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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_node ⇒ Object 

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

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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_args ⇒ Object 

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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_body ⇒ Object 

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# File 'opal/lib/opal/nodes/iter.rb', line 97
def returned_body
 compiler.returns(body || s(:nil))
end

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