Class: Opal::Nodes::IterNode

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

Constant Summary

Constants inherited from NodeWithArgs

NodeWithArgs::SEXP_TO_PARAMETERS

Constants included from Helpers

Helpers::BASIC_IDENTIFIER_RULES, Helpers::ES3_RESERVED_WORD_EXCLUSIVE, Helpers::ES51_RESERVED_WORD, Helpers::IMMUTABLE_PROPS, Helpers::PROTO_SPECIAL_METHODS, Helpers::PROTO_SPECIAL_PROPS, Helpers::RESERVED_FUNCTION_NAMES

Instance Attribute Summary collapse

Attributes inherited from NodeWithArgs

#inline_args, #kwargs_initialized, #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_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, #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

#current_indent, #empty_line, #indent, #ivar, #js_falsy, #js_truthy, #js_truthy_optimize, #line, #lvar_to_js, #mid_to_jsid, #property, #valid_ivar_name?, #valid_name?, #variable

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/iter.rb', line 10

def block_arg
  @block_arg
end

#shadow_args ⇒ Object

Returns the value of attribute shadow_args



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# File 'opal/lib/opal/nodes/iter.rb', line 10

def shadow_args
  @shadow_args
end

Instance Method Details

#args ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 117

def args
  sexp = if Fixnum === args_sexp or args_sexp.nil?
    s(:args)
  elsif args_sexp.is_a?(Sexp) && args_sexp.type == :lasgn
    s(:args, s(:arg, *args_sexp[1]))
  else
    args_sexp[1]
  end

  # compacting _ arguments into a single one (only the first one leaves in the sexp)
  caught_blank_argument = false

  sexp.each_with_index do |part, idx|
    if part.is_a?(Sexp) && part.last == :_
      if caught_blank_argument
        sexp.delete_at(idx)
      end
      caught_blank_argument = true
    end
  end

  sexp
end

#body ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 141

def body
  compiler.returns(body_sexp || s(:nil))
end

#compile ⇒ Object 



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

def compile
  inline_params = nil
  extract_block_arg
  extract_shadow_args
  split_args

  to_vars = identity = body_code = nil

  in_scope do
    inline_params = process(inline_args_sexp)

    identity = scope.identify!
    add_temp "self = #{identity}.$$s || this"

    compile_block_arg
    compile_shadow_args
    compile_inline_args
    compile_post_args
    compile_norm_args

    if compiler.arity_check?
      compile_arity_check
    end

    body_code = stmt(body)
    to_vars = scope.to_vars
  end

  line body_code

  unshift to_vars

  unshift "(#{identity} = function(", inline_params, "){"
  push "}, #{identity}.$$s = self,"
  push " #{identity}.$$brk = $brk," if compiler.has_break?
  push " #{identity}.$$arity = #{arity},"

  if compiler.arity_check?
    push " #{identity}.$$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?
    push " #{identity}.$$has_top_level_mlhs_arg = true,"
  end

  if has_trailing_comma_in_args?
    push " #{identity}.$$has_trailing_comma_in_args = true,"
  end

  push " #{identity})"
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/iter.rb', line 158

def compile_arity_check
  if arity_checks.size > 0
    parent_scope = scope
    while !(parent_scope.top? || parent_scope.def? || parent_scope.class_scope?)
      parent_scope = parent_scope.parent
    end

    context = if parent_scope.top?
      "'<main>'"
    elsif parent_scope.def?
      "'#{parent_scope.mid}'"
    elsif parent_scope.class?
      "'<class:#{parent_scope.name}>'"
    elsif parent_scope.module?
      "'<module:#{parent_scope.name}>'"
    end

    identity = scope.identity

    line "if (#{identity}.$$is_lambda || #{identity}.$$define_meth) {"
    line "  var $arity = arguments.length;"
    line "  if (#{arity_checks.join(' || ')}) { Opal.block_ac($arity, #{arity}, #{context}); }"
    line "}"
  end
end

#compile_block_arg ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 83

def compile_block_arg
  if block_arg
    block_arg = variable(self.block_arg.to_s)
    scope.block_name = block_arg
    scope.add_temp block_arg
    scope_name = scope.identify!

    line "#{block_arg} = #{scope_name}.$$p || nil, #{scope_name}.$$p = null;"
  end
end

#compile_norm_args ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 76

def compile_norm_args
  norm_args.each do |arg|
    arg = variable(arg[1])
    push "if (#{arg} == null) #{arg} = nil;"
  end
end

#compile_shadow_args ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 100

def compile_shadow_args
  shadow_args.each do |shadow_arg|
    scope.add_local(shadow_arg.last)
  end
end

#extract_block_arg ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 94

def extract_block_arg
  if args.is_a?(Sexp) && args.last.is_a?(Sexp) and args.last.type == :block_pass
    self.block_arg = args.pop[1][1].to_sym
  end
end

#extract_shadow_args ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 106

def extract_shadow_args
  if args.is_a?(Sexp)
    @shadow_args = []
    args.children.each_with_index do |arg, idx|
      if arg.type == :shadowarg
        @shadow_args << args.delete(arg)
      end
    end
  end
end

#has_top_level_mlhs_arg? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/iter.rb', line 149

def has_top_level_mlhs_arg?
  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 153

def has_trailing_comma_in_args?
  args.meta[:has_trailing_comma]
end

#mlhs_args ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 145

def mlhs_args
  scope.mlhs_mapping.keys
end

#norm_args ⇒ Object 



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# File 'opal/lib/opal/nodes/iter.rb', line 72

def norm_args
  @norm_args ||= args[1..-1].select { |arg| arg.type == :arg }
end