symbol.java

pl0编译器的java版本

public class Symbol {
    
    public static final int nul = 0;
    public static final int ident = 1;
    public static final int number = 2;
    public static final int plus = 3;
    public static final int minus = 4;
    public static final int times = 5;
    public static final int slash = 6;
    public static final int oddsym = 7;
    public static final int eql = 8;
    public static final int neq = 9;
    public static final int lss = 10;
    public static final int leq = 11;
    public static final int gtr = 12;
    public static final int geq = 13;
    public static final int lparen = 14;
    public static final int rparen = 15;
    public static final int comma = 16;
    public static final int semicolon = 17;
    public static final int period = 18;
    public static final int becomes = 19;
    public static final int beginsym = 20;
    public static final int endsym = 21;
    public static final int ifsym = 22;
    public static final int thensym = 23;
    public static final int whilesym = 24;
    public static final int writesym = 25;
    public static final int readsym = 26;
    public static final int dosym = 27;
    public static final int callsym = 28;
    public static final int constsym = 29;
    public static final int varsym = 30;
    public static final int procsym = 31;

    public int symtype;
    public String id;
    public boolean overflow;
    public int num;

    Symbol(int stype) {
	    symtype = stype;
    }

    Symbol(int stype, String s) {
	    symtype = stype;
	    id = s;
    }

    Symbol(int stype, boolean oflow, int n) {
	    symtype = stype;
	    overflow = oflow;
	    num = n;
    }

}