| // 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 { |
| // Copied from analysis_server/lib/src/services/completion/dart/completion_manager.dart |
| 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 |
| // offset/length which would mean an API change. |
| |
| var entity = target.entity; |
| Token token = entity is AstNode ? entity.beginToken : entity; |
| // TODO(brianwilkerson) If this class is every needed outside of tests, move |
| // the code below into RangeFactory and use a SourceRange rather than a |
| // ReplacementRange. |
| 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); |
| } |
| } |