package com.smtscript.lib.file;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;


public class JSFileTextReader 
{
	private BufferedReader	_reader;
	
	public JSFileTextReader(String fileName, String encode) throws Exception
	{
		_reader = new BufferedReader(new InputStreamReader(new FileInputStream(fileName),encode));
	}
	
	public void close() throws Exception
	{
		if(_reader != null)
		{
			_reader.close();
			_reader = null;
		}
	}
	
	public String readLine() throws Exception
	{
		return _reader.readLine();
	}
	
	public String readChar() throws Exception
	{
		int ch = _reader.read();
		if(ch < 0)
			return null;
		return String.format("%c", ch);
	}
	
	public String readString(int size) throws Exception
	{
		char[] buf = new char[size];
		_reader.read(buf);
		
		return new String(buf);
	}
	
	public String readSQLLine(char chEOF) throws Exception
	{
		int ch;
		char mode = 'N';
		boolean hasValue = false;
		StringBuilder sbSQL = new StringBuilder();
		while((ch = _reader.read()) >= 0)
		{
			hasValue = true;
			if(mode == 'N')
			{
				if(ch == chEOF)
					break;
				if(ch == '\'')
				{
					sbSQL.append((char)ch);
					mode = 'S';
				}
				else if(ch == '"')
				{
					sbSQL.append((char)ch);
					mode = 'D';
				}
				else
				{
					sbSQL.append((char)ch);
				}
			}
			else if(mode == 'S')
			{
				sbSQL.append((char)ch);
				if(ch == '\'')
					mode = 'N';
			}
			else if(mode == 'S')
			{
				sbSQL.append((char)ch);
				if(ch == '\"')
					mode = 'N';
			}
		}
		
		if(!hasValue)
			return null;
		
		return sbSQL.toString();
	}
}