98 lines
2.7 KiB
Ruby
98 lines
2.7 KiB
Ruby
# almost simplest hash imaginable. make good use of Lists
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module Parfait
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class Dictionary < Object
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attribute :keys
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attribute :values
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# only empty initialization for now
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#
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# internally we store keys and values in lists, which means this does **not** scale well
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def initialize
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super()
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self.keys = List.new()
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self.values = List.new()
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end
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# are there any key/value items in the list
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def empty?
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self.keys.empty?
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end
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# How many key/value pairs there are
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def length()
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return self.keys.get_length()
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end
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# get a value fot the given key
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# key identity is checked with == not === (ie equals not identity)
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# return nil if no such key
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def get(key)
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index = key_index(key)
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if( index )
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self.values.get(index)
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else
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nil
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end
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end
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# same as get(key)
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def [](key)
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get(key)
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end
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# private method
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def key_index(key)
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len = self.keys.get_length()
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index = 1
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found = nil
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while(index <= len)
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if( self.keys.get(index) == key)
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found = index
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break
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end
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index += 1
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end
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found
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end
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# set key with value, returns value
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def set(key , value)
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index = key_index(key)
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if( index )
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self.keys.set(index , value)
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else
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self.keys.push(key)
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self.values.push(value)
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end
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value
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end
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#same as set(k,v)
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def []=(key,val)
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set(key,val)
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end
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# yield to each key value pair
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def each
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index = 1
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while index <= self.keys.get_length
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key = self.keys.get(index)
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value = self.values.get(index)
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yield key , value
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index = index + 1
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end
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self
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end
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# :rehash, :to_hash, :to_h, :to_a, :[], :fetch, :[]=, :store, :default, :default=, :default_proc, :default_proc=,
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# :key, :index, :size, :length, :empty?, :each_value, :each_key, :each_pair, :each, :keys, :values,
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# :values_at, :shift, :delete, :delete_if, :keep_if, :select, :select!, :reject, :reject!, :clear, :invert,
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# :update, :replace, :merge!, :merge, :assoc, :rassoc, :flatten, :include?, :member?, :has_key?, :has_value?,
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# :key?, :value?, :compare_by_identity, :compare_by_identity?, :entries, :sort, :sort_by, :grep, :count, :find,
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# :detect, :find_index, :find_all, :collect, :map, :flat_map, :collect_concat, :inject, :reduce, :partition,
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# :group_by, :first, :all?, :any?, :one?, :none?, :min, :max, :minmax, :min_by, :max_by, :minmax_by, :each_with_index,
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# :reverse_each, :each_entry, :each_slice, :each_cons, :each_with_object, :zip, :take, :take_while, :drop, :drop_while,
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# :cycle, :chunk, :slice_before, :lazy
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end
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end
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