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/**
* Author: Nigel Brown
*
* Copyright (c) 2007 Des Higgins, Julie Thompson and Toby Gibson.
*/
/**
* InFileStream subclasses std::ifstream, adding a check for the end-of-line
* character convention in the input file. This is then used by the getline()
* member as the line delimiter, unless the caller supplies an explicit
* delimiter.
*
* Note: This is an ugly workaround; at present various operations repeatedly
* construct/destruct an instance and open/close a sequence file up to 12
* times! A cleaner class will probably derive this class from something like
* 'istream' aggregating a 'filebuf' under control of istream::seekg().
*
* Created: 09-02-07,Nigel Brown(EMBL)
*
* Changes:
* Mark Larkin 13-2-07: I removed the dynamic cast from the getline functions.
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string>
#include <fstream>
#include <iostream>
#include "InFileStream.h"
using namespace std;
const char LF = 0x0a; //linefeed
const char CR = 0x0d; //carriage return
InFileStream::InFileStream() :
ifstream()
{
delim = '\n'; // default
//cout << "InFileStream() constructor 1" << endl;
}
InFileStream::InFileStream(const char *filename) :
ifstream(filename, ios::in), filename(filename)
{
//cout << "InFileStream(f) constructor 2" << endl;
delim = findDelimiter();
}
//- copy-constructor: can't copy superclass private members
//- InFileStream::InFileStream(const InFileStream ©) :
//- ifstream(static_cast<const ifstream&>(copy))
//- {
//- cout << "InFileStream() constructor 3" << endl;
//- delim = copy.delim;
//- }
void InFileStream::open(const char *filename)
{
this->filename = filename;
ifstream::open(filename, ios::in);
if (ifstream::fail())
return;
delim = findDelimiter();
}
//not necessary, but for symmetry to open()
void InFileStream::close()
{
ifstream::close();
}
//getline with stored delimiter
std::istream& InFileStream::getline(char *s, streamsize n)
{
return ifstream::getline(s, n, delim);
}
//getline with caller supplied delimiter
std::istream& InFileStream::getline(char *s, streamsize n, char delim)
{
return ifstream::getline(s, n, delim);
}
/**
* Mark 24-1-2007. I added the function findDelimiter to determine if '\r' or
* '\n' will be used as the line delimiter when parsing the file.
*
* 25-01-07,Nigel Brown(EMBL): changed body of loop to check successive chars
* in case of DOS/Windows
*
* 09-02-07,Nigel Brown(EMBL): moved member into new InFileStream subclassed
* from std::ifstream, so this is called automatically for any file reader
* that uses InFileStream in place of std::ifstream. Replaced if/then/else
* with switch.
*/
char InFileStream::findDelimiter()
{
ifstream in;
int type = 0;
in.open(filename.c_str(), ios::in);
if (in.fail())
return delim;
in.seekg(0, ios::beg);
//look for CR or LF or CRLF (or LFCR)
if (in.is_open()) {
char c;
while (in.get(c)) {
if (c == CR)
type |= 1;
else if (c == LF)
type |= 2;
else if (type)
break;
}
}
in.close();
switch (type) {
case 1:
//cout << "file is Mac System 9" << endl;
delim = '\r';
break;
case 2:
//cout << "file is UNIX" << endl;
delim = '\n';
break;
case 3:
//cout << "file is DOS" << endl;
delim = '\n';
break;
default: //short or empty file
//cout << "file is UNIX (default)" << endl;
delim = '\n';
}
return delim;
}
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