/*----------------------------------------------------------

This Source Code Form is subject to the terms of the

Mozilla Public License, v.2.0. If a copy of the MPL

was not distributed with this file, You can obtain one

at http://mozilla.org/MPL/2.0/.

----------------------------------------------------------*/

using System;

using System.Collections.Generic;

using System.Text;

using OneScript.Commons;

using OneScript.Native.Compiler;

using ScriptEngine.Hosting;

namespace ScriptEngine

{

public class OneScriptCoreOptions

{

private const string FILE_READER_ENCODING = "encoding.script";

private const string SYSTEM_LANGUAGE_KEY = "SystemLanguage";

private const string PREPROCESSOR_DEFINITIONS_KEY = "preprocessor.define";

private const string DEFAULT_RUNTIME_KEY = "runtime.default";

private const string EXPLICIT_IMPORT = "lang.explicitImports";

public OneScriptCoreOptions(KeyValueConfig config)

{

SystemLanguage = config[SYSTEM_LANGUAGE_KEY];

FileReaderEncoding = SetupEncoding(config[FILE_READER_ENCODING]);

PreprocessorDefinitions = SetupDefinitions(config[PREPROCESSOR_DEFINITIONS_KEY]);

UseNativeAsDefaultRuntime = SetupDefaultRuntime(config[DEFAULT_RUNTIME_KEY]);

ExplicitImports = SetupExplicitImports(config[EXPLICIT_IMPORT]);

}

public string SystemLanguage { get; }

public Encoding FileReaderEncoding { get; }

public bool UseNativeAsDefaultRuntime { get; }

public IEnumerable<string> PreprocessorDefinitions { get; }

public ExplicitImportsBehavior ExplicitImports { get; }

private static IEnumerable<string> SetupDefinitions(string s)

{

return s?.Split(',') ?? Array.Empty<string>();

}

private static Encoding SetupEncoding(string openerEncoding)

{

if (string.IsNullOrWhiteSpace(openerEncoding))

return Encoding.UTF8;

return StringComparer.InvariantCultureIgnoreCase.Compare(openerEncoding, "default") == 0 ?

FileOpener.SystemSpecificEncoding() :

Encoding.GetEncoding(openerEncoding);

}

private static bool SetupDefaultRuntime(string runtimeId)

{

return runtimeId == NativeRuntimeAnnotationHandler.NativeDirectiveName;

}

private static ExplicitImportsBehavior SetupExplicitImports(string keyValue)

{

switch (keyValue)

{

case "on":

return ExplicitImportsBehavior.Enabled;

case "off":

return ExplicitImportsBehavior.Disabled;

case "warn":

return ExplicitImportsBehavior.Warn;

case "dev":

case null:

return ExplicitImportsBehavior.Development;

default:

SystemLogger.Write($"Unknown value for {EXPLICIT_IMPORT}: {keyValue}");

return ExplicitImportsBehavior.Warn;

}

}

}

}