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backend/node_modules/pretty-hrtime/index.js

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+/*jshint node:true */
+
+"use strict";
+
+var minimalDesc = ['h', 'min', 's', 'ms', 'μs', 'ns'];
+var verboseDesc = ['hour', 'minute', 'second', 'millisecond', 'microsecond', 'nanosecond'];
+var convert = [60*60, 60, 1, 1e6, 1e3, 1];
+
+module.exports = function (source, opts) {
+	var verbose, precise, i, spot, sourceAtStep, valAtStep, decimals, strAtStep, results, totalSeconds;
+
+	verbose = false;
+	precise = false;
+	if (opts) {
+		verbose = opts.verbose || false;
+		precise = opts.precise || false;
+	}
+
+	if (!Array.isArray(source) || source.length !== 2) {
+		return '';
+	}
+	if (typeof source[0] !== 'number' || typeof source[1] !== 'number') {
+		return '';
+	}
+
+	// normalize source array due to changes in node v5.4+
+	if (source[1] < 0) {
+		totalSeconds = source[0] + source[1] / 1e9;
+		source[0] = parseInt(totalSeconds);
+		source[1] = parseFloat((totalSeconds % 1).toPrecision(9)) * 1e9;
+	}
+
+	results = '';
+
+	// foreach unit
+	for (i = 0; i < 6; i++) {
+		spot = i < 3 ? 0 : 1; // grabbing first or second spot in source array
+		sourceAtStep = source[spot];
+		if (i !== 3 && i !== 0) {
+			sourceAtStep = sourceAtStep % convert[i-1]; // trim off previous portions
+		}
+		if (i === 2) {
+			sourceAtStep += source[1]/1e9; // get partial seconds from other portion of the array
+		}
+		valAtStep = sourceAtStep / convert[i]; // val at this unit
+		if (valAtStep >= 1) {
+			if (verbose) {
+				valAtStep = Math.floor(valAtStep); // deal in whole units, subsequent laps will get the decimal portion
+			}
+			if (!precise) {
+				// don't fling too many decimals
+				decimals = valAtStep >= 10 ? 0 : 2;
+				strAtStep = valAtStep.toFixed(decimals);
+			} else {
+				strAtStep = valAtStep.toString();
+			}
+			if (strAtStep.indexOf('.') > -1 && strAtStep[strAtStep.length-1] === '0') {
+				strAtStep = strAtStep.replace(/\.?0+$/,''); // remove trailing zeros
+			}
+			if (results) {
+				results += ' '; // append space if we have a previous value
+			}
+			results += strAtStep; // append the value
+			// append units
+			if (verbose) {
+				results += ' '+verboseDesc[i];
+				if (strAtStep !== '1') {
+					results += 's';
+				}
+			} else {
+				results += ' '+minimalDesc[i];
+			}
+			if (!verbose) {
+				break; // verbose gets as many groups as necessary, the rest get only one
+			}
+		}
+	}
+
+	return results;
+};