refact: 将编译中各个阶段接口化 (#35)

Reviewed-on: PostGuard/Canon#35

Canon.Tests/CCodeGeneratorTests/BasicTests.cs

@@ -0,0 +1,33 @@
+using Canon.Core.Abstractions;
+using Canon.Core.CodeGenerators;
+using Canon.Core.LexicalParser;
+using Canon.Core.SyntaxNodes;
+using Canon.Tests.GeneratedParserTests;
+
+namespace Canon.Tests.CCodeGeneratorTests;
+
+public class BasicTests
+{
+    private readonly IGrammarParser _parser = GeneratedGrammarParser.Instance;
+
+    [Fact]
+    public void ProgramStructTest()
+    {
+        CCodeBuilder builder = new();
+
+        const string program = """
+                               program DoNothing;
+                               begin
+                               end.
+                               """;
+
+        Lexer lexer = new(program);
+        List<SemanticToken> tokens = lexer.Tokenize();
+        tokens.Add(SemanticToken.End);
+
+        ProgramStruct root = _parser.Analyse(tokens);
+        root.GenerateCCode(builder);
+
+        Assert.Equal("#include <PascalCoreLib.h>", builder.Build());
+    }
+}