{"action":"created","comment":{"url":"https://api.github.com/repos/attic-labs/noms/pulls/comments/74506104","id":74506104,"diff_hunk":"@@ -4,155 +4,180 @@\n // Licensed under the Apache License, version 2.0:\n // http://www.apache.org/licenses/LICENSE-2.0\n \n+import AbsolutePath from './absolute-path.js';\n+import {notNull} from './assert.js';\n import {BatchStoreAdaptor} from './batch-store.js';\n-import Dataset from './dataset.js';\n+import Dataset, {datasetRe} from './dataset.js';\n import Database from './database.js';\n import HttpBatchStore from './http-batch-store.js';\n import MemoryStore from './memory-store.js';\n-import Hash from './hash.js';\n-\n-// A parsed specification for the location of a Noms database.\n-// For example: 'mem:' or 'https://ds.noms.io/aa/music'\n-//\n-// See \"spelling databases\" for details on supported syntaxes:\n-// https://docs.google.com/document/d/1QgKcRS304llwU0ECahKtn8lGBFmT5zXzWr-5tah1S_4/edit\n+import type Value from './value.js';\n+\n+/**\n+ * A parsed specification for the location of a Noms database.\n+ * For example: 'mem' or 'https://demo.noms.io/cli-tour'.\n+ *\n+ * See https://github.com/attic-labs/noms/blob/master/doc/spelling.md.\n+ */\n export class DatabaseSpec {\n   scheme: string;\n   path: string;\n \n-  // Returns parsed spec, or null if the spec was invalid.\n-  static parse(spec: string): ?DatabaseSpec {\n-    const match = spec.match(/^(.+?)(:.+)?$/);\n-    if (!match) {\n-      return null;\n-    }\n-    const [, scheme, p] = match;\n-    if (p && p.indexOf('::') > 0) {\n-      return null;\n+  /** Cache this for testing, or it will reset every time database() is called. */\n+  _ms: MemoryStore|null;\n+\n+  /**\n+   * Returns `spec` parsed as a DatabaseSpec. Throws a `SyntaxError` if `spec` isn't valid.\n+   */\n+  static parse(spec: string): DatabaseSpec {\n+    // A common mistake is to accidentally use the \"ldb\" protocol thinking it works,\n+    // because the Go SDK does.\n+    const ldbNotSupported = 'The \"ldb\" protocol is not supported in the JS SDK. ' +\n+      'Instead, use \"noms serve\" and point at \"http://localhost:8000\"';\n+\n+    const protoIdx = spec.indexOf(':');\n+    if (protoIdx === -1) {\n+      if (spec === 'mem') {\n+        return new DatabaseSpec('mem', '');\n+      }\n+      // In the Go SDK this would be interpreted as \"ldb\", but JS doesn't support ldb.\n+      throw new SyntaxError(ldbNotSupported);\n     }\n-    const path = p ? p.substr(1) : p;\n-    switch (scheme) {\n+\n+    const protocol = spec.slice(0, protoIdx);\n+    const path = spec.slice(protoIdx + 1);\n+\n+    switch (protocol) {\n+      case 'ldb':\n+        throw new SyntaxError(ldbNotSupported);\n+      case 'mem':\n+        throw new SyntaxError('In-memory database must be specified as \"mem\" not \"mem:');\n       case 'http':\n       case 'https':\n-        if (!path) {\n-          return null;\n-        }\n-        break;\n-      case 'mem':\n-        if (path) {\n-          return null;\n+        // TODO: better validation, see https://github.com/attic-labs/noms/issues/2351.\n+        if (path === '') {\n+          throw new SyntaxError(`Invalid URL ${spec}`);\n         }\n-        break;\n+        return new DatabaseSpec(protocol, path);\n       default:\n-        return null;\n+        throw new SyntaxError(`Unsupported protocol ${protocol}`);\n     }\n-    return new this(scheme, path || '');\n   }\n \n   constructor(scheme: string, path: string) {\n     this.scheme = scheme;\n     this.path = path;\n+    this._ms = scheme === 'mem' ? new MemoryStore() : null;\n   }\n \n-  // Constructs a new Database based on the parsed spec.\n+  /**\n+   * Constructs a new Database based on the parsed spec.\n+   */\n   database(): Database {\n-    if (this.scheme === 'mem') {\n-      return new Database(new BatchStoreAdaptor(new MemoryStore()));\n-    }\n-    if (this.scheme === 'http') {\n-      return new Database(new HttpBatchStore(`${this.scheme}:${this.path}`));\n+    switch (this.scheme) {\n+      case 'mem':\n+        return new Database(new BatchStoreAdaptor(notNull(this._ms)));\n+      case 'http':\n+      case 'https':\n+        return new Database(new HttpBatchStore(`${this.scheme}:${this.path}`));\n+      default:\n+        throw new Error('Unreached');\n     }\n-    throw new Error('Unreached');\n   }\n }\n \n-// A parsed specification for the location of a Noms dataset.\n-// For example: 'mem:photos' or 'https://ds.noms.io/aa/music:funk'\n-//\n-// See \"spelling datasets\" for details on supported syntaxes:\n-// https://docs.google.com/document/d/1QgKcRS304llwU0ECahKtn8lGBFmT5zXzWr-5tah1S_4/edit\n+/**\n+ * A parsed specification for the location of a Noms dataset.\n+ * For example: 'mem::photos' or 'https://demo.noms.io/cli-tour::sf-crime'.\n+ *\n+ * See https://github.com/attic-labs/noms/blob/master/doc/spelling.md.\n+ */\n export class DatasetSpec {\n   database: DatabaseSpec;\n   name: string;\n \n-  // Returns a parsed spec, or null if the spec was invalid.\n-  static parse(spec: string): ?DatasetSpec {\n-    const match = spec.match(/^(.+)\\:\\:([a-zA-Z0-9\\-_/]+)$/);\n-    if (!match) {\n-      return null;\n+  /**\n+   * Returns `spec` parsed as a DatasetSpec. Throws a `SyntaxError` if `spec` isn't valid.\n+   */\n+  static parse(spec: string): DatasetSpec {\n+    const [database, name] = splitAndParseDatabaseSpec(spec);\n+    if (!datasetRe.test(name)) {\n+      throw new SyntaxError(`Invalid dataset ${name}, must match ${datasetRe.source}`);\n     }\n-    const [, dbSpec, dsName] = match;\n-    const database = DatabaseSpec.parse(dbSpec);\n-    if (!database) {\n-      return null;\n-    }\n-    return new this(database, dsName);\n+    return new DatasetSpec(database, name);\n   }\n \n   constructor(database: DatabaseSpec, name: string) {\n     this.database = database;\n     this.name = name;\n   }\n \n-  // Returns a new DataSet based on the parsed spec.\n+  /**\n+   * Returns a new Dataset based on this DatasetSpec.\n+   */\n   dataset(): Dataset {\n     return new Dataset(this.database.database(), this.name);\n   }\n \n-  // Returns the value at the HEAD of this dataset, if any, or null otherwise.\n-  value(): Promise<any> {\n-    // Hm. Calling dataset() creates a Database that we then toss into the ether, which means we\n-    // can't call close() on it. Ideally, we'd fix that.\n-    return this.dataset().head()\n-      .then(commit => commit && commit.value);\n+  /**\n+   * Returns a tuple of the database backed by this dataset, and value at the HEAD of this\n+   * dataset. If this dataset doesn't have a HEAD, the value will be `null`.\n+   *\n+   * The caller should always call `close()` when done.\n+   */\n+  value(): Promise<[Database, Value|null]> {\n+    const db = this.database.database();\n+    return this.dataset().head().then(commit => {\n+      if (commit === null || commit === undefined) 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