in src/main/java/org/apache/commons/jexl3/internal/introspection/PermissionsParser.java [125:219]
private int readClass(final Permissions.NoJexlPackage njpackage, final boolean nojexl, final String outer, final String inner, final int offset) {
final StringBuilder temp = new StringBuilder();
Permissions.NoJexlClass njclass = null;
String njname = null;
String identifier = inner;
boolean deny = nojexl;
int i = offset;
int j = -1;
boolean isMethod = false;
while(i < size) {
final char c = src.charAt(i);
// if no parsing progress can be made, we are in error
if (j >= i) {
throw new IllegalStateException(unexpected(c, i));
}
j = i;
// get rid of space
if (Character.isWhitespace(c)) {
i = readSpaces(i + 1);
continue;
}
// eol comment
if (c == '#') {
i = readEol(i + 1);
continue;
}
// end of class ?
if (njclass != null && c == '}') {
i += 1;
break;
}
// read an identifier, the class name
if (identifier == null) {
// negative or positive set ?
if (c == '-') {
i += 1;
} else if (c == '+') {
deny = false;
i += 1;
}
final int next = readIdentifier(temp, i);
if (i != next) {
identifier = temp.toString();
temp.setLength(0);
i = next;
continue;
}
}
// parse a class:
if (njclass == null) {
// we must have read the class ('identifier {'...)
if (identifier == null || c != '{') {
throw new IllegalStateException(unexpected(c, i));
}
// if we have a class, it has a name
njclass = deny ? new Permissions.NoJexlClass() : new Permissions.JexlClass();
njname = outer != null ? outer + "$" + identifier : identifier;
njpackage.addNoJexl(njname, njclass);
identifier = null;
} else if (identifier != null) {
// class member mode
if (c == '{') {
// inner class
i = readClass(njpackage, deny, njname, identifier, i - 1);
identifier = null;
continue;
}
if (c == ';') {
// field or method?
if (isMethod) {
njclass.methodNames.add(identifier);
isMethod = false;
} else {
njclass.fieldNames.add(identifier);
}
identifier = null;
} else if (c == '(' && !isMethod) {
// method; only one opening parenthesis allowed
isMethod = true;
} else if (c != ')' || src.charAt(i - 1) != '(') {
// closing parenthesis following opening one was expected
throw new IllegalStateException(unexpected(c, i));
}
}
i += 1;
}
// empty class means allow or deny all
if (njname != null && njclass.isEmpty()) {
njpackage.addNoJexl(njname, njclass instanceof Permissions.JexlClass
? Permissions.JEXL_CLASS
: Permissions.NOJEXL_CLASS);
}
return i;
}