using System;
using Collections = System.Collections.Generic;
using IO = System.IO;
using Text = System.Text;

namespace FireBird
{
	
	public class StringStream
	{
	
	    	public string CurrentString
	    	{
	    		get
	    		{
	    			if( ( Position >= StringList.Count ) || ( Position < 0 ) )
	    			{
	    				return "";
	    			}
	    			return StringList[Position];
	    		}
	    	}
	    	
	    	public int Length
	    	{
	    		get
	    		{
	    			return StringList.Count;
	    		}
	    	}
	
	    	private int Position = 0;
	
			private Collections.List<string> StringList = new Collections.List<string>();
	
			public StringStream( IO.StreamReader StreamReader )
			{
				StreamReader.BaseStream.Position = 0;
				while( true )
				{
					string Line = StreamReader.ReadLine();
					if( Line != null )
					{
						string[] StringArray = Line.Split( ' ', '\t' );
						for( int i = 0; i < StringArray.Length; i++ )
						{
							if( ( StringArray[i].Length > 0 ) && ( StringArray[i] != " " ) )
							{
								StringList.Add( StringArray[i].Trim( ' ', '\t' ) );
							}
							StringList.Add( "\n" );
						}
					}
					else
					{
						break;
					}
				}
				return;
			}
			
			public string LookBackward()
			{
				if( Position - 1 < 0 )
	    			{
	    				return "";
	    			}
	    			return StringList[Position-1];
			}
	
			public string LookBackward( int Amount )
			{
				if( Position - Amount < 0 )
	    			{
	    				return "";
	    			}
	    			return StringList[Position-Amount];
			}
	
	        	public string LookForward()
			{
				if( Position + 1 >= StringList.Count )
	    			{
	    				return "";
	    			}
	    			return StringList[Position+1];
			}
	
			public string LookForward( int Amount )
			{
				if( Position + Amount >= StringList.Count )
	    			{
	    				return "";
	    			}
	    			return StringList[Position+Amount];
			}
	
			public string MoveBackward()
			{
				Position -= 1;
				return CurrentString;
			}
				
			public string MoveBackward( int Amount )
			{
				Position -= Amount;
				return CurrentString;
			}
		
			public string MoveForward()
			{
				Position += 1;
				return CurrentString;
			}
				
			public string MoveForward( int Amount )
			{
				Position += Amount;
				return CurrentString;
			}
				
			public string MoveTo( string Value )
			{
				while( ( CurrentString != "" ) && ( CurrentString != Value ) )
				{
					MoveForward();
				}
				return CurrentString;
			}
			
			public float ReadFloat()
			{
				float Value = 0.0f;
				float.TryParse( MoveForward(), out Value );
				return Value;
			}
			
			public void ReadFloat( ref float Value )
			{
				float.TryParse( MoveForward(), out Value );
				return;
			}
			
			public int ReadInt()
			{
				int Value = 0;
				int.TryParse( MoveForward(), out Value );
				return Value;
			}
			
			public void ReadInt( ref int Value )
			{
				int.TryParse( MoveForward(), out Value );
				return;
			}
				
			public void ReadLine()
			{
				while( ( CurrentString != "" ) && ( CurrentString != "\n" ) )
				{
					MoveForward();
				}
				return;
			}
		
			public string ReadQuotation()
			{
				if( MoveForward() != "\"" )
				{
					return CurrentString;
				}