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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
cr.define('discards', function() {
'use strict';
// The following variables are initialized by 'initialize'.
// Points to the DiscardsDetailsProviderRemote.
let discardsDetailsProvider;
/**
* @return {!mojom.DiscardsDetailsProviderRemote} Provides discards details.
*/
function getOrCreateDetailsProvider() {
if (!discardsDetailsProvider) {
discardsDetailsProvider = mojom.DiscardsDetailsProvider.getRemote();
}
return discardsDetailsProvider;
}
/**
* Pluralizes a string according to the given count. Assumes that appending an
* 's' is sufficient to make a string plural.
* @param {string} s The string to be made plural if necessary.
* @param {number} n The count of the number of ojects.
* @return {string} The plural version of |s| if n != 1, otherwise |s|.
*/
function maybeMakePlural(s, n) {
return n == 1 ? s : s + 's';
}
/**
* Converts a |seconds| interval to a user friendly string.
* @param {number} seconds The interval to render.
* @return {string} An English string representing the interval.
*/
function secondsToString(seconds) {
// These constants aren't perfect, but close enough.
const SECONDS_PER_MINUTE = 60;
const MINUTES_PER_HOUR = 60;
const SECONDS_PER_HOUR = SECONDS_PER_MINUTE * MINUTES_PER_HOUR;
const HOURS_PER_DAY = 24;
const SECONDS_PER_DAY = SECONDS_PER_HOUR * HOURS_PER_DAY;
const DAYS_PER_WEEK = 7;
const SECONDS_PER_WEEK = SECONDS_PER_DAY * DAYS_PER_WEEK;
const SECONDS_PER_MONTH = SECONDS_PER_DAY * 30.5;
const SECONDS_PER_YEAR = SECONDS_PER_DAY * 365;
// Seconds.
if (seconds < SECONDS_PER_MINUTE) {
return seconds.toString() + maybeMakePlural(' second', seconds);
}
// Minutes.
let minutes = Math.floor(seconds / SECONDS_PER_MINUTE);
if (minutes < MINUTES_PER_HOUR) {
return minutes.toString() + maybeMakePlural(' minute', minutes);
}
// Hours and minutes.
const hours = Math.floor(seconds / SECONDS_PER_HOUR);
minutes = minutes % MINUTES_PER_HOUR;
if (hours < HOURS_PER_DAY) {
let s = hours.toString() + maybeMakePlural(' hour', hours);
if (minutes > 0) {
s += ' and ' + minutes.toString() + maybeMakePlural(' minute', minutes);
}
return s;
}
// Days.
const days = Math.floor(seconds / SECONDS_PER_DAY);
if (days < DAYS_PER_WEEK) {
return days.toString() + maybeMakePlural(' day', days);
}
// Weeks. There's an awkward gap to bridge where 4 weeks can have
// elapsed but not quite 1 month. Be sure to use weeks to report that.
const weeks = Math.floor(seconds / SECONDS_PER_WEEK);
const months = Math.floor(seconds / SECONDS_PER_MONTH);
if (months < 1) {
return 'over ' + weeks.toString() + maybeMakePlural(' week', weeks);
}
// Months.
const years = Math.floor(seconds / SECONDS_PER_YEAR);
if (years < 1) {
return 'over ' + months.toString() + maybeMakePlural(' month', months);
}
// Years.
return 'over ' + years.toString() + maybeMakePlural(' year', years);
}
/**
* Converts a |secondsAgo| duration to a user friendly string.
* @param {number} secondsAgo The duration to render.
* @return {string} An English string representing the duration.
*/
function durationToString(secondsAgo) {
const ret = secondsToString(secondsAgo);
if (ret.endsWith(' seconds') || ret.endsWith(' second')) {
return 'just now';
}
return ret + ' ago';
}
/**
* Returns a string representation of a boolean value for display in a table.
* @param {boolean} bool A boolean value.
* @return {string} A string representing the bool.
*/
function boolToString(bool) {
return bool ? '✔' : '✘️';
}
// These functions are exposed on the 'discards' object created by
// cr.define. This allows unittesting of these functions.
return {
boolToString: boolToString,
durationToString: durationToString,
getOrCreateDetailsProvider: getOrCreateDetailsProvider,
maybeMakePlural: maybeMakePlural,
secondsToString: secondsToString
};
});
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