To inflect present into past participles.

• §1. Constructing past participles
• §2. The pasturising trie

§1. Constructing past participles. For example, "turning away" to "turned away".

wording PastParticiples::pasturise_wording(wording W) {
    TEMPORARY_TEXT(pasturised)
    TEMPORARY_TEXT(from)
    feed_t id = Feeds::begin();
    LOOP_THROUGH_WORDING(i, W) {
        WRITE_TO(from, "%W", Wordings::one_word(i));
        if (Str::get_first_char(from) == '\"') WRITE_TO(pasturised, "some-long-text");
        else {
            if (PastParticiples::pasturise_text(pasturised, from)) {
                if (i > Wordings::first_wn(W)) Feeds::feed_wording(Wordings::up_to(W, i-1));
                Feeds::feed_text(pasturised);
                if (i < Wordings::last_wn(W)) Feeds::feed_wording(Wordings::from(W, i+1));
                break;
            }
        }
    }
    wording PLW = Feeds::end(id);
    LOGIF(CONSTRUCTED_PAST_PARTICIPLES, "[Past participle of %W is %W]\n", W, PLW);
    DISCARD_TEXT(from)
    DISCARD_TEXT(pasturised)
    return PLW;
}

§2. The pasturising trie. This is the process of turning a present participle, like "turning", to a past participle, like "turned". Note that it returns NULL if it fails to recognise the word in question as a present participle; this is needed above. It expects only a single word.

int PastParticiples::pasturise_text?Usage of PastParticiples::pasturise_text:
§1(OUTPUT_STREAM, text_stream *from) {
    match_avinue *past_trie =
        PreformUtilities::define_trie(<pasturise-participle>, TRIE_START,
            DefaultLanguage::get(NULL));
    return Inflect::suffix(OUT, past_trie, from);
}