private SeparatedSyntaxList <SelectColumnSyntax> ParseSelectColumnList()
{
var columnsWithCommas = new List <SyntaxNodeOrToken>();
while (true)
{
var oldIndex = _tokenIndex;
var selectColumn = ParseSelectColumn();
columnsWithCommas.Add(selectColumn);
if (_tokenIndex == oldIndex)
{
SkipTokens(t => SyntaxFacts.CanFollowSelectColumn(t.Kind));
}
if (Current.Kind != SyntaxKind.CommaToken && !SyntaxFacts.CanStartExpression(Current.Kind))
{
break;
}
var comma = Match(SyntaxKind.CommaToken);
columnsWithCommas.Add(comma);
}
return(new SeparatedSyntaxList <SelectColumnSyntax>(columnsWithCommas));
}
private AliasSyntax ParseOptionalColumnAlias()
{
var isAlias = Peek(0).Kind == SyntaxKind.AsKeyword ||
Peek(0).Kind == SyntaxKind.IdentifierToken && SyntaxFacts.CanFollowSelectColumn(Peek(1).Kind);
return(isAlias
? ParseAlias()
: null);
}
