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eltabei's solution

to Pig Latin in the C# Track

Published at Jul 13 2018 · 4 comments
Instructions
Test suite
Solution

Note:

This solution was written on an old version of Exercism. The tests below might not correspond to the solution code, and the exercise may have changed since this code was written.

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.Text.RegularExpressions;

public class PigLatin
{
    public static string Translate(string line)
    {
        string res = string.Empty;
        foreach (string word in line.Split())
        {
            res += TranslateWord(word) + " ";
        }
        return res.Trim();
    }

    public static string TranslateWord(string word)
    {
        word = word.ToLower();
        Regex r1 = new Regex("^([aeiou]|yt|xr)[a-z]+$");
        Regex r2 = new Regex("^(thr?|sch|ch|qu|[^aeiou](qu)?)([a-z]+)$");
        if (r1.IsMatch(word))
        {
            return word + "ay";
        }
        if (r2.IsMatch(word))
        {
            Match m = r2.Match(word);
            return m.Groups[3].Value + m.Groups[1].Value + "ay";
        }
        throw new ArgumentException();
    }
}

Community comments

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Avatar of martinfreedman

Aha I can learn from this!

Avatar of ErikSchierboom

At the moment, you use the Split() method to translate each word. You could also do this within your Regex. The key thing to note is that you can do a conditional statement that says: either this is the begin of the line or a space. You do that using the following Regex: (^|\s+). This would allow you to match all words at once, although you might argue that doing it on a word-by-word basis is perhaps more clear.

Avatar of eltabei
eltabei
Solution Author
commented over 5 years ago

Do you mean splitting by Regex? If so, string.Split() with no argument given splits by whitespace, \s, which includes spaces, and new lines.

Avatar of ErikSchierboom

@eltabei Yes, I mean the Split, which indeed splits by whitespace, but considering you already use regular expressions, you can do that in the Regex itself. See my submission for an example.

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