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// Copyright (C) 2021 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
#ifndef QQMLJSSOURCELOCATION_P_H
#define QQMLJSSOURCELOCATION_P_H
#include <QtCore/private/qglobal_p.h>
#include <QtCore/qhashfunctions.h>
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
QT_BEGIN_NAMESPACE
namespace QQmlJS {
class SourceLocation
{
// see also Lexer::illegalFileLengthError() and its enforcement in qqmljs.g
static constexpr bool qSizeTypeCanHoldQuint32()
{
return sizeof(qsizetype) > sizeof(quint32);
}
public:
explicit SourceLocation(quint32 offset = 0, quint32 length = 0, quint32 line = 0, quint32 column = 0)
: offset(offset), length(length),
startLine(line), startColumn(column)
{
if constexpr (!qSizeTypeCanHoldQuint32()) {
constexpr quint32 maxLength = quint32(std::numeric_limits<qsizetype>::max());
// note: no overflow when adding offset and length because:
// offset + length <= (maxLength - 1) + (maxLength - 1) = std::numeric_limits<quint32>::max()
Q_ASSERT_X(length < maxLength && offset < maxLength && offset + length < maxLength,
"QQmlJS::SourceLocation", "File size is limited to 2GB!");
Q_ASSERT_X(line < maxLength, "QQmlJS::SourceLocation",
"Line exceeded maxLength of 2^31 - 1");
Q_ASSERT_X(column < maxLength, "QQmlJS::SourceLocation",
"Column exceeded maxLength of 2^31 - 1");
}
}
static SourceLocation fromQSizeType(qsizetype offset, qsizetype length = 0, qsizetype line = 0,
qsizetype column = 0)
{
if constexpr (qSizeTypeCanHoldQuint32()) {
constexpr qsizetype maxLength = qsizetype(std::numeric_limits<quint32>::max());
Q_ASSERT_X(offset + length < maxLength, "QQmlJS::SourceLocation",
"File size is limited to 4GB!");
Q_ASSERT_X(line < maxLength, "QQmlJS::SourceLocation",
"Line exceeded maxLength of 2^32 - 1");
Q_ASSERT_X(column < maxLength, "QQmlJS::SourceLocation",
"Column exceeded maxLength of 2^32 - 1");
}
return SourceLocation(quint32(offset), quint32(length), quint32(line), quint32(column));
}
private:
struct LocationInfo
{
quint32 offset;
quint32 startLine;
quint32 startColumn;
};
template <typename Predicate>
static LocationInfo findLocationIf(QStringView text, Predicate &&predicate,
const SourceLocation &startHint = SourceLocation{})
{
quint32 i = startHint.isValid() ? startHint.offset : 0;
quint32 endLine = startHint.isValid() ? startHint.startLine : 1;
quint32 endColumn = startHint.isValid() ? startHint.startColumn : 1;
const quint32 end = quint32(text.size());
for (; i < end; ++i) {
if (predicate(i, endLine, endColumn))
return LocationInfo{ i, endLine, endColumn };
const QChar currentChar = text.at(i);
const bool isLineFeed = currentChar == u'\n';
const bool isCarriageReturn = currentChar == u'\r';
// note: process the newline on the "\n" part of "\r\n", and treat "\r" as normal
// character
const bool isHalfANewline =
isCarriageReturn && (i + 1 < end && text.at(i + 1) == u'\n');
if (isHalfANewline || (!isCarriageReturn && !isLineFeed)) {
++endColumn;
continue;
}
// catch positions after the end of the line
if (predicate(i, endLine, std::numeric_limits<quint32>::max()))
return LocationInfo{ i, endLine, endColumn };
// catch positions after the end of the file and return the last character of the last
// line
if (i == end - 1) {
if (predicate(i, std::numeric_limits<quint32>::max(),
std::numeric_limits<quint32>::max())) {
return LocationInfo{ i, endLine, endColumn };
}
}
++endLine;
endColumn = 1;
}
// not found, return last position
return LocationInfo{ i, endLine, endColumn };
}
public:
static quint32 offsetFrom(QStringView text, quint32 line, quint32 column,
const SourceLocation &startHint = SourceLocation{})
{
// sanity check that hint can actually be used
const SourceLocation hint =
(startHint.startLine < line
|| (startHint.startLine == line && startHint.startColumn <= column))
? startHint
: SourceLocation{};
const auto result = findLocationIf(
text,
[line, column](quint32, quint32 currentLine, quint32 currentColumn) {
return line <= currentLine && column <= currentColumn;
},
hint);
return result.offset;
}
static std::pair<quint32, quint32>
rowAndColumnFrom(QStringView text, quint32 offset,
const SourceLocation &startHint = SourceLocation{})
{
// sanity check that hint can actually be used
const SourceLocation hint = startHint.offset <= offset ? startHint : SourceLocation{};
const auto result = findLocationIf(
text,
[offset](quint32 currentOffset, quint32, quint32) {
return offset == currentOffset;
},
hint);
return std::make_pair(result.startLine, result.startColumn);
}
bool isValid() const { return *this != SourceLocation(); }
qsizetype begin() const { return qsizetype(offset); }
qsizetype end() const { return qsizetype(offset) + length; }
// Returns a zero length location at the start of the current one.
SourceLocation startZeroLengthLocation() const
{
return SourceLocation(offset, 0, startLine, startColumn);
}
// Returns a zero length location at the end of the current one.
SourceLocation endZeroLengthLocation(QStringView text) const
{
auto [row, column] = rowAndColumnFrom(text, offset + length, *this);
return SourceLocation{ offset + length, 0, row, column };
}
// attributes
// ### encode
// Those quint32 can be casted to qsizetype because the Parser aborts on files with size >=
// std::min(std::numeric_limits<quint32>::max(), std::numeric_limits<qsizetype>::max()).
quint32 offset;
quint32 length;
quint32 startLine;
quint32 startColumn;
friend size_t qHash(const SourceLocation &location, size_t seed = 0)
{
return qHashMulti(seed, location.offset, location.length,
location.startLine, location.startColumn);
}
friend bool operator==(const SourceLocation &a, const SourceLocation &b)
{
return a.offset == b.offset && a.length == b.length
&& a.startLine == b.startLine && a.startColumn == b.startColumn;
}
friend bool operator!=(const SourceLocation &a, const SourceLocation &b) { return !(a == b); }
// Returns a source location starting at the beginning of l1, l2 and ending at the end of them.
// Ignores invalid source locations.
friend SourceLocation combine(const SourceLocation &l1, const SourceLocation &l2) {
quint32 e = qMax(l1.end(), l2.end());
SourceLocation res;
if (l1.offset <= l2.offset)
res = (l1.isValid() ? l1 : l2);
else
res = (l2.isValid() ? l2 : l1);
res.length = e - res.offset;
return res;
}
};
} // namespace QQmlJS
QT_END_NAMESPACE
#endif
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