/// <summary>
/// Attempts to locate cached function list for the package
/// </summary>
/// <returns></returns>
private IEnumerable <IPersistentFunctionInfo> TryRestoreFromCache()
{
var filePath = this.CacheFilePath;
try {
if (_fs.FileExists(filePath))
{
var list = new List <IPersistentFunctionInfo>();
using (var file = new FileStream(filePath, FileMode.Open, FileAccess.Read)) {
using (var sr = new StreamReader(file)) {
var s = sr.ReadLine();
if (!s.EqualsOrdinal(VersionString))
{
return(null); // incompatible
}
while (!sr.EndOfStream)
{
s = sr.ReadLine().Trim();
if (!PersistentFunctionInfo.TryParse(s, out IPersistentFunctionInfo info))
{
return(null);
}
list.Add(info);
}
}
}
return(list);
}
} catch (IOException) { } catch (UnauthorizedAccessException) { }
return(null);
}
public static bool TryParse(string s, out IPersistentFunctionInfo info)
{
info = null;
var start = s.IndexOf('`');
var end = s.LastIndexOf('`');
if (start < 0 || end < 0 || start >= end)
{
return(false);
}
if (!bool.TryParse(s.Substring(end + 1), out bool isInternal))
{
return(false);
}
info = new PersistentFunctionInfo(s.Substring(start + 1, end - start - 1), isInternal);
return(true);
}