public ITree filterAmbiguity(ITree ambCluster, Object environment) {
ISet alts = (ISet) ambCluster.get("alternatives");
if (alts.size() == 0) {
return null;
}
Environment env = (Environment) environment;
Result<IValue> var = env.getFrameVariable("amb");
if (var != null && var instanceof ICallableValue) {
Type type = RascalTypeFactory.getInstance().nonTerminalType(ambCluster);
ICallableValue func = (ICallableValue) var;
try {
Result<IValue> result = func.call(new Type[] {TF.setType(type)}, new IValue[] {alts}, null);
if (result.getType().isBottom()) {
return ambCluster;
}
ITree r = (ITree) result.getValue();
if (TreeAdapter.isAmb(r)) {
ISet returnedAlts = TreeAdapter.getAlternatives(r);
if (returnedAlts.size() == 1) {
return (ITree) returnedAlts.iterator().next();
} else if (returnedAlts.size() == 0) {
return null;
} else {
return r;
}
}
return (ITree) result.getValue();
} catch (ArgumentMismatch e) {
return ambCluster;
}
}
return ambCluster;
}
public ISourceLocation resolveSourceLocation(ISourceLocation loc) {
String scheme = loc.getScheme();
int pos;
ICallableValue resolver = sourceResolvers.get(scheme);
if (resolver == null) {
for (char sep : new char[] {'+', ':'}) {
pos = scheme.indexOf(sep);
if (pos != -1) {
scheme = scheme.substring(0, pos);
}
}
resolver = sourceResolvers.get(scheme);
if (resolver == null) {
return loc;
}
}
Type[] argTypes = new Type[] {TypeFactory.getInstance().sourceLocationType()};
IValue[] argValues = new IValue[] {loc};
return (ISourceLocation) resolver.call(argTypes, argValues, null).getValue();
}
private static Result<IValue> call(ICallableValue function, IList args) {
try {
int nrOfArgs = args.length();
Type[] types = new Type[nrOfArgs];
IValue[] actuals = new IValue[nrOfArgs];
for (int i = nrOfArgs - 1; i >= 0; --i) {
IValue arg = args.get(i);
types[i] = RascalTypeFactory.getInstance().nonTerminalType((IConstructor) arg);
actuals[i] = arg;
}
return function.call(types, actuals, null);
} catch (MatchFailed e) {
return null;
} catch (Failure f) {
return null;
}
}