private int readClass()

in src/main/java/org/apache/commons/jexl3/internal/introspection/PermissionsParser.java [278:361]
70 lines of code
22 McCabe index (conditional complexity)

    private int readClass(final Permissions.NoJexlPackage njpackage, final String outer, final String inner, final int offset) {
        final StringBuilder temp = new StringBuilder();
        Permissions.NoJexlClass njclass = null;
        String njname = null;
        String identifier = inner;
        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 == '}') {
                // restrict the whole class
                if (njclass.isEmpty()) {
                    njpackage.addNoJexl(njname, Permissions.NOJEXL_CLASS);
                }
                i += 1;
                break;
            }
            // read an identifier, the class name
            if (identifier == null) {
                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 = new Permissions.NoJexlClass();
                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, 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;
        }
        return i;
    }