Class: Junoser::RuleTree::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/junoser/rule_tree/parser.rb

Instance Method Summary collapse

Constructor Details

#initialize(content) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/junoser/rule_tree/parser.rb', line 4

def initialize(content)
  @content = content
  @nodes = {}
  @root = nil
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/junoser/rule_tree/parser.rb', line 15

def parse
  rules = content.scan(/^rule\(:([a-z\d_]+)\) do\n(.*?)^end/m)
  root_index = rules.index { |r| r[0] == 'configuration' }
  primitives = rules.map(&:first)
                    .then { |r| r[0, root_index] } + %w[any]

  validate_uniq rules[root_index..].map(&:first)

  @nodes = Hash[rules[root_index..].map { |name, _| [name, Node.new(name)] }]
  used = Set.new

  rules[root_index..].map do |name, refs|
    children = refs.split.map { |i| i.strip.gsub(/,$/, '') }
                   .reject { |i| primitives.include?(i) }
                   .uniq
    used += children
    children.each do |child|
      raise %(Unknown rule: #{child}) unless @nodes[child]
      @nodes[name] << @nodes[child]
    end
  end

  validate_used @nodes.keys, used.to_a
end

#print ⇒ Object 



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# File 'lib/junoser/rule_tree/parser.rb', line 10

def print
  parse
  @nodes['configuration'].print 0
end