scripts/transform-coverage.js

   1 #!/usr/bin/env node
   2 /**
   3  * This script applies a source map to LCOV data. If you have coverage data for
   4  * a concatenated file, plus a source map, this will output LCOV data for your
   5  * original source files.
   6  *
   7  * Usage:
   8  *
   9  *   transform-coverage.js path/to/soure.map path/to/coverage.lcov > out.lcov
  10  */
  11
  12 // TODO: make this a command line argument
  13 var SOURCE = 'src/';  // only report files under this directory
  14
  15 var assert = require('assert'),
  16     fs = require('fs'),
  17     lcovParse = require('lcov-parse'),
  18     parseDataUri = require('parse-data-uri'),
  19     sourcemap = require('source-map');
  20
  21 var sourcemapFile = process.argv[2];
  22 var lcovFile = process.argv[3];
  23
  24 var sourcemapData = fs.readFileSync(sourcemapFile).toString();
  25 var sourcemap = new sourcemap.SourceMapConsumer(sourcemapData);
  26
  27 lcovParse(lcovFile, function(err, data) {
  28   assert(!err);
  29   // TODO: 0 --> the correct file
  30   var lines = data[0].lines.details;
  31
  32   var fileToCov = {};  // filename -> { line num -> hits }
  33
  34   lines.forEach(function(line) {
  35     var pos = sourcemap.originalPositionFor({line: line.line, column: 0});
  36     if (pos == null) {
  37       return;
  38     }
  39
  40     var filename = pos.source;
  41
  42     // Test coverage of node_modules is never interesting.
  43     if (!filename || filename.indexOf('node_modules') >= 0) {
  44       return;
  45     }
  46
  47     // Strip paths down to the source root.
  48     var base = filename.indexOf(SOURCE);
  49     if (base == -1) return;
  50     filename = filename.slice(base);
  51
  52     if (!fileToCov[filename]) fileToCov[filename] = [];
  53     fileToCov[filename][pos.line] = line.hit;
  54   });
  55
  56   // Other LCOV fields to translate:
  57   // FN:2454
  58   // FNF:465
  59   // FNH:410
  60   // FNDA:1,(anonymous_1)
  61   // LF:4570
  62   // LH:4002
  63   // BRDA:13,1,0,1
  64   // BRF:2213
  65   // BRH:1684
  66
  67   // Convert to LCOV format
  68   for (var filename in fileToCov) {
  69     var cov = fileToCov[filename]
  70     console.log('SF:' + filename);
  71     for (var i = 0; i < cov.length; i++) {
  72       if (cov[i] != null) {
  73         console.log('DA:' + i + ',' + cov[i]);
  74       }
  75     }
  76     console.log('end_of_record');
  77   }
  78 });