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[depot.git] / vendor / rails / activesupport / lib / active_support / core_ext / hash / indifferent_access.rb

diff --git a/vendor/rails/activesupport/lib/active_support/core_ext/hash/indifferent_access.rb b/vendor/rails/activesupport/lib/active_support/core_ext/hash/indifferent_access.rb
new file mode 100644 (file)
index 0000000..c96c516
--- /dev/null
+++ b/vendor/rails/activesupport/lib/active_support/core_ext/hash/indifferent_access.rb
@@ -0,0 +1,137 @@
+# This class has dubious semantics and we only have it so that
+# people can write params[:key] instead of params['key']
+# and they get the same value for both keys.
+
+class HashWithIndifferentAccess < Hash
+  def initialize(constructor = {})
+    if constructor.is_a?(Hash)
+      super()
+      update(constructor)
+    else
+      super(constructor)
+    end
+  end
+
+  def default(key = nil)
+    if key.is_a?(Symbol) && include?(key = key.to_s)
+      self[key]
+    else
+      super
+    end
+  end
+
+  alias_method :regular_writer, :[]= unless method_defined?(:regular_writer)
+  alias_method :regular_update, :update unless method_defined?(:regular_update)
+
+  # Assigns a new value to the hash:
+  #
+  #   hash = HashWithIndifferentAccess.new
+  #   hash[:key] = "value"
+  #
+  def []=(key, value)
+    regular_writer(convert_key(key), convert_value(value))
+  end
+
+  # Updates the instantized hash with values from the second:
+  # 
+  #   hash_1 = HashWithIndifferentAccess.new
+  #   hash_1[:key] = "value"
+  # 
+  #   hash_2 = HashWithIndifferentAccess.new
+  #   hash_2[:key] = "New Value!"
+  # 
+  #   hash_1.update(hash_2) # => {"key"=>"New Value!"}
+  # 
+  def update(other_hash)
+    other_hash.each_pair { |key, value| regular_writer(convert_key(key), convert_value(value)) }
+    self
+  end
+
+  alias_method :merge!, :update
+
+  # Checks the hash for a key matching the argument passed in:
+  #
+  #   hash = HashWithIndifferentAccess.new
+  #   hash["key"] = "value"
+  #   hash.key? :key  # => true
+  #   hash.key? "key" # => true
+  #
+  def key?(key)
+    super(convert_key(key))
+  end
+
+  alias_method :include?, :key?
+  alias_method :has_key?, :key?
+  alias_method :member?, :key?
+
+  # Fetches the value for the specified key, same as doing hash[key]
+  def fetch(key, *extras)
+    super(convert_key(key), *extras)
+  end
+
+  # Returns an array of the values at the specified indices:
+  #
+  #   hash = HashWithIndifferentAccess.new
+  #   hash[:a] = "x"
+  #   hash[:b] = "y"
+  #   hash.values_at("a", "b") # => ["x", "y"]
+  #
+  def values_at(*indices)
+    indices.collect {|key| self[convert_key(key)]}
+  end
+
+  # Returns an exact copy of the hash.
+  def dup
+    HashWithIndifferentAccess.new(self)
+  end
+
+  # Merges the instantized and the specified hashes together, giving precedence to the values from the second hash
+  # Does not overwrite the existing hash.
+  def merge(hash)
+    self.dup.update(hash)
+  end
+
+  # Removes a specified key from the hash.
+  def delete(key)
+    super(convert_key(key))
+  end
+
+  def stringify_keys!; self end
+  def symbolize_keys!; self end
+  def to_options!; self end
+
+  # Convert to a Hash with String keys.
+  def to_hash
+    Hash.new(default).merge(self)
+  end
+
+  protected
+    def convert_key(key)
+      key.kind_of?(Symbol) ? key.to_s : key
+    end
+
+    def convert_value(value)
+      case value
+      when Hash
+        value.with_indifferent_access
+      when Array
+        value.collect { |e| e.is_a?(Hash) ? e.with_indifferent_access : e }
+      else
+        value
+      end
+    end
+end
+
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Hash #:nodoc:
+      module IndifferentAccess #:nodoc:
+        def with_indifferent_access
+          hash = HashWithIndifferentAccess.new(self)
+          hash.default = self.default
+          hash
+        end
+      end
+    end
+  end
+end