/MSBuild/Microsoft/Build/Shared/QuotingUtilities.cs

namespace Microsoft.Build.Shared

{

    using System;

    using System.Collections;

    using System.Runtime.InteropServices;

    using System.Text;



    internal static class QuotingUtilities

    {

        private static readonly char[] splitMarker = new char[1];



        internal static ArrayList SplitUnquoted(string input, params char[] separator)

        {

            int num;

            return SplitUnquoted(input, 0x7fffffff, false, false, out num, separator);

        }



        internal static ArrayList SplitUnquoted(string input, int maxSplits, bool keepEmptySplits, bool unquote, out int emptySplits, params char[] separator)

        {

            Microsoft.Build.Shared.ErrorUtilities.VerifyThrow(maxSplits >= 2, "There is no point calling this method for less than two splits.");

            string str = new StringBuilder().Append(separator).ToString();

            Microsoft.Build.Shared.ErrorUtilities.VerifyThrow(str.IndexOf('"') == -1, "The double-quote character is not supported as a separator.");

            StringBuilder builder = new StringBuilder();

            builder.EnsureCapacity(input.Length);

            bool flag = false;

            int num = 0;

            int num2 = 1;

            for (int i = 0; (i < input.Length) && (num2 < maxSplits); i++)

            {

                char ch = input[i];

                if (ch != '\0')

                {

                    if (ch != '"')

                    {

                        if (ch != '\\')

                        {

                            goto Label_00CD;

                        }

                        builder.Append('\\');

                        num++;

                    }

                    else

                    {

                        builder.Append('"');

                        if ((num % 2) == 0)

                        {

                            if ((flag && (i < (input.Length - 1))) && (input[i + 1] == '"'))

                            {

                                builder.Append('"');

                                i++;

                            }

                            flag = !flag;

                        }

                        num = 0;

                    }

                }

                continue;

            Label_00CD:

                if (!flag && (((str.Length == 0) && char.IsWhiteSpace(input[i])) || (str.IndexOf(input[i]) != -1)))

                {

                    builder.Append('\0');

                    if (++num2 == maxSplits)

                    {

                        builder.Append(input, i + 1, input.Length - (i + 1));

                    }

                }

                else

                {

                    builder.Append(input[i]);

                }

                num = 0;

            }

            ArrayList list = new ArrayList();

            emptySplits = 0;

            foreach (string str2 in builder.ToString().Split(splitMarker, maxSplits))

            {

                string str3 = unquote ? Unquote(str2) : str2;

                if ((str3.Length > 0) || keepEmptySplits)

                {

                    list.Add(str3);

                }

                else

                {

                    emptySplits++;

                }

            }

            return list;

        }



        internal static string Unquote(string input)

        {

            int num;

            return Unquote(input, out num);

        }



        internal static string Unquote(string input, out int doubleQuotesRemoved)

        {

            StringBuilder builder = new StringBuilder();

            builder.EnsureCapacity(input.Length);

            bool flag = false;

            int repeatCount = 0;

            doubleQuotesRemoved = 0;

            for (int i = 0; i < input.Length; i++)

            {

                char ch = input[i];

                if (ch != '"')

                {

                    if (ch != '\\')

                    {

                        goto Label_008F;

                    }

                    repeatCount++;

                }

                else

                {

                    builder.Append('\\', repeatCount / 2);

                    if ((repeatCount % 2) == 0)

                    {

                        if ((flag && (i < (input.Length - 1))) && (input[i + 1] == '"'))

                        {

                            builder.Append('"');

                            i++;

                        }

                        flag = !flag;

                        doubleQuotesRemoved++;

                    }

                    else

                    {

                        builder.Append('"');

                    }

                    repeatCount = 0;

                }

                continue;

            Label_008F:

                builder.Append('\\', repeatCount);

                builder.Append(input[i]);

                repeatCount = 0;

            }

            return builder.Append('\\', repeatCount).ToString();

        }

    }

}