--- /dev/null
+#!/usr/bin/env node
+/**
+ * This script applies a source map to LCOV data. If you have coverage data for
+ * a concatenated file, plus a source map, this will output LCOV data for your
+ * original source files.
+ *
+ * Usage:
+ *
+ * transform-coverage.js path/to/soure.map path/to/coverage.lcov > out.lcov
+ */
+
+// TODO: make this a command line argument
+var SOURCE = 'src/'; // only report files under this directory
+
+var assert = require('assert'),
+ fs = require('fs'),
+ lcovParse = require('lcov-parse'),
+ parseDataUri = require('parse-data-uri'),
+ sourcemap = require('source-map');
+
+var sourcemapFile = process.argv[2];
+var lcovFile = process.argv[3];
+
+var sourcemapData = fs.readFileSync(sourcemapFile).toString();
+var sourcemap = new sourcemap.SourceMapConsumer(sourcemapData);
+
+lcovParse(lcovFile, function(err, data) {
+ assert(!err);
+ // TODO: 0 --> the correct file
+ var lines = data[0].lines.details;
+
+ var fileToCov = {}; // filename -> { line num -> hits }
+
+ lines.forEach(function(line) {
+ var pos = sourcemap.originalPositionFor({line: line.line, column: 0});
+ if (pos == null) {
+ return;
+ }
+
+ var filename = pos.source;
+
+ // Test coverage of node_modules is never interesting.
+ if (!filename || filename.indexOf('node_modules') >= 0) {
+ return;
+ }
+
+ // Strip paths down to the source root.
+ var base = filename.indexOf(SOURCE);
+ if (base == -1) return;
+ filename = filename.slice(base);
+
+ if (!fileToCov[filename]) fileToCov[filename] = [];
+ fileToCov[filename][pos.line] = line.hit;
+ });
+
+ // Other LCOV fields to translate:
+ // FN:2454
+ // FNF:465
+ // FNH:410
+ // FNDA:1,(anonymous_1)
+ // LF:4570
+ // LH:4002
+ // BRDA:13,1,0,1
+ // BRF:2213
+ // BRH:1684
+
+ // Convert to LCOV format
+ for (var filename in fileToCov) {
+ var cov = fileToCov[filename]
+ console.log('SF:' + filename);
+ for (var i = 0; i < cov.length; i++) {
+ if (cov[i] != null) {
+ console.log('DA:' + i + ',' + cov[i]);
+ }
+ }
+ console.log('end_of_record');
+ }
+});