Merge kernel closure conversion into the Dart SDK

pkg/kernel/test/closures/kernel_chain.dart

+// Copyright (c) 2016, 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.md file.
+
+library test.kernel.closures.suite;
+
+import 'dart:async' show Future;
+
+import 'dart:io' show Directory, File, IOSink;
+
+import 'dart:typed_data' show Uint8List;
+
+import 'package:kernel/kernel.dart' show Repository, loadProgramFromBinary;
+
+import 'package:kernel/text/ast_to_text.dart' show Printer;
+
+import 'package:testing/testing.dart'
+    show ChainContext, Result, StdioProcess, Step;
+
+import 'package:kernel/ast.dart' show Library, Program;
+
+import 'package:kernel/verifier.dart' show verifyProgram;
+
+import 'package:kernel/binary/ast_to_binary.dart' show BinaryPrinter;
+
+import 'package:kernel/binary/ast_from_binary.dart' show BinaryBuilder;
+
+import 'package:kernel/binary/loader.dart' show BinaryLoader;
+
+Future<bool> fileExists(Uri base, String path) async {
+  return await new File.fromUri(base.resolve(path)).exists();
+}
+
+class Print extends Step<Program, Program, ChainContext> {
+  const Print();
+
+  String get name => "print";
+
+  Future<Result<Program>> run(Program program, _) async {
+    StringBuffer sb = new StringBuffer();
+    for (Library library in program.libraries) {
+      Printer printer = new Printer(sb);
+      if (library.importUri.scheme != "dart") {
+        printer.writeLibraryFile(library);
+      }
+    }
+    print("$sb");
+    return pass(program);
+  }
+}
+
+class SanityCheck extends Step<Program, Program, ChainContext> {
+  const SanityCheck();
+
+  String get name => "sanity check";
+
+  Future<Result<Program>> run(Program program, _) async {
+    try {
+      verifyProgram(program);
+      return pass(program);
+    } catch (e, s) {
+      return crash(e, s);
+    }
+  }
+}
+
+class MatchExpectation extends Step<Program, Program, ChainContext> {
+  final String suffix;
+
+  final bool updateExpectations;
+
+  const MatchExpectation(this.suffix, {this.updateExpectations: true});
+
+  String get name => "match expectations";
+
+  Future<Result<Program>> run(Program program, _) async {
+    Library library = program.libraries
+        .firstWhere((Library library) => library.importUri.scheme != "dart");
+    Uri uri = library.importUri;
+    StringBuffer buffer = new StringBuffer();
+    new Printer(buffer).writeLibraryFile(library);
+
+    File expectedFile = new File("${uri.toFilePath()}$suffix");
+    if (await expectedFile.exists()) {
+      String expected = await expectedFile.readAsString();
+      if (expected.trim() != "$buffer".trim()) {
+        if (!updateExpectations) {
+          String diff = await runDiff(expectedFile.uri, "$buffer");
+          return fail(null, "$uri doesn't match ${expectedFile.uri}\n$diff");
+        }
+      } else {
+        return pass(program);
+      }
+    }
+    if (updateExpectations) {
+      await openWrite(expectedFile.uri, (IOSink sink) {
+        sink.writeln("$buffer".trim());
+      });
+      return pass(program);
+    } else {
+      return fail(
+          program,
+          """
+Please create file ${expectedFile.path} with this content:
+$buffer""");
+    }
+  }
+}
+
+class WriteDill extends Step<Program, Uri, ChainContext> {
+  const WriteDill();
+
+  String get name => "write .dill";
+
+  Future<Result<Uri>> run(Program program, _) async {
+    Directory tmp = await Directory.systemTemp.createTemp();
+    Uri uri = tmp.uri.resolve("generated.dill");
+    File generated = new File.fromUri(uri);
+    IOSink sink = generated.openWrite();
+    try {
+      new BinaryPrinter(sink).writeProgramFile(program);
+    } catch (e, s) {
+      return fail(uri, e, s);
+    } finally {
+      print("Wrote `${generated.path}`");
+      await sink.close();
+    }
+    return pass(uri);
+  }
+}
+
+class ReadDill extends Step<Uri, Uri, ChainContext> {
+  const ReadDill();
+
+  String get name => "read .dill";
+
+  Future<Result<Uri>> run(Uri uri, _) async {
+    try {
+      loadProgramFromBinary(uri.toFilePath());
+    } catch (e, s) {
+      return fail(uri, e, s);
+    }
+    return pass(uri);
+  }
+}
+
+class Copy extends Step<Program, Program, ChainContext> {
+  const Copy();
+
+  String get name => "copy program";
+
+  Future<Result<Program>> run(Program program, _) async {
+    BytesCollector sink = new BytesCollector();
+    new BinaryPrinter(sink).writeProgramFile(program);
+    Uint8List bytes = sink.collect();
+    BinaryLoader loader = new BinaryLoader(new Repository());
+    return pass(new BinaryBuilder(loader, bytes).readProgramFile());
+  }
+}
+
+class BytesCollector implements Sink<List<int>> {
+  final List<List<int>> lists = <List<int>>[];
+
+  int length = 0;
+
+  void add(List<int> data) {
+    lists.add(data);
+    length += data.length;
+  }
+
+  Uint8List collect() {
+    Uint8List result = new Uint8List(length);
+    int offset = 0;
+    for (List<int> list in lists) {
+      result.setRange(offset, offset += list.length, list);
+    }
+    lists.clear();
+    length = 0;
+    return result;
+  }
+
+  void close() {}
+}
+
+Future<String> runDiff(Uri expected, String actual) async {
+  StdioProcess process = await StdioProcess
+      .run("diff", <String>["-u", expected.toFilePath(), "-"], input: actual);
+  return process.output;
+}
+
+Future openWrite(Uri uri, f(IOSink sink)) async {
+  IOSink sink = new File.fromUri(uri).openWrite();
+  try {
+    await f(sink);
+  } finally {
+    await sink.close();
+  }
+  print("Wrote $uri");
+}