feat: 完善编译器命令行功能 (#43)

Reviewed-on: PostGuard/Canon#43

Canon.Console/Extensions/RootCommandExtensions.cs

@@ -0,0 +1,48 @@
+using System.CommandLine;
+using Canon.Console.Models;
+using Canon.Console.Services;
+using Canon.Core.Abstractions;
+using Canon.Core.LexicalParser;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace Canon.Console.Extensions;
+
+public static class RootCommandExtensions
+{
+    public static void SetCompile(this RootCommand rootCommand)
+    {
+        Option<string> sourceFilenameOption = new("--input", "The source pascal filename")
+        {
+            IsRequired = true
+        };
+        sourceFilenameOption.AddAlias("-i");
+
+        rootCommand.AddOption(sourceFilenameOption);
+
+        rootCommand.SetHandler(async (context) =>
+        {
+            string? sourceFilename = context.ParseResult.GetValueForOption(sourceFilenameOption);
+            if (sourceFilename is null)
+            {
+                System.Console.WriteLine("Error: please provide source filename with option '-i'.");
+                return;
+            }
+
+            HostApplicationBuilder builder = Host.CreateApplicationBuilder();
+
+            builder.Logging.ClearProviders();
+            builder.Logging.Services.AddSingleton<ILoggerProvider, CompilerLoggerProvider>();
+
+            builder.Services.AddSingleton<CompilerOption>(
+                _ => new CompilerOption { SourceFilename = sourceFilename });
+            builder.Services.AddTransient<ILexer, Lexer>();
+            builder.Services.AddSingleton<IGrammarParser>(_ => GeneratedGrammarParser.Instance);
+            builder.Services.AddHostedService<Compiler>();
+
+            using IHost host = builder.Build();
+            await host.RunAsync();
+        });
+    }
+}