Initial commit

.gitignore

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+## 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/main/VisualStudio.gitignore
+
+# User-specific files
+*.rsuser
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Mono auto generated files
+mono_crash.*
+
+# Build results
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+[Dd]ebugPublic/
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+x86/
+[Ww][Ii][Nn]32/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
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+
+# Visual Studio 2015/2017 cache/options directory
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+Generated\ Files/
+
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+[Bb]uild[Ll]og.*
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+*.VisualState.xml
+TestResult.xml
+nunit-*.xml
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+# Build Results of an ATL Project
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+[Rr]eleasePS/
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+# Benchmark Results
+BenchmarkDotNet.Artifacts/
+
+# .NET Core
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+# ASP.NET Scaffolding
+ScaffoldingReadMe.txt
+
+# StyleCop
+StyleCopReport.xml
+
+# Files built by Visual Studio
+*_i.c
+*_p.c
+*_h.h
+*.ilk
+*.meta
+*.obj
+*.iobj
+*.pch
+*.pdb
+*.ipdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
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+*_wpftmp.csproj
+*.log
+*.tlog
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
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+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
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+*.cachefile
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+# Visual Studio profiler
+*.psess
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+*.vspx
+*.sap
+
+# Visual Studio Trace Files
+*.e2e
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# AxoCover is a Code Coverage Tool
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+!.axoCover/settings.json
+
+# Coverlet is a free, cross platform Code Coverage Tool
+coverage*.json
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+coverage*.info
+
+# Visual Studio code coverage results
+*.coverage
+*.coveragexml
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
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+AutoTest.Net/
+
+# Web workbench (sass)
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+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
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+DocProject/Help/*.HxT
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+# Click-Once directory
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+# Publish Web Output
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+# Note: Comment the next line if you want to checkin your web deploy settings,
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+# Microsoft Azure Web App publish settings. Comment the next line if you want to
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+# NuGet Packages
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+# except build/, which is used as an MSBuild target.
+!**/[Pp]ackages/build/
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+#!**/[Pp]ackages/repositories.config
+# NuGet v3's project.json files produces more ignorable files
+*.nuget.props
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+
+# Microsoft Azure Build Output
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+
+# Microsoft Azure Emulator
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+# Windows Store app package directories and files
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+Package.StoreAssociation.xml
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+# Visual Studio cache files
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+# but keep track of directories ending in .cache
+!?*.[Cc]ache/
+
+# Others
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+~$*
+*~
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+*.jfm
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+*.publishsettings
+orleans.codegen.cs
+
+# Including strong name files can present a security risk
+# (https://github.com/github/gitignore/pull/2483#issue-259490424)
+#*.snk
+
+# 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
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
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+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+ServiceFabricBackup/
+*.rptproj.bak
+
+# SQL Server files
+*.mdf
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+*.ndf
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+# Business Intelligence projects
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+*.bim.layout
+*.bim_*.settings
+*.rptproj.rsuser
+*- [Bb]ackup.rdl
+*- [Bb]ackup ([0-9]).rdl
+*- [Bb]ackup ([0-9][0-9]).rdl
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+node_modules/
+
+# Visual Studio 6 build log
+*.plg
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+# Visual Studio 6 workspace options file
+*.opt
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+# Visual Studio 6 auto-generated workspace file (contains which files were open etc.)
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+# Visual Studio 6 workspace and project file (working project files containing files to include in project)
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+# Visual Studio 6 technical files
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+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# CodeRush personal settings
+.cr/personal
+
+# Python Tools for Visual Studio (PTVS)
+__pycache__/
+*.pyc
+
+# Cake - Uncomment if you are using it
+# tools/**
+# !tools/packages.config
+
+# Tabs Studio
+*.tss
+
+# Telerik's JustMock configuration file
+*.jmconfig
+
+# BizTalk build output
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+*.btm.cs
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+# Azure Stream Analytics local run output
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+# MSBuild Binary and Structured Log
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+# NVidia Nsight GPU debugger configuration file
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+# Local History for Visual Studio
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+# Visual Studio History (VSHistory) files
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+# BeatPulse healthcheck temp database
+healthchecksdb
+
+# Backup folder for Package Reference Convert tool in Visual Studio 2017
+MigrationBackup/
+
+# Ionide (cross platform F# VS Code tools) working folder
+.ionide/
+
+# Fody - auto-generated XML schema
+FodyWeavers.xsd
+
+# VS Code files for those working on multiple tools
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+*.code-workspace
+
+# Local History for Visual Studio Code
+.history/
+
+# Windows Installer files from build outputs
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# JetBrains Rider
+*.sln.iml

Ruler/Ruler.cs

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+
+using System.Linq;
+using System.Linq.Expressions;
+
+namespace Ruler;
+
+
+public record FilterPolicy(
+	string name, 
+	string[] properties, 
+	IEnumerable<(string, string)> scope, 
+	FilterPolicyExtensions.RuleOperator ruleOperator=FilterPolicyExtensions.RuleOperator.And
+	);
+
+// Taken from LinqKit, Joseph Albahari. Man is a legend.
+// LINQKit Copyright (c) 2007-2009 Joseph Albahari, Tomas Petricek
+// 
+// The Expression Visitor class is based on a Microsoft sample.
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+public static class PredicateBuilder
+{
+	public static Expression<Func<T, bool>> True<T>() { return f => true; }
+	public static Expression<Func<T, bool>> False<T>() { return f => false; }
+
+	public static Expression<Func<T, bool>> Or<T>(this Expression<Func<T, bool>> expr1,
+														Expression<Func<T, bool>> expr2)
+	{
+		var invokedExpr = Expression.Invoke(expr2, expr1.Parameters.Cast<Expression>());
+		return Expression.Lambda<Func<T, bool>>
+			  (Expression.OrElse(expr1.Body, invokedExpr), expr1.Parameters);
+	}
+
+	public static Expression<Func<T, bool>> And<T>(this Expression<Func<T, bool>> expr1,
+														 Expression<Func<T, bool>> expr2)
+	{
+		var invokedExpr = Expression.Invoke(expr2, expr1.Parameters.Cast<Expression>());
+		return Expression.Lambda<Func<T, bool>>
+			  (Expression.AndAlso(expr1.Body, invokedExpr), expr1.Parameters);
+	}
+}
+
+
+public static class FilterPolicyExtensions
+{
+	public enum RuleOperator {
+		And,
+		Or
+	}
+
+	// Dynamicall build an expression suitable for filtering in a Where clause
+	public static Expression<Func<T, bool>> GetFilterForType<T>(string property, string value)
+	{
+		var parameter = Expression.Parameter(typeof(T), "x");
+		var opLeft = Expression.Property(parameter, property);
+
+		var opRight = Expression.Constant(value);
+		var comparison = Expression.Equal(opLeft, opRight);
+
+		return Expression.Lambda<Func<T, bool>>(comparison, parameter);
+	}
+
+	// Combine a list of expressions inclusively
+	public static Expression<Func<T, bool>> CombineAnd<T>(IEnumerable<Expression<Func<T, bool>>> predicates)
+	{
+		if (predicates.Count() == 0) return null;
+
+		var final = predicates.First();
+		foreach (var next in predicates.Skip(1))
+			final = PredicateBuilder.And(final, next);
+	
+		return final;
+	}
+
+
+	// Combine a list of expressions inclusively
+	public static Expression<Func<T, bool>> CombineOr<T>(IEnumerable<Expression<Func<T, bool>>> predicates)
+	{
+		if (predicates.Count() == 0) return null;
+
+		var final = predicates.First();
+		foreach (var next in predicates.Skip(1))
+			final = PredicateBuilder.Or(final, next);
+
+		return final;
+	}
+
+
+	// Combine a list of expressions inclusively
+	public static Expression<Func<T, bool>> CombinePredicates<T>(IEnumerable<Expression<Func<T, bool>>> predicates, FilterPolicyExtensions.RuleOperator op)
+	{
+		if (predicates.Count() == 0) return null;
+
+		if (op == RuleOperator.And)
+		{
+			return CombineAnd(predicates);
+		}
+		return CombineOr(predicates);
+	}
+
+
+	public static Expression<Func<T, bool>> GetFilterExpression<T>(this FilterPolicy policy)
+	{
+		var predicates = new List<Expression<Func<T, bool>>>();
+		foreach (var constraints in policy.scope)
+		{
+			predicates.Add(GetFilterForType<T>(constraints.Item1, constraints.Item2));
+		}
+		
+		return CombinePredicates<T>(predicates, policy.ruleOperator);
+	}
+}

Ruler/Ruler.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

RulerDev/MyExtensions.cs

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+using System;
+using Newtonsoft.Json;
+
+namespace RulerDev;
+
+public static class MyExtensions {
+    
+    public static object Dump(this object thing, params string[]? msgs) {
+        if (msgs != null && msgs.Length > 0) {
+            Console.WriteLine("> {0}\n", string.Join(", ", msgs));
+        }
+
+        if (thing is String) {
+            Console.WriteLine(thing);
+        } else {
+            Console.WriteLine(JsonConvert.SerializeObject(thing, Formatting.Indented));
+        }
+        return thing;
+    }
+
+}

RulerDev/Program.cs

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+
+using Ruler;
+using System;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Collections.Generic;
+
+using static RulerDev.MyExtensions;
+
+var users = new List<User> {
+    new User("Sean","McArdle","971-900-7335","503-555-1245", "SDC", "DAS"),
+    new User("Brian","Chamberland","971-900-7335","503-555-1245", "SDC", "DAS"),
+    new User("Brian","Tong","971-900-7335","503-555-1245", "SDC", "DAS"),
+    new User("Brian","Chytka","971-900-7335","503-555-1245", "3990 Fairview", "ODHSOHA"),
+    new User("Fariborz", "Pakseresht","971-900-7335","503-555-1245", "500 Summer", "ODHS"),
+    new User("Simon","Hayes","971-900-7335","503-555-1245", "3990 Fairview", "OHA"),
+    new User("Tess","McArdle","971-555-7335","503-555-5555", "Home", "HomeSchool")
+}.AsQueryable();
+
+//users.Dump();
+
+var filterPolicy = new FilterPolicy (
+    "DHS or OHA",
+    new string[] {}, // Can't do anything with this yet
+
+    new List<(string, string)>{
+        ("agency", "ODHSOHA")
+        ,("agency", "ODHS")
+        ,("agency", "OHA")
+    },
+    FilterPolicyExtensions.RuleOperator.Or
+);
+var filterExpression = filterPolicy.GetFilterExpression<User>();
+filterPolicy.Dump(filterPolicy.name);
+users.Where(filterExpression).Dump($"{filterPolicy.name} operator {filterPolicy.ruleOperator}");
+
+
+
+filterPolicy = new FilterPolicy(
+    "All DAS Brians",
+    new string[] { }, // Can't do anything with this yet
+    new List<(string, string)>{
+            ("first", "Brian")
+            ,("agency", "DAS")
+    });
+filterExpression = filterPolicy.GetFilterExpression<User>();
+filterPolicy.Dump(filterPolicy.name);
+users.Where(filterExpression).Dump($"operator {filterPolicy.ruleOperator}");
+
+
+
+var dynamicFilterDAS = FilterPolicyExtensions.GetFilterForType<User>("agency", "DAS");
+users.Where(dynamicFilterDAS).Dump("DAS users");
+
+var dynamicFilterBrian = FilterPolicyExtensions.GetFilterForType<User>("first","Brian");
+
+var policies = new List<Expression<Func<User,bool>>>();
+policies.Add(dynamicFilterDAS);
+policies.Add(dynamicFilterBrian);
+var combined = FilterPolicyExtensions.CombineAnd(policies);
+
+users.Where(dynamicFilterBrian).Dump("All Brian's");
+(from u in users.Where(combined)
+    select new { u.first, u.last, u.agency}).Dump("All Brian's from DAS");
+
+
+
+record User(string first, string last, string workPhone, string homePhone, string workAddress, string agency);
+
+

RulerDev/RulerDev.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <ItemGroup>
+    <ProjectReference Include="..\Ruler\Ruler.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+  </ItemGroup>
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>