module Filter

module ActiveFunctions

include SEXP

def on_send(node)

target, method, *args = node.children

if es2015 and method == :blank?

create_or_update_import("blank$")

process node.updated :send, [nil, "blank$", target]

elsif es2015 and method == :present?

create_or_update_import("present$")

process node.updated :send, [nil, "present$", target]

elsif es2015 and method == :presence

create_or_update_import("presence$")

process node.updated :send, [nil, "presence$", target]

elsif es2015 and method == :chomp

create_or_update_import("chomp$")

process node.updated :send, [nil, "chomp$", target, *args]

elsif es2015 and method == :delete_prefix

create_or_update_import("deletePrefix$")

process node.updated :send, [nil, "deletePrefix$", target, *args]

elsif es2015 and method == :delete_suffix

create_or_update_import("deleteSuffix$")

process node.updated :send, [nil, "deleteSuffix$", target, *args]

else

super

end

end

private

def create_or_update_import(token)

af_import = @options[:import_from_skypack] ? "https://cdn.skypack.dev/@ruby2js/active-functions" : "@ruby2js/active-functions"

if found_node = prepend_list.find {|ast| ast.type == :import && ast.children.first == af_import}

unless found_node.children.last.find {|const| const.children.last == token}

prepend_list.delete found_node

prepend_list << s(:import, found_node.children.first, found_node.children.last.push(s(:const, nil, token)))

end

else

prepend_list << s(:import, af_import, [s(:const, nil, token)])

end

end

end

DEFAULTS.push ActiveFunctions

end