/// <summary>
/// Determine whether parentheses are needed around the right subtree base on the current operator.
/// </summary>
/// <param name="currentOperator">The current binary node's operator.</param>
/// <param name="rightSubtree">The right binary subtree.</param>
/// <returns>True if need parentheses, false if not.</returns>
private static bool NeedParenthesesRight(BinaryOperator currentOperator, BinaryOperatorQueryToken rightSubtree)
{
BinaryOperator rightOperator = BinaryOperator.GetOperator(rightSubtree.OperatorKind);
if (currentOperator.Precedence < rightOperator.Precedence)
{
return false;
}
if (currentOperator.Precedence > rightOperator.Precedence)
{
return true;
}
// They are equal in precedence,
return currentOperator.NeedParenEvenWhenTheSame;
}
/// <summary>
/// Determine whether parentheses are needed around the left subtree base on the current operator.
/// </summary>
/// <param name="currentOperator">The current binary node's operator.</param>
/// <param name="leftSubtree">The left binary subtree.</param>
/// <returns>True if need parenthese, false if not.</returns>
private static bool NeedParenthesesLeft(BinaryOperator currentOperator, BinaryOperatorQueryToken leftSubtree)
{
BinaryOperator leftOperator = BinaryOperator.GetOperator(leftSubtree.OperatorKind);
return leftOperator.Precedence < currentOperator.Precedence;
}
/// <summary>
/// Determine whether parentheses are needed around the left subtree base on the current operator.
/// </summary>
/// <param name="currentOperator">The current binary node's operator.</param>
/// <param name="leftSubtree">The left binary subtree.</param>
/// <returns>True if need parenthese, false if not.</returns>
private static bool NeedParenthesesLeft(BinaryOperator currentOperator, BinaryOperatorToken leftSubtree)
{
BinaryOperator leftOperator = BinaryOperator.GetOperator(leftSubtree.OperatorKind);
return(leftOperator.Precedence < currentOperator.Precedence);
}
