Refactor: Removed ReplacementRange from test and ReplacementRange from src/. Copied contents of tes…

pkg/analyzer_plugin/lib/src/utilities/completion/replacement_range.dart

-// Copyright (c) 2017, 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 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/ast/standard_ast_factory.dart';
-import 'package:analyzer/dart/ast/token.dart';
-import 'package:analyzer/src/dart/ast/token.dart';
-import 'package:analyzer_plugin/src/utilities/completion/completion_target.dart';
-
-/**
- * Utility class for computing the code completion replacement range
- */
-class ReplacementRange {
-  int offset;
-  int length;
-
-  ReplacementRange(this.offset, this.length);
-
-  factory ReplacementRange.compute(int requestOffset, CompletionTarget target) {
-    bool isKeywordOrIdentifier(Token token) =>
-        token.type.isKeyword || token.type == TokenType.IDENTIFIER;
-
-    //TODO(danrubel) Ideally this needs to be pushed down into the contributors
-    // but that implies that each suggestion can have a different
-    // replacement offsent/length which would mean an API change
-
-    var entity = target.entity;
-    Token token = entity is AstNode ? entity.beginToken : entity;
-    if (token != null && requestOffset < token.offset) {
-      token = token.previous;
-    }
-    if (token != null) {
-      if (requestOffset == token.offset && !isKeywordOrIdentifier(token)) {
-        // If the insertion point is at the beginning of the current token
-        // and the current token is not an identifier
-        // then check the previous token to see if it should be replaced
-        token = token.previous;
-      }
-      if (token != null && isKeywordOrIdentifier(token)) {
-        if (token.offset <= requestOffset && requestOffset <= token.end) {
-          // Replacement range for typical identifier completion
-          return new ReplacementRange(token.offset, token.length);
-        }
-      }
-      if (token is StringToken) {
-        SimpleStringLiteral uri =
-            astFactory.simpleStringLiteral(token, token.lexeme);
-        Keyword keyword = token.previous?.keyword;
-        if (keyword == Keyword.IMPORT ||
-            keyword == Keyword.EXPORT ||
-            keyword == Keyword.PART) {
-          int start = uri.contentsOffset;
-          var end = uri.contentsEnd;
-          if (start <= requestOffset && requestOffset <= end) {
-            // Replacement range for import URI
-            return new ReplacementRange(start, end - start);
-          }
-        }
-      }
-    }
-    return new ReplacementRange(requestOffset, 0);
-  }
-}