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QString: towards QStringView::arg() pt.2: port internal machinery to QStringView

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This involves replacing the use of QStringRef with QStringView and
replacing int indexes and sizes with qsizetype ones.

Since we use QStringView now, where mid() is cheap and well-defined,
remove the offset and length parameters that used to be Part ctor
arguments, and use mid() in the caller.

Change-Id: I08f3cd467b7b935f734b73d15eb8564b7deaa87e
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Marc Mutz 2019-06-03 11:43:24 +02:00
parent 54bf20af5d
commit a44a3a4999
1 changed files with 24 additions and 24 deletions
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48
src/corelib/tools/qstring.cpp
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@ -8797,7 +8797,7 @@ QString QString::arg(double a, int fieldWidth, char fmt, int prec, QChar fillCha
return replaceArgEscapes(*this, d, fieldWidth, arg, locale_arg, fillChar);
}
static int getEscape(const QChar *uc, int *pos, int len, int maxNumber = 999)
static int getEscape(const QChar *uc, qsizetype *pos, qsizetype len, int maxNumber = 999)
{
int i = *pos;
++i;
@ -8860,17 +8860,17 @@ static int getEscape(const QChar *uc, int *pos, int len, int maxNumber = 999)
namespace {
struct Part
{
Part() : stringRef(), number(0) {}
Part(const QString &s, int pos, int len, int num = -1) noexcept
: stringRef(&s, pos, len), number(num) {}
Q_DECL_CONSTEXPR Part() : string{}, number{0} {}
Q_DECL_CONSTEXPR Part(QStringView s, int num = -1)
: string{s}, number{num} {}
QStringRef stringRef;
QStringView string;
int number;
};
} // unnamed namespace
template <>
class QTypeInfo<Part> : public QTypeInfoMerger<Part, QStringRef, int> {}; // Q_DECLARE_METATYPE
class QTypeInfo<Part> : public QTypeInfoMerger<Part, QStringView, int> {}; // Q_DECLARE_METATYPE
namespace {
@ -8880,24 +8880,24 @@ enum { ExpectedParts = 32 };
typedef QVarLengthArray<Part, ExpectedParts> ParseResult;
typedef QVarLengthArray<int, ExpectedParts/2> ArgIndexToPlaceholderMap;
static ParseResult parseMultiArgFormatString(const QString &s)
static ParseResult parseMultiArgFormatString(QStringView s)
{
ParseResult result;
const QChar *uc = s.constData();
const int len = s.size();
const int end = len - 1;
int i = 0;
int last = 0;
const auto uc = s.data();
const auto len = s.size();
const auto end = len - 1;
qsizetype i = 0;
qsizetype last = 0;
while (i < end) {
if (uc[i] == QLatin1Char('%')) {
int percent = i;
qsizetype percent = i;
int number = getEscape(uc, &i, len);
if (number != -1) {
if (last != percent)
result.push_back(Part(s, last, percent - last)); // literal text (incl. failed placeholders)
result.push_back(Part(s, percent, i - percent, number)); // parsed placeholder
result.push_back(Part{s.mid(last, percent - last)}); // literal text (incl. failed placeholders)
result.push_back(Part{s.mid(percent, i - percent), number}); // parsed placeholder
last = i;
continue;
}
@ -8906,7 +8906,7 @@ static ParseResult parseMultiArgFormatString(const QString &s)
}
if (last < len)
result.push_back(Part(s, last, len - last)); // trailing literal text
result.push_back(Part{s.mid(last, len - last)}); // trailing literal text
return result;
}
@ -8927,16 +8927,16 @@ static ArgIndexToPlaceholderMap makeArgIndexToPlaceholderMap(const ParseResult &
return result;
}
static int resolveStringRefsAndReturnTotalSize(ParseResult &parts, const ArgIndexToPlaceholderMap &argIndexToPlaceholderMap, const QString *args[])
static qsizetype resolveStringRefsAndReturnTotalSize(ParseResult &parts, const ArgIndexToPlaceholderMap &argIndexToPlaceholderMap, const QString *args[])
{
int totalSize = 0;
qsizetype totalSize = 0;
for (Part &part : parts) {
if (part.number != -1) {
const auto it = std::find(argIndexToPlaceholderMap.begin(), argIndexToPlaceholderMap.end(), part.number);
if (it != argIndexToPlaceholderMap.end())
part.stringRef = QStringRef(args[it - argIndexToPlaceholderMap.begin()]);
part.string = *args[it - argIndexToPlaceholderMap.begin()];
}
totalSize += part.stringRef.size();
totalSize += part.string.size();
}
return totalSize;
}
@ -8946,7 +8946,7 @@ static int resolveStringRefsAndReturnTotalSize(ParseResult &parts, const ArgInde
QString QString::multiArg(int numArgs, const QString **args) const
{
// Step 1-2 above
ParseResult parts = parseMultiArgFormatString(*this);
ParseResult parts = parseMultiArgFormatString(qToStringViewIgnoringNull(*this));
// 3-4
ArgIndexToPlaceholderMap argIndexToPlaceholderMap = makeArgIndexToPlaceholderMap(parts);
@ -8958,15 +8958,15 @@ QString QString::multiArg(int numArgs, const QString **args) const
numArgs - argIndexToPlaceholderMap.size(), toLocal8Bit().data());
// 5
const int totalSize = resolveStringRefsAndReturnTotalSize(parts, argIndexToPlaceholderMap, args);
const qsizetype totalSize = resolveStringRefsAndReturnTotalSize(parts, argIndexToPlaceholderMap, args);
// 6:
QString result(totalSize, Qt::Uninitialized);
auto out = const_cast<QChar*>(result.constData());
for (Part part : parts) {
if (const int sz = part.stringRef.size()) {
memcpy(out, part.stringRef.data(), sz * sizeof(QChar));
if (const qsizetype sz = part.string.size()) {
memcpy(out, part.string.data(), sz * sizeof(QChar));
out += sz;
}
}