Class: Opal::Nodes::IterNode

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

Instance Attribute Summary

Attributes inherited from NodeWithArgs

#arity, #original_args, #used_kwargs

Attributes inherited from ScopeNode

#await_encountered, #block_name, #catch_return, #defs, #gvars, #has_break, #has_retry, #identity, #ivars, #locals, #methods, #mid, #name, #parent, #rescue_else_sexp, #scope_name

Attributes inherited from Base

#compiler, #sexp, #type

Instance Method Summary collapse

Methods inherited from NodeWithArgs

#compile_arity_check, #compile_body_or_shortcut, define_shortcut, #initialize, #parameters_code, shortcuts_for, #simple_value?

Methods inherited from ScopeNode

#accepts_using?, #add_arg, #add_proto_ivar, #add_scope_gvar, #add_scope_ivar, #add_scope_local, #add_scope_temp, #class?, #class_scope?, #collect_refinements_temps, #current_rescue, #def?, #def_in_class?, #defines_lambda, #find_parent_def, #gen_retry_id, #has_local?, #has_rescue_else?, #has_temp?, #identify!, #in_ensure, #in_ensure?, #in_resbody, #in_resbody?, #in_rescue, #in_scope, #in_while?, #initialize, #is_lambda!, #iter?, #lambda?, #lambda_definition?, #module?, #nesting, #new_refinements_temp, #new_temp, #next_temp, #pop_while, #prepare_block, #push_while, #queue_temp, #refinements_temp, #relative_access, #sclass?, #scope_locals, #self, #super_chain, #to_vars, #top?, #uses_block!, #uses_block?

Methods inherited from Base

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

Methods included from Helpers

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

Constructor Details

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

Instance Method Details

#arity_check_node ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 135

def arity_check_node
  s(:iter_arity_check, original_args)
end

#compile ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 13

def compile
  is_lambda! if scope.lambda_definition?

  compile_body_or_shortcut

  blockopts = []
  blockopts << "$$arity: #{arity}"
  blockopts << "$$s: #{scope.self}" if @define_self
  blockopts << "$$brk: $brk" if contains_break?

  if compiler.arity_check?
    blockopts << "$$parameters: #{parameters_code}"
  end

  # MRI expands a passed argument if the block:
  # 1. takes a single argument that is an array
  # 2. has more that one argument
  # With a few exceptions:
  # 1. mlhs arg: if a block takes |(a, b)| argument
  # 2. trailing ',' in the arg list (|a, |)
  # This flag on the method indicates that a block has a top level mlhs argument
  # which means that we have to expand passed array explicitly in runtime.
  if has_top_level_mlhs_arg?
    blockopts << "$$has_top_level_mlhs_arg: true"
  end

  if has_trailing_comma_in_args?
    blockopts << "$$has_trailing_comma_in_args: true"
  end

  if blockopts.length == 1
    push ", #{arity}"
  elsif blockopts.length > 1
    push ', {', blockopts.join(', '), '}'
  end

  scope.nesting if @define_nesting
  scope.relative_access if @define_relative_access
end

#compile_block_arg ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 90

def compile_block_arg
  if block_arg
    scope.prepare_block
  end
end

#compile_body ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 53

def compile_body
  inline_params = nil

  to_vars = identity = body_code = nil

  in_scope do
    identity = scope.identify!

    inline_params = process(inline_args)

    compile_arity_check

    body_code = stmt(returned_body)

    add_temp "self = #{identity}.$$s == null ? this : #{identity}.$$s" if @define_self

    to_vars = scope.to_vars

    line body_code

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

  unshift to_vars

  if await_encountered
    unshift "async function #{identity}(", inline_params, '){'
  else
    unshift "function #{identity}(", inline_params, '){'
  end
  push '}'
end

#contains_break? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/iter.rb', line 139

def contains_break?
  finder = Opal::Rewriters::BreakFinder.new
  finder.process(@sexp)
  finder.found_break?
end

#extract_underscore_args ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 96

def extract_underscore_args
  valid_args = []
  caught_blank_argument = false

  args.children.each do |arg|
    arg_name = arg.children.first
    if arg_name == :_
      unless caught_blank_argument
        caught_blank_argument = true
        valid_args << arg
      end
    else
      valid_args << arg
    end
  end

  @sexp = @sexp.updated(
    nil, [
      args.updated(nil, valid_args),
      stmts
    ]
  )
end

#has_top_level_mlhs_arg? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/iter.rb', line 124

def has_top_level_mlhs_arg?
  original_args.children.any? { |arg| arg.type == :mlhs }
end

#has_trailing_comma_in_args? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/iter.rb', line 128

def has_trailing_comma_in_args?
  if original_args.loc && original_args.loc.expression
    args_source = original_args.loc.expression.source
    args_source.match(/,\s*\|/)
  end
end

#returned_body ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 120

def returned_body
  compiler.returns(stmts || s(:nil))
end