/**

* @name Use of octal values

* @description An integer literal that starts with '0' may cause a problem. If the '0' is

* intentional, a programmer may misread the literal as a decimal literal. If the '0'

* is unintentional and a decimal literal is intended, the compiler treats the

* literal as an octal literal.

* @kind problem

* @problem.severity warning

* @precision low

* @id java/octal-literal

* @tags maintainability

* correctness

*/

import java

from IntegerLiteral lit, string val

where

lit.getLiteral() = val and

val.regexpMatch("0[0-7][0-7]+") and

lit.getParent() instanceof BinaryExpr and

not lit.getParent() instanceof Assignment and

not lit.getParent() instanceof BitwiseExpr and

not lit.getParent() instanceof ComparisonExpr

select lit, "Integer literal starts with 0."