Contents

$:.unshift(File.dirname(__FILE__)) unless
  $:.include?(File.dirname(__FILE__)) || $:.include?(File.expand_path(File.dirname(__FILE__)))

require 'rubygems'
require 'json'

class Jsont
  VERSION = '0.1.0'
  
  def initialize(rules)
    @rules = rules.is_a?(String) ? JSON.parse(rules) : rules.dup
    @rules.each do |r,v| 
      if r[0,4] != 'self'
        @rules["self.#{r}"] = @rules.delete(r)
      end
    end
  end
  
  def transform(target)
    @parent = target.is_a?(String) ? JSON.parse(target) : target
    apply!('self',@parent)
  end
  
  def apply!(target_path, target)
    case target
    when Array
      target.each_index do |i|
        target[i] = apply!("#{target_path}[*]", apply!("#{target_path}[#{i}]", target[i]))
      end
    when Hash
      target.each do |k, v|
        target[k] = apply!("#{target_path}.?", apply!("#{target_path}.#{k}", target[k]))
      end
    end
    
    if (rule = @rules[target_path])
      rule.gsub(/\{([a-z0-9\$\.]+)\}/) do |match|
        path = match[1,match.size - 2]
        n = case path[0]
        when ?$
          target
        else
          @parent
        end
        path.gsub!(/^\$\.?/,'')

        if path.size > 0
          path.split('.').each do |piece|
            n = case piece
            when /^[0-9]+$/
              n[Integer(piece)]
            else
              n[piece]
            end
          end
        end
        n
      end
    else
      target
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
jsont-0.1.0	lib/jsont.rb