111 lines
3.2 KiB
C#
111 lines
3.2 KiB
C#
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/*
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Copyright (C) 2014-2019 de4dot@gmail.com
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This file is part of dnSpy
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dnSpy is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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dnSpy is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with dnSpy. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.ComponentModel;
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using System.Reflection;
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namespace dnSpy.Contracts.Images {
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/// <summary>
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/// Image reference
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/// </summary>
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[TypeConverter(typeof(ImageReferenceConverter))]
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public readonly struct ImageReference {
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/// <summary>
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/// Gets an <see cref="ImageReference"/> which isn't referencing any image
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/// </summary>
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public static readonly ImageReference None = default;
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/// <summary>
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/// true if it's the default instance
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/// </summary>
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public bool IsDefault => Assembly is null && Name is null;
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/// <summary>
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/// Assembly of image or null if <see cref="Name"/> is a URI
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/// </summary>
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public Assembly? Assembly { get; }
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/// <summary>
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/// Name of image
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/// </summary>
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public string Name { get; }
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/// <summary>
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/// Constructor
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/// </summary>
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/// <param name="assembly">Assembly of image or null if <paramref name="name"/> is a pack: URI</param>
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/// <param name="name">Name of image</param>
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public ImageReference(Assembly? assembly, string name) {
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Assembly = assembly;
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Name = name ?? throw new ArgumentNullException(nameof(name));
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}
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/// <summary>
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/// Parses a string and tries to create an <see cref="ImageReference"/>
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/// </summary>
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/// <param name="value">String to parse</param>
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/// <param name="result">Result</param>
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/// <returns></returns>
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public static bool TryParse(string? value, out ImageReference result) {
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result = default;
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if (value is null)
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return false;
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if (value == string.Empty)
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return true;
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if (value.StartsWith("/", StringComparison.OrdinalIgnoreCase) ||
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value.StartsWith("pack:", StringComparison.OrdinalIgnoreCase) ||
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value.StartsWith("file:", StringComparison.OrdinalIgnoreCase)) {
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result = new ImageReference(null, value);
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return true;
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}
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int index = value.IndexOf(',');
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if (index < 0) {
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result = new ImageReference(null, value);
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return true;
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}
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var asmName = value.Substring(0, index).Trim();
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var name = value.Substring(index + 1).Trim();
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Assembly asm;
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try {
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asm = Assembly.Load(asmName);
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}
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catch {
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return false;
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}
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result = new ImageReference(asm, name);
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return true;
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}
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/// <summary>
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/// Converts this instance to a string that can be passed to <see cref="TryParse(string, out ImageReference)"/>
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/// </summary>
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/// <returns></returns>
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public override string ToString() {
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if (IsDefault)
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return string.Empty;
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if (Assembly is null)
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return Name;
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return Assembly.GetName().Name + "," + Name;
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}
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}
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}
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