120 строки
3.0 KiB
C#
120 строки
3.0 KiB
C#
using System;
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using System.Diagnostics.CodeAnalysis;
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using System.Runtime.Versioning;
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using Xamarin.Utils;
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#nullable enable
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namespace Xamarin.Utils {
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internal static class OSPlatformAttributeExtensions {
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#if NET
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public static bool TryParse (string? platformName, [NotNullWhen (true)] out string? platform, out Version? version)
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#else
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public static bool TryParse (string? platformName, out string? platform, out Version? version)
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#endif
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{
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platform = null;
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version = null;
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if (string.IsNullOrEmpty (platformName))
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return false;
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var versionIndex = -1;
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#if NET
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for (var i = 0; i < platformName.Length; i++) {
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#else
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for (var i = 0; i < platformName!.Length; i++) {
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#endif
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if (platformName [i] >= '0' && platformName [i] <= '9') {
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versionIndex = i;
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break;
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}
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}
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string supportedPlatform;
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string? supportedVersion = null;
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if (versionIndex == -1) {
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supportedPlatform = platformName;
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} else {
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supportedPlatform = platformName.Substring (0, versionIndex);
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supportedVersion = platformName.Substring (versionIndex);
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}
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platform = supportedPlatform.ToLowerInvariant ();
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if (string.IsNullOrEmpty (supportedVersion))
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return true;
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return Version.TryParse (supportedVersion, out version);
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}
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#if NET
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public static bool TryParse (string? platformName, [NotNullWhen (true)] out ApplePlatform? platform, out Version? version)
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#else
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public static bool TryParse (string? platformName, out ApplePlatform? platform, out Version? version)
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#endif
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{
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platform = null;
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if (!TryParse (platformName, out string? supportedPlatform, out version))
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return false;
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#if NET
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return TryGetApplePlatform (supportedPlatform, out platform);
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#else
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return TryGetApplePlatform (supportedPlatform!, out platform);
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#endif
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}
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#if NET
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public static bool TryParse (this OSPlatformAttribute self, [NotNullWhen (true)] out string? platform, out Version? version)
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{
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if (self is null)
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throw new ArgumentNullException (nameof (self));
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return TryParse (self.PlatformName, out platform, out version);
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}
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public static bool TryParse (this OSPlatformAttribute self, [NotNullWhen (true)] out ApplePlatform? platform, out Version? version)
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{
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platform = null;
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if (!TryParse (self, out string? supportedPlatform, out version))
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return false;
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return TryGetApplePlatform (supportedPlatform, out platform);
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}
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#endif
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#if NET
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static bool TryGetApplePlatform (string supportedPlatform, [NotNullWhen (true)] out ApplePlatform? platform)
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#else
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static bool TryGetApplePlatform (string supportedPlatform, out ApplePlatform? platform)
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#endif
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{
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switch (supportedPlatform) {
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case "ios":
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platform = ApplePlatform.iOS;
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break;
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case "tvos":
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platform = ApplePlatform.TVOS;
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break;
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case "macos":
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platform = ApplePlatform.MacOSX;
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break;
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case "maccatalyst":
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platform = ApplePlatform.MacCatalyst;
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break;
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case "watchos":
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platform = ApplePlatform.WatchOS;
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break;
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default:
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platform = null;
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return false;
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}
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return true;
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}
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}
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}
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