Remove dart backend

lib/src/codegen/dart_codegen.dart

Index: lib/src/codegen/dart_codegen.dart
diff --git a/lib/src/codegen/dart_codegen.dart b/lib/src/codegen/dart_codegen.dart
deleted file mode 100644
index 679831bf059002584550b8ce900f05d52b4cbf89..0000000000000000000000000000000000000000
--- a/lib/src/codegen/dart_codegen.dart
+++ /dev/null
@@ -1,456 +0,0 @@
-// 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.
-
-library dev_compiler.src.codegen.dart_codegen;
-
-import 'dart:io' show File;
-
-import 'package:analyzer/analyzer.dart' as analyzer;
-import 'package:analyzer/src/generated/ast.dart';
-import 'package:analyzer/src/generated/element.dart';
-import 'package:analyzer/src/generated/java_core.dart' as java_core;
-import 'package:analyzer/src/generated/scanner.dart' show Token;
-import 'package:logging/logging.dart' as logger;
-import 'package:path/path.dart' as path;
-
-import 'package:dev_compiler/devc.dart' show AbstractCompiler;
-import 'package:dev_compiler/src/info.dart';
-import 'package:dev_compiler/src/options.dart';
-import 'package:dev_compiler/src/utils.dart' as utils;
-import 'ast_builder.dart';
-import 'code_generator.dart' as codegenerator;
-import 'reify_coercions.dart'
-    show CoercionReifier, NewTypeIdDesc, InstrumentedRuntime;
-
-final _log = new logger.Logger('dev_compiler.dart_codegen');
-
-class DevCompilerRuntime extends InstrumentedRuntime {
-  Identifier _runtimeId = AstBuilder.identifierFromString("DEVC\$RT");
-
-  Identifier _castId;
-  Identifier _typeToTypeId;
-  Identifier _wrapId;
-
-  DevCompilerRuntime() {
-    _castId = _prefixId(AstBuilder.identifierFromString("cast"));
-    _typeToTypeId = _prefixId(AstBuilder.identifierFromString("type"));
-    _wrapId = _prefixId(AstBuilder.identifierFromString("wrap"));
-  }
-
-  String get importString {
-    var name = _runtimeId;
-    var uri = "package:dev_compiler/runtime/dart_logging_runtime.dart";
-    return "import '$uri' as $name;";
-  }
-
-  Identifier _prefixId(Identifier id) =>
-      AstBuilder.prefixedIdentifier(_runtimeId, id);
-
-  Identifier runtimeId(RuntimeOperation oper) {
-    if (oper.operation == "cast") return _castId;
-    if (oper.operation == "wrap") return _wrapId;
-    if (oper.operation == "type") return _typeToTypeId;
-    assert(false);
-    return null;
-  }
-
-  Expression runtimeOperation(RuntimeOperation oper) {
-    var id = runtimeId(oper);
-    var args = oper.arguments;
-    return AstBuilder.application(id, args);
-  }
-
-  @override
-  Expression wrap(Expression coercion, Expression e, Expression fromType,
-      Expression toType, Expression dartIs, String kind, String location) {
-    var k = AstBuilder.stringLiteral(kind);
-    var key = AstBuilder.multiLineStringLiteral(location);
-    var arguments = <Expression>[coercion, e, fromType, toType, k, key, dartIs];
-    return new RuntimeOperation("wrap", arguments);
-  }
-
-  Expression cast(Expression e, Expression fromType, Expression toType,
-      Expression dartIs, String kind, String location, bool ground) {
-    var k = AstBuilder.stringLiteral(kind);
-    var key = AstBuilder.multiLineStringLiteral(location);
-    var g = AstBuilder.booleanLiteral(ground);
-    var arguments = <Expression>[e, fromType, toType, k, key, dartIs, g];
-    return new RuntimeOperation("cast", arguments);
-  }
-
-  Expression type(Expression witnessFunction) {
-    return new RuntimeOperation("type", <Expression>[witnessFunction]);
-  }
-}
-
-// TODO(leafp) This is kind of a hack, but it works for now.
-class FileWriter extends java_core.PrintStringWriter {
-  final CompilerOptions options;
-  String _path;
-  FileWriter(this.options, this._path);
-  int indent = 0;
-  int withinInterpolationExpression = 0;
-  bool insideForLoop = false;
-
-  void print(x) {
-    if (!options.formatOutput) {
-      super.print(x);
-      return;
-    }
-
-    switch (x) {
-      case '{':
-        indent++;
-        x = '{\n${"  " * indent}';
-        break;
-      case ';':
-        if (!insideForLoop) {
-          x = ';\n${"  " * indent}';
-        }
-        break;
-      case 'for (':
-        insideForLoop = true;
-        break;
-      case ') ':
-        insideForLoop = false;
-        break;
-      case r'${':
-        withinInterpolationExpression++;
-        break;
-      case '}':
-        if (withinInterpolationExpression > 0) {
-          withinInterpolationExpression--;
-        } else {
-          indent--;
-          x = '}\n${"  " * indent}';
-        }
-        break;
-    }
-    super.print(x);
-  }
-
-  void finalize() {
-    String s = toString();
-    _log.fine("Writing file $_path");
-    new File(_path).writeAsStringSync(s);
-  }
-}
-
-bool _identifierNeedsQualification(Identifier id, NewTypeIdDesc desc) {
-  var library = desc.importedFrom;
-  if (library == null) return false;
-  if (library.isDartCore) return false;
-  if (desc.fromCurrent) return false;
-  return true;
-}
-
-// This class just holds some additional syntactic helpers and
-// fixes to the general ToSourceVisitor for use by subclasses.
-abstract class UnitGeneratorCommon extends analyzer.ToSourceVisitor {
-  UnitGeneratorCommon(java_core.PrintWriter out) : super(out);
-
-  void output(String s);
-  void outputln(String s);
-
-  // Copied from ast.dart
-  void visitNodeListWithSeparatorAndSuffix(
-      NodeList<AstNode> nodes, String separator, String suffix) {
-    if (nodes != null) {
-      int size = nodes.length;
-      if (size > 0) {
-        for (int i = 0; i < size; i++) {
-          if (i > 0) {
-            output(separator);
-          }
-          nodes[i].accept(this);
-        }
-        output(suffix);
-      }
-    }
-  }
-
-  // Copied from ast.dart
-  void visitListWithSeparatorAndPrefix(
-      String prefix, List<AstNode> nodes, String separator) {
-    if (nodes != null) {
-      int size = nodes.length;
-      if (size > 0) {
-        output(prefix);
-        for (int i = 0; i < size; i++) {
-          if (i > 0) {
-            output(separator);
-          }
-          nodes[i].accept(this);
-        }
-      }
-    }
-  }
-
-  // Copied from ast.dart
-  void visitNodeListWithSeparatorAndPrefix(
-      String prefix, NodeList<AstNode> nodes, String separator) {
-    visitListWithSeparatorAndPrefix(prefix, nodes, separator);
-  }
-
-  // Copied from ast.dart
-  void visitTokenWithSuffix(Token token, String suffix) {
-    if (token != null) {
-      output(token.lexeme);
-      output(suffix);
-    }
-  }
-
-  // Copied from ast.dart
-  void safelyVisitNode(AstNode node) {
-    if (node != null) {
-      node.accept(this);
-    }
-  }
-
-  // Copied from ast.dart
-  void visitNodeWithPrefix(String prefix, AstNode node) {
-    if (node != null) {
-      output(prefix);
-      node.accept(this);
-    }
-  }
-
-  // Copied from ast.dart
-  void visitNodeWithSuffix(AstNode node, String suffix) {
-    if (node != null) {
-      node.accept(this);
-      output(suffix);
-    }
-  }
-
-  // Overridden to add external keyword if present
-  @override
-  Object visitFunctionDeclaration(FunctionDeclaration node) {
-    visitNodeListWithSeparatorAndSuffix(node.metadata, " ", " ");
-    visitTokenWithSuffix(node.externalKeyword, " ");
-    visitNodeWithSuffix(node.returnType, " ");
-    visitTokenWithSuffix(node.propertyKeyword, " ");
-    safelyVisitNode(node.name);
-    safelyVisitNode(node.functionExpression);
-    return null;
-  }
-}
-
-// TODO(leafp) Not sure if this is the right way to generate
-// Dart source going forward, but it's a quick way to get started.
-class UnitGenerator extends UnitGeneratorCommon with ConversionVisitor<Object> {
-  CompilationUnit unit;
-  final java_core.PrintWriter _out;
-  final String outDir;
-  Set<LibraryElement> _extraImports;
-  final _runtime;
-  bool _qualifyNames = true;
-  Map<Identifier, NewTypeIdDesc> _newIdentifiers;
-
-  UnitGenerator(this.unit, java_core.PrintWriter out, String this.outDir,
-      this._extraImports, this._newIdentifiers, this._runtime)
-      : _out = out,
-        super(out);
-
-  void output(String s) => _out.print(s);
-  void outputln(String s) => _out.println(s);
-
-  // Choose a canonical prefix for a library that we are adding.
-  // Currently just chooses something unlikely to conflict with a user
-  // prefix.
-  // TODO(leafp): Make this robust.
-  String canonizeLibraryName(String name) {
-    name = name.replaceAll(".", "DOT");
-    name = "DDC\$$name\$";
-    return name;
-  }
-
-  // Split the directives into the various kinds (since there are restrictions
-  // in the syntax as to order of directives).
-  Map<String, List<Directive>> splitDirectives(NodeList<Directive> directives) {
-    return {
-      'export': directives.where((d) => d is ExportDirective).toList(),
-      'import': directives.where((d) => d is ImportDirective).toList(),
-      'library': directives.where((d) => d is LibraryDirective).toList(),
-      'part': directives.where((d) => d is PartDirective).toList(),
-      'partof': directives.where((d) => d is PartOfDirective).toList(),
-    };
-  }
-
-  // Build the set of import directives corresponding to the
-  // extra imports required by the types that we add in via
-  // inference
-  List<String> buildExtraImportDirectives() {
-    return _extraImports.map((lib) {
-      var name = utils.canonicalLibraryName(lib);
-      name = canonizeLibraryName(name);
-      var uri = codegenerator.CodeGenerator.uriFor(lib);
-      return "import '$uri' as $name;";
-    }).toList();
-  }
-
-  // Rewrite the import directives with additional library imports
-  // covering the inferred types added in as part of this pass.
-  void _visitDirectives(String prefix, List<Directive> directives) {
-    _qualifyNames = false;
-    var ds = splitDirectives(directives);
-    visitListWithSeparatorAndPrefix(prefix, ds['library'], " ");
-    if (ds['library'].length != 0) {
-      assert(ds['partof'].length == 0);
-      var es = buildExtraImportDirectives();
-      es.add(_runtime.importString);
-      es.forEach(outputln);
-    }
-    visitListWithSeparatorAndPrefix(prefix, ds['partof'], " ");
-    visitListWithSeparatorAndPrefix(prefix, ds['import'], " ");
-    visitListWithSeparatorAndPrefix(prefix, ds['export'], " ");
-    visitListWithSeparatorAndPrefix(prefix, ds['part'], " ");
-    _qualifyNames = true;
-  }
-
-  @override
-  Object visitNode(AstNode node) {
-    if (node != null) {
-      node.visitChildren(this);
-    }
-    return null;
-  }
-
-  @override
-  Object visitRuntimeOperation(RuntimeOperation oper) {
-    var e = _runtime.runtimeOperation(oper);
-    e.accept(this);
-    return null;
-  }
-
-  @override
-  Object visitAsExpression(AsExpression node) {
-    _log.severe("Unlowered as expression");
-    assert(false);
-    return null;
-  }
-
-  @override
-  Object visitCompilationUnit(CompilationUnit node) {
-    ScriptTag scriptTag = node.scriptTag;
-    NodeList<Directive> directives = node.directives;
-    safelyVisitNode(scriptTag);
-    String prefix = scriptTag == null ? "" : " ";
-    _visitDirectives(prefix, directives);
-    prefix = scriptTag == null && directives.isEmpty ? "" : " ";
-    visitNodeListWithSeparatorAndPrefix(prefix, node.declarations, " ");
-    return null;
-  }
-
-  @override
-  Object visitPrefixedIdentifier(PrefixedIdentifier id) {
-    safelyVisitNode(id.prefix);
-    output('.');
-    output(id.identifier.token.lexeme);
-    return null;
-  }
-
-  @override
-  Object visitSimpleIdentifier(SimpleIdentifier id) {
-    if (!(_qualifyNames &&
-        _newIdentifiers.containsKey(id) &&
-        _identifierNeedsQualification(id, _newIdentifiers[id]))) {
-      return super.visitSimpleIdentifier(id);
-    }
-    var library = _newIdentifiers[id].importedFrom;
-    if (!utils.isDartPrivateLibrary(library)) {
-      var lib = utils.canonicalLibraryName(library);
-      var libname = canonizeLibraryName(lib);
-      output(libname);
-      output('.');
-    }
-    output(id.name);
-    return null;
-  }
-
-  void generate() {
-    visitCompilationUnit(unit);
-  }
-}
-
-class DartGenerator extends codegenerator.CodeGenerator {
-  final DevCompilerRuntime _runtime = new DevCompilerRuntime();
-
-  DartGenerator(AbstractCompiler compiler) : super(compiler);
-
-  Set<LibraryElement> computeExtraImports(Map<Identifier, NewTypeIdDesc> ids) {
-    var imports = new Set<LibraryElement>();
-    void process(Identifier id, NewTypeIdDesc desc) {
-      if (_identifierNeedsQualification(id, desc)) {
-        var library = desc.importedFrom;
-        if (utils.isDartPrivateLibrary(library)) {
-          _log.severe("Dropping import of private library ${library}\n");
-          return;
-        }
-        imports.add(library);
-      }
-    }
-    ids.forEach(process);
-    return imports;
-  }
-
-  String generateLibrary(LibraryUnit library, LibraryInfo info) {
-    var r = new CoercionReifier(library, compiler, _runtime);
-    var ids = r.reify();
-    var extraImports = computeExtraImports(ids);
-
-    for (var unit in library.partsThenLibrary) {
-      var libraryDir = makeOutputDirectory(info, unit);
-      var uri = unit.element.source.uri;
-      _log.fine("Generating unit $uri");
-      FileWriter out = new FileWriter(
-          options, path.join(libraryDir, '${uri.pathSegments.last}'));
-      var unitGen =
-          new UnitGenerator(unit, out, outDir, extraImports, ids, _runtime);
-      unitGen.generate();
-      out.finalize();
-    }
-
-    return null;
-  }
-}
-
-class EmptyUnitGenerator extends UnitGeneratorCommon {
-  final java_core.PrintWriter _out;
-  CompilationUnit unit;
-
-  EmptyUnitGenerator(this.unit, java_core.PrintWriter out)
-      : _out = out,
-        super(out);
-
-  void output(String s) => _out.print(s);
-  void outputln(String s) => _out.println(s);
-
-  void generate() {
-    unit.visitChildren(this);
-  }
-}
-
-// This class emits the code unchanged, for comparison purposes.
-class EmptyDartGenerator extends codegenerator.CodeGenerator {
-  EmptyDartGenerator(AbstractCompiler compiler) : super(compiler);
-
-  String generateLibrary(LibraryUnit library, LibraryInfo info) {
-    for (var unit in library.partsThenLibrary) {
-      var outputDir = makeOutputDirectory(info, unit);
-      generateUnit(unit, info, outputDir);
-    }
-    return null;
-  }
-
-  void generateUnit(CompilationUnit unit, LibraryInfo info, String libraryDir) {
-    var uri = unit.element.source.uri;
-    _log.fine("Emitting original unit " + uri.toString());
-    FileWriter out = new FileWriter(
-        options, path.join(libraryDir, '${uri.pathSegments.last}'));
-    var unitGen = new EmptyUnitGenerator(unit, out);
-    unitGen.generate();
-    out.finalize();
-  }
-}