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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "fileout.h"
#include "messages.h"
#include "reporthandler.h"
#include "exception.h"
#include <QtCore/QFileInfo>
#include <QtCore/QDir>
#include <QtCore/QDebug>
#include <cstdio>
bool FileOut::m_dryRun = false;
bool FileOut::m_diff = false;
#ifdef Q_OS_LINUX
static const char colorDelete[] = "\033[31m";
static const char colorAdd[] = "\033[32m";
static const char colorInfo[] = "\033[36m";
static const char colorReset[] = "\033[0m";
#else
static const char colorDelete[] = "";
static const char colorAdd[] = "";
static const char colorInfo[] = "";
static const char colorReset[] = "";
#endif
FileOut::FileOut(QString n) :
stream(&m_buffer),
m_name(std::move(n)),
m_isDone(false)
{
}
FileOut::~FileOut()
{
if (!m_isDone) {
qCWarning(lcShiboken).noquote().nospace() << __FUNCTION__
<< " file " << m_name << " not written.";
}
}
static QList<int> lcsLength(const QByteArrayList &a, const QByteArrayList &b)
{
const int height = a.size() + 1;
const int width = b.size() + 1;
QList<int> res(width * height, 0);
for (int row = 1; row < height; row++) {
for (int col = 1; col < width; col++) {
if (a[row-1] == b[col-1])
res[width * row + col] = res[width * (row-1) + col-1] + 1;
else
res[width * row + col] = qMax(res[width * row + col-1],
res[width * (row-1) + col]);
}
}
return res;
}
enum Type {
Add,
Delete,
Unchanged
};
struct Unit
{
Type type;
int start;
int end;
void print(const QByteArrayList &a, const QByteArrayList &b) const;
};
void Unit::print(const QByteArrayList &a, const QByteArrayList &b) const
{
switch (type) {
case Unchanged:
if ((end - start) > 9) {
for (int i = start; i <= start + 2; i++)
std::printf(" %s\n", a.at(i).constData());
std::printf("%s=\n= %d more lines\n=%s\n",
colorInfo, end - start - 6, colorReset);
for (int i = end - 2; i <= end; i++)
std::printf(" %s\n", a.at(i).constData());
} else {
for (int i = start; i <= end; i++)
std::printf(" %s\n", a.at(i).constData());
}
break;
case Add:
std::fputs(colorAdd, stdout);
for (int i = start; i <= end; i++)
std::printf("+ %s\n", b.at(i).constData());
std::fputs(colorReset, stdout);
break;
case Delete:
std::fputs(colorDelete, stdout);
for (int i = start; i <= end; i++)
std::printf("- %s\n", a.at(i).constData());
std::fputs(colorReset, stdout);
break;
}
}
static void unitAppend(Type type, int pos, QList<Unit> *units)
{
if (!units->isEmpty() && units->last().type == type)
units->last().end = pos;
else
units->append(Unit{type, pos, pos});
}
static QList<Unit> diffHelper(const QList<int> &lcs,
const QByteArrayList &a, const QByteArrayList &b,
int row, int col)
{
if (row > 0 && col > 0 && a.at(row - 1) == b.at(col - 1)) {
QList<Unit> result = diffHelper(lcs, a, b, row - 1, col - 1);
unitAppend(Unchanged, row - 1, &result);
return result;
}
const int width = b.size() + 1;
if (col > 0
&& (row == 0 || lcs.at(width * row + col -1 ) >= lcs.at(width * (row - 1) + col))) {
QList<Unit> result = diffHelper(lcs, a, b, row, col - 1);
unitAppend(Add, col - 1, &result);
return result;
}
if (row > 0
&& (col == 0 || lcs.at(width * row + col-1) < lcs.at(width * (row - 1) + col))) {
QList<Unit> result = diffHelper(lcs, a, b, row - 1, col);
unitAppend(Delete, row - 1, &result);
return result;
}
return {};
}
static void diff(const QByteArrayList &a, const QByteArrayList &b)
{
const QList<Unit> res = diffHelper(lcsLength(a, b), a, b, a.size(), b.size());
for (const Unit &unit : res)
unit.print(a, b);
}
FileOut::State FileOut::done()
{
if (m_isDone)
return Success;
bool fileEqual = false;
QFile fileRead(m_name);
QFileInfo info(fileRead);
stream.flush();
QByteArray original;
if (info.exists() && (m_diff || (info.size() == m_buffer.size()))) {
if (!fileRead.open(QIODevice::ReadOnly))
throw Exception(msgCannotOpenForReading(fileRead));
original = fileRead.readAll();
fileRead.close();
fileEqual = (original == m_buffer);
}
if (fileEqual) {
m_isDone = true;
return Unchanged;
}
if (!FileOut::m_dryRun) {
QDir dir(info.absolutePath());
if (!dir.mkpath(dir.absolutePath())) {
const QString message = QStringLiteral("Unable to create directory '%1'")
.arg(QDir::toNativeSeparators(dir.absolutePath()));
throw Exception(message);
}
QFile fileWrite(m_name);
if (!fileWrite.open(QIODevice::WriteOnly))
throw Exception(msgCannotOpenForWriting(fileWrite));
if (fileWrite.write(m_buffer) == -1 || !fileWrite.flush())
throw Exception(msgWriteFailed(fileWrite, m_buffer.size()));
}
if (m_diff) {
std::printf("%sFile: %s%s\n", colorInfo, qPrintable(m_name), colorReset);
::diff(original.split('\n'), m_buffer.split('\n'));
std::printf("\n");
}
m_isDone = true;
return Success;
}
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