Initial release.

test/source_map_stack_trace_test.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.
+
+import 'package:source_maps/source_maps.dart';
+import 'package:source_span/source_span.dart';
+import 'package:stack_trace/stack_trace.dart';
+import 'package:source_map_stack_trace/source_map_stack_trace.dart';
+import 'package:test/test.dart';
+
+/// A simple [Mapping] for tests that don't need anything special.
+final _simpleMapping = parseJson(
+    (new SourceMapBuilder()
+        ..addSpan(
+            new SourceMapSpan.identifier(
+                new SourceLocation(1,
+                    line: 1, column: 3, sourceUrl: "foo.dart"),
+                "qux"),
+            new SourceSpan(
+                new SourceLocation(8, line: 5, column: 0),
+                new SourceLocation(18, line: 15, column: 0),
+                "\n" * 10)))
+        .build("foo.dart.js.map"));
+
+void main() {
+  test("maps a JS line and column to a Dart line and span", () {
+    var trace = new Trace.parse("foo.dart.js 10:11  foo");
+    var frame = mapStackTrace(_simpleMapping, trace).frames.first;
+    expect(frame.uri, equals(Uri.parse("foo.dart")));
+
+    // These are +1 because stack_trace is 1-based whereas source_span is
+    // 0-basd.
+    expect(frame.line, equals(2));
+    expect(frame.column, equals(4));
+  });
+
+  test("ignores JS frames without line info", () {
+    var trace = new Trace.parse("""
+foo.dart.js 10:11  foo
+foo.dart.js        bar
+foo.dart.js 10:11  baz
+""");
+    var frames = mapStackTrace(_simpleMapping, trace).frames;
+
+    expect(frames.length, equals(2));
+    expect(frames.first.member, equals("foo"));
+    expect(frames.last.member, equals("baz"));
+  });
+
+  test("ignores JS frames without corresponding spans", () {
+    var trace = new Trace.parse("""
+foo.dart.js 10:11  foo
+foo.dart.js 1:1   bar
+foo.dart.js 10:11  baz
+""");
+
+    var frames = mapStackTrace(_simpleMapping, trace).frames;
+
+    expect(frames.length, equals(2));
+    expect(frames.first.member, equals("foo"));
+    expect(frames.last.member, equals("baz"));
+  });
+
+  test("falls back to column 0 for unlisted column", () {
+    var trace = new Trace.parse("foo.dart.js 10  foo");
+    var builder = new SourceMapBuilder()
+        ..addSpan(
+            new SourceMapSpan.identifier(
+                new SourceLocation(1,
+                    line: 1, column: 3, sourceUrl: "foo.dart"),
+                "qux"),
+            new SourceSpan(
+                new SourceLocation(8, line: 5, column: 0),
+                new SourceLocation(12, line: 9, column: 1),
+                "\n" * 4));
+
+    var mapping = parseJson(builder.build("foo.dart.js.map"));
+    var frame = mapStackTrace(mapping, trace).frames.first;
+    expect(frame.uri, equals(Uri.parse("foo.dart")));
+    expect(frame.line, equals(2));
+    expect(frame.column, equals(4));
+  });
+
+  test("uses package: URIs for frames within packageRoot", () {
+    var trace = new Trace.parse("foo.dart.js 10  foo");
+    var builder = new SourceMapBuilder()
+        ..addSpan(
+            new SourceMapSpan.identifier(
+                new SourceLocation(1,
+                    line: 1, column: 3, sourceUrl: "packages/foo/foo.dart"),
+                "qux"),
+            new SourceSpan(
+                new SourceLocation(8, line: 5, column: 0),
+                new SourceLocation(12, line: 9, column: 1),
+                "\n" * 4));
+
+    var mapping = parseJson(builder.build("foo.dart.js.map"));
+    var frame = mapStackTrace(mapping, trace, packageRoot: "packages/")
+        .frames.first;
+    expect(frame.uri, equals(Uri.parse("package:foo/foo.dart")));
+    expect(frame.line, equals(2));
+    expect(frame.column, equals(4));
+  });
+
+  test("uses dart: URIs for frames within sdkRoot", () {
+    var trace = new Trace.parse("foo.dart.js 10  foo");
+    var builder = new SourceMapBuilder()
+        ..addSpan(
+            new SourceMapSpan.identifier(
+                new SourceLocation(1,
+                    line: 1, column: 3, sourceUrl: "sdk/lib/async/foo.dart"),
+                "qux"),
+            new SourceSpan(
+                new SourceLocation(8, line: 5, column: 0),
+                new SourceLocation(12, line: 9, column: 1),
+                "\n" * 4));
+
+    var mapping = parseJson(builder.build("foo.dart.js.map"));
+    var frame = mapStackTrace(mapping, trace, sdkRoot: "sdk/").frames.first;
+    expect(frame.uri, equals(Uri.parse("dart:async/foo.dart")));
+    expect(frame.line, equals(2));
+    expect(frame.column, equals(4));
+  });
+
+  group("cleans up", () {
+    test("Firefox junk", () {
+      expect(_prettify("foo/<"), equals("foo"));
+      expect(_prettify("foo<"), equals("foo"));
+    });
+
+    test("arity indicators", () {
+      expect(_prettify(r"foo$1"), equals("foo"));
+      expect(_prettify(r"foo$1234"), equals("foo"));
+    });
+
+    test("closures", () {
+      expect(_prettify("foo_closure.call"), equals("foo.<fn>"));
+    });
+
+    test("nested closures", () {
+      expect(_prettify("foo__closure.call"), equals("foo.<fn>.<fn>"));
+      expect(_prettify("foo____closure.call"),
+          equals("foo.<fn>.<fn>.<fn>.<fn>"));
+    });
+
+    test(".call", () {
+      expect(_prettify("foo.call"), equals("foo"));
+    });
+
+    test("top-level functions", () {
+      expect(_prettify("dart.foo"), equals("foo"));
+    });
+
+    test("library namespaces", () {
+      expect(_prettify(r"my_library$foo"), equals("foo"));
+    });
+
+    test("static methods", () {
+      expect(_prettify(r"Foo.static.foo"), equals("foo"));
+    });
+
+    test("instance methods", () {
+      expect(_prettify(r"Foo_bar__baz"), equals("Foo.bar._baz"));
+    });
+
+    test("lots of stuff", () {
+      expect(_prettify(r"lib$Foo.static.lib$Foo_closure.call$0/<"),
+          equals("Foo.<fn>"));
+    });
+  });
+}
+
+/// Runs the mapper's prettification logic on [member] and returns the result.
+String _prettify(String member) {
+  var trace = new Trace([new Frame(Uri.parse("foo.dart.js"), 10, 11, member)]);
+  return mapStackTrace(_simpleMapping, trace).frames.first.member;
+}