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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qsvgutils_p.h"
#include <cmath>
QT_BEGIN_NAMESPACE
namespace QSvgUtils {
// '0' is 0x30 and '9' is 0x39
bool isDigit(ushort ch)
{
static quint16 magic = 0x3ff;
return ((ch >> 4) == 3) && (magic >> (ch & 15));
}
qreal toDouble(const QChar *&str)
{
const int maxLen = 255;//technically doubles can go til 308+ but whatever
char temp[maxLen+1];
int pos = 0;
if (*str == QLatin1Char('-')) {
temp[pos++] = '-';
++str;
} else if (*str == QLatin1Char('+')) {
++str;
}
while (isDigit(str->unicode()) && pos < maxLen) {
temp[pos++] = str->toLatin1();
++str;
}
if (*str == QLatin1Char('.') && pos < maxLen) {
temp[pos++] = '.';
++str;
}
while (isDigit(str->unicode()) && pos < maxLen) {
temp[pos++] = str->toLatin1();
++str;
}
bool exponent = false;
if ((*str == QLatin1Char('e') || *str == QLatin1Char('E')) && pos < maxLen) {
exponent = true;
temp[pos++] = 'e';
++str;
if ((*str == QLatin1Char('-') || *str == QLatin1Char('+')) && pos < maxLen) {
temp[pos++] = str->toLatin1();
++str;
}
while (isDigit(str->unicode()) && pos < maxLen) {
temp[pos++] = str->toLatin1();
++str;
}
}
temp[pos] = '\0';
qreal val;
if (!exponent && pos < 10) {
int ival = 0;
const char *t = temp;
bool neg = false;
if (*t == '-') {
neg = true;
++t;
}
while (*t && *t != '.') {
ival *= 10;
ival += (*t) - '0';
++t;
}
if (*t == '.') {
++t;
int div = 1;
while (*t) {
ival *= 10;
ival += (*t) - '0';
div *= 10;
++t;
}
val = ((qreal)ival)/((qreal)div);
} else {
val = ival;
}
if (neg)
val = -val;
} else {
val = QByteArray::fromRawData(temp, pos).toDouble();
// Do not tolerate values too wild to be represented normally by floats
if (qFpClassify(float(val)) != FP_NORMAL)
val = 0;
}
return val;
}
qreal toDouble(QStringView str, bool *ok)
{
const QChar *c = str.constData();
qreal res = (c == nullptr ? qreal{} : toDouble(c));
if (ok)
*ok = (c == (str.constData() + str.size()));
return res;
}
qreal parseLength(QStringView str, LengthType *type, bool *ok)
{
QStringView numStr = str.trimmed();
if (numStr.isEmpty()) {
if (ok)
*ok = false;
*type = LengthType::LT_OTHER;
return false;
}
if (numStr.endsWith(QLatin1Char('%'))) {
numStr.chop(1);
*type = LengthType::LT_PERCENT;
} else if (numStr.endsWith(QLatin1String("px"))) {
numStr.chop(2);
*type = LengthType::LT_PX;
} else if (numStr.endsWith(QLatin1String("pc"))) {
numStr.chop(2);
*type = LengthType::LT_PC;
} else if (numStr.endsWith(QLatin1String("pt"))) {
numStr.chop(2);
*type = LengthType::LT_PT;
} else if (numStr.endsWith(QLatin1String("mm"))) {
numStr.chop(2);
*type = LengthType::LT_MM;
} else if (numStr.endsWith(QLatin1String("cm"))) {
numStr.chop(2);
*type = LengthType::LT_CM;
} else if (numStr.endsWith(QLatin1String("in"))) {
numStr.chop(2);
*type = LengthType::LT_IN;
} else {
// default coordinate system
*type = LengthType::LT_PX;
}
qreal len = toDouble(numStr, ok);
return len;
}
// this should really be called convertToDefaultCoordinateSystem
// and convert when type != QSvgHandler::defaultCoordinateSystem
qreal convertToPixels(qreal len, bool , LengthType type)
{
switch (type) {
case LengthType::LT_PERCENT:
break;
case LengthType::LT_PX:
break;
case LengthType::LT_PC:
break;
case LengthType::LT_PT:
return len * 1.25;
break;
case LengthType::LT_MM:
return len * 3.543307;
break;
case LengthType::LT_CM:
return len * 35.43307;
break;
case LengthType::LT_IN:
return len * 90;
break;
case LengthType::LT_OTHER:
break;
default:
break;
}
return len;
}
};
QT_END_NAMESPACE
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