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// Licensed under the MIT License.
using System.Globalization;
using System.Management.Automation.Internal;
using System.Management.Automation.Language;
using System.Management.Automation.Runspaces;
// ReSharper disable UnusedMember.Global
namespace System.Management.Automation
{
using Dbg = Diagnostics;
internal static class StringOps
{
internal static string Add(string lhs, string rhs)
{
return string.Concat(lhs, rhs);
}
internal static string Add(string lhs, char rhs)
{
return string.Concat(lhs, rhs);
}
internal static string Multiply(string s, int times)
{
Diagnostics.Assert(s != null, "caller to verify argument is not null");
// TODO: this should be a runtime error.
ArgumentOutOfRangeException.ThrowIfNegative(times);
if (times == 0 || s.Length == 0)
{
return string.Empty;
}
var context = LocalPipeline.GetExecutionContextFromTLS();
if (context != null &&
context.LanguageMode == PSLanguageMode.RestrictedLanguage && (s.Length * times) > 1024)
{
throw InterpreterError.NewInterpreterException(times, typeof(RuntimeException),
null, "StringMultiplyToolongInDataSection", ParserStrings.StringMultiplyToolongInDataSection, 1024);
}
if (s.Length == 1)
{
// A string of length 1 has special support in the BCL, so just use it.
return new string(s[0], times);
}
return string.Create(s.Length * times, (s, times), (dst, args) =>
{
ReadOnlySpan<char> src = args.s.AsSpan();
int length = src.Length;
for (int i = 0; i < args.times; i++)
{
src.CopyTo(dst);
dst = dst.Slice(length);
}
});
}
internal static string FormatOperator(string formatString, object formatArgs)
{
try
{
object[] formatArgsArray = formatArgs as object[];
return formatArgsArray != null
? StringUtil.Format(formatString, formatArgsArray)
: StringUtil.Format(formatString, formatArgs);
}
catch (FormatException sfe)
{
// "error formatting a string: " + sfe.Message
throw InterpreterError.NewInterpreterException(formatString, typeof(RuntimeException),
PositionUtilities.EmptyExtent, "FormatError", ParserStrings.FormatError, sfe.Message);
}
}
// The following methods are used for the compatibility purpose between regular PowerShell and PowerShell on CSS
/// <summary>
/// StringComparison.InvariantCulture is not in CoreCLR, so we need to use
/// CultureInfo.InvariantCulture.CompareInfo.Compare(string, string, CompareOptions)
/// to substitute
/// string.Compare(string, string, StringComparison)
/// </summary>
internal static int Compare(string strA, string strB, CultureInfo culture, CompareOptions option)
{
Diagnostics.Assert(culture != null, "Caller makes sure that 'culture' is not null.");
return culture.CompareInfo.Compare(strA, strB, option);
}
/// <summary>
/// StringComparison.InvariantCulture is not in CoreCLR, so we need to use
/// CultureInfo.InvariantCulture.CompareInfo.Compare(string, string, CompareOptions) == 0
/// to substitute
/// string.Equals(string, string, StringComparison)
/// </summary>
internal static bool Equals(string strA, string strB, CultureInfo culture, CompareOptions option)
{
Diagnostics.Assert(culture != null, "Caller makes sure that 'culture' is not null.");
return culture.CompareInfo.Compare(strA, strB, option) == 0;
}
}
}
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