commit 647b4cc0b14a7b5b69dad2df0cef42f54007ab68
Author: Starbeamrainbowlabs <sbrl@starbeamrainbowlabs.com>
Date:   Wed Apr 26 21:35:00 2017 +0100

    Initial commit. I think this si worth keeping in it's entirety!

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..08185c2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,434 @@
+
+# Created by https://www.gitignore.io/api/visualstudio,monodevelop,csharp
+
+### Csharp ###
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+# Since there are multiple workflows, uncomment next line to ignore bower_components
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+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
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+Backup*/
+UpgradeLog*.XML
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+# SQL Server files
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+# Node.js Tools for Visual Studio
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+test-results/
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+### VisualStudio ###
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+##
+## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
+
+# User-specific files
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+
+# Build results
+
+# Visual Studio 2015 cache/options directory
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# MSTest test Results
+
+# NUNIT
+
+# Build Results of an ATL Project
+
+# .NET Core
+
+
+# Chutzpah Test files
+
+# Visual C++ cache files
+
+# Visual Studio profiler
+
+# TFS 2012 Local Workspace
+
+# Guidance Automation Toolkit
+
+# ReSharper is a .NET coding add-in
+
+# JustCode is a .NET coding add-in
+
+# TeamCity is a build add-in
+
+# DotCover is a Code Coverage Tool
+
+# Visual Studio code coverage results
+
+# NCrunch
+
+# MightyMoose
+
+# Web workbench (sass)
+
+# Installshield output folder
+
+# DocProject is a documentation generator add-in
+
+# Click-Once directory
+
+# Publish Web Output
+# TODO: Comment the next line if you want to checkin your web deploy settings
+# but database connection strings (with potential passwords) will be unencrypted
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+
+# NuGet Packages
+# The packages folder can be ignored because of Package Restore
+# except build/, which is used as an MSBuild target.
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/packages/repositories.config
+# NuGet v3's project.json files produces more ignorable files
+
+# Microsoft Azure Build Output
+
+# Microsoft Azure Emulator
+
+# Windows Store app package directories and files
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+# but keep track of directories ending in .cache
+
+# Others
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+
+# SQL Server files
+
+# Business Intelligence projects
+
+# Microsoft Fakes
+
+# GhostDoc plugin setting file
+
+# Node.js Tools for Visual Studio
+
+# Typescript v1 declaration files
+
+# Visual Studio 6 build log
+
+# Visual Studio 6 workspace options file
+
+# Visual Studio 6 auto-generated workspace file (contains which files were open etc.)
+
+# Visual Studio LightSwitch build output
+
+# Paket dependency manager
+
+# FAKE - F# Make
+
+# JetBrains Rider
+
+# CodeRush
+
+# Python Tools for Visual Studio (PTVS)
+
+# Cake - Uncomment if you are using it
+# tools/**
+# !tools/packages.config
+
+# Telerik's JustMock configuration file
+
+# BizTalk build output
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+# End of https://www.gitignore.io/api/visualstudio,monodevelop,csharp
diff --git a/MarkovGrams.sln b/MarkovGrams.sln
new file mode 100644
index 0000000..7d617a4
--- /dev/null
+++ b/MarkovGrams.sln
@@ -0,0 +1,17 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2012
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MarkovGrams", "MarkovGrams\MarkovGrams.csproj", "{14743F58-9418-4147-9C2C-0626AD7185D3}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x86 = Debug|x86
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{14743F58-9418-4147-9C2C-0626AD7185D3}.Debug|x86.ActiveCfg = Debug|x86
+		{14743F58-9418-4147-9C2C-0626AD7185D3}.Debug|x86.Build.0 = Debug|x86
+		{14743F58-9418-4147-9C2C-0626AD7185D3}.Release|x86.ActiveCfg = Release|x86
+		{14743F58-9418-4147-9C2C-0626AD7185D3}.Release|x86.Build.0 = Release|x86
+	EndGlobalSection
+EndGlobal
diff --git a/MarkovGrams/MarkovGrams.csproj b/MarkovGrams/MarkovGrams.csproj
new file mode 100644
index 0000000..bf5c49c
--- /dev/null
+++ b/MarkovGrams/MarkovGrams.csproj
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+    <ProjectGuid>{14743F58-9418-4147-9C2C-0626AD7185D3}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>MarkovGrams</RootNamespace>
+    <AssemblyName>MarkovGrams</AssemblyName>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug</OutputPath>
+    <DefineConstants>DEBUG;</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <ExternalConsole>true</ExternalConsole>
+    <PlatformTarget>x86</PlatformTarget>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <ExternalConsole>true</ExternalConsole>
+    <PlatformTarget>x86</PlatformTarget>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="NGrams.cs" />
+    <Compile Include="UnweightedMarkovChain.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
+</Project>
\ No newline at end of file
diff --git a/MarkovGrams/NGrams.cs b/MarkovGrams/NGrams.cs
new file mode 100644
index 0000000..5137b6b
--- /dev/null
+++ b/MarkovGrams/NGrams.cs
@@ -0,0 +1,85 @@
+﻿using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace MarkovGrams
+{
+	/// <summary>
+	/// A collection of methods to generate various different types of n-grams.
+	/// </summary>
+	public static class NGrams
+	{
+		/// <summary>
+		/// Generates a unique list of n-grams that the given list of words.
+		/// </summary>
+		/// <param name="words">The words to turn into n-grams.</param>
+		/// <param name="order">The order of n-gram to generate..</param>
+		/// <returns>A unique list of n-grams found in the given list of words.</returns>
+		public static IEnumerable<string> GenerateFlat(IEnumerable<string> words, int order)
+		{
+			List<string> results = new List<string>();
+			foreach(string word in words)
+			{
+				results.AddRange(GenerateFlat(word, order));
+			}
+			return results.Distinct();
+		}
+
+		/// <summary>
+		/// Generates a unique list of n-grams from the given string.
+		/// </summary>
+		/// <param name="str">The string to n-gram-ise.</param>
+		/// <param name="order">The order of n-gram to generate.</param>
+		/// <returns>A unique list of n-grams found in the specified string.</returns>
+		public static IEnumerable<string> GenerateFlat(string str, int order)
+		{
+			List<string> results = new List<string>();
+			for(int i = 0; i < str.Length - order; i++)
+			{
+				results.Add(str.Substring(i, order));
+			}
+			return results.Distinct();
+		}
+
+		/// <summary>
+		/// Generates a dictionary of weighted n-grams from the given list of words.
+		/// The key is the ngram itself, and the value is the linear weight of the ngram.
+		/// </summary>
+		/// <param name="words">The words to n-gram-ise.</param>
+		/// <param name="order">The order of ngrams to generate.</param>
+		/// <returns>The weighted dictionary of ngrams.</returns>
+		public static Dictionary<string, int> GenerateWeighted(IEnumerable<string> words, int order)
+		{
+			Dictionary<string, int> results = new Dictionary<string, int>();
+			foreach(string word in words)
+			{
+				Dictionary<string, int> wordNgrams = GenerateWeighted(word, order);
+				foreach(KeyValuePair<string, int> ngram in wordNgrams)
+				{
+					if(!results.ContainsKey(ngram.Key))
+						results[ngram.Key] = 0;
+					results[ngram.Key] += ngram.Value;
+				}
+			}
+			return results;
+		}
+		/// <summary>
+		/// Generates a dictionary of weighted n-grams from the specified string.
+		/// </summary>
+		/// <param name="str">The string to n-gram-ise.</param>
+		/// <param name="order">The order of n-grams to generate.</param>
+		/// <returns>The weighted dictionary of ngrams.</returns>
+		public static Dictionary<string, int> GenerateWeighted(string str, int order)
+		{
+			Dictionary<string, int> results = new Dictionary<string, int>();
+			for(int i = 0; i < str.Length - order; i++)
+			{
+				string ngram = str.Substring(i, order);
+				if(!results.ContainsKey(ngram))
+					results[ngram] = 0;
+				results[ngram]++;
+			}
+			return results;
+		}
+	}
+}
diff --git a/MarkovGrams/Program.cs b/MarkovGrams/Program.cs
new file mode 100644
index 0000000..e7741ae
--- /dev/null
+++ b/MarkovGrams/Program.cs
@@ -0,0 +1,30 @@
+﻿using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace MarkovGrams
+{
+	class MainClass
+	{
+		public static void Main(string[] args)
+		{
+			if(args.Length != 3)
+			{
+				Console.WriteLine("Usage:");
+				Console.WriteLine("    ./MarkovGrams.exe <wordlist.txt> <order> <length>");
+				return;
+			}
+
+			string wordlistFilename = args[0];
+			int order = int.Parse(args[1]);
+			int desiredStringLength = int.Parse(args[2]);
+
+			IEnumerable<string> words = File.ReadLines(wordlistFilename);
+			IEnumerable<string> ngrams = NGrams.GenerateFlat(words, order);
+
+			UnweightedMarkovChain chain = new UnweightedMarkovChain(ngrams);
+
+			Console.WriteLine(chain.Generate(desiredStringLength));
+		}
+	}
+}
diff --git a/MarkovGrams/Properties/AssemblyInfo.cs b/MarkovGrams/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..3025aa3
--- /dev/null
+++ b/MarkovGrams/Properties/AssemblyInfo.cs
@@ -0,0 +1,26 @@
+﻿using System.Reflection;
+using System.Runtime.CompilerServices;
+
+// Information about this assembly is defined by the following attributes. 
+// Change them to the values specific to your project.
+
+[assembly: AssemblyTitle("MarkovGrams")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("")]
+[assembly: AssemblyCopyright("sbrl")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// The assembly version has the format "{Major}.{Minor}.{Build}.{Revision}".
+// The form "{Major}.{Minor}.*" will automatically update the build and revision,
+// and "{Major}.{Minor}.{Build}.*" will update just the revision.
+
+[assembly: AssemblyVersion("1.0.*")]
+
+// The following attributes are used to specify the signing key for the assembly, 
+// if desired. See the Mono documentation for more information about signing.
+
+//[assembly: AssemblyDelaySign(false)]
+//[assembly: AssemblyKeyFile("")]
diff --git a/MarkovGrams/UnweightedMarkovChain.cs b/MarkovGrams/UnweightedMarkovChain.cs
new file mode 100644
index 0000000..bef2e1c
--- /dev/null
+++ b/MarkovGrams/UnweightedMarkovChain.cs
@@ -0,0 +1,72 @@
+﻿using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace MarkovGrams
+{
+	/// <summary>
+	/// An unweighted character-based markov chain.
+	/// </summary>
+	public class UnweightedMarkovChain
+	{
+		/// <summary>
+		/// The random number generator
+		/// </summary>
+		Random rand = new Random();
+
+		/// <summary>
+		/// The ngrams that this markov chain currently contains.
+		/// </summary>
+		List<string> ngrams;
+
+		/// <summary>
+		/// Creates a new character-based markov chain.
+		/// </summary>
+		/// <param name="inNgrams">The ngrams to populate the new markov chain with.</param>
+		public UnweightedMarkovChain(IEnumerable<string> inNgrams)
+		{
+			ngrams = new List<string>(inNgrams);
+		}
+
+		/// <summary>
+		/// Returns a random ngram that's currently loaded into this UnweightedMarkovChain.
+		/// </summary>
+		/// <returns>A random ngram from this UnweightMarkovChain's cache of ngrams.</returns>
+		public string RandomNgram()
+		{
+			return ngrams[rand.Next(0, ngrams.Count)];
+		}
+
+		/// <summary>
+		/// Generates a new random string from the currently stored ngrams.
+		/// </summary>
+		/// <param name="length">
+		/// The length of ngram to generate.
+		/// Note that this is a target, not a fixed value - e.g. passing 2 when the n-gram order is 3 will
+		/// result in a string of length 3. Also, depending on the current ngrams this markov chain contains,
+		/// it may end up being cut short. 
+		/// </param>
+		/// <returns>A new random string.</returns>
+		public string Generate(int length)
+		{
+			string result = RandomNgram();
+			string lastNgram = result;
+			while(result.Length < length)
+			{
+				// The substring that the next ngram in the chain needs to start with
+				string nextStartsWith = lastNgram.Substring(1);
+				// Get a list of possible n-grams we could choose from next
+				List<string> nextNgrams = ngrams.FindAll(gram => gram.StartsWith(nextStartsWith));
+				// If there aren't any choices left, we can't exactly keep adding to the new string any more :-(
+				if(nextNgrams.Count == 0)
+					break;
+				// Pick a random n-gram from the list
+				string nextNgram = nextNgrams.ElementAt(rand.Next(0, nextNgrams.Count));
+				// Add the last character from the n-gram to the string we're building
+				result += nextNgram[nextNgram.Length - 1];
+			}
+
+			return result;
+		}
+	}
+}
