Ruby 1.9将哈希分析到一个html表中 [英] Ruby 1.9 parse hash into an html table

问题描述

例如：

  {monkeys=> {hamburgers=> [爱，吃]，
巨石=> [憎恨，扔]}，
stonemasons=> {巨石=> [爱，使用]，
vandals=> [仇恨，起诉]} 
} 
  

（我可以把任何次数的哈希内部哈希）的深度。它总是有数组作为最终值。

如何在不使用Rails的情况下将它解析为如下所示的HTML表格，最好只使用标准库？ / p>

 < table> 
< tr> 
< th rowspan =2>猴子< / th> 
 hamburgers< / th> 
< td>爱< / td> 
< td>吃< / td> 
< / tr> 
< tr> 
巨石< / th> 
< td>讨厌< / td> 
< td>掷出< / td> 
< / tr> 
< tr> 
 th rowspan =2>石匠< / th> 
巨石< / th> 
< td>爱< / td> 
< td>使用< / td> 
< / tr> 
< tr> 
破坏者< / th> 
< td>讨厌< / td> 
< td> sue< / td> 
< / tr> 
< / table> 
  

解决方案

应该这样做：

  h = {monkeys=> {hamburgers=> [爱，吃]，
巨石=> [憎恨，扔]}，
stonemasons=> {巨石=> [爱，使用]，
vandals=> [hate，sue]}} 
 
 $ b $ def parse_data（html，data，new_line = true）
 
 klass = data.class 
 
＃使用这个类来知道我们是否需要创建TH或TD 
 case 
当klass == Hash 
 data.each do | key，value | 
 
＃开始一个新行
 if new_line 
 html<< '< tr>'
 new_line = false 
 end 
 
＃检查是否需要使用行数
 if value.class == Array || value.count == 1 
 html<< <的第i;＃{键}< /第> 中
 else 
 html<< < th rowspan = \＃{value.count} \>＃{key}< / th> 
 end 
 
＃解析hash的内容（递归）
 html，new_line = parse_data（html，value，new_line）
结束
当klass = Array 
 data.each do | item | 
 html<< < TD>＃{项}< / TD> 中
 end 
 
＃我们结束行和标志，我们需要开始一个新的
＃如果有数据
 html<< '< / tr>'
 new_line = true 
结束
 
返回html，new_line 
结束
 
 html ='< table> ;'
 html，new_line = parse_data（html，h）
 html<< '< / table>'
 
放入html 
  

输出： p>

 < table> 
< tr> 
< th rowspan =2>猴子< / th> 
 hamburgers< / th> 
< td>爱< / td> 
< td>吃< / td> 
< / tr> 
< tr> 
巨石< / th> 
< td>讨厌< / td> 
< td>掷出< / td> 
< / tr> 
< tr> 
 th rowspan =2>石匠< / th> 
巨石< / th> 
< td>爱< / td> 
< td>使用< / td> 
< / tr> 
< tr> 
破坏者< / th> 
< td>讨厌< / td> 
< td> sue< / td> 
< / tr> 
< / table> 
  

I have a Ruby hash, for example:

{"monkeys"=> {"hamburgers" => ["love", "eat"],
              "boulders" => ["hate", "throw"]},
 "stonemasons" => {"boulders" = > ["love", "use"],
                   "vandals" => ["hate", "sue"]}
}

It can have almost any level (I can put hashes inside hashes any number of times) of depth. It always has arrays as end values.

How can I parse it into an HTML table like the one below without using Rails and, preferably, using only the Standard library?

<table>
  <tr>
    <th rowspan="2">monkeys</th>
    <th>hamburgers</th>
    <td>love</td>
    <td>eat</td>
  </tr>
  <tr>
    <th>boulders</th>
    <td>hate</td>
    <td>throw</td>
  </tr>
  <tr>
    <th rowspan="2">stonemasons</th>
    <th>boulders</th>
    <td>love</td>
    <td>use</td>
  </tr>
  <tr>
    <th>vandals</th>
    <td>hate</td>
    <td>sue</td>
  </tr>
</table>

解决方案

That should do it:

h = {"monkeys"     => {"hamburgers" => ["love", "eat"],
                       "boulders"   => ["hate", "throw"]},
     "stonemasons" => {"boulders"   => ["love", "use"],
                       "vandals"    => ["hate", "sue"]}}


def parse_data(html, data, new_line = true)

  klass = data.class

  # Use the class to know if we need to create TH or TD
  case
  when klass == Hash
    data.each do |key, value|

      # Start a new row
      if new_line
        html << '<tr>'
        new_line = false
      end

      # Check if we need to use a rowspan
      if value.class == Array || value.count == 1
        html << "<th>#{key}</th>"
      else
        html << "<th rowspan=\"#{value.count}\">#{key}</th>"
      end

      # Parse the content of the hash (recursive)
      html, new_line = parse_data(html, value, new_line)
    end
  when klass = Array
    data.each do |item|
      html << "<td>#{item}</td>"
    end

    # We end the row and flag that we need to start a new one
    # if there is anymore data
    html << '</tr>'
    new_line = true
  end

  return html, new_line
end

html = '<table>'
html, new_line = parse_data(html, h)
html << '</table>'

puts html

Output:

<table>
  <tr>
    <th rowspan="2">monkeys</th>
    <th>hamburgers</th>
    <td>love</td>
    <td>eat</td>
  </tr>
  <tr>
    <th>boulders</th>
    <td>hate</td>
    <td>throw</td>
  </tr>
  <tr>
    <th rowspan="2">stonemasons</th>
    <th>boulders</th>
    <td>love</td>
    <td>use</td>
  </tr>
  <tr>
    <th>vandals</th>
    <td>hate</td>
    <td>sue</td>
  </tr>
</table>

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