Class: VDF4R::Parser

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

Class Method Summary collapse

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 21

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

Class Method Details

.clean(input) ⇒ Object 



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# File 'lib/vdf4r/parser.rb', line 12

def clean(input)
  input.gsub(/\\"/, '"')
end

.dirty(input) ⇒ Object 



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# File 'lib/vdf4r/parser.rb', line 16

def dirty(input)
  input.gsub('"', '\"')
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/vdf4r/parser.rb', line 32

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

  @input.each_with_index do |line, index|
    node = parser.parse(Parser.clean(line))

    if node.nil?
      raise "ungrammatical content at line #{index+1}: '#{line}'" if node.nil?
    end

    begin
      _, (encounter, context) = node.value
    rescue NoMethodError => e
      
    end

    case encounter
    when :blank, :comment
      # do nothing
    when :enter_object
      raise 'no preceding key for object' unless key
      raise 'too recursive' if path.length > MAX_RECURSION
      raise 'enter during multi-line value' if partial_value
      path.push key
      key = nil
    when :exit_object
      raise 'nesting unbalanced (excessive exit)' if path.empty?
      raise 'exit during multi-line value' if partial_value
      path.pop
    when :key_value
      k, v = context
      store.traverse(path)[k] = Parser.dirty(v)
    when :key
      key = context[0]
    when :key_enter_value
      key, partial_value = context
    when :key_continue_value
      # raise unless value is non-nil
      partial_value += "\n#{context[0]}"
    when :key_exit_value
      v = partial_value + "\n#{context[0]}"
      partial_value = nil
      store.traverse(path)[k] = Parser.dirty(v)
    else
      raise 'unknown node value'
    end
  end

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

  store
end