Error readStringFromFile(
const core::FilePath& filePath,
const Filter& filter,
std::string* pContents,
string_utils::LineEnding lineEnding=string_utils::LineEndingPassthrough)
{
try
{
// open the file stream (report errors with exceptions)
boost::shared_ptr<std::istream> pIfs;
Error error = filePath.open_r(&pIfs);
if (error)
return error;
pIfs->exceptions(std::istream::failbit | std::istream::badbit);
// output string stream (report errors with exceptions)
std::stringstream ostr;
ostr.exceptions(std::ostream::failbit | std::ostream::badbit);
// do the copy
boost::iostreams::filtering_ostream filteringOStream ;
filteringOStream.push(filter);
filteringOStream.push(ostr);
boost::iostreams::copy(*pIfs, filteringOStream, 128);
// return contents with requested line endings
*pContents = ostr.str();
string_utils::convertLineEndings(pContents, lineEnding);
return Success();
}
catch(const std::exception& e)
{
Error error = systemError(boost::system::errc::io_error,
ERROR_LOCATION);
error.addProperty("what", e.what());
error.addProperty("path", filePath.absolutePath());
return error;
}
return Success();
}
Error readCollectionFromFile(
const core::FilePath& filePath,
CollectionType* pCollection,
boost::function<ReadCollectionAction(const std::string& line,
typename CollectionType::value_type* pValue)>
parseFunction,
bool trimAndIgnoreBlankLines=true)
{
using namespace boost::system::errc ;
// open the file stream
boost::shared_ptr<std::istream> pIfs;
Error error = filePath.open_r(&pIfs);
if (error)
return error;
// create insert iterator
std::insert_iterator<CollectionType> insertIterator(*pCollection,
pCollection->begin());
try
{
// read each line
std::string nextLine ;
while (true)
{
// read the next line
std::getline(*pIfs, nextLine) ;
if (pIfs->eof())
break;
else if (pIfs->fail())
return systemError(io_error, ERROR_LOCATION);
// trim whitespace then ignore it if it is a blank line
if (trimAndIgnoreBlankLines)
{
boost::algorithm::trim(nextLine) ;
if (nextLine.empty())
continue ;
}
// parse it and add it to the collection
typename CollectionType::value_type value ;
ReadCollectionAction action = parseFunction(nextLine, &value);
if (action == ReadCollectionAddLine)
{
*insertIterator++ = value ;
}
else if (action == ReadCollectionIgnoreLine)
{
// do nothing
}
else if (action == ReadCollectionTerminate)
{
break; // exit read loop
}
}
}
catch(const std::exception& e)
{
Error error = systemError(boost::system::errc::io_error,
ERROR_LOCATION);
error.addProperty("what", e.what());
error.addProperty("path", filePath.absolutePath());
return error;
}
return Success() ;
}
