| // 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/syntactic_entity.dart'; |
| import 'package:analyzer/dart/ast/token.dart'; |
| import 'package:analyzer/dart/element/element.dart'; |
| import 'package:analyzer/error/error.dart'; |
| import 'package:analyzer/src/generated/source.dart'; |
| |
| /** |
| * An instance of [RangeFactory] made available for convenience. |
| */ |
| final RangeFactory range = new RangeFactory(); |
| |
| /** |
| * A factory used to create instances of [SourceRange] based on various |
| * syntactic and semantic entities. |
| */ |
| class RangeFactory { |
| /** |
| * Return a source range that covers the name of the given [element]. |
| */ |
| SourceRange elementName(Element element) { |
| return new SourceRange(element.nameOffset, element.nameLength); |
| } |
| |
| /** |
| * Return a source range that starts at the end of [leftEntity] and ends at |
| * the end of [rightEntity]. |
| */ |
| SourceRange endEnd(SyntacticEntity leftEntity, SyntacticEntity rightEntity) { |
| int offset = leftEntity.end; |
| int length = rightEntity.end - offset; |
| return new SourceRange(offset, length); |
| } |
| |
| /** |
| * Return a source range that starts at the end of [entity] and has the given |
| * [length]. |
| */ |
| SourceRange endLength(SyntacticEntity entity, int length) { |
| return new SourceRange(entity.end, length); |
| } |
| |
| /** |
| * Return a source range that starts at the end of [leftEntity] and ends at |
| * the start of [rightEntity]. |
| */ |
| SourceRange endStart( |
| SyntacticEntity leftEntity, SyntacticEntity rightEntity) { |
| int offset = leftEntity.end; |
| int length = rightEntity.offset - offset; |
| return new SourceRange(offset, length); |
| } |
| |
| /** |
| * Return a source range that covers the same range as the given [error]. |
| */ |
| SourceRange error(AnalysisError error) { |
| return new SourceRange(error.offset, error.length); |
| } |
| |
| /** |
| * Return a source range that covers the same range as the given [node]. |
| */ |
| SourceRange node(AstNode node) { |
| return new SourceRange(node.offset, node.length); |
| } |
| |
| /** |
| * Return a source range that covers all of the given [nodes] (that is, from |
| * the start of the first node to the end of the last node. |
| */ |
| SourceRange nodes(List<AstNode> nodes) { |
| if (nodes.isEmpty) { |
| return new SourceRange(0, 0); |
| } |
| return startEnd(nodes.first, nodes.last); |
| } |
| |
| /** |
| * Return a source range whose length is the same as the given [range], but |
| * whose offset is the offset of the given [range] with [offset] added to it. |
| */ |
| SourceRange offsetBy(SourceRange range, int offset) { |
| return new SourceRange(range.offset + offset, range.length); |
| } |
| |
| /** |
| * Return a source range that starts at the start of [leftEntity] and ends at |
| * the end of [rightEntity]. |
| */ |
| SourceRange startEnd( |
| SyntacticEntity leftEntity, SyntacticEntity rightEntity) { |
| int offset = leftEntity.offset; |
| int length = rightEntity.end - offset; |
| return new SourceRange(offset, length); |
| } |
| |
| /** |
| * Return a source range that starts at the start of [entity] and has a length of [length]. |
| */ |
| SourceRange startLength(SyntacticEntity entity, int length) { |
| return new SourceRange(entity.offset, length); |
| } |
| |
| /** |
| * Return a source range that starts at the given [startOffset] and ends at |
| * the given [endOffset]. |
| */ |
| SourceRange startOffsetEndOffset(int startOffset, int endOffset) { |
| int length = endOffset - startOffset; |
| return new SourceRange(startOffset, length); |
| } |
| |
| /** |
| * Return a source range that starts at the start of [leftEntity] and ends at |
| * the start of [rightEntity]. |
| */ |
| SourceRange startStart( |
| SyntacticEntity leftEntity, SyntacticEntity rightEntity) { |
| int offset = leftEntity.offset; |
| int length = rightEntity.offset - offset; |
| return new SourceRange(offset, length); |
| } |
| |
| /** |
| * Return a source range that covers the same range as the given [token]. |
| */ |
| SourceRange token(Token token) { |
| return new SourceRange(token.offset, token.length); |
| } |
| } |