module Regexp::Syntax

Define the base module and the simplest of tokens.

After loading all the tokens the map is full. Extract all tokens and types into the All and Types constants.

Constants

CURRENT
VERSION_CONST_REGEXP
VERSION_FORMAT
VERSION_REGEXP

Public Instance Methods

comparable(name) click to toggle source

# File lib/regexp_parser/syntax/version_lookup.rb, line 63
def comparable(name)
  # add .99 to treat versions without a patch value as latest patch version
  Gem::Version.new((name.to_s.scan(/\d+/) << 99).join('.'))
end

const_missing(const_name) click to toggle source

Calls superclass method

# File lib/regexp_parser/syntax/version_lookup.rb, line 46
def const_missing(const_name)
  if const_name =~ VERSION_CONST_REGEXP
    return fallback_version_class(const_name)
  end
  super
end

fallback_version_class(version) click to toggle source

# File lib/regexp_parser/syntax/version_lookup.rb, line 53
def fallback_version_class(version)
  sorted = (specified_versions + [version]).sort_by { |ver| comparable(ver) }
  index = sorted.index(version)
  index > 0 && const_get(sorted[index - 1])
end

for(name) click to toggle source

Returns the syntax specification class for the given syntax version name. The special names ‘any’ and ‘*’ return Syntax::Any.

# File lib/regexp_parser/syntax/version_lookup.rb, line 24
def for(name)
  (@alias_map ||= {})[name] ||= version_class(name)
end

new(name) click to toggle source

# File lib/regexp_parser/syntax/version_lookup.rb, line 28
def new(name)
  warn 'Regexp::Syntax.new is deprecated in favor of Regexp::Syntax.for. '\
       'It does not return distinct instances and will be removed in v3.0.0.'
  self.for(name)
end

specified_versions() click to toggle source

# File lib/regexp_parser/syntax/version_lookup.rb, line 59
def specified_versions
  constants.select { |const_name| const_name =~ VERSION_CONST_REGEXP }
end

supported?(name) click to toggle source

# File lib/regexp_parser/syntax/version_lookup.rb, line 34
def supported?(name)
  name =~ VERSION_REGEXP && comparable(name) >= comparable('1.8.6')
end

version_class(version) click to toggle source

# File lib/regexp_parser/syntax/version_lookup.rb, line 38
def version_class(version)
  return Regexp::Syntax::Any if ['*', 'any'].include?(version.to_s)

  version =~ VERSION_REGEXP || raise(InvalidVersionNameError, version)
  version_const_name = "V#{version.to_s.scan(/\d+/).join('_')}"
  const_get(version_const_name) || raise(UnknownSyntaxNameError, version)
end