Frank A. Krueger praeclarum
praeclarum
/ AlgorithmW.fs
Last active
February 2, 2025 14:29
Algorithm W - or Hindley-Milner polymorphic type inference - in F#
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| module AlgorithmW | |
| // HINDLEY-MILNER TYPE INFERENCE | |
| // Based on http://catamorph.de/documents/AlgorithmW.pdf | |
| // (Now at http://web.archive.org/web/20170704013532/http://catamorph.de/documents/AlgorithmW.pdf) | |
| type Lit = | |
| | LInt of int | |
| | LBool of bool |
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| module k | |
| (* | |
| type TypeIdent = string | |
| type TypeExpr = name:string? (string | TypeIdent | Or TypeExpr TypeExpr | And TypeExpr) | |
| type TypeDecl = Type string TypeExpr |
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| using System; | |
| using MonoTouch.CoreGraphics; | |
| using MonoTouch.Foundation; | |
| using MonoTouch.CoreAnimation; | |
| using System.Drawing; | |
| namespace Presentation.AnimationPresentation | |
| { | |
| class PieChartLayer : CALayer | |
| { |
praeclarum
/ Seq.swift
Last active
August 29, 2015 14:24
Some function and SequenceType extensions that I found missing in Swift 2
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| // | |
| // Seq.swift | |
| // | |
| // Created by Frank A. Krueger on 7/8/15. | |
| // Copyright © 2015 Krueger Systems, Inc. All rights reserved. | |
| // MIT Licensed | |
| // | |
| import Foundation |
praeclarum
/ Script.swift
Last active
November 26, 2020 22:31
A little scripting language written in Swift. It supports first class functions (closures) and variable mutation. This code includes the AST, the interpreter, and a JavaScript parser.
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| // | |
| // Script.swift | |
| // | |
| // Created by Frank A. Krueger on 6/28/15. | |
| // Copyright © 2015 Krueger Systems, Inc. All rights reserved. | |
| // | |
| import Foundation | |
| enum Val { |
praeclarum
/ ArrayDiff.swift
Last active
January 8, 2021 06:10
A generic diffing operation that can calculate the minimal steps needed to convert one array to another. It can be used to generate standard diffs, or it can be used more creatively to calculate minimal UI updates.
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| // | |
| // ArrayDiff.swift | |
| // | |
| // Created by Frank A. Krueger on 6/30/15. | |
| // Copyright © 2015 Krueger Systems, Inc. All rights reserved. | |
| // License: MIT http://opensource.org/licenses/MIT | |
| // | |
| import Foundation |
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| 2015-06-08 19:30:34.539 Mocast[717:131208] DATA /var/mobile/Containers/Data/Application/D2784AE1-D4E4-4555-9CB7-D576E6470AD4/Documents/Mocast.sqlite | |
| 2015-06-08 19:30:34.562 Mocast[717:131208] ERROR: System.DllNotFoundException: sqlite3 | |
| at (wrapper managed-to-native) SQLite.SQLite3:Open (byte[],intptr&,int,intptr) | |
| at SQLite.SQLiteConnection..ctor (System.String databasePath, SQLiteOpenFlags openFlags, Boolean storeDateTimeAsTicks) [0x00066] in /Users/fak/Dropbox/Projects/sqlite-net/src/SQLite.cs:219 | |
| at SQLite.SQLiteConnection..ctor (System.String databasePath, Boolean storeDateTimeAsTicks) [0x00000] in /Users/fak/Dropbox/Projects/sqlite-net/src/SQLite.cs:181 | |
| at Mocast.MocastStorage..ctor () [0x00089] in /Users/fak/Dropbox/Projects/Mocast/Mocast/Mocast/MocastStorage.cs:49 | |
| at Mocast.AppDelegate.FinishedLaunching (UIKit.UIApplication app, Foundation.NSDictionary options) [0x0002a] in /Users/fak/Dropbox/Projects/Mocast/Mocast/AppDelegate.cs:58 | |
| ERROR: System.DllNotFoundException: sqlite3 | |
| at (wrapper |
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| Mocast[650] <Notice>: WARNING: The runtime version supported by this application is unavailable.\^J | |
| Mocast[650] <Notice>: Using default runtime: v4.0.30319\^J | |
| Mocast[650] <Notice>: * Assertion at ../../../../../mono/mono/mini/aot-runtime.c:4607, condition `amodule->info.tramp_page_size == psize' not met\^J | |
| Mocast[650] <Notice>: \^JNative stacktrace:\^J\^J | |
| Mocast[650] <Notice>: 0 Mocast 0x022f41c7 mono_handle_native_sigsegv + 238\^J | |
| Mocast[650] <Notice>: 1 Mocast 0x022f8095 sigabrt_signal_handler + 104\^J | |
| Mocast[650] <Notice>: 2 libsystem_platform.dylib 0x37fce88b _sigtramp + 42\^J | |
| Mocast[650] <Notice>: 3 libsystem_pthread.dylib 0x37fd394f pthread_kill + 62\^J | |
| Mocast[650] <Notice>: 4 libsystem_c.dylib 0x37ed5fe9 abort + 108\^J | |
| Mocast[650] <Notice>: 5 Mocast 0x0239bd4d monoeg_log_default_handler + 112\^J |
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| module Parser = | |
| type Position = | |
| { | |
| Code : string | |
| Index : int | |
| } | |
| let ws p = | |
| if p.Index >= p.Code.Length then p |
praeclarum
/ PinnedArray2.fs
Created
March 4, 2015 15:15
PinnedArray2 for passing 2D arrays to native code
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| type PinnedArray2 (array : float[,]) = | |
| let h = GCHandle.Alloc (array, GCHandleType.Pinned) | |
| let ptr = Marshal.UnsafeAddrOfPinnedArrayElement(array, 0) | |
| member this.Ptr = NativePtr.ofNativeInt<float>(ptr) | |
| interface IDisposable with | |
| member this.Dispose () = h.Free () |