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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright (C) 2000 Gerwin Klein <lsf@jflex.de> *
* All rights reserved. *
* *
* Thanks to Larry Bell and Bob Jamison for suggestions and comments. *
* *
* License: BSD *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
%%
%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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