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SpanishSnowballStemmer.Stem

The Snowball stem of one Spanish word.

public static string Stem(string word)

Parameters — word is a single Spanish word. It is lowercased and NFC-normalised before the rules run.

Returns — string, the stem, always lowercase.

Exceptions — ArgumentNullException when word is null. An empty string, or a word of one character, is returned lowercased and otherwise untouched.

Example — an attached pronoun removed, and the same word with and without its accent.

using Lodestar.Text.Stemming;

string gerund = SpanishSnowballStemmer.Stem("cantándome");  // => cant
string infinitive = SpanishSnowballStemmer.Stem("cantar");  // => cant
string accented = SpanishSnowballStemmer.Stem("dámelo");  // => damel
string plain = SpanishSnowballStemmer.Stem("damelo");  // => damel

Remarks — cantándome reaching the same cant as cantar is step 0 and the verb rules in sequence: -me goes first as an attached pronoun, then -ándo as a gerund ending. Neither would have fired without the other, which is why the pronoun step has to come first.

dámelo and damelo agreeing matters for real corpora, where accents are dropped often enough that treating the two spellings as different terms would split a term's postings in half.

The one thing this method does not do is disambiguate: the gerund forms of hacer all reach hac, which names nothing on its own. Stems are compared, not read.

Applies to — net10.0, netstandard2.0.

See also — SpanishSnowballStemmer, the stemming index.