Module: RTLit::Converter

Defined in:
lib/rtlit/converter.rb

Overview

CSS string LTR to RTL converter

Class Method Summary collapse

Class Method Details

.to_rtl(css) ⇒ String

Convert CSS properties and values from LTR to RTL. Accepts any valid CSS string. Returns a CSS string.

Example:

css = "
  body {
    text-align: left;
    padding-right: 10px;
  }"

rtl_css = to_rtl(css)

Parameters:

  • css (String) —

    the css string to convert to RTL

Returns:

  • (String) —

    the RTL version of the css



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# File 'lib/rtlit/converter.rb', line 26

def to_rtl(css) ''
  place_holder = '|====|'
  converted_css = css.gsub 'ltr', 'rtl'

  ltr_matches = converted_css.scan /^([\n\s]*[^:\n\t\s\.\#\{\}]*(left|right)[^:]*:)|(:[^\w\.\#\{\}]*[^;\.\#\{\}]*(left|right)[^;]*;)/
  css_to_replace = ltr_matches.flatten.delete_if{|a| a.nil? || ['left','right'].include?(a) }
  css_to_replace.each do |match|
    next if match.include? 'right' or match =~ /(left|right)\s(top|bottom|\d+[\w%]+)/
    converted_css.gsub! match, (match.gsub 'left', place_holder)
  end
  css_to_replace.each do |match|
    next if match.include? 'left' or match =~ /(left|right)\s(top|bottom|\d+[\w%]+)/
    converted_css.gsub! match, (match.gsub 'right', 'left')
  end
  converted_css.gsub! place_holder, 'right'

  quad_matches = converted_css.scan /(-?\d+(?:px|pt|em|%)+|@\w+)\s+(-?\d+(?:px|pt|em|%)+|@\w+)\s+(-?\d+(?:px|pt|em|%)+|@\w+)\s+(-?\d+(?:px|pt|em|%)+|@\w+)/
  #quad_matches = converted_css.scan /[\-\d\w\@\%]+\s+[\-\d\w\@\%]+\s+[\-\d\w\@\%]+\s+[\-\d\w\@\%]+/
  quad_matches.each do |ar|
    m = ar.join(' ')
    t, r, b, l = m.split ' '
    converted_css.gsub! m, [t,l,b,r].join(' ')
  end
  return converted_css
end