omy.Utils 1.1.1.1

Utils Library

The Utils library is a large collection of helper namespaces covering many common programming needs. It targets .NET 9 and is the base dependency for the other utility packages contained in this repository.

Features

• Async – asynchronous execution helpers
• Arrays – helpers for comparing arrays, working with multi-dimensional data and specialized comparers
• Collections – indexed lists, skip lists, LRU caches and dictionary extensions
• Expressions – creation and transformation of expression trees and lambda utilities
• Files – filesystem helpers to manipulate paths and temporary files
• Mathematics – base classes for expression transformation and math functions
• Net – advanced URI builder and network helpers
• Objects – data conversion routines and an advanced string formatter
• Reflection – additional reflection primitives such as PropertyOrFieldInfo and delegate invocation helpers
• Resources – utilities for working with embedded resources
• Security – Google Authenticator helpers
• Streams – base16/base32/base64 converters and binary serialization
• Transactions – execute a batch of reversible actions and commit or rollback as a group
• XML – helpers for XML processing

The design separates data structures from processing logic wherever possible and exposes extensibility points through interfaces.

Usage examples

Short snippets demonstrating typical API usage:

Transactions

using Utils.Transactions;

class SampleAction : ITransactionalAction
{
    public void Execute() { /* work */ }
    public void Commit() { /* finalize */ }
    public void Rollback() { /* undo */ }
}

TransactionExecutor executor = new TransactionExecutor();
executor.Execute([
    new SampleAction(),
    new SampleAction(),
]);

Async

using Utils.Async;
IAsyncExecutor executor = new AsyncExecutor();
Func<Task>[] actions =
[
    async () => await Task.Delay(100),
    async () => await Task.Delay(100),
    async () => await Task.Delay(100),
];
await executor.ExecuteAsync(actions, 3); // chooses parallel execution

Arrays

using Utils.Arrays;
int[] values = [0, 1, 2, 0];
int[] trimmed = values.Trim(0); // [1, 2]

Collections

var cache = new Utils.Collections.LRUCache<int, string>(2);
cache.Add(1, "one");
cache.Add(2, "two");
cache[1];
cache.Add(3, "three"); // evicts key 2
var dict = new Dictionary<string, int>();
// Thread-safe dictionary insertion
int one = dict.GetOrAdd("one", () => 1);

Files

// Search executables four levels deep under "Program Files"
foreach (string exe in Utils.Files.PathUtils.EnumerateFiles(@"C:\\Program Files\\*\\*\\*\\*.exe"))
{
    Console.WriteLine(exe);
}

Reflection

var info = new Utils.Reflection.PropertyOrFieldInfo(typeof(MyType).GetField("Id"));
int id = (int)info.GetValue(myObj);
info.SetValue(myObj, 42);

var invoker = new Utils.Reflection.MultiDelegateInvoker<int, int>(2);
invoker.Add(i => i + 1);
invoker.Add(i => i + 2);
int[] values = await invoker.InvokeSmartAsync(3); // [4, 5]

Resources

var res = new Utils.Resources.ExternalResource("Strings");
string text = (string)res["Welcome"];

Strings

using Utils.Objects;
bool match = "File123.log".Like("File???.log");
string normalized = "---hello---".Trim(c => c == '-');
string path = "report".AddPrefix("out_").AddSuffix(".txt");
string title = "hello world".FirstLetterUpperCase();

Security

byte[] key = Convert.FromBase64String("MFRGGZDFMZTWQ2LK");
var authenticator = Utils.Security.Authenticator.GoogleAuthenticator(key);
string code = authenticator.ComputeAuthenticator();
bool ok = authenticator.VerifyAuthenticator(1, code);

Dates

DateTime result = new DateTime(2023, 3, 15)
    .Calculate("FM+1J", new CultureInfo("fr-FR")); // 2023-04-01

// Adding three working days while skipping weekends
ICalendarProvider calendar = new WeekEndCalendarProvider();
DateTime dueDate = new DateTime(2024, 4, 5).AddWorkingDays(3, calendar); // 2024-04-10

// Using working days inside a formula
ICalendarProvider calendar = new WeekEndCalendarProvider();
DateTime value = new DateTime(2024, 4, 5)
    .Calculate("FS+3O", new CultureInfo("fr-FR"), calendar); // 2024-04-10

// Finding the next or previous working day
ICalendarProvider calendar = new WeekEndCalendarProvider();
DateTime next = new DateTime(2024, 4, 6).NextWorkingDay(calendar);     // 2024-04-08
DateTime prev = new DateTime(2024, 4, 6).PreviousWorkingDay(calendar); // 2024-04-05

// Adjusting the result of a formula to the next working day
ICalendarProvider calendar = new WeekEndCalendarProvider();
DateTime adjusted = new DateTime(2024, 4, 6)
    .Calculate("FS+O", new CultureInfo("fr-FR"), calendar); // 2024-04-08

Expressions

var expression = "(items) => items[0] + items[1]";
var lambda = Utils.Expressions.ExpressionParser.Parse<Func<string[], string>>(expression);
Func<string[], string> concat = lambda.Compile();
string result = concat(new[] { "Hello", "World" });

var switchExpr = "(i) => switch(i) { case 1: 10; case 2: 20; default: 0; }";
var switchLambda = Utils.Expressions.ExpressionParser.Parse<Func<int, int>>(switchExpr);
int value = switchLambda.Compile()(2); // 20

var switchStmt = "(int i) => { int v = 0; switch(i) { case 1: v = 10; break; case 2: v = 20; break; default: v = 0; break; } return v; }";
var switchFunc = Utils.Expressions.ExpressionParser.Parse<Func<int, int>>(switchStmt).Compile();
int result = switchFunc(1); // 10

var formatter = Utils.String.StringFormat.Create<Func<string, string>, DefaultInterpolatedStringHandler>("Name: {name}", "name");
string formatted = formatter("John");

var interp = Utils.Expressions.ExpressionParser.Parse<Func<string, string, string>>("(a,b)=>$\"{a} {b}!\"").Compile();
string hello = interp("hello", "world"); // hello world!

Numerics

using Utils.Numerics;

Number a = Number.Parse("0.1");
Number b = Number.Parse("0.2");
Number sum = a + b; // 0.3
Number big = Number.Parse("123456789012345678901234567890") + 1;
Number.TryParse("42", null, out Number parsed);
Number pow = Number.Pow(2, 3); // 8
Number angle = Number.Parse("0.5");
Number cosine = Number.Cos(angle); // 0.8775825618903728

XML

using var reader = XmlReader.Create("items.xml");
reader.ReadToDescendant("item");
foreach (var child in reader.ReadChildElements())
{
    Console.WriteLine(child.ReadOuterXml());
}