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The Waikato Environment for Knowledge Analysis (WEKA), a machine learning workbench. This version represents the developer version, the "bleeding edge" of development, you could say. New functionality gets added to this version.

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/*
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   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, see .
 */

/*
 * Scanner.java
 * Copyright (C) 2008-2012 University of Waikato, Hamilton, New Zealand
 */

package weka.core.mathematicalexpression;

import java_cup.runtime.SymbolFactory;
import java.io.*;

/**
 * A scanner for mathematical expressions.
 *
 * @author FracPete (fracpete at waikato dot ac dot nz)
 * @version $Revision: 8034 $
 */
%%
%cup
%public
%class Scanner
%{
  // Author: FracPete (fracpete at waikato dot ac dot nz)
  // Version: $Revision: 8034 $
  protected SymbolFactory sf;

  public Scanner(InputStream r, SymbolFactory sf){
    this(r);
    this.sf = sf;
  }
%}
%eofval{
    return sf.newSymbol("EOF",sym.EOF);
%eofval}

%%
// operands
"-" { return sf.newSymbol("Minus", sym.MINUS); }
"+" { return sf.newSymbol("Plus", sym.PLUS); }
"*" { return sf.newSymbol("Times", sym.TIMES); }
"/" { return sf.newSymbol("Division", sym.DIVISION); }

// boolean stuff
"<" { return sf.newSymbol("Less than", sym.LT); }
"<=" { return sf.newSymbol("Less or equal than", sym.LE); }
">" { return sf.newSymbol("Greater than", sym.GT); }
">=" { return sf.newSymbol("Greater or equal than", sym.GE); }
"=" { return sf.newSymbol("Equals", sym.EQ); }
"!" { return sf.newSymbol("Not", sym.NOT); }
"&" { return sf.newSymbol("And", sym.AND); }
"|" { return sf.newSymbol("Or", sym.OR); }
"true" { return sf.newSymbol("True", sym.TRUE); }
"false" { return sf.newSymbol("False", sym.FALSE); }

// functions
"abs" { return sf.newSymbol("Abs", sym.ABS); }
"sqrt" { return sf.newSymbol("Sqrt", sym.SQRT); }
"log" { return sf.newSymbol("Log", sym.LOG); }
"exp" { return sf.newSymbol("Exp", sym.EXP); }
"sin" { return sf.newSymbol("Sin", sym.SIN); }
"cos" { return sf.newSymbol("Cos", sym.COS); }
"tan" { return sf.newSymbol("Tan", sym.TAN); }
"rint" { return sf.newSymbol("Rint", sym.RINT); }
"floor" { return sf.newSymbol("Floor", sym.FLOOR); }
"pow" { return sf.newSymbol("Pow", sym.POW); }
"ceil" { return sf.newSymbol("Ceil", sym.CEIL); }
"ifelse" { return sf.newSymbol("IfElse", sym.IFELSE); }

// numbers and variables
[0-9][0-9]*\.?[0-9]* { return sf.newSymbol("Number", sym.NUMBER, new Double(yytext())); }
-[0-9][0-9]*\.?[0-9]* { return sf.newSymbol("Number", sym.NUMBER, new Double(yytext())); }
[A-Z]+[0-9]* { return sf.newSymbol("Variable", sym.VARIABLE, new String(yytext())); }

// whitespaces
[ \r\n\t\f] { /* ignore white space. */ }

// various
"," { return sf.newSymbol("Comma", sym.COMMA); }
"(" { return sf.newSymbol("Left Bracket", sym.LPAREN); }
")" { return sf.newSymbol("Right Bracket", sym.RPAREN); }

// catch all
. { System.err.println("Illegal character: "+yytext()); }