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to Pig Latin in the C# Track

Published at Jul 18 2018 · 0 comments
Instructions
Test suite
Solution

Implement a program that translates from English to Pig Latin.

Pig Latin is a made-up children's language that's intended to be confusing. It obeys a few simple rules (below), but when it's spoken quickly it's really difficult for non-children (and non-native speakers) to understand.

  • Rule 1: If a word begins with a vowel sound, add an "ay" sound to the end of the word.
  • Rule 2: If a word begins with a consonant sound, move it to the end of the word, and then add an "ay" sound to the end of the word.

There are a few more rules for edge cases, and there are regional variants too.

See http://en.wikipedia.org/wiki/Pig_latin for more details.

Source

The Pig Latin exercise at Test First Teaching by Ultrasaurus https://github.com/ultrasaurus/test-first-teaching/blob/master/learn_ruby/pig_latin/

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

PigLatinTest.cs

// This file was auto-generated based on version 1.2.0 of the canonical data.

using Xunit;

public class PigLatinTest
{
    [Fact]
    public void Word_beginning_with_a()
    {
        Assert.Equal("appleay", PigLatin.Translate("apple"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_e()
    {
        Assert.Equal("earay", PigLatin.Translate("ear"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_i()
    {
        Assert.Equal("iglooay", PigLatin.Translate("igloo"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_o()
    {
        Assert.Equal("objectay", PigLatin.Translate("object"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_u()
    {
        Assert.Equal("underay", PigLatin.Translate("under"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_a_vowel_and_followed_by_a_qu()
    {
        Assert.Equal("equalay", PigLatin.Translate("equal"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_p()
    {
        Assert.Equal("igpay", PigLatin.Translate("pig"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_k()
    {
        Assert.Equal("oalakay", PigLatin.Translate("koala"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_x()
    {
        Assert.Equal("enonxay", PigLatin.Translate("xenon"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_q_without_a_following_u()
    {
        Assert.Equal("atqay", PigLatin.Translate("qat"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_ch()
    {
        Assert.Equal("airchay", PigLatin.Translate("chair"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_qu()
    {
        Assert.Equal("eenquay", PigLatin.Translate("queen"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_qu_and_a_preceding_consonant()
    {
        Assert.Equal("aresquay", PigLatin.Translate("square"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_th()
    {
        Assert.Equal("erapythay", PigLatin.Translate("therapy"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_thr()
    {
        Assert.Equal("ushthray", PigLatin.Translate("thrush"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_sch()
    {
        Assert.Equal("oolschay", PigLatin.Translate("school"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_yt()
    {
        Assert.Equal("yttriaay", PigLatin.Translate("yttria"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Word_beginning_with_xr()
    {
        Assert.Equal("xrayay", PigLatin.Translate("xray"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Y_is_treated_like_a_consonant_at_the_beginning_of_a_word()
    {
        Assert.Equal("ellowyay", PigLatin.Translate("yellow"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Y_is_treated_like_a_vowel_at_the_end_of_a_consonant_cluster()
    {
        Assert.Equal("ythmrhay", PigLatin.Translate("rhythm"));
    }

    [Fact(Skip = "Remove to run test")]
    public void Y_as_second_letter_in_two_letter_word()
    {
        Assert.Equal("ymay", PigLatin.Translate("my"));
    }

    [Fact(Skip = "Remove to run test")]
    public void A_whole_phrase()
    {
        Assert.Equal("ickquay astfay unray", PigLatin.Translate("quick fast run"));
    }
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

public static class PigLatin
{
    public static string Translate(string word)
    {
        var split = word.Split(" ");
        var list = new List<string>();
        foreach (var w in split)
        {
            list.Add(Replace(w));
        }
        return list.Aggregate("", (x, y) => x + y + " ").Trim();
    }

    private static string Replace(string word)
    {
        return
          Regex.IsMatch(word, @"^([aeiou]|yt|xr)")/*  */ ? Regex.Replace(word, @"^([aeiou]|yt|xr).+", "$0ay")
        : Regex.IsMatch(word, @"^[^aeiou]{2}y")/*     */ ? Regex.Replace(word, @"(..)(.+)", "$2$1ay")
        : Regex.IsMatch(word, @"^.y$") /*              */? Regex.Replace(word, @"(.)y", "y$1ay")
        : Regex.IsMatch(word, @"^[^aeiou](ch|qu)")/*  */ ? Regex.Replace(word, @"(.{3})(.+)", "$2$1ay")
        : Regex.IsMatch(word, @"^(ch|qu|thr|th)") /*  */ ? Regex.Replace(word, @"(ch|qu|thr|th)(.+)", "$2$1ay")
        : Regex.IsMatch(word, @"^[^aeiou]") /*         */? Regex.Replace(word, @"^([^aeiou])(.+)", "$2$1ay")
        : throw new ArgumentException();
    }
}

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