Class: CodeHistogram

Inherits:
Object
  • Object
show all
Defined in:
lib/zombie_killer/code_histogram.rb

Overview

Keep track of the count of occurences of things (in code)

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ CodeHistogram

Returns a new instance of CodeHistogram.



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# File 'lib/zombie_killer/code_histogram.rb', line 7

def initialize
  @counts = Hash.new do |hash, key|
    hash[key] = 0
  end
end

Instance Attribute Details

#counts ⇒ Object (readonly)

Returns the value of attribute counts.



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# File 'lib/zombie_killer/code_histogram.rb', line 5

def counts
  @counts
end

Class Method Details

.parse_by_frequency(lines) ⇒ Object 



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# File 'lib/zombie_killer/code_histogram.rb', line 27

def self.parse_by_frequency(lines)
  histogram = CodeHistogram.new
  lines.each do |line|
    /^\s*(\d*)\s*(.*)/.match(line.chomp) do |m|
      histogram.increment(m[2], m[1].to_i)
    end
  end
  histogram
end

Instance Method Details

#increment(key, value = 1) ⇒ Object 



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# File 'lib/zombie_killer/code_histogram.rb', line 13

def increment(key, value = 1)
  @counts[key] += value
end

#merge!(other) ⇒ Object 



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# File 'lib/zombie_killer/code_histogram.rb', line 37

def merge!(other)
  counts.merge!(other.counts) do |_key, count, other_count|
    count + other_count
  end
end

#print_by_frequency(io) ⇒ Object 



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# File 'lib/zombie_killer/code_histogram.rb', line 17

def print_by_frequency(io)
  count_to_methods = invert_hash_preserving_duplicates(@counts)

  count_to_methods.keys.sort.each do |c|
    count_to_methods[c].sort.each do |method|
      io.printf("%4d %s\n", c, method)
    end
  end
end