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using Mono.Cecil;
using System;
using System.Linq;
using System.Reflection;
using System.Text;
namespace WebApiClient.BuildTask
{
/// <summary>
/// 表示cecil元数据抽象
/// </summary>
abstract class CeMetadata
{
/// <summary>
/// 所在程序集
/// </summary>
private readonly ModuleDefinition module;
/// <summary>
/// 所有已知类型
/// </summary>
private readonly TypeDefinition[] knowTypes;
/// <summary>
/// 获取系统类型
/// </summary>
public TypeSystem TypeSystem { get; private set; }
/// <summary>
/// cecil元数据抽象
/// </summary>
/// <param name="module">所在程序集</param>
public CeMetadata(CeAssembly assembly)
{
this.module = assembly.MainMdule;
this.knowTypes = assembly.KnowTypes;
this.TypeSystem = this.module.TypeSystem;
}
/// <summary>
/// 返回导入外部类型后的类型
/// </summary>
/// <typeparam name="T">目标类型</typeparam>
/// <exception cref="NotSupportedException"></exception>
/// <exception cref="TypeLoadException"></exception>
/// <returns></returns>
protected TypeReference ImportType<T>()
{
var type = typeof(T);
if (type.IsArray == true)
{
throw new NotSupportedException("不支持数组类型");
}
var knowType = this.knowTypes.FirstOrDefault(item => item.FullName == type.FullName);
if (knowType == null)
{
// 本程序集的类型不作直接导入
if (this.IsThisAssemblyType(type) == true)
{
throw new TypeLoadException($"找不到类型：{type.FullName}");
}
return this.module.ImportReference(type);
}
else
{
return this.module.ImportReference(knowType);
}
}
/// <summary>
/// 返回指定类型是在本程序集范围内
/// </summary>
/// <param name="type">类型</param>
/// <returns></returns>
private bool IsThisAssemblyType(Type type)
{
#if NETCOREAPP1_1
return type.GetTypeInfo().Assembly == this.GetType().GetTypeInfo().Assembly;
#else
return type.Assembly == this.GetType().Assembly;
#endif
}
/// <summary>
/// 返回导入外部类型的指定方法后的方法
/// </summary>
/// <param name="methodName">方法名</param>
/// <exception cref="ArgumentException"></exception>
/// <exception cref="NotSupportedException"></exception>
/// <exception cref="TypeLoadException"></exception>
/// <returns></returns>
protected MethodReference ImportMethod<T>(string methodName)
{
return this.ImportMethod<T>(item => item.Name == methodName);
}
/// <summary>
/// 返回导入外部类型的指定方法后的方法
/// </summary>
/// <param name="filter">方法过滤器</param>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="NotSupportedException"></exception>
/// <exception cref="ArgumentException"></exception>
/// <exception cref="TypeLoadException"></exception>
/// <returns></returns>
protected MethodReference ImportMethod<T>(Func<MethodDefinition, bool> filter)
{
if (filter == null)
{
throw new ArgumentNullException(nameof(filter));
}
var method = this.ImportType<T>().Resolve().Methods.FirstOrDefault(filter);
if (method == null)
{
throw new ArgumentException("无法找到指定的方法");
}
return this.module.ImportReference(method);
}
/// <summary>
/// 比较两类型类型是一样
/// </summary>
/// <param name="source">类型</param>
/// <param name="target">目标类型</param>
/// <exception cref="ArgumentNullException"></exception>
/// <returns></returns>
protected bool IsTypeEquals(TypeReference source, Type target)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (target == null)
{
throw new ArgumentNullException(nameof(target));
}
return source.FullName == target.FullName;
}
/// <summary>
/// 返回方法的完整名称
/// </summary>
/// <param name="method">方法</param>
/// <returns></returns>
protected string GetMethodFullName(MethodReference method)
{
var builder = new StringBuilder();
foreach (var p in method.Parameters)
{
if (builder.Length > 0)
{
builder.Append(",");
}
builder.Append(GetTypeName(p.ParameterType));
}
var insert = $"{GetTypeName(method.ReturnType)} {method.Name}(";
return builder.Insert(0, insert).Append(")").ToString();
}
/// <summary>
/// 返回类型不含namespace的名称
/// </summary>
/// <param name="type">类型</param>
/// <returns></returns>
private static string GetTypeName(TypeReference type)
{
if (type.IsGenericInstance == false)
{
return type.Name;
}
var builder = new StringBuilder();
var parameters = ((GenericInstanceType)type).GenericArguments;
foreach (var p in parameters)
{
if (builder.Length > 0)
{
builder.Append(",");
}
builder.Append(GetTypeName(p));
}
return builder.Insert(0, $"{type.Name}<").Append(">").ToString();
}
}
}