public SortSpec Parse(string sortSpec)
{
this.input = sortSpec;
string[] parts = input.Split(',');
var fields = new List <SortSpecField>();
foreach (var part in parts)
{
RqlFunctionCallExpression funcExp = null;
try
{
funcExp = new RqlParser().Parse(part) as RqlFunctionCallExpression;
}
catch (RqlParseException e)
{
throw new SortSpecParserException("Sort specification must be of the form field(...)", e);
}
if (funcExp.Arguments.Count != 1)
{
throw new SortSpecParserException("Sort specifications must have exactly one argument");
}
RqlConstantExpression constExp = funcExp.Arguments[0] as RqlConstantExpression;
if (constExp == null || !(constExp.Value is Int32))
{
throw new SortSpecParserException("Sort specification value must be an integer");
}
var value = (int)constExp.Value;
if (value != 1 && value != -1)
{
throw new SortSpecParserException("Sort specification value must be 1 or -1");
}
fields.Add(new SortSpecField(funcExp.Name, value == 1 ? SortSpecSortOrder.Ascending : SortSpecSortOrder.Descending));
}
return(new SortSpec(fields));
}
public FieldSpec Parse(string fieldSpec)
{
this.input = fieldSpec;
string[] parts = input.Split(',');
var fields = new List <FieldSpecField>();
foreach (var part in parts)
{
RqlFunctionCallExpression funcExp = null;
try
{
funcExp = new RqlParser().Parse(part) as RqlFunctionCallExpression;
}
catch (RqlParseException e)
{
throw new FieldSpecParserException("Field specification must be of the form field(...)", e);
}
if (funcExp.Arguments.Count != 1)
{
throw new FieldSpecParserException("Field specifications must have exactly one argument");
}
RqlConstantExpression constExp = funcExp.Arguments[0] as RqlConstantExpression;
if (constExp == null || !(constExp.Value is Int32))
{
throw new FieldSpecParserException("Field specification must be an integer");
}
var value = (int)constExp.Value;
if (value != 0 && value != 1)
{
throw new FieldSpecParserException("Field specification value must be 0 or 1");
}
fields.Add(new FieldSpecField(funcExp.Name, value == 1 ? FieldSpecPresence.Included : FieldSpecPresence.Excluded));
}
return(new FieldSpec(fields));
}
protected virtual RqlExpression VisitConstant(RqlConstantExpression node)
{
return node;
}
protected override RqlExpression VisitConstant(RqlConstantExpression node)
{
s += FormatSimpleConstant(node.Type, node.Value);
return node;
}
protected virtual RqlExpression VisitConstant(RqlConstantExpression node)
{
return(node);
}