Calculator.java 文件源码

public static void main(String[] args) throws Exception
 {
  String testFile = "";
// set test input
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new java.io.File("."));
chooser.setDialogTitle("Please choose the master file");
chooser.setAcceptAllFileFilterUsed(false);

if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
  testFile = chooser.getSelectedFile().getAbsolutePath();
} else {
  System.exit(0);
}

   Calculator4Lexer lexer = new Calculator4Lexer(new ANTLRFileStream(testFile));
   CommonTokenStream tokens = new CommonTokenStream(lexer);
   Calculator4Parser p = new Calculator4Parser(tokens);
   p.setBuildParseTree(true);
   p.addParseListener(new CalculatorListener());
   ParserRuleContext t = p.program();
 }