using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;

//Jason Kim
//CSE 655
//Summer 2005
//Inst: B.Mathis

namespace CSE655Project
{
	/*syntax notes for fake langauge earl:
		Syntax Rules
		<program>    ::= #!/usr/bin/earl  <statement>+  
		</program>   ::= #!/end (end of program)
		<statement>  ::= <assignment> | <conditional> | <loop> | <function>
		<assignment> ::= <identifier> = <expr>;
		<conditional ::= if <expr> { <statement>+ ) |
					   if <expr> { <statement>+ }
						  else { <statement>+ }
		<function>   ::= <name> 
		<loop>       ::= while(<expr>){ <statement>+ }
		<term>       ::= <identifier> | <number> | ( <expr> ) | "<letter>*" | >> <expr> 
		<expr>       ::= <term> | <term> <operator> <expr> | <function> 
		Lexical Rules
		 <operator>   ::= + | - | * | / | = | != | < | > | <= | => | == | !
		 <identifier> ::= #<letter> <ld>* 
		<ld>         ::= <letter> | <digit> | <letter><ld> | <digit><id>
		<number>     ::= <digit>+
		<letter>     ::= a|b|c|d|e|f|g|h|i|j|k|l|m|
					   n|o|p|q|r|s|t|u|v|w|x|y|z|,|'|.|~|@|#|$|%|^|&|*
					   (|)|_|+|=|-|\|/|?|{|}|]|[|:|;|"|!|`
		<digit>      ::= 0|1|2|3|4|5|6|7|8|9
		<name>       ::= print <expr>; | dbconn(<expr>);| dbsel(<expr>);| dbexec(<expr>);| dbgetrow(<expr>);| dbclose(<expr>)
		                | fopen(<expr>, <expr>);| fclose(<expr>); | fwrite(<expr>,<expr>); | fread(<expr>,<expr>); | filesize(<expr>);
						| GetPost[<expr>]; | GetCookie[<expr>] 
						| MakeCookie(<expr>,<expr>*,<expr>*,<expr>*,<expr>*,<expr>*) | time();
		note: <thing>+ means a sequence of at least one <thing>
			  <thing>* means a potentially empty sequence of <thing>
		*/	 		


	class Class1
	{

		[STAThread]
		static void Main(string[] args)
		{
			//Arg 0 = Source EARL file
			//Arg 1 = Token File
			//Arg 2 = Goal PHP file

			//Open Files, variable dec.
			FileStream file = new FileStream(args[1],FileMode.OpenOrCreate,FileAccess.Write);
			StreamWriter tw = new StreamWriter(file); // open token file for writing
			StreamReader re = File.OpenText(args[0]); //open source for reading
			string b;


			Console.WriteLine("Creating Tokens from Earl File");
			//tokenize
			while((b = re.ReadLine())!= null )
			{
				//Tokenize IF blocks First
				if(b.Length >0)
				{
					if(b[0]=='i')
					{
						b = Regex.Replace(b,"if", "<conditional><name if>");
					}
					if(b[0]=='e')
					{
						b = Regex.Replace(b,"else","<conditional><name else>");
					}
				}
				b.Trim();
				
				//Tokenize Start Indicators
				b = Regex.Replace(b,"#!/usr/bin/earl", "<program><statement>");
				b = Regex.Replace(b,"#!/end", "</program>");
				
				//tokenize Loops 
				b = Regex.Replace(b,"while","<loop>");

				//Token Functions
				b = Regex.Replace(b,"print", "<function><name print>");
				b = Regex.Replace(b,"dbconn", "<function><name dbconn>");
				b = Regex.Replace(b,"dbse", "<function><name dbse>");
				b = Regex.Replace(b,"dbexec", "<function><name dbexec>");
				b = Regex.Replace(b,"dbgetrow", "<function><name dbgetrow>");
				b = Regex.Replace(b, "dbclose", "<function><name dbclose>");
				b = Regex.Replace(b, "fopen","<function><name fopen>");
				b = Regex.Replace(b, "fclose","<function><name fclose>");
				b = Regex.Replace(b, "fread","<function><name fread>");
				b = Regex.Replace(b, "fwrite","<function><name fwrite>");
				b = Regex.Replace(b, "GetPost","<function><name Get><Post>");
				b = Regex.Replace(b, "GetCookie", "<function><name Get><Cookie>");
				b = Regex.Replace(b, "filesize", "<function><name filesize>");
				b = Regex.Replace(b, "time", "<function><name time>");
				b = Regex.Replace(b, "MakeCookie", "<function><name MakeCookie>");

				//Token Variables last
				b = Regex.Replace(b,"#","<expr><term><identifier>");
				
				//Write to Token File
				tw.WriteLine(b);
				
			}
			Console.WriteLine("Done making Token File Press Enter to Continue");
			Console.ReadLine();
			re.Close();//Close Source File
			tw.Close();//Close Token File
 
			re = File.OpenText(args[1]);//Open Token File for reading

			//Create Output PHP file
			FileStream xfile = new FileStream(args[2],FileMode.OpenOrCreate,FileAccess.Write);
			StreamWriter xw = new StreamWriter(xfile);

			//Parse Tokens
			while((b = re.ReadLine())!= null )
			{
				//Parse Function Tokens First
				b = Regex.Replace(b,"<function><name dbconn>","mysql_connect");
				b = Regex.Replace(b,"<function><name dbse>", "mysql_select_db");
				b = Regex.Replace(b,"<function><name dbexec>", "mysql_query");
				b = Regex.Replace(b,"<function><name dbgetrow>", "mysql_fetch_row");
				b = Regex.Replace(b,"<function><name dbclose>","mysql_close");
				b = Regex.Replace(b,"<function><name print>", "echo");
				b = Regex.Replace(b,"<function><name Get>","$");
				b = Regex.Replace(b,"<Post>","_POST");
				b = Regex.Replace(b,"<Cookie>","_COOKIE");
				b = Regex.Replace(b,"<function><name fopen>","fopen");
				b = Regex.Replace(b,"<function><name fread>","fread");
				b = Regex.Replace(b,"<function><name fclose>","fclose");
				b = Regex.Replace(b,"<function><name filesize>","filesize");
				b = Regex.Replace(b,"<function><name MakeCookie>","setcookie");
				b = Regex.Replace(b,"<function><name time>","time");

				//Parse start/end Tokens
				b = Regex.Replace(b,"<program><statement>","<?php ");
				b = Regex.Replace(b,"</program>","?>");
				
				//Parse Variable Tokens
				b = Regex.Replace(b,"<expr><term><identifier>","$");
				
				//Parse Loop Tokens
				b = Regex.Replace(b,"<loop>","while");

				//Parse If Block tokens
				b = Regex.Replace(b,"<conditional><name if>","if");
				b = Regex.Replace(b,"<conditional><name else>","else");

				
				//Parse string adds
				b = Regex.Replace(b,">>",".");

				//write to output file
				xw.WriteLine(b);

				
			}
			re.Close();//close token file
			xw.Close();//close


		
		}
	}
}