#include "ListParser.h"

#include <fstream>
#include <string>
using namespace std;

// Aid function that chomps the trailing '\n' or "\n\r" if there are any from a string and 
// returns the string without them.
string chomp(const string &strToChomp)
{
	const char CARRIAGE_RETURN = '\r';
	const char NEW_LINE = '\n';
	
	int lastIndex = strToChomp.length()-1;

	if ((lastIndex >= 0) && (strToChomp[lastIndex] == CARRIAGE_RETURN))
	{
		--lastIndex;
	}
	if ((lastIndex >= 0) && (strToChomp[lastIndex] == NEW_LINE))
	{
		--lastIndex;
	}
	return strToChomp.substr(0, lastIndex + 1);
}

/*
 *	Parses a text file and puts its lines inside a vector.
 *  filename - the name of the file to parse
 *  vec		 - the vector to put the lines in. 
 */
int List_Parser::parseItemList(const ACE_TCHAR * fileName, std::vector<ACE_TString> &vec)
{
	int status = PARSER_STATUS_FAILURE;

	if (fileName == NULL) 
	{
		return status;
	}

	const char * WHITESPACE_CHARS = " \n\t\r";

	ifstream fileStream;
	string str;

	bool errorOccured = false;

	fileStream.open(fileName, ifstream::in);
	if(!fileStream.fail()) 
	{

		while ((!errorOccured) && (!fileStream.eof()))
		{	
			getline(fileStream, str);

			// if there are empty lines in the file, than skip them. 
			// Do this before reading the fail bits since it IS considered a failure by getline. 
			
			// but first chomp the line from '\n' or "\n\r" (in Linux)
			str = chomp(str);			
			
			if (str.empty()) 
			{
				continue;
			}

			if(!fileStream.fail()) 
			{
				// remove whitespaces at the beginning
				int firstNotWhite = str.find_first_not_of(WHITESPACE_CHARS);
				str.erase(0, firstNotWhite);

				if (str.at(0) != COMMENT_START_CHARACTER) 
				{
					vec.push_back(ACE_TString(str.c_str()));
				}
			}
			else 
			{
				errorOccured = true;
			}
		}

		if (!errorOccured) 
		{
			status = PARSER_STATUS_SUCCESS;
		}
	}

	fileStream.close();
	return status;
}