/// <summary>
/// This is the only function that should be called from outside.
/// It takes a RegexTree and creates a corresponding RegexCode.
/// </summary>
internal static RegexCode Write(RegexTree t)
{
RegexWriter w = new RegexWriter();
RegexCode retval = w.RegexCodeFromRegexTree(t);
#if DEBUG
if (t.Debug)
{
t.Dump();
retval.Dump();
}
#endif
return(retval);
}
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;
}
}