--- /dev/null
+/* @flow */
+"use strict";
+
+const debug = require("debug")("stylelint:file-cache");
+const fileEntryCache = require("file-entry-cache");
+const getCacheFile = require("./getCacheFile");
+const path = require("path");
+
+const DEFAULT_CACHE_LOCATION = "./.stylelintcache";
+const DEFAULT_HASH = "";
+
+function FileCache(cacheLocation /*: ?string */, hashOfConfig /*: ?string */) {
+ const cacheFile = path.resolve(
+ getCacheFile(cacheLocation || DEFAULT_CACHE_LOCATION, process.cwd())
+ );
+ debug(`Cache file is created at ${cacheFile}`);
+ this._fileCache = fileEntryCache.create(cacheFile);
+ this._hashOfConfig = hashOfConfig || DEFAULT_HASH;
+}
+
+FileCache.prototype.hasFileChanged = function(absoluteFilepath) {
+ // Get file descriptor compares current metadata against cached
+ // one and stores the result to "changed" prop.w
+ const descriptor = this._fileCache.getFileDescriptor(absoluteFilepath);
+ const meta = descriptor.meta || {};
+ const changed =
+ descriptor.changed || meta.hashOfConfig !== this._hashOfConfig;
+ if (!changed) {
+ debug(`Skip linting ${absoluteFilepath}. File hasn't changed.`);
+ }
+ // Mutate file descriptor object and store config hash to each file.
+ // Running lint with different config should invalidate the cache.
+ if (meta.hashOfConfig !== this._hashOfConfig) {
+ meta.hashOfConfig = this._hashOfConfig;
+ }
+ return changed;
+};
+
+FileCache.prototype.reconcile = function() {
+ this._fileCache.reconcile();
+};
+
+FileCache.prototype.destroy = function() {
+ this._fileCache.destroy();
+};
+
+FileCache.prototype.removeEntry = function(absoluteFilepath) {
+ this._fileCache.removeEntry(absoluteFilepath);
+};
+
+module.exports = FileCache;