Ruby 1.9的解析散成HTML表格

Question

我有一個Ruby散列，例如：

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

它可以有幾乎任何級別（我可以把哈希散列內任意次數）的深度。它始終具有數組作爲最終值。

如何在不使用Rails的情況下將它解析爲如下所示的HTML表格，並且最好只使用標準庫？

<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> 

Answer 1

應該這樣做：

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 

輸出：

<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>