C# Scanner类代码示例

        public void ReadInvalidRepeatedTagDirective()
        {
            using (var reader = new StreamReader(string.Format("TestData{0}example-6.17_invalid-repeated-tag-directive.yml", Path.DirectorySeparatorChar)))
            {
                var scanner = new Scanner(reader);
                var tokens = scanner.ReadTokens().ToList();

                Assert.That(tokens.Count, Is.EqualTo(9));

                var directiveTokens = tokens.FindAll(t => t is DirectiveToken).Select(t => t as DirectiveToken).ToList();
                Assert.AreEqual(2, directiveTokens.Count);

                Assert.IsNotNull(directiveTokens[0]);
                Assert.That(directiveTokens[0].Name, Is.EqualTo("TAG"));

                Assert.IsNotNull(directiveTokens[1]);
                Assert.That(directiveTokens[1].Name, Is.EqualTo("TAG"));

                var directiveParameters0 = directiveTokens[0].Parameters.ToList();
                Assert.That(directiveParameters0.Count, Is.EqualTo(2));
                Assert.That(directiveParameters0[0], Is.EqualTo("!"));
                Assert.That(directiveParameters0[1], Is.EqualTo("!foo"));

                var directiveParameters1 = directiveTokens[1].Parameters.ToList();
                Assert.That(directiveParameters1.Count, Is.EqualTo(2));
                Assert.That(directiveParameters1[0], Is.EqualTo("!"));
                Assert.That(directiveParameters1[1], Is.EqualTo("!foo"));

                var documentContentToken = tokens.Find(t => t is DocumentContentToken) as DocumentContentToken;

                Assert.IsNotNull(documentContentToken);
                Assert.AreEqual("bar", documentContentToken.Content.TrimEnd());
            }
        }

 public static IEnumerable<Token> Scan(string source)
 {
     var se = new SymbolsEnumerator(source);
     var result = new Scanner(se).Scan();
     se.Dispose();
     return result;
 }

    void Run()
    {
        Scanner input = new Scanner(Console.In);

        long A = input.NextInt();
        long B = input.NextInt();
        int N = input.NextInt();

        Bignum a = new Bignum(0);
        Bignum b = new Bignum(0);
        Bignum one = new Bignum(1);

        int last = 0;
        for (int i = 0; i < N; i++) {
            while (A % 2 == 0 && B % 2 == 0) { A /= 2; B /= 2; }

            if (A > B || (A == B && last == 0)) {
                B *= 2;
                last = 0;
                a.Add(a);
                a.Add(one);
            } else {
                A *= 2;
                last = 1;
                b.Add(b);
                b.Add(one);
            }
        }

        a.Add(b);
        Console.WriteLine(a);
    }

    void Run()
    {
        Scanner input = new Scanner(Console.In);

        string[] a = new string[3];
        for (int i = 0; i < 3; i++)
            a[i] = input.Next();

        int max = 0, min = 0, max_c = 1;
        for (int i = 1; i < 3; i++) {
            if (a[i].Length > a[max].Length ||
                (a[i].Length == a[max].Length && a[i].CompareTo(a[max]) > 0)) {
                max = i;
                max_c = 1;
            } else if (a[i] == a[max]) {
                max_c++;
            } else {
                min = i;
            }
        }

        string[] names = new string[] { "Mary", "Klaus", "Peter" };

        if (max_c == 1)
            Console.WriteLine(names[max]);
        else if (max_c == 2)
            Console.WriteLine(names[min]);
        else
            Console.WriteLine("Draw");
    }

    void Run()
    {
        Scanner input = new Scanner(Console.In);

        long R = input.NextInt();
        long xc = input.NextInt();
        long yc = input.NextInt();
        long x = input.NextInt() - xc;
        long y = input.NextInt() - yc;
        long dx = input.NextInt() - xc - x;
        long dy = input.NextInt() - yc - y;

        long a = dx * dx + dy * dy;
        long b = 2 * x * dx + 2 * y * dy;
        long c = x * x + y * y - R * R;
        long det = b * b - 4 * a * c;

        if (det == 0)
            Console.WriteLine("0");
        else if (det < 0)
            Console.WriteLine("-1");
        else {
            double res = Math.Sqrt(det) / a * Math.Sqrt(dx * dx + dy * dy);
            Console.WriteLine("{0:0.00000000}", res);
        }
    }

 public void Keywords(string keyword)
 {
     var lexer = new Scanner(keyword);
     Token next = lexer.NextToken();
     Assert.That(next, Is.InstanceOf<KeywordToken>());
     Assert.That(((KeywordToken)next).Value, Is.EqualTo(keyword));
 }

 public void test_lex()
 {
     Scanner lex = new Scanner();
     lex.src = "int main() { return 0; }";
     lex.Lex();
     String output = lex.ToString();
 }

        public override Microsoft.VisualStudio.Package.AuthoringScope ParseSource(ParseRequest req)
        {
            Babel.Source source = (Babel.Source)this.GetSource(req.FileName);
            bool yyparseResult = false;

            // req.DirtySpan seems to be set even though no changes have occurred
            // source.IsDirty also behaves strangely
            // might be possible to use source.ChangeCount to sync instead

            if (req.DirtySpan.iStartIndex != req.DirtySpan.iEndIndex
                || req.DirtySpan.iStartLine != req.DirtySpan.iEndLine) {
                ErrorHandler handler = new ErrorHandler();
                Scanner scanner = new Scanner(); // string interface
                Parser parser = new Parser();  // use noarg constructor
                parser.scanner = scanner;
                scanner.Handler = handler;
                parser.SetHandler(handler);
                scanner.SetSource(req.Text, 0);

                parser.MBWInit(req);
                yyparseResult = parser.Parse();

                // store the parse results
                // source.ParseResult = aast;
                source.ParseResult = null;
                source.Braces = parser.Braces;

                // for the time being, just pull errors back from the error handler
                if (handler.ErrNum > 0) {
                    foreach (Babel.Parser.Error error in handler.SortedErrorList()) {
                        TextSpan span = new TextSpan();
                        span.iStartLine = span.iEndLine = error.line - 1;
                        span.iStartIndex = error.column;
                        span.iEndIndex = error.column + error.length;
                        req.Sink.AddError(req.FileName, error.message, span, Severity.Error);
                    }
                }
            }
            switch (req.Reason) {
                case ParseReason.Check:
                case ParseReason.HighlightBraces:
                case ParseReason.MatchBraces:
                case ParseReason.MemberSelectAndHighlightBraces:
                    // send matches to sink
                    // this should (probably?) be filtered on req.Line / col
                    if (source.Braces != null) {
                        foreach (TextSpan[] brace in source.Braces) {
                            if (brace.Length == 2)
                                req.Sink.MatchPair(brace[0], brace[1], 1);
                            else if (brace.Length >= 3)
                                req.Sink.MatchTriple(brace[0], brace[1], brace[2], 1);
                        }
                    }
                    break;
                default:
                    break;
            }

            return new AuthoringScope(req.Text);
        }

 public Parser(string exp, ICalcFunction calcFunc)
 {
     this.exp = exp;
     tree = null;
     scanner = new Scanner(exp);
     this.icalcfunc = calcFunc;
 }

    void Run()
    {
        Scanner input = new Scanner(Console.In);

        N = input.NextInt();

        value = new int[N + 1];
        for (int i = 1; i <= N; i++)
            value[i] = input.NextInt();

        kid = new int[N + 1];
        sib = new int[N + 1];
        parent = new int[N + 1];

        for (int i = 1; i < N; i++) {
            int x = input.NextInt();
            int p = input.NextInt();
            sib[x] = kid[p];
            kid[p] = x;
            parent[x] = p;
        }

        int root = 0;
        for (int i = 1; i <= N; i++)
            if (parent[i] == 0) root = i;

        memo = new int[N + 1, 2];
        got = new bool[N + 1, 2];

        int res = Math.Max(vertCov(root, 0), vertCov(root, 1));
        Console.WriteLine(res);
    }

        public void ReadBareDocuments()
        {
            using (var reader = new StreamReader(Path.Combine("TestData", "example-9.3_bare-documents.yml")))
            {
                var scanner = new Scanner(reader);
                var tokens = scanner.ReadTokens().ToList();

                Assert.That(tokens.Count, Is.EqualTo(12));
                Assert.That(tokens[0], Is.InstanceOf(typeof(StreamStartToken)));
                Assert.That(tokens[1], Is.InstanceOf(typeof(DirectivesStartToken)));
                Assert.That(tokens[2], Is.InstanceOf(typeof(DirectivesEndToken)));
                Assert.That(tokens[3], Is.InstanceOf(typeof(DocumentStartToken)));
                Assert.That(tokens[4], Is.InstanceOf(typeof(DocumentContentToken)));
                Assert.That(tokens[5], Is.InstanceOf(typeof(DocumentEndToken)));
                Assert.That(tokens[6], Is.InstanceOf(typeof(DirectivesStartToken)));
                Assert.That(tokens[7], Is.InstanceOf(typeof(DirectivesEndToken)));
                Assert.That(tokens[8], Is.InstanceOf(typeof(DocumentStartToken)));
                Assert.That(tokens[9], Is.InstanceOf(typeof(DocumentContentToken)));
                Assert.That(tokens[10], Is.InstanceOf(typeof(DocumentEndToken)));
                Assert.That(tokens[11], Is.InstanceOf(typeof(StreamEndToken)));

                Assert.That(((DocumentContentToken)tokens[4]).Content, Is.Not.Empty);
                Assert.That(((DocumentContentToken)tokens[9]).Content, Is.Not.Empty);
            }
        }

        public override object Evaluate(Frame environment)
        {
            if (environment == null)
            {
                throw new ArgumentNullException("Environment can not be null.");
            }
            string path = environment.FindBindingValue(Parameters[0]).ToString();
            if (!File.Exists(path))
            {
                throw new Exception("Could not find file: " + path);
            }

            using (StreamReader codeReader = new StreamReader(File.Open(path, FileMode.Open)))
            {
                Scanner scanner = new Scanner(codeReader);

                Expression expr = scanner.NextExpression;
                string evaluation = string.Empty;
                while (expr != null)
                {
                    evaluation = environment.Evaluate(expr).ToString();
                    expr = scanner.NextExpression;
                }

                return evaluation;
            }
        }

 // constructs a parser for a string in memory (used for test purposes)
 // ts is the string to be parsed, source is a name to be used as the
 // filename in any error messages.
 public Parser( string source, string ts )
 {
     this.filename = source;
     sc = new Scanner(source, ts);
     DeclaredFunctionList = new List<Function>();
     UsedFunctions = new List<Function>();
 }

 private void button2_Click(object sender, EventArgs e)
 {
     label2.ForeColor = Color.Cyan;
     label2.Text = "Being Compiled.";
     try
     {
         Scanner scanner = null;
         using (TextReader input = File.OpenText(openFileDialog1.FileName))
         {
             scanner = new Scanner(input);
         }
         Parser parser = new Parser(scanner.Tokens);
         CodeGen codeGen = new CodeGen(parser.Result, Path.GetFileNameWithoutExtension(openFileDialog1.FileName) + ".exe");
         label2.ForeColor = Color.Lime;
         label2.Text = "Compiled! Check the directory this program is in, or click 'Test File' and check the console.";
         button3.Enabled = true;
     }
     catch (Exception ex)
     {
         textBox3.Show();
         textBox3.Text = ex.Message;
         label2.ForeColor = Color.Red;
         label2.Text = "Error!";
         button3.Enabled = false;
     }
 }

        public static void Main(string[] arg)
        {
            if (arg.Length == 2)
            {
              Scanner scanner = new Scanner(arg[0]);
              Parser parser = new Parser(scanner);
              parser.Parse();
              if (parser.errors.count != 0)
              {
            Console.WriteLine("*** " + parser.errors.count + " Parsing errors ***");
            return;
              }

              parser.Write("output.ir");

              IRStream tuples = parser.GetStream();

              // Code Optimizations - 100% doesn't work yet
              // tuples = SSA.DoSSAOptimizations(tuples);

              // Register Allocation
              List<IRTuple> tuples_out = Allocate.run(tuples);

              // backenders should write ARM out to arg[1]
              CodeGen.IRListToArmFile(tuples_out, arg[1]);
              Console.Write("\n");
            }
            else Console.WriteLine("Usage: tcdscc <program.swift> <output.asm>");
        }