, CommonExprSet
, Constant(..)
+ , Variable(..)
, CommonUnaryOp(..)
, CommonBinaryOp(..)
, CommonTrinaryOp(..)
, CommonSetOp(..)
+ , VariableShiftPredictOp(..)
+ , FixedShiftPredictOp(..)
+ , CommonValue(..)
, IterativeValue(..)
, AggregativeUnaryOp(..)
dsName = "foo"
-- , dsExpr = Previous :<: Const 100
-- , dsExpr = Var "foo" :<: Const 100
- , dsExpr = Average (Const 100 .*. Const 200 .*. HNil)
+ , dsExpr = AverageOf (Const 100 .*. Const 200 .*. HNil)
}
-class Show e => Expr e
+class (Show e, Eq e) => Expr e
class Expr e => CommonExpr e
class Expr e => IterativeExpr e
class Expr e => AggregativeExpr e
instance CommonExpr e => IterativeExpr e
-instance CommonExpr e => AggregativeExpr e
-class (Show es, HList es) => ExprSet es
+class (Show es, Eq es, HList es) => ExprSet es
instance ExprSet HNil
instance (Expr e, ExprSet es) => ExprSet (HCons e es)
-class (Show es, HList es) => CommonExprSet es
+class (Show es, Eq es, HList es) => CommonExprSet es
instance CommonExprSet es => ExprSet es
instance CommonExprSet HNil
instance (CommonExpr e, CommonExprSet es) => CommonExprSet (HCons e es)
-- Constants and variable names
data Constant
= Const !Double
- | Var !String
deriving (Show, Eq, Ord)
instance Expr Constant
instance CommonExpr Constant
+data Variable
+ = Var !String
+ deriving (Show, Eq, Ord)
+instance Expr Variable
+instance CommonExpr Variable
+
-- Common operators
data CommonUnaryOp a
= IsUnknown !a
| Deg2Rad !a
| Rad2Deg !a
| Abs !a
+ | Trend !Variable !a
+ | TrendNan !Variable !a
deriving (Show, Eq, Ord)
instance Expr a => Expr (CommonUnaryOp a)
instance CommonExpr a => CommonExpr (CommonUnaryOp a)
-- multiple values onto the stack...
data CommonSetOp es
- = Average !es
+ = AverageOf !es
deriving (Show, Eq, Ord)
instance ExprSet es => Expr (CommonSetOp es)
instance CommonExprSet es => CommonExpr (CommonSetOp es)
+data VariableShiftPredictOp ss w
+ = VariableShiftPredictAverage !ss !w !Variable
+ | VariableShiftPredictSigma !ss !w !Variable
+ deriving (Show, Eq, Ord)
+instance (ExprSet ss, Expr w)
+ => Expr (VariableShiftPredictOp ss w)
+instance (CommonExprSet ss, CommonExpr w)
+ => CommonExpr (VariableShiftPredictOp ss w)
+
+data FixedShiftPredictOp sm w
+ = FixedShiftPredictAverage !sm !w !Variable
+ | FixedShiftPredictSigma !sm !w !Variable
+ deriving (Show, Eq, Ord)
+instance (Expr sm, Expr w)
+ => Expr (FixedShiftPredictOp sm w)
+instance (CommonExpr sm, CommonExpr w)
+ => CommonExpr (FixedShiftPredictOp sm w)
+
+-- Common special values
+data CommonValue
+ = Unknown
+ | Infinity
+ | NegativeInfinity
+ | Now
+ deriving (Show, Eq, Ord)
+instance Expr CommonValue
+instance CommonExpr CommonValue
+
-- Iterative special values
data IterativeValue
= Previous
+ | PreviousOf !Variable
+ | Count
+ | TakenTime
+ | TakenLocalTime
deriving (Show, Eq, Ord)
instance Expr IterativeValue
instance IterativeExpr IterativeValue
--- Aggregative operators
-data AggregativeUnaryOp a
- = Maximum !a
+-- Aggregative operators (fairly restricted due to rrdtool's
+-- restriction)
+data AggregativeUnaryOp
+ = Maximum !Variable
+ | Minimum !Variable
+ | Average !Variable
+ | StandardDeviation !Variable
+ | First !Variable
+ | Last !Variable
+ | Total !Variable
+ | Percent !Variable !Constant
+ | PercentNan !Variable !Constant
+ | LSLSlope !Variable
+ | LSLInt !Variable
+ | LSLCorrel !Variable
deriving (Show, Eq, Ord)
-instance Expr a => Expr (AggregativeUnaryOp a)
-instance AggregativeExpr a => AggregativeExpr (AggregativeUnaryOp a)
+instance Expr AggregativeUnaryOp
+instance AggregativeExpr AggregativeUnaryOp
-- |The 'createRRD' function lets you set up new Round Robin Database
-- (RRD) files. The file is created at its final, full size and filled