1 | // Copyright (C) 2021 The Qt Company Ltd. |
---|---|
2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0 |
3 | |
4 | #include "openedlist.h" |
5 | |
6 | #include "atom.h" |
7 | |
8 | #include <QtCore/qregularexpression.h> |
9 | |
10 | QT_BEGIN_NAMESPACE |
11 | |
12 | static const char roman[] = "m\2d\5c\2l\5x\2v\5i"; |
13 | |
14 | OpenedList::OpenedList(ListStyle style) : sty(style), ini(1), nex(0) {} |
15 | |
16 | OpenedList::OpenedList(const Location &location, const QString &hint) : sty(Bullet), ini(1) |
17 | { |
18 | static const QRegularExpression hintSyntax("^(\\W*)([0-9]+|[A-Z]+|[a-z]+)(\\W*)$"); |
19 | |
20 | auto match = hintSyntax.match(subject: hint); |
21 | if (match.hasMatch()) { |
22 | bool ok; |
23 | int asNumeric = hint.toInt(ok: &ok); |
24 | int asRoman = fromRoman(str: match.captured(nth: 2)); |
25 | int asAlpha = fromAlpha(str: match.captured(nth: 2)); |
26 | |
27 | if (ok) { |
28 | sty = Numeric; |
29 | ini = asNumeric; |
30 | } else if (asRoman > 0 && asRoman != 100 && asRoman != 500) { |
31 | sty = (hint == hint.toLower()) ? LowerRoman : UpperRoman; |
32 | ini = asRoman; |
33 | } else { |
34 | sty = (hint == hint.toLower()) ? LowerAlpha : UpperAlpha; |
35 | ini = asAlpha; |
36 | } |
37 | pref = match.captured(nth: 1); |
38 | suff = match.captured(nth: 3); |
39 | } else if (!hint.isEmpty()) { |
40 | location.warning(QStringLiteral("Unrecognized list style '%1'").arg(a: hint)); |
41 | } |
42 | nex = ini - 1; |
43 | } |
44 | |
45 | QString OpenedList::styleString() const |
46 | { |
47 | switch (style()) { |
48 | case Bullet: |
49 | default: |
50 | return ATOM_LIST_BULLET; |
51 | case Tag: |
52 | return ATOM_LIST_TAG; |
53 | case Value: |
54 | return ATOM_LIST_VALUE; |
55 | case Numeric: |
56 | return ATOM_LIST_NUMERIC; |
57 | case UpperAlpha: |
58 | return ATOM_LIST_UPPERALPHA; |
59 | case LowerAlpha: |
60 | return ATOM_LIST_LOWERALPHA; |
61 | case UpperRoman: |
62 | return ATOM_LIST_UPPERROMAN; |
63 | case LowerRoman: |
64 | return ATOM_LIST_LOWERROMAN; |
65 | } |
66 | } |
67 | |
68 | QString OpenedList::numberString() const |
69 | { |
70 | return QString::number(number()); |
71 | /* |
72 | switch ( style() ) { |
73 | case Numeric: |
74 | return QString::number( number() ); |
75 | case UpperAlpha: |
76 | return toAlpha( number() ).toUpper(); |
77 | case LowerAlpha: |
78 | return toAlpha( number() ); |
79 | case UpperRoman: |
80 | return toRoman( number() ).toUpper(); |
81 | case LowerRoman: |
82 | return toRoman( number() ); |
83 | case Bullet: |
84 | default: |
85 | return "*"; |
86 | }*/ |
87 | } |
88 | |
89 | int OpenedList::fromAlpha(const QString &str) |
90 | { |
91 | int n = 0; |
92 | int u; |
93 | |
94 | for (const QChar &character : str) { |
95 | u = character.toLower().unicode(); |
96 | if (u >= 'a' && u <= 'z') { |
97 | n *= 26; |
98 | n += u - 'a' + 1; |
99 | } else { |
100 | return 0; |
101 | } |
102 | } |
103 | return n; |
104 | } |
105 | |
106 | QString OpenedList::toRoman(int n) |
107 | { |
108 | /* |
109 | See p. 30 of Donald E. Knuth's "TeX: The Program". |
110 | */ |
111 | QString str; |
112 | int j = 0; |
113 | int k; |
114 | int u; |
115 | int v = 1000; |
116 | |
117 | for (;;) { |
118 | while (n >= v) { |
119 | str += roman[j]; |
120 | n -= v; |
121 | } |
122 | |
123 | if (n <= 0) |
124 | break; |
125 | |
126 | k = j + 2; |
127 | u = v / roman[k - 1]; |
128 | if (roman[k - 1] == 2) { |
129 | k += 2; |
130 | u /= 5; |
131 | } |
132 | if (n + u >= v) { |
133 | str += roman[k]; |
134 | n += u; |
135 | } else { |
136 | j += 2; |
137 | v /= roman[j - 1]; |
138 | } |
139 | } |
140 | return str; |
141 | } |
142 | |
143 | int OpenedList::fromRoman(const QString &str) |
144 | { |
145 | int n = 0; |
146 | int j; |
147 | int u; |
148 | int v = 0; |
149 | |
150 | for (const QChar &character : str) { |
151 | j = 0; |
152 | u = 1000; |
153 | while (roman[j] != 'i' && roman[j] != character.toLower()) { |
154 | j += 2; |
155 | u /= roman[j - 1]; |
156 | } |
157 | if (u < v) { |
158 | n -= u; |
159 | } else { |
160 | n += u; |
161 | } |
162 | v = u; |
163 | } |
164 | |
165 | if (str.toLower() == toRoman(n)) { |
166 | return n; |
167 | } else { |
168 | return 0; |
169 | } |
170 | } |
171 | |
172 | QT_END_NAMESPACE |
173 |