1 files changed, 365 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/node_modules/v8-compile-cache/v8-compile-cache.js b/tools/node_modules/eslint/node_modules/v8-compile-cache/v8-compile-cache.js
new file mode 100644
index 0000000000..e7a226b8a9
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/v8-compile-cache/v8-compile-cache.js
@@ -0,0 +1,365 @@
+'use strict';
+
+const Module = require('module');
+const crypto = require('crypto');
+const fs = require('fs');
+const path = require('path');
+const vm = require('vm');
+const os = require('os');
+
+const hasOwnProperty = Object.prototype.hasOwnProperty;
+
+//------------------------------------------------------------------------------
+// FileSystemBlobStore
+//------------------------------------------------------------------------------
+
+class FileSystemBlobStore {
+  constructor(directory, prefix) {
+    const name = prefix ? slashEscape(prefix + '.') : '';
+    this._blobFilename = path.join(directory, name + 'BLOB');
+    this._mapFilename = path.join(directory, name + 'MAP');
+    this._lockFilename = path.join(directory, name + 'LOCK');
+    this._directory = directory;
+    this._load();
+  }
+
+  has(key, invalidationKey) {
+    if (hasOwnProperty.call(this._memoryBlobs, key)) {
+      return this._invalidationKeys[key] === invalidationKey;
+    } else if (hasOwnProperty.call(this._storedMap, key)) {
+      return this._storedMap[key][0] === invalidationKey;
+    }
+    return false;
+  }
+
+  get(key, invalidationKey) {
+    if (hasOwnProperty.call(this._memoryBlobs, key)) {
+      if (this._invalidationKeys[key] === invalidationKey) {
+        return this._memoryBlobs[key];
+      }
+    } else if (hasOwnProperty.call(this._storedMap, key)) {
+      const mapping = this._storedMap[key];
+      if (mapping[0] === invalidationKey) {
+        return this._storedBlob.slice(mapping[1], mapping[2]);
+      }
+    }
+  }
+
+  set(key, invalidationKey, buffer) {
+    this._invalidationKeys[key] = invalidationKey;
+    this._memoryBlobs[key] = buffer;
+    this._dirty = true;
+  }
+
+  delete(key) {
+    if (hasOwnProperty.call(this._memoryBlobs, key)) {
+      this._dirty = true;
+      delete this._memoryBlobs[key];
+    }
+    if (hasOwnProperty.call(this._invalidationKeys, key)) {
+      this._dirty = true;
+      delete this._invalidationKeys[key];
+    }
+    if (hasOwnProperty.call(this._storedMap, key)) {
+      this._dirty = true;
+      delete this._storedMap[key];
+    }
+  }
+
+  isDirty() {
+    return this._dirty;
+  }
+
+  save() {
+    const dump = this._getDump();
+    const blobToStore = Buffer.concat(dump[0]);
+    const mapToStore = JSON.stringify(dump[1]);
+
+    try {
+      mkdirpSync(this._directory);
+      fs.writeFileSync(this._lockFilename, 'LOCK', {flag: 'wx'});
+    } catch (error) {
+      // Swallow the exception if we fail to acquire the lock.
+      return false;
+    }
+
+    try {
+      fs.writeFileSync(this._blobFilename, blobToStore);
+      fs.writeFileSync(this._mapFilename, mapToStore);
+    } catch (error) {
+      throw error;
+    } finally {
+      fs.unlinkSync(this._lockFilename);
+    }
+
+    return true;
+  }
+
+  _load() {
+    try {
+      this._storedBlob = fs.readFileSync(this._blobFilename);
+      this._storedMap = JSON.parse(fs.readFileSync(this._mapFilename));
+    } catch (e) {
+      this._storedBlob = Buffer.alloc(0);
+      this._storedMap = {};
+    }
+    this._dirty = false;
+    this._memoryBlobs = {};
+    this._invalidationKeys = {};
+  }
+
+  _getDump() {
+    const buffers = [];
+    const newMap = {};
+    let offset = 0;
+
+    function push(key, invalidationKey, buffer) {
+      buffers.push(buffer);
+      newMap[key] = [invalidationKey, offset, offset + buffer.length];
+      offset += buffer.length;
+    }
+
+    for (const key of Object.keys(this._memoryBlobs)) {
+      const buffer = this._memoryBlobs[key];
+      const invalidationKey = this._invalidationKeys[key];
+      push(key, invalidationKey, buffer);
+    }
+
+    for (const key of Object.keys(this._storedMap)) {
+      if (hasOwnProperty.call(newMap, key)) continue;
+      const mapping = this._storedMap[key];
+      const buffer = this._storedBlob.slice(mapping[1], mapping[2]);
+      push(key, mapping[0], buffer);
+    }
+
+    return [buffers, newMap];
+  }
+}
+
+//------------------------------------------------------------------------------
+// NativeCompileCache
+//------------------------------------------------------------------------------
+
+class NativeCompileCache {
+  constructor() {
+    this._cacheStore = null;
+    this._previousModuleCompile = null;
+  }
+
+  setCacheStore(cacheStore) {
+    this._cacheStore = cacheStore;
+  }
+
+  install() {
+    const self = this;
+    const hasRequireResolvePaths = typeof require.resolve.paths === 'function';
+    this._previousModuleCompile = Module.prototype._compile;
+    Module.prototype._compile = function(content, filename) {
+      const mod = this;
+
+      function require(id) {
+        return mod.require(id);
+      }
+
+      // https://github.com/nodejs/node/blob/v10.15.3/lib/internal/modules/cjs/helpers.js#L28
+      function resolve(request, options) {
+        return Module._resolveFilename(request, mod, false, options);
+      }
+      require.resolve = resolve;
+
+      // https://github.com/nodejs/node/blob/v10.15.3/lib/internal/modules/cjs/helpers.js#L37
+      // resolve.resolve.paths was added in v8.9.0
+      if (hasRequireResolvePaths) {
+        resolve.paths = function paths(request) {
+          return Module._resolveLookupPaths(request, mod, true);
+        };
+      }
+
+      require.main = process.mainModule;
+
+      // Enable support to add extra extension types
+      require.extensions = Module._extensions;
+      require.cache = Module._cache;
+
+      const dirname = path.dirname(filename);
+
+      const compiledWrapper = self._moduleCompile(filename, content);
+
+      // We skip the debugger setup because by the time we run, node has already
+      // done that itself.
+
+      const args = [mod.exports, require, mod, filename, dirname, process, global];
+      return compiledWrapper.apply(mod.exports, args);
+    };
+  }
+
+  uninstall() {
+    Module.prototype._compile = this._previousModuleCompile;
+  }
+
+  _moduleCompile(filename, content) {
+    // https://github.com/nodejs/node/blob/v7.5.0/lib/module.js#L511
+
+    // Remove shebang
+    var contLen = content.length;
+    if (contLen >= 2) {
+      if (content.charCodeAt(0) === 35/*#*/ &&
+          content.charCodeAt(1) === 33/*!*/) {
+        if (contLen === 2) {
+          // Exact match
+          content = '';
+        } else {
+          // Find end of shebang line and slice it off
+          var i = 2;
+          for (; i < contLen; ++i) {
+            var code = content.charCodeAt(i);
+            if (code === 10/*\n*/ || code === 13/*\r*/) break;
+          }
+          if (i === contLen) {
+            content = '';
+          } else {
+            // Note that this actually includes the newline character(s) in the
+            // new output. This duplicates the behavior of the regular
+            // expression that was previously used to replace the shebang line
+            content = content.slice(i);
+          }
+        }
+      }
+    }
+
+    // create wrapper function
+    var wrapper = Module.wrap(content);
+
+    var invalidationKey = crypto
+      .createHash('sha1')
+      .update(content, 'utf8')
+      .digest('hex');
+
+    var buffer = this._cacheStore.get(filename, invalidationKey);
+
+    var script = new vm.Script(wrapper, {
+      filename: filename,
+      lineOffset: 0,
+      displayErrors: true,
+      cachedData: buffer,
+      produceCachedData: true,
+    });
+
+    if (script.cachedDataProduced) {
+      this._cacheStore.set(filename, invalidationKey, script.cachedData);
+    } else if (script.cachedDataRejected) {
+      this._cacheStore.delete(filename);
+    }
+
+    var compiledWrapper = script.runInThisContext({
+      filename: filename,
+      lineOffset: 0,
+      columnOffset: 0,
+      displayErrors: true,
+    });
+
+    return compiledWrapper;
+  }
+}
+
+//------------------------------------------------------------------------------
+// utilities
+//
+// https://github.com/substack/node-mkdirp/blob/f2003bb/index.js#L55-L98
+// https://github.com/zertosh/slash-escape/blob/e7ebb99/slash-escape.js
+//------------------------------------------------------------------------------
+
+function mkdirpSync(p_) {
+  _mkdirpSync(path.resolve(p_), parseInt('0777', 8) & ~process.umask());
+}
+
+function _mkdirpSync(p, mode) {
+  try {
+    fs.mkdirSync(p, mode);
+  } catch (err0) {
+    if (err0.code === 'ENOENT') {
+      _mkdirpSync(path.dirname(p));
+      _mkdirpSync(p);
+    } else {
+      try {
+        const stat = fs.statSync(p);
+        if (!stat.isDirectory()) { throw err0; }
+      } catch (err1) {
+        throw err0;
+      }
+    }
+  }
+}
+
+function slashEscape(str) {
+  const ESCAPE_LOOKUP = {
+    '\\': 'zB',
+    ':': 'zC',
+    '/': 'zS',
+    '\x00': 'z0',
+    'z': 'zZ',
+  };
+  return str.replace(/[\\:\/\x00z]/g, match => (ESCAPE_LOOKUP[match]));
+}
+
+function supportsCachedData() {
+  const script = new vm.Script('""', {produceCachedData: true});
+  // chakracore, as of v1.7.1.0, returns `false`.
+  return script.cachedDataProduced === true;
+}
+
+function getCacheDir() {
+  // Avoid cache ownership issues on POSIX systems.
+  const dirname = typeof process.getuid === 'function'
+    ? 'v8-compile-cache-' + process.getuid()
+    : 'v8-compile-cache';
+  const version = typeof process.versions.v8 === 'string'
+    ? process.versions.v8
+    : typeof process.versions.chakracore === 'string'
+      ? 'chakracore-' + process.versions.chakracore
+      : 'node-' + process.version;
+  const cacheDir = path.join(os.tmpdir(), dirname, version);
+  return cacheDir;
+}
+
+function getParentName() {
+  // `module.parent.filename` is undefined or null when:
+  //    * node -e 'require("v8-compile-cache")'
+  //    * node -r 'v8-compile-cache'
+  //    * Or, requiring from the REPL.
+  const parentName = module.parent && typeof module.parent.filename === 'string'
+    ? module.parent.filename
+    : process.cwd();
+  return parentName;
+}
+
+//------------------------------------------------------------------------------
+// main
+//------------------------------------------------------------------------------
+
+if (!process.env.DISABLE_V8_COMPILE_CACHE && supportsCachedData()) {
+  const cacheDir = getCacheDir();
+  const prefix = getParentName();
+  const blobStore = new FileSystemBlobStore(cacheDir, prefix);
+
+  const nativeCompileCache = new NativeCompileCache();
+  nativeCompileCache.setCacheStore(blobStore);
+  nativeCompileCache.install();
+
+  process.once('exit', code => {
+    if (blobStore.isDirty()) {
+      blobStore.save();
+    }
+    nativeCompileCache.uninstall();
+  });
+}
+
+module.exports.__TEST__ = {
+  FileSystemBlobStore,
+  NativeCompileCache,
+  mkdirpSync,
+  slashEscape,
+  supportsCachedData,
+  getCacheDir,
+  getParentName,
+};