Class: MasterView::CaseInsensitiveHash

Inherits:
Hash
  • Object
show all
Defined in:
lib/masterview/case_insensitive_hash.rb

Overview

Extends Hash to allow case insensitive access to data using any case string or symbol, however it retains the original case when iterated on. When updating a value it first checks for the existence of a case indendependent key and if found uses that for storage key, thus the first form to store determines the case.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ CaseInsensitiveHash

Returns a new instance of CaseInsensitiveHash.



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# File 'lib/masterview/case_insensitive_hash.rb', line 7

def initialize
  super
  init_lcks_map
end

Instance Method Details

#[](key) ⇒ Object

uses a lowercased symbol to find original key which is then used to find value



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# File 'lib/masterview/case_insensitive_hash.rb', line 13

def [](key)
  original_key = @lcks_to_original_key[convert_to_lcs(key)]
  (original_key.nil?) ? nil : super(original_key)
end

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

put value into map first checking if there is already an entry using lowercased symbol, if so use it (it determines key case), otherwise add new entry



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# File 'lib/masterview/case_insensitive_hash.rb', line 20

def []=(key, value)
  lcks = convert_to_lcs(key)
  original_key = @lcks_to_original_key[lcks]
  if original_key.nil? # not found so create new original key in map
    @lcks_to_original_key[lcks] = key
    original_key = key
  end
  super(original_key, value)
end

#get_lowercase_str_value(key) ⇒ Object

retrieves the lowercased string value for the key



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# File 'lib/masterview/case_insensitive_hash.rb', line 42

def get_lowercase_str_value(key)
  value = self[key]
  unless value.nil?
    if value.is_a? String
      value.downcase!
    elsif value.is_a? Symbol
      value = value.to_s.downcase
    else
      value = value.inspect.downcase
    end
  end
  value
end

#replace(hash) ⇒ Object

build hash from another hash



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# File 'lib/masterview/case_insensitive_hash.rb', line 33

def replace(hash)
  super(hash)
  init_lcks_map
  hash.each do |k,v|
    @lcks_to_original_key[convert_to_lcs(k)] = k
  end
end