/*
* Add current code to the cache
*/
private CachedCodeEntry CacheCode(CachedCodeEntryKey key)
{
CachedCodeEntry newcached = null;
lock (s_livecode)
{
// first look for it in the cache and move it to the head
for (LinkedListNode <CachedCodeEntry> current = s_livecode.First; current != null; current = current.Next)
{
if (current.Value._key == key)
{
s_livecode.Remove(current);
s_livecode.AddFirst(current);
return(current.Value);
}
}
// it wasn't in the cache, so we'll add a new one. Shortcut out for the case where cacheSize is zero.
if (s_cacheSize != 0)
{
newcached = new CachedCodeEntry(key, capnames, capslist, _code, caps, capsize, _runnerref, _replref);
s_livecode.AddFirst(newcached);
if (s_livecode.Count > s_cacheSize)
{
s_livecode.RemoveLast();
}
}
}
return(newcached);
}
internal CachedCodeEntry(CachedCodeEntryKey key, Hashtable capnames, string[] capslist, RegexCode code, Hashtable caps, int capsize, ExclusiveReference runner, SharedReference repl)
{
_key = key;
_capnames = capnames;
_capslist = capslist;
_code = code;
_caps = caps;
_capsize = capsize;
_runnerref = runner;
_replref = repl;
}
/*
* Find code cache based on options+pattern
*/
private static CachedCodeEntry LookupCachedAndUpdate(CachedCodeEntryKey key)
{
lock (s_livecode)
{
for (LinkedListNode <CachedCodeEntry> current = s_livecode.First; current != null; current = current.Next)
{
if (current.Value._key == key)
{
// If we find an entry in the cache, move it to the head at the same time.
s_livecode.Remove(current);
s_livecode.AddFirst(current);
return(current.Value);
}
}
}
return(null);
}
private Regex(string pattern, RegexOptions options, TimeSpan matchTimeout, bool useCache)
{
RegexTree tree;
CachedCodeEntry cached = null;
string cultureKey = null;
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.Compiled |
RegexOptions.CultureInvariant
#if DEBUG
| RegexOptions.Debug
#endif
)) != 0)
{
throw new ArgumentOutOfRangeException(nameof(options));
}
ValidateMatchTimeout(matchTimeout);
// 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.
if ((options & RegexOptions.CultureInvariant) != 0)
{
cultureKey = CultureInfo.InvariantCulture.ToString(); // "English (United States)"
}
else
{
cultureKey = CultureInfo.CurrentCulture.ToString();
}
var key = new CachedCodeEntryKey(options, cultureKey, pattern);
cached = LookupCachedAndUpdate(key);
this.pattern = pattern;
roptions = options;
internalMatchTimeout = matchTimeout;
if (cached == null)
{
// Parse the input
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();
tree = null;
if (useCache)
{
cached = 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;
}
// if the compile option is set, then compile the code if it's not already
if (UseOptionC() && factory == null)
{
factory = RegexCompiler.Compile(_code, roptions);
if (useCache && cached != null)
{
cached.AddCompiled(factory);
}
_code = null;
}
}