private bool ParseListExpressionStep(ref LightList <ASTNode> retn)
{
while (true)
{
int commaIndex = tokenStream.FindNextIndexAtSameLevel(ExpressionTokenType.Comma);
if (commaIndex != -1)
{
ExpressionParser parser = CreateUndelimitedSubParser(commaIndex);
tokenStream.Advance();
bool valid = parser.ParseListExpressionStep(ref retn);
parser.Release();
if (!valid)
{
ReleaseList(retn);
return(false);
}
}
else
{
ASTNode node = ParseLoop();
if (node == null)
{
return(false);
}
retn.Add(node);
return(true);
}
}
}
private bool ParseListExpression(ref LightList <ASTNode> retn, ExpressionTokenType openExpressionToken, ExpressionTokenType closeExpressionToken)
{
if (tokenStream.Current != openExpressionToken)
{
return(false);
}
int range = tokenStream.FindMatchingIndex(openExpressionToken, closeExpressionToken);
tokenStream.Save();
if (range == 1)
{
tokenStream.Advance(2);
retn = LightList <ASTNode> .Get();
return(true);
}
if (retn != null)
{
LightList <ASTNode> .Release(ref retn);
}
retn = LightList <ASTNode> .Get();
//todo find next comma at same level (meaning not inside [ or ( or <
ExpressionParser parser = CreateSubParser(range);
bool valid = parser.ParseListExpressionStep(ref retn);
parser.Release();
if (!valid)
{
tokenStream.Restore();
ReleaseList(retn);
return(false);
}
return(true);
}
