1 files changed, 57 insertions, 0 deletions
diff --git a/node_modules/nyc/lib/source-maps.js b/node_modules/nyc/lib/source-maps.js
new file mode 100644
index 000000000..c3238544c
--- /dev/null
+++ b/node_modules/nyc/lib/source-maps.js
@@ -0,0 +1,57 @@
+const convertSourceMap = require('convert-source-map')
+const libCoverage = require('istanbul-lib-coverage')
+const libSourceMaps = require('istanbul-lib-source-maps')
+const fs = require('fs')
+const path = require('path')
+
+// TODO: write some unit tests for this class.
+function SourceMaps (opts) {
+  this.cache = opts.cache
+  this.cacheDirectory = opts.cacheDirectory
+  this.sourceMapCache = libSourceMaps.createSourceMapStore()
+  this.loadedMaps = {}
+}
+
+SourceMaps.prototype.extractAndRegister = function (code, filename, hash) {
+  var sourceMap = convertSourceMap.fromSource(code) || convertSourceMap.fromMapFileSource(code, path.dirname(filename))
+  if (sourceMap) {
+    if (this.cache && hash) {
+      var mapPath = path.join(this.cacheDirectory, hash + '.map')
+      fs.writeFileSync(mapPath, sourceMap.toJSON())
+    } else {
+      this.sourceMapCache.registerMap(filename, sourceMap.sourcemap)
+    }
+  }
+  return sourceMap
+}
+
+SourceMaps.prototype.remapCoverage = function (obj) {
+  var transformed = this.sourceMapCache.transformCoverage(
+    libCoverage.createCoverageMap(obj)
+  )
+  return transformed.map.data
+}
+
+SourceMaps.prototype.reloadCachedSourceMaps = function (report) {
+  var _this = this
+  Object.keys(report).forEach(function (absFile) {
+    var fileReport = report[absFile]
+    if (fileReport && fileReport.contentHash) {
+      var hash = fileReport.contentHash
+      if (!(hash in _this.loadedMaps)) {
+        try {
+          var mapPath = path.join(_this.cacheDirectory, hash + '.map')
+          _this.loadedMaps[hash] = JSON.parse(fs.readFileSync(mapPath, 'utf8'))
+        } catch (e) {
+          // set to false to avoid repeatedly trying to load the map
+          _this.loadedMaps[hash] = false
+        }
+      }
+      if (_this.loadedMaps[hash]) {
+        _this.sourceMapCache.registerMap(absFile, _this.loadedMaps[hash])
+      }
+    }
+  })
+}
+
+module.exports = SourceMaps