Function simplifyHasInclude

externals/simplecpp/simplecpp.cpp:2674–2728

Evaluate __has_include(include) * @throws std::runtime_error thrown on missing arguments or invalid expression */

 * @throws std::runtime_error thrown on missing arguments or invalid expression
 */
static void simplifyHasInclude(simplecpp::TokenList &expr, const simplecpp::DUI &dui)
{
    if (!isCpp17OrLater(dui) && !isGnu(dui))
        return;

    for (simplecpp::Token *tok = expr.front(); tok; tok = tok->next) {
        if (tok->str() != HAS_INCLUDE)
            continue;
        const simplecpp::Token *tok1 = tok->next;
        if (!tok1) {
            throw std::runtime_error("missing __has_include argument");
        }
        const simplecpp::Token *tok2 = tok1->next;
        if (!tok2) {
            throw std::runtime_error("missing __has_include argument");
        }
        if (tok1->op == '(') {
            tok1 = tok1->next;
            while (tok2->op != ')') {
                tok2 = tok2->next;
                if (!tok2) {
                    throw std::runtime_error("invalid __has_include expression");
                }
            }
        }

        const std::string &sourcefile = expr.file(tok->location);
        const bool systemheader = (tok1 && tok1->op == '<');
        std::string header;
        if (systemheader) {
            const simplecpp::Token *tok3 = tok1->next;
            if (!tok3) {
                throw std::runtime_error("missing __has_include closing angular bracket");
            }
            while (tok3->op != '>') {
                tok3 = tok3->next;
                if (!tok3) {
                    throw std::runtime_error("invalid __has_include expression");
                }
            }

            for (const simplecpp::Token *headerToken = tok1->next; headerToken != tok3; headerToken = headerToken->next)
                header += headerToken->str();
        } else {
            header = tok1->str().substr(1U, tok1->str().size() - 2U);
        }
        std::ifstream f;
        const std::string header2 = openHeader(f,dui,sourcefile,header,systemheader);
        tok->setstr(header2.empty() ? "0" : "1");

        tok2 = tok2->next;
        while (tok->next != tok2)
            expr.deleteToken(tok->next);
    }
}

/** Evaluate name
 * @throws std::runtime_error thrown on undefined function-like macro