Class: BlocklyInterpreter::Parser

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

Defined Under Namespace

Classes: UnknownBlockTypeError

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.register_block_class(block_class) ⇒ Object 



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

def self.register_block_class(block_class)
  raise "Block class #{block_class} has no type specified" unless block_class.block_type
  registered_block_types[block_class.block_type.to_sym] = block_class
end

.registered_block_class_for_type(block_type) ⇒ Object 



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

def self.registered_block_class_for_type(block_type)
  block_class = registered_block_types[block_type.to_sym]

  if block_class
    block_class
  elsif superclass.respond_to?(:registered_block_class_for_type)
    superclass.registered_block_class_for_type(block_type)
  end
end

.registered_block_types ⇒ Object 



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# File 'lib/blockly_interpreter/parser.rb', line 7

def self.registered_block_types
  @registered_block_types ||= {}
end

Instance Method Details

#block_from_dom(element) ⇒ Object 



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# File 'lib/blockly_interpreter/parser.rb', line 44

def block_from_dom(element)
  return unless element
  block_class_for_element(element).new(
    element['type'],
    fields_from_element(element),
    values_from_element(element),
    statements_from_element(element),
    next_block_from_element(element),
    mutation_from_element(element),
    comment_from_element(element),
    comment_pinned_from_element(element),
    element.name == 'shadow',
    element['x'],
    element['y']
  )
end

#parse(xml) ⇒ Object 



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# File 'lib/blockly_interpreter/parser.rb', line 26

def parse(xml)
  dom = Nokogiri::XML.parse(xml)

  if dom.root
    procs, nonprocs = dom.root.css('> block').partition do |element|
      ['procedures_defreturn', 'procedures_defnoreturn'].include? element['type']
    end

    procedures = procs.map { |element| block_from_dom(element) }.index_by(&:procedure_name)
    first_block = block_from_dom(nonprocs.first)
  else
    first_block = nil
    procedures = {}
  end

  BlocklyInterpreter::Program.new(first_block, procedures)
end