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/**
* @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];
/* istanbul ignore next */
/**
* display the data
* @param {Object} data Data object to be displayed
* @returns {string} modified string
* @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, 10);
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
};
}());