pig-latin

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Danil Negrienko 2024-06-27 13:45:50 -04:00
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{
"authors": [
"DoggettCK"
],
"contributors": [
"alarregoity",
"angelikatyborska",
"Cohen-Carlisle",
"devonestes",
"moxley",
"neenjaw",
"sotojuan"
],
"files": {
"solution": [
"lib/pig_latin.ex"
],
"test": [
"test/pig_latin_test.exs"
],
"example": [
".meta/example.ex"
]
},
"blurb": "Implement a program that translates from English to Pig Latin.",
"source": "The Pig Latin exercise at Test First Teaching by Ultrasaurus",
"source_url": "https://github.com/ultrasaurus/test-first-teaching/blob/master/learn_ruby/pig_latin/"
}

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{"track":"elixir","exercise":"pig-latin","id":"3bcf481d20874254afa072bd2aabe30d","url":"https://exercism.org/tracks/elixir/exercises/pig-latin","handle":"negrienko","is_requester":true,"auto_approve":false}

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# Used by "mix format"
[
inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
]

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elixir/pig-latin/.gitignore vendored Normal file
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# The directory Mix will write compiled artifacts to.
/_build/
# If you run "mix test --cover", coverage assets end up here.
/cover/
# The directory Mix downloads your dependencies sources to.
/deps/
# Where third-party dependencies like ExDoc output generated docs.
/doc/
# Ignore .fetch files in case you like to edit your project deps locally.
/.fetch
# If the VM crashes, it generates a dump, let's ignore it too.
erl_crash.dump
# Also ignore archive artifacts (built via "mix archive.build").
*.ez
# Ignore package tarball (built via "mix hex.build").
pig_latin-*.tar

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elixir/pig-latin/HELP.md Normal file
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# Help
## Running the tests
From the terminal, change to the base directory of the exercise then execute the tests with:
```bash
$ mix test
```
This will execute the test file found in the `test` subfolder -- a file ending in `_test.exs`
Documentation:
* [`mix test` - Elixir's test execution tool](https://hexdocs.pm/mix/Mix.Tasks.Test.html)
* [`ExUnit` - Elixir's unit test library](https://hexdocs.pm/ex_unit/ExUnit.html)
## Pending tests
In test suites of practice exercises, all but the first test have been tagged to be skipped.
Once you get a test passing, you can unskip the next one by commenting out the relevant `@tag :pending` with a `#` symbol.
For example:
```elixir
# @tag :pending
test "shouting" do
assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
end
```
If you wish to run all tests at once, you can include all skipped test by using the `--include` flag on the `mix test` command:
```bash
$ mix test --include pending
```
Or, you can enable all the tests by commenting out the `ExUnit.configure` line in the file `test/test_helper.exs`.
```elixir
# ExUnit.configure(exclude: :pending, trace: true)
```
## Useful `mix test` options
* `test/<FILE>.exs:LINENUM` - runs only a single test, the test from `<FILE>.exs` whose definition is on line `LINENUM`
* `--failed` - runs only tests that failed the last time they ran
* `--max-failures` - the suite stops evaluating tests when this number of test failures
is reached
* `--seed 0` - disables randomization so the tests in a single file will always be ran
in the same order they were defined in
## Submitting your solution
You can submit your solution using the `exercism submit lib/pig_latin.ex` command.
This command will upload your solution to the Exercism website and print the solution page's URL.
It's possible to submit an incomplete solution which allows you to:
- See how others have completed the exercise
- Request help from a mentor
## Need to get help?
If you'd like help solving the exercise, check the following pages:
- The [Elixir track's documentation](https://exercism.org/docs/tracks/elixir)
- The [Elixir track's programming category on the forum](https://forum.exercism.org/c/programming/elixir)
- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
If you're stuck on something, it may help to look at some of the [available resources](https://exercism.org/docs/tracks/elixir/resources) out there where answers might be found.

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# Pig Latin
Welcome to Pig Latin on Exercism's Elixir Track.
If you need help running the tests or submitting your code, check out `HELP.md`.
## Introduction
Your parents have challenged you and your sibling to a game of two-on-two basketball.
Confident they'll win, they let you score the first couple of points, but then start taking over the game.
Needing a little boost, you start speaking in [Pig Latin][pig-latin], which is a made-up children's language that's difficult for non-children to understand.
This will give you the edge to prevail over your parents!
[pig-latin]: https://en.wikipedia.org/wiki/Pig_latin
## Instructions
Your task is to translate text from English to Pig Latin.
The translation is defined using four rules, which look at the pattern of vowels and consonants at the beginning of a word.
These rules look at each word's use of vowels and consonants:
- vowels: the letters `a`, `e`, `i`, `o`, and `u`
- consonants: the other 21 letters of the English alphabet
## Rule 1
If a word begins with a vowel, or starts with `"xr"` or `"yt"`, add an `"ay"` sound to the end of the word.
For example:
- `"apple"` -> `"appleay"` (starts with vowel)
- `"xray"` -> `"xrayay"` (starts with `"xr"`)
- `"yttria"` -> `"yttriaay"` (starts with `"yt"`)
## Rule 2
If a word begins with a one or more consonants, first move those consonants to the end of the word and then add an `"ay"` sound to the end of the word.
For example:
- `"pig"` -> `"igp"` -> `"igpay"` (starts with single consonant)
- `"chair"` -> `"airch"` -> `"airchay"` (starts with multiple consonants)
- `"thrush"` -> `"ushthr"` -> `"ushthray"` (starts with multiple consonants)
## Rule 3
If a word starts with zero or more consonants followed by `"qu"`, first move those consonants (if any) and the `"qu"` part to the end of the word, and then add an `"ay"` sound to the end of the word.
For example:
- `"quick"` -> `"ickqu"` -> `"ay"` (starts with `"qu"`, no preceding consonants)
- `"square"` -> `"aresqu"` -> `"aresquay"` (starts with one consonant followed by `"qu`")
## Rule 4
If a word starts with one or more consonants followed by `"y"`, first move the consonants preceding the `"y"`to the end of the word, and then add an `"ay"` sound to the end of the word.
Some examples:
- `"my"` -> `"ym"` -> `"ymay"` (starts with single consonant followed by `"y"`)
- `"rhythm"` -> `"ythmrh"` -> `"ythmrhay"` (starts with multiple consonants followed by `"y"`)
## Source
### Created by
- @DoggettCK
### Contributed to by
- @alarregoity
- @angelikatyborska
- @Cohen-Carlisle
- @devonestes
- @moxley
- @neenjaw
- @sotojuan
### Based on
The Pig Latin exercise at Test First Teaching by Ultrasaurus - https://github.com/ultrasaurus/test-first-teaching/blob/master/learn_ruby/pig_latin/

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defmodule PigLatin do
@doc """
Given a `phrase`, translate it a word at a time to Pig Latin.
"""
@vowels ~w(a e i o u)
@spec translate(phrase :: String.t()) :: String.t()
def translate(phrase) do
phrase
|> String.split()
|> Enum.map(&String.graphemes/1)
|> Enum.map(&translate_word/1)
|> Enum.join(" ")
end
@spec translate_word(word :: [String.t()]) :: String.t()
defp translate_word(["q", "u" | rest]), do: rest ++ ~w(quay)
defp translate_word(["x", "r" | _rest] = word), do: ay(word)
defp translate_word(["y", "t" | _rest] = word), do: ay(word)
defp translate_word([hd | _rest] = word) when hd in @vowels, do: ay(word)
defp translate_word([hd, x | _rest] = word) when hd in ~w(x y) and x not in @vowels, do: ay(word)
defp translate_word([hd | rest]), do: translate_word(rest ++ [hd])
@spec ay(word :: [String.t()]) :: [String.t()]
defp ay(list), do: list ++ ~w(ay)
end

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elixir/pig-latin/mix.exs Normal file
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defmodule PigLatin.MixProject do
use Mix.Project
def project do
[
app: :pig_latin,
version: "0.1.0",
# elixir: "~> 1.8",
start_permanent: Mix.env() == :prod,
deps: deps()
]
end
# Run "mix help compile.app" to learn about applications.
def application do
[
extra_applications: [:logger]
]
end
# Run "mix help deps" to learn about dependencies.
defp deps do
[
# {:dep_from_hexpm, "~> 0.3.0"},
# {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
]
end
end

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defmodule PigLatinTest do
use ExUnit.Case
describe "ay is added to words that start with vowels" do
test "word beginning with a" do
assert PigLatin.translate("apple") == "appleay"
end
test "word beginning with e" do
assert PigLatin.translate("ear") == "earay"
end
test "word beginning with i" do
assert PigLatin.translate("igloo") == "iglooay"
end
test "word beginning with o" do
assert PigLatin.translate("object") == "objectay"
end
test "word beginning with u" do
assert PigLatin.translate("under") == "underay"
end
test "word beginning with a vowel and followed by a qu" do
assert PigLatin.translate("equal") == "equalay"
end
end
describe "first letter and ay are moved to the end of words that start with consonants" do
test "word beginning with p" do
assert PigLatin.translate("pig") == "igpay"
end
test "word beginning with k" do
assert PigLatin.translate("koala") == "oalakay"
end
test "word beginning with x" do
assert PigLatin.translate("xenon") == "enonxay"
end
test "word beginning with q without a following u" do
assert PigLatin.translate("qat") == "atqay"
end
end
describe "some letter clusters are treated like a single consonant" do
test "word beginning with ch" do
assert PigLatin.translate("chair") == "airchay"
end
test "word beginning with qu" do
assert PigLatin.translate("queen") == "eenquay"
end
test "word beginning with qu and a preceding consonant" do
assert PigLatin.translate("square") == "aresquay"
end
test "word beginning with th" do
assert PigLatin.translate("therapy") == "erapythay"
end
test "word beginning with thr" do
assert PigLatin.translate("thrush") == "ushthray"
end
test "word beginning with sch" do
assert PigLatin.translate("school") == "oolschay"
end
end
describe "some letter clusters are treated like a single vowel" do
test "word beginning with y, followed by a consonant" do
assert PigLatin.translate("yttria") == "yttriaay"
end
test "word beginning with xr" do
assert PigLatin.translate("xray") == "xrayay"
end
end
describe "position of y in a word determines if it is a consonant or a vowel" do
test "y is treated like a consonant at the beginning of a word" do
assert PigLatin.translate("yellow") == "ellowyay"
end
test "y is treated like a vowel at the end of a consonant cluster" do
assert PigLatin.translate("rhythm") == "ythmrhay"
end
test "y as second letter in two letter word" do
assert PigLatin.translate("my") == "ymay"
end
end
describe "phrases are translated" do
test "a whole phrase" do
assert PigLatin.translate("quick fast run") == "ickquay astfay unray"
end
end
end

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ExUnit.start()
ExUnit.configure(exclude: :pending, trace: true)