Parslet Transform Mod

gistfile1.rb

require 'parslet'

class Parslet::Transform
  def transform_elt(elt, context) # :nodoc: 
    rules.each do |pattern, block|
      if bindings=pattern.match(elt, context)
        # Produces transformed value
        return call_on_match({:node => elt}.merge(bindings), block)
      end
    end
    
    # No rule matched - element is not transformed
    return elt
  end
end

class Parslet::Pattern
  def element_match_hash(tree, exp, bindings)    
    # We iterate over expected pattern, since we demand that the keys that
    # are there should be in tree as well.
    exp.each do |expected_key, expected_value|
      return false unless tree.has_key? expected_key
      
      # Recurse into the value and stop early on failure
      value = tree[expected_key]
      return false unless element_match(value, expected_value, bindings)
    end
    
    return true
  end  
end