94 lines
1.9 KiB
JavaScript
94 lines
1.9 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var getGlobal = require( '@stdlib/utils/global' );
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var isObject = require( '@stdlib/assert/is-object' );
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var modf = require( '@stdlib/math/base/special/modf' );
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var round = require( '@stdlib/math/base/special/round' );
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var now = require( './now.js' );
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// VARIABLES //
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var Global = getGlobal();
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var ts;
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var ns;
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if ( isObject( Global.performance ) ) {
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ns = Global.performance;
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} else {
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ns = {};
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}
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if ( ns.now ) {
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ts = ns.now.bind( ns );
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} else if ( ns.mozNow ) {
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ts = ns.mozNow.bind( ns );
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} else if ( ns.msNow ) {
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ts = ns.msNow.bind( ns );
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} else if ( ns.oNow ) {
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ts = ns.oNow.bind( ns );
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} else if ( ns.webkitNow ) {
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ts = ns.webkitNow.bind( ns );
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} else {
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ts = now;
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}
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// MAIN //
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/**
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* Returns a high-resolution time.
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*
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* ## Notes
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*
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* - Output format: `[seconds, nanoseconds]`.
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*
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*
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* @private
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* @returns {NumberArray} high-resolution time
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*
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* @example
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* var t = tic();
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* // returns [<number>,<number>]
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*/
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function tic() {
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var parts;
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var t;
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// Get a millisecond timestamp and convert to seconds:
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t = ts() / 1000;
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// Decompose the timestamp into integer (seconds) and fractional parts:
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parts = modf( t );
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// Convert the fractional part to nanoseconds:
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parts[ 1 ] = round( parts[1] * 1.0e9 );
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// Return the high-resolution time:
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return parts;
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}
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// EXPORTS //
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module.exports = tic;
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