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·1733 lines (1420 loc) · 112 KB
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// Copyright (c) Microsoft Corporation. All Rights Reserved. See License.txt in the project root for license information.
namespace Microsoft.FSharp.Linq
open System
open System.Linq
open System.Collections
open System.Collections.Generic
open Microsoft.FSharp
open Microsoft.FSharp.Core
open Microsoft.FSharp.Core.Operators
open Microsoft.FSharp.Collections
open Microsoft.FSharp.Quotations
open Microsoft.FSharp.Linq.RuntimeHelpers
#nowarn "64"
[<NoComparison; NoEquality; Sealed>]
type QuerySource<'T, 'Q> (source: seq<'T>) =
member __.Source = source
[<AutoOpen>]
module Helpers =
// This helps the somewhat complicated type inference for AverageByNullable and SumByNullable, by making both type in a '+' the same
let inline plus (x:'T) (y:'T) = Checked.(+) x y
let inline checkNonNull argName arg =
match box arg with
| null -> nullArg argName
| _ -> ()
let checkThenBySource (source: seq<'T>) =
match source with
| :? System.Linq.IOrderedEnumerable<'T> as source -> source
| _ -> invalidArg "source" (SR.GetString(SR.thenByError))
// used so we can define the implementation of QueryBuilder before the Query module (so in Query we can safely use methodhandleof)
module ForwardDeclarations =
type IQueryMethods =
abstract Execute : Expr<'T> -> 'U
abstract EliminateNestedQueries : Expr -> Expr
let mutable Query =
{
new IQueryMethods with
member this.Execute(_) = failwith "IQueryMethods.Execute should never be called"
member this.EliminateNestedQueries(_) = failwith "IQueryMethods.EliminateNestedQueries should never be called"
}
type QueryBuilder() =
member __.For (source:QuerySource<'T,'Q>, body: 'T -> QuerySource<'Result,'Q2>) : QuerySource<'Result,'Q> = QuerySource (Seq.collect (fun x -> (body x).Source) source.Source)
member __.Zero () = QuerySource Seq.empty
member __.Yield value = QuerySource (Seq.singleton value)
member __.YieldFrom (computation: QuerySource<'T,'Q>) : QuerySource<'T,'Q> = computation
member __.Quote (q:Quotations.Expr<'T>) = q
member __.Source (source: IQueryable<'T>) = QuerySource source
member __.Source (source: IEnumerable<'T>) : QuerySource<'T,System.Collections.IEnumerable> = QuerySource source
member __.Contains(source:QuerySource<'T,'Q>,key) = Enumerable.Contains(source.Source, key)
member __.Select(source:QuerySource<'T,'Q>,projection) : QuerySource<'U,'Q>= QuerySource (Seq.map projection source.Source)
member __.Where(source:QuerySource<'T,'Q>,predicate) : QuerySource<'T,'Q> = QuerySource (Enumerable.Where (source.Source, Func<_,_>(predicate)) )
member __.Last (source:QuerySource<'T,'Q>) = Enumerable.Last source.Source
member __.LastOrDefault (source:QuerySource<'T,'Q>) = Enumerable.LastOrDefault source.Source
member __.ExactlyOne (source:QuerySource<'T,'Q>) = Enumerable.Single source.Source
member __.ExactlyOneOrDefault (source:QuerySource<'T,'Q>) = Enumerable.SingleOrDefault source.Source
member __.Count (source:QuerySource<'T,'Q>) = Enumerable.Count source.Source
member __.Distinct (source : QuerySource<'T,'Q> when 'T : equality) : QuerySource<'T,'Q> = QuerySource (Enumerable.Distinct source.Source)
member __.Exists(source: QuerySource<'T,'Q>,predicate) = Enumerable.Any (source.Source, Func<_,_>(predicate))
member __.All (source: QuerySource<'T,'Q>,predicate) = Enumerable.All (source.Source, Func<_,_>(predicate))
member __.Head (source: QuerySource<'T,'Q>) = Enumerable.First source.Source
member __.Nth (source: QuerySource<'T,'Q>, index) = Enumerable.ElementAt (source.Source, index)
//let reduceBy projection reduction source = source |> Seq.map projection |> Seq.reduce reduction
member __.Skip (source: QuerySource<'T,'Q>,count) : QuerySource<'T,'Q> = QuerySource (Enumerable.Skip (source.Source, count))
member __.SkipWhile (source: QuerySource<'T,'Q>,predicate) : QuerySource<'T,'Q> = QuerySource (Enumerable.SkipWhile (source.Source, Func<_,_>(predicate)))
member __.Take (source: QuerySource<'T,'Q>,count) : QuerySource<'T,'Q> = QuerySource (Enumerable.Take (source.Source, count))
member __.TakeWhile (source: QuerySource<'T,'Q>,predicate) : QuerySource<'T,'Q> = QuerySource (Enumerable.TakeWhile (source.Source, Func<_,_>(predicate)))
member __.Find (source: QuerySource<'T,'Q>,predicate) = Enumerable.First (source.Source, Func<_,_>(predicate))
member __.HeadOrDefault (source:QuerySource<'T,'Q>) = Enumerable.FirstOrDefault source.Source
member __.MinBy<'T,'Q,'Key when 'Key : equality and 'Key : comparison> (source:QuerySource<'T,'Q>, valueSelector : 'T -> 'Key) =
Enumerable.Min(source.Source, Func<'T,'Key>(valueSelector))
member __.MaxBy<'T,'Q,'Key when 'Key : equality and 'Key : comparison> (source:QuerySource<'T,'Q>, valueSelector : 'T -> 'Key) =
Enumerable.Max(source.Source, Func<'T,'Key>(valueSelector))
member __.MinByNullable<'T,'Q,'Key when 'Key : equality and 'Key : comparison and 'Key : (new : unit -> 'Key) and 'Key : struct and 'Key :> ValueType> (source:QuerySource<'T,'Q>, valueSelector : 'T -> Nullable<'Key>) =
Enumerable.Min(source.Source, Func<'T, Nullable<'Key>>(valueSelector))
member __.MaxByNullable<'T,'Q,'Key when 'Key : equality and 'Key : comparison and 'Key : (new : unit -> 'Key) and 'Key : struct and 'Key :> ValueType> (source:QuerySource<'T,'Q>, valueSelector : 'T -> Nullable<'Key>) =
Enumerable.Max(source.Source, Func<'T, Nullable<'Key>>(valueSelector))
member inline __.SumByNullable<'T, 'Q, ^Value
when ^Value :> ValueType
and ^Value : struct
and ^Value : (new : unit -> ^Value)
and ^Value : (static member ( + ) : ^Value * ^Value -> ^Value)
and ^Value : (static member Zero : ^Value)
and default ^Value : int>
(source: QuerySource<'T,'Q>, valueSelector : 'T -> Nullable< ^Value >) : Nullable< ^Value > =
let source = source.Source
checkNonNull "source" source
use e = source.GetEnumerator()
let mutable acc : ^Value = LanguagePrimitives.GenericZero< (^Value) >
while e.MoveNext() do
let v : Nullable< ^Value > = valueSelector e.Current
if v.HasValue then
acc <- plus acc (v.Value : ^Value)
Nullable acc
member inline __.AverageByNullable< 'T, 'Q, ^Value
when ^Value :> ValueType
and ^Value : struct
and ^Value : (new : unit -> ^Value)
and ^Value : (static member ( + ) : ^Value * ^Value -> ^Value)
and ^Value : (static member DivideByInt : ^Value * int -> ^Value)
and ^Value : (static member Zero : ^Value)
and default ^Value : float >
(source: QuerySource<'T,'Q>, projection: 'T -> Nullable< ^Value >) : Nullable< ^Value > =
let source = source.Source
checkNonNull "source" source
use e = source.GetEnumerator()
let mutable acc = LanguagePrimitives.GenericZero< (^Value) >
let mutable count = 0
while e.MoveNext() do
let v = projection e.Current
if v.HasValue then
acc <- plus acc v.Value
count <- count + 1
if count = 0 then Nullable() else Nullable(LanguagePrimitives.DivideByInt< (^Value) > acc count)
member inline __.AverageBy< 'T, 'Q, ^Value
when ^Value : (static member ( + ) : ^Value * ^Value -> ^Value)
and ^Value : (static member DivideByInt : ^Value * int -> ^Value)
and ^Value : (static member Zero : ^Value)
and default ^Value : float >
(source: QuerySource<'T,'Q>, projection: 'T -> ^Value) : ^Value =
let source = source.Source
checkNonNull "source" source
use e = source.GetEnumerator()
let mutable acc = LanguagePrimitives.GenericZero< (^U) >
let mutable count = 0
while e.MoveNext() do
acc <- plus acc (projection e.Current)
count <- count + 1
if count = 0 then
invalidOp "source"
LanguagePrimitives.DivideByInt< (^U) > acc count
member inline __.SumBy< 'T, 'Q, ^Value
when ^Value : (static member ( + ) : ^Value * ^Value -> ^Value)
and ^Value : (static member Zero : ^Value)
and default ^Value : int >
(source:QuerySource<'T,'Q>, projection : ('T -> ^Value)) : ^Value =
Seq.sumBy projection source.Source
member __.GroupBy (source: QuerySource<'T,'Q>, keySelector : _ -> 'Key) : QuerySource<_,'Q> when 'Key : equality =
QuerySource (Enumerable.GroupBy(source.Source, Func<_,_>(keySelector)))
member __.SortBy (source: QuerySource<'T,'Q>, keySelector : 'T -> 'Key) : QuerySource<'T,'Q> when 'Key : equality and 'Key : comparison =
QuerySource (Enumerable.OrderBy(source.Source, Func<_,_>(keySelector)))
member __.SortByDescending (source: QuerySource<'T,'Q>, keySelector : 'T -> 'Key) : QuerySource<'T,'Q> when 'Key : equality and 'Key : comparison =
QuerySource (Enumerable.OrderByDescending(source.Source, Func<_,_>(keySelector)))
member __.ThenBy (source: QuerySource<'T,'Q>, keySelector : 'T -> 'Key) : QuerySource<'T,'Q> when 'Key : equality and 'Key : comparison =
QuerySource (Enumerable.ThenBy(checkThenBySource source.Source, Func<_,_>(keySelector)))
member __.ThenByDescending (source: QuerySource<'T,'Q>, keySelector : 'T -> 'Key) : QuerySource<'T,'Q> when 'Key : equality and 'Key : comparison =
QuerySource (Enumerable.ThenByDescending(checkThenBySource source.Source, Func<_,_>(keySelector)))
member __.SortByNullable (source: QuerySource<'T,'Q>, keySelector : 'T -> Nullable<'Key>) : QuerySource<'T,'Q> when 'Key : equality and 'Key : comparison =
QuerySource (Enumerable.OrderBy(source.Source, Func<_,_>(keySelector)))
member __.SortByNullableDescending (source: QuerySource<'T,'Q>, keySelector : 'T -> Nullable<'Key>) : QuerySource<'T,'Q> when 'Key : equality and 'Key : comparison =
QuerySource (Enumerable.OrderByDescending(source.Source, Func<_,_>(keySelector)))
member __.ThenByNullable (source: QuerySource<'T,'Q>, keySelector : 'T -> Nullable<'Key>) : QuerySource<'T,'Q> when 'Key : equality and 'Key : comparison =
QuerySource (Enumerable.ThenBy(checkThenBySource source.Source, Func<_,_>(keySelector)))
member __.ThenByNullableDescending (source: QuerySource<'T,'Q>, keySelector : 'T -> Nullable<'Key>) : QuerySource<'T,'Q> when 'Key : equality and 'Key : comparison =
QuerySource (Enumerable.ThenByDescending(checkThenBySource source.Source, Func<_,_>(keySelector)))
member __.GroupValBy<'T,'Key,'Result, 'Q when 'Key : equality > (source:QuerySource<'T,'Q>, resultSelector: 'T -> 'Result, keySelector: 'T -> 'Key) : QuerySource<IGrouping<'Key,'Result>,'Q> =
QuerySource (Enumerable.GroupBy(source.Source, Func<'T,'Key>(keySelector), Func<'T,'Result>(resultSelector)))
#if SUPPORT_ZIP_IN_QUERIES
member __.Zip (firstSource, secondSource, elementSelector) =
Enumerable.Zip(firstSource, secondSource, Func<_,_,_>(elementSelector) )
#endif
member __.Join (outerSource: QuerySource<_,'Q>, innerSource: QuerySource<_,'Q>, outerKeySelector, innerKeySelector, resultSelector) : QuerySource<_,'Q> =
QuerySource (Enumerable.Join(outerSource.Source, innerSource.Source, Func<_,_>(outerKeySelector), Func<_,_>(innerKeySelector), Func<_,_,_>(resultSelector)))
member __.GroupJoin (outerSource: QuerySource<_,'Q>, innerSource: QuerySource<_,'Q>, outerKeySelector, innerKeySelector, resultSelector: _ -> seq<_> -> _) : QuerySource<_,'Q> =
QuerySource (Enumerable.GroupJoin(outerSource.Source, innerSource.Source, Func<_,_>(outerKeySelector), Func<_,_>(innerKeySelector), Func<_,_,_>(fun x g -> resultSelector x g)))
member __.LeftOuterJoin (outerSource:QuerySource<_,'Q>, innerSource: QuerySource<_,'Q>, outerKeySelector, innerKeySelector, resultSelector: _ -> seq<_> -> _) : QuerySource<_,'Q> =
QuerySource (Enumerable.GroupJoin(outerSource.Source, innerSource.Source, Func<_,_>(outerKeySelector), Func<_,_>(innerKeySelector), Func<_,_,_>(fun x g -> resultSelector x (g.DefaultIfEmpty()))))
member __.RunQueryAsValue (q:Quotations.Expr<'T>) : 'T = ForwardDeclarations.Query.Execute q
member __.RunQueryAsEnumerable (q:Quotations.Expr<QuerySource<'T,IEnumerable>>) : IEnumerable<'T> =
let queryAfterEliminatingNestedQueries = ForwardDeclarations.Query.EliminateNestedQueries q
let queryAfterCleanup = Microsoft.FSharp.Linq.RuntimeHelpers.Adapters.CleanupLeaf queryAfterEliminatingNestedQueries
(LeafExpressionConverter.EvaluateQuotation queryAfterCleanup :?> QuerySource<'T,IEnumerable>).Source
member __.RunQueryAsQueryable (q:Quotations.Expr<QuerySource<'T,IQueryable>>) : IQueryable<'T> = ForwardDeclarations.Query.Execute q
member this.Run q = this.RunQueryAsQueryable q
namespace Microsoft.FSharp.Linq.QueryRunExtensions
open Microsoft.FSharp.Core
[<AutoOpen>]
module LowPriority =
type Microsoft.FSharp.Linq.QueryBuilder with
[<CompiledName("RunQueryAsValue")>]
member this.Run (q: Microsoft.FSharp.Quotations.Expr<'T>) = this.RunQueryAsValue q
[<AutoOpen>]
module HighPriority =
type Microsoft.FSharp.Linq.QueryBuilder with
[<CompiledName("RunQueryAsEnumerable")>]
member this.Run (q: Microsoft.FSharp.Quotations.Expr<Microsoft.FSharp.Linq.QuerySource<'T,System.Collections.IEnumerable>>) = this.RunQueryAsEnumerable q
namespace Microsoft.FSharp.Linq
open System
open System.Linq
open System.Collections
open System.Collections.Generic
open System.Linq.Expressions
open System.Reflection
open Microsoft.FSharp
open Microsoft.FSharp.Core
open Microsoft.FSharp.Core.Operators
open Microsoft.FSharp.Core.LanguagePrimitives.IntrinsicOperators
open Microsoft.FSharp.Collections
open Microsoft.FSharp.Reflection
open Microsoft.FSharp.Linq
open Microsoft.FSharp.Linq.RuntimeHelpers.Adapters
open Microsoft.FSharp.Linq.RuntimeHelpers
open Microsoft.FSharp.Linq.RuntimeHelpers.LeafExpressionConverter
open Microsoft.FSharp.Quotations
open Microsoft.FSharp.Quotations.Patterns
open Microsoft.FSharp.Quotations.DerivedPatterns
open Microsoft.FSharp.Linq.QueryRunExtensions
#if FX_RESHAPED_REFLECTION
open PrimReflectionAdapters
open ReflectionAdapters
#endif
[<CompilationRepresentation(CompilationRepresentationFlags.ModuleSuffix)>]
module Query =
let ConvVar (v: Var) =
Expression.Parameter(v.Type, v.Name)
let asExpr x = (x :> Expression)
let (|Getter|_|) (prop: PropertyInfo) =
match prop.GetGetMethod(true) with
| null -> None
| v -> Some v
// Match 'f x'
let (|SpecificCall1|_|) q =
let (|CallQ|_|) = (|SpecificCallToMethod|_|) q
function
| CallQ (Some builderObj, tyargs, [arg1]) -> Some(builderObj, tyargs, arg1)
| _ -> None
// Match 'f x y' or 'f (x,y)'
let (|SpecificCall2|_|) q =
let (|CallQ|_|) = (|SpecificCallToMethod|_|) q
function
| CallQ (Some builderObj, tyargs, [arg1;arg2]) -> Some(builderObj, tyargs, arg1, arg2)
| _ -> None
// Match 'f x y z' or 'f (x,y,z)'
let (|SpecificCall3|_|) q =
let (|CallQ|_|) = (|SpecificCallToMethod|_|) q
function
| CallQ (Some builderObj, tyargs, [arg1;arg2;arg3]) -> Some(builderObj, tyargs, arg1, arg2, arg3)
| _ -> None
/// (fun (x,y) -> z) is represented as 'fun p -> let x = p#0 let y = p#1' etc.
/// This reverses this encoding, but does not de-tuple the input variable into multiple variables.
let (|LambdaNoDetupling|_|) (lam: Expr) =
/// Strip off the 'let' bindings for an LambdaNoDetupling
let rec stripSuccessiveProjLets (p:Var) n expr =
match expr with
| Let(v1,(TupleGet(Var pA,m) as e1),rest)
when p = pA && m = n->
let restvs,b = stripSuccessiveProjLets p (n+1) rest
(v1,e1)::restvs, b
| _ -> ([],expr)
match lam with
| Lambda(v,body) ->
let projs,b = stripSuccessiveProjLets v 0 body
Some(v, projs, b)
| _ -> None
let restoreTupleProjections projs b = List.foldBack (fun (v,e) acc -> Expr.Let (v,e,acc)) projs b
let (|LambdasNoDetupling|_|) (inpExpr: Expr) =
let rec loop rvs rprojs e =
match e with
| LambdaNoDetupling(v,projs,body) -> loop (v::rvs) (projs::rprojs) body
| _ ->
match rvs with
| [] -> None
| _ -> Some(List.rev rvs,restoreTupleProjections (List.concat (List.rev rprojs)) e)
loop [] [] inpExpr
let GetGenericMethodDefinition (methInfo:MethodInfo) =
if methInfo.IsGenericMethod then methInfo.GetGenericMethodDefinition() else methInfo
let CallGenericStaticMethod (methHandle:System.RuntimeMethodHandle) =
let methInfo = methHandle |> System.Reflection.MethodInfo.GetMethodFromHandle :?> MethodInfo
fun (tyargs: Type list, args: obj list) ->
let methInfo = if methInfo.IsGenericMethod then methInfo.MakeGenericMethod(Array.ofList tyargs) else methInfo
try
methInfo.Invoke(null, Array.ofList args)
with :? System.Reflection.TargetInvocationException as exn ->
raise exn.InnerException
let CallGenericInstanceMethod (methHandle:System.RuntimeMethodHandle) =
let methInfo = methHandle |> System.Reflection.MethodInfo.GetMethodFromHandle :?> MethodInfo
fun (objExpr:obj, tyargs: Type list, args: obj list) ->
let methInfo = if methInfo.IsGenericMethod then methInfo.MakeGenericMethod(Array.ofList tyargs) else methInfo
try
methInfo.Invoke(objExpr, Array.ofList args)
with :? System.Reflection.TargetInvocationException as exn ->
raise exn.InnerException
let BindGenericStaticMethod (methInfo:MethodInfo) tyargs =
if methInfo.IsGenericMethod then
methInfo.GetGenericMethodDefinition().MakeGenericMethod(Array.ofList tyargs)
else
methInfo
let MakeGenericStaticMethod (methHandle:System.RuntimeMethodHandle) =
let methInfo = methHandle |> System.Reflection.MethodInfo.GetMethodFromHandle :?> MethodInfo
(fun (tyargs: Type list, args: Expr list) -> Expr.Call(BindGenericStaticMethod methInfo tyargs, args))
let MakeGenericInstanceMethod (methHandle:System.RuntimeMethodHandle) =
let methInfo = methHandle |> System.Reflection.MethodInfo.GetMethodFromHandle :?> MethodInfo
(fun (obj:Expr, tyargs: Type list, args: Expr list) -> Expr.Call(obj, BindGenericStaticMethod methInfo tyargs, args))
let ImplicitExpressionConversionHelperMethodInfo =
methodhandleof (fun e -> LeafExpressionConverter.ImplicitExpressionConversionHelper e)
|> System.Reflection.MethodInfo.GetMethodFromHandle
:?> MethodInfo
let MakeImplicitExpressionConversion (x:Expr) = Expr.Call(ImplicitExpressionConversionHelperMethodInfo.MakeGenericMethod [| x.Type |], [ x ])
let NT = typedefof<System.Nullable<int>>
let FT1 = typedefof<System.Func<_,_>>
let FT2 = typedefof<System.Func<_,_,_>>
let boolTy = typeof<bool>
let MakeNullableTy ty = NT.MakeGenericType [| ty |]
let MakeQueryFuncTy (dty, rty) = FT1.MakeGenericType [| dty; rty |]
let MakeQueryFunc2Ty (dty1, dty2, rty) = FT2.MakeGenericType [| dty1; dty2; rty |]
let IEnumerableTypeDef = typedefof<IEnumerable<_>>
let IQueryableTypeDef = typedefof<IQueryable<_>>
let QuerySourceTypeDef = typedefof<QuerySource<_,_>>
let MakeIEnumerableTy dty= IEnumerableTypeDef.MakeGenericType [| dty|]
let MakeIQueryableTy dty= IQueryableTypeDef.MakeGenericType [| dty|]
let IsQuerySourceTy (ty: System.Type) = ty.IsGenericType && ty.GetGenericTypeDefinition() = QuerySourceTypeDef
let IsIQueryableTy (ty: System.Type) = ty.IsGenericType && ty.GetGenericTypeDefinition() = IQueryableTypeDef
let IsIEnumerableTy (ty: System.Type) = ty.IsGenericType && ty.GetGenericTypeDefinition() = IEnumerableTypeDef
// Check a tag type on QuerySource is IQueryable
let qTyIsIQueryable (ty : System.Type) = not (ty.Equals(typeof<IEnumerable>))
let FuncExprToDelegateExpr (srcTy, targetTy, v, body) =
Expr.NewDelegate(Linq.Expressions.Expression.GetFuncType [| srcTy; targetTy |], [v], body)
/// Project F# function expressions to Linq LambdaExpression nodes
let FuncExprToLinqFunc2Expression (srcTy, targetTy, v, body) =
FuncExprToDelegateExpr(srcTy, targetTy, v, body) |> LeafExpressionConverter.QuotationToExpression
let FuncExprToLinqFunc2 (srcTy, targetTy, v, body) =
FuncExprToDelegateExpr(srcTy, targetTy, v, body) |> LeafExpressionConverter.EvaluateQuotation
let MakersCallers F = CallGenericStaticMethod F, MakeGenericStaticMethod F
let MakersCallersInstance F = CallGenericInstanceMethod F, MakeGenericInstanceMethod F
let MakersCallers2 FQ FE = MakersCallers FQ, MakersCallers FE
let MakeOrCallContainsOrElementAt FQ FE =
let (CQ, MQ), (CE, ME) = MakersCallers2 FQ FE
let Make (isIQ, srcItemTy:Type, src:Expr, key:Expr) =
if isIQ then
//let key = MakeImplicitExpressionConversion key
MQ ([srcItemTy], [src; key])
else
ME ([srcItemTy], [src; key])
let Call (isIQ, srcItemTy, src:obj, key:Expr) =
let key = key |> LeafExpressionConverter.EvaluateQuotation
let C = if isIQ then CQ else CE
C ([srcItemTy], [src;box key])
Make, Call
let MakeContains, CallContains =
let FQ = methodhandleof (fun (x,y) -> System.Linq.Queryable.Contains(x,y))
let FE = methodhandleof (fun (x,y) -> Enumerable.Contains(x, y))
MakeOrCallContainsOrElementAt FQ FE
let MakeElementAt, CallElementAt =
let FQ = methodhandleof (fun (x,y) -> System.Linq.Queryable.ElementAt(x,y))
let FE = methodhandleof (fun (x,y) -> Enumerable.ElementAt(x,y))
MakeOrCallContainsOrElementAt FQ FE
let MakeOrCallMinByOrMaxBy FQ FE =
let (CQ, MQ), (CE, ME) = MakersCallers2 FQ FE
let Make (isIQ, src:Expr, v:Var, valSelector:Expr) =
let srcItemTy = v.Type
let keyElemTy = valSelector.Type
let valSelector = FuncExprToDelegateExpr (srcItemTy, keyElemTy, v, valSelector)
if isIQ then
let valSelector = MakeImplicitExpressionConversion valSelector
MQ ([srcItemTy;keyElemTy], [src;valSelector])
else
ME ([srcItemTy;keyElemTy], [src;valSelector])
let Call (isIQ, srcItemTy:Type,_keyItemTy:Type, src:obj, keyElemTy:Type, v:Var, res:Expr) =
if isIQ then
let selector = FuncExprToLinqFunc2Expression (srcItemTy, keyElemTy, v, res)
CQ ([srcItemTy;keyElemTy], [src;box selector])
else
let selector = FuncExprToLinqFunc2 (srcItemTy, keyElemTy, v, res)
CE ([srcItemTy;keyElemTy], [src;selector])
Make, Call
let (MakeMinBy: bool * Expr * Var * Expr -> Expr), (CallMinBy : bool * Type * Type * obj * Type * Var * Expr -> obj) =
let FQ = methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.Min(x,y))
let FE = methodhandleof (fun (x,y:Func<_,'Result>) -> Enumerable.Min(x,y))
MakeOrCallMinByOrMaxBy FQ FE
let MakeMaxBy, CallMaxBy =
let FQ = methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.Max(x, y))
let FE = methodhandleof (fun (x,y: Func<_,'Result>) -> Enumerable.Max(x, y))
MakeOrCallMinByOrMaxBy FQ FE
let MakeMinByNullable, CallMinByNullable =
// Note there is no separate LINQ overload for Min on nullables - the one implementation just magically skips nullable elements
let FQ = methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.Min(x, y))
let FE = methodhandleof (fun (x,y:Func<_,'Result>) -> Enumerable.Min(x, y))
MakeOrCallMinByOrMaxBy FQ FE
let MakeMaxByNullable, CallMaxByNullable =
// Note there is no separate LINQ overload for Max on nullables - the one implementation just magically skips nullable elements
let FQ = methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.Max(x,y))
let FE = methodhandleof (fun (x,y:Func<_,'Result>) -> Enumerable.Max(x,y))
MakeOrCallMinByOrMaxBy FQ FE
let MakeOrCallAnyOrAllOrFirstFind FQ FE =
let (CQ, MQ), (CE, ME) = MakersCallers2 FQ FE
let Make (isIQ, src:Expr, v:Var, predicate:Expr) =
let srcItemTy= v.Type
let predicate = FuncExprToDelegateExpr (srcItemTy, boolTy, v, predicate)
if isIQ then
let predicate = MakeImplicitExpressionConversion predicate
MQ ([srcItemTy], [src; predicate])
else
ME ([srcItemTy], [src; predicate])
let Call (isIQ, srcItemTy:Type, src:obj, v:Var, res:Expr) =
if isIQ then
let selector = FuncExprToLinqFunc2Expression (srcItemTy, boolTy, v, res)
CQ ([srcItemTy], [src;box selector])
else
let selector = FuncExprToLinqFunc2 (srcItemTy, boolTy, v, res)
CE ([srcItemTy], [src;selector])
Make, Call
let MakeAny, CallAny =
let FQ = methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.Any(x,y))
let FE = methodhandleof (fun (x,y:Func<_,_>) -> Enumerable.Any(x,y))
MakeOrCallAnyOrAllOrFirstFind FQ FE
let MakeAll, CallAll =
let FQ = methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.All(x,y))
let FE = methodhandleof (fun (x,y:Func<_,_>) -> Enumerable.All(x,y))
MakeOrCallAnyOrAllOrFirstFind FQ FE
let MakeFirstFind, CallFirstFind =
let FQ = methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.First(x,y))
let FE = methodhandleof (fun (x,y:Func<_,_>) -> Enumerable.First(x,y))
MakeOrCallAnyOrAllOrFirstFind FQ FE
let MakeOrCallAverageByOrSumByGeneric (isNullable,fq_double, fq_single, fq_decimal, fq_int32, fq_int64, fe_double, fe_single, fe_decimal, fe_int32, fe_int64, FE) =
let (cq_double, mq_double), (ce_double, me_double) = MakersCallers2 fq_double fe_double
let (cq_single, mq_single), (ce_single, me_single) = MakersCallers2 fq_single fe_single
let (cq_decimal, mq_decimal), (ce_decimal, me_decimal) = MakersCallers2 fq_decimal fe_decimal
let (cq_int32, mq_int32), (ce_int32, me_int32) = MakersCallers2 fq_int32 fe_int32
let (cq_int64, mq_int64), (ce_int64, me_int64) = MakersCallers2 fq_int64 fe_int64
// The F# implementation is an instance method on QueryBuilder
let (CE, ME) = MakersCallersInstance FE
let failDueToUnsupportedInputTypeInSumByOrAverageBy() = invalidOp (SR.GetString(SR.failDueToUnsupportedInputTypeInSumByOrAverageBy))
let Make (qb:Expr,isIQ, src:Expr, v:Var, res:Expr) =
let srcItemTy = v.Type
let resTy = res.Type
let resTyNoNullable =
if isNullable then
assert resTy.IsGenericType;
assert (resTy.GetGenericTypeDefinition() = typedefof<Nullable<int>>);
resTy.GetGenericArguments().[0]
else
resTy
let selector = FuncExprToDelegateExpr (srcItemTy, resTy, v, res)
if isIQ then
let selector = MakeImplicitExpressionConversion selector
let maker =
match resTyNoNullable with
| ty when ty = typeof<double> -> mq_double
| ty when ty = typeof<single> -> mq_single
| ty when ty = typeof<decimal> -> mq_decimal
| ty when ty = typeof<int32> -> mq_int32
| ty when ty = typeof<int64> -> mq_int64
| _ -> failDueToUnsupportedInputTypeInSumByOrAverageBy()
maker ([srcItemTy], [src;selector])
else
// Try to dynamically invoke a LINQ method if one exists, since these may be optimized over arrays etc.
match resTyNoNullable with
| ty when ty = typeof<double> -> me_double ([srcItemTy], [src;selector])
| ty when ty = typeof<single> -> me_single ([srcItemTy], [src;selector])
| ty when ty = typeof<decimal> -> me_decimal ([srcItemTy], [src;selector])
| ty when ty = typeof<int32> -> me_int32 ([srcItemTy], [src;selector])
| ty when ty = typeof<int64> -> me_int64 ([srcItemTy], [src;selector])
| _ ->
// The F# implementation needs a QuerySource as a parameter.
let qTy = typeof<IEnumerable>
let ctor = typedefof<QuerySource<_,_>>.MakeGenericType([|srcItemTy;qTy|]).GetConstructors().[0]
let src = Expr.NewObject(ctor, [src])
// The F# implementation needs an FSharpFunc as a parameter.
let selector = Expr.Lambda(v, res)
ME (qb, [srcItemTy;qTy;resTyNoNullable], [src;selector])
let Call (qb:obj,isIQ, srcItemTy:Type, resTyNoNullable:Type, src:obj, resTy:Type, v:Var, res:Expr) =
if isIQ then
let selector = FuncExprToLinqFunc2Expression (srcItemTy, resTy, v, res)
let caller =
match resTyNoNullable with
| ty when ty = typeof<double> -> cq_double
| ty when ty = typeof<single> -> cq_single
| ty when ty = typeof<decimal> -> cq_decimal
| ty when ty = typeof<int32> -> cq_int32
| ty when ty = typeof<int64> -> cq_int64
| _ -> failDueToUnsupportedInputTypeInSumByOrAverageBy()
caller ([srcItemTy], [src;box selector]) : obj
else
// Try to dynamically invoke a LINQ method if one exists, since these may be optimized over arrays etc.
let linqMethOpt =
match resTyNoNullable with
| ty when ty = typeof<double> -> Some ce_double
| ty when ty = typeof<single> -> Some ce_single
| ty when ty = typeof<decimal> -> Some ce_decimal
| ty when ty = typeof<int32> -> Some ce_int32
| ty when ty = typeof<int64> -> Some ce_int64
| _ -> None
match linqMethOpt with
| Some ce ->
// A LINQ method needs a Delegate as a parameter
let selector = FuncExprToLinqFunc2 (srcItemTy, resTy, v, res)
ce ([srcItemTy], [src;selector])
| None ->
// The F# implementation needs a QuerySource as a parameter.
let qTy = typeof<IEnumerable>
let ctor = typedefof<QuerySource<_,_>>.MakeGenericType([|srcItemTy;qTy|]).GetConstructors().[0]
let srcE =
try
ctor.Invoke [|src|]
with :? System.Reflection.TargetInvocationException as exn ->
raise exn.InnerException
// The F# implementation needs an FSharpFunc as a parameter.
let selectorE = Expr.Lambda (v, res) |> LeafExpressionConverter.EvaluateQuotation
CE (qb, [srcItemTy;qTy;resTy], [srcE;selectorE])
Make, Call
let MakeAverageBy, CallAverageBy =
let FQ_double = methodhandleof (fun (x,y:Expression<Func<_,double>>) -> System.Linq.Queryable.Average(x,y))
let FQ_single = methodhandleof (fun (x,y:Expression<Func<_,single>>) -> System.Linq.Queryable.Average(x,y))
let FQ_decimal = methodhandleof (fun (x,y:Expression<Func<_,decimal>>) -> System.Linq.Queryable.Average(x,y))
let FQ_int32 = methodhandleof (fun (x,y:Expression<Func<_,int32>>) -> System.Linq.Queryable.Average(x,y))
let FQ_int64 = methodhandleof (fun (x,y:Expression<Func<_,int64>>) -> System.Linq.Queryable.Average(x,y))
let FE_double = methodhandleof (fun (x,y:Func<_,double>) -> Enumerable.Average(x,y))
let FE_single = methodhandleof (fun (x,y:Func<_,single>) -> Enumerable.Average(x,y))
let FE_decimal = methodhandleof (fun (x,y:Func<_,decimal>) -> Enumerable.Average(x,y))
let FE_int32 = methodhandleof (fun (x,y:Func<_,int32>) -> Enumerable.Average(x,y))
let FE_int64 = methodhandleof (fun (x,y:Func<_,int64>) -> Enumerable.Average(x,y))
let FE = methodhandleof (fun (query:QueryBuilder,arg1:QuerySource<_,_>,arg2:_->double) -> query.AverageBy(arg1,arg2))
MakeOrCallAverageByOrSumByGeneric (false,FQ_double, FQ_single, FQ_decimal, FQ_int32, FQ_int64, FE_double, FE_single, FE_decimal, FE_int32, FE_int64, FE)
let MakeAverageByNullable, CallAverageByNullable =
let FQ_double = methodhandleof (fun (x,y:Expression<Func<_,Nullable<double>>>) -> System.Linq.Queryable.Average(x,y))
let FQ_single = methodhandleof (fun (x,y:Expression<Func<_,Nullable<single>>>) -> System.Linq.Queryable.Average(x,y))
let FQ_decimal = methodhandleof (fun (x,y:Expression<Func<_,Nullable<decimal>>>) -> System.Linq.Queryable.Average(x,y))
let FQ_int32 = methodhandleof (fun (x,y:Expression<Func<_,Nullable<int32>>>) -> System.Linq.Queryable.Average(x,y))
let FQ_int64 = methodhandleof (fun (x,y:Expression<Func<_,Nullable<int64>>>) -> System.Linq.Queryable.Average(x,y))
let FE_double = methodhandleof (fun (x,y:Func<_,Nullable<double>>) -> Enumerable.Average(x,y))
let FE_single = methodhandleof (fun (x,y:Func<_,Nullable<single>>) -> Enumerable.Average(x,y))
let FE_decimal = methodhandleof (fun (x,y:Func<_,Nullable<decimal>>) -> Enumerable.Average(x,y))
let FE_int32 = methodhandleof (fun (x,y:Func<_,Nullable<int32>>) -> Enumerable.Average(x,y))
let FE_int64 = methodhandleof (fun (x,y:Func<_,Nullable<int64>>) -> Enumerable.Average(x,y))
let FE = methodhandleof (fun (query:QueryBuilder, arg1:QuerySource<_,_>, arg2:_->Nullable<double>) -> query.AverageByNullable(arg1,arg2))
MakeOrCallAverageByOrSumByGeneric (true,FQ_double, FQ_single, FQ_decimal, FQ_int32, FQ_int64, FE_double, FE_single, FE_decimal, FE_int32, FE_int64, FE)
let MakeSumBy, CallSumBy =
let FQ_double = methodhandleof (fun (x,y:Expression<Func<_,double>>) -> System.Linq.Queryable.Sum(x,y))
let FQ_single = methodhandleof (fun (x,y:Expression<Func<_,single>>) -> System.Linq.Queryable.Sum(x,y))
let FQ_decimal = methodhandleof (fun (x,y:Expression<Func<_,decimal>>) -> System.Linq.Queryable.Sum(x,y))
let FQ_int32 = methodhandleof (fun (x,y:Expression<Func<_,int32>>) -> System.Linq.Queryable.Sum(x,y))
let FQ_int64 = methodhandleof (fun (x,y:Expression<Func<_,int64>>) -> System.Linq.Queryable.Sum(x,y))
let FE_double = methodhandleof (fun (x,y:Func<_,double>) -> Enumerable.Sum(x,y))
let FE_single = methodhandleof (fun (x,y:Func<_,single>) -> Enumerable.Sum(x,y))
let FE_decimal = methodhandleof (fun (x,y:Func<_,decimal>) -> Enumerable.Sum(x,y))
let FE_int32 = methodhandleof (fun (x,y:Func<_,int32>) -> Enumerable.Sum(x,y))
let FE_int64 = methodhandleof (fun (x,y:Func<_,int64>) -> Enumerable.Sum(x,y))
let FE = methodhandleof (fun (query:QueryBuilder, arg1:QuerySource<_,_>, arg2:_->double) -> query.SumBy(arg1,arg2))
MakeOrCallAverageByOrSumByGeneric (false,FQ_double, FQ_single, FQ_decimal, FQ_int32, FQ_int64, FE_double, FE_single, FE_decimal, FE_int32, FE_int64, FE)
let MakeSumByNullable, CallSumByNullable =
let FQ_double = methodhandleof (fun (x,y:Expression<Func<_,Nullable<double>>>) -> System.Linq.Queryable.Sum(x,y))
let FQ_single = methodhandleof (fun (x,y:Expression<Func<_,Nullable<single>>>) -> System.Linq.Queryable.Sum(x,y))
let FQ_decimal = methodhandleof (fun (x,y:Expression<Func<_,Nullable<decimal>>>) -> System.Linq.Queryable.Sum(x,y))
let FQ_int32 = methodhandleof (fun (x,y:Expression<Func<_,Nullable<int32>>>) -> System.Linq.Queryable.Sum(x,y))
let FQ_int64 = methodhandleof (fun (x,y:Expression<Func<_,Nullable<int64>>>) -> System.Linq.Queryable.Sum(x,y))
let FE_double = methodhandleof (fun (x,y:Func<_,Nullable<double>>) -> Enumerable.Sum(x,y))
let FE_single = methodhandleof (fun (x,y:Func<_,Nullable<single>>) -> Enumerable.Sum(x,y))
let FE_decimal = methodhandleof (fun (x,y:Func<_,Nullable<decimal>>) -> Enumerable.Sum(x,y))
let FE_int32 = methodhandleof (fun (x,y:Func<_,Nullable<int32>>) -> Enumerable.Sum(x,y))
let FE_int64 = methodhandleof (fun (x,y:Func<_,Nullable<int64>>) -> Enumerable.Sum(x,y))
let FE = methodhandleof (fun (query:QueryBuilder, arg1:QuerySource<_,_>, arg2:_->Nullable<double>) -> query.SumByNullable(arg1,arg2))
MakeOrCallAverageByOrSumByGeneric (true,FQ_double, FQ_single, FQ_decimal, FQ_int32, FQ_int64, FE_double, FE_single, FE_decimal, FE_int32, FE_int64, FE)
let MakeOrCallSimpleOp FQ FE =
let (CQ, MQ), (CE, ME) = MakersCallers2 FQ FE
let Make (isIQ, srcItemTy, src:Expr) =
if isIQ then
MQ ([srcItemTy], [src])
else
ME ([srcItemTy], [src])
let Call (isIQ, srcItemTy, src) =
(if isIQ then CQ else CE) ([srcItemTy], [src])
Make, Call
let MakeFirst, CallFirst = MakeOrCallSimpleOp (methodhandleof (fun x -> System.Linq.Queryable.First x)) (methodhandleof (fun x -> Enumerable.First x))
let MakeFirstOrDefault, CallFirstOrDefault = MakeOrCallSimpleOp (methodhandleof (fun x -> System.Linq.Queryable.FirstOrDefault x)) (methodhandleof (fun x -> Enumerable.FirstOrDefault x))
let MakeLast, CallLast = MakeOrCallSimpleOp (methodhandleof (fun x -> System.Linq.Queryable.Last x)) (methodhandleof (fun x -> Enumerable.Last x))
let MakeLastOrDefault, CallLastOrDefault = MakeOrCallSimpleOp (methodhandleof (fun x -> System.Linq.Queryable.LastOrDefault x)) (methodhandleof (fun x -> Enumerable.LastOrDefault x))
let MakeSingle, CallSingle = MakeOrCallSimpleOp (methodhandleof (fun x -> System.Linq.Queryable.Single x)) (methodhandleof (fun x -> Enumerable.Single x))
let MakeSingleOrDefault, CallSingleOrDefault = MakeOrCallSimpleOp (methodhandleof (fun x -> System.Linq.Queryable.SingleOrDefault x)) (methodhandleof (fun x -> Enumerable.SingleOrDefault x))
let MakeCount, CallCount = MakeOrCallSimpleOp (methodhandleof (fun x -> System.Linq.Queryable.Count x)) (methodhandleof (fun x -> Enumerable.Count x))
let MakeDefaultIfEmpty = MakeGenericStaticMethod (methodhandleof (fun x -> Enumerable.DefaultIfEmpty(x)))
/// Indicates if we can eliminate redundant 'Select(x=>x)' nodes
type CanEliminate =
/// Inside a query construct, can eliminate redundant 'Select'
| Yes = 0
/// At the very outer of a query or nested query - can't eliminate redundant 'Select'
| No = 1
let MakeSelect =
let FQ = MakeGenericStaticMethod (methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.Select(x,y)))
let FE = MakeGenericStaticMethod (methodhandleof (fun (x,y:Func<_,_>) -> Enumerable.Select(x,y)))
fun (canElim,isIQ, src:Expr, v:Var, f:Expr) ->
// Eliminate degenerate 'Select(x => x)', except for the very outer-most cases
match f with
| Patterns.Var(v2) when v = v2 && canElim = CanEliminate.Yes -> src
| _ ->
let srcItemTy = v.Type
let targetTy = f.Type
let selector = Expr.NewDelegate(MakeQueryFuncTy(srcItemTy, targetTy), [v], f)
if isIQ then
let selector = MakeImplicitExpressionConversion selector
FQ ([srcItemTy;targetTy], [src;selector])
else
//printfn "found FE"
FE ([srcItemTy;targetTy], [src;selector])
let MakeAppend =
let FQ = MakeGenericStaticMethod (methodhandleof (fun (x,y) -> System.Linq.Queryable.Concat(x,y)))
let FE = MakeGenericStaticMethod (methodhandleof (fun (x,y) -> Enumerable.Concat(x,y)))
fun (isIQ, srcItemTy, src1:Expr, src2:Expr) ->
if isIQ then
FQ ([srcItemTy], [src1;src2])
else
FE ([srcItemTy], [src1;src2])
let MakeAsQueryable =
let F = MakeGenericStaticMethod (methodhandleof (fun (x:seq<_>) -> System.Linq.Queryable.AsQueryable x))
fun (ty, src) ->
F ([ty], [src])
let MakeEnumerableEmpty =
let F = MakeGenericStaticMethod (methodhandleof (fun _x -> Enumerable.Empty()))
fun (ty) ->
F ([ty], [])
let MakeEmpty =
fun (ty) ->
MakeAsQueryable (ty, MakeEnumerableEmpty ty)
let MakeSelectMany =
let FQ = MakeGenericStaticMethod (methodhandleof (fun (x:IQueryable<_>,y:Expression<Func<_,_>>,z:Expression<Func<_,_,_>>) -> System.Linq.Queryable.SelectMany(x,y,z)))
let FE = MakeGenericStaticMethod (methodhandleof (fun (x:IEnumerable<_>,y:Func<_,_>,z:Func<_,_,_>) -> Enumerable.SelectMany(x,y,z)))
fun (isIQ, resTy:Type, src:Expr, srcItemVar:Var, interimSelectorBody:Expr, interimVar:Var, targetSelectorBody:Expr) ->
let srcItemTy = srcItemVar.Type
let interimTy = interimVar.Type
let interimSelector = Expr.NewDelegate(MakeQueryFuncTy(srcItemTy, MakeIEnumerableTy interimTy), [srcItemVar], interimSelectorBody)
let targetSelector = Expr.NewDelegate(MakeQueryFunc2Ty(srcItemTy, interimTy, resTy), [srcItemVar;interimVar], targetSelectorBody)
if isIQ then
let interimSelector = MakeImplicitExpressionConversion interimSelector
let targetSelector = MakeImplicitExpressionConversion targetSelector
FQ ([srcItemTy;interimTy;resTy], [src;interimSelector;targetSelector])
else
FE ([srcItemTy;interimTy;resTy], [src;interimSelector;targetSelector])
let MakeWhere =
let FQ = MakeGenericStaticMethod (methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.Where(x,y)))
let FE = MakeGenericStaticMethod (methodhandleof (fun (x,y:Func<_,_>) -> Enumerable.Where(x,y)))
fun (isIQ, src:Expr, v:Var, f) ->
let selector = Expr.NewDelegate(MakeQueryFuncTy(v.Type, typeof<bool>), [v], f)
if isIQ then
let selector = MakeImplicitExpressionConversion selector
FQ ([v.Type], [src;selector])
else
FE ([v.Type], [src;selector])
let MakeOrderByOrThenBy FQ FE =
fun (isIQ, src:Expr, v:Var, keySelector:Expr) ->
let srcItemTy = v.Type
let keyItemTy = keySelector.Type
let selector = Expr.NewDelegate(MakeQueryFuncTy(srcItemTy, keyItemTy), [v], keySelector)
if isIQ then
let selector = MakeImplicitExpressionConversion selector
FQ ([srcItemTy;keyItemTy], [src;selector])
else
FE ([srcItemTy;keyItemTy], [src;selector])
let MakeOrderBy =
let FQ = MakeGenericStaticMethod (methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.OrderBy(x,y)))
let FE = MakeGenericStaticMethod (methodhandleof (fun (x,y:Func<_,_>) -> Enumerable.OrderBy(x,y)))
MakeOrderByOrThenBy FQ FE
let MakeOrderByDescending =
let FQ = MakeGenericStaticMethod (methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.OrderByDescending(x,y)))
let FE = MakeGenericStaticMethod (methodhandleof (fun (x,y:Func<_,_>) -> Enumerable.OrderByDescending(x,y)))
MakeOrderByOrThenBy FQ FE
let MakeThenBy =
let FQ = MakeGenericStaticMethod (methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.ThenBy(x,y)))
let FE = MakeGenericStaticMethod (methodhandleof (fun (x,y:Func<_,_>) -> Enumerable.ThenBy(x,y)))
MakeOrderByOrThenBy FQ FE
let MakeThenByDescending =
let FQ = MakeGenericStaticMethod (methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.ThenByDescending(x,y)))
let FE = MakeGenericStaticMethod (methodhandleof (fun (x,y:Func<_,_>) -> Enumerable.ThenByDescending(x,y)))
MakeOrderByOrThenBy FQ FE
// The keyItemTy differentiates these
let MakeOrderByNullable = MakeOrderBy
let MakeOrderByNullableDescending = MakeOrderByDescending
let MakeThenByNullable = MakeThenBy
let MakeThenByNullableDescending = MakeThenByDescending
let GenMakeSkipWhileOrTakeWhile FQ FE =
let FQ = MakeGenericStaticMethod FQ
let FE = MakeGenericStaticMethod FE
fun (isIQ, src:Expr, v:Var, predicate) ->
let srcItemTy = v.Type
let selector = Expr.NewDelegate(MakeQueryFuncTy(srcItemTy, boolTy), [v], predicate)
if isIQ then
let selector = MakeImplicitExpressionConversion selector
FQ ([srcItemTy], [src;selector])
else
FE ([srcItemTy], [src;selector])
let MakeSkipOrTake FQ FE =
let FQ = MakeGenericStaticMethod FQ
let FE = MakeGenericStaticMethod FE
fun (isIQ, srcItemTy, src:Expr, count) ->
if isIQ then
FQ ([srcItemTy], [src;count])
else
FE ([srcItemTy], [src;count])
let MakeSkip =
MakeSkipOrTake (methodhandleof (fun (x,y) -> System.Linq.Queryable.Skip (x,y)))
(methodhandleof (fun (x,y) -> Enumerable.Skip (x,y)))
let MakeTake =
MakeSkipOrTake (methodhandleof (fun (x,y) -> System.Linq.Queryable.Take (x,y)))
(methodhandleof (fun (x,y) -> Enumerable.Take (x,y)))
let MakeSkipWhile =
GenMakeSkipWhileOrTakeWhile (methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.SkipWhile(x,y)))
(methodhandleof (fun (x,y:Func<_,_>) -> Enumerable.SkipWhile(x,y)))
let MakeTakeWhile =
GenMakeSkipWhileOrTakeWhile (methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.TakeWhile(x,y)))
(methodhandleof (fun (x,y:Func<_,_>) -> Enumerable.TakeWhile(x,y)))
let MakeDistinct =
let FQ = MakeGenericStaticMethod (methodhandleof (fun x -> System.Linq.Queryable.Distinct x))
let FE = MakeGenericStaticMethod (methodhandleof (fun x -> Enumerable.Distinct x))
fun (isIQ, srcItemTy, src:Expr) ->
if isIQ then
FQ ([srcItemTy], [src])
else
FE ([srcItemTy], [src])
let MakeGroupBy =
let FQ = MakeGenericStaticMethod (methodhandleof (fun (x,y:Expression<Func<_,_>>) -> System.Linq.Queryable.GroupBy(x,y)))
let FE = MakeGenericStaticMethod (methodhandleof (fun (x,y:Func<_,_>) -> Enumerable.GroupBy(x,y)))
fun (isIQ, src:Expr, v:Var, keySelector:Expr) ->
let srcItemTy = v.Type
let keyTy = keySelector.Type
let keySelector = Expr.NewDelegate(MakeQueryFuncTy(srcItemTy, keyTy), [v], keySelector)
if isIQ then
let keySelector = MakeImplicitExpressionConversion keySelector
FQ ([srcItemTy;keyTy], [src;keySelector])
else
FE ([srcItemTy;keyTy], [src;keySelector])
let MakeGroupValBy =
let FQ = MakeGenericStaticMethod (methodhandleof (fun (x,y:Expression<Func<_,_>>, z:Expression<Func<_,_>>) -> System.Linq.Queryable.GroupBy(x,y,z)))
let FE = MakeGenericStaticMethod (methodhandleof (fun (x,y:Func<_,_>, z:Func<_,_>) -> Enumerable.GroupBy(x,y,z)))
fun (isIQ, srcItemTy, keyTy, elementTy, src:Expr, v1, keySelector, v2, elementSelector) ->
let keySelector = Expr.NewDelegate(MakeQueryFuncTy(srcItemTy, keyTy), [v1], keySelector)
let elementSelector = Expr.NewDelegate(MakeQueryFuncTy(srcItemTy, elementTy), [v2], elementSelector)
if isIQ then
let keySelector = MakeImplicitExpressionConversion keySelector
let elementSelector = MakeImplicitExpressionConversion elementSelector
FQ ([srcItemTy;keyTy;elementTy], [src;keySelector;elementSelector])
else
FE ([srcItemTy;keyTy;elementTy], [src;keySelector;elementSelector])
#if SUPPORT_ZIP_IN_QUERIES
let MakeZip =
let FQ = MakeGenericStaticMethod (methodhandleof (fun (x,y, z:Expression<Func<_,_,_>>) -> System.Linq.Queryable.Zip(x,y,z)))
let FE = MakeGenericStaticMethod (methodhandleof (fun (x,y, z:Func<_,_,_>) -> Enumerable.Zip(x,y,z)))
fun (firstSourceTy, secondSourceTy, resTy, firstSource:Expr, secondSource:Expr, firstElementVar, secondElementVar, elementSelector) ->
let elementSelector = Expr.NewDelegate(MakeQueryFunc2Ty(firstSourceTy, secondSourceTy, resTy), [firstElementVar;secondElementVar], elementSelector)
if typeof<IQueryable>.IsAssignableFrom(firstSource.Type) && typeof<IQueryable>.IsAssignableFrom(secondSource.Type) then
let elementSelector = MakeImplicitExpressionConversion elementSelector
FQ ([firstSourceTy;secondSourceTy;resTy], [firstSource;secondSource;elementSelector])
else
FE ([firstSourceTy;secondSourceTy;resTy], [firstSource;secondSource;elementSelector])
#endif
let MakeJoin =
let FQ = MakeGenericStaticMethod (methodhandleof (fun (a1,a2,a3:Expression<Func<_,_>>,a4:Expression<Func<_,_>>,a5:Expression<Func<_,_,_>>) -> System.Linq.Queryable.Join(a1,a2,a3,a4,a5)))
let FE = MakeGenericStaticMethod (methodhandleof (fun (a1,a2,a3:Func<_,_>,a4:Func<_,_>,a5:Func<_,_,_>) -> Enumerable.Join(a1,a2,a3,a4,a5)))
fun (isIQ, outerSourceTy, innerSourceTy, keyTy, resTy, outerSource:Expr, innerSource:Expr, outerKeyVar, outerKeySelector, innerKeyVar, innerKeySelector, outerResultKeyVar, innerResultKeyVar, elementSelector) ->
let outerKeySelector = Expr.NewDelegate(MakeQueryFuncTy(outerSourceTy, keyTy), [outerKeyVar], outerKeySelector)
let innerKeySelector = Expr.NewDelegate(MakeQueryFuncTy(innerSourceTy, keyTy), [innerKeyVar], innerKeySelector)
let elementSelector = Expr.NewDelegate(MakeQueryFunc2Ty(outerSourceTy, innerSourceTy, resTy), [outerResultKeyVar;innerResultKeyVar], elementSelector)
if isIQ then
let outerKeySelector = MakeImplicitExpressionConversion outerKeySelector
let innerKeySelector = MakeImplicitExpressionConversion innerKeySelector
let elementSelector = MakeImplicitExpressionConversion elementSelector
FQ ([outerSourceTy;innerSourceTy;keyTy;resTy], [outerSource;innerSource;outerKeySelector;innerKeySelector;elementSelector])
else
FE ([outerSourceTy;innerSourceTy;keyTy;resTy], [outerSource;innerSource;outerKeySelector;innerKeySelector;elementSelector])
let MakeGroupJoin =
let FQ = MakeGenericStaticMethod (methodhandleof (fun (a1,a2,a3:Expression<Func<_,_>>,a4:Expression<Func<_,_>>,a5:Expression<Func<_,_,_>>) -> System.Linq.Queryable.GroupJoin(a1,a2,a3,a4,a5)))
let FE = MakeGenericStaticMethod (methodhandleof (fun (a1,a2,a3:Func<_,_>,a4:Func<_,_>,a5:Func<_,_,_>) -> Enumerable.GroupJoin(a1,a2,a3,a4,a5)))
fun (isIQ, outerSourceTy, innerSourceTy, keyTy, resTy, outerSource:Expr, innerSource:Expr, outerKeyVar, outerKeySelector, innerKeyVar, innerKeySelector, outerResultKeyVar, innerResultGroupVar, elementSelector) ->
let outerKeySelector = Expr.NewDelegate(MakeQueryFuncTy(outerSourceTy, keyTy), [outerKeyVar], outerKeySelector)
let innerKeySelector = Expr.NewDelegate(MakeQueryFuncTy(innerSourceTy, keyTy), [innerKeyVar], innerKeySelector)
let elementSelector = Expr.NewDelegate(MakeQueryFunc2Ty(outerSourceTy, MakeIEnumerableTy(innerSourceTy), resTy), [outerResultKeyVar;innerResultGroupVar], elementSelector)
if isIQ then
let outerKeySelector = MakeImplicitExpressionConversion outerKeySelector
let innerKeySelector = MakeImplicitExpressionConversion innerKeySelector
let elementSelector = MakeImplicitExpressionConversion elementSelector
FQ ([outerSourceTy;innerSourceTy;keyTy;resTy], [outerSource;innerSource;outerKeySelector;innerKeySelector;elementSelector])
else
FE ([outerSourceTy;innerSourceTy;keyTy;resTy], [outerSource;innerSource;outerKeySelector;innerKeySelector;elementSelector])
let RewriteExpr f (q : Expr) =
let rec walk (p : Expr) =
match f walk p with
| Some r -> r
| None ->
match p with
| ExprShape.ShapeCombination(comb, args) -> ExprShape.RebuildShapeCombination(comb, List.map walk args)
| ExprShape.ShapeLambda(v, body) -> Expr.Lambda(v, walk body)
| ExprShape.ShapeVar _ -> p
walk q
let (|LetExprReduction|_|) (p : Expr) =
match p with
| Let(v, e, body) ->
let body = body.Substitute (fun v2 -> if v = v2 then Some e else None)
Some body
| _ -> None
let (|MacroReduction|_|) (p : Expr) =
match p with
| Applications(Lambdas(vs, body), args) when vs.Length = args.Length && List.forall2 (fun vs args -> List.length vs = List.length args) vs args ->
let tab = Map.ofSeq (List.concat (List.map2 List.zip vs args))
let body = body.Substitute tab.TryFind
Some body
// Macro
| PropertyGet(None, Getter(MethodWithReflectedDefinition(body)), []) ->
Some body
// Macro
| Call(None, MethodWithReflectedDefinition(Lambdas(vs, body)), args) ->
let tab = Map.ofSeq (List.concat (List.map2 (fun (vs:Var list) arg -> match vs, arg with [v], arg -> [(v, arg)] | vs, NewTuple(args) -> List.zip vs args | _ -> List.zip vs [arg]) vs args))
let body = body.Substitute tab.TryFind
Some body
// Macro - eliminate 'let'.
//
// Always eliminate these:
// - function definitions
//
// Always eliminate these, which are representations introduced by F# quotations:
// - let v1 = v2
// - let v1 = tupledArg.Item*
// - let copyOfStruct = ...
| Let(v, e, body) when (match e with
| Lambda _ -> true
| Var _ -> true
| TupleGet(Var tv, _) when tv.Name = "tupledArg" -> true
| _ when v.Name = "copyOfStruct" && v.Type.IsValueType -> true
| _ -> false) ->
let body = body.Substitute (fun v2 -> if v = v2 then Some e else None)
Some body
| _ -> None
/// Expand 'let' and other 'macro' definitions in leaf expressions, because LINQ can't cope with them
let MacroExpand q =
q |> RewriteExpr (fun walk p ->
match p with
// Macro reduction - eliminate any 'let' in leaf expressions
| MacroReduction reduced -> Some (walk reduced)
| _ -> None)
let (|CallQueryBuilderRunQueryable|_|) : Quotations.Expr -> _ = (|SpecificCallToMethod|_|) (methodhandleof (fun (b :QueryBuilder, v) -> b.Run(v)))
let (|CallQueryBuilderRunValue|_|) : Quotations.Expr -> _ = (|SpecificCallToMethod|_|) (methodhandleof (fun (b : QueryBuilder, v : Expr<'a>) -> b.Run(v)) : 'a) // type annotations here help overload resolution
let (|CallQueryBuilderRunEnumerable|_|) : Quotations.Expr -> _ = (|SpecificCallToMethod|_|) (methodhandleof (fun (b : QueryBuilder, v : Expr<QuerySource<_, IEnumerable>> ) -> b.Run(v))) // type annotations here help overload resolution
let (|CallQueryBuilderFor|_|) : Quotations.Expr -> _ = (|SpecificCallToMethod|_|) (methodhandleof (fun (b:QueryBuilder,source:QuerySource<int,_>,body) -> b.For(source,body)))
let (|CallQueryBuilderYield|_|) : Quotations.Expr -> _ = (|SpecificCall1|_|) (methodhandleof (fun (b:QueryBuilder,value) -> b.Yield value))
let (|CallQueryBuilderYieldFrom|_|) : Quotations.Expr -> _ = (|SpecificCallToMethod|_|) (methodhandleof (fun (b:QueryBuilder,values) -> b.YieldFrom values))
let (|CallQueryBuilderZero|_|) : Quotations.Expr -> _ = (|SpecificCallToMethod|_|) (methodhandleof (fun (b:QueryBuilder) -> b.Zero()))
let (|CallQueryBuilderSourceIQueryable|_|) : Quotations.Expr -> _ = (|SpecificCall1|_|) (methodhandleof (fun (b:QueryBuilder,value:IQueryable<_>) -> b.Source value))
let (|CallQueryBuilderSourceIEnumerable|_|) : Quotations.Expr -> _ = (|SpecificCall1|_|) (methodhandleof (fun (b:QueryBuilder,value:IEnumerable<_>) -> b.Source value))
let (|CallSortBy|_|) = (|SpecificCall2|_|) (methodhandleof (fun (query:QueryBuilder,arg1,arg2) -> query.SortBy(arg1,arg2)))