Simplify test_suite.dart.

tools/testing/dart/utils.dart

Index: tools/testing/dart/utils.dart
diff --git a/tools/testing/dart/utils.dart b/tools/testing/dart/utils.dart
index f1abfaebcee77af0a9fdff2de10be1487432f240..97081135de152775035d4d6ebfbc3f720c95bea3 100644
--- a/tools/testing/dart/utils.dart
+++ b/tools/testing/dart/utils.dart
@@ -2,9 +2,12 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import 'dart:async';
 import 'dart:io';
 import 'dart:convert';
+import 'dart:math' as math;
 
+import 'configuration.dart';
 import 'path.dart';
 
 // This is the maximum time we expect stdout/stderr of subprocesses to deliver
@@ -255,3 +258,272 @@ class UniqueObject {
 
   UniqueObject() : _hashCode = ++_nextId;
 }
+
+class LastModifiedCache {
+  Map<String, DateTime> _cache = <String, DateTime>{};
+
+  /**
+   * Returns the last modified date of the given [uri].
+   *
+   * The return value will be cached for future queries. If [uri] is a local
+   * file, it's last modified [Date] will be returned. If the file does not
+   * exist, null will be returned instead.
+   * In case [uri] is not a local file, this method will always return
+   * the current date.
+   */
+  DateTime getLastModified(Uri uri) {
+    if (uri.scheme == "file") {
+      if (_cache.containsKey(uri.path)) {
+        return _cache[uri.path];
+      }
+      var file = new File(new Path(uri.path).toNativePath());
+      _cache[uri.path] = file.existsSync() ? file.lastModifiedSync() : null;
+      return _cache[uri.path];
+    }
+    return new DateTime.now();
+  }
+}
+
+class ExistsCache {
+  Map<String, bool> _cache = <String, bool>{};
+
+  /**
+   * Returns true if the file in [path] exists, false otherwise.
+   *
+   * The information will be cached.
+   */
+  bool doesFileExist(String path) {
+    if (!_cache.containsKey(path)) {
+      _cache[path] = new File(path).existsSync();
+    }
+    return _cache[path];
+  }
+}
+
+class TestUtils {
+  /**
+   * Any script using TestUtils must set dartDirUri to a file:// URI
+   * pointing to the root of the Dart checkout.
+   */
+  static void setDartDirUri(Uri uri) {
+    dartDirUri = uri;
+    dartDir = new Path(uri.toFilePath());
+  }
+
+  static math.Random rand = new math.Random.secure();
+  static Uri dartDirUri;
+  static Path dartDir;
+  static LastModifiedCache lastModifiedCache = new LastModifiedCache();
+  static ExistsCache existsCache = new ExistsCache();
+  static Path currentWorkingDirectory = new Path(Directory.current.path);
+
+  /**
+   * Generates a random number.
+   */
+  static int getRandomNumber() {
+    return rand.nextInt(0xffffffff);
+  }
+
+  /**
+   * Creates a directory using a [relativePath] to an existing
+   * [base] directory if that [relativePath] does not already exist.
+   */
+  static Directory mkdirRecursive(Path base, Path relativePath) {
+    if (relativePath.isAbsolute) {
+      base = new Path('/');
+    }
+    Directory dir = new Directory(base.toNativePath());
+    assert(dir.existsSync());
+    var segments = relativePath.segments();
+    for (String segment in segments) {
+      base = base.append(segment);
+      if (base.toString() == "/$segment" &&
+          segment.length == 2 &&
+          segment.endsWith(':')) {
+        // Skip the directory creation for a path like "/E:".
+        continue;
+      }
+      dir = new Directory(base.toNativePath());
+      if (!dir.existsSync()) {
+        dir.createSync();
+      }
+      assert(dir.existsSync());
+    }
+    return dir;
+  }
+
+  /**
+   * Copy a [source] file to a new place.
+   * Assumes that the directory for [dest] already exists.
+   */
+  static Future copyFile(Path source, Path dest) {
+    return new File(source.toNativePath())
+        .openRead()
+        .pipe(new File(dest.toNativePath()).openWrite());
+  }
+
+  static Future copyDirectory(String source, String dest) {
+    source = new Path(source).toNativePath();
+    dest = new Path(dest).toNativePath();
+
+    var executable = 'cp';
+    var args = ['-Rp', source, dest];
+    if (Platform.operatingSystem == 'windows') {
+      executable = 'xcopy';
+      args = [source, dest, '/e', '/i'];
+    }
+    return Process.run(executable, args).then((ProcessResult result) {
+      if (result.exitCode != 0) {
+        throw new Exception("Failed to execute '$executable "
+            "${args.join(' ')}'.");
+      }
+    });
+  }
+
+  static Future deleteDirectory(String path) {
+    // We are seeing issues with long path names on windows when
+    // deleting them. Use the system tools to delete our long paths.
+    // See issue 16264.
+    if (Platform.operatingSystem == 'windows') {
+      var native_path = new Path(path).toNativePath();
+      // Running this in a shell sucks, but rmdir is not part of the standard
+      // path.
+      return Process
+          .run('rmdir', ['/s', '/q', native_path], runInShell: true)
+          .then((ProcessResult result) {
+        if (result.exitCode != 0) {
+          throw new Exception('Can\'t delete path $native_path. '
+              'This path might be too long');
+        }
+      });
+    } else {
+      var dir = new Directory(path);
+      return dir.delete(recursive: true);
+    }
+  }
+
+  static void deleteTempSnapshotDirectory(Configuration configuration) {
+    if (configuration.compiler == Compiler.appJit ||
+        configuration.compiler == Compiler.precompiler) {
+      var checked = configuration.isChecked ? '-checked' : '';
+      var strong = configuration.isStrong ? '-strong' : '';
+      var minified = configuration.isMinified ? '-minified' : '';
+      var csp = configuration.isCsp ? '-csp' : '';
+      var sdk = configuration.useSdk ? '-sdk' : '';
+      var dirName = "${configuration.compiler.name}"
+          "$checked$strong$minified$csp$sdk";
+      var generatedPath =
+          configuration.buildDirectory + "/generated_compilations/$dirName";
+      TestUtils.deleteDirectory(generatedPath);
+    }
+  }
+
+  static final debugLogFilePath = new Path(".debug.log");
+
+  /// If a flaky test did fail, infos about it (i.e. test name, stdin, stdout)
+  /// will be written to this file.
+  ///
+  /// This is useful for debugging flaky tests. When running on a buildbot, the
+  /// file can be made visible in the waterfall UI.
+  static const flakyFileName = ".flaky.log";
+
+  /// If test.py was invoked with '--write-test-outcome-log it will write
+  /// test outcomes to this file.
+  static const testOutcomeFileName = ".test-outcome.log";
+
+  static void ensureExists(String filename, Configuration configuration) {
+    if (!configuration.listTests && !existsCache.doesFileExist(filename)) {
+      throw "'$filename' does not exist";
+    }
+  }
+
+  static Path absolutePath(Path path) {
+    if (!path.isAbsolute) {
+      return currentWorkingDirectory.join(path);
+    }
+    return path;
+  }
+
+  static int shortNameCounter = 0; // Make unique short file names on Windows.
+
+  static String getShortName(String path) {
+    final PATH_REPLACEMENTS = const {
+      "pkg_polymer_e2e_test_bad_import_test": "polymer_bi",
+      "pkg_polymer_e2e_test_canonicalization_test": "polymer_c16n",
+      "pkg_polymer_e2e_test_experimental_boot_test": "polymer_boot",
+      "pkg_polymer_e2e_test_good_import_test": "polymer_gi",
+      "tests_co19_src_Language_12_Expressions_14_Function_Invocation_":
+          "co19_fn_invoke_",
+      "tests_co19_src_LayoutTests_fast_css_getComputedStyle_getComputedStyle-":
+          "co19_css_getComputedStyle_",
+      "tests_co19_src_LayoutTests_fast_dom_Document_CaretRangeFromPoint_"
+          "caretRangeFromPoint-": "co19_caretrangefrompoint_",
+      "tests_co19_src_LayoutTests_fast_dom_Document_CaretRangeFromPoint_"
+          "hittest-relative-to-viewport_": "co19_caretrange_hittest_",
+      "tests_co19_src_LayoutTests_fast_dom_HTMLLinkElement_link-onerror-"
+          "stylesheet-with-": "co19_dom_link-",
+      "tests_co19_src_LayoutTests_fast_dom_": "co19_dom",
+      "tests_co19_src_LayoutTests_fast_canvas_webgl": "co19_canvas_webgl",
+      "tests_co19_src_LibTest_core_AbstractClassInstantiationError_"
+          "AbstractClassInstantiationError_": "co19_abstract_class_",
+      "tests_co19_src_LibTest_core_IntegerDivisionByZeroException_"
+          "IntegerDivisionByZeroException_": "co19_division_by_zero",
+      "tests_co19_src_WebPlatformTest_html_dom_documents_dom-tree-accessors_":
+          "co19_dom_accessors_",
+      "tests_co19_src_WebPlatformTest_html_semantics_embedded-content_"
+          "media-elements_": "co19_media_elements",
+      "tests_co19_src_WebPlatformTest_html_semantics_": "co19_semantics_",
+      "tests_co19_src_WebPlatformTest_html-templates_additions-to-"
+          "the-steps-to-clone-a-node_": "co19_htmltemplates_clone_",
+      "tests_co19_src_WebPlatformTest_html-templates_definitions_"
+          "template-contents-owner": "co19_htmltemplates_contents",
+      "tests_co19_src_WebPlatformTest_html-templates_parsing-html-"
+          "templates_additions-to-": "co19_htmltemplates_add_",
+      "tests_co19_src_WebPlatformTest_html-templates_parsing-html-"
+          "templates_appending-to-a-template_": "co19_htmltemplates_append_",
+      "tests_co19_src_WebPlatformTest_html-templates_parsing-html-"
+          "templates_clearing-the-stack-back-to-a-given-context_":
+          "co19_htmltemplates_clearstack_",
+      "tests_co19_src_WebPlatformTest_html-templates_parsing-html-"
+          "templates_creating-an-element-for-the-token_":
+          "co19_htmltemplates_create_",
+      "tests_co19_src_WebPlatformTest_html-templates_template-element"
+          "_template-": "co19_htmltemplates_element-",
+      "tests_co19_src_WebPlatformTest_html-templates_": "co19_htmltemplate_",
+      "tests_co19_src_WebPlatformTest_shadow-dom_shadow-trees_":
+          "co19_shadow-trees_",
+      "tests_co19_src_WebPlatformTest_shadow-dom_elements-and-dom-objects_":
+          "co19_shadowdom_",
+      "tests_co19_src_WebPlatformTest_shadow-dom_html-elements-in-"
+          "shadow-trees_": "co19_shadow_html_",
+      "tests_co19_src_WebPlatformTest_html_webappapis_system-state-and-"
+          "capabilities_the-navigator-object": "co19_webappapis_navigator_",
+      "tests_co19_src_WebPlatformTest_DOMEvents_approved_": "co19_dom_approved_"
+    };
+
+    // Some tests are already in [build_dir]/generated_tests.
+    String GEN_TESTS = 'generated_tests/';
+    if (path.contains(GEN_TESTS)) {
+      int index = path.indexOf(GEN_TESTS) + GEN_TESTS.length;
+      path = 'multitest/${path.substring(index)}';
+    }
+    path = path.replaceAll('/', '_');
+    final int WINDOWS_SHORTEN_PATH_LIMIT = 58;
+    final int WINDOWS_PATH_END_LENGTH = 30;
+    if (Platform.operatingSystem == 'windows' &&
+        path.length > WINDOWS_SHORTEN_PATH_LIMIT) {
+      for (var key in PATH_REPLACEMENTS.keys) {
+        if (path.startsWith(key)) {
+          path = path.replaceFirst(key, PATH_REPLACEMENTS[key]);
+          break;
+        }
+      }
+      if (path.length > WINDOWS_SHORTEN_PATH_LIMIT) {
+        ++shortNameCounter;
+        var pathEnd = path.substring(path.length - WINDOWS_PATH_END_LENGTH);
+        path = "short${shortNameCounter}_$pathEnd";
+      }
+    }
+    return path;
+  }
+}