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# frozen_string_literal: true
require 'regexp_parser'
module EcmaReValidator
# JS doesn't have Unicode matching
UNICODE_CHARACTERS = Regexp::Syntax::Token::UnicodeProperty::All
INVALID_REGEXP = [
# JS doesn't have \A, \Z, \z
:bos, :eos_ob_eol, :eos,
# JS doesn't have lookbehinds
:lookbehind, :nlookbehind,
# JS doesn't have atomic grouping
:atomic,
# JS doesn't have possesive quantifiers
:zero_or_one_possessive, :zero_or_more_possessive, :one_or_more_possessive,
# JS doesn't have named capture groups
:named_ab, :named_sq,
# JS doesn't support modifying options
:options, :options_switch,
# JS doesn't support conditionals
:condition_open,
# JS doesn't support comments
:comment
].freeze
INVALID_TOKENS = INVALID_REGEXP + UNICODE_CHARACTERS
def self.valid?(input)
if input.is_a? String
begin
input = Regexp.new(input)
rescue RegexpError
return false
end
elsif !input.is_a? Regexp
return false
end
Regexp::Scanner.scan(input).none? do |t|
if t[1] == :word || t[1] == :space || t[1] == :digit
t[0] != :type
else
INVALID_TOKENS.include?(t[1])
end
end
end
end
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