PasteArguments.cs

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using System.Collections.Generic;
using System.Text;
 
namespace System;
 
internal static class PasteArguments
{
    internal static void AppendArgument(ref ValueStringBuilder stringBuilder, string argument)
    {
        if (stringBuilder.Length != 0)
        {
            stringBuilder.Append(' ');
        }
        if (argument.Length != 0 && ContainsNoWhitespaceOrQuotes(argument))
        {
            stringBuilder.Append(argument);
            return;
        }
        stringBuilder.Append('"');
        int num = 0;
        while (num < argument.Length)
        {
            char c = argument[num++];
            switch (c)
            {
            case '\\':
            {
                int num2 = 1;
                while (num < argument.Length && argument[num] == '\\')
                {
                    num++;
                    num2++;
                }
                if (num == argument.Length)
                {
                    stringBuilder.Append('\\', num2 * 2);
                }
                else if (argument[num] == '"')
                {
                    stringBuilder.Append('\\', num2 * 2 + 1);
                    stringBuilder.Append('"');
                    num++;
                }
                else
                {
                    stringBuilder.Append('\\', num2);
                }
                break;
            }
            case '"':
                stringBuilder.Append('\\');
                stringBuilder.Append('"');
                break;
            default:
                stringBuilder.Append(c);
                break;
            }
        }
        stringBuilder.Append('"');
    }
 
    private static bool ContainsNoWhitespaceOrQuotes(string s)
    {
        foreach (char c in s)
        {
            if (char.IsWhiteSpace(c) || c == '"')
            {
                return false;
            }
        }
        return true;
    }
 
    internal static string Paste(IEnumerable<string> arguments, bool pasteFirstArgumentUsingArgV0Rules)
    {
        Span<char> initialBuffer = stackalloc char[256];
        ValueStringBuilder stringBuilder = new ValueStringBuilder(initialBuffer);
        foreach (string argument in arguments)
        {
            if (pasteFirstArgumentUsingArgV0Rules)
            {
                pasteFirstArgumentUsingArgV0Rules = false;
                bool flag = false;
                string text = argument;
                foreach (char c in text)
                {
                    if (c == '"')
                    {
                        throw new ApplicationException(SR.Argv_IncludeDoubleQuote);
                    }
                    if (char.IsWhiteSpace(c))
                    {
                        flag = true;
                    }
                }
                if (argument.Length == 0 || flag)
                {
                    stringBuilder.Append('"');
                    stringBuilder.Append(argument);
                    stringBuilder.Append('"');
                }
                else
                {
                    stringBuilder.Append(argument);
                }
            }
            else
            {
                AppendArgument(ref stringBuilder, argument);
            }
        }
        return stringBuilder.ToString();
    }
}