/// <summary>
/// Recursively creates a phrase structure tree with the given word set and Lexicon.
/// </summary>
/// <param name="d">The lexicon with definitions to use</param>
/// <param name="terminals">The phrase to generate a tree with</param>
/// <returns>A phrase structure tree representing the hierarchy of structures of the sentence.</returns>
private static Phrase merge(Terminal[] terminals)
{
Terminal leftTerminal = terminals[0];
// Base case
if (terminals.Length == 1)
{
Intermediate i = new Intermediate(leftTerminal);
return new Phrase(i);
}
else if (terminals.Length == 2)
{
switch (terminals[0].Category)
{
case LexicalCategory.Determiner:
return new Phrase(new Phrase(new Intermediate(terminals[0])), new Intermediate(terminals[1]));
}
}
Intermediate intermediate = new Intermediate(leftTerminal, merge(terminals.Skip(1).ToArray()));
return new Phrase(intermediate);
}
/// <summary>
/// Creates a new instance of <c>Phrase</c> and sets the <see cref="Intermediate"/> and <see cref="Specifier"/>.
/// </summary>
/// <param name="specifier">The speicifer phrase.</param>
/// <param name="i">The Intermediate phrase.</param>
public Phrase(Phrase specifier, Intermediate i)
{
Specifier = specifier;
Intermediate = i;
}
/// <summary>
/// Creates a new instance of <c>Phrase</c> and sets the <see cref="Intermediate"/>
/// </summary>
/// <param name="i">The Intermediate phrase.</param>
public Phrase(Intermediate i)
{
Intermediate = i;
}
