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Contents
# frozen_string_literal: true
module Recog
class Fingerprint
#
# @example
# r = RegexpFactory.build("^Apache[ -]Coyote/(\d\.\d)$", "REG_ICASE")
# r.match("Apache-Coyote/1.1")
#
module RegexpFactory
# Currently, only options relating to case insensitivity and
# multiline/newline are supported. Because Recog's data is used by tools
# written in different languages like Ruby and Java, we currently support
# specifying them in a variety of ways. This map controls how they can
# be specified.
#
# TODO: consider supporting only a simpler variant and require that tools
# that use Recog data translate accordingly
FLAG_MAP = {
# multiline variations
'REG_DOT_NEWLINE' => Regexp::MULTILINE,
'REG_LINE_ANY_CRLF' => Regexp::MULTILINE,
'REG_MULTILINE' => Regexp::MULTILINE,
# case variations
'REG_ICASE' => Regexp::IGNORECASE,
'IGNORECASE' => Regexp::IGNORECASE
}.freeze
DEFAULT_FLAGS = 0
# @return [Regexp]
def self.build(pattern, flags)
options = build_options(flags)
Regexp.new(pattern, options)
end
# Convert string flag names as used in Recog XML into a Fixnum suitable for
# passing as the `options` parameter to `Regexp.new`
#
# @see FLAG_MAP
# @param flags [Array<String>]
# @return [Fixnum] Flags for creating a regular expression object
def self.build_options(flags)
unsupported_flags = flags.reject { |flag| FLAG_MAP.key?(flag) }
raise "Unsupported regular expression flags found: #{unsupported_flags.join(',')}. Must be one of: #{FLAG_MAP.keys.join(',')}" unless unsupported_flags.empty?
flags.reduce(DEFAULT_FLAGS) do |sum, flag|
sum | (FLAG_MAP[flag] || 0)
end
end
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems