/* MicroJava Scanner (HM 06-12-28)
   =================
*/
package MJ;
import java.io.*;

public class Scanner {
	private static final char eofCh = '\u0080';
	private static final char eol = '\n';
	private static final int  // token codes
		none      = 0,
		ident     = 1,
		number    = 2,
		charCon   = 3,
		plus      = 4,
		minus     = 5,
		times     = 6,
		slash     = 7,
		rem       = 8,
		eql       = 9,
		neq       = 10,
		lss       = 11,
		leq       = 12,
		gtr       = 13,
		geq       = 14,
		assign    = 15,
		semicolon = 16,
		comma     = 17,
		period    = 18,
		lpar      = 19,
		rpar      = 20,
		lbrack    = 21,
		rbrack    = 22,
		lbrace    = 23,
		rbrace    = 24,
		class_    = 25,
		else_     = 26,
		final_    = 27,
		if_       = 28,
		new_      = 29,
		print_    = 30,
		program_  = 31,
		read_     = 32,
		return_   = 33,
		void_     = 34,
		while_    = 35,
		eof       = 36;
	private static final String key[] = { // sorted list of keywords
		"class", "else", "final", "if", "new", "print",
		"program", "read", "return", "void", "while"
	};
	private static final int keyVal[] = {
		class_, else_, final_, if_, new_, print_,
		program_, read_, return_, void_, while_
	};

	private static char ch;			// lookahead character
	public  static int col;			// current column
	public  static int line;		// current line
	private static int pos;			// current position from start of source file
	private static Reader in;  	// source file reader
	private static char[] lex;	// current lexeme (token string)

	//----- ch = next input character
	private static void nextCh() {
		try {
			ch = (char)in.read(); col++; pos++;
			if (ch == eol) {line++; col = 0;}
			else if (ch == '\uffff') ch = eofCh;
		} catch (IOException e) {
			ch = eofCh;
		}
	}

	//--------- Initialize scanner
	public static void init(Reader r) {
		in = new BufferedReader(r);
		lex = new char[64];
		line = 1; col = 0;
		nextCh();
	}

	//---------- Return next input token
	public static Token next() {
		TODO // add your code here
	}
}