using System;

using System.Collections.Generic;

using System.Globalization;

using System.Numerics;

namespace Semmle.Util

{

public class EnvironmentVariables

{

public static string? GetExtractorOption(string name) =>

Environment.GetEnvironmentVariable($"CODEQL_EXTRACTOR_CSHARP_OPTION_{name.ToUpper()}");

public static T? TryGetExtractorNumberOption<T>(string name) where T : struct, INumberBase<T>

{

var value = GetExtractorOption(name);

if (T.TryParse(value, NumberStyles.Number, CultureInfo.InvariantCulture, out var result))

{

return result;

}

return null;

}

public static int GetDefaultNumberOfThreads()

{

if (!int.TryParse(Environment.GetEnvironmentVariable("CODEQL_THREADS"), out var threads) || threads == -1)

{

threads = Environment.ProcessorCount;

}

return threads;

}

public static bool GetBooleanOptOut(string name)

{

var env = Environment.GetEnvironmentVariable(name);

if (env == null ||

bool.TryParse(env, out var value) &&

value)

{

return true;

}

return false;

}

public static bool GetBoolean(string name)

{

var env = Environment.GetEnvironmentVariable(name);

_ = bool.TryParse(env, out var value);

return value;

}

public static IEnumerable<string> GetURLs(string name)

{

return Environment.GetEnvironmentVariable(name)?.Split(" ", StringSplitOptions.RemoveEmptyEntries) ?? [];

}

/// <summary>

/// Used to

/// (1) Detect whether the extractor should run in overlay mode.

/// (2) Returns the path to the file containing a list of changed files

/// in JSON format.

///

/// The environment variable is only set in case the extraction is supposed to be

/// performed in overlay mode. Furthermore, this only applies to buildless extraction.

/// </summary>

public static string? GetOverlayChangesFilePath()

{

return Environment.GetEnvironmentVariable("CODEQL_EXTRACTOR_CSHARP_OVERLAY_CHANGES");

}

/// <summary>

/// If the environment variable is set, the extractor is being called to extract a base database.

/// Its value will be a path, and the extractor must create either a file or directory at that location.

/// </summary>

public static string? GetBaseMetaDataOutPath()

{

return Environment.GetEnvironmentVariable("CODEQL_EXTRACTOR_CSHARP_OVERLAY_BASE_METADATA_OUT");

}

/// <summary>

/// If set, returns the directory where buildless dependencies should be stored.

/// This can be used for caching dependencies.

/// </summary>

public static string? GetBuildlessDependencyDir()

{

return Environment.GetEnvironmentVariable("CODEQL_EXTRACTOR_CSHARP_OPTION_BUILDLESS_DEPENDENCY_DIR");

}

}

}