11// Licensed to the .NET Foundation under one or more agreements.
22// The .NET Foundation licenses this file to you under the MIT license.
33
4+ using System ;
5+ using System . Diagnostics ;
46using System . Text ;
57
68namespace Microsoft . NETCore . Platforms . BuildTasks
79{
8- internal class RID
10+ public class RID
911 {
12+ internal const char VersionDelimiter = '.' ;
13+ internal const char ArchitectureDelimiter = '-' ;
14+ internal const char QualifierDelimiter = '-' ;
15+
1016 public string BaseRID { get ; set ; }
11- public string VersionDelimiter { get ; set ; }
12- public string Version { get ; set ; }
13- public string ArchitectureDelimiter { get ; set ; }
17+ public bool OmitVersionDelimiter { get ; set ; }
18+ public RuntimeVersion Version { get ; set ; }
1419 public string Architecture { get ; set ; }
15- public string QualifierDelimiter { get ; set ; }
1620 public string Qualifier { get ; set ; }
1721
1822 public override string ToString ( )
1923 {
2024 StringBuilder builder = new StringBuilder ( BaseRID ) ;
2125
22- if ( HasVersion ( ) )
26+ if ( HasVersion )
2327 {
24- builder . Append ( VersionDelimiter ) ;
28+ if ( ! OmitVersionDelimiter )
29+ {
30+ builder . Append ( VersionDelimiter ) ;
31+ }
2532 builder . Append ( Version ) ;
2633 }
2734
28- if ( HasArchitecture ( ) )
35+ if ( HasArchitecture )
2936 {
3037 builder . Append ( ArchitectureDelimiter ) ;
3138 builder . Append ( Architecture ) ;
3239 }
3340
34- if ( HasQualifier ( ) )
41+ if ( HasQualifier )
3542 {
3643 builder . Append ( QualifierDelimiter ) ;
3744 builder . Append ( Qualifier ) ;
@@ -40,20 +47,153 @@ public override string ToString()
4047 return builder . ToString ( ) ;
4148 }
4249
43- public bool HasVersion ( )
50+ private enum RIDPart : int
51+ {
52+ Base = 0 ,
53+ Version ,
54+ Architecture ,
55+ Qualifier ,
56+ Max = Qualifier
57+ }
58+
59+ public static RID Parse ( string runtimeIdentifier )
60+ {
61+ string [ ] parts = new string [ ( int ) RIDPart . Max + 1 ] ;
62+ bool omitVersionDelimiter = true ;
63+ RIDPart parseState = RIDPart . Base ;
64+
65+ int partStart = 0 , partLength = 0 ;
66+
67+ // qualifier is indistinguishable from arch so we cannot distinguish it for parsing purposes
68+ Debug . Assert ( ArchitectureDelimiter == QualifierDelimiter ) ;
69+
70+ for ( int i = 0 ; i < runtimeIdentifier . Length ; i ++ )
71+ {
72+ char current = runtimeIdentifier [ i ] ;
73+ partLength = i - partStart ;
74+
75+ switch ( parseState )
76+ {
77+ case RIDPart . Base :
78+ // treat any number as the start of the version
79+ if ( current == VersionDelimiter || ( current >= '0' && current <= '9' ) )
80+ {
81+ SetPart ( ) ;
82+ partStart = i ;
83+ if ( current == VersionDelimiter )
84+ {
85+ omitVersionDelimiter = false ;
86+ partStart = i + 1 ;
87+ }
88+ parseState = RIDPart . Version ;
89+ }
90+ // version might be omitted
91+ else if ( current == ArchitectureDelimiter )
92+ {
93+ // ensure there's no version later in the string
94+ if ( runtimeIdentifier . IndexOf ( VersionDelimiter , i ) != - 1 )
95+ {
96+ break ;
97+ }
98+ SetPart ( ) ;
99+ partStart = i + 1 ; // skip delimiter
100+ parseState = RIDPart . Architecture ;
101+ }
102+ break ;
103+ case RIDPart . Version :
104+ if ( current == ArchitectureDelimiter )
105+ {
106+ SetPart ( ) ;
107+ partStart = i + 1 ; // skip delimiter
108+ parseState = RIDPart . Architecture ;
109+ }
110+ break ;
111+ case RIDPart . Architecture :
112+ if ( current == QualifierDelimiter )
113+ {
114+ SetPart ( ) ;
115+ partStart = i + 1 ; // skip delimiter
116+ parseState = RIDPart . Qualifier ;
117+ }
118+ break ;
119+ default :
120+ break ;
121+ }
122+ }
123+
124+ partLength = runtimeIdentifier . Length - partStart ;
125+ if ( partLength > 0 )
126+ {
127+ SetPart ( ) ;
128+ }
129+
130+ string GetPart ( RIDPart part )
131+ {
132+ return parts [ ( int ) part ] ;
133+ }
134+
135+ void SetPart ( )
136+ {
137+ if ( partLength == 0 )
138+ {
139+ throw new ArgumentException ( $ "Unexpected delimiter at position { partStart } in \" { runtimeIdentifier } \" ") ;
140+ }
141+
142+ parts [ ( int ) parseState ] = runtimeIdentifier . Substring ( partStart , partLength ) ;
143+ }
144+
145+ string version = GetPart ( RIDPart . Version ) ;
146+
147+ if ( version == null )
148+ {
149+ omitVersionDelimiter = false ;
150+ }
151+
152+ return new RID ( )
153+ {
154+ BaseRID = GetPart ( RIDPart . Base ) ,
155+ OmitVersionDelimiter = omitVersionDelimiter ,
156+ Version = version == null ? null : new RuntimeVersion ( version ) ,
157+ Architecture = GetPart ( RIDPart . Architecture ) ,
158+ Qualifier = GetPart ( RIDPart . Qualifier )
159+ } ;
160+ }
161+
162+ public bool HasVersion => Version != null ;
163+
164+ public bool HasArchitecture => Architecture != null ;
165+
166+ public bool HasQualifier => Qualifier != null ;
167+
168+ public override bool Equals ( object obj )
44169 {
45- return Version != null ;
170+ return Equals ( obj as RID ) ;
46171 }
47172
48- public bool HasArchitecture ( )
173+ public bool Equals ( RID obj )
49174 {
50- return Architecture != null ;
175+ return object . ReferenceEquals ( obj , this ) ||
176+ ( obj is not null &&
177+ BaseRID == obj . BaseRID &&
178+ ( Version == null || OmitVersionDelimiter == obj . OmitVersionDelimiter ) &&
179+ Version == obj . Version &&
180+ Architecture == obj . Architecture &&
181+ Qualifier == obj . Qualifier ) ;
182+
51183 }
52184
53- public bool HasQualifier ( )
185+ public override int GetHashCode ( )
54186 {
55- return Qualifier != null ;
187+ #if NETFRAMEWORK
188+ return BaseRID . GetHashCode ( ) ;
189+ #else
190+ HashCode hashCode = default ;
191+ hashCode . Add ( BaseRID ) ;
192+ hashCode . Add ( Version ) ;
193+ hashCode . Add ( Architecture ) ;
194+ hashCode . Add ( Qualifier ) ;
195+ return hashCode . ToHashCode ( ) ;
196+ #endif
56197 }
57198 }
58-
59199}
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