/usr/share/doc/jflex/examples/byaccj/calc.flex is in jflex 1.4.3+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright (C) 2000 Gerwin Klein <lsf@jflex.de> *
* All rights reserved. *
* *
* Thanks to Larry Bell and Bob Jamison for suggestions and comments. *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License. See the file *
* COPYRIGHT for more information. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License along *
* with this program; if not, write to the Free Software Foundation, Inc., *
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
%%
%byaccj
%{
private Parser yyparser;
public Yylex(java.io.Reader r, Parser yyparser) {
this(r);
this.yyparser = yyparser;
}
%}
NUM = [0-9]+ ("." [0-9]+)?
NL = \n | \r | \r\n
%%
/* operators */
"+" |
"-" |
"*" |
"/" |
"^" |
"(" |
")" { return (int) yycharat(0); }
/* newline */
{NL} { return Parser.NL; }
/* float */
{NUM} { yyparser.yylval = new ParserVal(Double.parseDouble(yytext()));
return Parser.NUM; }
/* whitespace */
[ \t]+ { }
\b { System.err.println("Sorry, backspace doesn't work"); }
/* error fallback */
[^] { System.err.println("Error: unexpected character '"+yytext()+"'"); return -1; }
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