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|
package util
import (
"unicode/utf8"
)
type Chars struct {
runes []rune
bytes []byte
}
// ToChars converts byte array into rune array
func ToChars(bytea []byte) Chars {
var runes []rune
ascii := true
numBytes := len(bytea)
for i := 0; i < numBytes; {
if bytea[i] < utf8.RuneSelf {
if !ascii {
runes = append(runes, rune(bytea[i]))
}
i++
} else {
if ascii {
ascii = false
runes = make([]rune, i, numBytes)
for j := 0; j < i; j++ {
runes[j] = rune(bytea[j])
}
}
r, sz := utf8.DecodeRune(bytea[i:])
i += sz
runes = append(runes, r)
}
}
if ascii {
return Chars{bytes: bytea}
}
return Chars{runes: runes}
}
func RunesToChars(runes []rune) Chars {
return Chars{runes: runes}
}
func (chars *Chars) Get(i int) rune {
if chars.runes != nil {
return chars.runes[i]
}
return rune(chars.bytes[i])
}
func (chars *Chars) Length() int {
if chars.runes != nil {
return len(chars.runes)
}
return len(chars.bytes)
}
// TrimLength returns the length after trimming leading and trailing whitespaces
func (chars *Chars) TrimLength() int {
var i int
len := chars.Length()
for i = len - 1; i >= 0; i-- {
char := chars.Get(i)
if char != ' ' && char != '\t' {
break
}
}
// Completely empty
if i < 0 {
return 0
}
var j int
for j = 0; j < len; j++ {
char := chars.Get(j)
if char != ' ' && char != '\t' {
break
}
}
return i - j + 1
}
func (chars *Chars) TrailingWhitespaces() int {
whitespaces := 0
for i := chars.Length() - 1; i >= 0; i-- {
char := chars.Get(i)
if char != ' ' && char != '\t' {
break
}
whitespaces++
}
return whitespaces
}
func (chars *Chars) ToString() string {
if chars.runes != nil {
return string(chars.runes)
}
return string(chars.bytes)
}
func (chars *Chars) ToRunes() []rune {
if chars.runes != nil {
return chars.runes
}
runes := make([]rune, len(chars.bytes))
for idx, b := range chars.bytes {
runes[idx] = rune(b)
}
return runes
}
func (chars *Chars) Slice(b int, e int) Chars {
if chars.runes != nil {
return Chars{runes: chars.runes[b:e]}
}
return Chars{bytes: chars.bytes[b:e]}
}
func (chars *Chars) Split(delimiter string) []Chars {
delim := []rune(delimiter)
numChars := chars.Length()
numDelim := len(delim)
begin := 0
ret := make([]Chars, 0, 1)
for index := 0; index < numChars; {
if index+numDelim <= numChars {
match := true
for off, d := range delim {
if chars.Get(index+off) != d {
match = false
break
}
}
// Found the delimiter
if match {
incr := Max(numDelim, 1)
ret = append(ret, chars.Slice(begin, index+incr))
index += incr
begin = index
continue
}
} else {
// Impossible to find the delimiter in the remaining substring
break
}
index++
}
if begin < numChars || len(ret) == 0 {
ret = append(ret, chars.Slice(begin, numChars))
}
return ret
}
|
