commandline/src/CommandLine/Core/InstanceChooser.cs at 5b2b17b56a730a0e806ab9925bc725a8f5deae4e · commandlineparser/commandline · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
// Copyright 2005-2015 Giacomo Stelluti Scala & Contributors. All rights reserved. See License.md in the project root for license information.

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using CSharpx;
using RailwaySharp.ErrorHandling;

namespace CommandLine.Core
{
    static class InstanceChooser
    {
        public static ParserResult<object> Choose(
            Func<IEnumerable<string>, IEnumerable<OptionSpecification>, Result<IEnumerable<Token>, Error>> tokenizer,
            IEnumerable<Type> types,
            IEnumerable<string> arguments,
            StringComparer nameComparer,
            bool ignoreValueCase,
            CultureInfo parsingCulture,
            bool autoHelp,
            bool autoVersion,
            IEnumerable<ErrorType> nonFatalErrors)
        {
            return Choose(
                tokenizer,
                types,
                arguments,
                nameComparer,
                ignoreValueCase,
                parsingCulture,
                autoHelp,
                autoVersion,
                false,
                nonFatalErrors);
        }

        public static ParserResult<object> Choose(
            Func<IEnumerable<string>, IEnumerable<OptionSpecification>, Result<IEnumerable<Token>, Error>> tokenizer,
            IEnumerable<Type> types,
            IEnumerable<string> arguments,
            StringComparer nameComparer,
            bool ignoreValueCase,
            CultureInfo parsingCulture,
            bool autoHelp,
            bool autoVersion,
            bool allowMultiInstance,
            IEnumerable<ErrorType> nonFatalErrors)
        {
            var verbs = Verb.SelectFromTypes(types);
            var defaultVerbs = verbs.Where(t => t.Item1.IsDefault);

            int defaultVerbCount = defaultVerbs.Count();
            if (defaultVerbCount > 1)
                return MakeNotParsed(types, new MultipleDefaultVerbsError());

            var defaultVerb = defaultVerbCount == 1 ? defaultVerbs.First() : null;

            ParserResult<object> choose()
            {
                var firstArg = arguments.First();

                bool preprocCompare(string command) =>
                        nameComparer.Equals(command, firstArg) ||
                        nameComparer.Equals(string.Concat("--", command), firstArg);

                return (autoHelp && preprocCompare("help"))
                    ? MakeNotParsed(types,
                        MakeHelpVerbRequestedError(verbs,
                            arguments.Skip(1).FirstOrDefault() ?? string.Empty, nameComparer))
                    : (autoVersion && preprocCompare("version"))
                        ? MakeNotParsed(types, new VersionRequestedError())
                        : MatchVerb(tokenizer, verbs, defaultVerb, arguments, nameComparer, ignoreValueCase, parsingCulture, autoHelp, autoVersion, allowMultiInstance, nonFatalErrors);
            }

            return arguments.Any()
                ? choose()
                : (defaultVerbCount == 1
                    ? MatchDefaultVerb(tokenizer, verbs, defaultVerb, arguments, nameComparer, ignoreValueCase, parsingCulture, autoHelp, autoVersion, nonFatalErrors)
                    : MakeNotParsed(types, new NoVerbSelectedError()));
        }

        private static ParserResult<object> MatchDefaultVerb(
            Func<IEnumerable<string>, IEnumerable<OptionSpecification>, Result<IEnumerable<Token>, Error>> tokenizer,
            IEnumerable<Tuple<Verb, Type>> verbs,
            Tuple<Verb, Type> defaultVerb,
            IEnumerable<string> arguments,
            StringComparer nameComparer,
            bool ignoreValueCase,
            CultureInfo parsingCulture,
            bool autoHelp,
            bool autoVersion,
            IEnumerable<ErrorType> nonFatalErrors)
        {
            return !(defaultVerb is null)
                ? InstanceBuilder.Build(
                    Maybe.Just<Func<object>>(() => defaultVerb.Item2.AutoDefault()),
                    tokenizer,
                    arguments,
                    nameComparer,
                    ignoreValueCase,
                    parsingCulture,
                    autoHelp,
                    autoVersion,
                    nonFatalErrors)
                : MakeNotParsed(verbs.Select(v => v.Item2), new BadVerbSelectedError(arguments.First()));
        }

        private static ParserResult<object> MatchVerb(
            Func<IEnumerable<string>, IEnumerable<OptionSpecification>, Result<IEnumerable<Token>, Error>> tokenizer,
            IEnumerable<Tuple<Verb, Type>> verbs,
            Tuple<Verb, Type> defaultVerb,
            IEnumerable<string> arguments,
            StringComparer nameComparer,
            bool ignoreValueCase,
            CultureInfo parsingCulture,
            bool autoHelp,
            bool autoVersion,
            bool allowMultiInstance,
            IEnumerable<ErrorType> nonFatalErrors)
        {
            string firstArg = arguments.First();

            var verbUsed = verbs.FirstOrDefault(vt =>
                    nameComparer.Equals(vt.Item1.Name, firstArg)
                    || vt.Item1.Aliases.Any(alias => nameComparer.Equals(alias, firstArg))
            );

            if (verbUsed == default)
            {
                return MatchDefaultVerb(tokenizer, verbs, defaultVerb, arguments, nameComparer, ignoreValueCase, parsingCulture, autoHelp, autoVersion, nonFatalErrors);
            }
            return InstanceBuilder.Build(
                Maybe.Just<Func<object>>(
                    () => verbUsed.Item2.AutoDefault()),
                tokenizer,
                arguments.Skip(1),
                nameComparer,
                ignoreValueCase,
                parsingCulture,
                autoHelp,
                autoVersion,
                allowMultiInstance,
                nonFatalErrors);
        }

        private static HelpVerbRequestedError MakeHelpVerbRequestedError(
            IEnumerable<Tuple<Verb, Type>> verbs,
            string verb,
            StringComparer nameComparer)
        {
            return verb.Length > 0
                ? verbs.SingleOrDefault(v => nameComparer.Equals(v.Item1.Name, verb))
                        .ToMaybe()
                        .MapValueOrDefault(
                            v => new HelpVerbRequestedError(v.Item1.Name, v.Item2, true),
                            new HelpVerbRequestedError(null, null, false))
                : new HelpVerbRequestedError(null, null, false);
        }

        private static NotParsed<object> MakeNotParsed(IEnumerable<Type> types, params Error[] errors)
        {
            return new NotParsed<object>(TypeInfo.Create(typeof(NullInstance), types), errors);
        }
    }
}