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

#block_name, #catch_return, #defs, #gvars, #has_break, #identity, #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

#compile_arity_check, #initialize, #parameters_code

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, #has_local?, #has_rescue_else?, #has_temp?, #identify!, #in_ensure, #in_ensure?, #in_scope, #in_while?, #initialize, #iter?, #module?, #new_temp, #next_temp, #pop_while, #push_while, #queue_temp, #sclass?, #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_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 Method Details

#arity_check_nodeObject


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# File 'opal/lib/opal/nodes/iter.rb', line 112

def arity_check_node
  s(:iter_arity_check, original_args)
end

#compileObject


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

def compile
  inline_params = nil

  to_vars = identity = body_code = nil

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

    inline_params = process(inline_args)

    compile_arity_check

    body_code = stmt(returned_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 contains_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_block_argObject


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# File 'opal/lib/opal/nodes/iter.rb', line 62

def compile_block_arg
  if block_arg
    scope.block_name = block_arg
    scope.add_temp block_arg
    scope_name = scope.identify!

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

#contains_break?Boolean

Returns:

  • (Boolean)

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# File 'opal/lib/opal/nodes/iter.rb', line 116

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

#extract_underscore_argsObject


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# File 'opal/lib/opal/nodes/iter.rb', line 73

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),
      body
    ]
  )
end

#has_top_level_mlhs_arg?Boolean

Returns:

  • (Boolean)

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# File 'opal/lib/opal/nodes/iter.rb', line 101

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 105

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_bodyObject


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# File 'opal/lib/opal/nodes/iter.rb', line 97

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