/// <summary>
/// Add a rule to the rules collection for the stemmer.
/// </summary>
/// <param name="rule">The rule to add.</param>
public void AddRule(StemRule rule)
{
_rules.Add(rule);
}
/// <summary>
/// Apply a rule to a stem to create a new stem.
/// </summary>
/// <param name="stem">The stem to apply the rule to.</param>
/// <param name="rule">The rule to apply to the stem.</param>
/// <returns>A new stem.</returns>
private string ApplyRule(string stem, StemRule rule)
{
return stem.Substring(0, stem.Length - rule.Ending.Length) + rule.Replacement;
}
/// <summary>
/// Check if a rule can be applied to a stem.
/// </summary>
/// <remarks>
/// The application of a rule to a stem may not always result
/// in a stem that makes sense linguistically. This check is
/// an attempt to reduce the error in the stemming process.
/// </remarks>
/// <param name="stem">The stem to check application against.</param>
/// <param name="rule">The rule to check.</param>
/// <returns>True if the rule can be applied, false otherwise.</returns>
private bool CanApplyRule(string stem, StemRule rule)
{
string newStem = ApplyRule(stem, rule);
return WordContainsVowel(newStem);
}
