1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
package util
import (
"unicode"
"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 !unicode.IsSpace(char) {
break
}
}
// Completely empty
if i < 0 {
return 0
}
var j int
for j = 0; j < len; j++ {
char := chars.Get(j)
if !unicode.IsSpace(char) {
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 !unicode.IsSpace(char) {
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
}
|