41学习面向对象术语

require 'open-uri'

WORD_URL = "http://learncodethehardway.org/words.txt"
WORDS = []

PHRASES = {
	"class ### < ###/nend" => 
		"Make a class named ### that is-a ###.",
	"class ###\n\tdef initialize(@@@)\n\tend\nend" =>
		"class ### has-a initialize that takes @@@ parameters.",
	"class ###\n\tdef ***(@@@)\n\tend\nend" =>
		"class ### has-a function named *** that takes @@@ parameters.",
	"*** = ###.new()" =>
		"Set *** to a instance class ###.",
	"***.***(@@@)" =>
		"From *** get the *** function, and call it with parameters @@@.",
	"***.*** = '***'" =>
		"From *** get the *** attribute and set it to '***'."
}

PHRASE_FIRST = ARGV[0] == "english"

open(WORD_URL) {|f|
	f.each_line {|word| WORDS.push(word.chomp)}
}

def craft_names(rand_words, snippet, pattern, caps=false)
	names = snippet.scan(pattern).map do
		word = rand_words.pop()
		caps ? word.capitalize : word
	end
	
	return names * 2
end

def craft_params(rand_words, snippet, pattern)
	names = (0...snippet.scan(pattern).length).map do
		param_count = rand(3) + 1
		params = (0...param_count).map {|x| rand_words.pop() }
		params.join(', ')
	end
	
	return names * 2
end

def convert(snippet, phrase)
	rand_words = WORDS.sort_by {rand}
	class_names = craft_names(rand_words, snippet, /###/, caps=true)
	other_names = craft_names(rand_words, snippet, /\*\*\*/)
	param_names = craft_params(rand_words, snippet, /@@@/)
	
	results = []
	
	[snippet, phrase].each do |sentence|
		# fake class names, also copies sentence
		result = sentence.gsub(/###/) {|x| class_names.pop }
		
		# fake other names
		result.gsub!(/\*\*\*/) {|x| other_names.pop }
		
		# fake parameter lists
		result.gsub!(/@@@/) {|x| param_names.pop }
	
		results.push(result)
	end
	
	return results
end

# keep going until they hit CTRL-D
loop do
	snippets = PHRASES.keys().sort_by {rand}
	
	for snippet in snippets
		phrase = PHRASES[snippet]
		question, answer = convert(snippet, phrase)
		
		if PHRASE_FIRST
			question, answer = answer, question
		end
		
		print question, "\n\n> "
		
		exit(0) unless $stdin.gets
		
		puts "\nANSWER: %s\n\n" % answer
	end
end
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41学习面向对象术语

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