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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "openedlist.h"
#include "atom.h"
#include <QtCore/qregularexpression.h>
QT_BEGIN_NAMESPACE
static const char roman[] = "m\2d\5c\2l\5x\2v\5i";
OpenedList::OpenedList(ListStyle style) : sty(style), ini(1), nex(0) {}
OpenedList::OpenedList(const Location &location, const QString &hint) : sty(Bullet), ini(1)
{
static const QRegularExpression hintSyntax("^(\\W*)([0-9]+|[A-Z]+|[a-z]+)(\\W*)$");
auto match = hintSyntax.match(hint);
if (match.hasMatch()) {
bool ok;
int asNumeric = hint.toInt(&ok);
int asRoman = fromRoman(match.captured(2));
int asAlpha = fromAlpha(match.captured(2));
if (ok) {
sty = Numeric;
ini = asNumeric;
} else if (asRoman > 0 && asRoman != 100 && asRoman != 500) {
sty = (hint == hint.toLower()) ? LowerRoman : UpperRoman;
ini = asRoman;
} else {
sty = (hint == hint.toLower()) ? LowerAlpha : UpperAlpha;
ini = asAlpha;
}
pref = match.captured(1);
suff = match.captured(3);
} else if (!hint.isEmpty()) {
location.warning(QStringLiteral("Unrecognized list style '%1'").arg(hint));
}
nex = ini - 1;
}
QString OpenedList::styleString() const
{
switch (style()) {
case Bullet:
default:
return ATOM_LIST_BULLET;
case Tag:
return ATOM_LIST_TAG;
case Value:
return ATOM_LIST_VALUE;
case Numeric:
return ATOM_LIST_NUMERIC;
case UpperAlpha:
return ATOM_LIST_UPPERALPHA;
case LowerAlpha:
return ATOM_LIST_LOWERALPHA;
case UpperRoman:
return ATOM_LIST_UPPERROMAN;
case LowerRoman:
return ATOM_LIST_LOWERROMAN;
}
}
QString OpenedList::numberString() const
{
return QString::number(number());
/*
switch ( style() ) {
case Numeric:
return QString::number( number() );
case UpperAlpha:
return toAlpha( number() ).toUpper();
case LowerAlpha:
return toAlpha( number() );
case UpperRoman:
return toRoman( number() ).toUpper();
case LowerRoman:
return toRoman( number() );
case Bullet:
default:
return "*";
}*/
}
int OpenedList::fromAlpha(const QString &str)
{
int n = 0;
int u;
for (const QChar &character : str) {
u = character.toLower().unicode();
if (u >= 'a' && u <= 'z') {
n *= 26;
n += u - 'a' + 1;
} else {
return 0;
}
}
return n;
}
QString OpenedList::toRoman(int n)
{
/*
See p. 30 of Donald E. Knuth's "TeX: The Program".
*/
QString str;
int j = 0;
int k;
int u;
int v = 1000;
for (;;) {
while (n >= v) {
str += roman[j];
n -= v;
}
if (n <= 0)
break;
k = j + 2;
u = v / roman[k - 1];
if (roman[k - 1] == 2) {
k += 2;
u /= 5;
}
if (n + u >= v) {
str += roman[k];
n += u;
} else {
j += 2;
v /= roman[j - 1];
}
}
return str;
}
int OpenedList::fromRoman(const QString &str)
{
int n = 0;
int j;
int u;
int v = 0;
for (const QChar &character : str) {
j = 0;
u = 1000;
while (roman[j] != 'i' && roman[j] != character.toLower()) {
j += 2;
u /= roman[j - 1];
}
if (u < v) {
n -= u;
} else {
n += u;
}
v = u;
}
if (str.toLower() == toRoman(n)) {
return n;
} else {
return 0;
}
}
QT_END_NAMESPACE
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