/// <summary>
/// Given a Match, emits into the StringBuilder the evaluated
/// substitution pattern.
/// </summary>
private void ReplacementImpl(StringBuilder sb, Match match)
{
for (int i = 0; i < _rules.Count; i++)
{
int r = _rules[i];
if (r >= 0) // string lookup
sb.Append(_strings[r]);
else if (r < -Specials) // group lookup
sb.Append(match.GroupToStringImpl(-Specials - 1 - r));
else
{
switch (-Specials - 1 - r)
{ // special insertion patterns
case LeftPortion:
sb.Append(match.GetLeftSubstring());
break;
case RightPortion:
sb.Append(match.GetRightSubstring());
break;
case LastGroup:
sb.Append(match.LastGroupToStringImpl());
break;
case WholeString:
sb.Append(match.GetOriginalString());
break;
}
}
}
}
/// <summary>
/// Returns the replacement result for a single match
/// </summary>
internal string Replacement(Match match)
{
var sb = new StringBuilder();
ReplacementImpl(sb, match);
return sb.ToString();
}
/// <summary>
/// Given a Match, emits into the List{string} the evaluated
/// Right-to-Left substitution pattern.
/// </summary>
private void ReplacementImplRTL(List<string> al, Match match)
{
for (int i = _rules.Count - 1; i >= 0; i--)
{
int r = _rules[i];
if (r >= 0) // string lookup
al.Add(_strings[r]);
else if (r < -Specials) // group lookup
al.Add(match.GroupToStringImpl(-Specials - 1 - r));
else
{
switch (-Specials - 1 - r)
{ // special insertion patterns
case LeftPortion:
al.Add(match.GetLeftSubstring());
break;
case RightPortion:
al.Add(match.GetRightSubstring());
break;
case LastGroup:
al.Add(match.LastGroupToStringImpl());
break;
case WholeString:
al.Add(match.GetOriginalString());
break;
}
}
}
}
/// <summary>
/// Put match in its canonical form before returning it.
/// </summary>
private Match TidyMatch(bool quick)
{
if (!quick)
{
Match match = runmatch;
runmatch = null;
match.Tidy(runtextpos);
return match;
}
else
{
// in quick mode, a successful match returns null, and
// the allocated match object is left in the cache
return null;
}
}
/// <summary>
/// Initializes all the data members that are used by Go()
/// </summary>
private void InitMatch()
{
// Use a hashtable'ed Match object if the capture numbers are sparse
if (runmatch == null)
{
if (runregex.caps != null)
runmatch = new MatchSparse(runregex, runregex.caps, runregex.capsize, runtext, runtextbeg, runtextend - runtextbeg, runtextstart);
else
runmatch = new Match(runregex, runregex.capsize, runtext, runtextbeg, runtextend - runtextbeg, runtextstart);
}
else
{
runmatch.Reset(runregex, runtext, runtextbeg, runtextend, runtextstart);
}
// note we test runcrawl, because it is the last one to be allocated
// If there is an alloc failure in the middle of the three allocations,
// we may still return to reuse this instance, and we want to behave
// as if the allocations didn't occur. (we used to test _trackcount != 0)
if (runcrawl != null)
{
runtrackpos = runtrack.Length;
runstackpos = runstack.Length;
runcrawlpos = runcrawl.Length;
return;
}
InitTrackCount();
int tracksize = runtrackcount * 8;
int stacksize = runtrackcount * 8;
if (tracksize < 32)
tracksize = 32;
if (stacksize < 16)
stacksize = 16;
runtrack = new int[tracksize];
runtrackpos = tracksize;
runstack = new int[stacksize];
runstackpos = stacksize;
runcrawl = new int[32];
runcrawlpos = 32;
}
/*
* Convert to a thread-safe object by precomputing cache contents
*/
/// <summary>
/// Returns a Match instance equivalent to the one supplied that is safe to share
/// between multiple threads.
/// </summary>
public static Match Synchronized(Match inner)
{
if (inner == null)
throw new ArgumentNullException(nameof(inner));
int numgroups = inner._matchcount.Length;
// Populate all groups by looking at each one
for (int i = 0; i < numgroups; i++)
{
Group group = inner.Groups[i];
// Depends on the fact that Group.Synchronized just
// operates on and returns the same instance
Group.Synchronized(group);
}
return inner;
}
