patrick
/
plasp
Archived
1
0
Fork 0
This repository has been archived on 2023-07-19. You can view files and clone it, but cannot push or open issues or pull requests.
plasp/src/plasp/input/Stream.cpp

165 lines
3.9 KiB
C++
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

#include <plasp/input/Stream.h>
#include <fstream>
#include <plasp/input/ParserException.h>
namespace plasp
{
namespace input
{
////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Stream
//
////////////////////////////////////////////////////////////////////////////////////////////////////
Stream::Stream()
{
std::setlocale(LC_NUMERIC, "C");
// Dont skip whitespace
m_stream.exceptions(std::istream::badbit);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
Stream::Stream(std::string streamName, std::istream &istream)
{
read(streamName, istream);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
void Stream::read(std::string streamName, std::istream &istream)
{
// Store position of new section
const auto position = m_stream.tellp();
m_delimiters.push_back({position, streamName});
m_stream << istream.rdbuf();
}
////////////////////////////////////////////////////////////////////////////////////////////////////
void Stream::read(const boost::filesystem::path &path)
{
if (!boost::filesystem::is_regular_file(path))
throw std::runtime_error("File does not exist: “" + path.string() + "");
std::ifstream fileStream(path.string(), std::ios::in);
read(path.string(), fileStream);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
void Stream::reset()
{
m_stream.clear();
seek(0);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
void Stream::seek(Position position)
{
m_stream.clear();
m_stream.seekg(position);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
typename Stream::Position Stream::position() const
{
return m_stream.tellg();
}
////////////////////////////////////////////////////////////////////////////////////////////////////
Location Stream::location() const
{
const auto currentPosition = position();
// Find current section
auto currentFile = std::find_if(m_delimiters.crbegin(), m_delimiters.crend(),
[&](const auto &fileDelimiter)
{
return currentPosition >= fileDelimiter.position;
});
// If the parser is at the end of the stream, still count from the beginning of the last section
if (currentFile == m_delimiters.crend())
currentFile = m_delimiters.crbegin();
// Go back to beginning of section
m_stream.clear();
m_stream.seekg(currentFile->position);
size_t row = 1;
size_t column = 1;
// Compute the location character by character
while (true)
{
if (currentPosition == -1 && atEnd())
break;
else if (currentPosition >= 0 && position() >= currentPosition)
break;
const auto character = currentCharacter();
if (character == '\n')
{
row++;
column = 1;
}
else if (std::isblank(character) || std::isprint(character))
column++;
m_stream.ignore(1);
}
return {currentFile->sectionName.c_str(), currentFile->sectionName.c_str(), row, row, column, column};
}
////////////////////////////////////////////////////////////////////////////////////////////////////
char Stream::currentCharacter() const
{
return m_stream.peek();
}
////////////////////////////////////////////////////////////////////////////////////////////////////
bool Stream::atEnd() const
{
return position() == -1;
}
////////////////////////////////////////////////////////////////////////////////////////////////////
void Stream::check() const
{
if (atEnd())
throw ParserException(location(), "reading past end of file");
if (m_stream.fail())
throw ParserException(location());
}
////////////////////////////////////////////////////////////////////////////////////////////////////
void Stream::advance()
{
check();
m_stream.ignore(1);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
}
}