Module: HtmlToPlainText

Included in:
Premailer
Defined in:
lib/html_to_plain_text.rb

Overview

Support functions for Premailer

Instance Method Summary collapse

Instance Method Details

#convert_to_text(html, line_length, from_charset = 'UTF-8', shorten = false) ⇒ Object

Returns the text in UTF-8 format with all HTML tags removed

TODO:

- add support for DL, OL



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# File 'lib/html_to_plain_text.rb', line 12

def convert_to_text(html, line_length, from_charset = 'UTF-8', shorten = false)
  r = Text::Reform.new(:trim => true, 
                       :squeeze => false, 
                       :break => Text::Reform.break_wrap)

  txt = html

bitly = shorten ? Bitly4R.Keyed("mikedamage", "R_abb45e99634386334b7ed6c8d081e80e") : nil

  he = HTMLEntities.new                                 # decode HTML entities

  txt = he.decode(txt)

  txt.gsub!(/<h([0-9]+)[^>]*>(.*)<\/h[0-9]+>/i) do |s|  # handle headings
    hlevel = $1.to_i
    htext = $2.gsub(/<\/?[^>]*>/i, '')                  # remove tags inside headings
    hlength = (htext.length > line_length ? 
                line_length : 
                htext.length)

    case hlevel
      when 1                                            # H1
        ('*' * hlength) + "\n" + htext + "\n" + ('*' * hlength) + "\n"
      when 2                                            # H2
        ('-' * hlength) + "\n" + htext + "\n" + ('-' * hlength) + "\n"
      else                                              # H3-H6 are styled the same
        htext + "\n" + ('-' * htext.length) + "\n"
    end
  end

  txt.gsub!(/<a.*href=\"([^\"]*)\"[^>]*>(.*)<\/a>/i) do |s|   # links
	if bitly
		$2 + ' [' + bitly.shorten($1) + ']'
	else
		$2 + ' [' + $1 + ']'
	end
  end

  txt.gsub!(/(<li[\s]+[^>]*>|<li>)/i, '  * ')           # unordered LIsts
  txt.gsub!(/<\/p>/i, "\n\n")                           # paragraphs
  
  txt.gsub!(/<\/?[^>]*>/, '')                           # strip remaining tags
  txt.gsub!(/\A[\s]+|[\s]+\Z|^[ \t]+/m, '')             # strip extra spaces
  txt.gsub!(/[\n]{3,}/m, "\n\n")                        # tighten line breaks

  txt = r.format(('[' * line_length), txt)   # wrap text
  txt.gsub!(/^[\*][\s]/m, '  * ')                        # add spaces back to lists
  txt
end