Update charted to 0.4.8 and roll

packages/petitparser/example/lispshell/lispshell.dart

-library petitparser.example.lispshell;
-
-import 'dart:io';
-import 'dart:async';
-import 'dart:convert';
-
-import 'package:petitparser/petitparser.dart';
-import 'package:petitparser/lisp.dart';
-
-/// Read, evaluate, print loop.
-void evalInteractive(Parser parser, Environment env, Stream<String> input,
-    IOSink output, IOSink error) {
-  output.write('>> ');
-  input.listen((String line) {
-    try {
-      output.writeln('=> ${evalString(parser, env, line)}');
-    } on ParserError catch (exception) {
-      error.writeln('Parser error: ' + exception.toString());
-    } on Error catch (exception) {
-      error.writeln(exception.toString());
-    }
-    output.write('>> ');
-  });
-}
-
-/// Entry point for the command line interpreter.
-void main(List<String> arguments) {
-
-  // default options
-  var standardLibrary = true;
-  var interactiveMode = false;
-  var files = new List();
-
-  // parse arguments
-  for (var option in arguments) {
-    if (option.startsWith('-') && files.isEmpty) {
-      if (option == '-n') {
-        standardLibrary = false;
-      } else if (option == '-i') {
-        interactiveMode = true;
-      } else if (option == '-?') {
-        print('${Platform.executable} lisp.dart -n -i [files]');
-        print(' -i enforces the interactive mode');
-        print(' -n does not load the standard library');
-        exit(0);
-      } else {
-        print('Unknown option: $option');
-        exit(1);
-      }
-    } else {
-      var file = new File(option);
-      if (file.existsSync()) {
-        files.add(file);
-      } else {
-        print('File not found: $option');
-        exit(2);
-      }
-    }
-  }
-
-  // evaluation context
-  var environment = Natives.import(new Environment());
-
-  // add additional primitives
-  environment.define(new Name('exit'), (env, args) => exit(args == null ? 0 : args.head));
-  environment.define(new Name('sleep'), (env, args) => sleep(new Duration(milliseconds: args.head)));
-
-  // process standard library
-  if (standardLibrary) {
-    environment = Standard.import(environment.create());
-  }
-
-  // create empty context
-  environment = environment.create();
-
-  // process files given as argument
-  files.forEach((file) {
-    evalString(lispParser, environment, file.readAsStringSync());
-  });
-
-  // process console input
-  if (interactiveMode || files.isEmpty) {
-    var input = stdin
-        .transform(SYSTEM_ENCODING.decoder)
-        .transform(new LineSplitter());
-    evalInteractive(lispParser, environment, input, stdout, stderr);
-  }
-}