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Contents
require 'opal/nodes/base'
module Opal
module Nodes
# A node responsible for extracting a
# single MLHS argument
#
# MLHS argument is the left hand side
# of a multiple assignment (Multiple Left Hand Side)
#
# def m((a, b))
# def m((a, *b))
#
# MLHS can include simple arguments (see NormargNode)
# and rest arguments (see RestargNode)
#
class MlhsArgNode < Base
handle :mlhs
def compile
args_sexp = s(:post_args, *children)
if @sexp.meta[:post]
# In this case source is an item in the current scope.working_arguments
# First we should extract mlhs as a simple argument
mlhs_sexp = s(:arg, mlhs_name)
mlhs_sexp.meta[:post] = true
scope.with_inline_args([]) do
push process(mlhs_sexp)
end
var_name = args_sexp.meta[:js_source] = mlhs_name
else
# Otherwise we already have it in our scope.working_arguments
# (of course, in this case scope.working_arguments = 'arguments')
var_name = args_sexp.meta[:js_source] = scope.mlhs_mapping[@sexp]
end
line "if (#{var_name} == null) {"
line " #{var_name} = nil;"
line "}"
line "#{var_name} = Opal.to_ary(#{var_name});"
scope.with_inline_args([]) do
scope.in_mlhs do
push process(args_sexp)
end
end
end
def mlhs_name
@mlhs_name ||= begin
if @sexp.meta[:post]
result = ["$mlhs_of"]
children.each do |child|
case child.type
when :arg
result << child[1]
when :mlhs
result << 'mlhs'
end
end
result.join("_")
else
@sexp[1].to_s
end
end
end
def inline_args
@inline_args ||= children.take_while { |arg| arg.type != :restarg && arg.type != :optarg }
end
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems