Add library to parse Jacoco reports

lib/impl/jacoco.js

@@ -0,0 +1,74 @@
+(function (jacocoParse, Promise, Joi, logger, util, path) {
+    'use strict';
+
+    var jacocoStringValidation = Joi.string().required();
+    var optionsValidation = Joi.object().keys().optional();
+
+    module.exports = {
+        parse: function parseJacoco(pathPrefix, jacocoString, options) {
+            return new Promise(function (resolve, reject) {
+                logger.debug('Parsing Jacoco Data');
+                var validLcov = Joi.validate(jacocoString, jacocoStringValidation);
+                var validOptions = Joi.validate(options, optionsValidation, {
+                    stripUnknown: true
+                });
+                var validationError = validLcov.error || validOptions.error;
+
+                if (validationError) {
+                    logger.error(validationError);
+                    return reject(validationError);
+                }
+
+                jacocoParse.parseContent(jacocoString, function (err, data) {
+                    if (err) {
+                        err = new Error(err);
+
+                        logger.error(err);
+                        return reject(err);
+                    }
+
+                    var result = {
+                        total: 0,
+                        fileReports: []
+                    };
+                    var totalLines = 0;
+                    var totalHits = 0;
+
+                    //TODO: Convert to reduce function
+                    data.forEach(function (stats) {
+                        var fileStats = {
+                            // The API expects the filenames to be relative to the project, ex. lib/reporter.js
+                            filename: stats.file ? pathPrefix + path.relative(process.cwd(), stats.file) : '',
+                            coverage: {}
+                        };
+
+                        totalLines += stats.lines.found;
+                        totalHits += stats.lines.hit;
+
+                        // The API uses integers only, so convert accordingly.
+                        fileStats.total = Math.floor(util.safeDivision(stats.lines.hit, stats.lines.found) * 100);
+
+                        //TODO: Convert to reduce function
+                        stats.lines.details.forEach(function (detail) {
+                            // Codacy needs the 0s to know failed coverage data
+                            // We also can't have a negative number of hits on a line, so exclude those.
+                            if (detail.hit >= 0) {
+                                fileStats.coverage[detail.line] = detail.hit;
+                            }
+                        });
+
+                        logger.trace('Successfully parsed ' + stats.file);
+                        result.fileReports.push(fileStats);
+                    });
+
+                    // The API uses integers only, so convert accordingly.
+                    result.total = Math.floor(util.safeDivision(totalHits, totalLines) * 100);
+
+                    logger.debug('Successfully Parsed Jacoco Data');
+
+                    resolve(result);
+                });
+            });
+        }
+    };
+}(require('jacoco-parse'), require('bluebird'), require('joi'), require('../logger')(), require('../util'), require('path')));