feat: CanonSharp Benchmark. (#4)

Reviewed-on: https://git.bupt-hpc.cn/jackfiled/CanonSharp/pulls/4
Co-authored-by: jackfiled <xcrenchangjun@outlook.com>
Co-committed-by: jackfiled <xcrenchangjun@outlook.com>

CanonSharp.Benchmark/Benchmarks/GrammarParserBenchmark.cs

@@ -0,0 +1,73 @@
+using BenchmarkDotNet.Attributes;
+using CanonSharp.Benchmark.Canon.Core;
+using CanonSharp.Benchmark.Canon.Core.Abstractions;
+using CanonSharp.Benchmark.Canon.Core.GrammarParser;
+using CanonSharp.Benchmark.Canon.Core.LexicalParser;
+using CanonSharp.Benchmark.Canon.Core.SyntaxNodes;
+using CanonSharp.Pascal.Parser;
+using CanonSharp.Pascal.Scanner;
+
+namespace CanonSharp.Benchmark.Benchmarks;
+
+public class GrammarParserBenchmark
+{
+    private readonly List<string> _inputFiles = [];
+
+    // CanonSharp
+    private readonly LexicalScanner _scanner = new();
+    private readonly GrammarParser _parser = new();
+
+    // Canon
+    private readonly IGrammarParser _grammarParser = GeneratedGrammarParser.Instance;
+
+    public GrammarParserBenchmark()
+    {
+        _inputFiles.AddRange(ReadOpenSet());
+    }
+
+    [Benchmark]
+    [ArgumentsSource(nameof(InputFiles))]
+    public Pascal.SyntaxTree.Program CanonSharpParse(int index)
+    {
+        IEnumerable<LexicalToken> tokens = _scanner.Tokenize(new StringReadState(_inputFiles[index]));
+        return _parser.Parse(tokens);
+    }
+
+    [Benchmark]
+    [ArgumentsSource(nameof(InputFiles))]
+    public ProgramStruct CanonParse(int index)
+    {
+        Lexer lexer = new();
+        IEnumerable<SemanticToken> tokens = lexer.Tokenize(new StringSourceReader(_inputFiles[index]));
+
+        return _grammarParser.Analyse(tokens);
+    }
+
+    public IEnumerable<object> InputFiles()
+    {
+        for (int i = 0; i < _inputFiles.Count; i++)
+        {
+            yield return i;
+        }
+    }
+
+    private static List<string> ReadOpenSet()
+    {
+        DirectoryInfo baseDirectory = new("/home/ricardo/Documents/Code/CSharp/CanonSharp/OpenSet");
+        if (!baseDirectory.Exists)
+        {
+            throw new InvalidOperationException("Can't find 'OpenSet' directory.");
+        }
+
+        List<string> result = [];
+
+        foreach (FileInfo file in baseDirectory.EnumerateFiles())
+        {
+            using StreamReader reader = file.OpenText();
+
+            result.Add(reader.ReadToEnd());
+        }
+
+        return result;
+    }
+}