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source: cpp/frams/genetics/f4/f4_oper.cpp @ 918

Last change on this file since 918 was 899, checked in by Maciej Komosinski, 5 years ago
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1	// This file is a part of Framsticks SDK. http://www.framsticks.com/
2	// Copyright (C) 1999-2017 Maciej Komosinski and Szymon Ulatowski.
3	// See LICENSE.txt for details.
4
5	// Copyright (C) 1999,2000 Adam Rotaru-Varga (adam_rotaru@yahoo.com), GNU LGPL
6	// Copyright (C) since 2001 Maciej Komosinski
7	// 2018, Grzegorz Latosinski, added support for new API for neuron types and their properties
8
9	#include "f4_oper.h"
10	#include <frams/util/sstring.h>
11	#include <common/log.h>
12
13	#include <stdio.h>
14	#include <stdlib.h>
15	#include "common/nonstd_math.h"
16	#include <string.h>
17
18
19	const char *Geno_f4::all_modifiers = F14_MODIFIERS ","; //comma in f4 is handled the same way (simple node, F4_ADD_SIMP) as modifiers
20
21	// codes that can be changed (apart from being added/deleted)
22	#define MUT_CHAN_CODES "<[#"
23	#define REP_MAXCOUNT 19
24
25	#define FIELDSTRUCT Geno_f4
26
27	static ParamEntry GENO4param_tab[] =
28	{
29	{ "Genetics: f4", 1, F4_COUNT + F4_ADD_COUNT + 1, },
30	{ "f4_mut_add", 0, 0, "Add node", "f 0 100 50", FIELD(prob[F4_ADD]), "mutation: probability of adding a node", },
31	{ "f4_mut_add_div", 0, 0, "- add division", "f 0 100 20", FIELD(probadd[F4_ADD_DIV]), "add node mutation: probability of adding a division", },
32	{ "f4_mut_add_conn", 0, 0, "- add connection", "f 0 100 15", FIELD(probadd[F4_ADD_CONN]), "add node mutation: probability of adding a neural connection", },
33	{ "f4_mut_add_neupar", 0, 0, "- add neuron property", "f 0 100 5", FIELD(probadd[F4_ADD_NEUPAR]), "add node mutation: probability of adding a neuron property/modifier", },
34	{ "f4_mut_add_rep", 0, 0, "- add repetition", "f 0 100 10", FIELD(probadd[F4_ADD_REP]), "add node mutation: probability of adding a repetition", },
35	{ "f4_mut_add_simp", 0, 0, "- add simple node", "f 0 100 50", FIELD(probadd[F4_ADD_SIMP]), "add node mutation: probability of adding a random, simple gene", },
36	{ "f4_mut_del", 0, 0, "Delete node", "f 0 100 20", FIELD(prob[F4_DEL]), "mutation: probability of deleting a node", },
37	{ "f4_mut_mod", 0, 0, "Modify node", "f 0 100 30", FIELD(prob[F4_MOD]), "mutation: probability of changing a node", },
38	{ "f4_mut_exmod", 1, 0, "Excluded modifiers", "s 0 30", FIELD(excluded_modifiers), "Modifiers that will not be added nor deleted during mutation\n(all: " F14_MODIFIERS ")", },
39	{ 0, },
40	};
41
42	#undef FIELDSTRUCT
43
44
45	Geno_f4::Geno_f4()
46	{
47	supported_format = '4';
48	par.setParamTab(GENO4param_tab);
49	par.select(this);
50	par.setDefault();
51
52	mutation_method_names = new const char*[F4_COUNT + F4_ADD_COUNT - 1];
53	int index = 0;
54	mutation_method_names[index++] = "added division";
55	mutation_method_names[index++] = "added neural connection";
56	mutation_method_names[index++] = "added neuron property";
57	mutation_method_names[index++] = "added repetition gene";
58	mutation_method_names[index++] = "added a simple node";
59	mutation_method_names[index++] = "deleted a node";
60	mutation_method_names[index++] = "modified a node";
61	if (index != F4_COUNT + F4_ADD_COUNT - 1) logMessage("Geno_f4", "Constructor", 3, "Mutation names init error");
62	}
63
64	void Geno_f4::setDefaults()
65	{
66	excluded_modifiers = F14_MODIFIERS_RARE F14_MODIFIERS_VISUAL;
67	}
68
69	int Geno_f4::ValidateRec(f4_node *geno, int retrycount) const
70	{
71	// ! the genotype is geno->child (not geno) !
72	// build from it with repair on
73
74	f4_Cells cells(geno->child, 1);
75	cells.simulate(); //we should simulate?!
76
77	// errors not fixed:
78	if (GENOPER_OPFAIL == cells.geterror())
79	{
80	if (cells.geterrorpos() >= 0) return 1 + cells.geterrorpos();
81	return GENOPER_OPFAIL;
82	}
83	// errors can be fixed
84	if (GENOPER_REPAIR == cells.geterror())
85	{
86	cells.repairGeno(geno, 1);
87	// note: geno might have been fixed
88	// check again
89	int res2 = GENOPER_OK;
90	if (retrycount > 0)
91	res2 = ValidateRec(geno, retrycount - 1);
92
93	if (res2 == GENOPER_OK) return GENOPER_REPAIR;
94	return res2;
95	}
96	// no errors:
97	return GENOPER_OK;
98	}
99
100
101	int Geno_f4::validate(char & geno, const char genoname)
102	{
103	// convert geno to tree, then try to validate 20 times
104	f4_node root;
105	if (f4_processrec(geno, 0, &root) \|\| root.childCount() != 1) return GENOPER_OK; // cannot repair
106	if (ValidateRec(&root, 20) == GENOPER_REPAIR) // if repaired, make it back to string
107	{
108	geno[0] = 0;
109	root.child->sprintAdj(geno);
110	}
111	return GENOPER_OK;
112	}
113
114
115	int Geno_f4::checkValidity(const char* geno, const char *genoname)
116	{
117	f4_node root;
118	int res = f4_processrec(geno, 0, &root);
119	if (res) return res; // errorpos, >0
120	if (root.childCount() != 1) return 1; //earlier: GENOPER_OPFAIL
121	f4_Cells cells(root.child, 0);
122	cells.simulate();
123	if (cells.geterror() == GENOPER_OPFAIL \|\| cells.geterror() == GENOPER_REPAIR)
124	{
125	if (cells.geterrorpos() >= 0) return 1 + cells.geterrorpos();
126	else return 1; //earlier: GENOPER_OPFAIL;
127	}
128	else return GENOPER_OK;
129	}
130
131
132	int Geno_f4::MutateOne(f4_node *& g, int &method) const
133	{
134	// ! the genotype is g->child (not g) !
135
136	// do the mutation
137	// pick a random node
138	f4_node *n1 = g->child->randomNode();
139	vector<NeuroClass*> neulist;
140	//DB( printf("%c\n", n1->name); )
141	int neuronid = -1;
142
143	switch (roulette(prob, F4_COUNT))
144	{
145	case F4_ADD:
146	{
147	// add a node
148	switch (method = roulette(probadd, F4_ADD_COUNT))
149	{
150	case F4_ADD_DIV:
151	{
152	// add division ('<')
153	f4_node *n3 = n1->parent;
154	n3->removeChild(n1);
155	f4_node *n2 = new f4_node('<', n3, n3->pos);
156	n2->addChild(n1);
157	// new cell is stick or neuron
158	// "X>" or "N>"
159	f4_node *n5 = NULL;
160	double pr = rndDouble(1);
161	pr -= 0.5;
162	if (pr < 0) n5 = new f4_node('X', n2, n2->pos);
163	else
164	{
165	// make neuron
166	NeuroClass *rndclass = GenoOperators::getRandomNeuroClass();
167	if (rndclass == NULL)
168	{
169	n5 = new f4_node('X', n2, n2->pos);
170	}
171	else
172	{
173	f4_node *n4 = new f4_node(rndclass->getName().c_str(), n2, n2->pos);
174	if (rndclass->getPreferredInputs() != 0)
175	{
176	neuronid = -1;
177	for (int i = 0; i < g->count(); i++)
178	{
179	f4_node *gcur = g->ordNode(i);
180	char* temp = (char*)gcur->name.c_str();
181	NeuroClass *neuclass = GenoOperators::parseNeuroClass(temp);
182	if (neuclass != NULL)
183	{
184	neulist.push_back(neuclass);
185	}
186	if (g->ordNode(i) == n3)
187	{
188	neuronid = neulist.size() - 1;
189	}
190	}
191	if (neuronid == -1)
192	{
193	return GENOPER_OPFAIL;
194	}
195	n5 = new f4_node('[', n4, n2->pos);
196	linkNodeMakeRandom(n5, neuronid, neulist);
197	}
198	else {
199	n5 = n4;
200	}
201	}
202	}
203	new f4_node('>', n5, n5->pos);
204	n1->parent = n2;
205	// now with 50% chance swap children
206	if (rndUint(2) == 0)
207	{
208	n3 = n2->child;
209	n2->child = n2->child2;
210	n2->child2 = n3;
211	}
212	}
213	break;
214	case F4_ADD_CONN:
215	{
216	// add link
217	f4_node *par = n1->parent;
218	char* temp = (char*)par->name.c_str();
219	NeuroClass *neuclass = GenoOperators::parseNeuroClass(temp);
220	if (neuclass != NULL)
221	{
222	n1->parent->removeChild(n1);
223	f4_node *n2 = new f4_node('[', n1->parent, n1->parent->pos);
224	n2->addChild(n1);
225	n1->parent = n2;
226	neuronid = -1;
227	for (int i = 0; i < g->count(); i++)
228	{
229	f4_node *gcur = g->ordNode(i);
230	temp = (char*)gcur->name.c_str();
231	NeuroClass *neuclass = GenoOperators::parseNeuroClass(temp);
232	if (neuclass != NULL)
233	{
234	neulist.push_back(neuclass);
235	}
236	if (gcur == par)
237	{
238	neuronid = neulist.size() - 1;
239	}
240	}
241	if (neuronid == -1)
242	{
243	return GENOPER_OPFAIL;
244	}
245	linkNodeMakeRandom(n2, neuronid, neulist);
246	}
247	}
248	break;
249	case F4_ADD_NEUPAR:
250	{
251	// add neuron modifier
252	n1->parent->removeChild(n1);
253	f4_node *n2 = new f4_node(':', n1->parent, n1->parent->pos);
254	nparNodeMakeRandom(n2);
255	n2->addChild(n1);
256	n1->parent = n2;
257	}
258	break;
259	case F4_ADD_REP:
260	{
261	// add repetition ('#')
262	// repeated code (left child) is the original, right child is empty, count is 2
263	f4_node *n3 = n1->parent;
264	n3->removeChild(n1);
265	f4_node *n2 = new f4_node('#', n3, n3->pos);
266	n2->i1 = 2;
267	n2->addChild(n1);
268	new f4_node('>', n2, n2->pos);
269	n1->parent = n2;
270	}
271	break;
272	case F4_ADD_SIMP:
273	{
274	// add simple node
275	// choose a simple node from ADD_SIMPLE_CODES
276	n1->parent->removeChild(n1);
277	//f4_node *n2 = new f4_node(ADD_SIMPLE_CODES[rndUint(strlen(ADD_SIMPLE_CODES))], n1->parent, n1->parent->pos);
278	int modifierid = GenoOperators::getRandomChar(all_modifiers, excluded_modifiers.c_str());
279	f4_node *n2 = new f4_node(all_modifiers[modifierid], n1->parent, n1->parent->pos);
280	n2->addChild(n1);
281	n1->parent = n2;
282	}
283	break;
284	}
285	}
286	break;
287
288	case F4_DEL:
289	{
290	method = F4_ADD_COUNT - 1 + F4_DEL;
291	// delete a node
292	// must pick a node with parent, and at least one child
293	// already picked a node, but repeat may be needed
294	for (int i = 0; i < 10; i++)
295	{
296	if ((NULL != n1->parent) && (g != n1->parent))
297	if (NULL != n1->child)
298	break;
299	// try a new one
300	n1 = g->child->randomNode();
301	}
302	if ((NULL != n1->parent) && (g != n1->parent))
303	{
304	switch (n1->childCount())
305	{
306	case 0: break;
307	case 1: // one child
308	{
309	f4_node *n2 = n1->parent;
310	n2->removeChild(n1);
311	if (NULL != n1->child)
312	{
313	n1->child->parent = n2;
314	n2->addChild(n1->child);
315	n1->child = NULL;
316	}
317	if (NULL != n1->child2)
318	{
319	n1->child2->parent = n2;
320	n2->addChild(n1->child2);
321	n1->child2 = NULL;
322	}
323	// destroy n1
324	n1->parent = NULL;
325	delete n1;
326	}
327	break;
328
329	case 2: // two children
330	{
331	// two children
332	f4_node *n2 = n1->parent;
333	n2->removeChild(n1);
334	// n1 has two children. pick one randomly 50-50, destroy other
335	if (rndUint(2) == 0)
336	{
337	n1->child->parent = n2;
338	n2->addChild(n1->child);
339	n1->child = NULL;
340	n1->child2->parent = NULL;
341	}
342	else
343	{
344	n1->child2->parent = n2;
345	n2->addChild(n1->child2);
346	n1->child2 = NULL;
347	n1->child->parent = NULL;
348	}
349	// destroy n1
350	n1->parent = NULL;
351	delete n1;
352	}
353	break;
354	}
355	}
356	else return GENOPER_OPFAIL;
357	}
358	break;
359	case F4_MOD:
360	{
361	method = F4_ADD_COUNT - 1 + F4_MOD;
362	// change a node
363	// the only nodes that are modifiable are MUT_CHAN_CODES
364	// try to get a modifiable node
365	// already picked a node, but repeat may be needed
366	int i = 0;
367	while (1)
368	{
369	if (strchr(MUT_CHAN_CODES, n1->name[0])) break;
370	// try a new one
371	n1 = g->child->randomNode();
372	i++;
373	if (i >= 20) return GENOPER_OPFAIL;
374	}
375	switch (n1->name[0])
376	{
377	case '<':
378	{
379	// swap children
380	f4_node *n2 = n1->child; n1->child = n1->child2; n1->child2 = n2;
381	}
382	break;
383	case '[':
384	{
385	neuronid = -1;
386	for (int i = 0; i < g->count(); i++)
387	{
388	f4_node *gcur = g->ordNode(i);
389	char temp = (char)gcur->name.c_str();
390	NeuroClass *neuclass = GenoOperators::parseNeuroClass(temp);
391	if (neuclass != NULL)
392	{
393	neulist.push_back(neuclass);
394	}
395	if (gcur == n1)
396	{
397	neuronid = neulist.size() - 1;
398	}
399	}
400	if (neuronid == -1)
401	{
402	return GENOPER_OPFAIL;
403	}
404	linkNodeChangeRandom(n1, neuronid, neulist);
405	}
406	break;
407
408	case '#':
409	{
410	repeatNodeChangeRandom(n1);
411	}
412	break;
413	}
414	}
415	break;
416
417	default: //no mutations allowed?
418	return GENOPER_OPFAIL;
419	}
420
421	return GENOPER_OK;
422	}
423
424	// make a random [ node
425	void Geno_f4::linkNodeMakeRandom(f4_node nn, int neuid, vector<NeuroClass> neulist) const
426	{
427	float prob1;
428	NeuroClass *nc = NULL;
429
430	// 35% chance one of *GTS
431	prob1 = rndDouble(1);
432	prob1 -= 0.35f;
433	if (prob1 < 0)
434	{
435	// '*', 'G', 'T', or 'S', 1/4 chance each
436	nc = GenoOperators::getRandomNeuroClassWithOutputAndNoInputs();
437	}
438	if (nc != NULL)
439	{
440	nn->i1 = 1;
441	nn->s1 = nc->getName().c_str();
442	nn->l1 = 0;
443	}
444	else
445	{
446	// relative input link
447	int id = GenoOperators::getRandomNeuroClassWithOutput(neulist);
448	int relid = neuid - id;
449	nn->l1 = relid;
450	//nn->l1 = (int)(4.0f * (rndDouble(1) - 0.5f));
451	}
452	// weight
453	nn->f1 = GenoOperators::mutateNeuProperty(nn->f1, NULL, -1);
454	//nn->f1 = 10.0f * (rndDouble(1) - 0.5f);
455	}
456
457	// change a [ node
458	void Geno_f4::linkNodeChangeRandom(f4_node nn, int neuid, std::vector<NeuroClass> neulist) const //rewritten by M.K. - should work as before (not tested)
459	{
460	double probs[3] = { 0.1, 0.3, 0.6 };
461	NeuroClass *cl;
462	// 10% change type
463	// 30% change link
464	// 60% change weight
465
466	switch (roulette(probs, 3))
467	{
468	case 0: // change type
469	// 80% for link, 20% for random sensor
470	if (rndDouble(1) < 0.2f)
471	{
472	cl = GenoOperators::getRandomNeuroClassWithOutputAndNoInputs();
473	if (cl != NULL)
474	{
475	nn->i1 = 1;
476	nn->s1 = cl->name.c_str();
477	nn->l1 = 0;
478	}
479	}
480	break;
481	case 1: // change link
482	if (0 == nn->i1) // relative input link
483	{
484	int id = GenoOperators::getRandomNeuroClassWithOutput(neulist);
485	nn->l1 = neuid - id;
486	}
487	//nn->l1 += (int)(2.0f * (rndDouble(1) - 0.5f));
488	break;
489	case 2: // change weight
490	nn->f1 = GenoOperators::mutateNeuProperty(nn->f1, NULL, -1);
491	//nn->f1 += 1.0f * (rndDouble(1) - 0.5f);
492	break;
493	}
494	}
495
496	// make a random : node
497	void Geno_f4::nparNodeMakeRandom(f4_node *nn) const
498	{
499	int sign = (int)rndDouble(2);
500	int param = (int)rndDouble(3);
501	if (param > 2) param = 2;
502	nn->l1 = sign;
503	nn->i1 = "!=/"[param];
504	}
505
506	// change a repeat # node
507	void Geno_f4::repeatNodeChangeRandom(f4_node *nn) const
508	{
509	int count;
510	float prob1;
511
512	// change count
513	count = nn->i1;
514	prob1 = rndDouble(1);
515	if (prob1 < 0.5f) count++;
516	else count--;
517	if (count < 1) count = 1;
518	if (count > REP_MAXCOUNT) count = REP_MAXCOUNT;
519	nn->i1 = count;
520	}
521
522
523	int Geno_f4::MutateOneValid(f4_node *& g, int &method) const
524	// mutate one, until a valid genotype is obtained
525	{
526	// ! the genotype is g->child (not g) !
527	int i, res;
528	f4_node *gcopy = NULL;
529	// try this max 20 times:
530	// copy, mutate, then validate
531
532	for (i = 0; i < 20; i++)
533	{
534	gcopy = g->duplicate();
535
536	res = MutateOne(gcopy, method);
537
538	if (GENOPER_OK != res)
539	{
540	// mutation failed, try again
541	delete gcopy;
542	continue; // for
543	}
544	// try to validate it
545	res = ValidateRec(gcopy, 10);
546	// accept if it is OK, or was repaired
547	if (GENOPER_OK == res)
548	//(GENOPER_REPAIR == res)
549	{
550	// destroy the original one
551	g->destroy();
552	// make it the new one
553	g = gcopy;
554	gcopy->child = NULL;
555	gcopy->child2 = NULL;
556	delete gcopy;
557	res = GENOPER_OK;
558	goto retm1v;
559	}
560	delete gcopy;
561	}
562	// attempts failed
563	res = GENOPER_OPFAIL;
564	retm1v:
565	return res;
566	}
567
568
569	int Geno_f4::mutate(char *& g, float & chg, int &method)
570	{
571	f4_node *root = new f4_node;
572	if (f4_processrec(g, 0, root) \|\| root->childCount() != 1)
573	{
574	delete root;
575	return GENOPER_OPFAIL;
576	} // could not convert or bad: fail
577	// mutate one node, set chg as this percent
578	chg = 1.0 / float(root->child->count());
579	if (MutateOneValid(root, method) != GENOPER_OK)
580	{
581	delete root;
582	return GENOPER_OPFAIL;
583	}
584	// OK, convert back to string
585	g[0] = 0;
586	root->child->sprintAdj(g);
587	delete root;
588	return GENOPER_OK;
589	}
590
591
592	/*
593	int Geno_f4::MutateMany(char *& g, float & chg)
594	// check if original is valid, then
595	// make a number of mutations
596	{
597	int res, n, i;
598	int totNodes = 0;
599	int maxToMut = 0;
600
601	// convert to tree
602	f4_node *root;
603	root = new f4_node();
604	res = f4_processrec(g, 0, root);
605	if (res) {
606	// could not convert, fail
607	goto retm;
608	}
609	if (1 != root->childCount()) {
610	res = GENOPER_OPFAIL;
611	goto retm;
612	}
613
614	// check if original is valid
615	res = ValidateRec( root, 20 );
616	// might have been repaired!
617	if (GENOPER_REPAIR==res) {
618	res = GENOPER_OK;
619	}
620	if (GENOPER_OK != res) {
621	goto retm;
622	}
623
624	// decide number of nodes to mutate
625	// decide maximum number of nodes to mutate: 0.25*nodes, min 2
626	totNodes = root->child->count();
627	maxToMut = (int)( 0.25f * totNodes);
628	if (maxToMut<2) maxToMut=2;
629	if (maxToMut>totNodes) maxToMut=totNodes;
630
631	// decide number of nodes to mutate
632	n = (int)( 0.5f + rndDouble(1) * maxToMut );
633	if (n<1) n=1;
634	if (n>totNodes) n=totNodes;
635	// set chg as this percent
636	chg = ((float)n) / ((float)totNodes);
637	for (i=0; i<n; i++)
638	{
639	res = MutateOneValid(root);
640	if (GENOPER_OK != res)
641	{
642	res = GENOPER_OPFAIL;
643	goto retm;
644	}
645	}
646	// OK, convert back to string
647	g[0]=0;
648	root->child->sprintAdj(g);
649	retm:
650	delete root;
651	return res;
652	}
653	*/
654
655
656	int Geno_f4::CrossOverOne(f4_node g1, f4_node g2, float chg) const
657	{
658	// ! the genotypes are g1->child and g2->child (not g1 g2) !
659	// single offspring in g1
660	int smin, smax;
661	float size;
662	f4_node n1, n2, n1p, n2p;
663
664	// determine desired size
665	size = (1 - chg) * (float)g1->count();
666	smin = (int)(size*0.9f - 1);
667	smax = (int)(size*1.1f + 1);
668	// get a random node with desired size
669	n1 = g1->child->randomNodeWithSize(smin, smax);
670
671	// determine desired size
672	size = (1 - chg) * (float)g2->count();
673	smin = (int)(size*0.9f - 1);
674	smax = (int)(size*1.1f + 1);
675	// get a random node with desired size
676	n2 = g2->child->randomNodeWithSize(smin, smax);
677
678	// exchange the two nodes:
679	n1p = n1->parent;
680	n2p = n2->parent;
681	n1p->removeChild(n1);
682	n1p->addChild(n2);
683	n2p->removeChild(n2);
684	n2p->addChild(n1);
685	n1->parent = n2p;
686	n2->parent = n1p;
687
688	return GENOPER_OK;
689	}
690
691	int Geno_f4::crossOver(char &g1, char &g2, float &chg1, float &chg2)
692	{
693	f4_node root1, root2, copy1, copy2;
694
695	// convert genotype strings into tree structures
696	if (f4_processrec(g1, 0, &root1) \|\| (root1.childCount() != 1)) return GENOPER_OPFAIL;
697	if (f4_processrec(g2, 0, &root2) \|\| (root2.childCount() != 1)) return GENOPER_OPFAIL;
698
699	// decide amounts of crossover, 0.25-0.75
700	// adam: seems 0.1-0.9 -- MacKo
701	chg1 = 0.1 + rndDouble(0.8);
702	chg2 = 0.1 + rndDouble(0.8);
703
704	copy1 = root1.duplicate();
705	if (CrossOverOne(copy1, &root2, chg1) != GENOPER_OK) { delete copy1; copy1 = NULL; }
706	copy2 = root2.duplicate();
707	if (CrossOverOne(copy2, &root1, chg2) != GENOPER_OK) { delete copy2; copy2 = NULL; }
708
709	g1[0] = 0;
710	g2[0] = 0;
711	if (copy1) { copy1->child->sprintAdj(g1); delete copy1; }
712	if (copy2) { copy2->child->sprintAdj(g2); delete copy2; }
713	if (g1[0] \|\| g2[0]) return GENOPER_OK; else return GENOPER_OPFAIL;
714	}
715
716	uint32_t Geno_f4::style(const char *g, int pos)
717	{
718	char ch = g[pos];
719
720	// style categories
721	#define STYL4CAT_MODIFIC F14_MODIFIERS ","
722	#define STYL4CAT_NEUMOD "[]:+-/!="
723	#define STYL4CAT_NEUSPECIAL "\|@*"
724	#define STYL4CAT_DIGIT "0123456789."
725	#define STYL4CAT_REST "XN<># "
726
727	if (!isalpha(ch) && !strchr(STYL4CAT_MODIFIC STYL4CAT_NEUMOD STYL4CAT_NEUSPECIAL STYL4CAT_DIGIT STYL4CAT_REST "\t", ch))
728	{
729	return GENSTYLE_CS(0, GENSTYLE_INVALID);
730	}
731	uint32_t style = GENSTYLE_CS(0, GENSTYLE_STRIKEOUT); //default, should be changed below
732	if (strchr("X ", ch)) style = GENSTYLE_CS(0, GENSTYLE_NONE);
733	else if (strchr("N", ch)) style = GENSTYLE_RGBS(0, 200, 0, GENSTYLE_NONE);
734	else if (strchr("<", ch)) style = GENSTYLE_RGBS(0, 0, 200, GENSTYLE_BOLD);
735	else if (strchr(">", ch)) style = GENSTYLE_RGBS(0, 0, 100, GENSTYLE_NONE);
736	else if (strchr(STYL4CAT_DIGIT, ch)) style = GENSTYLE_RGBS(100, 100, 100, GENSTYLE_NONE);
737	else if (strchr(STYL4CAT_MODIFIC, ch)) style = GENSTYLE_RGBS(100, 100, 100, GENSTYLE_NONE);
738	else if (strchr(STYL4CAT_NEUMOD, ch)) style = GENSTYLE_RGBS(0, 150, 0, GENSTYLE_NONE);
739	if (isalpha(ch) \|\| strchr(STYL4CAT_NEUSPECIAL, ch))
740	{
741	while (pos > 0)
742	{
743	pos--;
744	if (!(isalpha(g[pos]) \|\| strchr(STYL4CAT_NEUSPECIAL, ch)))
745	{
746	if (isupper(g[pos + 1]) && (g[pos] == ':' \|\| g[pos] == '[')) // name of neuron class
747	style = GENSTYLE_RGBS(150, 0, 150, GENSTYLE_ITALIC);
748	else // property
749	style = GENSTYLE_RGBS(100, 100, 100, GENSTYLE_NONE);
750	}
751	}
752	}
753	return style;
754	}

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