jeena/CC
1
0
Fork 0
Code Issues Pull requests Projects Packages Wiki Activity Actions

first commit

Browse source
This commit is contained in:
Jeena Paradies 2011-04-19 11:37:05 +02:00
commit 063194f8be
349 changed files with 36508 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

51
jasmin/jasmin-2.4/lib/java_cup/simple_calc/scanner.java Normal file
View file

@ -0,0 +1,51 @@
// Simple Example Scanner Class
import java_cup.runtime.*;
public class scanner {
/* single lookahead character */
protected static int next_char;
/* advance input by one character */
protected static void advance() throws java.io.IOException
{
next_char = System.in.read();
}
/* initialize the scanner */
public static void init() throws java.io.IOException { advance(); }
/* recognize and return the next complete token */
public static token next_token() throws java.io.IOException
{
for (;;)
switch (next_char)
{
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
/* parse a decimal integer */
int i_val = 0;
do {
i_val = i_val * 10 + (next_char - '0');
advance();
} while (next_char >= '0' && next_char <= '9');
return new int_token(sym.NUMBER, i_val);
case ';': advance(); return new token(sym.SEMI);
case '+': advance(); return new token(sym.PLUS);
case '-': advance(); return new token(sym.MINUS);
case '*': advance(); return new token(sym.TIMES);
case '/': advance(); return new token(sym.DIVIDE);
case '%': advance(); return new token(sym.MOD);
case '(': advance(); return new token(sym.LPAREN);
case ')': advance(); return new token(sym.RPAREN);
case -1: return new token(sym.EOF);
default:
/* in this simple scanner we just ignore everything else */
advance();
break;
}
}
};