Function astIsVariableComparison

lib/astutils.cpp:367–412

}

const Token * astIsVariableComparison(const Token *tok, const std::string &comp, const std::string &rhs, const Token **vartok)
{
    if (!tok)
        return nullptr;

    const Token *ret = nullptr;
    if (tok->isComparisonOp()) {
        if (tok->astOperand1() && match(tok->astOperand1(), rhs)) {
            // Invert comparator
            std::string s = tok->str();
            if (s[0] == '>')
                s[0] = '<';
            else if (s[0] == '<')
                s[0] = '>';
            if (s == comp) {
                ret = tok->astOperand2();
            }
        } else if (tok->str() == comp && tok->astOperand2() && match(tok->astOperand2(), rhs)) {
            ret = tok->astOperand1();
        }
    } else if (comp == "!=" && rhs == "0") {
        if (tok->str() == "!") {
            ret = tok->astOperand1();
            // handle (!(x==0)) as (x!=0)
            astIsVariableComparison(ret, "==", "0", &ret);
        } else
            ret = tok;
    } else if (comp == "==" && rhs == "0") {
        if (tok->str() == "!") {
            ret = tok->astOperand1();
            // handle (!(x!=0)) as (x==0)
            astIsVariableComparison(ret, "!=", "0", &ret);
        }
    }
    while (ret && ret->str() == ".")
        ret = ret->astOperand2();
    while (ret && ret->isCast())
        ret = ret->astOperand2() ? ret->astOperand2() : ret->astOperand1();
    if (ret && ret->str() == "=" && ret->astOperand1() && ret->astOperand1()->varId())
        ret = ret->astOperand1();
    else if (ret && ret->varId() == 0U)
        ret = nullptr;
    if (vartok)
        *vartok = ret;
    return ret;
}

bool isVariableDecl(const Token* tok)
{