Code completion progress part two of fix to https://github.com/dart-lang/sdk/issues/24254, addition…

pkg/analysis_server/lib/src/services/completion/dart/variable_name_contributor.dart

Index: pkg/analysis_server/lib/src/services/completion/dart/variable_name_contributor.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/dart/variable_name_contributor.dart b/pkg/analysis_server/lib/src/services/completion/dart/variable_name_contributor.dart
new file mode 100644
index 0000000000000000000000000000000000000000..71ac473ffc0dd12cb6b703d93d75189a5fa9a1c5
--- /dev/null
+++ b/pkg/analysis_server/lib/src/services/completion/dart/variable_name_contributor.dart
@@ -0,0 +1,94 @@
+// Copyright (c) 2015, 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 services.completion.contributor.dart.variableName;
+
+import 'dart:async';
+
+import 'package:analysis_server/src/protocol_server.dart'
+    show CompletionSuggestion, CompletionSuggestionKind;
+import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
+import 'package:analysis_server/src/services/completion/dart/completion_manager.dart'
+    show DartCompletionRequestImpl;
+import 'package:analysis_server/src/services/completion/dart/optype.dart';
+import 'package:analysis_server/src/services/correction/name_suggestion.dart';
+import 'package:analyzer/dart/ast/ast.dart';
+
+CompletionSuggestion _createNameSuggestion(String name) {
+  if (name == null || name.isEmpty) {
+    return null;
+  }
+  return new CompletionSuggestion(CompletionSuggestionKind.IDENTIFIER,
+      DART_RELEVANCE_DEFAULT, name, name.length, 0, false, false);
+}
+
+String _getStringName(Identifier id) {
+  if (id == null) {
+    return null;
+  }
+  if (id is SimpleIdentifier) {
+    return id.name;
+  } else if (id is PrefixedIdentifier) {
+    return id.identifier.name;
+  }
+  return id.name;
+}
+
+/**
+ * A contributor for calculating suggestions for variable names.
+ */
+class VariableNameContributor extends DartCompletionContributor {
+  @override
+  Future<List<CompletionSuggestion>> computeSuggestions(
+      DartCompletionRequest request) async {
+    OpType optype = (request as DartCompletionRequestImpl).opType;
+
+    // Collect suggestions from the specific child [AstNode] that contains
+    // the completion offset and all of its parents recursively.
+    if (optype.includeVarNameSuggestions) {
+      // Resolution not needed for this completion
+
+      AstNode node = request.target.containingNode;
+      String strName = null;
+      if (node is ExpressionStatement) {
+        if (node.expression is Identifier) {
+          strName = _getStringName(node.expression as Identifier);
+        }
+      } else if (node is VariableDeclarationList) {
+        strName = _getStringName(node.type.name);
+      } else if (node is TopLevelVariableDeclaration) {
+        // The parser parses 'Foo ' and 'Foo ;' differently, resulting in the
+        // following.
+        // 'Foo ': handled above
+        // 'Foo ;': TopLevelVariableDeclaration with type null, and a first
+        // variable of 'Foo'
+        VariableDeclarationList varDeclarationList = node.variables;
+        if (varDeclarationList.type != null) {
+          strName = _getStringName(varDeclarationList.type.name);
+        } else {
+          NodeList<VariableDeclaration> varDeclarations =
+              varDeclarationList.variables;
+          if (varDeclarations.length == 1) {
+            VariableDeclaration varDeclaration = varDeclarations.first;
+            strName = _getStringName(varDeclaration.name);
+          }
+        }
+      }
+      if (strName == null) {
+        return EMPTY_LIST;
+      }
+
+      List<String> variableNameSuggestions = getCamelWordCombinations(strName);
+      List<CompletionSuggestion> suggestions = <CompletionSuggestion>[];
+      for (String varName in variableNameSuggestions) {
+        CompletionSuggestion suggestion = _createNameSuggestion(varName);
+        if (suggestion != null) {
+          suggestions.add(suggestion);
+        }
+      }
+      return suggestions;
+    }
+    return EMPTY_LIST;
+  }
+}