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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of jom.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#include "makefilelinereader.h"
#include "helperfunctions.h"
#include <QTextCodec>
#include <QDebug>
namespace NMakeFile {
MakefileLineReader::MakefileLineReader(const QString& filename)
: m_file(filename),
m_nLineBufferSize(m_nInitialLineBufferSize),
m_nLineNumber(0)
{
m_lineBuffer = reinterpret_cast<char*>( malloc(m_nLineBufferSize) );
}
MakefileLineReader::~MakefileLineReader()
{
close();
free(m_lineBuffer);
}
bool MakefileLineReader::open()
{
if (!m_file.open(QIODevice::ReadOnly | QIODevice::Text))
return false;
// check BOM
enum FileEncoding { FCLatin1, FCUTF8, FCUTF16 };
FileEncoding fileEncoding = FCLatin1;
QByteArray buf = m_file.peek(3);
if (buf.startsWith("\xFF\xFE"))
fileEncoding = FCUTF16;
else if (buf.startsWith("\xEF\xBB\xBF"))
fileEncoding = FCUTF8;
if (fileEncoding == FCLatin1) {
m_readLineImpl = &NMakeFile::MakefileLineReader::readLine_impl_local8bit;
} else {
m_readLineImpl = &NMakeFile::MakefileLineReader::readLine_impl_unicode;
m_textStream.setCodec(fileEncoding == FCUTF8 ? "UTF-8" : "UTF-16");
m_textStream.setAutoDetectUnicode(false);
m_textStream.setDevice(&m_file);
}
return true;
}
void MakefileLineReader::close()
{
m_file.close();
}
void MakefileLineReader::growLineBuffer(size_t nGrow)
{
//fprintf(stderr, "realloc %d -> %d\n", m_nLineBufferSize, m_nLineBufferSize + nGrow);
m_nLineBufferSize += nGrow;
m_lineBuffer = reinterpret_cast<char*>(realloc(m_lineBuffer, m_nLineBufferSize));
}
/**
* This function reads lines from a makefile and
* - ignores all lines that start with #
* - combines multi-lines (lines with \ at the end) into a single long line
* - handles the ^ escape character for \ and \n at the end
*/
MakefileLine MakefileLineReader::readLine(bool bInlineFileMode)
{
if (bInlineFileMode) {
m_nLineNumber++;
return MakefileLine{ QString::fromLatin1(m_file.readLine()) };
}
return (this->*m_readLineImpl)();
}
/**
* readLine implementation optimized for 8 bit files.
*/
MakefileLine MakefileLineReader::readLine_impl_local8bit()
{
size_t bytesRead;
do {
m_nLineNumber++;
const qint64 n = m_file.readLine(m_lineBuffer, m_nLineBufferSize - 1);
if (n <= 0)
return {};
bytesRead = n;
while (m_lineBuffer[bytesRead - 1] != '\n') {
if (m_file.atEnd()) {
// The file didn't end with a newline.
// Code below relies on having a trailing newline.
// We're imitating it by increasing the string length.
if (bytesRead >= (m_nLineBufferSize - 2))
growLineBuffer(1);
++bytesRead;
break;
}
growLineBuffer(m_nLineBufferGrowSize);
int moreBytesRead = m_file.readLine(m_lineBuffer + bytesRead, m_nLineBufferSize - 1 - bytesRead);
if (moreBytesRead <= 0)
break;
bytesRead += moreBytesRead;
}
} while (m_lineBuffer[0] == '#');
m_lineBuffer[bytesRead] = '\0';
MakefileLine line;
char* buf = m_lineBuffer;
int bufLength = static_cast<int>(bytesRead);
if (bufLength >= 2 && buf[bufLength - 2] == '\\') {
if (bufLength >= 3 && buf[bufLength - 3] == '^') {
buf[bufLength - 3] = '\\'; // replace "^\\\n" -> "\\\\\n"
bufLength -= 2; // remove "\\\n"
} else {
bufLength -= 2; // remove "\\\n"
line.continuation = LineContinuationType::Backslash;
}
} else if (bufLength >= 2 && buf[bufLength - 2] == '^') {
bufLength -= 2;
line.continuation = LineContinuationType::Caret;
} else {
bufLength--; // remove trailing \n
}
line.content = QString::fromLatin1(buf, bufLength);
return line;
}
/**
* readLine implementation for unicode files.
* Much slower than the 8 bit version.
*/
MakefileLine MakefileLineReader::readLine_impl_unicode()
{
MakefileLine line;
QString str;
do {
m_nLineNumber++;
str = m_textStream.readLine();
} while (str.startsWith(QLatin1Char('#')));
if (str.isNull())
return line;
if (str.endsWith(QLatin1String("^\\"))) {
str.remove(str.length() - 2, 1);
} else if (str.endsWith(QLatin1Char('\\'))) {
str.chop(1);
line.continuation = LineContinuationType::Backslash;
} else if (str.endsWith(QLatin1Char('^'))) {
str.chop(1);
line.continuation = LineContinuationType::Caret;
}
line.content = str;
return line;
}
} // namespace NMakeFile
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