/
ReflectionHelper.cs
163 lines (142 loc) · 6.19 KB
/
ReflectionHelper.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
// Copyright (c) Nate McMaster.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Reflection;
using System.Threading;
using McMaster.Extensions.CommandLineUtils.Abstractions;
namespace McMaster.Extensions.CommandLineUtils
{
internal static class ReflectionHelper
{
private const BindingFlags DeclaredOnlyLookup = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static | BindingFlags.DeclaredOnly;
public static SetPropertyDelegate GetPropertySetter(PropertyInfo prop)
{
var setter = prop.GetSetMethod(nonPublic: true);
if (setter != null)
{
return (obj, value) => setter.Invoke(obj, new object?[] { value });
}
else
{
var backingField = prop.DeclaringType.GetField($"<{prop.Name}>k__BackingField", DeclaredOnlyLookup);
if (backingField == null)
{
throw new InvalidOperationException(
$"Could not find a way to set {prop.DeclaringType.FullName}.{prop.Name}. Try adding a private setter.");
}
return (obj, value) => backingField.SetValue(obj, value);
}
}
public static GetPropertyDelegate GetPropertyGetter(PropertyInfo prop)
{
var getter = prop.GetGetMethod(nonPublic: true);
if (getter != null)
{
return obj => getter.Invoke(obj, new object[] { });
}
else
{
var backingField = prop.DeclaringType.GetField($"<{prop.Name}>k__BackingField", DeclaredOnlyLookup);
if (backingField == null)
{
throw new InvalidOperationException(
$"Could not find a way to get {prop.DeclaringType.FullName}.{prop.Name}. Try adding a getter.");
}
return obj => backingField.GetValue(obj);
}
}
public static MethodInfo[] GetPropertyOrMethod(Type type, string name)
{
var members = GetAllMembers(type).ToList();
return members
.OfType<MethodInfo>()
.Where(m => m.Name == name)
.Concat(members.OfType<PropertyInfo>().Where(m => m.Name == name).Select(p => p.GetMethod))
.Where(m => m.ReturnType == typeof(string) && m.GetParameters().Length == 0)
.ToArray();
}
public static PropertyInfo[] GetProperties(Type type)
{
return GetAllMembers(type)
.OfType<PropertyInfo>()
.ToArray();
}
public static MemberInfo[] GetMembers(Type type)
{
return GetAllMembers(type).ToArray();
}
public static object?[] BindParameters(MethodInfo method, CommandLineApplication command, CancellationToken cancellationToken)
{
var methodParams = method.GetParameters();
var arguments = new object?[methodParams.Length];
for (var i = 0; i < methodParams.Length; i++)
{
var methodParam = methodParams[i];
if (typeof(CommandLineApplication).IsAssignableFrom(methodParam.ParameterType))
{
arguments[i] = command;
}
else if (typeof(IConsole).IsAssignableFrom(methodParam.ParameterType))
{
arguments[i] = command._context.Console;
}
else if (typeof(ValidationResult).IsAssignableFrom(methodParam.ParameterType))
{
arguments[i] = command.GetValidationResult();
}
else if (typeof(CommandLineContext).IsAssignableFrom(methodParam.ParameterType))
{
arguments[i] = command._context;
}
else if (typeof(CancellationToken) == methodParam.ParameterType && cancellationToken != CancellationToken.None)
{
arguments[i] = cancellationToken;
}
else
{
var service = command.AdditionalServices?.GetService(methodParam.ParameterType);
arguments[i] = service ?? throw new InvalidOperationException(Strings.UnsupportedParameterTypeOnMethod(method.Name, methodParam));
}
}
return arguments;
}
public static bool IsNullableType(Type type, [NotNullWhen(true)] out Type? wrappedType)
{
var result = type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>);
wrappedType = result ? type.GetGenericArguments().First() : null;
return result;
}
public static bool IsSpecialValueTupleType(Type type, [NotNullWhen(true)] out Type? wrappedType)
{
var result = type.IsGenericType &&
type.GetGenericTypeDefinition() == typeof(ValueTuple<,>) &&
type.GenericTypeArguments[0] == typeof(bool);
wrappedType = result ? type.GenericTypeArguments[1] : null;
return result;
}
public static bool IsSpecialTupleType(Type type, [NotNullWhen(true)] out Type? wrappedType)
{
var result = type.IsGenericType &&
type.GetGenericTypeDefinition() == typeof(Tuple<,>) &&
type.GenericTypeArguments[0] == typeof(bool);
wrappedType = result ? type.GenericTypeArguments[1] : null;
return result;
}
private static IEnumerable<MemberInfo> GetAllMembers(Type type)
{
while (type != null)
{
var members = type.GetMembers(DeclaredOnlyLookup);
foreach (var member in members)
{
yield return member;
}
type = type.BaseType;
}
}
}
}