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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
this.EXPORTED_SYMBOLS = [
"CoverageCollector",
]
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
const {TextEncoder, OS} = Cu.import("resource://gre/modules/osfile.jsm", {});
const {addDebuggerToGlobal} = Cu.import("resource://gre/modules/jsdebugger.jsm",
{});
addDebuggerToGlobal(this);
/**
* Records coverage for each test by way of the js debugger.
*/
this.CoverageCollector = function (prefix) {
this._prefix = prefix;
this._dbg = new Debugger();
this._dbg.collectCoverageInfo = true;
this._dbg.addAllGlobalsAsDebuggees();
this._scripts = this._dbg.findScripts();
this._dbg.onNewScript = (script) => {
this._scripts.push(script);
};
// Source -> coverage data;
this._allCoverage = {};
this._encoder = new TextEncoder();
this._testIndex = 0;
}
CoverageCollector.prototype._getLinesCovered = function () {
let coveredLines = {};
let currentCoverage = {};
this._scripts.forEach(s => {
let scriptName = s.url;
let cov = s.getOffsetsCoverage();
if (!cov) {
return;
}
cov.forEach(covered => {
let {lineNumber, columnNumber, offset, count} = covered;
if (!count) {
return;
}
if (!currentCoverage[scriptName]) {
currentCoverage[scriptName] = {};
}
if (!this._allCoverage[scriptName]) {
this._allCoverage[scriptName] = {};
}
let key = [lineNumber, columnNumber, offset].join('#');
if (!currentCoverage[scriptName][key]) {
currentCoverage[scriptName][key] = count;
} else {
currentCoverage[scriptName][key] += count;
}
});
});
// Covered lines are determined by comparing every offset mentioned as of the
// the completion of a test to the last time we measured coverage. If an
// offset in a line is novel as of this test, or a count has increased for
// any offset on a particular line, that line must have been covered.
for (let scriptName in currentCoverage) {
for (let key in currentCoverage[scriptName]) {
if (!this._allCoverage[scriptName] ||
!this._allCoverage[scriptName][key] ||
(this._allCoverage[scriptName][key] <
currentCoverage[scriptName][key])) {
let [lineNumber, colNumber, offset] = key.split('#');
if (!coveredLines[scriptName]) {
coveredLines[scriptName] = new Set();
}
coveredLines[scriptName].add(parseInt(lineNumber, 10));
this._allCoverage[scriptName][key] = currentCoverage[scriptName][key];
}
}
}
return coveredLines;
}
CoverageCollector.prototype._getUncoveredLines = function() {
let uncoveredLines = {};
this._scripts.forEach(s => {
let scriptName = s.url;
let scriptOffsets = s.getAllOffsets();
if (!uncoveredLines[scriptName]){
uncoveredLines[scriptName] = new Set();
}
// Get all lines in the script
scriptOffsets.forEach( function(element, index) {
if (!element){
return;
}
uncoveredLines[scriptName].add(index);
});
});
// For all covered lines, delete their entry
for (let scriptName in this._allCoverage){
for (let key in this._allCoverage[scriptName]){
let [lineNumber, columnNumber, offset] = key.split('#');
uncoveredLines[scriptName].delete(parseInt(lineNumber, 10));
}
}
return uncoveredLines;
}
CoverageCollector.prototype._getMethodNames = function() {
let methodNames = {};
this._scripts.forEach(s => {
let method = s.displayName;
// If the method name is undefined, we return early
if (!method){
return;
}
let scriptName = s.url;
let tempMethodCov = [];
let scriptOffsets = s.getAllOffsets();
if (!methodNames[scriptName]){
methodNames[scriptName] = {};
}
/**
* Get all lines contained within the method and
* push a record of the form:
* <method name> : <lines covered>
*/
scriptOffsets.forEach(function (element, index){
if (!element){
return;
}
tempMethodCov.push(index);
});
methodNames[scriptName][method] = tempMethodCov;
});
return methodNames;
}
/**
* Records lines covered since the last time coverage was recorded,
* associating them with the given test name. The result is written
* to a json file in a specified directory.
*/
CoverageCollector.prototype.recordTestCoverage = function (testName) {
dump("Collecting coverage for: " + testName + "\n");
let rawLines = this._getLinesCovered(testName);
let methods = this._getMethodNames();
let uncoveredLines = this._getUncoveredLines();
let result = [];
let versionControlBlock = {version: 1.0};
result.push(versionControlBlock);
for (let scriptName in rawLines) {
let rec = {
testUrl: testName,
sourceFile: scriptName,
methods: {},
covered: [],
uncovered: []
};
for (let methodName in methods[scriptName]){
rec.methods[methodName] = methods[scriptName][methodName];
}
for (let line of rawLines[scriptName]) {
rec.covered.push(line);
}
for (let line of uncoveredLines[scriptName]){
rec.uncovered.push(line);
}
result.push(rec);
}
let arr = this._encoder.encode(JSON.stringify(result, null, 2));
let path = this._prefix + '/' + 'jscov_' + Date.now() + '.json';
dump("Writing coverage to: " + path + "\n");
return OS.File.writeAtomic(path, arr, {tmpPath: path + '.tmp'});
}
/**
* Tear down the debugger after all tests are complete.
*/
CoverageCollector.prototype.finalize = function () {
this._dbg.removeAllDebuggees();
this._dbg.enabled = false;
}
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