function compile(src) {
    var cached;

    if (typeof src !== "string") {
        throw new TypeError("src must be a string, instead saw '" + typeof src + "'");
    }

    if (!compile.cache) {
        return parser.parse(src);
    }

    cached = compile.cache[src];
    if (!cached) {
        cached = compile.cache[src] = parser.parse(src);
    }

    return cached;
}
The software constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.