public String evaluate(PropertySource ps, boolean localized) throws ExpressionException {
if (getExpression().length() == 0) {
return "";
}
// Default to the GameModule to satisfy properties if no
// GamePiece supplied.
source = ps == null ? GameModule.getGameModule() : ps;
setNameSpace(expressionNameSpace);
// Bind each undeclared variable with the value of the
// corresponding Vassal property. Allow for old-style $variable$ references
for (String var : variables) {
String name = var;
if (name.length() > 2 && name.startsWith("$") && name.endsWith("$")) {
name = name.substring(1, name.length() - 1);
}
Object prop = localized ? source.getLocalizedProperty(name) : source.getProperty(name);
String value = prop == null ? "" : prop.toString();
if (value == null) {
setVar(var, "");
} else if ("true".equals(value)) {
setVar(var, true);
} else if ("false".equals(value)) {
setVar(var, false);
} else {
try {
setVar(var, Integer.valueOf(value).intValue());
} catch (NumberFormatException e) {
try {
setVar(var, Float.valueOf(value).floatValue());
} catch (NumberFormatException e1) {
setVar(var, value);
}
}
}
}
// Re-evaluate the pre-parsed expression now that the undefined variables have
// been bound to their Vassal property values.
setVar(THIS, this);
setVar(SOURCE, source);
String result = "";
try {
eval(MAGIC1 + "=" + MAGIC2 + "()");
result = get(MAGIC1).toString();
} catch (EvalError e) {
final String s = e.getRawMessage();
final String search = MAGIC2 + "();'' : ";
final int pos = s.indexOf(search);
throw new ExpressionException(getExpression(), s.substring(pos + search.length()));
}
return result;
}
public Object getLocalizedProperty(String name) {
final Object value = source.getLocalizedProperty(name);
return value == null ? "" : value.toString();
}