ExampleToTitle() {
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fmt.Printf("%s\n", bytes.ToTitle([]byte("loud noises")))
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fmt.Printf("%s\n", bytes.ToTitle([]byte("хлеб")))
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// Output:
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// LOUD NOISES
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// ХЛЕБ
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}
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func ExampleTrim() {
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fmt.Printf("[%q]", bytes.Trim([]byte(" !!! Achtung! Achtung! !!! "), "! "))
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// Output: ["Achtung! Achtung"]
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}
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func ExampleMap() {
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rot13 := func(r rune) rune {
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switch {
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case r >= 'A' && r <= 'Z':
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return 'A' + (r-'A'+13)%26
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case r >= 'a' && r <= 'z':
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return 'a' + (r-'a'+13)%26
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}
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return r
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}
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fmt.Printf("%s", bytes.Map(rot13, []byte("'Twas brillig and the slithy gopher...")))
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// Output: 'Gjnf oevyyvt naq gur fyvgul tbcure...
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}
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func ExampleTrimSpace() {
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fmt.Printf("%s", bytes.TrimSpace([]byte(" \t\n a lone gopher \n\t\r\n")))
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// Output: a lone gopher
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}
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func ExampleToUpper() {
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fmt.Printf("%s", bytes.ToUpper([]byte("Gopher")))
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// Output: GOPHER
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}
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func ExampleToLower() {
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fmt.Printf("%s", bytes.ToLower([]byte("Gopher")))
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// Output: gopher
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}
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