mirror of
https://github.com/Llewellynvdm/fzf.git
synced 2024-09-28 05:09:02 +00:00
158 lines
2.8 KiB
Go
158 lines
2.8 KiB
Go
package util
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import (
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"unicode"
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"unicode/utf8"
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)
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type Chars struct {
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runes []rune
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bytes []byte
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}
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// ToChars converts byte array into rune array
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func ToChars(bytea []byte) Chars {
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var runes []rune
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ascii := true
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numBytes := len(bytea)
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for i := 0; i < numBytes; {
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if bytea[i] < utf8.RuneSelf {
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if !ascii {
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runes = append(runes, rune(bytea[i]))
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}
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i++
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} else {
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if ascii {
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ascii = false
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runes = make([]rune, i, numBytes)
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for j := 0; j < i; j++ {
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runes[j] = rune(bytea[j])
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}
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}
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r, sz := utf8.DecodeRune(bytea[i:])
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i += sz
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runes = append(runes, r)
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}
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}
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if ascii {
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return Chars{bytes: bytea}
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}
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return Chars{runes: runes}
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}
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func RunesToChars(runes []rune) Chars {
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return Chars{runes: runes}
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}
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func (chars *Chars) Get(i int) rune {
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if chars.runes != nil {
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return chars.runes[i]
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}
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return rune(chars.bytes[i])
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}
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func (chars *Chars) Length() int {
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if chars.runes != nil {
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return len(chars.runes)
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}
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return len(chars.bytes)
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}
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// TrimLength returns the length after trimming leading and trailing whitespaces
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func (chars *Chars) TrimLength() int {
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var i int
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len := chars.Length()
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for i = len - 1; i >= 0; i-- {
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char := chars.Get(i)
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if !unicode.IsSpace(char) {
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break
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}
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}
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// Completely empty
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if i < 0 {
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return 0
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}
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var j int
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for j = 0; j < len; j++ {
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char := chars.Get(j)
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if !unicode.IsSpace(char) {
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break
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}
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}
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return i - j + 1
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}
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func (chars *Chars) TrailingWhitespaces() int {
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whitespaces := 0
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for i := chars.Length() - 1; i >= 0; i-- {
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char := chars.Get(i)
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if !unicode.IsSpace(char) {
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break
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}
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whitespaces++
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}
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return whitespaces
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}
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func (chars *Chars) ToString() string {
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if chars.runes != nil {
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return string(chars.runes)
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}
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return string(chars.bytes)
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}
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func (chars *Chars) ToRunes() []rune {
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if chars.runes != nil {
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return chars.runes
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}
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runes := make([]rune, len(chars.bytes))
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for idx, b := range chars.bytes {
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runes[idx] = rune(b)
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}
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return runes
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}
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func (chars *Chars) Slice(b int, e int) Chars {
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if chars.runes != nil {
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return Chars{runes: chars.runes[b:e]}
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}
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return Chars{bytes: chars.bytes[b:e]}
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}
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func (chars *Chars) Split(delimiter string) []Chars {
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delim := []rune(delimiter)
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numChars := chars.Length()
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numDelim := len(delim)
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begin := 0
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ret := make([]Chars, 0, 1)
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for index := 0; index < numChars; {
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if index+numDelim <= numChars {
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match := true
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for off, d := range delim {
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if chars.Get(index+off) != d {
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match = false
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break
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}
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}
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// Found the delimiter
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if match {
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incr := Max(numDelim, 1)
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ret = append(ret, chars.Slice(begin, index+incr))
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index += incr
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begin = index
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continue
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}
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} else {
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// Impossible to find the delimiter in the remaining substring
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break
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}
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index++
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}
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if begin < numChars || len(ret) == 0 {
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ret = append(ret, chars.Slice(begin, numChars))
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}
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return ret
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}
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