145 lines
2.7 KiB
JavaScript
145 lines
2.7 KiB
JavaScript
var _ = require('lodash');
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/**
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* Exports
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*/
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module.exports = parseTimestring;
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/**
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* Default options to use when parsing a timestring
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*
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* @type {Object}
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*/
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var defaultOpts = {
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hoursPerDay: 24,
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daysPerWeek: 7,
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weeksPerMonth: 4,
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monthsPerYear: 12,
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};
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/**
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* Map of accepted strings to unit
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*
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* @type {Object}
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*/
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var unitMap = {
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ms: ['ms', 'milli', 'millisecond', 'milliseconds'],
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s: ['s', 'sec', 'secs', 'second', 'seconds'],
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m: ['m', 'min', 'mins', 'minute', 'minutes'],
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h: ['h', 'hr', 'hrs', 'hour', 'hours'],
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d: ['d', 'day', 'days'],
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w: ['w', 'week', 'weeks'],
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mth: ['mon', 'mth', 'mths','month', 'months'],
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y: ['y', 'yr', 'yrs', 'year', 'years'],
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};
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/**
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* Parse a timestring
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*
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* @param {string} string
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* @param {string} [returnUnit]
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* @param {Object} [opts]
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* @return {number}
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*/
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function parseTimestring(string, returnUnit, opts) {
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opts = _.extend(_.clone(defaultOpts), opts || {});
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var totalSeconds = 0;
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var unitValues = getUnitValues(opts);
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var groups = string
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.toLowerCase()
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.replace(/[^\.\w+-]+/g, '')
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.match(/[-+]?[0-9]+[a-z]+/g);
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if (groups !== null) {
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_.each(groups, function(group) {
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var value = group.match(/[0-9]+/g)[0];
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var unit = group.match(/[a-z]+/g)[0];
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totalSeconds += getSeconds(value, unit, unitValues);
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});
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}
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if (returnUnit) {
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return convert(totalSeconds, returnUnit, unitValues);
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}
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return totalSeconds;
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}
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/**
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* Get unit values based on the passed options
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*
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* @param {Object} opts
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* @returns {Object}
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*/
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function getUnitValues(opts) {
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var unitValues = {
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ms: 0.001,
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s: 1,
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m: 60,
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h: 3600,
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};
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unitValues.d = opts.hoursPerDay * unitValues.h;
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unitValues.w = opts.daysPerWeek * unitValues.d;
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unitValues.mth = opts.weeksPerMonth * unitValues.w;
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unitValues.y = opts.monthsPerYear * unitValues.mth;
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return unitValues;
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}
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/**
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* Get the key for a unit
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*
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* @param {string} unit
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* @returns {string}
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*/
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function getUnitKey(unit) {
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for (var k in unitMap) {
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for (var u in unitMap[k]) {
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if (unit === unitMap[k][u]) {
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return k;
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}
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}
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}
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throw new Error('The unit [' + unit + '] is not supported by timestring');
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}
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/**
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* Get the number of seconds for a value, based on the unit
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*
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* @param {number} value
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* @param {string} unit
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* @param {Object} unitValues
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* @returns {number}
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*/
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function getSeconds(value, unit, unitValues) {
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var baseValue = unitValues[getUnitKey(unit)];
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return value * baseValue;
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}
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/**
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* Convert a value from its existing unit to a new unit
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*
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* @param {number} value
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* @param {string} unit
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* @param {Object} unitValues
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* @returns {number}
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*/
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function convert(value, unit, unitValues) {
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var baseValue = unitValues[getUnitKey(unit)];
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return value / baseValue;
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}
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