Initial push, working on test cases

src/utilities.js

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+/*
+ * Copyright (C) Noverant, Inc - All Rights Reserved Unauthorized copying of this file, via any
+ * medium is strictly prohibited Proprietary and confidential
+ */
+
+// @flow
+export const SECONDS_PER_SECOND = 1;
+export const SECONDS_PER_MINUTE = 60;
+export const SECONDS_PER_HOUR = 60 * SECONDS_PER_MINUTE;
+export const SECONDS_PER_DAY = 24 * SECONDS_PER_HOUR;
+
+const designations = [
+    ['D', SECONDS_PER_DAY],
+    ['H', SECONDS_PER_HOUR],
+    ['M', SECONDS_PER_MINUTE],
+    ['S', SECONDS_PER_SECOND],
+];
+
+/**
+ * Converts a Number to a String of HH:MM:SS
+ *
+ * @param totalSeconds
+ * @returns {string}
+ */
+export function getSecondsAsHHMMSS(totalSeconds: Number) {
+    // SCORM spec does not deal with negative durations, give zero back
+    if(!totalSeconds || totalSeconds <= 0) {
+        return '00:00:00';
+    }
+
+    let hours = Math.floor(totalSeconds / SECONDS_PER_HOUR);
+
+    let dateObj = new Date(totalSeconds * 1000);
+    let minutes = dateObj.getUTCMinutes();
+    let seconds = dateObj.getSeconds();
+
+    return hours.toString().padStart(2, '0') + ':' +
+        minutes.toString().padStart(2, '0') + ':' +
+        seconds.toString().padStart(2, '0');
+}
+
+/**
+ * Calculate the number of seconds from ISO 8601 Duration
+ *
+ * @param seconds
+ * @returns {String}
+ */
+export function getSecondsAsISODuration(seconds: Number) {
+    // SCORM spec does not deal with negative durations, give zero back
+    if(!seconds || seconds <= 0) {
+        return 'P0S';
+    }
+
+    let duration = 'P';
+    let remainder = seconds;
+
+    designations.forEach(([sign, current_seconds]) => {
+        const value = Math.floor(remainder / current_seconds);
+
+        remainder = remainder % current_seconds;
+
+        if (value) {
+            duration += `${value}${sign}`;
+        }
+    });
+
+    return duration;
+}
+
+/**
+ * Calculate the number of seconds from HH:MM:SS.DDDDDD
+ *
+ * @param timeString
+ * @param timeRegex
+ * @returns {number}
+ */
+export function getTimeAsSeconds(timeString: String, timeRegex: RegExp) {
+    if(!timeString || typeof timeString !== 'string' || !timeString.match(timeRegex)) {
+        return 0;
+    }
+    const parts = timeString.split(':');
+    const hours = Number(parts[0]);
+    const minutes = Number(parts[1]);
+    const seconds = Number(parts[2]);
+    return (hours * 3600) + (minutes * 60) + seconds;
+}
+
+/**
+ * Calculate the number of seconds from ISO 8601 Duration
+ *
+ * @param duration
+ * @param durationRegex
+ * @returns {number}
+ */
+export function getDurationAsSeconds(duration: String, durationRegex: RegExp) {
+    if(!duration || !duration.match(durationRegex)) {
+        return 0;
+    }
+
+    let [,years,months,,days,hours,minutes,seconds] = new RegExp(durationRegex).exec(duration) || [];
+
+    let now = new Date();
+    let anchor = new Date(now);
+    anchor.setFullYear(anchor.getFullYear() + Number(years || 0));
+    anchor.setMonth(anchor.getMonth() + Number(months || 0));
+    anchor.setDate(anchor.getDate() + Number(days || 0));
+    anchor.setHours(anchor.getHours() + Number(hours || 0));
+    anchor.setMinutes(anchor.getMinutes() + Number(minutes || 0));
+    anchor.setSeconds(anchor.getSeconds() + Number(seconds || 0));
+    if(seconds) {
+        let milliseconds = Number(Number(seconds) % 1).toFixed(6) * 1000.0;
+        anchor.setMilliseconds(anchor.getMilliseconds() + milliseconds);
+    }
+
+    return (anchor - now) / 1000.0;
+}