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// Copyright 2013 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 utf8_test
import (
"fmt"
"unicode/utf8"
)
func ExampleDecodeLastRune() {
b := []byte("Hello, 世界")
for len(b) > 0 {
r, size := utf8.DecodeLastRune(b)
fmt.Printf("%c %v\n", r, size)
b = b[:len(b)-size]
}
// Output:
// 界 3
// 世 3
// 1
// , 1
// o 1
// l 1
// l 1
// e 1
// H 1
}
func ExampleDecodeLastRuneInString() {
str := "Hello, 世界"
for len(str) > 0 {
r, size := utf8.DecodeLastRuneInString(str)
fmt.Printf("%c %v\n", r, size)
str = str[:len(str)-size]
}
// Output:
// 界 3
// 世 3
// 1
// , 1
// o 1
// l 1
// l 1
// e 1
// H 1
}
func ExampleDecodeRune() {
b := []byte("Hello, 世界")
for len(b) > 0 {
r, size := utf8.DecodeRune(b)
fmt.Printf("%c %v\n", r, size)
b = b[size:]
}
// Output:
// H 1
// e 1
// l 1
// l 1
// o 1
// , 1
// 1
// 世 3
// 界 3
}
func ExampleDecodeRuneInString() {
str := "Hello, 世界"
for len(str) > 0 {
r, size := utf8.DecodeRuneInString(str)
fmt.Printf("%c %v\n", r, size)
str = str[size:]
}
// Output:
// H 1
// e 1
// l 1
// l 1
// o 1
// , 1
// 1
// 世 3
// 界 3
}
func ExampleEncodeRune() {
r := '世'
buf := make([]byte, 3)
n := utf8.EncodeRune(buf, r)
fmt.Println(buf)
fmt.Println(n)
// Output:
// [228 184 150]
// 3
}
func ExampleEncodeRune_outOfRange() {
runes := []rune{
// Less than 0, out of range.
-1,
// Greater than 0x10FFFF, out of range.
0x110000,
// The Unicode replacement character.
utf8.RuneError,
}
for i, c := range runes {
buf := make([]byte, 3)
size := utf8.EncodeRune(buf, c)
fmt.Printf("%d: %d %[2]s %d\n", i, buf, size)
}
// Output:
// 0: [239 191 189] � 3
// 1: [239 191 189] � 3
// 2: [239 191 189] � 3
}
func ExampleFullRune() {
buf := []byte{228, 184, 150} // 世
fmt.Println(utf8.FullRune(buf))
fmt.Println(utf8.FullRune(buf[:2]))
// Output:
// true
// false
}
func ExampleFullRuneInString() {
str := "世"
fmt.Println(utf8.FullRuneInString(str))
fmt.Println(utf8.FullRuneInString(str[:2]))
// Output:
// true
// false
}
func ExampleRuneCount() {
buf := []byte("Hello, 世界")
fmt.Println("bytes =", len(buf))
fmt.Println("runes =", utf8.RuneCount(buf))
// Output:
// bytes = 13
// runes = 9
}
func ExampleRuneCountInString() {
str := "Hello, 世界"
fmt.Println("bytes =", len(str))
fmt.Println("runes =", utf8.RuneCountInString(str))
// Output:
// bytes = 13
// runes = 9
}
func ExampleRuneLen() {
fmt.Println(utf8.RuneLen('a'))
fmt.Println(utf8.RuneLen('界'))
// Output:
// 1
// 3
}
func ExampleRuneStart() {
buf := []byte("a界")
fmt.Println(utf8.RuneStart(buf[0]))
fmt.Println(utf8.RuneStart(buf[1]))
fmt.Println(utf8.RuneStart(buf[2]))
// Output:
// true
// true
// false
}
func ExampleValid() {
valid := []byte("Hello, 世界")
invalid := []byte{0xff, 0xfe, 0xfd}
fmt.Println(utf8.Valid(valid))
fmt.Println(utf8.Valid(invalid))
// Output:
// true
// false
}
func ExampleValidRune() {
valid := 'a'
invalid := rune(0xfffffff)
fmt.Println(utf8.ValidRune(valid))
fmt.Println(utf8.ValidRune(invalid))
// Output:
// true
// false
}
func ExampleValidString() {
valid := "Hello, 世界"
invalid := string([]byte{0xff, 0xfe, 0xfd})
fmt.Println(utf8.ValidString(valid))
fmt.Println(utf8.ValidString(invalid))
// Output:
// true
// false
}
func ExampleAppendRune() {
buf1 := utf8.AppendRune(nil, 0x10000)
buf2 := utf8.AppendRune([]byte("init"), 0x10000)
fmt.Println(string(buf1))
fmt.Println(string(buf2))
// Output:
// 𐀀
// init𐀀
}