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109 lines
2.9 KiB
JavaScript
109 lines
2.9 KiB
JavaScript
// Borrowed from the Droll library by thebinarypenguin
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// https://github.com/thebinarypenguin/droll
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// Licensed under MIT license
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var droll = {};
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// Define a "class" to represent a formula
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function DrollFormula() {
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this.numDice = 0;
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this.numSides = 0;
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this.modifier = 0;
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this.minResult = 0;
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this.maxResult = 0;
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this.avgResult = 0;
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}
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// Define a "class" to represent the results of the roll
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function DrollResult() {
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this.rolls = [];
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this.modifier = 0;
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this.total = 0;
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}
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/**
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* Returns a string representation of the roll result
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*/
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DrollResult.prototype.toString = function () {
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if (this.rolls.length === 1 && this.modifier === 0) {
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return this.rolls[0] + '';
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}
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if (this.rolls.length > 1 && this.modifier === 0) {
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return this.rolls.join(' + ') + ' = ' + this.total;
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}
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if (this.rolls.length === 1 && this.modifier > 0) {
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return this.rolls[0] + ' + ' + this.modifier + ' = ' + this.total;
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}
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if (this.rolls.length > 1 && this.modifier > 0) {
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return this.rolls.join(' + ') + ' + ' + this.modifier + ' = ' + this.total;
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}
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if (this.rolls.length === 1 && this.modifier < 0) {
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return this.rolls[0] + ' - ' + Math.abs(this.modifier) + ' = ' + this.total;
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}
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if (this.rolls.length > 1 && this.modifier < 0) {
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return this.rolls.join(' + ') + ' - ' + Math.abs(this.modifier) + ' = ' + this.total;
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}
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};
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/**
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* Parse the formula into its component pieces.
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* Returns a DrollFormula object on success or false on failure.
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*/
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droll.parse = function (formula) {
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var pieces = null;
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var result = new DrollFormula();
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pieces = formula.match(/^([1-9]\d*)?d([1-9]\d*)([+-]\d+)?$/i);
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if (!pieces) { return false; }
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result.numDice = (pieces[1] - 0) || 1;
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result.numSides = (pieces[2] - 0);
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result.modifier = (pieces[3] - 0) || 0;
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result.minResult = (result.numDice * 1) + result.modifier;
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result.maxResult = (result.numDice * result.numSides) + result.modifier;
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result.avgResult = (result.maxResult + result.minResult) / 2;
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return result;
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};
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/**
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* Test the validity of the formula.
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* Returns true on success or false on failure.
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*/
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droll.validate = function (formula) {
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return (droll.parse(formula)) ? true : false;
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};
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/**
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* Roll the dice defined by the formula.
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* Returns a DrollResult object on success or false on failure.
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*/
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droll.roll = function (formula) {
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var pieces = null;
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var result = new DrollResult();
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pieces = droll.parse(formula);
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if (!pieces) { return false; }
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for (var a = 0; a < pieces.numDice; a++) {
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result.rolls[a] = (1 + Math.floor(Math.random() * pieces.numSides));
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}
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result.modifier = pieces.modifier;
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for (var b = 0; b < result.rolls.length; b++) {
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result.total += result.rolls[b];
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}
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result.total += result.modifier;
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return result;
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};
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// END OF DROLL CODE
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