private static Expression ParseEqualityExpression(Scanner scanner)
{
Expression left = ParseComparisonExpression(scanner);
while (true)
{
if (scanner.TryGetDelimiter("=="))
{
Expression right = ParseComparisonExpression(scanner);
left = new EqualExpression(left, right);
}
else if (scanner.TryGetDelimiter("!="))
{
Expression right = ParseComparisonExpression(scanner);
left = new NotEqualExpression(left, right);
}
else if (scanner.TryGetIdentifier("is"))
{
Expression right = ParseComparisonExpression(scanner);
left = new IsExpression(left, right);
}
else if (scanner.TryGetIdentifier("isnot"))
{
Expression right = ParseComparisonExpression(scanner);
left = new IsNotExpression(left, right);
}
else
{
return(left);
}
}
}
private static Expression ParseEqualityExpression(Scanner scanner)
{
Expression left = ParseComparisonExpression(scanner);
while (true)
{
if (scanner.TryGetDelimiter("=="))
{
Expression right = ParseComparisonExpression(scanner);
left = new EqualExpression(left,right);
}
else if (scanner.TryGetDelimiter("!="))
{
Expression right = ParseComparisonExpression(scanner);
left = new NotEqualExpression(left,right);
}
else if (scanner.TryGetIdentifier("is"))
{
Expression right = ParseComparisonExpression(scanner);
left = new IsExpression(left,right);
}
else if (scanner.TryGetIdentifier("isnot"))
{
Expression right = ParseComparisonExpression(scanner);
left = new IsNotExpression(left,right);
}
else
{
return left;
}
}
}