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require 'delegate'
module Sass
module Util
# A hash that normalizes its string keys while still allowing you to get back
# to the original keys that were stored. If several different values normalize
# to the same value, whichever is stored last wins.
class NormalizedMap
# Create a normalized map
def initialize(map = nil)
@key_strings = {}
@map = {}
map.each {|key, value| self[key] = value} if map
end
# Specifies how to transform the key.
#
# This can be overridden to create other normalization behaviors.
def normalize(key)
key.tr("-", "_")
end
# Returns the version of `key` as it was stored before
# normalization. If `key` isn't in the map, returns it as it was
# passed in.
#
# @return [String]
def denormalize(key)
@key_strings[normalize(key)] || key
end
# @private
def []=(k, v)
normalized = normalize(k)
@map[normalized] = v
@key_strings[normalized] = k
v
end
# @private
def [](k)
@map[normalize(k)]
end
# @private
def has_key?(k)
@map.has_key?(normalize(k))
end
# @private
def delete(k)
normalized = normalize(k)
@key_strings.delete(normalized)
@map.delete(normalized)
end
# @return [Hash] Hash with the keys as they were stored (before normalization).
def as_stored
Sass::Util.map_keys(@map) {|k| @key_strings[k]}
end
def empty?
@map.empty?
end
def values
@map.values
end
def keys
@map.keys
end
def each
@map.each {|k, v| yield(k, v)}
end
def size
@map.size
end
def to_hash
@map.dup
end
def to_a
@map.to_a
end
def map
@map.map {|k, v| yield(k, v)}
end
def dup
d = super
d.send(:instance_variable_set, "@map", @map.dup)
d
end
def sort_by
@map.sort_by {|k, v| yield k, v}
end
def update(map)
map = map.as_stored if map.is_a?(NormalizedMap)
map.each {|k, v| self[k] = v}
end
def method_missing(method, *args, &block)
if Sass.tests_running
raise ArgumentError.new("The method #{method} must be implemented explicitly")
end
@map.send(method, *args, &block)
end
def respond_to_missing?(method, include_private = false)
@map.respond_to?(method, include_private)
end
end
end
end
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