# QuanTAlib: Warn about LINQ in potential hot paths
# DCT rule 1: Hot paths allocation-free (no heap alloc); GC pressure enemy

id: warn-linq-methods
language: csharp
severity: warning
message: "LINQ method detected - verify this is not in a hot path (Update/Calculate). LINQ allocates and causes GC pressure."
note: "DCT rule 1: Hot paths must be allocation-free. Replace LINQ with for loops or Span operations in performance-critical code."
rule:
  any:
    - pattern: $EXPR.Where($$$)
    - pattern: $EXPR.Select($$$)
    - pattern: $EXPR.OrderBy($$$)
    - pattern: $EXPR.OrderByDescending($$$)
    - pattern: $EXPR.GroupBy($$$)
    - pattern: $EXPR.ToList()
    - pattern: $EXPR.ToArray()
    - pattern: $EXPR.ToDictionary($$$)
    - pattern: $EXPR.First($$$)
    - pattern: $EXPR.FirstOrDefault($$$)
    - pattern: $EXPR.Last($$$)
    - pattern: $EXPR.LastOrDefault($$$)
    - pattern: $EXPR.Single($$$)
    - pattern: $EXPR.SingleOrDefault($$$)
    - pattern: $EXPR.Any($$$)
    - pattern: $EXPR.All($$$)
    - pattern: $EXPR.Count($$$)
    - pattern: $EXPR.Sum($$$)
    - pattern: $EXPR.Average($$$)
    - pattern: $EXPR.Min($$$)
    - pattern: $EXPR.Max($$$)
    - pattern: $EXPR.Aggregate($$$)
    - pattern: $EXPR.Distinct($$$)
    - pattern: $EXPR.Skip($$$)
    - pattern: $EXPR.Take($$$)
    - pattern: $EXPR.Zip($$$)
    - pattern: $EXPR.Concat($$$)