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
|
#include <QStringList>
#include "track/tracknumbers.h"
#include "util/assert.h"
/*static*/ constexpr int TrackNumbers::kValueUndefined;
/*static*/ constexpr int TrackNumbers::kValueMin;
/*static*/ const QString TrackNumbers::kSeparator("/");
//static
bool TrackNumbers::parseValueFromString(
const QString& str,
int* pValue) {
bool valid = false;
int value = str.toInt(&valid);
if (valid) {
if (nullptr != pValue) {
*pValue = value;
}
}
return valid;
}
//static
TrackNumbers::ParseResult TrackNumbers::parseFromStrings(
const QString& actualText,
const QString& totalText,
TrackNumbers* pParsed) {
const QString actualTrimmed(actualText.trimmed());
const QString totalTrimmed(totalText.trimmed());
ParseResult parseResult =
(actualTrimmed.isEmpty() && totalTrimmed.isEmpty()) ? ParseResult::EMPTY : ParseResult::VALID;
int actualValue = kValueUndefined;
if (!actualTrimmed.isEmpty()) {
if (!parseValueFromString(actualTrimmed, &actualValue) ||
!isValidValue(actualValue)) {
parseResult = ParseResult::INVALID;
}
}
if (nullptr != pParsed) {
pParsed->setActual(actualValue);
}
int totalValue = kValueUndefined;
if (!totalTrimmed.isEmpty()) {
if (!parseValueFromString(totalTrimmed, &totalValue) ||
!isValidValue(totalValue)) {
parseResult = ParseResult::INVALID;
}
}
if (nullptr != pParsed) {
pParsed->setTotal(totalValue);
}
return parseResult;
}
//static
TrackNumbers::ParseResult TrackNumbers::parseFromString(
const QString& str,
TrackNumbers* pParsed) {
QString actualText;
QString totalText;
TrackNumbers::splitString(str, &actualText, &totalText);
return parseFromStrings(actualText, totalText, pParsed);
}
//static
void TrackNumbers::splitString(
QString str,
QString* pActualText,
QString* pTotalText) {
// NOTE(uklotzde): The input string must be passed by value and
// not by const-ref! Otherwise pointer aliasing may occur if one
// of the output parameters points to the same string!
//
// QString trackNumber = ...; // contains the string to be split
// QString trackTotal; // initially empty
// TrackNumbers::splitString(trackNumber, &trackNumber, &trackTotal);
//
// It's perfectly legal if a caller passes a string for splitting
// that in turn receives the actual track number.
const int splitIndex = str.indexOf(kSeparator);
if (0 <= splitIndex) {
if (nullptr != pActualText) {
*pActualText = str.left(splitIndex);
}
if (nullptr != pTotalText) {
*pTotalText = str.right(str.length() - (splitIndex + 1));
}
} else {
if (nullptr != pActualText) {
*pActualText = str;
}
if (nullptr != pTotalText) {
pTotalText->clear();
}
}
}
//static
QString TrackNumbers::joinStrings(
const QString& actualText,
const QString& totalText) {
if (totalText.isEmpty()) {
return actualText;
} else {
return actualText + kSeparator + totalText;
}
}
void TrackNumbers::toStrings(
QString* pActualText,
QString* pTotalText) const {
QString actualText;
if (hasActual() && isActualValid()) {
actualText = QString::number(getActual());
}
QString totalText;
if (hasTotal() && isTotalValid()) {
totalText = QString::number(getTotal());
}
if (!totalText.isEmpty()) {
// Padding with '0' of the actual track number string
// to match the string length of the total track number,
// e.g. actual=3 and total=12 becomes actualText="03"
// and totalText="12".
if (actualText.size() < totalText.size()) {
const QString padding(totalText.size() - actualText.size(), '0');
actualText = padding + actualText;
}
}
if (nullptr != pActualText) {
*pActualText = actualText;
}
if (nullptr != pTotalText) {
*pTotalText = totalText;
}
}
QString TrackNumbers::toString() const {
QString actualText;
QString totalText;
toStrings(&actualText, &totalText);
return joinStrings(actualText, totalText);
}
|
