如何将字符串读入Ruby字典？

我现在想用Jekyll博客取代我的Wordpress博客。为此，我必须找到WordPress标题标签的替代品：

[caption id="attachment_76716" align="aligncenter" width="500"]<a href="http://martin-thoma.com/wp-content/uploads/2013/11/WER-calculation.png"><img src="http://martin-thoma.com/wp-content/uploads/2013/11/WER-calculation.png" alt="WER calculation" width="500" height="494" class="size-full wp-image-76716" /></a> WER calculation[/caption]

而它应该被渲染到：

<div style="width: 510px" class="wp-caption aligncenter">
    <a href="../images/2013/11/WER-calculation.png">
        <img src="../images/2013/11/WER-calculation.png" alt="WER calculation" width="500" height="494" class="size-full">
    </a>
    <p class="wp-caption-text">WER calculation</p>
</div>

进入ruby字典（它们似乎被称为“Hash”？）

这是我的插件：

# Title: Caption tag
# Author: Martin Thoma, http://martin-thoma.com

module Jekyll
  class CaptionTag < Liquid::Tag

    def initialize(tag_name, text, tokens)
      super
      @text = text
      @tokens = tokens
    end

    def render(context)
        @hash = Hash.new
        @array = @text.split(" ")
        @array.each do |element|
            key, value = element.split("=")
            @hash[key] = value
        end
        #"#{@text} #{@tokens}"
        "<div style=\"width: #{@hash['width']}px\" class=\"#{@hash['alignment']}\">" +
        "<a href=\"../images/#{@hash['url']}\">" +
            "<img src=\"../images/#{@hash['url']}\" alt=\"#{@hash['text']}\" width=\"#{@hash['width']}\" height=\"#{@hash['height']}\" class=\"#{@hash['class']}\">" +
        "</a>" +
        "<p class=\"wp-caption-text\">#{@hash['text']}</p>" +
        "</div>"
    end
  end
end

Liquid::Template.register_tag('caption', Jekyll::CaptionTag)

---

如果将行分隔符设置为空格，将列分隔符设置为“=”，将引号char设置为“”，则可以使用Ruby的

CSV

类轻松地将字符串解析为哈希：

require 'csv'

def parse_attrs(input)
  options = { col_sep: '=', row_sep: ' ', quote_char: '"' }
  csv = CSV.new input, options

  csv.each_with_object({}) do |row, attrs|
    attr, value = row
    value ||= true
    attrs[attr] = value
  end
end

例如：

irb(main):031:0> input = 'align="aligncenter" width="500" alt="WER calculation" text="WER calculation" url="../images/2013/11/WER-calculation.png" required'
=> "align=\"aligncenter\" width=\"500\" alt=\"WER calculation\" text=\"WER calculation\" url=\"../images/2013/11/WER-calculation.png\""
irb(main):032:0> parse_attrs input
=> {"align"=>"aligncenter", "width"=>"500", "alt"=>"WER calculation", "text"=>"WER calculation", "url"=>"../images/2013/11/WER-calculation.png"}

---

你可以用同样的方法使用Ruby的类。或者你可以编写一个合适的解析器。我添加了一个解决方案，可以在Python中实现预期的效果。但是我对Ruby是新手，所以你能告诉我如何在Ruby中实现它吗？

def parse(text):
    splitpoints = []

    # parse
    isOpen = False
    for i, char in enumerate(text):
        if char == '"':
            isOpen = not isOpen
        if char == " " and not isOpen:
            splitpoints.append(i)

    # build data structure
    dictionary = {}
    last = 0
    for i in splitpoints:
        key, value = text[last:i].split('=')
        last = i+1
        dictionary[key] = value[1:-1] # remove delimiter
    return dictionary

print(parse('align="aligncenter" width="500" alt="WER calculation" text="WER calculation" url="../images/2013/11/WER-calculation.png"'))

require 'csv'

def parse_attrs(input)
  options = { col_sep: '=', row_sep: ' ', quote_char: '"' }
  csv = CSV.new input, options

  csv.each_with_object({}) do |row, attrs|
    attr, value = row
    value ||= true
    attrs[attr] = value
  end
end

irb(main):031:0> input = 'align="aligncenter" width="500" alt="WER calculation" text="WER calculation" url="../images/2013/11/WER-calculation.png" required'
=> "align=\"aligncenter\" width=\"500\" alt=\"WER calculation\" text=\"WER calculation\" url=\"../images/2013/11/WER-calculation.png\""
irb(main):032:0> parse_attrs input
=> {"align"=>"aligncenter", "width"=>"500", "alt"=>"WER calculation", "text"=>"WER calculation", "url"=>"../images/2013/11/WER-calculation.png"}