/*
* Find code cache based on options+pattern
*/
static CachedCodeEntry LookupCachedAndUpdate(CachedCodeEntryKey key)
{
s_cacheLock.EnterReadLock();
if (s_cache.TryGetValue(key, out CachedCodeEntry entry))
{
entry._usedstamp = s_recentstamp;
}
s_cacheLock.ExitReadLock();
//
return(entry);
}
/*
* Add current code to the cache
*/
private void CacheCode(CachedCodeEntryKey key)
{
var newcached = new CachedCodeEntry(capnames, capslist, _code, caps, capsize, _runnerref, _replref)
{
_usedstamp = s_recentstamp++,
};
s_cacheLock.EnterWriteLock();
s_cache[key] = newcached;
s_cacheLock.ExitWriteLock();
if (s_cache.Count > s_cacheSize)
{
DropEntryFromCache();
}
}
private Regex(string pattern, RegexOptions options, TimeSpan matchTimeout, bool useCache)
{
// validate parameters:
if (pattern == null)
{
throw new ArgumentNullException(nameof(pattern));
}
if (options < RegexOptions.None || (((int)options) >> MaxOptionShift) != 0)
{
throw new ArgumentOutOfRangeException(nameof(options));
}
if ((options & RegexOptions.ECMAScript) != 0 &&
(options & ~(RegexOptions.ECMAScript |
RegexOptions.IgnoreCase |
RegexOptions.Multiline |
RegexOptions.CultureInvariant
#if DEBUG
| RegexOptions.Debug
#endif
)) != 0)
{
throw new ArgumentOutOfRangeException(nameof(options));
}
ValidateMatchTimeout(matchTimeout);
this.pattern = pattern;
this.roptions = options;
// Try to look up this regex in the cache. We do this regardless of whether useCache is true since there's
// really no reason not to.
var key = new CachedCodeEntryKey(options, pattern);
var cached = LookupCachedAndUpdate(key);
internalMatchTimeout = matchTimeout;
if (cached == null)
{
// Parse the input
var tree = RegexParser.Parse(pattern, roptions);
// Extract the relevant information
capnames = tree.CapNames;
capslist = tree.CapsList;
_code = RegexWriter.Write(tree);
caps = _code._caps;
capsize = _code._capsize;
InitializeReferences();
if (useCache)
{
CacheCode(key);
}
}
else
{
caps = cached._caps;
capnames = cached._capnames;
capslist = cached._capslist;
capsize = cached._capsize;
_code = cached._code;
_runnerref = cached._runnerref;
_replref = cached._replref;
_refsInitialized = true;
}
}