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Contents
defmodule PigLatin do
@doc """
Given a `phrase`, translate it a word at a time to Pig Latin.
Words beginning with consonants should have the consonant moved to the end of
the word, followed by "ay".
Words beginning with vowels (aeiou) should have "ay" added to the end of the
word.
Some groups of letters are treated like consonants, including "ch", "qu",
"squ", "th", "thr", and "sch".
Some groups are treated like vowels, including "yt" and "xr".
"""
@spec translate(phrase :: String.t()) :: String.t()
def translate(phrase) do
phrase
|> String.split(" ")
|> Enum.map(&translate_word/1)
|> Enum.join(" ")
end
defp translate_word(word) do
word
|> consonant_prefix_and_rest
|> case do
["", _] -> word <> "ay"
[consonant_prefix, rest] -> rest <> consonant_prefix <> "ay"
_ -> word
end
end
defp consonant_prefix_and_rest(word) do
if Regex.match?(~r/^yt|xr/, word) do
["", word]
else
~r/^(s?qu|(?:[^aeiou]*))?([aeiou].*)$/
|> Regex.run(word, capture: :all_but_first)
end
end
end
Version data entries
81 entries across 81 versions & 1 rubygems