Class: Map

Inherits:
Hash
  • Object
show all
Defined in:
lib/map.rb,
lib/map/struct.rb,
lib/map/options.rb

Defined Under Namespace

Modules: Arguments, Options Classes: Struct

Constant Summary collapse

Version = 
'2.7.0'
Load = 
Kernel.method(:load)
Dynamic = 
lambda do
  conversion_methods.reverse_each do |method|
    add_conversion_method!(method)
  end
end
Dup = 
instance_method(:dup)

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args, &block) ⇒ Map

Returns a new instance of Map.



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# File 'lib/map.rb', line 168

def initialize(*args, &block)
  case args.size
    when 0
      super(&block)

    when 1
      first = args.first
      case first
        when Hash
          initialize_from_hash(first)
        when Array
          initialize_from_array(first)
        else
          if first.respond_to?(:to_hash)
            initialize_from_hash(first.to_hash)
          else
            initialize_from_hash(first)
          end
      end

    else
      initialize_from_array(args)
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(*args, &block) ⇒ Object

a sane method missing that only supports writing values or reading *previously set* values



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# File 'lib/map.rb', line 561

def method_missing(*args, &block)
  method = args.first.to_s
  case method
    when /=$/
      key = args.shift.to_s.chomp('=')
      value = args.shift
      self[key] = value
    else
      key = method
      unless has_key?(key)
        return(block ? fetch(*args, &block) : super(*args))
      end
      self[key]
  end
end

Class Method Details

.add_conversion_method!(method) ⇒ Object

Raises:

  • (ArguementError) 


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# File 'lib/map.rb', line 70

def add_conversion_method!(method)
  method = method.to_s.strip
  raise ArguementError if method.empty?
  module_eval(<<-__, __FILE__, __LINE__)
    unless public_method_defined?(#{ method.inspect })
      def #{ method }
        self
      end
    end
    unless conversion_methods.include?(#{ method.inspect })
      conversion_methods.unshift(#{ method.inspect })
    end
  __
end

.allocate ⇒ Object 



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# File 'lib/map.rb', line 28

def allocate
  super.instance_eval do
    @keys = []
    self
  end
end

.alphanumeric_key_for(key) ⇒ Object 



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# File 'lib/map.rb', line 691

def Map.alphanumeric_key_for(key)
  return key if Numeric===key
  key.to_s =~ %r/^\d+$/ ? Integer(key) : key
end

.blank?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/map.rb', line 616

def Map.blank?(value)
  return value.blank? if value.respond_to?(:blank?)

  case value
    when String
      value.strip.empty?
    when Numeric
      value == 0
    when false
      true
    else
      value.respond_to?(:empty?) ? value.empty? : !value
  end
end

.coerce(other) ⇒ Object 



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# File 'lib/map.rb', line 49

def coerce(other)
  case other
    when Map
      other
    else
      allocate.update(other.to_hash)
  end
end

.conversion_methods ⇒ Object 



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# File 'lib/map.rb', line 58

def conversion_methods
  @conversion_methods ||= (
    map_like = ancestors.select{|ancestor| ancestor <= Map}
    type_names = map_like.map do |ancestor|
      name = ancestor.name.to_s.strip
      next if name.empty?
      name.downcase.gsub(/::/, '_')
    end.compact
    type_names.map{|type_name| "to_#{ type_name }"}
  )
end

.convert_key(key) ⇒ Object 



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# File 'lib/map.rb', line 219

def self.convert_key(key)
  key.kind_of?(Symbol) ? key.to_s : key
end

.convert_value(value) ⇒ Object 



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# File 'lib/map.rb', line 230

def self.convert_value(value)
  conversion_methods.each do |method|
    #return convert_value(value.send(method)) if value.respond_to?(method)
    if value.respond_to?(method)
      value = value.send(method)
      break
    end
  end

  case value
    when Hash
      coerce(value)
    when Array
      value.map{|v| convert_value(v)}
    else
      value
  end
end

.depth_first_each(enumerable, path = [], accum = [], &block) ⇒ Object 



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# File 'lib/map.rb', line 700

def Map.depth_first_each(enumerable, path = [], accum = [], &block)
  Map.pairs_for(enumerable) do |key, val|
    path.push(key)
    if((val.is_a?(Hash) or val.is_a?(Array)) and not val.empty?)
      Map.depth_first_each(val, path, accum)
    else
      accum << [path.dup, val]
    end
    path.pop()
  end
  if block
    accum.each{|keys, val| block.call(keys, val)}
  else
    [path, accum]
  end
end

.each_pair(*args, &block) ⇒ Object

iterate over arguments in pairs smartly.



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# File 'lib/map.rb', line 92

def each_pair(*args, &block)
  size = args.size
  parity = size % 2 == 0 ? :even : :odd
  first = args.first

  if block.nil?
    result = []
    block = lambda{|*kv| result.push(kv)}
  else
    result = args
  end

  return args if size == 0

  if size == 1
    conversion_methods.each do |method|
      if first.respond_to?(method)
        first = first.send(method)
        break
      end
    end

    if first.respond_to?(:each_pair)
      first.each_pair do |key, val|
        block.call(key, val)
      end
      return args
    end

    if first.respond_to?(:each_slice)
      first.each_slice(2) do |key, val|
        block.call(key, val)
      end
      return args
    end

    raise(ArgumentError, 'odd number of arguments for Map')
  end

  array_of_pairs = args.all?{|a| a.is_a?(Array) and a.size == 2}

  if array_of_pairs
    args.each do |pair|
      key, val, *ignored = pair
      block.call(key, val)
    end
  else
    0.step(args.size - 1, 2) do |a|
      key = args[a]
      val = args[a + 1]
      block.call(key, val)
    end
  end

  args
end

.for(*args, &block) ⇒ Object 



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# File 'lib/map.rb', line 42

def for(*args, &block)
  if(args.size == 1 and block.nil?)
    return args.first if args.first.class == self
  end
  new(*args, &block)
end

.inherited(other) ⇒ Object 



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# File 'lib/map.rb', line 85

def inherited(other)
  other.module_eval(&Dynamic)
  super
end

.libdir(*args, &block) ⇒ Object 



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# File 'lib/map.rb', line 10

def libdir(*args, &block)
  @libdir ||= File.expand_path(__FILE__).sub(/\.rb$/,'')
  libdir = args.empty? ? @libdir : File.join(@libdir, *args.map{|arg| arg.to_s})
ensure
  if block
    begin
      $LOAD_PATH.unshift(libdir) unless $LOAD_PATH.first==libdir
      module_eval(&block)
    ensure
      $LOAD_PATH.shift() if $LOAD_PATH.first==libdir
    end
  end
end

.load(*args, &block) ⇒ Object 



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# File 'lib/map.rb', line 24

def load(*args, &block)
  libdir{ Load.call(*args, &block) }
end

.map_for(hash) ⇒ Object 



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# File 'lib/map.rb', line 210

def Map.map_for(hash)
  map = klass.coerce(hash)
  map.default = hash.default
  map
end

.new(*args, &block) ⇒ Object Also known as: [] 



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# File 'lib/map.rb', line 35

def new(*args, &block)
  allocate.instance_eval do
    initialize(*args, &block)
    self
  end
end

.options_for(*args, &block) ⇒ Object 



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# File 'lib/map/options.rb', line 145

def Map.options_for(*args, &block)
  Map::Options.for(*args, &block)
end

.options_for!(*args, &block) ⇒ Object 



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# File 'lib/map/options.rb', line 149

def Map.options_for!(*args, &block)
  Map::Options.for(*args, &block).pop
end

.pairs_for(enumerable, *args, &block) ⇒ Object 



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# File 'lib/map.rb', line 717

def Map.pairs_for(enumerable, *args, &block)
  if block.nil?
    pairs, block = [], lambda{|*pair| pairs.push(pair)}
  else
    pairs = false
  end

  result =
    case enumerable
      when Hash
        enumerable.each_pair(*args, &block)
      when Array
        enumerable.each_with_index(*args) do |val, key|
          block.call(key, val)
        end
      else
        enumerable.each_pair(*args, &block)
    end

  pairs ? pairs : result
end

.struct(*args, &block) ⇒ Object 



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# File 'lib/map/struct.rb', line 45

def Map.struct(*args, &block)
  new(*args, &block).struct
end

.version ⇒ Object 



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# File 'lib/map.rb', line 6

def version
  Map::Version
end

Instance Method Details

#<=>(other) ⇒ Object 



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# File 'lib/map.rb', line 454

def <=>(other)
  keys <=> klass.coerce(other).keys
end

#==(hash) ⇒ Object

misc



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# File 'lib/map.rb', line 448

def ==(hash)
  return false unless(Map === hash)
  return false if keys != hash.keys
  super hash
end

#=~(hash) ⇒ Object 



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# File 'lib/map.rb', line 458

def =~(hash)
  to_hash == klass.coerce(hash).to_hash
end

#[](key) ⇒ Object 



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# File 'lib/map.rb', line 302

def [](key)
  __get__(convert_key(key))
end

#[]=(key, val) ⇒ Object Also known as: store 



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# File 'lib/map.rb', line 295

def []=(key, val)
  key, val = convert(key, val)
  keys.push(key) unless has_key?(key)
  __set__(key, val)
end

#__get__ ⇒ Object 



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# File 'lib/map.rb', line 292

alias_method '__get__', '[]'

#__set__ ⇒ Object

writer/reader methods



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# File 'lib/map.rb', line 291

alias_method '__set__', '[]='

#__update__ ⇒ Object 



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# File 'lib/map.rb', line 293

alias_method '__update__', 'update'

#alphanumeric_key_for(key) ⇒ Object 



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# File 'lib/map.rb', line 696

def alphanumeric_key_for(key)
  Map.alphanumeric_key_for(key)
end

#apply(other) ⇒ Object 



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# File 'lib/map.rb', line 684

def apply(other)
  Map.for(other).depth_first_each do |keys, value|
    set(keys => value) unless !get(keys).nil?
  end
  self
end

#as_hash ⇒ Object 



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# File 'lib/map.rb', line 513

def as_hash
  @class = Hash
  yield
ensure
  @class = nil
end

#blank?(*keys) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/map.rb', line 611

def blank?(*keys)
  return empty? if keys.empty?
  !has?(*keys) or Map.blank?(get(*keys))
end

#class ⇒ Object 



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# File 'lib/map.rb', line 520

def class
  @class || super
end

#clear ⇒ Object 



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# File 'lib/map.rb', line 387

def clear
  keys.clear
  super
end

#clone ⇒ Object 



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# File 'lib/map.rb', line 281

def clone
  copy
end

#collection_has_key?(collection, key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/map.rb', line 631

def collection_has_key?(collection, key)
  case collection
    when Hash
      collection.has_key?(key)
    when Array
      return false unless key
      (0...collection.size).include?(Integer(key))
  end
end

#conversion_methods ⇒ Object

conversions



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# File 'lib/map.rb', line 492

def conversion_methods
  self.class.conversion_methods
end

#convert(key, val) ⇒ Object 



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# File 'lib/map.rb', line 257

def convert(key, val)
  [convert_key(key), convert_value(val)]
end

#convert_key(key) ⇒ Object 



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# File 'lib/map.rb', line 222

def convert_key(key)
  if klass.respond_to?(:convert_key)
    klass.convert_key(key)
  else
    Map.convert_key(key)
  end
end

#convert_value(value) ⇒ Object Also known as: convert_val 



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# File 'lib/map.rb', line 248

def convert_value(value)
  if klass.respond_to?(:convert_value)
    klass.convert_value(value)
  else
    Map.convert_value(value)
  end
end

#copy ⇒ Object

maps are aggressive with copy operations. they are all deep copies. make a new one if you really want a shallow copy

TODO - fallback to shallow if objects cannot be marshal’d.…



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# File 'lib/map.rb', line 265

def copy
  default = self.default
  self.default = nil
  copy = Marshal.load(Marshal.dump(self)) rescue Dup.bind(self).call()
  copy.default = default
  copy
ensure
  self.default = default
end

#default(key = nil) ⇒ Object 



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# File 'lib/map.rb', line 285

def default(key = nil)
  key.is_a?(Symbol) && include?(key = key.to_s) ? self[key] : super
end

#delete(key) ⇒ Object

mutators



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# File 'lib/map.rb', line 381

def delete(key)
  key = convert_key(key)
  keys.delete(key)
  super(key)
end

#delete_if ⇒ Object 



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# File 'lib/map.rb', line 392

def delete_if
  to_delete = []
  keys.each{|key| to_delete.push(key) if yield(key)}
  to_delete.each{|key| delete(key)}
  self
end

#depth_first_each(*args, &block) ⇒ Object 



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# File 'lib/map.rb', line 739

def depth_first_each(*args, &block)
  Map.depth_first_each(enumerable=self, *args, &block)
end

#dup ⇒ Object 



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# File 'lib/map.rb', line 277

def dup
  copy
end

#each ⇒ Object Also known as: each_pair 



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# File 'lib/map.rb', line 373

def each
  keys.each{|key| yield(key, self[key])}
  self
end

#each_key ⇒ Object 



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# File 'lib/map.rb', line 363

def each_key
  keys.each{|key| yield(key)}
  self
end

#each_value ⇒ Object 



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# File 'lib/map.rb', line 368

def each_value
  keys.each{|key| yield self[key]}
  self
end

#each_with_index ⇒ Object

iterator methods



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# File 'lib/map.rb', line 358

def each_with_index
  keys.each_with_index{|key, index| yield([key, self[key]], index)}
  self
end

#fetch(key, *args, &block) ⇒ Object 



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# File 'lib/map.rb', line 306

def fetch(key, *args, &block)
  super(convert_key(key), *args, &block)
end

#first ⇒ Object 



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# File 'lib/map.rb', line 348

def first
  [keys.first, self[keys.first]]
end

#get(*keys) ⇒ Object

support for compound key indexing and depth first iteration



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# File 'lib/map.rb', line 584

def get(*keys)
  keys = keys.flatten
  return self[keys.first] if keys.size <= 1
  keys, key = keys[0..-2], keys[-1]
  collection = self
  keys.each do |k|
    k = alphanumeric_key_for(k)
    collection = collection[k]
    return collection unless collection.respond_to?('[]')
  end
  collection[alphanumeric_key_for(key)]
end

#has?(*keys) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/map.rb', line 597

def has?(*keys)
  keys = keys.flatten
  collection = self
  return collection_has_key?(collection, keys.first) if keys.size <= 1
  keys, key = keys[0..-2], keys[-1]
  keys.each do |k|
    k = alphanumeric_key_for(k)
    collection = collection[k]
    return collection unless collection.respond_to?('[]')
  end
  return false unless(collection.is_a?(Hash) or collection.is_a?(Array))
  collection_has_key?(collection, alphanumeric_key_for(key))
end

#id ⇒ Object

Raises:

  • (NoMethodError) 


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# File 'lib/map.rb', line 577

def id
  raise NoMethodError unless has_key?(:id)
  self[:id]
end

#initialize_from_array(array) ⇒ Object 



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# File 'lib/map.rb', line 199

def initialize_from_array(array)
  map = self
  Map.each_pair(array){|key, val| map[key] = val}
end

#initialize_from_hash(hash) ⇒ Object 



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# File 'lib/map.rb', line 193

def initialize_from_hash(hash)
  map = self
  map.update(hash)
  map.default = hash.default
end

#inspect ⇒ Object 



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# File 'lib/map.rb', line 484

def inspect
  array = []
  each{|key, val| array << (key.inspect + "=>" + val.inspect)}
  string = '{' + array.join(", ") + '}'
end

#invert ⇒ Object 



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# File 'lib/map.rb', line 462

def invert
  inverted = klass.allocate
  inverted.default = self.default
  keys.each{|key| inverted[self[key]] = key }
  inverted
end

#key?(key) ⇒ Boolean Also known as: include?, has_key?, member?

Returns:

  • (Boolean) 


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# File 'lib/map.rb', line 310

def key?(key)
  super(convert_key(key))
end

#keys ⇒ Object

instance constructor



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# File 'lib/map.rb', line 164

def keys
  @keys ||= []
end

#klass ⇒ Object

support methods



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# File 'lib/map.rb', line 206

def klass
  self.class
end

#last ⇒ Object 



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# File 'lib/map.rb', line 352

def last
  [keys.last, self[keys.last]]
end

#map_for(hash) ⇒ Object 



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# File 'lib/map.rb', line 215

def map_for(hash)
  klass.map_for(hash)
end

#merge(*args) ⇒ Object 



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# File 'lib/map.rb', line 323

def merge(*args)
  copy.update(*args)
end

#pop ⇒ Object 



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# File 'lib/map.rb', line 438

def pop
  unless empty?
    key = keys.last
    val = delete(key)
    [key, val]
  end
end

#push(*args) ⇒ Object 



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# File 'lib/map.rb', line 426

def push(*args)
  Map.each_pair(*args) do |key, val|
    if key?(key)
      delete(key)
    else
      keys.push(key)
    end
    __set__(key, val)
  end
  self
end

#reject(&block) ⇒ Object 



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# File 'lib/map.rb', line 469

def reject(&block)
  dup.delete_if(&block)
end

#reject!(&block) ⇒ Object 



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# File 'lib/map.rb', line 473

def reject!(&block)
  hash = reject(&block)
  self == hash ? nil : hash
end

#replace(*args) ⇒ Object 



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# File 'lib/map.rb', line 399

def replace(*args)
  clear
  update(*args)
end

#reverse_merge(hash) ⇒ Object 



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# File 'lib/map.rb', line 327

def reverse_merge(hash)
  map = copy
  hash.each{|key, val| map[key] = val unless map.key?(key)}
  map
end

#reverse_merge!(hash) ⇒ Object 



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# File 'lib/map.rb', line 333

def reverse_merge!(hash)
  replace(reverse_merge(hash))
end

#select ⇒ Object 



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# File 'lib/map.rb', line 478

def select
  array = []
  each{|key, val| array << [key,val] if yield(key, val)}
  array
end

#set(*args) ⇒ Object 



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# File 'lib/map.rb', line 641

def set(*args)
  if args.size == 1 and args.first.is_a?(Hash)
    options = args.shift
  else
    options = {}
    value = args.pop
    keys = args
    options[keys] = value
  end

  options.each do |keys, value|
    keys = Array(keys).flatten

    collection = self
    if keys.size <= 1
      collection[keys.first] = value
      next
    end

    key = nil

    keys.each_cons(2) do |a, b|
      a, b = alphanumeric_key_for(a), alphanumeric_key_for(b)

      case b
        when Numeric
          collection[a] ||= []
          raise(IndexError, "(#{ collection.inspect })[#{ a.inspect }]=#{ value.inspect }") unless collection[a].is_a?(Array)

        when String, Symbol
          collection[a] ||= {}
          raise(IndexError, "(#{ collection.inspect })[#{ a.inspect }]=#{ value.inspect }") unless collection[a].is_a?(Hash)
      end
      collection = collection[a]
      key = b
    end

    collection[key] = value
  end

  return options.values
end

#shift ⇒ Object

ordered container specific methods



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# File 'lib/map.rb', line 406

def shift
  unless empty?
    key = keys.first
    val = delete(key)
    [key, val]
  end
end

#stringify_keys ⇒ Object 



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# File 'lib/map.rb', line 550

def stringify_keys; dup end

#stringify_keys! ⇒ Object

oh rails - would that map.rb existed before all this non-sense…



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# File 'lib/map.rb', line 549

def stringify_keys!; self end

#struct ⇒ Object 



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# File 'lib/map/struct.rb', line 41

def struct
  @struct ||= Struct.new(map=self)
end

#symbolize_keys ⇒ Object 



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# File 'lib/map.rb', line 552

def symbolize_keys; dup end

#symbolize_keys! ⇒ Object 



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# File 'lib/map.rb', line 551

def symbolize_keys!; self end

#to_array ⇒ Object Also known as: to_a 



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# File 'lib/map.rb', line 528

def to_array
  array = []
  each{|*pair| array.push(pair)}
  array
end

#to_hash ⇒ Object 



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# File 'lib/map.rb', line 504

def to_hash
  hash = Hash.new(default)
  each do |key, val|
    val = val.to_hash if val.respond_to?(:to_hash)
    hash[key] = val
  end
  hash
end

#to_list ⇒ Object 



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# File 'lib/map.rb', line 535

def to_list
  list = []
  each_pair do |key, val|
    list[key.to_i] = val if(key.is_a?(Numeric) or key.to_s =~ %r/^\d+$/)
  end
  list
end

#to_options ⇒ Object 



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# File 'lib/map.rb', line 554

def to_options; dup end

#to_options! ⇒ Object 



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# File 'lib/map.rb', line 553

def to_options!; self end

#to_s ⇒ Object 



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# File 'lib/map.rb', line 543

def to_s
  to_array.to_s
end

#to_yaml(*args, &block) ⇒ Object 



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# File 'lib/map.rb', line 524

def to_yaml(*args, &block)
  as_hash{ super }
end

#unshift(*args) ⇒ Object 



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# File 'lib/map.rb', line 414

def unshift(*args)
  Map.each_pair(*args) do |key, val|
    if key?(key)
      delete(key)
    else
      keys.unshift(key)
    end
    __set__(key, val)
  end
  self
end

#update(*args) ⇒ Object Also known as: merge! 



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# File 'lib/map.rb', line 317

def update(*args)
  Map.each_pair(*args){|key, val| store(key, val)}
  self
end

#values ⇒ Object Also known as: vals 



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# File 'lib/map.rb', line 337

def values
  array = []
  keys.each{|key| array.push(self[key])}
  array
end

#values_at(*keys) ⇒ Object 



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# File 'lib/map.rb', line 344

def values_at(*keys)
  keys.map{|key| self[key]}
end

#with_indifferent_access ⇒ Object 



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# File 'lib/map.rb', line 556

def with_indifferent_access; dup end

#with_indifferent_access! ⇒ Object 



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# File 'lib/map.rb', line 555

def with_indifferent_access!; self end