# frozen_string_literal: true

module Opal
  self::REGEXP_START = RUBY_ENGINE == 'opal' ? '^' : '\A'
  self::REGEXP_END = RUBY_ENGINE == 'opal' ? '$' : '\z'

  # Unicode characters in ranges
  # \u0001 - \u002F (blank unicode characters + space + !"#$%&'()*+,-./ chars)
  # \u003A - \u0040 (:;<=>?@ chars)
  # \u005B - \u005E ([\]^ chars)
  # \u0060          (` char)
  # \u007B - \u007F ({|}~ chars})
  # are not allowed to be used in identifier in the beggining or middle of its name
  self::FORBIDDEN_STARTING_IDENTIFIER_CHARS = '\u0001-\u002F\u003A-\u0040\u005B-\u005E\u0060\u007B-\u007F'

  # Unicode characters in ranges
  # \u0001 - \u0020 (blank unicode characters + space)
  # \u0022 - \u002F ("#$%&'()*+,-./ chars)
  # \u003A - \u003E (:;<=> chars)
  # \u0040          (@ char)
  # \u005B - \u005E ([\]^ chars)
  # \u0060          (` char)
  # \u007B - \u007F ({|}~ chars})
  # are not allowed to be used in identifier in the end of its name
  # In fact, FORBIDDEN_STARTING_IDENTIFIER_CHARS = FORBIDDEN_ENDING_IDENTIFIER_CHARS + \u0021 ('?') + \u003F ('!')
  self::FORBIDDEN_ENDING_IDENTIFIER_CHARS   = '\u0001-\u0020\u0022-\u002F\u003A-\u003E\u0040\u005B-\u005E\u0060\u007B-\u007F'
  self::INLINE_IDENTIFIER_REGEXP = Regexp.new("[^#{self::FORBIDDEN_STARTING_IDENTIFIER_CHARS}]*[^#{self::FORBIDDEN_ENDING_IDENTIFIER_CHARS}]")

  # For constants rules are pretty much the same, but ':' is allowed and '?!' are not.
  # Plus it may start with a '::' which indicates that the constant comes from toplevel.
  self::FORBIDDEN_CONST_NAME_CHARS = '\u0001-\u0020\u0021-\u002F\u003B-\u003F\u0040\u005B-\u005E\u0060\u007B-\u007F'
  self::CONST_NAME_REGEXP = Regexp.new("#{self::REGEXP_START}(::)?[A-Z][^#{self::FORBIDDEN_CONST_NAME_CHARS}]*#{self::REGEXP_END}")
end