module Mustermann

Maps a type to its factory.

@example

Mustermann[:sinatra] # => Mustermann::Sinatra

@param [Symbol] name a pattern type identifier @raise [ArgumentError] if the type is not supported @return [Class, new] pattern factory

# File lib/mustermann.rb, line 88
def self.[](name)
  return name if name.respond_to? :new
  @types.fetch(normalized = normalized_type(name)) do
    @mutex.synchronize do
      error = try_require "mustermann/#{normalized}"
      @types.fetch(normalized) { raise ArgumentError, "unsupported type %p#{" (#{error.message})" if error}" % name }
    end
  end
end

@!visibility private

# File lib/mustermann.rb, line 119
def self.extend_object(object)
  return super unless defined? ::Sinatra::Base and object.is_a? Class and object < ::Sinatra::Base
  require 'mustermann/extension'
  object.register Extension
end

Creates a new pattern based on input.

• From {Mustermann::Pattern}: returns given pattern.

• From String: creates a pattern from the string, depending on type option (defaults to {Mustermann::Sinatra})

• From Regexp: creates a {Mustermann::Regular} pattern.

• From Symbol: creates a {Mustermann::Sinatra} pattern with a single named capture named after the input.

• From an Array or multiple inputs: creates a new pattern from each element, combines them to a {Mustermann::Composite}.

• From anything else: Will try to call to_pattern on it or raise a TypeError.

Note that if the input is a {Mustermann::Pattern}, Regexp or Symbol, the type option is ignored and if to_pattern is called on the object, the type will be handed on but might be ignored by the input object.

If you want to enforce the pattern type, you should create them via their expected class.

@example creating patterns

require 'mustermann'

Mustermann.new("/:name")                    # => #<Mustermann::Sinatra:"/example">
Mustermann.new("/{name}", type: :template)  # => #<Mustermann::Template:"/{name}">
Mustermann.new(/.*/)                        # => #<Mustermann::Regular:".*">
Mustermann.new(:name, capture: :word)       # => #<Mustermann::Sinatra:":name">
Mustermann.new("/", "/*.jpg", type: :shell) # => #<Mustermann::Composite:(shell:"/" | shell:"/*.jpg")>

@example using custom to_pattern

require 'mustermann'

class MyObject
  def to_pattern(**options)
    Mustermann.new("/:name", **options)
  end
end

Mustermann.new(MyObject.new, type: :rails) # => #<Mustermann::Rails:"/:name">

@example enforcing type

require 'mustermann/sinatra'

Mustermann::Sinatra.new("/:name")

@param [String, Pattern, Regexp, Symbol, to_pattern, Array<String, Pattern, Regexp, Symbol, to_pattern>]

input The representation of the pattern

@param [Hash] options The options hash @return [Mustermann::Pattern] pattern corresponding to string. @raise (see []) @raise (see Mustermann::Pattern.new) @raise [TypeError] if the passed object cannot be converted to a pattern @see file:README.md#Types_and_Options “Types and Options” in the README

# File lib/mustermann.rb, line 61
def self.new(*input, type: DEFAULT_TYPE, operator: :|, **options)
  type ||= DEFAULT_TYPE
  input  = input.first if input.size < 2
  case input
  when Pattern then input
  when Regexp  then self[:regexp].new(input, **options)
  when String  then self[type].new(input, **options)
  when Symbol  then self[:sinatra].new(input.inspect, **options)
  when Array   then input.map { |i| new(i, type: type, **options) }.inject(operator)
  else
    pattern = input.to_pattern(type: type, **options) if input.respond_to? :to_pattern
    raise TypeError, "#{input.class} can't be coerced into Mustermann::Pattern" if pattern.nil?
    pattern
  end
end

@!visibility private

# File lib/mustermann.rb, line 114
def self.normalized_type(type)
  type.to_s.gsub('-', '_').downcase
end

@!visibility private

# File lib/mustermann.rb, line 109
def self.register(name, type)
  @types[normalized_type(name)] = type
end

@return [LoadError, nil] @!visibility private

# File lib/mustermann.rb, line 100
def self.try_require(path)
  require(path)
  nil
rescue LoadError => error
  raise(error) unless error.path == path
  error
end