Module: NDHash

Defined in:
lib/ndhash.rb,
lib/ndhash/version.rb

Constant Summary collapse

VERSION = 
"0.4.0"

Class Method Summary collapse

Class Method Details

.add_entry(hash, level, entry_num:) ⇒ Object 



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# File 'lib/ndhash.rb', line 29

def add_entry(hash, level, entry_num:)
  hash[get_entry_key(level, entry_num)] = get_value(level, entry_num)
end

.count_levels(hash) ⇒ Object 



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# File 'lib/ndhash.rb', line 45

def count_levels(hash)
  count_levels_rec(1, hash)
end

.count_levels_rec(current_level, hash) ⇒ Object 



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

def count_levels_rec(current_level, hash)
  max_level = current_level
  hash.each_value do |v|
    if Hash === v
      max_level = [count_levels_rec(current_level+1, v), current_level].max
    end
  end
  max_level
end

.generate(levels:, values_per_level: 2, hashes_per_level: 1) ⇒ Object

Raises:

  • (ArgumentError) 


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

def generate(levels:, values_per_level:2, hashes_per_level:1)
  raise ArgumentError, 'Negative or zero value given' if levels < 1 or values_per_level < 0 or hashes_per_level < 0
  raise ArgumentError, 'Less than 1 number of pointers defined for multi-level hash' if levels > 1 and hashes_per_level < 1
  generate_rec(1, levels, values_per_level, hashes_per_level)
end

.generate_rec(current_level, max_level, entries_per_level, pointers_per_level) ⇒ Object 



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# File 'lib/ndhash.rb', line 12

def generate_rec(current_level, max_level, entries_per_level, pointers_per_level)
  hash = {}

  entries_per_level.times do |n|
    add_entry(hash, current_level, entry_num: n+1)
  end

  unless current_level == max_level
    pointers_per_level.times do |n|
      next_level = generate_rec(current_level+1, max_level, entries_per_level, pointers_per_level)
      hash[get_pointer_key(current_level, entry_num: n+1)] = next_level
    end
  end

  hash
end

.get_entry_key(level, entry_num) ⇒ Object 



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# File 'lib/ndhash.rb', line 33

def get_entry_key(level, entry_num)
  "level_#{level}_key_#{entry_num}"
end

.get_pointer_key(level, entry_num:) ⇒ Object 



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# File 'lib/ndhash.rb', line 41

def get_pointer_key(level, entry_num:)
  "level_#{level}_pointer_#{entry_num}"
end

.get_value(level, entry_num) ⇒ Object 



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# File 'lib/ndhash.rb', line 37

def get_value(level, entry_num)
  "level_#{level}_value_#{entry_num}"
end