Initial GUI for VM service

runtime/bin/vmservice/client/packages/observatory/src/observatory/location_manager.dart

Index: runtime/bin/vmservice/client/packages/observatory/src/observatory/location_manager.dart
diff --git a/runtime/bin/vmservice/client/packages/observatory/src/observatory/location_manager.dart b/runtime/bin/vmservice/client/packages/observatory/src/observatory/location_manager.dart
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+++ b/runtime/bin/vmservice/client/packages/observatory/src/observatory/location_manager.dart
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+// Copyright (c) 2013, 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.
+
+part of observatory;
+
+/// The LocationManager class observes and parses the hash ('#') portion of the
+/// URL in window.location. The text after the '#' is used as the request
+/// string for the VM service.
+class LocationManager extends Object with ChangeNotifierMixin {
+  static const int InvalidIsolateId = 0;
+  static const String defaultHash = '#/isolates/';
+  static final RegExp currentIsolateMatcher = new RegExp(r"#/isolates/\d+/");
+
+  ObservatoryApplication _application;
+  ObservatoryApplication get application => _application;
+
+  @observable String get currentHash => __$currentHash; String __$currentHash = ''; set currentHash(String value) { __$currentHash = notifyPropertyChange(#currentHash, __$currentHash, value); }
+
+  void init() {
+    window.onHashChange.listen((event) {
+      if (setDefaultHash()) {
+        // We just triggered another onHashChange event.
+        return;
+      }
+      // Request the current anchor.
+      requestCurrentHash();
+    });
+
+    if (!setDefaultHash()) {
+      // An anchor was already present, trigger a request.
+      requestCurrentHash();
+    }
+  }
+
+  /// Returns the current isolate prefix, i.e. '#/isolates/XX/' if one
+  /// is present and null otherwise.
+  String currentIsolateAnchorPrefix() {
+    Match m = currentIsolateMatcher.matchAsPrefix(currentHash);
+    if (m == null) {
+      return null;
+    }
+    return m.input.substring(m.start, m.end);
+  }
+
+  /// Predicate, does the current URL have a current isolate ID in it?
+  bool get hasCurrentIsolate {
+    return currentIsolateAnchorPrefix() != null;
+  }
+
+  /// Extract the current isolate id as an integer. Returns [InvalidIsolateId]
+  /// if none is present in window.location.
+  int currentIsolateId() {
+    String isolatePrefix = currentIsolateAnchorPrefix();
+    if (isolatePrefix == null) {
+      return InvalidIsolateId;
+    }
+    String id = isolatePrefix.split("/")[2];
+    return int.parse(id);
+  }
+
+  /// If no anchor is set, set the default anchor and return true.
+  /// Return false otherwise.
+  bool setDefaultHash() {
+    currentHash = window.location.hash;
+    if (currentHash == '' || currentHash == '#') {
+      window.location.hash = defaultHash;
+      return true;
+    }
+    return false;
+  }
+
+  /// Take the current request string from window.location and submit the
+  /// request to the request manager.
+  void requestCurrentHash() {
+    currentHash = window.location.hash;
+    // Chomp off the #
+    String requestUrl = currentHash.substring(1);
+    application.requestManager.get(requestUrl);
+  }
+
+  /// Create a request for [l] on the current isolate.
+  String currentIsolateRelativeLink(String l) {
+    var isolateId = currentIsolateId();
+    if (isolateId == LocationManager.InvalidIsolateId) {
+      return defaultHash;
+    }
+    return relativeLink(isolateId, l);
+  }
+
+  /// Create a request for [objectId] on the current isolate.
+  String currentIsolateObjectLink(int objectId) {
+    var isolateId = currentIsolateId();
+    if (isolateId == LocationManager.InvalidIsolateId) {
+      return defaultHash;
+    }
+    return objectLink(isolateId, objectId);
+  }
+
+  /// Create a request for [cid] on the current isolate.
+  String currentIsolateClassLink(int cid) {
+    var isolateId = currentIsolateId();
+    if (isolateId == LocationManager.InvalidIsolateId) {
+      return defaultHash;
+    }
+    return classLink(isolateId, cid);
+  }
+
+  /// Create a request for [l] on [isolateId].
+  String relativeLink(int isolateId, String l) {
+    return '#/isolates/$isolateId/$l';
+  }
+
+  /// Create a request for [objectId] on [isolateId].
+  String objectLink(int isolateId, int objectId) {
+    return '#/isolates/$isolateId/objects/$objectId';
+  }
+
+  /// Create a request for [cid] on [isolateId].
+  String classLink(int isolateId, int cid) {
+    return '#/isolates/$isolateId/classes/$cid';
+  }
+}