private void findAndInstantiateBaseProps(Gdl gdl) {
if (gdl instanceof GdlRelation) {
GdlRelation relation = (GdlRelation) gdl;
String name = relation.getName().toString();
if (name.equals("init")) {
if (relation.arity() != 1)
throw new RuntimeException("Can't init more than one thing as far as I know.");
GdlTerm template = relation.get(0);
if (template instanceof GdlConstant) {
List<GdlTerm> body = new ArrayList<GdlTerm>();
body.add(template);
GdlRelation toAdd = GdlPool.getRelation(baseConstant, body);
baseRelations.add(toAdd);
System.err.println("Weird init of constant");
} else if (template instanceof GdlVariable) {
System.err.println("Weird init of constant");
List<GdlTerm> body = new ArrayList<GdlTerm>();
body.add(universalDom);
GdlRelation toAdd = GdlPool.getRelation(baseConstant, body);
baseRelations.add(toAdd);
System.err.println("Weird init of variable");
} else if (template instanceof GdlFunction) {
GdlFunction func = (GdlFunction) template;
instantiateBaseProps(func.toSentence());
}
}
} else if (gdl instanceof GdlRule) {
GdlRule rule = (GdlRule) gdl;
String name = rule.getHead().getName().toString();
if (name.equals("next")) {
GdlSentence head = rule.getHead();
if (head.arity() != 1)
throw new RuntimeException("Can't next more than one thing as far as I know.");
if (head.get(0) instanceof GdlVariable) { // weird case where you have rule like (next ?q)
Location l = new Location();
l.idx = 0;
l.name = head.getName();
Domain dom = domains.get(l);
for (GdlConstant c : dom.values) {
List<GdlTerm> body = new ArrayList<GdlTerm>();
body.add(c);
baseRelations.add(GdlPool.getRelation(baseConstant, body));
}
} else instantiateBasePropsWithRHS(head.get(0).toSentence(), rule.getBody());
}
}
}
private static GdlRule substituteRule(GdlRule rule, Substitution theta) {
GdlSentence head = substitute(rule.getHead(), theta);
List<GdlLiteral> body = new ArrayList<>();
for (GdlLiteral literal : rule.getBody()) {
body.add(substituteLiteral(literal, theta));
}
return GdlPool.getRule(head, body);
}
void initializeDomains(Gdl gdl) {
if (gdl instanceof GdlRelation) {
GdlRelation relation = (GdlRelation) gdl;
String name = relation.getName().toString();
if (!name.equals("base")) {
GdlTerm term = relation.toTerm();
GdlTerm generified = findGenericForm(term);
Assignment instantiation = getConstantList(term);
if (!domains.containsKey(generified)) domains.put(generified, new Domain(generified, term));
Domain dom = domains.get(generified);
dom.assignments.add(instantiation);
}
} else if (gdl instanceof GdlRule) {
GdlRule rule = (GdlRule) gdl;
GdlSentence head = rule.getHead();
if (head instanceof GdlRelation) {
GdlRelation rel = (GdlRelation) head;
GdlTerm term = rel.toTerm();
GdlTerm generified = findGenericForm(term);
if (!domains.containsKey(generified)) domains.put(generified, new Domain(generified, term));
Domain dom = domains.get(generified);
List<GdlTerm> productionTemplate = getConstantAndVariableList(term);
List<List<GdlLiteral>> newRHSs = deOr(rule.getBody());
for (List<GdlLiteral> RHS : newRHSs) {
RuleReference ruleRef = new RuleReference(GdlPool.getRule(head, RHS));
ruleRef.productionTemplate = productionTemplate;
for (GdlLiteral lit : RHS) {
if (lit instanceof GdlSentence) {
GdlTerm t = ((GdlSentence) lit).toTerm();
Condition cond = new Condition(t);
ruleRef.conditions.add(cond);
}
}
dom.ruleRefs.add(ruleRef);
}
} else {
List<List<GdlLiteral>> newRHSs = deOr(rule.getBody());
for (List<GdlLiteral> RHS : newRHSs) {
RuleReference ruleRef = new RuleReference(GdlPool.getRule(head, RHS));
for (GdlLiteral lit : RHS) {
if (lit instanceof GdlSentence) {
GdlTerm t = ((GdlSentence) lit).toTerm();
Condition cond = new Condition(t);
ruleRef.conditions.add(cond);
}
}
extraRefs.add(ruleRef);
}
}
}
}
private Gdl getInstantiationAux(Gdl gdl, Map<GdlVariable, GdlConstant> varInstantiation) {
if (gdl instanceof GdlRelation) {
GdlRelation relation = (GdlRelation) gdl;
List<GdlTerm> body = new ArrayList<>();
for (int i = 0; i < relation.arity(); i++) {
body.add((GdlTerm) getInstantiationAux(relation.get(i), varInstantiation));
}
return GdlPool.getRelation(relation.getName(), body);
} else if (gdl instanceof GdlRule) {
GdlRule rule = (GdlRule) gdl;
GdlSentence head = (GdlSentence) getInstantiationAux(rule.getHead(), varInstantiation);
List<GdlLiteral> body = new ArrayList<>();
for (int i = 0; i < rule.arity(); i++) {
body.add((GdlLiteral) getInstantiationAux(rule.get(i), varInstantiation));
}
return GdlPool.getRule(head, body);
} else if (gdl instanceof GdlDistinct) {
GdlDistinct distinct = (GdlDistinct) gdl;
GdlTerm arg1 = (GdlTerm) getInstantiationAux(distinct.getArg1(), varInstantiation);
GdlTerm arg2 = (GdlTerm) getInstantiationAux(distinct.getArg2(), varInstantiation);
return GdlPool.getDistinct(arg1, arg2);
} else if (gdl instanceof GdlNot) {
GdlNot not = (GdlNot) gdl;
GdlLiteral body = (GdlLiteral) getInstantiationAux(not.getBody(), varInstantiation);
return GdlPool.getNot(body);
} else if (gdl instanceof GdlOr) {
GdlOr or = (GdlOr) gdl;
List<GdlLiteral> body = new ArrayList<>();
for (int i = 0; i < or.arity(); i++) {
body.add((GdlLiteral) getInstantiationAux(or.get(i), varInstantiation));
}
return GdlPool.getOr(body);
} else if (gdl instanceof GdlProposition) {
return gdl;
} else if (gdl instanceof GdlConstant) {
return gdl;
} else if (gdl instanceof GdlFunction) {
GdlFunction func = (GdlFunction) gdl;
List<GdlTerm> body = new ArrayList<>();
for (int i = 0; i < func.arity(); i++) {
body.add((GdlTerm) getInstantiationAux(func.get(i), varInstantiation));
}
return GdlPool.getFunction(func.getName(), body);
} else if (gdl instanceof GdlVariable) {
GdlVariable variable = (GdlVariable) gdl;
return varInstantiation.get(variable);
} else
throw new RuntimeException(
"Someone went and extended the GDL hierarchy without updating this code.");
}
void processDomain(Gdl gdl) {
if (gdl instanceof GdlRelation) {
GdlRelation relation = (GdlRelation) gdl;
String name = relation.getName().toString();
if (!name.equals("base")) {
addDomain(relation);
}
} else if (gdl instanceof GdlRule) {
GdlRule rule = (GdlRule) gdl;
GdlSentence head = rule.getHead();
if (head instanceof GdlRelation) {
GdlRelation rel = (GdlRelation) head;
int i = 0;
for (GdlTerm term : rel.getBody()) {
addDomain2(term, rel.getName(), i, rule.getBody());
i++;
}
} else if (head instanceof GdlProposition) {
// GdlProposition prop = (GdlProposition)head;
// addDomain2(prop.toTerm(), prop.getName(), 0, rule.getBody());
} else throw new RuntimeException("Don't know how to deal with this.");
}
}
// Returns null if the rule is useless.
private static GdlRule removeNotDistinctLiteral(GdlRule rule, GdlNot notDistinctLiteral) {
// Figure out the substitution we want...
// If we have two constants: Either remove one or
// maybe get rid of the ___?
// One is a variable: Replace the variable with the other thing
// throughout the rule
GdlDistinct distinct = (GdlDistinct) notDistinctLiteral.getBody();
GdlTerm arg1 = distinct.getArg1();
GdlTerm arg2 = distinct.getArg2();
if (arg1 == arg2) {
// Just remove that literal
List<GdlLiteral> newBody = new ArrayList<GdlLiteral>();
newBody.addAll(rule.getBody());
newBody.remove(notDistinctLiteral);
return GdlPool.getRule(rule.getHead(), newBody);
}
if (arg1 instanceof GdlVariable) {
// What we return will still have the not-distinct literal,
// but it will get replaced in the next pass.
// (Even if we have two variables, they will be equal next time through.)
return CommonTransforms.replaceVariable(rule, (GdlVariable) arg1, arg2);
}
if (arg2 instanceof GdlVariable) {
return CommonTransforms.replaceVariable(rule, (GdlVariable) arg2, arg1);
}
if (arg1 instanceof GdlConstant || arg2 instanceof GdlConstant) {
// We have two non-equal constants, or a constant and a function.
// The rule should have no effect.
return null;
}
// We have two functions. Complicated! (Have to replace them with unified version.)
// We pass on this case for now.
// TODO: Implement correctly.
throw new UnsupportedOperationException(
"We can't currently handle (not (distinct <function> <function>)).");
}
private static List<Gdl> runOnce(List<Gdl> description) {
List<Gdl> newDescription = new ArrayList<Gdl>();
// First: Clean up all rules with zero-element bodies
for (Gdl gdl : description) {
if (gdl instanceof GdlRule) {
GdlRule rule = (GdlRule) gdl;
if (rule.getBody().size() == 0) {
newDescription.add(rule.getHead());
} else {
newDescription.add(gdl);
}
} else {
newDescription.add(gdl);
}
}
// TODO: Add (role ?player) where appropriate, i.e. in rules for
// "legal" or "input" where the first argument is an undefined
// variable
// Get rid of "extra parentheses", i.e. zero-arity functions
description = newDescription;
newDescription = new ArrayList<Gdl>();
for (Gdl gdl : description) {
if (gdl instanceof GdlRelation) {
newDescription.add(cleanParentheses((GdlRelation) gdl));
} else if (gdl instanceof GdlRule) {
newDescription.add(cleanParentheses((GdlRule) gdl));
} else {
newDescription.add(gdl);
}
}
// TODO: Get rid of GdlPropositions in the description
// Get rid of (not (distinct _ _)) literals in rules
// TODO: Expand to functions
description = newDescription;
newDescription = new ArrayList<Gdl>();
for (Gdl gdl : description) {
if (gdl instanceof GdlRule) {
GdlRule cleaned = removeNotDistinctLiterals((GdlRule) gdl);
if (cleaned != null) newDescription.add(cleaned);
} else {
newDescription.add(gdl);
}
}
// Get rid of the old style of "base" sentences (with arity more than 1, not in rules)
// See e.g. current version of Qyshinsu on the Dresden server
description = newDescription;
newDescription = new ArrayList<Gdl>();
boolean removeBaseSentences = false;
for (Gdl gdl : description) {
if (gdl instanceof GdlRelation) {
GdlRelation relation = (GdlRelation) gdl;
if (relation.getName() == BASE && relation.arity() != 1) {
removeBaseSentences = true;
break;
}
}
}
// Note that in this case, we have to remove ALL of them or we might
// misinterpret this as being the new kind of "base" relation
for (Gdl gdl : description) {
if (gdl instanceof GdlRelation) {
GdlRelation relation = (GdlRelation) gdl;
if (removeBaseSentences && relation.getName() == BASE) {
// Leave out the relation
} else {
newDescription.add(gdl);
}
} else {
newDescription.add(gdl);
}
}
return newDescription;
}
private static GdlRule cleanParentheses(GdlRule rule) {
GdlSentence cleanedHead = cleanParentheses(rule.getHead());
List<GdlLiteral> cleanedBody = new ArrayList<GdlLiteral>();
for (GdlLiteral literal : rule.getBody()) cleanedBody.add(cleanParentheses(literal));
return GdlPool.getRule(cleanedHead, cleanedBody);
}