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BehaviorSelector.cs

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/*----------------------------------------------------------

This Source Code Form is subject to the terms of the

Mozilla Public License, v.2.0. If a copy of the MPL

was not distributed with this file, You can obtain one

at http://mozilla.org/MPL/2.0/.

----------------------------------------------------------*/

using System;

using System.Collections.Generic;

using System.Text;

namespace oscript

{

static class BehaviorSelector

{

public static AppBehavior Select(string[] cmdLineArgs)

{

var helper = new CmdLineHelper(cmdLineArgs);

string arg = helper.Next();

if(arg == null)

return new ShowUsageBehavior();

if (!arg.StartsWith("-"))

{

var path = arg;

return new ExecuteScriptBehavior(path, helper.Tail());

}

var selected = SelectParametrized(helper);

if(selected == null)

selected = new ShowUsageBehavior();

return selected;

}

private static AppBehavior SelectParametrized(CmdLineHelper helper)

{

var initializers = new Dictionary<string, Func<CmdLineHelper, AppBehavior>>();

initializers.Add("-measure", MeasureBehavior.Create);

initializers.Add("-compile", ShowCompiledBehavior.Create);

initializers.Add("-check", CheckSyntaxBehavior.Create);

initializers.Add("-cgi", h => new CgiBehavior());

initializers.Add("-version", h => new ShowVersionBehavior());

initializers.Add("-v", h => new ShowVersionBehavior());

initializers.Add("-encoding", ProcessEncodingKey);

initializers.Add("-codestat", EnableCodeStatistics);

initializers.Add("-debug", DebugBehavior.Create);

var param = helper.Parse(helper.Current());

if(initializers.TryGetValue(param.Name.ToLowerInvariant(), out var action))

{

return action(helper);

}

return null;

}

private static AppBehavior EnableCodeStatistics(CmdLineHelper helper)

{

var param = helper.Parse(helper.Current());

if (string.IsNullOrEmpty(param.Value))

return null;

var outputStatFile = param.Value;

var behavior = Select(helper.Tail());

if (behavior is ExecuteScriptBehavior executor)

executor.CodeStatFile = outputStatFile;

return behavior;

}

private static AppBehavior ProcessEncodingKey(CmdLineHelper helper)

{

var param = helper.Parse(helper.Current());

if (!string.IsNullOrEmpty(param.Value))

{

var encValue = param.Value;

Encoding encoding;

try

{

encoding = Encoding.GetEncoding(encValue);

}

catch

{

Output.WriteLine("Wrong console encoding");

encoding = null;

}

if (encoding != null)

Program.ConsoleOutputEncoding = encoding;

return Select(helper.Tail());

}

return null;

}

}

}