private IFilterNode ParseComparisonExpression(IFilterNode firstArgument)
{
if (Is(FilterTokenType.ComparisonOperator))
{
FilterToken token = Expect(FilterTokenType.ComparisonOperator);
IFilterNode filterNode = PrimaryExpression();
return(new ComparisonNode
{
First = firstArgument,
FilterOperator = token.ToFilterOperator(),
Second = filterNode
});
}
else
{
FilterToken token = Expect(FilterTokenType.Function);
var functionNode = new FunctionNode
{
FilterOperator = token.ToFilterOperator()
};
functionNode.Arguments.Add(firstArgument);
functionNode.Arguments.Add(PrimaryExpression());
return(functionNode);
}
}
private IFilterNode ParseFunctionExpression()
{
FilterToken token = Expect(FilterTokenType.Function);
var functionNode = new FunctionNode
{
FilterOperator = token.ToFilterOperator()
};
Expect(FilterTokenType.LeftParenthesis);
functionNode.Arguments.Add(Expression());
while (Is(FilterTokenType.Comma))
{
Expect(FilterTokenType.Comma);
functionNode.Arguments.Add(Expression());
}
Expect(FilterTokenType.RightParenthesis);
return(functionNode);
}
