Utilities.java 文件源码

/**
 * Creating parentheses expression.
 */
public static ParenthesesContext createParenthesesContext(final ExprContext expr) {

  final ParenthesesContext parenthesesContext = new ParenthesesContext(new ExprContext());
  final TerminalNodeImpl leftParenthes = new TerminalNodeImpl(new CommonToken(FOLParser.LP, "("));
  final TerminalNodeImpl rightParenthes =
      new TerminalNodeImpl(new CommonToken(FOLParser.RP, ")"));

  // Setting context parents.
  leftParenthes.parent = parenthesesContext;
  rightParenthes.parent = parenthesesContext;
  expr.parent = parenthesesContext;

  // Adding parentheses expression's children.
  parenthesesContext.addChild(leftParenthes);
  parenthesesContext.addChild(expr);
  parenthesesContext.addChild(rightParenthes);

  return parenthesesContext;
}