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EST_Relation_mls.cc
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2 /* */
3 /* Centre for Speech Technology Research */
4 /* University of Edinburgh, UK */
5 /* Copyright (c) 1999 */
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32 /*************************************************************************/
33 /* Author : Alan W Black */
34 /* Date : April 1999 */
35 /*-----------------------------------------------------------------------*/
36 /* Multi-linear list relations */
37 /* */
38 /* These are to allow to linear list relations to have relations */
39 /* between one item in one list and a list of items in the other */
40 /* */
41 /* */
42 /* Ehh I'll explain how I do this once its done */
43 /* */
44 /* */
45 /*=======================================================================*/
46 #include <cstdlib>
47 #include <cstdio>
48 #include "ling_class/EST_Item.h"
49 
50 int linked(EST_Item *from, EST_Item *to)
51 {
52  EST_Item *i;
53 
54  for (i=link1(from); i; i=next_link(i))
55  if (i == to)
56  return TRUE;
57 
58  return FALSE;
59 }
60 
61 void add_link(EST_Item *from, EST_Item *to)
62 {
63  EST_Item *d,*q;
64 
65  // structurally add it
66  d = from->down();
67  if (!d)
68  d = from->append_daughter();
69  q = d->append_daughter()->append_daughter(to);
70  // Also add it to the simple list of the relation so traversal works
71  // append q
72 
73 }
74 
75 #if 0
76 /* nope all wrong */
77 static void mls_insert_up(EST_Item *c,EST_Item *d)
78 {
79  if (c->up() == 0)
80  c->insert_above(d);
81  else
82  c->up()->last()->insert_after(d);
83 }
84 
85 static void mls_insert_below(EST_Item *c,EST_Item *d)
86 {
87  if (c->down() == 0)
88  c->insert_below(d);
89  else
90  c->down()->last()->insert_after(d);
91 }
92 
93 static void mls_linked_down(EST_Item *c,EST_Item *d)
94 {
95  return in_list(d,c->down());
96 }
97 
98 static void mls_linked_up(EST_Item *c,EST_Item *d)
99 {
100  return in_list(d,c->up());
101 }
102 
103 int link_items(EST_Relation *mlsrel,EST_Item *i1, EST_item *i2)
104 {
105  if ((i1->in_relation(mlsrel->name())) &&
106  (i2->in_relation(mlsrel->name())))
107  {
108  EST_error("can't link two items already in %s\n",
109  (const char *)mlsrel->name());
110  return FALSE;
111  }
112  else if (i1->in_relation(mlsrel->name()))
113  {
114  EST_Item *c = mls_cluster(as(i1,mlsrel->name()));
115  if (mls_linked_down(c,i1))
116  mls_insert_up(c,i2);
117  else
118  mls_insert_down(c,i2);
119  }
120  else if (i2->in_relation(mlsrel->name()))
121  {
122  EST_Item *c = mls_cluster(as(i2,mlsrel->name()));
123  if (mls_linked_down(c,i2))
124  mls_insert_up(c,i1);
125  else
126  mls_insert_down(c,i1);
127  }
128  else
129  {
130  // neither in MLS so create new cluster
131  EST_Item *c = mlsrel->append();
132  mls_insert_linked_up(c,i1);
133  mls_insert_linked_down(c,i1);
134  }
135  return TRUE;
136 }
137 #endif
138 
139 void remove_link(EST_Item *from, EST_Item *to)
140 {
141  (void)from;
142  (void)to;
143 
144  fprintf(stderr,"remove_link not written yet\n");
145 }
146