| // Copyright (c) 2014, 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 computer.navigation; |
| |
| import 'package:analyzer/src/generated/ast.dart'; |
| import 'package:analyzer/src/generated/element.dart'; |
| import 'package:analyzer/src/generated/scanner.dart'; |
| import 'package:analyzer/src/generated/source.dart'; |
| |
| |
| /** |
| * A computer for navigation regions in a Dart [CompilationUnit]. |
| */ |
| class DartUnitNavigationComputer { |
| final CompilationUnit _unit; |
| |
| List<Map<String, Object>> _regions = <Map<String, Object>>[]; |
| |
| DartUnitNavigationComputer(this._unit); |
| |
| /** |
| * Returns the computed navigation regions, not `null`. |
| */ |
| List<Map<String, Object>> compute() { |
| _unit.accept(new _DartUnitNavigationComputerVisitor(this)); |
| return new List.from(_regions); |
| } |
| |
| void _addRegion(int offset, int length, Element element) { |
| Map<String, Object> target = _createTarget(element); |
| if (target == null) { |
| return; |
| } |
| _regions.add({ |
| 'offset': offset, |
| 'length': length, |
| 'targets': [target] |
| }); |
| } |
| |
| void _addRegion_nodeStart_nodeEnd(AstNode a, AstNode b, Element element) { |
| int offset = a.offset; |
| int length = b.end - offset; |
| _addRegion(offset, length, element); |
| } |
| |
| void _addRegion_nodeStart_nodeStart(AstNode a, AstNode b, Element element) { |
| int offset = a.offset; |
| int length = b.offset - offset; |
| _addRegion(offset, length, element); |
| } |
| |
| void _addRegion_tokenStart_nodeEnd(Token a, AstNode b, Element element) { |
| int offset = a.offset; |
| int length = b.end - offset; |
| _addRegion(offset, length, element); |
| } |
| |
| void _addRegionForNode(AstNode node, Element element) { |
| int offset = node.offset; |
| int length = node.length; |
| _addRegion(offset, length, element); |
| } |
| |
| void _addRegionForToken(Token token, Element element) { |
| int offset = token.offset; |
| int length = token.length; |
| _addRegion(offset, length, element); |
| } |
| |
| /** |
| * Returns the JSON for the given [Element], maybe `null` if `null` was given. |
| */ |
| Map<String, Object> _createTarget(Element element) { |
| if (element == null) { |
| return null; |
| } |
| if (element is FieldFormalParameterElement) { |
| element = (element as FieldFormalParameterElement).field; |
| } |
| // prepare Source |
| Source source = element.source; |
| if (source == null) { |
| return null; |
| } |
| // prepare location |
| int offset = element.nameOffset; |
| int length = element.displayName.length; |
| if (element is CompilationUnitElement) { |
| offset = 0; |
| length = 0; |
| } |
| // return as JSON |
| return { |
| 'file': source.fullName, |
| 'offset': offset, |
| 'length': length, |
| 'elementId': element.location.encoding |
| }; |
| } |
| } |
| |
| |
| |
| class _DartUnitNavigationComputerVisitor extends RecursiveAstVisitor { |
| final DartUnitNavigationComputer computer; |
| |
| _DartUnitNavigationComputerVisitor(this.computer); |
| |
| @override |
| visitAssignmentExpression(AssignmentExpression node) { |
| computer._addRegionForToken(node.operator, node.bestElement); |
| return super.visitAssignmentExpression(node); |
| } |
| |
| @override |
| visitBinaryExpression(BinaryExpression node) { |
| computer._addRegionForToken(node.operator, node.bestElement); |
| return super.visitBinaryExpression(node); |
| } |
| |
| @override |
| visitConstructorDeclaration(ConstructorDeclaration node) { |
| // associate constructor with "T" or "T.name" |
| { |
| AstNode firstNode = node.returnType; |
| AstNode lastNode = node.name; |
| if (lastNode == null) { |
| lastNode = firstNode; |
| } |
| if (firstNode != null && lastNode != null) { |
| computer._addRegion_nodeStart_nodeEnd(firstNode, lastNode, node.element); |
| } |
| } |
| return super.visitConstructorDeclaration(node); |
| } |
| |
| @override |
| visitExportDirective(ExportDirective node) { |
| ExportElement exportElement = node.element; |
| if (exportElement != null) { |
| Element element = exportElement.exportedLibrary; |
| computer._addRegion_tokenStart_nodeEnd(node.keyword, node.uri, element); |
| } |
| return super.visitExportDirective(node); |
| } |
| |
| @override |
| visitImportDirective(ImportDirective node) { |
| ImportElement importElement = node.element; |
| if (importElement != null) { |
| Element element = importElement.importedLibrary; |
| computer._addRegion_tokenStart_nodeEnd(node.keyword, node.uri, element); |
| } |
| return super.visitImportDirective(node); |
| } |
| |
| @override |
| visitIndexExpression(IndexExpression node) { |
| computer._addRegionForToken(node.rightBracket, node.bestElement); |
| return super.visitIndexExpression(node); |
| } |
| |
| @override |
| visitInstanceCreationExpression(InstanceCreationExpression node) { |
| Element element = node.staticElement; |
| if (element != null && element.isSynthetic) { |
| element = element.enclosingElement; |
| } |
| computer._addRegion_nodeStart_nodeStart(node, node.argumentList, element); |
| return super.visitInstanceCreationExpression(node); |
| } |
| |
| @override |
| visitPartDirective(PartDirective node) { |
| computer._addRegion_tokenStart_nodeEnd(node.keyword, node.uri, node.element); |
| return super.visitPartDirective(node); |
| } |
| |
| @override |
| visitPartOfDirective(PartOfDirective node) { |
| computer._addRegion_tokenStart_nodeEnd(node.keyword, node.libraryName, node.element); |
| return super.visitPartOfDirective(node); |
| } |
| |
| @override |
| visitPostfixExpression(PostfixExpression node) { |
| computer._addRegionForToken(node.operator, node.bestElement); |
| return super.visitPostfixExpression(node); |
| } |
| |
| @override |
| visitPrefixExpression(PrefixExpression node) { |
| computer._addRegionForToken(node.operator, node.bestElement); |
| return super.visitPrefixExpression(node); |
| } |
| |
| @override |
| visitSimpleIdentifier(SimpleIdentifier node) { |
| if (node.parent is ConstructorDeclaration) { |
| } else { |
| computer._addRegionForNode(node, node.bestElement); |
| } |
| return super.visitSimpleIdentifier(node); |
| } |
| } |