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

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.Text;

using System.IO;

namespace ScriptEngine.Environment

{

class StringBasedSource : ICodeSource

{

readonly string _src;

public StringBasedSource(string src)

{

_src = src;

}

#region ICodeSource Members

string ICodeSource.Code

{

get

{

return _src;

}

}

string ICodeSource.SourceDescription => $"<string {_src.GetHashCode().ToString("X8")}>" ;

#endregion

}

class FileBasedSource : ICodeSource

{

readonly string _path;

string _code;

readonly Encoding _noBomEncoding;

public FileBasedSource(string path, Encoding defaultEncoding)

{

_path = System.IO.Path.GetFullPath(path);

_noBomEncoding = defaultEncoding;

}

private string GetCodeString()

{

if (_code == null)

{

using (var fStream = new FileStream(_path, FileMode.Open, FileAccess.Read))

{

var buf = new byte[2];

fStream.Read(buf, 0, 2);

Encoding enc = null;

bool skipShebang = false;

if (IsLinuxScript(buf))

{

enc = Encoding.UTF8; // скрипты с shebang считать в формате UTF-8

skipShebang = true;

}

else

{

fStream.Position = 0;

enc = FileOpener.AssumeEncoding(fStream, _noBomEncoding);

}

using (var reader = new StreamReader(fStream, enc))

{

if (skipShebang)

reader.ReadLine();

_code = reader.ReadToEnd();

}

}

}

return _code;

}

private static bool IsLinuxScript(byte[] buf)

{

return buf[0] == '#' && buf[1] == '!';

}

#region ICodeSource Members

string ICodeSource.Code

{

get

{

return GetCodeString();

}

}

string ICodeSource.SourceDescription

{

get { return _path[0].ToString().ToUpperInvariant() + _path.Substring(1); }

}

#endregion

}

}