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@robmiller
Created Jan 5, 2018
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A Ruby implementation of SMOG (Simple Measure of Gobbledygook) scoring for measuring text complexity.
#!/usr/bin/env ruby
#
# Calculates the SMOG (Simple Measure of Gobbledygook) score for a given
# piece of text. A CLI utility that could very easily be adapted into
# a library if I could be be bothered.
#
# More on SMOG: https://en.wikipedia.org/wiki/SMOG
#
# Author: Rob Miller <r@robm.me.uk>
#
# Usage:
#
# $ ./smog path/to/file.txt
# SMOG score: 15.34
# Sentences: 14
# Words: 263
# Polysyllables: 64
class Smog
def initialize(text)
@text = text
end
def score
(3.1291 + 1.043 * Math.sqrt(num_polysyllables * ( 30 / num_sentences.to_f ))).round(2)
end
def num_sentences
sentences.length
end
def num_words
words.length
end
def num_polysyllables
polysyllables.length
end
private
attr_reader :text
def sentences
@sentences ||= text.split(/\.|!|\?|\;/).reject { |s| s !~ /\w/ }
end
def words
@words ||= text.split(/\s+|—|–/).reject { |w| w !~ /\w/i }.map { |w| w.gsub(/[\(),]/, "") }
end
def polysyllables
@polysyllables ||= words.find_all { |word| Syllables.new(word).count >= 3 }
end
# A Ruby port of Greg Fast's Perl original, from the
# Lingua::EN::Syllable package:
# http://search.cpan.org/dist/Lingua-EN-Syllable/
#
# That original is copyright (c) 1999 by Greg Fast and distributed
# under the GPL.
class Syllables
SUBTRACT = [
/cial/,
/tia/,
/cius/,
/cious/,
/giu/,
/ion/,
/iou/,
/sia$/,
/.ely$/,
/[^td]ed$/,
]
ADD = [
/ia/,
/riet/,
/dien/,
/iu/,
/io/,
/ii/,
/microor/,
/[aeiouym]bl$/,
/[aeiou]{3}/,
/^mc/,
/ism$/,
/isms$/,
/([^aeiouy])\1l$/,
/[^l]lien/,
/^coa[dglx]./,
/[^gq]ua[^auieo]/,
/dnt$/,
]
def initialize(word)
@word = word
end
def count
word = @word.dup.downcase
return 2 if word == "w"
return 1 if word.length == 1
word.gsub!("'", "")
word.gsub!(/e$/, "")
scrugg = word.split(/[^aeiouy]+/).reject { |s| s.nil? || s == "" }
syl = 0
SUBTRACT.each do |pattern|
syl -= 1 if word =~ pattern
end
ADD.each do |pattern|
syl += 1 if word =~ pattern
end
syl += scrugg.length
syl = 1 if syl == 0
syl
end
end
end
smog = Smog.new(File.read(ARGV[0]))
puts "SMOG score: #{smog.score}"
puts "Sentences: #{smog.num_sentences}"
puts "Words: #{smog.num_words}"
puts "Polysyllables: #{smog.num_polysyllables}"
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