Replace all raw string comparisons with StringKey, source generator that creates cache keys for all names for Gen7 plugin

Plugins/PkmnLib.Plugin.Gen7.SourceGen/DataConstantsGenerator.cs

@@ -0,0 +1,59 @@
+using Microsoft.CodeAnalysis;
+using PkmnLib.Plugin.Gen7.SourceGen.Emit;
+using PkmnLib.Plugin.Gen7.SourceGen.Parsing;
+
+namespace PkmnLib.Plugin.Gen7.SourceGen;
+
+/// <summary>
+/// Generates <c>public static readonly StringKey</c> constant classes (move names, type names,
+/// move flags, etc.) from the Gen 7 data files, which are exposed to the generator as
+/// <c>AdditionalFiles</c>.
+/// </summary>
+[Generator]
+public sealed class DataConstantsGenerator : IIncrementalGenerator
+{
+    private static readonly DiagnosticDescriptor ParseFailure = new("PKMN7G000", "Data file parse failure", "{0}",
+        "PkmnLib.SourceGen", DiagnosticSeverity.Error, true);
+
+    private static readonly DiagnosticDescriptor DuplicateIdentifier = new("PKMN7G001", "Duplicate constant identifier",
+        "{0}", "PkmnLib.SourceGen", DiagnosticSeverity.Error, true);
+
+    private static readonly DiagnosticDescriptor UnusableName = new("PKMN7G002", "Unusable constant name", "{0}",
+        "PkmnLib.SourceGen", DiagnosticSeverity.Error, true);
+
+    public void Initialize(IncrementalGeneratorInitializationContext context)
+    {
+        var results = context.AdditionalTextsProvider
+            .Where(static text => DataExtractor.IsKnownFile(Path.GetFileName(text.Path))).Select(static (text, ct) =>
+                DataExtractor.Extract(Path.GetFileName(text.Path), text.GetText(ct)?.ToString()));
+
+        context.RegisterSourceOutput(results, static (context, result) =>
+        {
+            foreach (var diagnostic in result.Diagnostics)
+            {
+                Report(context, diagnostic);
+            }
+            foreach (var spec in result.Classes)
+            {
+                var diagnostics = new List<ExtractionDiagnostic>();
+                var source = ConstantClassEmitter.Emit(spec, diagnostics);
+                foreach (var diagnostic in diagnostics)
+                {
+                    Report(context, diagnostic);
+                }
+                context.AddSource($"{spec.ClassName}.g.cs", source);
+            }
+        });
+    }
+
+    private static void Report(SourceProductionContext context, ExtractionDiagnostic diagnostic)
+    {
+        var descriptor = diagnostic.Id switch
+        {
+            "PKMN7G001" => DuplicateIdentifier,
+            "PKMN7G002" => UnusableName,
+            _ => ParseFailure,
+        };
+        context.ReportDiagnostic(Diagnostic.Create(descriptor, Location.None, diagnostic.Message));
+    }
+}