Additional tools for gardening.

tools/gardening_tools/multitest/lib/src/multitest.dart

Index: tools/gardening_tools/multitest/lib/src/multitest.dart
diff --git a/tools/gardening_tools/multitest/lib/src/multitest.dart b/tools/gardening_tools/multitest/lib/src/multitest.dart
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+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// 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.
+
+library multitest;
+
+import "dart:io";
+import "package:path/path.dart" as path;
+import 'package:base_lib/base_lib.dart';
+import "utils.dart";
+
+// import "test_suite.dart";
+
+// Multitests are Dart test scripts containing lines of the form
+// " [some dart code] //# [key]: [error type]"
+//
+// To support legacy multi tests we also handle lines of the form
+// " [some dart code] /// [key]: [error type]"
+//
+// For each key in the file, a new test file is made containing all
+// the normal lines of the file, and all of the multitest lines containing
+// that key, in the same order as in the source file.  The new test is expected
+// to pass if the error type listed is 'ok', or to fail if there is an error
+// type of type 'compile-time error', 'runtime error', 'static type warning', or
+// 'dynamic type error'.  The type error tests fail only in checked mode.
+// There is also a test created from only the untagged lines of the file,
+// with key "none", which is expected to pass.  This library extracts these
+// tests, writes them into a temporary directory, and passes them to the test
+// runner.  These tests may be referred to in the status files with the
+// pattern [test name]/[key].
+//
+// For example: file I_am_a_multitest.dart
+//   aaa
+//   bbb //# 02: runtime error
+//   ccc //# 02: continued
+//   ddd //# 07: static type warning
+//   eee //# 10: ok
+//   fff
+//
+// should create four tests:
+// I_am_a_multitest_none.dart
+//   aaa
+//   fff
+//
+// I_am_a_multitest_02.dart
+//   aaa
+//   bbb //# 02: runtime error
+//   ccc //# 02: continued
+//   fff
+//
+// I_am_a_multitest_07.dart
+//   aaa
+//   ddd //# 07: static type warning
+//   fff
+//
+// and I_am_a_multitest_10.dart
+//   aaa
+//   eee //# 10: ok
+//   fff
+//
+// Note that it is possible to indicate more than one acceptable outcome
+// in the case of dynamic and static type warnings
+//   aaa
+//   ddd //# 07: static type warning, dynamic type error
+//   fff
+
+/// Until legacy multitests are ported we need to support both /// and //#
+final _multitestMarker = new RegExp(r"//[/#]");
+
+class ExtractMultitestResult {
+  Map<String, String> tests;
+  Map<String, Set<String>> outcomes;
+
+  ExtractMultitestResult(this.tests, this.outcomes);
+}
+
+ExtractMultitestResult ExtractTestsFromMultitest(
+    String filePath, Logger logger) {
+  // Read the entire file into a byte buffer and transform it to a
+  // String. This will treat the file as ascii but the only parts
+  // we are interested in will be ascii in any case.
+
+  Map<String, String> tests = {};
+  Map<String, Set<String>> outcomes = {};
+
+  var bytes = new File(path.absolute(filePath)).readAsBytesSync();
+  var contents = decodeUtf8(bytes);
+  var firstNewline = contents.indexOf('\n');
+  var lineSeparator =
+      (firstNewline == 0 || contents[firstNewline - 1] != '\r') ? '\n' : '\r\n';
+  var lines = contents.split(lineSeparator);
+  if (lines.last == '') lines.removeLast();
+  bytes = null;
+  contents = null;
+  var validMultitestOutcomes = [
+    'ok',
+    'compile-time error',
+    'runtime error',
+    'static type warning',
+    'dynamic type error',
+    'checked mode compile-time error'
+  ].toSet();
+
+  // Create the set of multitests, which will have a new test added each
+  // time we see a multitest line with a new key.
+  var testsAsLines = <String, List<String>>{};
+
+  // Add the default case with key "none".
+  testsAsLines['none'] = <String>[];
+  outcomes['none'] = new Set<String>();
+
+  var lineCount = 0;
+  for (var line in lines) {
+    lineCount++;
+    var annotation = new _Annotation.from(line);
+    if (annotation != null) {
+      testsAsLines.putIfAbsent(
+          annotation.key, () => new List<String>.from(testsAsLines["none"]));
+      // Add line to test with annotation.key as key, empty line to the rest.
+      for (var key in testsAsLines.keys) {
+        testsAsLines[key].add(annotation.key == key ? line : "");
+      }
+      outcomes.putIfAbsent(annotation.key, () => new Set<String>());
+      if (annotation.rest != 'continued') {
+        for (String nextOutcome in annotation.outcomesList) {
+          if (validMultitestOutcomes.contains(nextOutcome)) {
+            outcomes[annotation.key].add(nextOutcome);
+          } else {
+            logger.warning(
+                "Warning: Invalid test directive '$nextOutcome' on line "
+                "${lineCount}:\n${annotation.rest} ");
+          }
+        }
+      }
+    } else {
+      for (var test in testsAsLines.values) test.add(line);
+    }
+  }
+  // End marker, has a final line separator so we don't need to add it after
+  // joining the lines.
+  var marker =
+      '// Test created from multitest named ${path.absolute(filePath)}.'
+      '$lineSeparator';
+  for (var test in testsAsLines.values) test.add(marker);
+
+  var keysToDelete = <String>[];
+  // Check that every key (other than the none case) has at least one outcome
+  for (var outcomeKey in outcomes.keys) {
+    if (outcomeKey != 'none' && outcomes[outcomeKey].isEmpty) {
+      logger.warning(
+          "Warning: Test ${outcomeKey} has no valid annotated outcomes.\n"
+          "Expected one of: ${validMultitestOutcomes.toString()}");
+      // If this multitest doesn't have an outcome, mark the multitest for
+      // deletion.
+      keysToDelete.add(outcomeKey);
+    }
+  }
+  // If a key/multitest was marked for deletion, do the necessary cleanup.
+  keysToDelete.forEach(outcomes.remove);
+  keysToDelete.forEach(testsAsLines.remove);
+
+  // Copy all the tests into the output map tests, as multiline strings.
+  for (var key in testsAsLines.keys) {
+    tests[key] = testsAsLines[key].join(lineSeparator);
+  }
+
+  return new ExtractMultitestResult(tests, outcomes);
+}
+
+// Represents a mutlitest annotation in the special //# comment.
+class _Annotation {
+  String key;
+  String rest;
+  List<String> outcomesList;
+  _Annotation() {}
+  factory _Annotation.from(String line) {
+    // Do an early return with "null" if this is not a valid multitest
+    // annotation.
+    if (!line.contains(_multitestMarker)) {
+      return null;
+    }
+    var parts = line
+        .split(_multitestMarker)[1]
+        .split(':')
+        .map((s) => s.trim())
+        .where((s) => s.length > 0)
+        .toList();
+    if (parts.length <= 1) {
+      return null;
+    }
+
+    var annotation = new _Annotation();
+    annotation.key = parts[0];
+    annotation.rest = parts[1];
+    annotation.outcomesList =
+        annotation.rest.split(',').map((s) => s.trim()).toList();
+    return annotation;
+  }
+}
+
+// // Find all relative imports and copy them into the dir that contains
+// // the generated tests.
+// Set<String> _findAllRelativeImports(String topLibrary) {
+//   var toSearch = [topLibrary].toSet();
+//   var foundImports = new Set<String>();
+//   var libraryDir = topLibrary.directoryPath;
+//   var relativeImportRegExp = new RegExp(
+//       '^(?:@.*\\s+)?' // Allow for a meta-data annotation.
+//       '(import|part)'
+//       '\\s+["\']'
+//       '(?!(dart:|dart-ext:|data:|package:|/))' // Look-ahead: not in package.
+//       '([^"\']*)' // The path to the imported file.
+//       '["\']');
+//   while (!toSearch.isEmpty) {
+//     var thisPass = toSearch;
+//     toSearch = new Set<String>();
+//     for (String filename in thisPass) {
+//       File f = new File(path.absolute(filename));
+//       for (String line in f.readAsLinesSync()) {
+//         Match match = relativeImportRegExp.firstMatch(line);
+//         if (match != null) {
+//           Path relativePath = new Path(match.group(3));
+//           if (foundImports.contains(relativePath.toString())) {
+//             continue;
+//           }
+//           if (relativePath.toString().contains('..')) {
+//             // This is just for safety reasons, we don't want
+//             // to unintentionally clobber files relative to the destination
+//             // dir when copying them ove.
+//             print("relative paths containing .. are not allowed.");
+//             exit(1);
+//           }
+//           foundImports.add(relativePath.toString());
+//           toSearch.add(libraryDir.join(relativePath));
+//         }
+//       }
+//     }
+//   }
+//   return foundImports;
+// }
+
+// Future doMultitest(Path filePath, String outputDir, Path suiteDir,
+//     CreateTest doTest, bool hotReload) {
+//   void writeFile(String filepath, String content) {
+//     final File file = new File(filepath);
+
+//     if (file.existsSync()) {
+//       var oldContent = file.readAsStringSync();
+//       if (oldContent == content) {
+//         // Don't write to the file if the content is the same
+//         return;
+//       }
+//     }
+//     file.writeAsStringSync(content);
+//   }
+
+//   // Each new test is a single String value in the Map tests.
+//   Map<String, String> tests = new Map<String, String>();
+//   Map<String, Set<String>> outcomes = new Map<String, Set<String>>();
+//   ExtractTestsFromMultitest(filePath, tests, outcomes);
+
+//   Path sourceDir = filePath.directoryPath;
+//   Path targetDir = createMultitestDirectory(outputDir, suiteDir, sourceDir);
+//   assert(targetDir != null);
+
+//   // Copy all the relative imports of the multitest.
+//   Set<String> importsToCopy = _findAllRelativeImports(filePath);
+//   List<Future> futureCopies = [];
+//   for (String relativeImport in importsToCopy) {
+//     Path importPath = new Path(relativeImport);
+//     // Make sure the target directory exists.
+//     Path importDir = importPath.directoryPath;
+//     if (!importDir.isEmpty) {
+//       TestUtils.mkdirRecursive(targetDir, importDir);
+//     }
+//     // Copy file.
+//     futureCopies.add(TestUtils.copyFile(
+//         sourceDir.join(importPath), targetDir.join(importPath)));
+//   }
+
+//   // Wait until all imports are copied before scheduling test cases.
+//   return Future.wait(futureCopies).then((_) {
+//     String baseFilename = filePath.filenameWithoutExtension;
+//     for (String key in tests.keys) {
+//       final Path multitestFilename =
+//           targetDir.append('${baseFilename}_$key.dart');
+//       writeFile(multitestFilename.toNativePath(), tests[key]);
+//       Set<String> outcome = outcomes[key];
+//       bool hasStaticWarning = outcome.contains('static type warning');
+//       bool hasRuntimeErrors = outcome.contains('runtime error');
+//       bool hasCompileError = outcome.contains('compile-time error');
+//       bool isNegativeIfChecked = outcome.contains('dynamic type error');
+//       bool hasCompileErrorIfChecked =
+//           outcome.contains('checked mode compile-time error');
+//       if (hotReload) {
+//         if (hasCompileError || hasCompileErrorIfChecked) {
+//           // Running a test that expects a compilation error with hot reloading
+//           // is redundant with a regular run of the test.
+//           continue;
+//         }
+//       }
+//       doTest(multitestFilename, filePath, hasCompileError, hasRuntimeErrors,
+//           isNegativeIfChecked: isNegativeIfChecked,
+//           hasCompileErrorIfChecked: hasCompileErrorIfChecked,
+//           hasStaticWarning: hasStaticWarning,
+//           multitestKey: key);
+//     }
+
+//     return null;
+//   });
+// }
+
+// String suiteNameFromPath(Path suiteDir) {
+//   var split = suiteDir.segments();
+//   // co19 test suite is at tests/co19/src.
+//   if (split.last == 'src') {
+//     split.removeLast();
+//   }
+//   return split.last;
+// }
+
+// Path createMultitestDirectory(String outputDir, Path suiteDir, Path sourceDir) {
+//   Path relative = sourceDir.relativeTo(suiteDir);
+//   Path path = new Path(outputDir)
+//       .append('generated_tests')
+//       .append(suiteNameFromPath(suiteDir))
+//       .join(relative);
+//   TestUtils.mkdirRecursive(TestUtils.currentWorkingDirectory, path);
+//   return new Path(new File(path.toNativePath()).absolute.path);
+// }