forked from golang/go
/
main.go
131 lines (108 loc) · 2.35 KB
/
main.go
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package main
import (
"fmt"
"strings"
"unicode/utf8"
)
func HashTest(sep string) (uint32, uint32) {
var pow, sq uint32 = 1, 2
for i := len(sep); i > 0; i >>= 1 {
if i&1 != 0 {
pow *= sq
}
sq *= sq
}
return pow, sq
}
func Replace(s, old, new string, n int) string {
if old == new || n == 0 {
return s // avoid allocation
}
// Compute number of replacements.
if m := strings.Count(s, old); m == 0 {
fmt.Println("...1")
return s // avoid allocation
} else if n < 0 || m < n {
n = m
}
fmt.Println("...3")
// Apply replacements to buffer.
t := make([]byte, len(s)+n*(len(new)-len(old)))
w := 0
start := 0
for i := 0; i < n; i++ {
j := start
if len(old) == 0 {
if i > 0 {
_, wid := utf8.DecodeRuneInString(s[start:])
j += wid
}
} else {
j += strings.Index(s[start:], old)
}
w += copy(t[w:], s[start:j])
w += copy(t[w:], new)
start = j + len(old)
}
w += copy(t[w:], s[start:])
return string(t[0:w])
}
type my interface {
SayHello()
}
func hello(m my) {
m.SayHello()
}
type huluwa struct {
}
func (h huluwa) SayHello() {
fmt.Println("hello huluwa !")
}
func main() {
fmt.Println(strings.Index("chicken", "ken"))
fmt.Println(strings.Index("chicken", "dmr"))
fmt.Println(strings.ContainsAny("team", "e"))
fmt.Println(strings.ContainsAny("failure", "u & i"))
fmt.Println(strings.ContainsAny("foo", ""))
fmt.Println(strings.ContainsAny("", ""))
fmt.Println(1 & 1)
fmt.Println(2 & 1)
fmt.Println(4 & 1)
fmt.Println(5 & 1)
pow, sq := HashTest("1234567")
fmt.Println(pow)
fmt.Println(sq)
str := "df 世 界 asd"
s := "1界"
index := strings.IndexAny(str, "界")
fmt.Printf("%d......\n", index)
for i, c := range str {
fmt.Println(i)
for _, m := range s {
fmt.Printf("%c\t%c\n", c, m)
}
}
for i := len(str); i > 0; {
rune, size := utf8.DecodeLastRuneInString(str[0:i])
fmt.Printf("%v\t", i)
i -= size
for _, m := range s {
fmt.Printf("%c\t%v\t%v\n", rune, size, m)
}
}
fmt.Println("bytes =", len(str))
fmt.Println("runes =", utf8.RuneCountInString(str))
for _, ss := range strings.Fields(str) {
fmt.Println(ss)
}
fmt.Println(strings.ToTitle(str))
str = "Hello, 世界"
// for len(str) > 0 {
// r, size := utf8.DecodeRuneInString(str)
// fmt.Printf("%c %v\n", r, size)
// str = str[size:]
// }
fmt.Println(Replace(str, "", "f", -1))
hulu := new(huluwa)
hello(hulu)
}