`analyzer_cli` move to SDK.

pkg/analyzer_cli/lib/src/options.dart

Index: pkg/analyzer_cli/lib/src/options.dart
diff --git a/pkg/analyzer_cli/lib/src/options.dart b/pkg/analyzer_cli/lib/src/options.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ee683e2d084e7eb1a190f6aa8a6ff833fa297fc3
--- /dev/null
+++ b/pkg/analyzer_cli/lib/src/options.dart
@@ -0,0 +1,485 @@
+// 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 analyzer_cli.src.options;
+
+import 'dart:io';
+
+import 'package:analyzer_cli/src/driver.dart';
+import 'package:args/args.dart';
+import 'package:cli_util/cli_util.dart' show getSdkDir;
+
+const _binaryName = 'dartanalyzer';
+
+/// Shared exit handler.
+///
+/// *Visible for testing.*
+ExitHandler exitHandler = exit;
+
+/// Print the given message to stderr and exit with the given [exitCode]
+void printAndFail(String message, {int exitCode: 15}) {
+  errorSink.writeln(message);
+  exitHandler(exitCode);
+}
+
+/// Exit handler.
+///
+/// *Visible for testing.*
+typedef void ExitHandler(int code);
+
+/// Analyzer commandline configuration options.
+class CommandLineOptions {
+  /// The path to an analysis options file
+  final String analysisOptionsFile;
+
+  /// The path to the dart SDK
+  String dartSdkPath;
+
+  /// A table mapping the names of defined variables to their values.
+  final Map<String, String> definedVariables;
+
+  /// Whether to report hints
+  final bool disableHints;
+
+  /// Whether to display version information
+  final bool displayVersion;
+
+  /// Whether to enable null-aware operators (DEP 9).
+  final bool enableNullAwareOperators;
+
+  /// Whether to strictly follow the specification when generating warnings on
+  /// "call" methods (fixes dartbug.com/21938).
+  final bool enableStrictCallChecks;
+
+  /// Whether to relax restrictions on mixins (DEP 34).
+  final bool enableSuperMixins;
+
+  /// Whether to treat type mismatches found during constant evaluation as
+  /// errors.
+  final bool enableTypeChecks;
+
+  /// Whether to treat hints as fatal
+  final bool hintsAreFatal;
+
+  /// Whether to ignore unrecognized flags
+  final bool ignoreUnrecognizedFlags;
+
+  /// Whether to report lints
+  final bool lints;
+
+  /// Whether to log additional analysis messages and exceptions
+  final bool log;
+
+  /// Whether to use machine format for error display
+  final bool machineFormat;
+
+  /// The path to the package root
+  final String packageRootPath;
+
+  /// The path to a `.packages` configuration file
+  final String packageConfigPath;
+
+  /// Batch mode (for unit testing)
+  final bool shouldBatch;
+
+  /// Whether to show package: warnings
+  final bool showPackageWarnings;
+
+  /// Whether to show SDK warnings
+  final bool showSdkWarnings;
+
+  /// The source files to analyze
+  final List<String> sourceFiles;
+
+  /// Whether to treat warnings as fatal
+  final bool warningsAreFatal;
+
+  /// Whether to use strong static checking.
+  final bool strongMode;
+
+  /// Initialize options from the given parsed [args].
+  CommandLineOptions._fromArgs(
+      ArgResults args, Map<String, String> definedVariables)
+      : dartSdkPath = args['dart-sdk'],
+        this.definedVariables = definedVariables,
+        analysisOptionsFile = args['options'],
+        disableHints = args['no-hints'],
+        displayVersion = args['version'],
+        enableNullAwareOperators = args['enable-null-aware-operators'],
+        enableStrictCallChecks = args['enable-strict-call-checks'],
+        enableSuperMixins = args['supermixin'],
+        enableTypeChecks = args['enable_type_checks'],
+        hintsAreFatal = args['fatal-hints'],
+        ignoreUnrecognizedFlags = args['ignore-unrecognized-flags'],
+        lints = args['lints'],
+        log = args['log'],
+        machineFormat = args['machine'] || args['format'] == 'machine',
+        packageConfigPath = args['packages'],
+        packageRootPath = args['package-root'],
+        shouldBatch = args['batch'],
+        showPackageWarnings =
+            args['show-package-warnings'] || args['package-warnings'],
+        showSdkWarnings = args['show-sdk-warnings'] || args['warnings'],
+        sourceFiles = args.rest,
+        warningsAreFatal = args['fatal-warnings'],
+        strongMode = args['strong'];
+
+  /// Parse [args] into [CommandLineOptions] describing the specified
+  /// analyzer options. In case of a format error, calls [printAndFail], which
+  /// by default prints an error message to stderr and exits.
+  static CommandLineOptions parse(List<String> args,
+      [printAndFail = printAndFail]) {
+    CommandLineOptions options = _parse(args);
+    // Check SDK.
+    {
+      // Infer if unspecified.
+      if (options.dartSdkPath == null) {
+        Directory sdkDir = getSdkDir(args);
+        if (sdkDir != null) {
+          options.dartSdkPath = sdkDir.path;
+        }
+      }
+
+      var sdkPath = options.dartSdkPath;
+
+      // Check that SDK is specified.
+      if (sdkPath == null) {
+        printAndFail('No Dart SDK found.');
+      }
+      // Check that SDK is existing directory.
+      if (!(new Directory(sdkPath)).existsSync()) {
+        printAndFail('Invalid Dart SDK path: $sdkPath');
+      }
+    }
+
+    // Check package config.
+    {
+      if (options.packageRootPath != null &&
+          options.packageConfigPath != null) {
+        printAndFail("Cannot specify both '--package-root' and '--packages.");
+      }
+    }
+
+    // OK.  Report deprecated options.
+    if (options.enableNullAwareOperators) {
+      stderr.writeln(
+          "Info: Option '--enable-null-aware-operators' is no longer needed. Null aware operators are supported by default.");
+    }
+
+    return options;
+  }
+
+  static String _getVersion() {
+    try {
+      // This is relative to bin/snapshot, so ../..
+      String versionPath =
+          Platform.script.resolve('../../version').toFilePath();
+      File versionFile = new File(versionPath);
+      return versionFile.readAsStringSync().trim();
+    } catch (_) {
+      // This happens when the script is not running in the context of an SDK.
+      return "<unknown>";
+    }
+  }
+
+  static CommandLineOptions _parse(List<String> args) {
+    args = args.expand((String arg) => arg.split('=')).toList();
+    var parser = new CommandLineParser()
+      ..addFlag('batch',
+          abbr: 'b',
+          help: 'Read commands from standard input (for testing).',
+          defaultsTo: false,
+          negatable: false)
+      ..addOption('dart-sdk', help: 'The path to the Dart SDK.')
+      ..addOption('packages',
+          help:
+              'Path to the package resolution configuration file, which supplies a mapping of package names to paths.  This option cannot be used with --package-root.')
+      ..addOption('package-root',
+          abbr: 'p',
+          help:
+              'Path to a package root directory (deprecated). This option cannot be used with --packages.')
+      ..addOption('options', help: 'Path to an analysis options file.')
+      ..addOption('format',
+          help: 'Specifies the format in which errors are displayed.')
+      ..addFlag('machine',
+          help: 'Print errors in a format suitable for parsing (deprecated).',
+          defaultsTo: false,
+          negatable: false)
+      ..addFlag('version',
+          help: 'Print the analyzer version.',
+          defaultsTo: false,
+          negatable: false)
+      ..addFlag('lints',
+          help: 'Show lint results.', defaultsTo: false, negatable: false)
+      ..addFlag('no-hints',
+          help: 'Do not show hint results.',
+          defaultsTo: false,
+          negatable: false)
+      ..addFlag('ignore-unrecognized-flags',
+          help: 'Ignore unrecognized command line flags.',
+          defaultsTo: false,
+          negatable: false)
+      ..addFlag('fatal-hints',
+          help: 'Treat hints as fatal.', defaultsTo: false, negatable: false)
+      ..addFlag('fatal-warnings',
+          help: 'Treat non-type warnings as fatal.',
+          defaultsTo: false,
+          negatable: false)
+      ..addFlag('package-warnings',
+          help: 'Show warnings from package: imports.',
+          defaultsTo: false,
+          negatable: false)
+      ..addFlag('show-package-warnings',
+          help: 'Show warnings from package: imports (deprecated).',
+          defaultsTo: false,
+          negatable: false)
+      ..addFlag('warnings',
+          help: 'Show warnings from SDK imports.',
+          defaultsTo: false,
+          negatable: false)
+      ..addFlag('show-sdk-warnings',
+          help: 'Show warnings from SDK imports (deprecated).',
+          defaultsTo: false,
+          negatable: false)
+      ..addFlag('help',
+          abbr: 'h',
+          help: 'Display this help message.',
+          defaultsTo: false,
+          negatable: false)
+      ..addOption('url-mapping',
+          help: '--url-mapping=libraryUri,/path/to/library.dart directs the '
+              'analyzer to use "library.dart" as the source for an import '
+              'of "libraryUri".',
+          allowMultiple: true,
+          splitCommas: false)
+      //
+      // Hidden flags.
+      //
+      ..addFlag('enable-async',
+          help: 'Enable support for the proposed async feature.',
+          defaultsTo: false,
+          negatable: false,
+          hide: true)
+      ..addFlag('enable-enum',
+          help: 'Enable support for the proposed enum feature.',
+          defaultsTo: false,
+          negatable: false,
+          hide: true)
+      ..addFlag('enable-null-aware-operators',
+          help: 'Enable support for null-aware operators (DEP 9).',
+          defaultsTo: false,
+          negatable: false,
+          hide: true)
+      ..addFlag('enable-strict-call-checks',
+          help: 'Fix issue 21938.',
+          defaultsTo: false,
+          negatable: false,
+          hide: true)
+      ..addFlag('enable-new-task-model',
+          help: 'Ennable new task model.',
+          defaultsTo: false,
+          negatable: false,
+          hide: true)
+      ..addFlag('supermixin',
+          help: 'Relax restrictions on mixins (DEP 34).',
+          defaultsTo: false,
+          negatable: false,
+          hide: true)
+      ..addFlag('log',
+          help: 'Log additional messages and exceptions.',
+          defaultsTo: false,
+          negatable: false,
+          hide: true)
+      ..addFlag('enable_type_checks',
+          help: 'Check types in constant evaluation.',
+          defaultsTo: false,
+          negatable: false,
+          hide: true)
+      ..addFlag('strong',
+          help: 'Enable strong static checks (https://goo.gl/DqcBsw)');
+
+    try {
+      // TODO(scheglov) https://code.google.com/p/dart/issues/detail?id=11061
+      args =
+          args.map((String arg) => arg == '-batch' ? '--batch' : arg).toList();
+      Map<String, String> definedVariables = <String, String>{};
+      var results = parser.parse(args, definedVariables);
+      // Help requests.
+      if (results['help']) {
+        _showUsage(parser);
+        exit(0);
+      }
+      // Batch mode and input files.
+      if (results['batch']) {
+        if (results.rest.isNotEmpty) {
+          stderr.writeln('No source files expected in the batch mode.');
+          _showUsage(parser);
+          exit(15);
+        }
+      } else if (results['version']) {
+        print('$_binaryName version ${_getVersion()}');
+        exit(0);
+      } else {
+        if (results.rest.isEmpty) {
+          _showUsage(parser);
+          exit(15);
+        }
+      }
+      return new CommandLineOptions._fromArgs(results, definedVariables);
+    } on FormatException catch (e) {
+      stderr.writeln(e.message);
+      _showUsage(parser);
+      exit(15);
+    }
+  }
+
+  static _showUsage(parser) {
+    stderr
+        .writeln('Usage: $_binaryName [options...] <libraries to analyze...>');
+    stderr.writeln(parser.getUsage());
+    stderr.writeln('');
+    stderr.writeln(
+        'For more information, see http://www.dartlang.org/tools/analyzer.');
+  }
+}
+
+/// Commandline argument parser.
+///
+/// TODO(pquitslund): when the args package supports ignoring unrecognized
+/// options/flags, this class can be replaced with a simple [ArgParser]
+/// instance.
+class CommandLineParser {
+  final List<String> _knownFlags;
+  final bool _alwaysIgnoreUnrecognized;
+  final ArgParser _parser;
+
+  /// Creates a new command line parser.
+  CommandLineParser({bool alwaysIgnoreUnrecognized: false})
+      : _knownFlags = <String>[],
+        _alwaysIgnoreUnrecognized = alwaysIgnoreUnrecognized,
+        _parser = new ArgParser(allowTrailingOptions: true);
+
+  ArgParser get parser => _parser;
+
+  /// Defines a flag.
+  /// See [ArgParser.addFlag()].
+  void addFlag(String name,
+      {String abbr,
+      String help,
+      bool defaultsTo: false,
+      bool negatable: true,
+      void callback(bool value),
+      bool hide: false}) {
+    _knownFlags.add(name);
+    _parser.addFlag(name,
+        abbr: abbr,
+        help: help,
+        defaultsTo: defaultsTo,
+        negatable: negatable,
+        callback: callback,
+        hide: hide);
+  }
+
+  /// Defines a value-taking option.
+  /// See [ArgParser.addOption()].
+  void addOption(String name,
+      {String abbr,
+      String help,
+      List<String> allowed,
+      Map<String, String> allowedHelp,
+      String defaultsTo,
+      void callback(value),
+      bool allowMultiple: false,
+      bool splitCommas}) {
+    _knownFlags.add(name);
+    _parser.addOption(name,
+        abbr: abbr,
+        help: help,
+        allowed: allowed,
+        allowedHelp: allowedHelp,
+        defaultsTo: defaultsTo,
+        callback: callback,
+        allowMultiple: allowMultiple,
+        splitCommas: splitCommas);
+  }
+
+  /// Generates a string displaying usage information for the defined options.
+  /// See [ArgParser.usage].
+  String getUsage() => _parser.usage;
+
+  /// Parses [args], a list of command-line arguments, matches them against the
+  /// flags and options defined by this parser, and returns the result. The
+  /// values of any defined variables are captured in the given map.
+  /// See [ArgParser].
+  ArgResults parse(List<String> args, Map<String, String> definedVariables) =>
+      _parser.parse(
+          _filterUnknowns(parseDefinedVariables(args, definedVariables)));
+
+  List<String> parseDefinedVariables(
+      List<String> args, Map<String, String> definedVariables) {
+    int count = args.length;
+    List<String> remainingArgs = <String>[];
+    for (int i = 0; i < count; i++) {
+      String arg = args[i];
+      if (arg == '--') {
+        while (i < count) {
+          remainingArgs.add(args[i++]);
+        }
+      } else if (arg.startsWith("-D")) {
+        definedVariables[arg.substring(2)] = args[++i];
+      } else {
+        remainingArgs.add(arg);
+      }
+    }
+    return remainingArgs;
+  }
+
+  List<String> _filterUnknowns(List<String> args) {
+    // Only filter args if the ignore flag is specified, or if
+    // _alwaysIgnoreUnrecognized was set to true.
+    if (_alwaysIgnoreUnrecognized ||
+        args.contains('--ignore-unrecognized-flags')) {
+      //TODO(pquitslund): replace w/ the following once library skew issues are
+      // sorted out
+      //return args.where((arg) => !arg.startsWith('--') ||
+      //  _knownFlags.contains(arg.substring(2)));
+
+      // Filter all unrecognized flags and options.
+      List<String> filtered = <String>[];
+      for (int i = 0; i < args.length; ++i) {
+        String arg = args[i];
+        if (arg.startsWith('--') && arg.length > 2) {
+          String option = arg.substring(2);
+          // strip the last '=value'
+          int equalsOffset = option.lastIndexOf('=');
+          if (equalsOffset != -1) {
+            option = option.substring(0, equalsOffset);
+          }
+          // Check the option
+          if (!_knownFlags.contains(option)) {
+            //"eat" params by advancing to the next flag/option
+            i = _getNextFlagIndex(args, i);
+          } else {
+            filtered.add(arg);
+          }
+        } else {
+          filtered.add(arg);
+        }
+      }
+
+      return filtered;
+    } else {
+      return args;
+    }
+  }
+
+  int _getNextFlagIndex(args, i) {
+    for (; i < args.length; ++i) {
+      if (args[i].startsWith('--')) {
+        return i;
+      }
+    }
+    return i;
+  }
+}