截断Markdown吗? [英] Truncate Markdown?

问题描述

我有一个Rails网站，其中的内容以markdown编写.我希望显示每一个的片段，并带有阅读更多.."链接.

I have a Rails site, where the content is written in markdown. I wish to display a snippet of each, with a "Read more.." link.

我该如何处理?例如，简单截断原始文本将不起作用.

How do I go about this? Simple truncating the raw text will not work, for example..

>> "This is an [example](http://example.com)"[0..25]
=> "This is an [example](http:"

理想情况下，我想允许作者(可选)插入一个标记以指定用作代码段"的内容，如果不行，则需要250个单词，并附加"..."，例如..

Ideally I want to allow the author to (optionally) insert a marker to specify what to use as the "snippet", if not it would take 250 words, and append "..." - for example..

This article is an example of something or other.

This segment will be used as the snippet on the index page.

^^^^^^^^^^^^^^^

This text will be visible once clicking the "Read more.." link

可以将标记视为EOF标记(显示完整文档时可以将其忽略)

The marker could be thought of like an EOF marker (which can be ignored when displaying the full document)

我正在使用 maruku 进行Markdown处理(RedCloth非常偏向于Textile，BlueCloth非常容易出错，而且我想要一个本机Ruby解析器，该解析器可以将peg-markdown和RDiscount排除在外)

I am using maruku for the Markdown processing (RedCloth is very biased towards Textile, BlueCloth is extremely buggy, and I wanted a native-Ruby parser which ruled out peg-markdown and RDiscount)

或者(因为Markdown仍然被翻译成HTML)，正确地截断HTML是一种选择-尽管最好不要markdown()整个文档，而只是获得前几行.

Alternatively (since the Markdown is translated to HTML anyway) truncating the HTML correctly would be an option - although it would be preferable to not markdown() the entire document, just to get the first few lines.

所以，我能想到的选项是(按优先顺序排列.)

So, the options I can think of are (in order of preference)..

• 在maruku解析器中添加截断"选项，该选项将仅解析前x个字，或直到摘录"标记.
• 编写/查找与解析器无关的Markdown truncate'r
• 编写/查找智能HTML截断功能

推荐答案

• 编写/查找智能HTML截断功能

• Write/find an intelligent HTML truncating function

http://mikeburnscoder.wordpress中的以下内容. com/2006/11/11/truncating-html-in-ruby/，并进行了一些修改将正确截断HTML，并轻松地允许在结束标记之前添加字符串.

The following from http://mikeburnscoder.wordpress.com/2006/11/11/truncating-html-in-ruby/, with some modifications will correctly truncate HTML, and easily allow appending a string before the closing tags.

>> puts "<p><b><a href=\"hi\">Something</a></p>".truncate_html(5, at_end = "...")
=> <p><b><a href="hi">Someth...</a></b></p>

修改后的代码:

require 'rexml/parsers/pullparser'

class String
  def truncate_html(len = 30, at_end = nil)
    p = REXML::Parsers::PullParser.new(self)
    tags = []
    new_len = len
    results = ''
    while p.has_next? && new_len > 0
      p_e = p.pull
      case p_e.event_type
      when :start_element
        tags.push p_e[0]
        results << "<#{tags.last}#{attrs_to_s(p_e[1])}>"
      when :end_element
        results << "</#{tags.pop}>"
      when :text
        results << p_e[0][0..new_len]
        new_len -= p_e[0].length
      else
        results << "<!-- #{p_e.inspect} -->"
      end
    end
    if at_end
      results << "..."
    end
    tags.reverse.each do |tag|
      results << "</#{tag}>"
    end
    results
  end

  private

  def attrs_to_s(attrs)
    if attrs.empty?
      ''
    else
      ' ' + attrs.to_a.map { |attr| %{#{attr[0]}="#{attr[1]}"} }.join(' ')
    end
  end
end

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