switch (expression[index++]) {
case '&': {
expr = processTerm(subtermStart, index - 1, expr, expression);
if (result != null) {
if (!result.type.equals(NodeType.AND))
throw new BadArgumentException("cannot mix & and |", new String(expression, Constants.UTF8), index - 1);
} else {
result = new Node(NodeType.AND, wholeTermStart);
}
result.add(expr);
expr = null;
subtermStart = index;
subtermComplete = false;
break;
}
case '|': {
expr = processTerm(subtermStart, index - 1, expr, expression);
if (result != null) {
if (!result.type.equals(NodeType.OR))
throw new BadArgumentException("cannot mix | and &", new String(expression, Constants.UTF8), index - 1);
} else {
result = new Node(NodeType.OR, wholeTermStart);
}
result.add(expr);
expr = null;
subtermStart = index;
subtermComplete = false;
break;
}
case '(': {
parens++;
if (subtermStart != index - 1 || expr != null)
throw new BadArgumentException("expression needs & or |", new String(expression, Constants.UTF8), index - 1);
expr = parse_(expression);
subtermStart = index;
subtermComplete = false;
break;
}
case ')': {
parens--;
Node child = processTerm(subtermStart, index - 1, expr, expression);
if (child == null && result == null)
throw new BadArgumentException("empty expression not allowed", new String(expression, Constants.UTF8), index);
if (result == null)
return child;
if (result.type == child.type)
for (Node c : child.children)
result.add(c);
else
result.add(child);
result.end = index - 1;
return result;
}
case '"': {
if (subtermStart != index - 1)
throw new BadArgumentException("expression needs & or |", new String(expression, Constants.UTF8), index - 1);
while (index < expression.length && expression[index] != '"') {
if (expression[index] == '\\') {
index++;
if (expression[index] != '\\' && expression[index] != '"')
throw new BadArgumentException("invalid escaping within quotes", new String(expression, Constants.UTF8), index - 1);
}
index++;
}
if (index == expression.length)
throw new BadArgumentException("unclosed quote", new String(expression, Constants.UTF8), subtermStart);
if (subtermStart + 1 == index)
throw new BadArgumentException("empty term", new String(expression, Constants.UTF8), subtermStart);
index++;
subtermComplete = true;
break;
}
default: {
if (subtermComplete)
throw new BadArgumentException("expression needs & or |", new String(expression, Constants.UTF8), index - 1);
byte c = expression[index - 1];
if (!Authorizations.isValidAuthChar(c))
throw new BadArgumentException("bad character (" + c + ")", new String(expression, Constants.UTF8), index - 1);
}
}
}
Node child = processTerm(subtermStart, index, expr, expression);
if (result != null) {
result.add(child);
result.end = index;
} else
result = child;
if (result.type != NodeType.TERM)
if (result.children.size() < 2)
throw new BadArgumentException("missing term", new String(expression, Constants.UTF8), index);
return result;
}