Add a debugging tool for inspecting the contents of a summary file.

pkg/analyzer/lib/src/summary/inspect.dart

Index: pkg/analyzer/lib/src/summary/inspect.dart
diff --git a/pkg/analyzer/lib/src/summary/inspect.dart b/pkg/analyzer/lib/src/summary/inspect.dart
new file mode 100644
index 0000000000000000000000000000000000000000..a70fddd23b97d918bf445a1cbf8bbaca9f702f1c
--- /dev/null
+++ b/pkg/analyzer/lib/src/summary/inspect.dart
@@ -0,0 +1,428 @@
+// Copyright (c) 2016, 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.
+
+import 'dart:convert';
+import 'dart:mirrors';
+
+import 'package:analyzer/src/generated/utilities_dart.dart';
+import 'package:analyzer/src/summary/base.dart';
+import 'package:analyzer/src/summary/idl.dart';
+
+const int MAX_LINE_LENGTH = 80;
+
+/**
+ * Cache used to speed up [isEnum].
+ */
+Map<Type, bool> _isEnumCache = <Type, bool>{};
+
+/**
+ * Determine if the given [obj] has an enumerated type.
+ */
+bool isEnum(Object obj) {
+  return _isEnumCache.putIfAbsent(
+      obj.runtimeType, () => reflect(obj).type.isEnum);
+}
+
+/**
+ * Decoded reprensentation of a part of a summary that occupies multiple lines
+ * of output.
+ */
+class BrokenEntity implements DecodedEntity {
+  final String opener;
+  final Map<String, DecodedEntity> parts;
+  final String closer;
+
+  BrokenEntity(this.opener, this.parts, this.closer);
+
+  @override
+  List<String> getLines() {
+    List<String> result = <String>[opener];
+    bool first = true;
+    for (String key in parts.keys) {
+      if (first) {
+        first = false;
+      } else {
+        result[result.length - 1] += ',';
+      }
+      List<String> subResult = parts[key].getLines();
+      subResult[0] = '$key: ${subResult[0]}';
+      result.addAll(subResult.map((String s) => '  $s'));
+    }
+    result.add(closer);
+    return result;
+  }
+}
+
+/**
+ * Decoded representation of a part of a summary.
+ */
+abstract class DecodedEntity {
+  /**
+   * Create a representation of a part of the summary that consists of a group
+   * of entities (represented by [parts]) contined between [opener] and

[scheglov, 2016/04/21 22:11:41]

contined -> contained

[Paul Berry, 2016/04/21 22:31:08]

Done.

+   * [closers].

[scheglov, 2016/04/21 22:11:41]

[closers] -> [closer]

[Paul Berry, 2016/04/21 22:31:08]

Done.

+   *
+   * If [forceKeys] is `true`, the keys in [parts] will always be shown.  If
+   * [forceKeys] is `false`, they keys will only be shown if the output is
+   * broken into multiple lines.
+   */
+  factory DecodedEntity.group(String opener, Map<String, DecodedEntity> parts,
+      String closer, bool forceKeys) {
+    // Attempt to format the entity in a single line; if not bail out and
+    // construct a _BrokenEntity.
+    DecodedEntity bailout() => new BrokenEntity(opener, parts, closer);
+    String short = opener;
+    bool first = true;
+    for (String key in parts.keys) {
+      if (first) {
+        first = false;
+      } else {
+        short += ', ';
+      }
+      DecodedEntity value = parts[key];
+      if (forceKeys) {
+        short += '$key: ';
+      }
+      if (value is UnbrokenEntity) {
+        short += value._s;
+      } else {
+        return bailout();
+      }
+      if (short.length > MAX_LINE_LENGTH) {
+        return bailout();
+      }
+    }
+    return new DecodedEntity.short(short + closer);
+  }
+
+  /**
+   * Create a representation of a part of the summary that is represented by a
+   * single unbroken string.
+   */
+  factory DecodedEntity.short(String s) = UnbrokenEntity;
+
+  /**
+   * Format this entity into a sequence of strings (one per output line).
+   */
+  List<String> getLines();
+}
+
+/**
+ * Wrapper around a [LinkedLibrary] and its constituent [UnlinkedUnit]s.
+ */
+class LibraryWrapper {
+  final LinkedLibrary _linked;
+  final List<UnlinkedUnit> _unlinked;
+
+  LibraryWrapper(this._linked, this._unlinked);
+}
+
+/**
+ * Wrapper around a [LinkedReference] and its corresponding [UnlinkedReference].
+ */
+class ReferenceWrapper {
+  final LinkedReference _linked;
+  final UnlinkedReference _unlinked;
+
+  ReferenceWrapper(this._linked, this._unlinked);
+
+  String get name {
+    if (_linked != null && _linked.name.isNotEmpty) {
+      return _linked.name;
+    } else if (_unlinked != null && _unlinked.name.isNotEmpty) {
+      return _unlinked.name;
+    } else {
+      return '???';
+    }
+  }
+}
+
+/**
+ * Instances of [SummaryInspector] are capable of traversing a summary and
+ * converting it to semi-human-readable output.
+ */
+class SummaryInspector {
+  /**
+   * The dependencies of the library currently being visited.
+   */
+  List<LinkedDependency> _dependencies;
+
+  /**
+   * The references of the unit currently being visited.
+   */
+  List<ReferenceWrapper> _references;
+
+  /**
+   * Decode the object [obj], which was reached by examining [key] inside
+   * another object.
+   */
+  DecodedEntity decode(Object obj, String key) {
+    if (obj is PackageBundle) {
+      return decodePackageBundle(obj);
+    }
+    if (obj is LibraryWrapper) {
+      return decodeLibrary(obj);
+    }
+    if (obj is UnitWrapper) {
+      return decodeUnit(obj);
+    }
+    if (obj is ReferenceWrapper) {
+      return decodeReference(obj);
+    }
+    if (obj is DecodedEntity) {
+      return obj;
+    }
+    if (obj is SummaryClass) {
+      Map<String, Object> map = obj.toMap();
+      return decodeMap(map);
+    } else if (obj is List) {
+      Map<String, DecodedEntity> parts = <String, DecodedEntity>{};
+      for (int i = 0; i < obj.length; i++) {
+        parts[i.toString()] = decode(obj[i], key);
+      }
+      return new DecodedEntity.group('[', parts, ']', false);
+    } else if (obj is String) {
+      return new DecodedEntity.short(JSON.encode(obj));
+    } else if (isEnum(obj)) {
+      return new DecodedEntity.short(obj.toString().split('.')[1]);
+    } else if (obj is int &&
+        key == 'dependency' &&
+        _dependencies != null &&
+        obj < _dependencies.length) {
+      return new DecodedEntity.short('$obj (${_dependencies[obj].uri})');
+    } else if (obj is int &&
+        key == 'reference' &&
+        _references != null &&
+        obj < _references.length) {
+      return new DecodedEntity.short('$obj (${_references[obj].name})');
+    } else {
+      return new DecodedEntity.short(obj.toString());
+    }
+  }
+
+  /**
+   * Decode the given [LibraryWrapper].
+   */
+  DecodedEntity decodeLibrary(LibraryWrapper obj) {
+    try {
+      LinkedLibrary linked = obj._linked;
+      List<UnlinkedUnit> unlinked = obj._unlinked;
+      _dependencies = linked.dependencies;
+      Map<String, Object> result = linked.toMap();
+      result.remove('units');
+      result['defining compilation unit'] =
+          new UnitWrapper(linked.units[0], unlinked[0]);
+      for (int i = 1; i < linked.units.length; i++) {
+        String partUri = unlinked[0].publicNamespace.parts[i - 1];
+        result['part ${JSON.encode(partUri)}'] =
+            new UnitWrapper(linked.units[i], unlinked[i]);
+      }
+      return decodeMap(result);
+    } finally {
+      _dependencies = null;
+    }
+  }
+
+  /**
+   * Decode the given [map].
+   */
+  DecodedEntity decodeMap(Map<String, Object> map) {
+    Map<String, DecodedEntity> parts = <String, DecodedEntity>{};
+    map = reorderMap(map);
+    map.forEach((String key, Object value) {
+      if (value is String && value.isEmpty) {
+        return;
+      }
+      if (isEnum(value) && (value as dynamic).index == 0) {
+        return;
+      }
+      if (value is int && value == 0) {
+        return;
+      }
+      if (value is bool && value == false) {
+        return;
+      }
+      if (value == null) {
+        return;
+      }
+      if (value is List) {
+        if (value.isEmpty) {
+          return;
+        }
+        DecodedEntity entity = decode(value, key);
+        if (entity is BrokenEntity) {
+          for (int i = 0; i < value.length; i++) {
+            parts['$key[$i]'] = decode(value[i], key);
+          }
+          return;
+        } else {
+          parts[key] = entity;
+        }
+      }
+      parts[key] = decode(value, key);
+    });
+    return new DecodedEntity.group('{', parts, '}', true);
+  }
+
+  /**
+   * Decode the given [PackageBundle].
+   */
+  DecodedEntity decodePackageBundle(PackageBundle bundle) {
+    Map<String, UnlinkedUnit> units = <String, UnlinkedUnit>{};
+    Set<String> seenUnits = new Set<String>();
+    for (int i = 0; i < bundle.unlinkedUnits.length; i++) {
+      units[bundle.unlinkedUnitUris[i]] = bundle.unlinkedUnits[i];
+    }
+    Map<String, Object> restOfMap = bundle.toMap();
+    Map<String, Object> result = <String, Object>{};
+    result['version'] = new DecodedEntity.short(
+        '${bundle.majorVersion}.${bundle.minorVersion}');
+    restOfMap.remove('majorVersion');
+    restOfMap.remove('minorVersion');
+    for (int i = 0; i < bundle.linkedLibraries.length; i++) {
+      String libraryUriString = bundle.linkedLibraryUris[i];
+      Uri libraryUri = Uri.parse(libraryUriString);
+      UnlinkedUnit unlinkedDefiningUnit = units[libraryUriString];
+      seenUnits.add(libraryUriString);
+      List<UnlinkedUnit> libraryUnits = <UnlinkedUnit>[unlinkedDefiningUnit];
+      LinkedLibrary linkedLibrary = bundle.linkedLibraries[i];
+      for (int j = 1; j < linkedLibrary.units.length; j++) {
+        String partUriString = resolveRelativeUri(libraryUri,
+                Uri.parse(unlinkedDefiningUnit.publicNamespace.parts[j - 1]))
+            .toString();
+        libraryUnits.add(units[partUriString]);
+        seenUnits.add(partUriString);
+      }
+      result['library ${JSON.encode(libraryUriString)}'] =
+          new LibraryWrapper(linkedLibrary, libraryUnits);
+    }
+    for (String uriString in units.keys) {
+      if (seenUnits.contains(uriString)) {
+        continue;
+      }
+      result['orphan unit ${JSON.encode(uriString)}'] =
+          new UnitWrapper(null, units[uriString]);
+    }
+    restOfMap.remove('linkedLibraries');
+    restOfMap.remove('linkedLibraryUris');
+    restOfMap.remove('unlinkedUnits');
+    restOfMap.remove('unlinkedUnitUris');
+    result.addAll(restOfMap);
+    return decodeMap(result);
+  }
+
+  /**
+   * Decode the given [ReferenceWrapper].
+   */
+  DecodedEntity decodeReference(ReferenceWrapper obj) {
+    Map<String, Object> result = obj._unlinked != null
+        ? obj._unlinked.toMap()
+        : <String, Object>{'linkedOnly': true};
+    if (obj._linked != null) {
+      mergeMaps(result, obj._linked.toMap());
+    }
+    return decodeMap(result);
+  }
+
+  /**
+   * Decode the given [UnitWrapper].
+   */
+  DecodedEntity decodeUnit(UnitWrapper obj) {
+    try {
+      LinkedUnit linked = obj._linked;
+      UnlinkedUnit unlinked = obj._unlinked;
+      Map<String, Object> unlinkedMap = unlinked.toMap();
+      Map<String, Object> linkedMap =
+          linked != null ? linked.toMap() : <String, Object>{};
+      Map<String, Object> result = <String, Object>{};
+      List<ReferenceWrapper> references = <ReferenceWrapper>[];
+      int numReferences = linked != null
+          ? linked.references.length
+          : unlinked.references.length;
+      for (int i = 0; i < numReferences; i++) {
+        references.add(new ReferenceWrapper(
+            linked != null ? linked.references[i] : null,
+            i < unlinked.references.length ? unlinked.references[i] : null));
+      }
+      result['references'] = references;
+      _references = references;
+      unlinkedMap.remove('references');
+      linkedMap.remove('references');
+      linkedMap.forEach((String key, Object value) {
+        result['linked $key'] = value;
+      });
+      unlinkedMap.forEach((String key, Object value) {
+        result[key] = value;
+      });
+      return decodeMap(result);
+    } finally {
+      _references = null;
+    }
+  }
+
+  /**
+   * Decode the given [PackageBundle] and dump it to a list of strings.
+   */
+  List<String> dumpPackageBundle(PackageBundle bundle) {
+    DecodedEntity decoded = decode(bundle, 'PackageBundle');
+    return decoded.getLines();
+  }
+
+  /**
+   * Merge the contents of [other] into [result], discarding empty entries.
+   */
+  void mergeMaps(Map<String, Object> result, Map<String, Object> other) {
+    other.forEach((String key, Object value) {
+      if (value is String && value.isEmpty) {
+        return;
+      }
+      if (result.containsKey(key)) {
+        Object oldValue = result[key];
+        if (oldValue is String && oldValue.isEmpty) {
+          result[key] = value;
+        } else {
+          throw new Exception(
+              'Duplicate values for $key: $oldValue and $value');
+        }
+      } else {
+        result[key] = value;
+      }
+    });
+  }
+
+  /**
+   * Reorder [map] for more intuitive display.
+   */
+  Map<String, Object> reorderMap(Map<String, Object> map) {
+    Map<String, Object> result = <String, Object>{};
+    if (map.containsKey('name')) {
+      result['name'] = map['name'];
+    }
+    result.addAll(map);
+    return result;
+  }
+}
+
+/**
+ * Decoded reprensentation of a part of a summary that occupies a single line of
+ * output.
+ */
+class UnbrokenEntity implements DecodedEntity {
+  final String _s;
+
+  UnbrokenEntity(this._s);
+
+  @override
+  List<String> getLines() => <String>[_s];
+}
+
+/**
+ * Wrapper around a [LinkedUnit] and its corresponding [UnlinkedUnit].
+ */
+class UnitWrapper {
+  final LinkedUnit _linked;
+  final UnlinkedUnit _unlinked;
+
+  UnitWrapper(this._linked, this._unlinked);
+}