Class: VDF4R::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/vdf4r/parser.rb

Instance Method Summary collapse

Constructor Details

#initialize(input) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/vdf4r/parser.rb', line 11

def initialize(input)
  case
  when input.respond_to?(:each_line)
    @input = input.each_line.to_a
  when input.respond_to?(:lines)
    @input = input.lines
  else
    raise ArgumentError.new('input must respond to #each_line or #lines')
  end
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/vdf4r/parser.rb', line 22

def parse
  parser = VDF4R::KeyValuesParser.new
  store  = Store.new
  key    = nil
  path   = []

  @input.each do |line|
    node = parser.parse(line)
    raise "ungrammatical content: '#{line}'" if node.nil?

    next if [:blank, :comment].include?(node.value)

    if node.value.respond_to?(:to_ary)
      case node.value.length
      when 1
        key = node.value.first
      when 2
        k, v = node.value
        store.traverse(path)[k] = v
      end
    elsif node.value.kind_of?(Symbol)
      case node.value
      when :enter_object
        raise 'no preceding key for object' unless key
        raise 'too recursive' if path.length > MAX_RECURSION
        path.push key
        key = nil
      when :exit_object
        raise 'nesting unbalanced (excessive exit)' if path.empty?
        path.pop
      end
    end
  end

  raise 'nesting unbalanced (insufficient exit)' unless path.empty?

  store
end