Enable co19 test suite on dart test scripts.

tools/testing/dart/status_file_parser.dart

Index: tools/testing/dart/status_file_parser.dart
diff --git a/tools/testing/dart/status_file_parser.dart b/tools/testing/dart/status_file_parser.dart
index 5f6d8bbd7cac34271179f35500f96cf7ce328fd8..bd8e9f7287559ed5001cb15f78fc1c351bf4d185 100644
--- a/tools/testing/dart/status_file_parser.dart
+++ b/tools/testing/dart/status_file_parser.dart
@@ -42,19 +42,19 @@ String getFilename(String path) =>
 String getDirname(String path) =>
     new Directory(path).existsSync() ? path : '../$path';
  
-TestExpectationsMap ReadTestExpectations(String statusFilePath, environment) {
+void ReadTestExpectationsInto(TestExpectations expectations,
+                              String statusFilePath,
+                              environment) {
   List<Section> sections = new List<Section>();
   ReadConfigurationInto(statusFilePath, sections);
 
-  TestExpectationsMap map = new TestExpectationsMap();
   for (Section section in sections) {
     if (section.isEnabled(environment)) {
       for (var rule in section.testRules) {
-        map.addTest(rule, environment);
+        expectations.addRule(rule, environment);
       }
     }
   }
-  return map;
 }
 
 void ReadConfigurationInto(path, sections) {
@@ -72,7 +72,7 @@ void ReadConfigurationInto(path, sections) {
     Match match = StripComment.firstMatch(line);
     line = (match == null) ? "" : match[0];
     line = line.trim();
-    if (line == "") continue;
+    if (line.isEmpty()) continue;
 
     match = HeaderPattern.firstMatch(line);
     if (match != null) {
@@ -117,17 +117,126 @@ class TestRule {
 }
 
 
-class TestExpectationsMap {
-  Map<String, Set<String>> map;
+class TestExpectations {
+  bool _complexMatching;
+  Map _map;
+  bool _preprocessed = false;
+  Map _regExpCache;
+  Map _keyToRegExps;
+
+  /**
+   * Create a TestExpectations object. Optionally specify
+   * complexMatching behavior. See the [expectations] method
+   * for an explanation of matching.
+   */
+  TestExpectations([bool complexMatching = false])
+      : _complexMatching = complexMatching,
+        _map = new Map();
+
+  /**
+   * Add a rule to the expectations.
+   */
+  void addRule(testRule, environment) {
+    // Once we have started using the expectations we cannot add more
+    // rules.
+    if (_preprocessed) {
+      throw "TestExpectations.addRule: cannot add more rules";
+    }
+    var values = testRule.expression.evaluate(environment);
+    _map.putIfAbsent(testRule.name, () => new Set()).addAll(values);
+  }
+
+  /**
+   * Compute the expectations for a test based on the filename.
+   *
+   * For every (key, expectation) pair. Match the key with the file
+   * name. Return the union of the expectations for all the keys
+   * that match.
+   *
+   * Normal matching splits the key and the filename into path
+   * components and checks that the anchored regular expression
+   * "^$keyComponent\$" matches the corresponding filename component.
+   *
+   * If Complex matching is required the last filename component is
+   * translated into multiple components. If the last filename
+   * component starts with the second-to-last filename component that
+   * part is removed from the last filename component. Then the last
+   * component is split into more components at '_'s.
+   *
+   * Examples of complext filename component splits:
+   *
+   * a/b/c/d_e_f/d_e_f_A01_t01 -> ['a', 'b', 'c', 'd_e_f', 'A01', 't01']
+   * a/b/c/d_e_f_A01_t01 -> ['a', 'b', 'c', 'd', 'e', 'f', 'A01', 't01']
+   */
+  Set<String> expectations(String filename) {
+    var result = new Set();
+    var splitFilename = filename.split(new Platform().pathSeparator());
+
+    // If complex matching is required split the last filename
+    // component at '_'. Additionally, remove the prefix of the last
+    // component if it is identical to the second-to-last component.
+    if (_complexMatching && splitFilename.length >= 2) {
+      var last = splitFilename.removeLast();
+      var secondToLast = splitFilename.last();
+      if (last.startsWith(secondToLast)) {
+        last = last.substring(secondToLast.length);
+      }
+      last.split('_').forEach((component) {
+        if (!component.isEmpty()) {
+          splitFilename.add(component);
+        }
+      });
+    }
 
-  TestExpectationsMap() : map = new Map<String, Set<String>>();
+    // Create mapping from keys to list of RegExps once and for all.
+    _preprocessForMatching();
 
-  void addTest(testRule, environment) {
-    map[testRule.name] = testRule.expression.evaluate(environment);
+    _map.forEach((key, expectation) {
+      List regExps = _keyToRegExps[key];
+      if (regExps.length > splitFilename.length) return;
+      for (var i = 0; i < regExps.length; i++) {
+        if (!regExps[i].hasMatch(splitFilename[i])) return;
+      }
+      // If all components of the status file key matches the filename
+      // add the expectations to the result.
+      result.addAll(expectation);
+    });
+
+    // If no expectations were found the expectation is that the test
+    // passes.
+    if (result.isEmpty()) {
+      result.add(PASS);
+    }
+    return result;
   }
 
-  Set<String> expectations(String filename) {
-    var result = map[filename];
-    return result != null ? result : new Set.from([PASS]);
+  // Preprocess the expectations for matching against
+  // filenames. Generate lists of regular expressions once and for all
+  // for each key.
+  void _preprocessForMatching() {
+    if (_preprocessed) return;
+
+    _keyToRegExps = new Map();
+    _regExpCache = new Map();
+
+    _map.forEach((key, expectations) {
+      if (_keyToRegExps[key] != null) return;
+      var splitKey = key.split('/');
+      var regExps = new List(splitKey.length);
+      for (var i = 0; i < splitKey.length; i++) {
+        var component = splitKey[i];
+        var regExp = _regExpCache[component];
+        if (regExp == null) {
+          var pattern = "^${splitKey[i]}\$".replaceAll('*', '.*');
+          regExp = new RegExp(pattern);
+          _regExpCache[component] = regExp;
+        }
+        regExps[i] = regExp;
+      }
+      _keyToRegExps[key] = regExps;
+    });
+
+    _regExpCache = null;
+    _preprocessed = true;
   }
 }