.net 使用Superpower解析列表列表

我想解析以如下格式表示的图书馆书籍：

#Book title 1
Chapter 1
Chapter 2
#Book title 2
Chapter 1
Chapter 2
Chapter 3

正如您所看到的，《靴子》的标题前面有一行，每本书的章节如下。为此创建解析器应该相当容易

到目前为止，我有以下代码解析器+标记器：

void Main()
{
    var tokenizer = new TokenizerBuilder<PrjToken>()
                    .Match(Superpower.Parsers.Character.EqualTo('#'), PrjToken.Hash)
                    .Match(Span.Regex("[^\r\n#:=-]*"), PrjToken.Text)
                    .Match(Span.WhiteSpace, PrjToken.WhiteSpace)
                    .Build();


    var input = @"#Book 1
Chapter 1
Chapter 2
#Book 2
Chapter 1
Chapter 2
Chapter 3";

    var library = MyParsers.Library.Parse(tokenizer.Tokenize(input));
}


public enum PrjToken
{
    WhiteSpace,
    Hash,
    Text
}


public class Book
{
    public string Title { get; }
    public string[] Chapters { get; }

    public Book(string title, string[] chapters)
    {
        Title = title;
        Chapters = chapters;
    }
}

public class Library
{
    public Book[] Books { get; }

    public Library(Book[] books)
    {
        Books = books;
    }
}


public class MyParsers
{
    public static readonly TokenListParser<PrjToken, string> Text = from text in Token.EqualTo(PrjToken.Text)
                                                                    select text.ToStringValue();

    public static readonly TokenListParser<PrjToken, Superpower.Model.Token<PrjToken>> Whitespace = from text in Token.EqualTo(PrjToken.WhiteSpace)
                                                                                   select text;

    public static readonly TokenListParser<PrjToken, string> Title =
        from hash in Token.EqualTo(PrjToken.Hash)
        from text in Text
        from wh in Whitespace
        select text;

    public static readonly TokenListParser<PrjToken, Book> Book =
        from title in Title
        from chapters in Text.ManyDelimitedBy(Whitespace)
        select new Book(title, chapters);

    public static readonly TokenListParser<PrjToken, Library> Library =
        from books in Book.ManyDelimitedBy(Whitespace)
        select new Library(books);
}

上面的代码已准备好在.NET FIDLE中运行此链接

一切看起来都很好。但是，解析器有问题，因为我遇到了以下错误：

语法错误第4行第1列：意外哈希，预期文本

---

我的解析器出了什么问题？

您可以通过将章节解析为一个单独的列表来解决这个问题，其中每个章节都以空格字符结尾：

    public static readonly TokenListParser<PrjToken, string> Chapter =
        from chapterName in Text
        from wh in Whitespace
        select chapterName;

    public static readonly TokenListParser<PrjToken, Book> Book =
        from title in Title
        from chapters in Chapter.Many()
        select new Book(title, chapters);

除此之外，如果希望解析文件时不在文件末尾添加换行符，还必须将章节末尾的空白设置为可选：

    public static readonly TokenListParser<PrjToken, string> Chapter =
        from chapterName in Text
        from wh in Whitespace.Optional()
        select chapterName;

最后，我们得到了完整的解析器：

public class MyParsers
{
    public static readonly TokenListParser<PrjToken, string> Text = from text in Token.EqualTo(PrjToken.Text)
        select text.ToStringValue();

    public static readonly TokenListParser<PrjToken, Superpower.Model.Token<PrjToken>> Whitespace = from text in Token.EqualTo(PrjToken.WhiteSpace)
        select text;

    public static readonly TokenListParser<PrjToken, string> Title =
        from hash in Token.EqualTo(PrjToken.Hash)
        from text in Text
        from wh in Whitespace
        select text;

    public static readonly TokenListParser<PrjToken, string> Chapter =
        from chapterName in Text
        from wh in Whitespace.Optional()
        select chapterName;

    public static readonly TokenListParser<PrjToken, Book> Book =
        from title in Title
        from chapters in Chapter.Many()
        select new Book(title, chapters);

    public static readonly TokenListParser<PrjToken, Library> Library =
        from books in Book.Many()
        select new Library(books);
}

---

我已经根据你的建议修改了代码，但它只解析了第一本书。请你复习一下好吗？提前谢谢！这是修改后的版本：请检查输出。它只解析第一本书：

public class MyParsers
{
    public static readonly TokenListParser<PrjToken, string> Text = from text in Token.EqualTo(PrjToken.Text)
        select text.ToStringValue();

    public static readonly TokenListParser<PrjToken, Superpower.Model.Token<PrjToken>> Whitespace = from text in Token.EqualTo(PrjToken.WhiteSpace)
        select text;

    public static readonly TokenListParser<PrjToken, string> Title =
        from hash in Token.EqualTo(PrjToken.Hash)
        from text in Text
        from wh in Whitespace
        select text;

    public static readonly TokenListParser<PrjToken, string> Chapter =
        from chapterName in Text
        from wh in Whitespace.Optional()
        select chapterName;

    public static readonly TokenListParser<PrjToken, Book> Book =
        from title in Title
        from chapters in Chapter.Many()
        select new Book(title, chapters);

    public static readonly TokenListParser<PrjToken, Library> Library =
        from books in Book.Many()
        select new Library(books);
}