From: ale@...
Date: 2001-09-01T19:46:41+09:00
Subject: [ruby-talk:20664] Re: replacing items in arrays

Hello Tobias,

On Sat, 1 Sep 2001, Tobias Reif wrote:

> -----------snip-----------
> 
> lines = [["item0-0","item1-0"],["item0-1","item1-1"]]
> 
> td_lines = lines.collect do |line|
>    line.collect do |item|
>       '<td>' + item + '</td>'
>    end
> end
> 
> tr_lines = td_lines.collect do |line|
>    '<tr>' + line.to_s + '</tr>'
> end
> 
> print tr_lines
> 
> -----------snip-----------
> 
> Is that the Ruby way to do it? Anyone?

This is an imperative way to do it. I wouldn't dare to call it procedural
way.

Anyway, I like OO to certain useful extend, and I like ruby enabling me to
use OO effectively. Here would be my first stab trying to objectify a
simple table generation.

    - Aleksi


class String
  def to_html
    to_s
  end
end

class HTMLTableElement
  def initialize(element)
    @element = element
  end
  def to_s
    @element
  end
  def to_html
    "<td>" + @element.to_html + "</td>"
  end
end

class HTMLTableRow
  def initialize(elements)
    @elements = elements
  end
  def to_s
    @elements.join(', ')
  end
  def to_html
    "<tr>" + @elements.collect { |elem| elem.to_html }.join('') +
"</tr>\n"
  end
end

class HTMLTable
  attr_accessor :rows
  def initialize(rows = [])
    @rows = rows
  end
  def to_s
    @rows.join("\n")
  end
  def to_html
    "<table>\n" + @rows.collect { |row| row.to_html }.join('') +
"</table>\n"
  end
end

table = HTMLTable.new

# later you can easily implement things like:
# table.headers = [HTMLTableHeader.new('foo'), HTMLTableHeader.new('bar')]

pure_text_content = [
  ['foo1', 'bar1',],
  ['foo2', 'bar2',],
]

table.rows = pure_text_content.collect do |row|
  HTMLTableRow.new(row.collect { |elem| HTMLTableElement.new(elem) })
end

puts "Pure text table:", table
puts "\nHTML table:",    table.to_html

		 
####################

And it's output:

Pure text table:
foo1, bar1
foo2, bar2

HTML table:
<table>
<tr><td>foo1</td><td>bar1</td></tr>
<tr><td>foo2</td><td>bar2</td></tr>
</table>