Class: Mittens::Stemmer

Inherits:
Object
  • Object
show all
Defined in:
ext/mittens/ext.c

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object 



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# File 'ext/mittens/ext.c', line 49

static VALUE stemmer_initialize(int argc, VALUE* argv, VALUE self)
{
    stemmer_t* stemmer;
    GetStemmer(self, stemmer);

    if (stemmer->stemmer != NULL)
        rb_raise(rb_eRuntimeError, "stemmer already initialized");

    VALUE opts;
    rb_scan_args(argc, argv, ":", &opts);

    VALUE language = Qnil;
    if (!NIL_P(opts))
        language = rb_hash_aref(opts, ID2SYM(rb_intern("language")));

    // if adding support for encoding, may want to change encoding returned from stem
    stemmer->stemmer = sb_stemmer_new(GetAlgorithm(language), NULL);
    if (stemmer->stemmer == NULL)
    {
        if (!NIL_P(language))
            rb_raise(rb_eArgError, "unknown language: %" PRIsVALUE, language);

        rb_raise(rb_eNoMemError, "failed to allocate memory");
    }

    // copy (after GetAlgorithm) in case string is modified in future
    stemmer->language = rb_obj_dup(language);

    return self;
}

Class Method Details

.languages ⇒ Object 



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# File 'ext/mittens/ext.c', line 122

static VALUE stemmer_languages(VALUE klass)
{
    VALUE out = rb_ary_new();

    const char** language = sb_stemmer_list();
    while (*language != NULL)
        rb_ary_push(out, rb_utf8_str_new_cstr(*language++));

    return out;
}

Instance Method Details

#initialize_copy(orig) ⇒ Object 



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# File 'ext/mittens/ext.c', line 102

static VALUE stemmer_initialize_copy(VALUE self, VALUE orig)
{
    stemmer_t* stemmer;
    GetStemmer(self, stemmer);

    stemmer_t* orig_stemmer;
    GetStemmer(orig, orig_stemmer);

    if (stemmer->stemmer != NULL)
        rb_raise(rb_eRuntimeError, "stemmer already initialized");

    stemmer->stemmer = sb_stemmer_new(GetAlgorithm(orig_stemmer->language), NULL);
    if (stemmer->stemmer == NULL)
        rb_raise(rb_eNoMemError, "failed to allocate memory");

    stemmer->language = orig_stemmer->language;

    return self;
}

#stem(value) ⇒ Object 



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# File 'ext/mittens/ext.c', line 80

static VALUE stemmer_stem(VALUE self, VALUE value)
{
    stemmer_t* stemmer;
    GetStemmer(self, stemmer);

    if (stemmer->stemmer == NULL)
        rb_raise(rb_eRuntimeError, "stemmer not initialized");

    const char* word = StringValuePtr(value);
    long size = RSTRING_LEN(value);
    if (size > INT_MAX)
        rb_raise(rb_eArgError, "string exceeds max length");

    const sb_symbol* pointer_out = sb_stemmer_stem(stemmer->stemmer, (const sb_symbol*) word, (int) size);
    int length_out = sb_stemmer_length(stemmer->stemmer);

    // place after last use of word
    RB_GC_GUARD(value);

    return rb_utf8_str_new((char*) pointer_out, (long) length_out);
}