private void NestedExpand(ExpandClause clause)
{
var nestedParser = new ExpandClauseParser(_parser, clause.NestedExpands);
clause.NestedExpandParameter = Expression.Parameter(clause.ItemType);
nestedParser.Parse(clause.NestedExpandParameter);
}
private void ExpandItem()
{
if (_parser.CurrentTokenKind == QueryExpressionTokenKind.Identifier)
{
var member = _parser.BindMember((string)_parser.TokenData);
if (!(member is PropertyInfo property) ||
!IsNavigationProperty(property, out var itemType, out var isCollection))
{
_parser.ReportError($"Property '{_parser.TokenData}' is no navigation property");
return;
}
if (_clauses.ContainsKey(property))
{
_parser.ReportError($"Property '{_parser.TokenData}' is already expanded.");
return;
}
var clause = new ExpandClause(itemType, property, isCollection);
_clauses[property] = clause;
_parser.NextToken();
if (_parser.CurrentTokenKind == QueryExpressionTokenKind.OpenParenthesis)
{
_parser.NextToken();
ExpandItemOptions(clause);
}
}
}
private void ExpandSkip(ExpandClause clause)
{
if (!QueryExpressionParser.IsNumeric(_parser.CurrentTokenKind))
{
_parser.ReportError(
$"$expand($skip) does not specify a numerical value at position {_parser.Position}");
}
clause.Skip = new SkipQueryOption();
clause.Skip.Initialize(_parser.TokenData.ToString(), _modelStateDictionary);
_parser.NextToken();
}
private void ExpandOrder(ExpandClause clause)
{
clause.Orderby = new OrderByQueryOption(clause.ItemType);
clause.Orderby.Initialize(_parser, _modelStateDictionary);
}
private void ExpandFilter(ExpandClause clause)
{
clause.Filter = new FilterQueryOption(clause.ItemType);
clause.Filter.Initialize(_parser, _modelStateDictionary);
}
private void ExpandItemOptions(ExpandClause clause)
{
while (_parser.CurrentTokenKind == QueryExpressionTokenKind.Identifier)
{
var option = (string)_parser.TokenData;
Action <ExpandClause> handler;
switch (option)
{
case "$filter":
handler = ExpandFilter;
break;
case "$expand":
handler = NestedExpand;
break;
case "$orderby":
handler = ExpandOrder;
break;
case "$top":
handler = ExpandTop;
break;
case "$skip":
handler = ExpandSkip;
break;
default:
handler = null;
break;
}
;
if (handler != null)
{
_parser.NextToken();
if (_parser.CurrentTokenKind != QueryExpressionTokenKind.Equal)
{
_parser.ReportError($"Expected equals sign after $expand option {option}");
}
_parser.NextToken();
handler(clause);
if (_parser.CurrentTokenKind == QueryExpressionTokenKind.CloseParenthesis)
{
break;
}
if (_parser.CurrentTokenKind == QueryExpressionTokenKind.Semicolon)
{
_parser.NextToken();
}
}
else
{
break;
}
}
if (_parser.CurrentTokenKind != QueryExpressionTokenKind.CloseParenthesis)
{
_parser.ReportError($"Expected close parenthesis at position {_parser.Position}");
}
}
private void ExpandItemOptions(ExpandClause clause)
{
while (_parser.CurrentTokenKind == QueryExpressionTokenKind.Identifier)
{
var option = (string)_parser.TokenData;
Action <ExpandClause> handler;
if (QueryOptionKeys.FilterKeys.Contains(option))
{
handler = ExpandFilter;
}
else if (QueryOptionKeys.ExpandKeys.Contains(option))
{
handler = NestedExpand;
}
else if (QueryOptionKeys.OrderbyKeys.Contains(option))
{
handler = ExpandOrder;
}
else if (QueryOptionKeys.TopKeys.Contains(option))
{
handler = ExpandTop;
}
else if (QueryOptionKeys.SkipKeys.Contains(option))
{
handler = ExpandSkip;
}
else
{
handler = null;
}
if (handler != null)
{
_parser.NextToken();
if (_parser.CurrentTokenKind != QueryExpressionTokenKind.Equal)
{
_parser.ReportError($"Expected equals sign after $expand option {option}");
}
_parser.NextToken();
handler(clause);
if (_parser.CurrentTokenKind == QueryExpressionTokenKind.CloseParenthesis)
{
break;
}
if (_parser.CurrentTokenKind == QueryExpressionTokenKind.Semicolon)
{
_parser.NextToken();
}
}
else
{
break;
}
}
if (_parser.CurrentTokenKind != QueryExpressionTokenKind.CloseParenthesis)
{
_parser.ReportError($"Expected close parenthesis at position {_parser.Position}");
}
}
