/**
|
* @fileoverview Tracks performance of individual rules.
|
* @author Brandon Mills
|
*/
|
|
"use strict";
|
|
//------------------------------------------------------------------------------
|
// Helpers
|
//------------------------------------------------------------------------------
|
|
/* istanbul ignore next */
|
/**
|
* Align the string to left
|
* @param {string} str string to evaluate
|
* @param {int} len length of the string
|
* @param {string} ch delimiter character
|
* @returns {string} modified string
|
* @private
|
*/
|
function alignLeft(str, len, ch) {
|
return str + new Array(len - str.length + 1).join(ch || " ");
|
}
|
|
/* istanbul ignore next */
|
/**
|
* Align the string to right
|
* @param {string} str string to evaluate
|
* @param {int} len length of the string
|
* @param {string} ch delimiter character
|
* @returns {string} modified string
|
* @private
|
*/
|
function alignRight(str, len, ch) {
|
return new Array(len - str.length + 1).join(ch || " ") + str;
|
}
|
|
//------------------------------------------------------------------------------
|
// Module definition
|
//------------------------------------------------------------------------------
|
|
const enabled = !!process.env.TIMING;
|
|
const HEADERS = ["Rule", "Time (ms)", "Relative"];
|
const ALIGN = [alignLeft, alignRight, alignRight];
|
|
/**
|
* Decide how many rules to show in the output list.
|
* @returns {number} the number of rules to show
|
*/
|
function getListSize() {
|
const MINIMUM_SIZE = 10;
|
|
if (typeof process.env.TIMING !== "string") {
|
return MINIMUM_SIZE;
|
}
|
|
if (process.env.TIMING.toLowerCase() === "all") {
|
return Number.POSITIVE_INFINITY;
|
}
|
|
const TIMING_ENV_VAR_AS_INTEGER = Number.parseInt(process.env.TIMING, 10);
|
|
return TIMING_ENV_VAR_AS_INTEGER > 10 ? TIMING_ENV_VAR_AS_INTEGER : MINIMUM_SIZE;
|
}
|
|
/* istanbul ignore next */
|
/**
|
* display the data
|
* @param {Object} data Data object to be displayed
|
* @returns {void} prints modified string with console.log
|
* @private
|
*/
|
function display(data) {
|
let total = 0;
|
const rows = Object.keys(data)
|
.map(key => {
|
const time = data[key];
|
|
total += time;
|
return [key, time];
|
})
|
.sort((a, b) => b[1] - a[1])
|
.slice(0, getListSize());
|
|
rows.forEach(row => {
|
row.push(`${(row[1] * 100 / total).toFixed(1)}%`);
|
row[1] = row[1].toFixed(3);
|
});
|
|
rows.unshift(HEADERS);
|
|
const widths = [];
|
|
rows.forEach(row => {
|
const len = row.length;
|
|
for (let i = 0; i < len; i++) {
|
const n = row[i].length;
|
|
if (!widths[i] || n > widths[i]) {
|
widths[i] = n;
|
}
|
}
|
});
|
|
const table = rows.map(row => (
|
row
|
.map((cell, index) => ALIGN[index](cell, widths[index]))
|
.join(" | ")
|
));
|
|
table.splice(1, 0, widths.map((width, index) => {
|
const extraAlignment = index !== 0 && index !== widths.length - 1 ? 2 : 1;
|
|
return ALIGN[index](":", width + extraAlignment, "-");
|
}).join("|"));
|
|
console.log(table.join("\n")); // eslint-disable-line no-console
|
}
|
|
/* istanbul ignore next */
|
module.exports = (function() {
|
|
const data = Object.create(null);
|
|
/**
|
* Time the run
|
* @param {*} key key from the data object
|
* @param {Function} fn function to be called
|
* @returns {Function} function to be executed
|
* @private
|
*/
|
function time(key, fn) {
|
if (typeof data[key] === "undefined") {
|
data[key] = 0;
|
}
|
|
return function(...args) {
|
let t = process.hrtime();
|
|
fn(...args);
|
t = process.hrtime(t);
|
data[key] += t[0] * 1e3 + t[1] / 1e6;
|
};
|
}
|
|
if (enabled) {
|
process.on("exit", () => {
|
display(data);
|
});
|
}
|
|
return {
|
time,
|
enabled,
|
getListSize
|
};
|
|
}());
|
