Function handle_directive

examples/js/repl.js:1091–1182

(cmd, expr)

    /* return true if the string after cmd can be evaluated as JS */
    function handle_directive(cmd, expr) {
        var param, prec1, expBits1;

        if (cmd === "h" || cmd === "?" || cmd == "help") {
            help();
        } else if (cmd === "load") {
            var filename = expr.substring(cmd.length + 1).trim();
            if (filename.lastIndexOf(".") <= filename.lastIndexOf("/"))
                filename += ".js";
            std.loadScript(filename);
            return false;
        } else if (cmd === "x") {
            hex_mode = true;
        } else if (cmd === "d") {
            hex_mode = false;
        } else if (cmd === "t") {
            show_time = !show_time;
        } else if (has_bignum && cmd === "p") {
            param = expr.substring(cmd.length + 1).trim().split(" ");
            if (param.length === 1 && param[0] === "") {
                std.puts("BigFloat precision=" + prec + " bits (~" +
                          Math.floor(prec / log2_10) +
                          " digits), exponent size=" + expBits + " bits\n");
            } else if (param[0] === "f16") {
                prec = 11;
                expBits = 5;
            } else if (param[0] === "f32") {
                prec = 24;
                expBits = 8;
            } else if (param[0] === "f64") {
                prec = 53;
                expBits = 11;
            } else if (param[0] === "f128") {
                prec = 113;
                expBits = 15;
            } else {
                prec1 = parseInt(param[0]);
                if (param.length >= 2)
                    expBits1 = parseInt(param[1]);
                else
                    expBits1 = BigFloatEnv.expBitsMax;
                if (Number.isNaN(prec1) ||
                    prec1 < BigFloatEnv.precMin ||
                    prec1 > BigFloatEnv.precMax) {
                    std.puts("Invalid precision\n");
                    return false;
                }
                if (Number.isNaN(expBits1) ||
                    expBits1 < BigFloatEnv.expBitsMin ||
                    expBits1 > BigFloatEnv.expBitsMax) {
                    std.puts("Invalid exponent bits\n");
                    return false;
                }
                prec = prec1;
                expBits = expBits1;
            }
            return false;
        } else if (has_bignum && cmd === "digits") {