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'use strict';
const internals = {
kCircularString: '[Circular]',
kAnsiCodes: {
bold: '[1m',
italics: '[3m',
underline: '[4m',
inverse: '[7m',
strikethrough: '[9m',
bold_off: '[22m',
italics_off: '[23m',
underline_off: '[24m',
inverse_off: '[27m',
strikethrough_off: '[29m',
black: '[30m',
red: '[31m',
green: '[32m',
yellow: '[33m',
blue: '[34m',
magenta: '[35m',
cyan: '[36m',
white: '[37m',
default: '[39m',
black_bg: '[40m',
red_bg: '[41m',
green_bg: '[42m',
yellow_bg: '[43m',
blue_bg: '[44m',
magenta_bg: '[45m',
cyan_bg: '[46m',
white_bg: '[47m',
default_bg: '[49m',
reset: '[0m'
},
// Get High Res time depending on platform. Currently only supporting node.
getHighResTime() {
return process.hrtime.bigint();
}
};
// Initialise relative time.
internals.initialTimestamp = BigInt(Date.now()) * 1000000n;
internals.initialHighResTime = internals.getHighResTime();
/**
* Container object for utilities used by loggers.
*
* @class Utilities
*/
module.exports = {
/**
* Returns the current timestamp in nanoseconds as a bigint.
*
* @function now
* @memberof Utilities
* @return {bigint} current time in nanoseconds, including fractions.
*/
now() {
return internals.initialTimestamp + internals.getHighResTime() - internals.initialHighResTime;
},
/**
* Stringifies objects, avoiding circular references.
*
* @function stringify
* @memberof Utilities
* @param {Object} object the object to stringify
* @return {String} the stringified object
*/
stringify(object) {
const cache = new Set();
return JSON.stringify(object, (key, value) => {
if (typeof value === 'bigint') {
return String(value) + 'n';
}
if (typeof value === 'object' && value !== null) {
if (cache.has(value)) {
return internals.kCircularString;
}
cache.add(value);
}
return value;
});
},
/**
* Given an ansi keyword, it will return the appropriate code.
*
* @function getAnsiCode
* @memberof Utilities
* @param {String} ansiString the name of the desired code
* @return {String} the ansi code
*/
getAnsiCode(ansiString) {
return internals.kAnsiCodes[ansiString] || internals.kAnsiCodes.reset;
},
/**
* Given a level, it will return the appropriate ansi keyword related
* to it.
*
* @function getLevelAnsi
* @memberof Utilities
* @param {number} level the level of the log
* @return {String} the ansi keyword
*/
getLevelAnsi(level) {
switch (level) {
case 0:
case 1:
case 2:
case 3:
return 'red';
case 4:
return 'yellow';
case 5:
case 6:
return 'blue';
case 7:
return 'green';
default:
return 'default';
}
}
};
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