modules/UniSyn_phonology/subword.cc

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/*                                                                       */
/*                Centre for Speech Technology Research                  */
/*                     University of Edinburgh, UK                       */
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/*************************************************************************/
/*             Author :  Alan W Black and Paul Taylor                    */
/*             Date   :  February 1998                                   */
/*-----------------------------------------------------------------------*/
/*                                                                       */
/*  An implementation of Metrical Tree Phonology                         */
/*                                                                       */
/*=======================================================================*/

#include "festival.h"

void main_stress(EST_Item *s);

void subword_metrical_tree(EST_Relation &syllable,
			   EST_Relation &metricaltree);

EST_Item *make_foot(EST_Item *w, EST_Item *met_node, EST_Item *next_syl_node);
void subword_metrical_tree(EST_Item *w, EST_Relation &syllable,
			   EST_Relation &metricaltree);

static void all_stress(EST_Relation &syllable, EST_Relation &mettree);

static void make_super_foot(EST_Item *w, EST_Item *met_node,
			    EST_Item *next_syl_node);

// Note: this function doesn't work as it should: currently a
// monosyllabic word ends up being the same item as the syllable, when
// a single daughter item would be better.

void subword_list(EST_Item *w, EST_Relation &syllable,
		  EST_Relation &metricaltree)
{
    EST_Item *s, *n;

    n = metricaltree.append(w);

    if (next(syllable.head()) == 0)
	return;

    for (s = syllable.head(); s ; s = s->next())
    {
	cout << "appending syl\n";
	n->append_daughter(s);
    }
}

void subword_metrical_tree(EST_Item *w, EST_Relation &syllable,
			   EST_Relation &metricaltree)
{
    EST_Item *s;
    EST_Item *new_leaf;

    // single syllable
    if (next(syllable.head()) == 0)
    {
	new_leaf = metricaltree.append(w);
	return;
    }

    // absorb initial unstressed syllables
    for (s = syllable.head(); s && (s->f("stress_num") == 0); s = s->next())
    {
	new_leaf = metricaltree.append(s);
	new_leaf->set("MetricalValue", "w");
    }

    while (s)
    {
	new_leaf = metricaltree.append(s);
	new_leaf->set("MetricalValue", "s");
	s = make_foot(w, new_leaf, next(s));
    }

    if (siod_get_lval("mettree_debug", NULL) != NIL)
	metricaltree.utt()->save("foot.utt", "est");

    s = metricaltree.head();
    make_super_foot(w, s, next(s));

    if (siod_get_lval("mettree_debug", NULL) != NIL)
	metricaltree.utt()->save("super_foot.utt", "est");

    all_stress(syllable, metricaltree);
}


EST_Item *make_foot(EST_Item *w, EST_Item *met_node, EST_Item *next_syl_node)
{
    EST_Item *new_parent;
    EST_Item *fl;

    if (next_syl_node == 0)
	return 0;

    if (next_syl_node->f("stress_num") == 0)
    {
	met_node->set("MetricalValue", "s");
	next_syl_node->set("MetricalValue", "w");

	fl = first_leaf(met_node);

	if (next(next_syl_node))
	    new_parent = met_node->insert_parent();
	else
	{
	    if (prev(fl))
		new_parent = met_node->insert_parent();
	    else
	    {
		//		cout << "making met node word node in foot\n";
		//		cout << "foot root:" << *w << endl;
		new_parent = met_node->insert_parent();
//		new_parent = met_node->insert_above(w);
		merge_item(new_parent, w);
		//		cout << "foot root:" << *w << endl;
		//		cout << "foot root:" << *new_parent << endl;
	    }

	}
	new_parent->append_daughter(next_syl_node);

	next_syl_node = make_foot(w, new_parent, next(next_syl_node));
    }
    return next_syl_node;
}

// construct left branching unlabelled tree using feet roots as terminals
static void make_super_foot(EST_Item *w, EST_Item *met_node,
			    EST_Item *next_syl_node)
{
    EST_Item *new_parent;

    if (next_syl_node == 0)
	return;

    // make sure root node is w, i.e. word
    if (next(next_syl_node))
	new_parent = met_node->insert_parent();
    else
    {
	//	cout << "inserted word as root in super foot:" << *w << endl;
	new_parent = met_node->insert_parent();

	// KTH this crashes in linux
	merge_item(new_parent, w);
	//	cout << "after inserted word as root in super foot:" << *w << endl;
	//	cout << "after inserted word as root in super foot:" <<
	//	*new_parent << endl;
	//	w = new_parent->as_relation("Word");
    }

    new_parent->append_daughter(next_syl_node);

    make_super_foot(w, new_parent, next(new_parent));
}


static void all_stress(EST_Relation &syllable, EST_Relation &mettree)
{
    EST_Item *n, *s;
    int stress_num = -1;

    for (s = syllable.head(); s; s = s->next())
	if (s->I("stress_num",0) > stress_num)
	    stress_num = s->I("stress_num");

    //    cout << "max stress num:" << stress_num << endl;

    for (; stress_num > 0; --stress_num)
    {
	for (s = syllable.head(); s; s = s->next())
	    if (s->I("stress_num",0) == stress_num)
		break;

	if (s == 0)
	{
	    cerr << "No main stress found in definition of lexical entry\n";
	    festival_error();
	}

	n = s->as_relation(mettree.name());
	main_stress(n);
    }
}