mirror of
https://github.com/zoriya/Kyoo.git
synced 2025-11-03 19:17:16 -05:00
298 lines
12 KiB
C#
298 lines
12 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection;
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using System.Runtime.ExceptionServices;
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using System.Text;
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using System.Text.RegularExpressions;
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using JetBrains.Annotations;
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namespace Kyoo
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{
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/// <summary>
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/// A set of utility functions that can be used everywhere.
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/// </summary>
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public static class Utility
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{
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/// <summary>
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/// Is the lambda expression a member (like x => x.Body).
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/// </summary>
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/// <param name="ex">The expression that should be checked</param>
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/// <returns>True if the expression is a member, false otherwise</returns>
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public static bool IsPropertyExpression(LambdaExpression ex)
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{
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if (ex == null)
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return false;
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return ex.Body is MemberExpression ||
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ex.Body.NodeType == ExpressionType.Convert && ((UnaryExpression)ex.Body).Operand is MemberExpression;
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}
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/// <summary>
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/// Get the name of a property. Useful for selectors as members ex: Load(x => x.Shows)
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/// </summary>
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/// <param name="ex">The expression</param>
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/// <returns>The name of the expression</returns>
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/// <exception cref="ArgumentException">If the expression is not a property, ArgumentException is thrown.</exception>
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public static string GetPropertyName(LambdaExpression ex)
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{
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if (!IsPropertyExpression(ex))
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throw new ArgumentException($"{ex} is not a property expression.");
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MemberExpression member = ex.Body.NodeType == ExpressionType.Convert
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? ((UnaryExpression)ex.Body).Operand as MemberExpression
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: ex.Body as MemberExpression;
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return member!.Member.Name;
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}
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/// <summary>
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/// Get the value of a member (property or field)
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/// </summary>
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/// <param name="member">The member value</param>
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/// <param name="obj">The owner of this member</param>
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/// <returns>The value boxed as an object</returns>
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/// <exception cref="ArgumentNullException">if <see cref="member"/> or <see cref="obj"/> is null.</exception>
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/// <exception cref="ArgumentException">The member is not a field or a property.</exception>
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public static object GetValue([NotNull] this MemberInfo member, [NotNull] object obj)
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{
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if (member == null)
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throw new ArgumentNullException(nameof(member));
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if (obj == null)
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throw new ArgumentNullException(nameof(obj));
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return member switch
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{
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PropertyInfo property => property.GetValue(obj),
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FieldInfo field => field.GetValue(obj),
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_ => throw new ArgumentException($"Can't get value of a non property/field (member: {member}).")
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};
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}
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/// <summary>
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/// Slugify a string (Replace spaces by -, Uniformize accents é -> e)
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/// </summary>
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/// <param name="str">The string to slugify</param>
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/// <returns>The slug version of the given string</returns>
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public static string ToSlug(string str)
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{
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if (str == null)
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return null;
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str = str.ToLowerInvariant();
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string normalizedString = str.Normalize(NormalizationForm.FormD);
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StringBuilder stringBuilder = new();
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foreach (char c in normalizedString)
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{
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UnicodeCategory unicodeCategory = CharUnicodeInfo.GetUnicodeCategory(c);
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if (unicodeCategory != UnicodeCategory.NonSpacingMark)
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stringBuilder.Append(c);
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}
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str = stringBuilder.ToString().Normalize(NormalizationForm.FormC);
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str = Regex.Replace(str, @"\s", "-", RegexOptions.Compiled);
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str = Regex.Replace(str, @"[^\w\s\p{Pd}]", "", RegexOptions.Compiled);
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str = str.Trim('-', '_');
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str = Regex.Replace(str, @"([-_]){2,}", "$1", RegexOptions.Compiled);
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return str;
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}
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/// <summary>
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/// Get the default value of a type.
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/// </summary>
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/// <param name="type">The type to get the default value</param>
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/// <returns>The default value of the given type.</returns>
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public static object GetClrDefault(this Type type)
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{
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return type.IsValueType
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? Activator.CreateInstance(type)
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: null;
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}
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/// <summary>
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/// Return every <see cref="Type"/> in the inheritance tree of the parameter (interfaces are not returned)
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/// </summary>
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/// <param name="type">The starting type</param>
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/// <returns>A list of types</returns>
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/// <exception cref="ArgumentNullException"><see cref="type"/> can't be null</exception>
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public static IEnumerable<Type> GetInheritanceTree([NotNull] this Type type)
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{
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if (type == null)
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throw new ArgumentNullException(nameof(type));
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for (; type != null; type = type.BaseType)
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yield return type;
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}
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/// <summary>
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/// Check if <see cref="obj"/> inherit from a generic type <see cref="genericType"/>.
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/// </summary>
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/// <param name="obj">Does this object's type is a <see cref="genericType"/></param>
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/// <param name="genericType">The generic type to check against (Only generic types are supported like typeof(IEnumerable<>).</param>
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/// <returns>True if obj inherit from genericType. False otherwise</returns>
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/// <exception cref="ArgumentNullException">obj and genericType can't be null</exception>
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public static bool IsOfGenericType([NotNull] object obj, [NotNull] Type genericType)
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{
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if (obj == null)
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throw new ArgumentNullException(nameof(obj));
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return IsOfGenericType(obj.GetType(), genericType);
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}
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/// <summary>
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/// Check if <see cref="type"/> inherit from a generic type <see cref="genericType"/>.
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/// </summary>
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/// <param name="type">The type to check</param>
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/// <param name="genericType">The generic type to check against (Only generic types are supported like typeof(IEnumerable<>).</param>
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/// <returns>True if obj inherit from genericType. False otherwise</returns>
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/// <exception cref="ArgumentNullException">obj and genericType can't be null</exception>
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public static bool IsOfGenericType([NotNull] Type type, [NotNull] Type genericType)
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{
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if (type == null)
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throw new ArgumentNullException(nameof(type));
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if (genericType == null)
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throw new ArgumentNullException(nameof(genericType));
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if (!genericType.IsGenericType)
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throw new ArgumentException($"{nameof(genericType)} is not a generic type.");
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IEnumerable<Type> types = genericType.IsInterface
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? type.GetInterfaces()
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: type.GetInheritanceTree();
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return types.Any(x => x.IsGenericType && x.GetGenericTypeDefinition() == genericType);
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}
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/// <summary>
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/// Get the generic definition of <see cref="genericType"/>.
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/// For example, calling this function with List<string> and typeof(IEnumerable<>) will return IEnumerable<string>
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/// </summary>
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/// <param name="type">The type to check</param>
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/// <param name="genericType">The generic type to check against (Only generic types are supported like typeof(IEnumerable<>).</param>
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/// <returns>The generic definition of genericType that type inherit or null if type does not implement the generic type.</returns>
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/// <exception cref="ArgumentNullException"><see cref="type"/> and <see cref="genericType"/> can't be null</exception>
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/// <exception cref="ArgumentException"><see cref="genericType"/> must be a generic type</exception>
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public static Type GetGenericDefinition([NotNull] Type type, [NotNull] Type genericType)
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{
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if (type == null)
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throw new ArgumentNullException(nameof(type));
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if (genericType == null)
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throw new ArgumentNullException(nameof(genericType));
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if (!genericType.IsGenericType)
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throw new ArgumentException($"{nameof(genericType)} is not a generic type.");
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IEnumerable<Type> types = genericType.IsInterface
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? type.GetInterfaces()
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: type.GetInheritanceTree();
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return types.FirstOrDefault(x => x.IsGenericType && x.GetGenericTypeDefinition() == genericType);
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}
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public static MethodInfo GetMethod(Type type, BindingFlags flag, string name, Type[] generics, object[] args)
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{
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MethodInfo[] methods = type.GetMethods(flag | BindingFlags.Public)
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.Where(x => x.Name == name)
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.Where(x => x.GetGenericArguments().Length == generics.Length)
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.Where(x => x.GetParameters().Length == args.Length)
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.IfEmpty(() => throw new NullReferenceException($"A method named {name} with " +
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$"{args.Length} arguments and {generics.Length} generic " +
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$"types could not be found on {type.Name}."))
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// TODO this won't work but I don't know why.
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// .Where(x =>
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// {
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// int i = 0;
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// return x.GetGenericArguments().All(y => y.IsAssignableFrom(generics[i++]));
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// })
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// .IfEmpty(() => throw new NullReferenceException($"No method {name} match the generics specified."))
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// TODO this won't work for Type<T> because T is specified in arguments but not in the parameters type.
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// .Where(x =>
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// {
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// int i = 0;
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// return x.GetParameters().All(y => y.ParameterType.IsInstanceOfType(args[i++]));
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// })
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// .IfEmpty(() => throw new NullReferenceException($"No method {name} match the parameters's types."))
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.Take(2)
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.ToArray();
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if (methods.Length == 1)
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return methods[0];
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throw new NullReferenceException($"Multiple methods named {name} match the generics and parameters constraints.");
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}
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public static T RunGenericMethod<T>(
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[NotNull] Type owner,
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[NotNull] string methodName,
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[NotNull] Type type,
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params object[] args)
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{
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return RunGenericMethod<T>(owner, methodName, new[] {type}, args);
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}
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public static T RunGenericMethod<T>(
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[NotNull] Type owner,
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[NotNull] string methodName,
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[NotNull] Type[] types,
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params object[] args)
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{
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if (owner == null)
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throw new ArgumentNullException(nameof(owner));
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if (methodName == null)
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throw new ArgumentNullException(nameof(methodName));
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if (types == null)
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throw new ArgumentNullException(nameof(types));
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if (types.Length < 1)
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throw new ArgumentException($"The {nameof(types)} array is empty. At least one type is needed.");
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MethodInfo method = GetMethod(owner, BindingFlags.Static, methodName, types, args);
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return (T)method.MakeGenericMethod(types).Invoke(null, args?.ToArray());
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}
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public static T RunGenericMethod<T>(
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[NotNull] object instance,
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[NotNull] string methodName,
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[NotNull] Type type,
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params object[] args)
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{
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return RunGenericMethod<T>(instance, methodName, new[] {type}, args);
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}
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public static T RunGenericMethod<T>(
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[NotNull] object instance,
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[NotNull] string methodName,
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[NotNull] Type[] types,
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params object[] args)
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{
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if (instance == null)
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throw new ArgumentNullException(nameof(instance));
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if (methodName == null)
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throw new ArgumentNullException(nameof(methodName));
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if (types == null || types.Length == 0)
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throw new ArgumentNullException(nameof(types));
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MethodInfo method = GetMethod(instance.GetType(), BindingFlags.Instance, methodName, types, args);
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return (T)method.MakeGenericMethod(types).Invoke(instance, args?.ToArray());
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}
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public static string ToQueryString(this Dictionary<string, string> query)
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{
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if (!query.Any())
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return string.Empty;
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return "?" + string.Join('&', query.Select(x => $"{x.Key}={x.Value}"));
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}
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[System.Diagnostics.CodeAnalysis.DoesNotReturn]
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public static void ReThrow([NotNull] this Exception ex)
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{
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if (ex == null)
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throw new ArgumentNullException(nameof(ex));
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ExceptionDispatchInfo.Capture(ex).Throw();
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}
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/// <summary>
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/// Get a friendly type name (supporting generics)
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/// For example a list of string will be displayed as List<string> and not as List`1.
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/// </summary>
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/// <param name="type">The type to use</param>
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/// <returns>The friendly name of the type</returns>
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public static string FriendlyName(this Type type)
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{
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if (!type.IsGenericType)
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return type.Name;
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string generics = string.Join(", ", type.GetGenericArguments().Select(x => x.FriendlyName()));
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return $"{type.Name[..type.Name.IndexOf('`')]}<{generics}>";
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}
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}
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} |