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args/lib/src/parser.dart

Index: args/lib/src/parser.dart
diff --git a/args/lib/src/parser.dart b/args/lib/src/parser.dart
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-// Copyright (c) 2013, 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 args.src.parser;
-
-import 'arg_parser.dart';
-import 'arg_results.dart';
-import 'option.dart';
-
-final _SOLO_OPT = new RegExp(r'^-([a-zA-Z0-9])$');
-final _ABBR_OPT = new RegExp(r'^-([a-zA-Z0-9]+)(.*)$');
-final _LONG_OPT = new RegExp(r'^--([a-zA-Z\-_0-9]+)(=(.*))?$');
-
-/// The actual argument parsing class.
-///
-/// Unlike [ArgParser] which is really more an "arg grammar", this is the class
-/// that does the parsing and holds the mutable state required during a parse.
-class Parser {
-  /// If parser is parsing a command's options, this will be the name of the
-  /// command. For top-level results, this returns `null`.
-  final String commandName;
-
-  /// The parser for the supercommand of this command parser, or `null` if this
-  /// is the top-level parser.
-  final Parser parent;
-
-  /// The grammar being parsed.
-  final ArgParser grammar;
-
-  /// The arguments being parsed.
-  final List<String> args;
-
-  /// The remaining non-option, non-command arguments.
-  final rest = <String>[];
-
-  /// The accumulated parsed options.
-  final Map<String, dynamic> results = <String, dynamic>{};
-
-  Parser(this.commandName, this.grammar, this.args, this.parent, rest) {
-    if (rest != null) this.rest.addAll(rest);
-  }
-
-  /// The current argument being parsed.
-  String get current => args[0];
-
-  /// Parses the arguments. This can only be called once.
-  ArgResults parse() {
-    var arguments = args.toList();
-    var commandResults = null;
-
-    // Parse the args.
-    while (args.length > 0) {
-      if (current == '--') {
-        // Reached the argument terminator, so stop here.
-        args.removeAt(0);
-        break;
-      }
-
-      // Try to parse the current argument as a command. This happens before
-      // options so that commands can have option-like names.
-      var command = grammar.commands[current];
-      if (command != null) {
-        validate(rest.isEmpty, 'Cannot specify arguments before a command.');
-        var commandName = args.removeAt(0);
-        var commandParser = new Parser(commandName, command, args, this, rest);
-        commandResults = commandParser.parse();
-
-        // All remaining arguments were passed to command so clear them here.
-        rest.clear();
-        break;
-      }
-
-      // Try to parse the current argument as an option. Note that the order
-      // here matters.
-      if (parseSoloOption()) continue;
-      if (parseAbbreviation(this)) continue;
-      if (parseLongOption()) continue;
-
-      // This argument is neither option nor command, so stop parsing unless
-      // the [allowTrailingOptions] option is set.
-      if (!grammar.allowTrailingOptions) break;
-      rest.add(args.removeAt(0));
-    }
-
-    // Invoke the callbacks.
-    grammar.options.forEach((name, option) {
-      if (option.callback == null) return;
-      option.callback(option.getOrDefault(results[name]));
-    });
-
-    // Add in the leftover arguments we didn't parse to the innermost command.
-    rest.addAll(args);
-    args.clear();
-    return newArgResults(
-        grammar, results, commandName, commandResults, rest, arguments);
-  }
-
-  /// Pulls the value for [option] from the second argument in [args].
-  ///
-  /// Validates that there is a valid value there.
-  void readNextArgAsValue(Option option) {
-    // Take the option argument from the next command line arg.
-    validate(args.length > 0, 'Missing argument for "${option.name}".');
-
-    setOption(results, option, current);
-    args.removeAt(0);
-  }
-
-  /// Tries to parse the current argument as a "solo" option, which is a single
-  /// hyphen followed by a single letter.
-  ///
-  /// We treat this differently than collapsed abbreviations (like "-abc") to
-  /// handle the possible value that may follow it.
-  bool parseSoloOption() {
-    var soloOpt = _SOLO_OPT.firstMatch(current);
-    if (soloOpt == null) return false;
-
-    var option = grammar.findByAbbreviation(soloOpt[1]);
-    if (option == null) {
-      // Walk up to the parent command if possible.
-      validate(
-          parent != null, 'Could not find an option or flag "-${soloOpt[1]}".');
-      return parent.parseSoloOption();
-    }
-
-    args.removeAt(0);
-
-    if (option.isFlag) {
-      setFlag(results, option, true);
-    } else {
-      readNextArgAsValue(option);
-    }
-
-    return true;
-  }
-
-  /// Tries to parse the current argument as a series of collapsed abbreviations
-  /// (like "-abc") or a single abbreviation with the value directly attached
-  /// to it (like "-mrelease").
-  bool parseAbbreviation(Parser innermostCommand) {
-    var abbrOpt = _ABBR_OPT.firstMatch(current);
-    if (abbrOpt == null) return false;
-
-    // If the first character is the abbreviation for a non-flag option, then
-    // the rest is the value.
-    var c = abbrOpt[1].substring(0, 1);
-    var first = grammar.findByAbbreviation(c);
-    if (first == null) {
-      // Walk up to the parent command if possible.
-      validate(
-          parent != null, 'Could not find an option with short name "-$c".');
-      return parent.parseAbbreviation(innermostCommand);
-    } else if (!first.isFlag) {
-      // The first character is a non-flag option, so the rest must be the
-      // value.
-      var value = '${abbrOpt[1].substring(1)}${abbrOpt[2]}';
-      setOption(results, first, value);
-    } else {
-      // If we got some non-flag characters, then it must be a value, but
-      // if we got here, it's a flag, which is wrong.
-      validate(abbrOpt[2] == '',
-          'Option "-$c" is a flag and cannot handle value '
-          '"${abbrOpt[1].substring(1)}${abbrOpt[2]}".');
-
-      // Not an option, so all characters should be flags.
-      // We use "innermostCommand" here so that if a parent command parses the
-      // *first* letter, subcommands can still be found to parse the other
-      // letters.
-      for (var i = 0; i < abbrOpt[1].length; i++) {
-        var c = abbrOpt[1].substring(i, i + 1);
-        innermostCommand.parseShortFlag(c);
-      }
-    }
-
-    args.removeAt(0);
-    return true;
-  }
-
-  void parseShortFlag(String c) {
-    var option = grammar.findByAbbreviation(c);
-    if (option == null) {
-      // Walk up to the parent command if possible.
-      validate(
-          parent != null, 'Could not find an option with short name "-$c".');
-      parent.parseShortFlag(c);
-      return;
-    }
-
-    // In a list of short options, only the first can be a non-flag. If
-    // we get here we've checked that already.
-    validate(
-        option.isFlag, 'Option "-$c" must be a flag to be in a collapsed "-".');
-
-    setFlag(results, option, true);
-  }
-
-  /// Tries to parse the current argument as a long-form named option, which
-  /// may include a value like "--mode=release" or "--mode release".
-  bool parseLongOption() {
-    var longOpt = _LONG_OPT.firstMatch(current);
-    if (longOpt == null) return false;
-
-    var name = longOpt[1];
-    var option = grammar.options[name];
-    if (option != null) {
-      args.removeAt(0);
-      if (option.isFlag) {
-        validate(longOpt[3] == null,
-            'Flag option "$name" should not be given a value.');
-
-        setFlag(results, option, true);
-      } else if (longOpt[3] != null) {
-        // We have a value like --foo=bar.
-        setOption(results, option, longOpt[3]);
-      } else {
-        // Option like --foo, so look for the value as the next arg.
-        readNextArgAsValue(option);
-      }
-    } else if (name.startsWith('no-')) {
-      // See if it's a negated flag.
-      name = name.substring('no-'.length);
-      option = grammar.options[name];
-      if (option == null) {
-        // Walk up to the parent command if possible.
-        validate(parent != null, 'Could not find an option named "$name".');
-        return parent.parseLongOption();
-      }
-
-      args.removeAt(0);
-      validate(option.isFlag, 'Cannot negate non-flag option "$name".');
-      validate(option.negatable, 'Cannot negate option "$name".');
-
-      setFlag(results, option, false);
-    } else {
-      // Walk up to the parent command if possible.
-      validate(parent != null, 'Could not find an option named "$name".');
-      return parent.parseLongOption();
-    }
-
-    return true;
-  }
-
-  /// Called during parsing to validate the arguments.
-  ///
-  /// Throws a [FormatException] if [condition] is `false`.
-  void validate(bool condition, String message) {
-    if (!condition) throw new FormatException(message);
-  }
-
-  /// Validates and stores [value] as the value for [option], which must not be
-  /// a flag.
-  void setOption(Map results, Option option, String value) {
-    assert(!option.isFlag);
-
-    if (!option.isMultiple) {
-      _validateAllowed(option, value);
-      results[option.name] = value;
-      return;
-    }
-
-    var list = results.putIfAbsent(option.name, () => []);
-
-    if (option.splitCommas) {
-      for (var element in value.split(",")) {
-        _validateAllowed(option, element);
-        list.add(element);
-      }
-    } else {
-      _validateAllowed(option, value);
-      list.add(value);
-    }
-  }
-
-  /// Validates and stores [value] as the value for [option], which must be a
-  /// flag.
-  void setFlag(Map results, Option option, bool value) {
-    assert(option.isFlag);
-    results[option.name] = value;
-  }
-
-  /// Validates that [value] is allowed as a value of [option].
-  void _validateAllowed(Option option, String value) {
-    if (option.allowed == null) return;
-
-    validate(option.allowed.contains(value),
-        '"$value" is not an allowed value for option "${option.name}".');
-  }
-}