function.js•1.4 kB
'use strict';
const { getBooleanOption, cppdb } = require('../util');
module.exports = function defineFunction(name, options, fn) {
// Apply defaults
if (options == null) options = {};
if (typeof options === 'function') { fn = options; options = {}; }
// Validate arguments
if (typeof name !== 'string') throw new TypeError('Expected first argument to be a string');
if (typeof fn !== 'function') throw new TypeError('Expected last argument to be a function');
if (typeof options !== 'object') throw new TypeError('Expected second argument to be an options object');
if (!name) throw new TypeError('User-defined function name cannot be an empty string');
// Interpret options
const safeIntegers = 'safeIntegers' in options ? +getBooleanOption(options, 'safeIntegers') : 2;
const deterministic = getBooleanOption(options, 'deterministic');
const directOnly = getBooleanOption(options, 'directOnly');
const varargs = getBooleanOption(options, 'varargs');
let argCount = -1;
// Determine argument count
if (!varargs) {
argCount = fn.length;
if (!Number.isInteger(argCount) || argCount < 0) throw new TypeError('Expected function.length to be a positive integer');
if (argCount > 100) throw new RangeError('User-defined functions cannot have more than 100 arguments');
}
this[cppdb].function(fn, name, argCount, safeIntegers, deterministic, directOnly);
return this;
};