Class: Opal::Nodes::DefNode

Inherits:
NodeWithArgs show all
Defined in:
opal/lib/opal/nodes/def.rb

Overview

FIXME: needs rewrite

Direct Known Subclasses

DefsNode

Constant Summary

Constants inherited from NodeWithArgs

NodeWithArgs::SEXP_TO_PARAMETERS

Instance Attribute Summary collapse

Attributes inherited from NodeWithArgs

#inline_args, #kwargs_initialized, #mlhs_args, #mlhs_mapping, #post_args, #used_kwargs, #working_arguments

Attributes inherited from ScopeNode

#block_name, #catch_return, #defs, #gvars, #has_break, #ivars, #locals, #methods, #mid, #name, #parent, #rescue_else_sexp, #scope_name, #uses_super, #uses_zuper

Attributes inherited from Base

#compiler, #type

Instance Method Summary collapse

Methods inherited from NodeWithArgs

#arity, #arity_checks, #build_parameter, #compile_block_arg, #compile_inline_args, #compile_post_args, #has_only_optional_kwargs?, #has_required_kwargs?, #in_mlhs, #in_mlhs?, #initialize, #inline_args_sexp, #keyword_args, #negative_arity, #opt_args, #optimize_args!, #parameters_code, #positive_arity, #post_args_sexp, #rest_arg, #split_args, #with_inline_args

Methods inherited from ScopeNode

#add_arg, #add_proto_ivar, #add_scope_gvar, #add_scope_ivar, #add_scope_local, #add_scope_temp, #class?, #class_scope?, #def?, #def_in_class?, #find_parent_def, #get_super_chain, #has_local?, #has_rescue_else?, #has_temp?, #identify!, #identity, #in_ensure, #in_ensure?, #in_scope, #in_while?, #initialize, #iter?, #module?, #new_temp, #next_temp, #pop_while, #proto, #push_while, #queue_temp, #sclass?, #to_vars, #top?, #uses_block!, #uses_block?

Methods inherited from Base

#add_gvar, #add_ivar, #add_local, #add_temp, #children, children, #class_variable_owner, #closest_module_node, #comments, #compile_to_fragments, #error, #expr, #expr?, #expr_or_nil, #fragment, handle, handlers, #has_rescue_else?, #helper, #in_ensure, #in_ensure?, #in_while?, #initialize, #process, #push, #recv, #recv?, #s, #scope, #stmt, #stmt?, truthy_optimize?, #unshift, #while_loop, #with_temp, #wrap

Methods included from Helpers

#conditional_send, #current_indent, #empty_line, #indent, #js_falsy, #js_truthy, #js_truthy_optimize, #line, #mid_to_jsid, #property, #valid_name?

Constructor Details

This class inherits a constructor from Opal::Nodes::NodeWithArgs

Instance Attribute Details

#block_arg ⇒ Object

Returns the value of attribute block_arg



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# File 'opal/lib/opal/nodes/def.rb', line 12

def block_arg
  @block_arg
end

Instance Method Details

#comments_code ⇒ Object 



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# File 'opal/lib/opal/nodes/def.rb', line 157

def comments_code
  '[' + comments.map { |comment| comment.text.inspect }.join(', ') + ']'
end

#compile ⇒ Object 



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# File 'opal/lib/opal/nodes/def.rb', line 26

def compile
  extract_block_arg
  split_args

  inline_params = nil
  scope_name = nil

  # block name (&block)
  if block_arg
    block_name = block_arg
  end

  in_scope do
    scope.mid = mid
    scope.defs = true if @sexp.type == :defs

    if block_name
      scope.uses_block!
      scope.add_arg block_name
    end

    scope.block_name = block_name || '$yield'

    inline_params = process(inline_args_sexp)

    stmt_code = stmt(compiler.returns(stmts))

    add_temp 'self = this'

    compile_inline_args
    compile_post_args

    scope.identify!
    scope_name = scope.identity

    compile_block_arg

    if compiler.arity_check?
      compile_arity_check
    end

    if scope.uses_zuper
      add_local '$zuper'
      add_local '$zuper_i'
      add_local '$zuper_ii'

      line "// Prepare super implicit arguments"
      line "for($zuper_i = 0, $zuper_ii = arguments.length, $zuper = new Array($zuper_ii); $zuper_i < $zuper_ii; $zuper_i++) {"
      line "  $zuper[$zuper_i] = arguments[$zuper_i];"
      line "}"
    end

    unshift "\n#{current_indent}", scope.to_vars

    line stmt_code

    if scope.catch_return
      unshift "try {\n"
      line "} catch ($returner) { if ($returner === Opal.returner) { return $returner.$v }"
      push " throw $returner; }"
    end
  end

  # There are some special utf8 chars that can be used as valid JS
  # identifiers, some examples:
  #
  # utf8_pond = 'ⵌ'
  # utf8_question = 'ʔ̣'
  # utf8_exclamation 'ǃ'
  #
  # For now we're just using $$, to maintain compatibility with older IEs.
  function_name = valid_name?(mid) ? " $$#{mid}" : ''

  unshift ") {"
  unshift(inline_params)
  unshift "function#{function_name}("
  unshift "#{scope_name} = " if scope_name
  line "}"

  push ", #{scope_name}.$$arity = #{arity}"

  if compiler.arity_check?
    push ", #{scope_name}.$$parameters = #{parameters_code}"
  end

  if compiler.parse_comments?
    push ", #{scope_name}.$$comments = #{comments_code}"
  end

  if compiler.enable_source_location?
    push ", #{scope_name}.$$source_location = #{source_location}"
  end

  wrap_with_definition
end

#compile_arity_check ⇒ Object

Returns code used in debug mode to check arity of method call



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# File 'opal/lib/opal/nodes/def.rb', line 142

def compile_arity_check
  if arity_checks.size > 0
    meth = scope.mid.to_s.inspect
    line "var $arity = arguments.length;"
    push " if (#{arity_checks.join(' || ')}) { Opal.ac($arity, #{arity}, this, #{meth}); }"
  end
end

#extract_block_arg ⇒ Object 



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# File 'opal/lib/opal/nodes/def.rb', line 14

def extract_block_arg
  *regular_args, last_arg = args.children
  if last_arg && last_arg.type == :blockarg
    @block_arg = last_arg.children[0]
    @sexp = @sexp.updated(nil, [
      mid,
      s(:args, *regular_args),
      stmts
    ])
  end
end

#source_location ⇒ Object 



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# File 'opal/lib/opal/nodes/def.rb', line 150

def source_location
  file = @sexp.loc.expression.source_buffer.name
  line = @sexp.loc.line

  "['#{file}.rb', #{line}]"
end

#wrap_with_definition ⇒ Object 



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# File 'opal/lib/opal/nodes/def.rb', line 122

def wrap_with_definition
  if    scope.iter?                   then unshift "Opal.def(self, '$#{mid}', "
  elsif scope.module? || scope.class? then unshift "Opal.defn(self, '$#{mid}', "
  elsif scope.sclass?                 then unshift "Opal.defn(self, '$#{mid}', "
  elsif compiler.eval?                then unshift "Opal.def(self, '$#{mid}', "
  elsif scope.top?                    then unshift "Opal.defn(Opal.Object, '$#{mid}', "
  elsif scope.def?                    then unshift "Opal.def(self, '$#{mid}', "
  else raise "Unsupported use of `def`; please file a bug at https://github.com/opal/opal/issues/new reporting this message."
  end

  push ')'

  if expr?
    wrap '(', ", nil) && '#{mid}'"
  else
    unshift "\n#{current_indent}"
  end
end