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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Medallion.Shell

{

/// <summary>

/// Mono on unix uses a different, incompatible method of splitting the command line into arguments

/// than is the default on Windows. This is referenced here: https://bugzilla.xamarin.com/show_bug.cgi?id=19296,

/// although the "quick fix" it mentions does not fully account for the differences.

/// </summary>

internal sealed class MonoUnixCommandLineSyntax : CommandLineSyntax

{

// On unix, it seems that Mono calls g_shell_parse_argv:

// https://github.com/mono/mono/blob/e8c660ce90efc7966ffc6fa9753ac237b2afadf2/mono/metadata/w32process-unix.c#L2174

// follow that to here:

// https://github.com/mono/mono/blob/e8c660ce90efc7966ffc6fa9753ac237b2afadf2/mono/metadata/w32process-unix.c#L1638

// calls g_shell_parse_argv here:

// https://github.com/mono/mono/blob/e8c660ce90efc7966ffc6fa9753ac237b2afadf2/mono/metadata/w32process-unix.c#L1786

// defined here: https://github.com/mono/mono/blob/c114ff59d96baba4479361b2679b7de602517877/mono/eglib/gshell.c

public override string CreateArgumentString(IEnumerable<string> arguments) => CreateArgumentString(arguments, AppendArgument);

private static void AppendArgument(string argument, StringBuilder builder)

{

// this method reverse-engineers the code Mono uses to split the command line.

// A C# port of Mono's split method can be seen in the tests

if (argument.Length > 0

&& !argument.Any(IsSpecialCharacter))

{

builder.Append(argument);

return;

}

builder.Append('"');

for (var i = 0; i < argument.Length; ++i)

{

var @char = argument[i];

switch (@char)

{

case '$':

case '`':

case '"':

case '\\':

builder.Append('\\');

break;

}

builder.Append(@char);

}

builder.Append('"');

}

private static bool IsSpecialCharacter(char @char)

{

switch (@char)

{

case '\\':

case '\'':

case '"':

return true;

default:

return char.IsWhiteSpace(@char);

}

}

}

}