Create and test source mapping for invocations.

pkg/compiler/lib/src/io/start_end_information.dart

+// 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.
+
+/// Source information system that maps spans of Dart AST nodes to spans of
+/// JavaScript nodes.
+
+library dart2js.source_information.start_end;
+
+import '../dart2jslib.dart' show
+    MessageKind,
+    SourceSpan;
+import '../elements/elements.dart' show
+    AstElement,
+    LocalElement;
+import '../js/js.dart' as js;
+import '../js/js_source_mapping.dart';
+import '../scanner/scannerlib.dart' show Token;
+import '../tree/tree.dart' show Node, Send;
+
+import 'source_file.dart';
+import 'source_information.dart';
+
+/// Source information that contains start source position and optionally an
+/// end source position.
+class StartEndSourceInformation extends SourceInformation {
+  @override
+  final SourceLocation startPosition;
+
+  @override
+  final SourceLocation endPosition;
+
+  StartEndSourceInformation(this.startPosition, [this.endPosition]);
+
+  @override
+  List<SourceLocation> get sourceLocations {
+    if (endPosition == null) {
+      return <SourceLocation>[startPosition];
+    } else {
+      return <SourceLocation>[startPosition, endPosition];
+    }
+  }
+
+  @override
+  SourceSpan get sourceSpan {
+    Uri uri = startPosition.sourceUri;
+    int begin = startPosition.offset;
+    int end = endPosition == null ? begin : endPosition.offset;
+    return new SourceSpan(uri, begin, end);
+  }
+
+  int get hashCode {
+    return 0x7FFFFFFF &
+           (startPosition.hashCode * 17 + endPosition.hashCode * 19);
+  }
+
+  bool operator ==(other) {
+    if (identical(this, other)) return true;
+    if (other is! StartEndSourceInformation) return false;
+    return startPosition == other.startPosition &&
+           endPosition == other.endPosition;
+  }
+
+  // TODO(johnniwinther): Remove this method. Source information should be
+  // computed based on the element by provided from statements and expressions.

[floitsch, 2015/06/29 08:55:52]

-by-

[Johnni Winther, 2015/06/29 12:36:29]

TODO was stale. Replaced with the appropriate.

+  static StartEndSourceInformation computeSourceInformation(
+      AstElement element) {
+
+    AstElement implementation = element.implementation;
+    SourceFile sourceFile = implementation.compilationUnit.script.file;
+    String name = computeElementNameForSourceMaps(element);
+    Node node = implementation.node;
+    Token beginToken;
+    Token endToken;
+    if (node == null) {
+      // Synthesized node. Use the enclosing element for the location.
+      beginToken = endToken = element.position;
+    } else {
+      beginToken = node.getBeginToken();
+      endToken = node.getEndToken();
+    }
+    // TODO(podivilov): find the right sourceFile here and remove offset

[floitsch, 2015/06/29 08:55:52]

I think we can safely reassign this TODO.

[Johnni Winther, 2015/06/29 12:36:29]

Done.

+    // checks below.
+    SourceLocation sourcePosition, endSourcePosition;
+    if (beginToken.charOffset < sourceFile.length) {
+      sourcePosition =
+          new OffsetSourceLocation(sourceFile, beginToken.charOffset, name);
+    }
+    if (endToken.charOffset < sourceFile.length) {
+      endSourcePosition =
+          new OffsetSourceLocation(sourceFile, endToken.charOffset, name);
+    }
+    return new StartEndSourceInformation(sourcePosition, endSourcePosition);
+  }
+
+  String get shortText {
+    StringBuffer sb = new StringBuffer();
+    sb.write('${startPosition.sourceUri.pathSegments.last}:');
+    // Use 1-based line/startPosition info to match usual dart tool output.
+    sb.write('[${startPosition.line + 1},${startPosition.column + 1}]');
+    if (endPosition != null) {
+      sb.write('-[${endPosition.line + 1},${endPosition.column + 1}]');
+    }
+    return sb.toString();
+  }
+
+  String toString() {
+    StringBuffer sb = new StringBuffer();

[floitsch, 2015/06/29 08:55:52]

create a helper function?
Only seems to differ in the length of the uri.

[Johnni Winther, 2015/06/29 12:36:29]

Done.

+    sb.write('${startPosition.sourceUri}:');
+    // Use 1-based line/column info to match usual dart tool output.
+    sb.write('[${startPosition.line + 1},${startPosition.column + 1}]');
+    if (endPosition != null) {
+      sb.write('-[${endPosition.line + 1},${endPosition.column + 1}]');
+    }
+    return sb.toString();
+  }
+}
+
+class StartEndSourceInformationStrategy
+    implements JavaScriptSourceInformationStrategy {
+  const StartEndSourceInformationStrategy();
+
+  @override
+  SourceInformationBuilder createBuilderForContext(AstElement element) {
+    return new StartEndSourceInformationBuilder(element);
+  }
+
+  @override
+  SourceInformationProcessor createProcessor(SourceMapper sourceMapper) {
+    return new StartEndSourceInformationProcessor(sourceMapper);
+  }
+}
+
+class StartEndSourceInformationProcessor extends SourceInformationProcessor {
+  final SourceMapper sourceMapper;
+  js.Node root;

[floitsch, 2015/06/29 08:55:52]

comments what "root" is.
unless there are subclasses or accesses from the outside, it is only used as
boolean (in which case a boolean would be better).

[Johnni Winther, 2015/06/29 12:36:29]

Done.

+
+  StartEndSourceInformationProcessor(this.sourceMapper);
+
+  @override
+  void onPositions(js.Node node,
+                   int startPosition,
+                   int endPosition,
+                   int closingPosition) {
+    if (node.sourceInformation != null) {
+      StartEndSourceInformation sourceInformation = node.sourceInformation;
+      sourceMapper.register(
+          node, startPosition, sourceInformation.startPosition);
+      if (sourceInformation.endPosition != null) {
+        sourceMapper.register(node, endPosition, sourceInformation.endPosition);
+      }
+      if (root == null) {
+        sourceMapper.register(node, endPosition, null);
+        root = node;
+      }
+    }
+  }
+}
+
+/// [SourceInformationBuilder] that generates [PositionSourceInformation].
+class StartEndSourceInformationBuilder extends SourceInformationBuilder {
+  final SourceFile sourceFile;
+  final String name;
+
+  StartEndSourceInformationBuilder(AstElement element)
+      : sourceFile = element.compilationUnit.script.file,
+        name = computeElementNameForSourceMaps(element);
+
+  SourceInformation buildDeclaration(AstElement element) {
+    return StartEndSourceInformation.computeSourceInformation(element);
+  }
+
+  SourceLocation sourceFileLocationForToken(Token token) {
+    SourceLocation location =
+        new OffsetSourceLocation(sourceFile, token.charOffset, name);
+    checkValidSourceFileLocation(location, sourceFile, token.charOffset);
+    return location;
+  }
+
+  void checkValidSourceFileLocation(
+      SourceLocation location, SourceFile sourceFile, int offset) {
+    if (!location.isValid) {
+      throw MessageKind.INVALID_SOURCE_FILE_LOCATION.message(
+          {'offset': offset,
+           'fileName': sourceFile.filename,
+           'length': sourceFile.length});
+    }
+  }
+
+  @override
+  SourceInformation buildLoop(Node node) {
+    return new StartEndSourceInformation(
+        sourceFileLocationForToken(node.getBeginToken()),
+        sourceFileLocationForToken(node.getEndToken()));
+  }
+
+  @override
+  SourceInformation buildGeneric(Node node) {
+    return new StartEndSourceInformation(
+        sourceFileLocationForToken(node.getBeginToken()));
+  }
+
+  @override
+  SourceInformation buildReturn(Node node) {
+    return buildGeneric(node);
+  }
+
+  @override
+  SourceInformation buildGet(Node node) => buildGeneric(node);
+
+  @override
+  SourceInformation buildAssignment(Node node) => buildGeneric(node);
+
+  @override
+  SourceInformation buildCall(Node receiver, Node call) {
+    return buildGeneric(receiver);
+  }
+
+  @override
+  SourceInformation buildIf(Node node) => buildGeneric(node);
+
+  @override
+  SourceInformationBuilder forContext(
+      AstElement element, {SourceInformation sourceInformation}) {
+    return new StartEndSourceInformationBuilder(element);
+  }
+}
+
+
+