public override ICodeNode VisitBinaryExpression(BinaryExpression node)
{
bool shouldAddLeftParentheses = false;
if (node.Left.CodeNodeType == CodeNodeType.BinaryExpression)
{
BinaryExpression leftAsBinary = node.Left as BinaryExpression;
int compared = leftAsBinary.CompareOperators(node);
// (a + b) * c
if (compared > 0)
{
shouldAddLeftParentheses = true;
}
else if (leftAsBinary.IsOverridenOperation)
{
shouldAddLeftParentheses = true;
}
}
if (shouldAddLeftParentheses)
{
node.Left = new ParenthesesExpression(node.Left);
}
bool shouldAddRightParentheses = false;
if (node.Right.CodeNodeType == CodeNodeType.BinaryExpression)
{
BinaryExpression rightAsBinary = node.Right as BinaryExpression;
int compared = rightAsBinary.CompareOperators(node);
// a * (b + c)
if (compared > 0)
{
shouldAddRightParentheses = true;
}
else if (compared == 0)
{
// a * (b / c)
if (node.Operator != rightAsBinary.Operator)
{
shouldAddRightParentheses = true;
}
// a - (b - c)
else if (!IsCommutative(node.Operator))
{
shouldAddRightParentheses = true;
}
// a + (b + c)
else if (rightAsBinary.ExpressionType == rightAsBinary.ExpressionType.Module.TypeSystem.Single ||
rightAsBinary.ExpressionType == rightAsBinary.ExpressionType.Module.TypeSystem.Double)
{
shouldAddRightParentheses = true;
}
}
else if (!node.IsAssignmentExpression && rightAsBinary.IsOverridenOperation)
{
shouldAddRightParentheses = true;
}
}
if (shouldAddRightParentheses)
{
node.Right = new ParenthesesExpression(node.Right);
}
return(base.VisitBinaryExpression(node));
}