lootastic
Version:
a loot rolling system
719 lines (669 loc) • 20.5 kB
JavaScript
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/* 0 */
/***/ (function(module, exports, __webpack_require__) {
;
function __export(m) {
for (var p in m) if (!exports.hasOwnProperty(p)) exports[p] = m[p];
}
Object.defineProperty(exports, "__esModule", { value: true });
__export(__webpack_require__(1));
/***/ }),
/* 1 */
/***/ (function(module, exports, __webpack_require__) {
;
Object.defineProperty(exports, "__esModule", { value: true });
const weighted_randomly_select_1 = __webpack_require__(2);
const random = __webpack_require__(3);
var LootFunction;
(function (LootFunction) {
LootFunction["WithReplacement"] = "chooseWithReplacement";
LootFunction["WithoutReplacement"] = "chooseWithoutReplacement";
LootFunction["EachItem"] = "tryToDropEachItem";
})(LootFunction = exports.LootFunction || (exports.LootFunction = {}));
class LootRoller {
static rollTables(lootTableConfigs) {
const items = [];
lootTableConfigs.forEach(({ table, func, args }) => {
items.push(...table[func](args));
});
return items;
}
static rollTable(lootTableConfig) {
return this.rollTables([lootTableConfig]);
}
}
exports.LootRoller = LootRoller;
;
class LootTable {
constructor(choices, { rollModifier } = { rollModifier: 0 }) {
this.choices = this.configureChoices(choices);
this.rollModifier = rollModifier || 0;
}
getFormattedChoices() {
const alwaysDrop = [];
const choices = this.choices.map(x => {
// if the chance < -1, it always drops
if (x.chance <= 0) {
alwaysDrop.push(x.result);
return null;
}
// if there is for some reason a negative total roll, this item can never drop
const totalChance = x.chance + this.rollModifier;
if (totalChance <= 0) {
return null;
}
return { result: x.result, chance: totalChance, maxChance: x.maxChance };
}).filter(Boolean);
return { alwaysDrop, choices };
}
configureChoices(choices) {
// pre-formatted with weights
if (choices[0].chance)
return choices;
// assign a weight of 1 to everything
return choices.map(item => ({ result: item, chance: 1 }));
}
chooseWithReplacement(numItems = 1) {
const { choices, alwaysDrop } = this.getFormattedChoices();
return alwaysDrop.concat(Array(numItems).fill(null).map(() => weighted_randomly_select_1.select(choices)));
}
chooseWithoutReplacement(numItems = 1) {
const { choices, alwaysDrop } = this.getFormattedChoices();
if (numItems > choices.length)
throw new Error(`Cannot choose ${numItems} without replacement when array is only ${choices.length} choices.`);
return alwaysDrop.concat(Array(numItems).fill(null).map(() => {
// choose something
const choice = weighted_randomly_select_1.select(choices);
// remove old choice
choices.splice(choices.indexOf(choice), 1);
return choice;
}));
}
tryToDropEachItem(comparisonValue) {
const { choices, alwaysDrop } = this.getFormattedChoices();
return alwaysDrop.concat(choices.map(({ result, chance, maxChance }) => {
const randomValue = random(0, maxChance || comparisonValue || 1);
if (chance >= randomValue)
return result;
return null;
}).filter(Boolean));
}
}
exports.LootTable = LootTable;
;
/***/ }),
/* 2 */
/***/ (function(module, exports, __webpack_require__) {
;
// Performs validation on input before performing the random selection
function selectWithValidation(choices) {
// Validate argument is an array
if(!choices || !choices.length) {
throw new Error("Randomly Select: invalid argument, please provide a non-empty array");
}
// Validate that:
// - each array entry has a 'chance' and 'result' property
// - each 'chance' field is a number
// - at least one result has a positive non-zero chance
let atLeastOneChoiceHasNonZeroChance = false;
for(let i = 0; i < choices.length; i++) {
if(!exists(choices[i]) || !exists(choices[i].chance) || !exists(choices[i].result)) {
throw new Error("Randomly Select: invalid argument, each array entry " +
"must be an object with 'chance' and 'result' properties");
} else if(typeof choices[i].chance !== 'number' || choices[i].chance < 0) {
throw new Error("Randomly Select: invalid argument, 'chance' must be a positive number: " +
JSON.stringify(choices[i].chance));
} else if(choices[i].chance > 0) {
atLeastOneChoiceHasNonZeroChance = true;
}
}
if(!atLeastOneChoiceHasNonZeroChance) {
throw new Error("Randomly Select: invalid arguments, all results have zero weight");
}
// Do the actual random selection and return the result
return selectWithoutValidation(choices);
}
// Performs the random selection without validating any input
function selectWithoutValidation(choices) {
// Generate a list of options with positive non-zero chances
let choicesWithNonZeroChances = [];
let totalWeight = 0.0;
for(let i = 0; i < choices.length; i++) {
if(choices[i].chance > 0.0) {
choicesWithNonZeroChances.push(choices[i]);
totalWeight += choices[i].chance;
}
}
// Pick a random value from [0,1)
let value = Math.random() * totalWeight;
// Iterate over possibilities until we find the selected one
let chanceCovered = 0.0;
for(let i = 0; i < choicesWithNonZeroChances.length; i++) {
chanceCovered += choicesWithNonZeroChances[i].chance;
if(value < chanceCovered) {
return choicesWithNonZeroChances[i].result;
}
}
}
function exists(value) {
return (value != null && value != undefined);
}
module.exports = {
// Performs validation on input before performing the random selection
select: selectWithValidation,
// Performs the random selection without validating any input
selectWithoutValidation: selectWithoutValidation
};
/***/ }),
/* 3 */
/***/ (function(module, exports) {
/**
* lodash (Custom Build) <https://lodash.com/>
* Build: `lodash modularize exports="npm" -o ./`
* Copyright jQuery Foundation and other contributors <https://jquery.org/>
* Released under MIT license <https://lodash.com/license>
* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
* Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
*/
/** Used as references for various `Number` constants. */
var INFINITY = 1 / 0,
MAX_SAFE_INTEGER = 9007199254740991,
MAX_INTEGER = 1.7976931348623157e+308,
NAN = 0 / 0;
/** `Object#toString` result references. */
var funcTag = '[object Function]',
genTag = '[object GeneratorFunction]',
symbolTag = '[object Symbol]';
/** Used to match leading and trailing whitespace. */
var reTrim = /^\s+|\s+$/g;
/** Used to detect bad signed hexadecimal string values. */
var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
/** Used to detect binary string values. */
var reIsBinary = /^0b[01]+$/i;
/** Used to detect octal string values. */
var reIsOctal = /^0o[0-7]+$/i;
/** Used to detect unsigned integer values. */
var reIsUint = /^(?:0|[1-9]\d*)$/;
/** Built-in method references without a dependency on `root`. */
var freeParseFloat = parseFloat,
freeParseInt = parseInt;
/** Used for built-in method references. */
var objectProto = Object.prototype;
/**
* Used to resolve the
* [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
* of values.
*/
var objectToString = objectProto.toString;
/* Built-in method references for those with the same name as other `lodash` methods. */
var nativeFloor = Math.floor,
nativeMin = Math.min,
nativeRandom = Math.random;
/**
* The base implementation of `_.random` without support for returning
* floating-point numbers.
*
* @private
* @param {number} lower The lower bound.
* @param {number} upper The upper bound.
* @returns {number} Returns the random number.
*/
function baseRandom(lower, upper) {
return lower + nativeFloor(nativeRandom() * (upper - lower + 1));
}
/**
* Checks if `value` is a valid array-like index.
*
* @private
* @param {*} value The value to check.
* @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
* @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
*/
function isIndex(value, length) {
length = length == null ? MAX_SAFE_INTEGER : length;
return !!length &&
(typeof value == 'number' || reIsUint.test(value)) &&
(value > -1 && value % 1 == 0 && value < length);
}
/**
* Checks if the given arguments are from an iteratee call.
*
* @private
* @param {*} value The potential iteratee value argument.
* @param {*} index The potential iteratee index or key argument.
* @param {*} object The potential iteratee object argument.
* @returns {boolean} Returns `true` if the arguments are from an iteratee call,
* else `false`.
*/
function isIterateeCall(value, index, object) {
if (!isObject(object)) {
return false;
}
var type = typeof index;
if (type == 'number'
? (isArrayLike(object) && isIndex(index, object.length))
: (type == 'string' && index in object)
) {
return eq(object[index], value);
}
return false;
}
/**
* Performs a
* [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
* comparison between two values to determine if they are equivalent.
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to compare.
* @param {*} other The other value to compare.
* @returns {boolean} Returns `true` if the values are equivalent, else `false`.
* @example
*
* var object = { 'a': 1 };
* var other = { 'a': 1 };
*
* _.eq(object, object);
* // => true
*
* _.eq(object, other);
* // => false
*
* _.eq('a', 'a');
* // => true
*
* _.eq('a', Object('a'));
* // => false
*
* _.eq(NaN, NaN);
* // => true
*/
function eq(value, other) {
return value === other || (value !== value && other !== other);
}
/**
* Checks if `value` is array-like. A value is considered array-like if it's
* not a function and has a `value.length` that's an integer greater than or
* equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is array-like, else `false`.
* @example
*
* _.isArrayLike([1, 2, 3]);
* // => true
*
* _.isArrayLike(document.body.children);
* // => true
*
* _.isArrayLike('abc');
* // => true
*
* _.isArrayLike(_.noop);
* // => false
*/
function isArrayLike(value) {
return value != null && isLength(value.length) && !isFunction(value);
}
/**
* Checks if `value` is classified as a `Function` object.
*
* @static
* @memberOf _
* @since 0.1.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is a function, else `false`.
* @example
*
* _.isFunction(_);
* // => true
*
* _.isFunction(/abc/);
* // => false
*/
function isFunction(value) {
// The use of `Object#toString` avoids issues with the `typeof` operator
// in Safari 8-9 which returns 'object' for typed array and other constructors.
var tag = isObject(value) ? objectToString.call(value) : '';
return tag == funcTag || tag == genTag;
}
/**
* Checks if `value` is a valid array-like length.
*
* **Note:** This method is loosely based on
* [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
* @example
*
* _.isLength(3);
* // => true
*
* _.isLength(Number.MIN_VALUE);
* // => false
*
* _.isLength(Infinity);
* // => false
*
* _.isLength('3');
* // => false
*/
function isLength(value) {
return typeof value == 'number' &&
value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
}
/**
* Checks if `value` is the
* [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
* of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
*
* @static
* @memberOf _
* @since 0.1.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is an object, else `false`.
* @example
*
* _.isObject({});
* // => true
*
* _.isObject([1, 2, 3]);
* // => true
*
* _.isObject(_.noop);
* // => true
*
* _.isObject(null);
* // => false
*/
function isObject(value) {
var type = typeof value;
return !!value && (type == 'object' || type == 'function');
}
/**
* Checks if `value` is object-like. A value is object-like if it's not `null`
* and has a `typeof` result of "object".
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is object-like, else `false`.
* @example
*
* _.isObjectLike({});
* // => true
*
* _.isObjectLike([1, 2, 3]);
* // => true
*
* _.isObjectLike(_.noop);
* // => false
*
* _.isObjectLike(null);
* // => false
*/
function isObjectLike(value) {
return !!value && typeof value == 'object';
}
/**
* Checks if `value` is classified as a `Symbol` primitive or object.
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
* @example
*
* _.isSymbol(Symbol.iterator);
* // => true
*
* _.isSymbol('abc');
* // => false
*/
function isSymbol(value) {
return typeof value == 'symbol' ||
(isObjectLike(value) && objectToString.call(value) == symbolTag);
}
/**
* Converts `value` to a finite number.
*
* @static
* @memberOf _
* @since 4.12.0
* @category Lang
* @param {*} value The value to convert.
* @returns {number} Returns the converted number.
* @example
*
* _.toFinite(3.2);
* // => 3.2
*
* _.toFinite(Number.MIN_VALUE);
* // => 5e-324
*
* _.toFinite(Infinity);
* // => 1.7976931348623157e+308
*
* _.toFinite('3.2');
* // => 3.2
*/
function toFinite(value) {
if (!value) {
return value === 0 ? value : 0;
}
value = toNumber(value);
if (value === INFINITY || value === -INFINITY) {
var sign = (value < 0 ? -1 : 1);
return sign * MAX_INTEGER;
}
return value === value ? value : 0;
}
/**
* Converts `value` to a number.
*
* @static
* @memberOf _
* @since 4.0.0
* @category Lang
* @param {*} value The value to process.
* @returns {number} Returns the number.
* @example
*
* _.toNumber(3.2);
* // => 3.2
*
* _.toNumber(Number.MIN_VALUE);
* // => 5e-324
*
* _.toNumber(Infinity);
* // => Infinity
*
* _.toNumber('3.2');
* // => 3.2
*/
function toNumber(value) {
if (typeof value == 'number') {
return value;
}
if (isSymbol(value)) {
return NAN;
}
if (isObject(value)) {
var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
value = isObject(other) ? (other + '') : other;
}
if (typeof value != 'string') {
return value === 0 ? value : +value;
}
value = value.replace(reTrim, '');
var isBinary = reIsBinary.test(value);
return (isBinary || reIsOctal.test(value))
? freeParseInt(value.slice(2), isBinary ? 2 : 8)
: (reIsBadHex.test(value) ? NAN : +value);
}
/**
* Produces a random number between the inclusive `lower` and `upper` bounds.
* If only one argument is provided a number between `0` and the given number
* is returned. If `floating` is `true`, or either `lower` or `upper` are
* floats, a floating-point number is returned instead of an integer.
*
* **Note:** JavaScript follows the IEEE-754 standard for resolving
* floating-point values which can produce unexpected results.
*
* @static
* @memberOf _
* @since 0.7.0
* @category Number
* @param {number} [lower=0] The lower bound.
* @param {number} [upper=1] The upper bound.
* @param {boolean} [floating] Specify returning a floating-point number.
* @returns {number} Returns the random number.
* @example
*
* _.random(0, 5);
* // => an integer between 0 and 5
*
* _.random(5);
* // => also an integer between 0 and 5
*
* _.random(5, true);
* // => a floating-point number between 0 and 5
*
* _.random(1.2, 5.2);
* // => a floating-point number between 1.2 and 5.2
*/
function random(lower, upper, floating) {
if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {
upper = floating = undefined;
}
if (floating === undefined) {
if (typeof upper == 'boolean') {
floating = upper;
upper = undefined;
}
else if (typeof lower == 'boolean') {
floating = lower;
lower = undefined;
}
}
if (lower === undefined && upper === undefined) {
lower = 0;
upper = 1;
}
else {
lower = toFinite(lower);
if (upper === undefined) {
upper = lower;
lower = 0;
} else {
upper = toFinite(upper);
}
}
if (lower > upper) {
var temp = lower;
lower = upper;
upper = temp;
}
if (floating || lower % 1 || upper % 1) {
var rand = nativeRandom();
return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper);
}
return baseRandom(lower, upper);
}
module.exports = random;
/***/ })
/******/ ]);
});
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