Pattern.java 文件源码

public static Matcher compile(String query) {
  try {
    CodePointCharStream input = CharStreams.fromReader(new StringReader(query));
    ExprLexer lexer = new ExprLexer(input);
    CommonTokenStream tokens = new CommonTokenStream(lexer);
    ExprParser parser = new ExprParser(tokens);
    ParseTree tree = parser.expr();
    Visitor visitor = new Visitor();
    visitor.visit(tree);
    return visitor.expression().normalize();
  } catch (IOException e) {
    throw new RuntimeException(e.getLocalizedMessage(), e);
  }
}