Class: Cry::Codegen::Crystallizer

Inherits:
Object
  • Object
show all
Defined in:
lib/cry/codegen/crystallizer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ruby_method, interface) ⇒ Crystallizer

Returns a new instance of Crystallizer.



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# File 'lib/cry/codegen/crystallizer.rb', line 8

def initialize(ruby_method, interface)
  @ruby_method = ruby_method
  @crystal_arg_types = interface.crystal_arg_types
  @crystal_ret_type = interface.crystal_ret_type
end

Instance Attribute Details

#crystal_arg_types ⇒ Object

Returns the value of attribute crystal_arg_types.



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# File 'lib/cry/codegen/crystallizer.rb', line 6

def crystal_arg_types
  @crystal_arg_types
end

#crystal_ret_type ⇒ Object

Returns the value of attribute crystal_ret_type.



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# File 'lib/cry/codegen/crystallizer.rb', line 6

def crystal_ret_type
  @crystal_ret_type
end

#ruby_method ⇒ Object

Returns the value of attribute ruby_method.



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# File 'lib/cry/codegen/crystallizer.rb', line 6

def ruby_method
  @ruby_method
end

Instance Method Details

#crystallize ⇒ Object 



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# File 'lib/cry/codegen/crystallizer.rb', line 14

def crystallize
  funcs = []
  declaration, initialization = function_declaration(ruby_method, crystal_arg_types, crystal_ret_type)
  if crystal_ret_type.is_array?
    initialization << "\n__return_array_=("
    definition = function_definition(ruby_method)
    definition = definition.delete_suffix("end\n")
    definition << <<~CODE
        )
        l = __return_array_.size.to_i32
        __return_len_[0] = l
        __return_array_.to_unsafe
      end
    CODE
  elsif crystal_ret_type == 'String'
    initialization << "\n__return_str_=("
    definition = function_definition(ruby_method)
    definition = definition.delete_suffix("end\n")
    definition << <<~CODE
        )
        l = __return_str_.bytesize
        __return_len_[0] = l
        __return_str_.bytes.to_unsafe
      end
    CODE
  else
    definition = function_definition(ruby_method)
  end
  funcs << CrystalFunction.new(declaration, initialization, definition)
  funcs
end

#function_declaration(ruby_method, crystal_arg_types, crystal_ret_type) ⇒ Object 



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# File 'lib/cry/codegen/crystallizer.rb', line 46

def function_declaration(ruby_method, crystal_arg_types, crystal_ret_type)
  if ruby_method.arg_names.size != crystal_arg_types.size
    raise "The number of arguments of #{ruby_method.name} is different: #{ruby_method.arg_names.size} != #{crystal_arg_types.size}"
  end

  init = []
  d = CrystalFunction::Declaration.new
  d.name = ruby_method.name
  ruby_method.arg_names.zip(crystal_arg_types).each do |n, t|
    case t
    when /Array\((.*)\)/
      init << "  #{n} = #{t}.new(__#{n}_len_){|i| __#{n}_ptr_[i]}" # better copy ?
      d.arg_names << "__#{n}_ptr_"
      d.arg_types << "#{::Regexp.last_match(1)}*"
      d.arg_names << "__#{n}_len_"
      d.arg_types << 'Int32'
    when 'String'
      init << "  #{n} = String.new(__#{n}_ptr_, __#{n}_len_)"
      d.arg_names << "__#{n}_ptr_"
      d.arg_types << 'UInt8*'
      d.arg_names << "__#{n}_len_"
      d.arg_types << 'Int32'
    else
      d.arg_names << n
      d.arg_types << t
    end
  end

  if crystal_ret_type.is_array?
    d.arg_names << '__return_len_'
    d.arg_types << 'Int32*'
    d.ret_type = crystal_ret_type.inner_pointer
  elsif crystal_ret_type == 'String'
    d.arg_names << '__return_len_'
    d.arg_types << 'Int32*'
    d.ret_type = 'UInt8*'
  else
    d.ret_type = crystal_ret_type
  end

  initialization = init.join("\n")
  [d.source, initialization]
end

#function_definition(ruby_method) ⇒ Object 



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# File 'lib/cry/codegen/crystallizer.rb', line 90

def function_definition(ruby_method)
  # FIXME
  ruby_method.source.lines[1..].join
end

#source ⇒ Object 



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# File 'lib/cry/codegen/crystallizer.rb', line 95

def source
  crystallize.map(&:source).join("\n\n")
end