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package stringutil
import (
"bytes"
"regexp"
"unsafe"
"github.com/shenwei356/util/byteutil"
)
// Split splits a byte slice by giveen letters
func Split(slice string, letters string) []string {
result := byteutil.Split([]byte(slice), []byte(letters))
result2 := []string{}
for _, s := range result {
result2 = append(result2, string(s))
}
return result2
}
// Str2Bytes convert string to byte slice. Warning: it's unsafe!!!
func Str2Bytes(s string) []byte {
x := (*[2]uintptr)(unsafe.Pointer(&s))
h := [3]uintptr{x[0], x[1], x[1]}
return *(*[]byte)(unsafe.Pointer(&h))
}
// ReverseStringSlice reverses StringSlice
func ReverseStringSlice(s []string) []string {
// make a copy of s
l := len(s)
t := make([]string, l)
for i := 0; i < l; i++ {
t[i] = s[i]
}
// reverse
for i, j := 0, l-1; i < j; i, j = i+1, j-1 {
t[i], t[j] = t[j], t[i]
}
return t
}
// ReverseStringSliceInplace reverses StringSlice
func ReverseStringSliceInplace(s []string) {
for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
s[i], s[j] = s[j], s[i]
}
}
// EscapeSymbols escape custom symbols
func EscapeSymbols(s, symbols string) string {
m := make(map[rune]struct{})
for _, c := range symbols {
m[c] = struct{}{}
}
var buf bytes.Buffer
var ok bool
for _, c := range s {
if _, ok = m[c]; ok {
buf.WriteByte('\\')
}
buf.WriteRune(c)
}
return buf.String()
}
// UnEscaper returns a function for unescaping string
func UnEscaper() func(s string) string {
var re = regexp.MustCompile(`\\([abfnrtv'"?])`)
var m = map[string]string{
`\a`: "\a",
`\b`: "\b",
`\f`: "\f",
`\n`: "\n",
`\r`: "\r",
`\t`: "\t",
`\v`: "\v",
`\\`: "\\",
`\'`: "'",
`\"`: "\"",
`\?`: "?",
}
var mapping = func(key string) string {
if v, ok := m[key]; ok {
return v
}
return key
}
return func(s string) string {
return re.ReplaceAllStringFunc(s, mapping)
}
}
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