/*
    Very Simple Compiler (Tokenizer part)
        $Id$
 */

#include "s-compile.h"

void error(char *);
int  token();

char *ptr,*last_ptr,*before;
int  value,lvalue;
int  last_token;

int
token()
{
    int c,d;

    last_ptr = ptr;  /* for error position */
    c= *ptr;
    if(!c) {
        last_token = EOF;
        return last_token;
    }
    ptr++;
    if (c<=' ') {       /* comment */ 
        while(*ptr++);
        ptr--;
        last_token = EOF;
        last_ptr = ptr;
        return last_token;
    }
    if('0'<=c && c<='9') {     /* Decimal */
        d = c-'0';
        while((c= *ptr++)) {
            if('0'<=c && c<='9') {
                d = d*10 + (c - '0');
            } else {
                break;
            }
        }
        if (c!=0) ptr--;
        value = d;
        last_token = '0';
        return last_token;
    } else if ('a'<=c && c<='z') {    /* variable */
        value = c-'a';                /* return variable reference */
        last_token = 'v';
        return last_token;
    } else {
        last_token = c;
        return last_token;
        return c;
    }
}

void
error(s)
char *s;
{
    fprintf(stderr,"%s on %s\n",s,last_ptr);
}



/* end */