Class: Chef::Attribute::Validator::WildcardExpander::BrutalRegex

Inherits:
Chef::Attribute::Validator::WildcardExpander show all
Defined in:
lib/chef-attribute-validator/wildcard_expander/brutal_regex.rb

Instance Attribute Summary

Attributes inherited from Chef::Attribute::Validator::WildcardExpander

#node, #path_spec

Instance Method Summary collapse

Methods inherited from Chef::Attribute::Validator::WildcardExpander

choose, #fetch_val_by_slashpath, #initialize, #path_contains_wildcards?, #path_exists_by_slashpath?, #slashpath_to_steps

Constructor Details

This class inherits a constructor from Chef::Attribute::Validator::WildcardExpander

Instance Method Details

#convert_path_spec_to_regex ⇒ Object 



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# File 'lib/chef-attribute-validator/wildcard_expander/brutal_regex.rb', line 51

def convert_path_spec_to_regex
  re = path_spec.dup

  # Anchor everything
  re = '^' + re + '$'

  # * => "anything but a slash"
  re.gsub!(/([^*])\*(?!\*)/, '\1[^\/]*')
  
  # ? => "any single char other than a slash"
  re.gsub!(/\?/, '[^\/]')

  # ** => "anything"
  re.gsub!(/\*\*/, '.*')

  # {,} =>  alternatives # TODO

  Regexp.new(re)

end

#expand_all ⇒ Object 



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# File 'lib/chef-attribute-validator/wildcard_expander/brutal_regex.rb', line 9

def expand_all
  # Create a massive list of all attribute paths, in slashpath format
  all_slashpaths = find_all_slashpaths

  # Convert the path_spec into a terrifying regex
  regex_spec = convert_path_spec_to_regex

  # Filter the list by grepping
  all_slashpaths.grep(regex_spec)

end

#find_all_slashpaths(prefix = '', node_cursor = nil) ⇒ Object

TODO: maybe we could cache this on the node, or something?



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# File 'lib/chef-attribute-validator/wildcard_expander/brutal_regex.rb', line 28

def find_all_slashpaths (prefix='', node_cursor = nil)
  node_cursor ||= node
  child_paths = []

  
  if node_cursor.kind_of?(Array)
    node_cursor.each_index do |idx|
      child_paths.push prefix + '/' + idx.to_s
      if node_cursor[idx].kind_of?(Mash) || node_cursor[idx].kind_of?(Array)
        child_paths += find_all_slashpaths(prefix + '/' + idx.to_s, node_cursor[idx])
      end                
    end
  else
    node_cursor.keys.each do |key|
      child_paths.push prefix + '/' + key.to_s
      if node_cursor[key].kind_of?(Mash) || node_cursor[key].kind_of?(Array)
        child_paths += find_all_slashpaths(prefix + '/' + key, node_cursor[key])
      end
    end
  end
  child_paths
end

#suitability ⇒ Object 



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# File 'lib/chef-attribute-validator/wildcard_expander/brutal_regex.rb', line 21

def suitability
  # I can do anything, but I'll do it badly
  0.1
end