/// <summary>Based on a bunch of weird irregular rules of mostly phonology, decide whether this indefinite article should be "a" or "an"</summary>
/// <param name="followingWordBuilder">The word that comes after this article</param>
private static string AppropriateIndefiniteArticleToPrecede(WordElementBuilder followingWordBuilder)
{
if (followingWordBuilder == null)
{
return("a");
}
else
{
string followingWord = followingWordBuilder.SelectWord();
var lowercaseWord = followingWord.ToLower();
foreach (string anword in new string[] { "euler", "heir", "honest", "hono" })
{
if (lowercaseWord.StartsWith(anword))
{
return("an");
}
}
if (lowercaseWord.StartsWith("hour") && !lowercaseWord.StartsWith("houri"))
{
return("an");
}
if (lowercaseWord.StartsWith("one ") || lowercaseWord.StartsWith("one-"))
{
return("a");
}
var char_list = new char[] { 'a', 'e', 'd', 'h', 'i', 'l', 'm', 'n', 'o', 'r', 's', 'x' };
if (lowercaseWord.Length == 1)
{
if (lowercaseWord.IndexOfAny(char_list) == 0)
{
return("an");
}
else
{
return("a");
}
}
if (Regex.Match(followingWord, "(?!FJO|[HLMNS]Y.|RY[EO]|SQU|(F[LR]?|[HL]|MN?|N|RH?|S[CHKLMNPTVW]?|X(YL)?)[AEIOU])[FHLMNRSX][A-Z]").Success)
{
return("an");
}
foreach (string regex in new string[] { "^e[uw]", "^onc?e\b", "^uni([^nmd]|mo)", "^u[bcfhjkqrst][aeiou]" })
{
if (Regex.IsMatch(lowercaseWord, regex))
{
return("a");
}
}
if (Regex.IsMatch(followingWord, "^U[NK][AIEO]"))
{
return("a");
}
else if (followingWord == followingWord.ToUpper())
{
if (lowercaseWord.IndexOfAny(char_list) == 0)
{
return("an");
}
else
{
return("a");
}
}
if (lowercaseWord.IndexOfAny(new char[] { 'a', 'e', 'i', 'o', 'u' }) == 0)
{
return("an");
}
if (Regex.IsMatch(lowercaseWord, "^y(b[lor]|cl[ea]|fere|gg|p[ios]|rou|tt)"))
{
return("an");
}
return("a");
}
}
