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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Text;
namespace System
{
internal static partial class PasteArguments
{
internal static void AppendArgument(StringBuilder stringBuilder, string argument)
{
if (stringBuilder.Length != 0)
{
stringBuilder.Append(' ');
}
// Parsing rules for non-argv[0] arguments:
// - Backslash is a normal character except followed by a quote.
// - 2N backslashes followed by a quote ==> N literal backslashes followed by unescaped quote
// - 2N+1 backslashes followed by a quote ==> N literal backslashes followed by a literal quote
// - Parsing stops at first whitespace outside of quoted region.
// - (post 2008 rule): A closing quote followed by another quote ==> literal quote, and parsing remains in quoting mode.
if (argument.Length != 0 && ContainsNoWhitespaceOrQuotes(argument))
{
// Simple case - no quoting or changes needed.
stringBuilder.Append(argument);
}
else
{
stringBuilder.Append(Quote);
int idx = 0;
while (idx < argument.Length)
{
char c = argument[idx++];
if (c == Backslash)
{
int numBackSlash = 1;
while (idx < argument.Length && argument[idx] == Backslash)
{
idx++;
numBackSlash++;
}
if (idx == argument.Length)
{
// We'll emit an end quote after this so must double the number of backslashes.
stringBuilder.Append(Backslash, numBackSlash * 2);
}
else if (argument[idx] == Quote)
{
// Backslashes will be followed by a quote. Must double the number of backslashes.
stringBuilder.Append(Backslash, numBackSlash * 2 + 1);
stringBuilder.Append(Quote);
idx++;
}
else
{
// Backslash will not be followed by a quote, so emit as normal characters.
stringBuilder.Append(Backslash, numBackSlash);
}
continue;
}
if (c == Quote)
{
// Escape the quote so it appears as a literal. This also guarantees that we won't end up generating a closing quote followed
// by another quote (which parses differently pre-2008 vs. post-2008.)
stringBuilder.Append(Backslash);
stringBuilder.Append(Quote);
continue;
}
stringBuilder.Append(c);
}
stringBuilder.Append(Quote);
}
}
private static bool ContainsNoWhitespaceOrQuotes(string s)
{
for (int i = 0; i < s.Length; i++)
{
char c = s[i];
if (char.IsWhiteSpace(c) || c == Quote)
{
return false;
}
}
return true;
}
private const char Quote = '\"';
private const char Backslash = '\\';
}
}
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