some minor performance optimisations

src/FSharpAux.Core/Colors.fs

@@ -19,6 +19,7 @@ module Colors =
         | B v -> v
 
     /// Color structure
+    [<Struct>]
     type Color = {
         /// The alpha component value of this Color structure.
         A : byte

src/FSharpAux.Core/Dict.fs

@@ -54,7 +54,9 @@ module Dict =
                 member s.ContainsKey(k) = d.ContainsKey(Some(k))
                 member s.TryGetValue(k,r) = 
                     let key = Some(k)
-                    if d.ContainsKey(key) then (r <- d.[key]; true) else false
+                    match d.TryGetValue key with 
+                    | true, v -> r <- v; true
+                    | false, _ -> false
                 member s.Remove(k : 'Key) = (raise (NotSupportedException(notMutable)) : bool) 
 
           interface ICollection<KeyValuePair<'Key, 'T>> with 

src/FSharpAux.Core/Regex.fs

@@ -9,10 +9,11 @@ module Regex =
     //http://stackoverflow.com/questions/5684014/f-mapping-regular-expression-matches-with-active-patterns
     module Active = 
         /// Returns the first occurencing match of the pattern 
+        [<return: Struct>]
         let (|RegexMatchValue|_|) (regex:Regex) input =
             let m = regex.Match(input)    
-            if m.Success then Some m.Value
-            else None
+            if m.Success then ValueSome m.Value
+            else ValueNone
 
 
 
@@ -68,12 +69,13 @@ module Regex =
     /// Returns a seq of group values matching the pattern 
     let parseAll regexStr line = 
         let rec loop (m:Match) =
-            seq {
             match m.Success with
             | true -> 
-                yield (List.tail [ for g in m.Groups -> g.Value ])
-                yield! loop (m.NextMatch())
-            | false -> () }
+                seq {
+                    yield (List.tail [ for g in m.Groups -> g.Value ])
+                    yield! loop (m.NextMatch()) 
+                }
+            | false -> Seq.empty
         let m = Regex.Match(line,regexStr)
         loop m
 

src/FSharpAux.Core/Seq.fs

@@ -174,9 +174,10 @@ module Seq =
         keyList 
         |> Seq.map (
             fun k -> 
-                if m.ContainsKey(k) then
-                    aggregation m.[k]
-                else
+                match m.TryGetValue k with
+                | true, mk ->
+                    aggregation mk
+                | false, _ ->
                     defaultValue 
         )
 

src/FSharpAux.Core/String.fs

@@ -79,46 +79,53 @@ module String =
 
 
     // Active patterns & operators for parsing strings
-    let (@?) (s:string) i = if i >= s.Length then None else Some s.[i]
+    let (@?) (s:string) i = if i >= s.Length then ValueNone else ValueSome s.[i]
 
-    let inline satisfies predicate (charOption:option<char>) = 
+    let inline satisfies predicate (charOption:voption<char>) = 
         match charOption with 
-        | Some c when predicate c -> charOption 
-        | _ -> None
+        | ValueSome c when predicate c -> charOption 
+        | _ -> ValueNone
 
+    [<return: Struct>]
     let (|EOF|_|) = function 
-        | Some _ -> None
-        | _ -> Some ()
+        | ValueSome _ -> ValueNone
+        | _ -> ValueSome ()
 
+    [<return: Struct>]
     let (|LetterDigit|_|) = satisfies Char.IsLetterOrDigit
+    [<return: Struct>]
     let (|Upper|_|) = satisfies Char.IsUpper
+    [<return: Struct>]
     let (|Lower|_|) = satisfies Char.IsLower
 
     /// Turns a string into a nice PascalCase identifier
     let niceName (s:string) = 
         if s = s.ToUpper() then s else
         // Starting to parse a new segment 
-        let rec restart i = seq {
+        let rec restart i = 
           match s @? i with 
-          | EOF -> ()
-          | LetterDigit _ & Upper _ -> yield! upperStart i (i + 1)
-          | LetterDigit _ -> yield! consume i false (i + 1)
-          | _ -> yield! restart (i + 1) }
+          | EOF -> Seq.empty
+          | LetterDigit _ & Upper _ -> upperStart i (i + 1)
+          | LetterDigit _ -> consume i false (i + 1)
+          | _ -> restart (i + 1) 
 
         // Parsed first upper case letter, continue either all lower or all upper
-        and upperStart from i = seq {
+        and upperStart from i = 
           match s @? i with 
-          | Upper _ -> yield! consume from true (i + 1) 
-          | Lower _ -> yield! consume from false (i + 1) 
-          | _ -> yield! restart (i + 1) }
+          | Upper _ -> consume from true (i + 1) 
+          | Lower _ -> consume from false (i + 1) 
+          | _ -> restart (i + 1)
         // Consume are letters of the same kind (either all lower or all upper)
-        and consume from takeUpper i = seq {
+        and consume from takeUpper i = 
           match s @? i with
-          | Lower _ when not takeUpper -> yield! consume from takeUpper (i + 1)
-          | Upper _ when takeUpper -> yield! consume from takeUpper (i + 1)
+          | Lower _ when not takeUpper -> consume from takeUpper (i + 1)
+          | Upper _ when takeUpper -> consume from takeUpper (i + 1)
           | _ -> 
-              yield from, i
-              yield! restart i }
+              let r1 = struct (from, i)
+              let r2 = restart i
+              seq {
+                  yield r1
+                  yield! r2 }
 
         // Split string into segments and turn them to PascalCase
         seq { for i1, i2 in restart 0 do 

src/FSharpAux.IO/FileIO.fs

@@ -96,8 +96,8 @@ module FileIO =
     /// Detects whether the given path does not contains invalid characters.
     let isValidPath (path:string) =
         Path.GetInvalidPathChars()
-        |> Array.filter (fun char -> path.Contains(char.ToString()))
-        |> Array.isEmpty
+        |> Array.exists (fun char -> path.Contains(char.ToString()))
+        |> not
 
 
     /// Creates a directory if it does not exist.
@@ -140,7 +140,7 @@ module FileIO =
     let FileEnumerator (filePath) =
         use reader = File.OpenText(filePath)
         Seq.unfold(fun line ->
-            if line = null then
+            if isNull line then
                 reader.Close()
                 None
             else
@@ -206,11 +206,11 @@ module FileIO =
 
 
     /// Appends a text if the value is not null
-    let inline appendIfNotNull value s = appendIfTrue (value <> null) (sprintf "%s%A" s value)
+    let inline appendIfNotNull value s = appendIfTrue (not (isNull value)) (sprintf "%s%A" s value)
 
 
     /// Appends a text if the value is not null
-    let inline appendStringIfValueIsNotNull value = appendIfTrue (value <> null)
+    let inline appendStringIfValueIsNotNull value = appendIfTrue (not (isNull value))
 
 
     /// Appends a text if the value is not null or empty

src/FSharpAux.IO/PathFileName.fs

@@ -14,9 +14,10 @@ module PathFileName =
         | _ -> failwith "No file or directory given."
 
     /// Active Pattern for determining file extension.
+    [<return: Struct>]
     let (|EndsWith|_|) (extension : string) (file : string) = 
-        if file.EndsWith extension then Some()
-        else None
+        if file.EndsWith extension then ValueSome()
+        else ValueNone
 
     /// Active Pattern for determining file name.
     let (|FileInfoFullName|) (f : FileInfo) = f.FullName

src/FSharpAux.IO/SchemaReader.fs

@@ -259,7 +259,7 @@ module SchemaReader =
                 let header    = convertHeaderLine separator header
 
                 Seq.unfold(fun line -> 
-                    if line = null then 
+                    if isNull line then 
                         reader.Close() 
                         None 
                     else 
@@ -276,7 +276,7 @@ module SchemaReader =
                     | true  ->
                         for i = 1 to skipLinesBeforeHeader do reader.ReadLine() |> ignore
                         let tmpLine = reader.ReadLine()
-                        if tmpLine = null then 
+                        if isNull tmpLine then 
                             reader.Close()
                             String.Empty
                         else

src/FSharpAux/PSeq.fs

@@ -130,7 +130,7 @@ module PSeq =
         ParallelEnumerable.ElementAt(toP(s), n)
 
     let map2 f s1 s2 = 
-        ParallelEnumerable.Zip(toP(s1),toP(s2), Func<_,_,_>(fun x y -> f x y))
+        ParallelEnumerable.Zip(toP(s1),toP(s2), Func<_,_,_>(f))
 
     let zip s1 s2 = 
         ParallelEnumerable.Zip(toP(s1),toP(s2), Func<_,_,_>(fun x y -> (x,y)))
@@ -167,7 +167,7 @@ module PSeq =
         ParallelEnumerable.Select(distinct, Func<_,_>(fun (x,px) -> x))
 
     let sort s  = 
-        ParallelEnumerable.OrderBy(toP(s), Func<_,_>(fun x -> x), ComparisonIdentity.Structural<_>) :> pseq<'T>
+        ParallelEnumerable.OrderBy(toP(s), Func<_,_>(id), ComparisonIdentity.Structural<_>) :> pseq<'T>
 
     let sortBy (f : 'T -> 'Key) s = 
         ParallelEnumerable.OrderBy(toP(s), Func<_,_>(f), ComparisonIdentity.Structural<_>) :> pseq<'T>
@@ -235,7 +235,7 @@ module PSeq =
         | :? seq<float> as s -> unbox(ParallelEnumerable.Min(toP(s)))
         | :? seq<float32> as s -> unbox(ParallelEnumerable.Min(toP(s)))
         | :? seq<decimal> as s -> unbox(ParallelEnumerable.Min(toP(s)))
-        | _ ->  ParallelEnumerable.Min(toP(s), Func<_,_>(fun x -> x))
+        | _ ->  ParallelEnumerable.Min(toP(s), Func<_,_>(id))
 
     let inline minBy (f : ^T -> ^U) (s : seq< ^T >) : ^T when ^U : comparison = 
         let elemsAndVals = ParallelEnumerable.Select(toP(s), Func<_,_>(fun x -> f x, x))
@@ -250,7 +250,7 @@ module PSeq =
         | :? seq<float> as s -> unbox(ParallelEnumerable.Max(toP(s)))
         | :? seq<float32> as s -> unbox(ParallelEnumerable.Max(toP(s)))
         | :? seq<decimal> as s -> unbox(ParallelEnumerable.Max(toP(s)))
-        | _ ->  ParallelEnumerable.Max(toP(s), Func<_,_>(fun x -> x))
+        | _ ->  ParallelEnumerable.Max(toP(s), Func<_,_>(id))
 
     let inline maxBy (f : ^T -> ^U) (s : seq< ^T >) : ^T = 
         let elemsAndVals = ParallelEnumerable.Select(toP(s), Func<_,_>(fun x -> f x, x))