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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Text;
namespace Internal.TypeSystem
{
/// <summary>
/// Provides a name formatter attempts to produce unique names given a type.
/// The exact format of this type name provider is not considered stable or suited for parsing at this time.
/// </summary>
public class UniqueTypeNameFormatter : TypeNameFormatter
{
public static UniqueTypeNameFormatter Instance { get; } = new UniqueTypeNameFormatter();
public override void AppendName(StringBuilder sb, PointerType type)
{
AppendName(sb, type.ParameterType);
sb.Append('*');
}
public override void AppendName(StringBuilder sb, GenericParameterDesc type)
{
string prefix = type.Kind == GenericParameterKind.Type ? "!" : "!!";
sb.Append(prefix);
sb.Append(type.Name);
}
public override void AppendName(StringBuilder sb, SignatureTypeVariable type)
{
sb.Append("!");
sb.Append(type.Index.ToStringInvariant());
}
public override void AppendName(StringBuilder sb, SignatureMethodVariable type)
{
sb.Append("!!");
sb.Append(type.Index.ToStringInvariant());
}
public override void AppendName(StringBuilder sb, FunctionPointerType type)
{
MethodSignature signature = type.Signature;
AppendName(sb, signature.ReturnType);
sb.Append(" (");
for (int i = 0; i < signature.Length; i++)
{
if (i > 0)
sb.Append(", ");
AppendName(sb, signature[i]);
}
// TODO: Append '...' for vararg methods
sb.Append(')');
}
public override void AppendName(StringBuilder sb, ByRefType type)
{
AppendName(sb, type.ParameterType);
sb.Append(" ByRef");
}
public override void AppendName(StringBuilder sb, ArrayType type)
{
AppendName(sb, type.ElementType);
sb.Append('[');
if (type.Rank == 1 && type.IsMdArray)
sb.Append('*');
sb.Append(',', type.Rank - 1);
sb.Append(']');
}
protected override void AppendNameForInstantiatedType(StringBuilder sb, DefType type)
{
AppendName(sb, type.GetTypeDefinition());
sb.Append('<');
for (int i = 0; i < type.Instantiation.Length; i++)
{
if (i > 0)
sb.Append(", ");
AppendName(sb, type.Instantiation[i]);
}
sb.Append('>');
}
protected override void AppendNameForNamespaceType(StringBuilder sb, DefType type)
{
string ns = GetTypeNamespace(type);
if (ns.Length > 0)
{
AppendEscapedIdentifier(sb, ns);
sb.Append('.');
}
AppendEscapedIdentifier(sb, GetTypeName(type));
if (type is MetadataType)
{
IAssemblyDesc homeAssembly = ((MetadataType)type).Module as IAssemblyDesc;
AppendAssemblyName(sb, homeAssembly);
}
}
private void AppendAssemblyName(StringBuilder sb, IAssemblyDesc assembly)
{
if (assembly == null)
return;
sb.Append(',');
AppendEscapedIdentifier(sb, assembly.GetName().Name);
}
protected override void AppendNameForNestedType(StringBuilder sb, DefType nestedType, DefType containingType)
{
AppendName(sb, containingType);
sb.Append('+');
string ns = GetTypeNamespace(nestedType);
if (ns.Length > 0)
{
AppendEscapedIdentifier(sb, ns);
sb.Append('.');
}
AppendEscapedIdentifier(sb, GetTypeName(nestedType));
}
private string GetTypeName(DefType type)
{
return type.Name;
}
private string GetTypeNamespace(DefType type)
{
return type.Namespace;
}
private static char[] s_escapedChars = new char[] { ',', '=', '"', ']', '[', '*', '&', '+', '\\' };
private void AppendEscapedIdentifier(StringBuilder sb, string identifier)
{
if (identifier.IndexOfAny(s_escapedChars) < 0)
{
string escapedIdentifier = identifier;
foreach (char escapedChar in s_escapedChars)
{
string escapedCharString = new string(escapedChar, 1);
escapedIdentifier = escapedIdentifier.Replace(escapedCharString, "\\" + escapedCharString);
}
sb.Append(escapedIdentifier);
}
else
{
sb.Append(identifier);
}
}
}
}
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