protected override void Go()
{
Goto(0);
for (; ;)
{
#if DEBUG
if (runmatch.Debug)
{
DumpState();
}
#endif
CheckTimeout();
switch (Operator())
{
case RegexCode.Stop:
return;
case RegexCode.Nothing:
break;
case RegexCode.Goto:
Goto(Operand(0));
continue;
case RegexCode.Testref:
if (!IsMatched(Operand(0)))
break;
Advance(1);
continue;
case RegexCode.Lazybranch:
TrackPush(Textpos());
Advance(1);
continue;
case RegexCode.Lazybranch | RegexCode.Back:
TrackPop();
Textto(TrackPeek());
Goto(Operand(0));
continue;
case RegexCode.Setmark:
StackPush(Textpos());
TrackPush();
Advance();
continue;
case RegexCode.Nullmark:
StackPush(-1);
TrackPush();
Advance();
continue;
case RegexCode.Setmark | RegexCode.Back:
case RegexCode.Nullmark | RegexCode.Back:
StackPop();
break;
case RegexCode.Getmark:
StackPop();
TrackPush(StackPeek());
Textto(StackPeek());
Advance();
continue;
case RegexCode.Getmark | RegexCode.Back:
TrackPop();
StackPush(TrackPeek());
break;
case RegexCode.Capturemark:
if (Operand(1) != -1 && !IsMatched(Operand(1)))
break;
StackPop();
if (Operand(1) != -1)
TransferCapture(Operand(0), Operand(1), StackPeek(), Textpos());
else
Capture(Operand(0), StackPeek(), Textpos());
TrackPush(StackPeek());
Advance(2);
continue;
case RegexCode.Capturemark | RegexCode.Back:
TrackPop();
StackPush(TrackPeek());
Uncapture();
if (Operand(0) != -1 && Operand(1) != -1)
Uncapture();
break;
case RegexCode.Branchmark:
{
int matched;
StackPop();
matched = Textpos() - StackPeek();
if (matched != 0)
{ // Nonempty match -> loop now
TrackPush(StackPeek(), Textpos()); // Save old mark, textpos
StackPush(Textpos()); // Make new mark
Goto(Operand(0)); // Loop
}
else
{ // Empty match -> straight now
TrackPush2(StackPeek()); // Save old mark
Advance(1); // Straight
}
continue;
}
case RegexCode.Branchmark | RegexCode.Back:
TrackPop(2);
StackPop();
Textto(TrackPeek(1)); // Recall position
TrackPush2(TrackPeek()); // Save old mark
Advance(1); // Straight
continue;
case RegexCode.Branchmark | RegexCode.Back2:
TrackPop();
StackPush(TrackPeek()); // Recall old mark
break; // Backtrack
case RegexCode.Lazybranchmark:
{
// We hit this the first time through a lazy loop and after each
// successful match of the inner expression. It simply continues
// on and doesn't loop.
StackPop();
int oldMarkPos = StackPeek();
if (Textpos() != oldMarkPos)
{ // Nonempty match -> try to loop again by going to 'back' state
if (oldMarkPos != -1)
TrackPush(oldMarkPos, Textpos()); // Save old mark, textpos
else
TrackPush(Textpos(), Textpos());
}
else
{
// The inner expression found an empty match, so we'll go directly to 'back2' if we
// backtrack. In this case, we need to push something on the stack, since back2 pops.
// However, in the case of ()+? or similar, this empty match may be legitimate, so push the text
// position associated with that empty match.
StackPush(oldMarkPos);
TrackPush2(StackPeek()); // Save old mark
}
Advance(1);
continue;
}
case RegexCode.Lazybranchmark | RegexCode.Back:
{
// After the first time, Lazybranchmark | RegexCode.Back occurs
// with each iteration of the loop, and therefore with every attempted
// match of the inner expression. We'll try to match the inner expression,
// then go back to Lazybranchmark if successful. If the inner expression
// fails, we go to Lazybranchmark | RegexCode.Back2
int pos;
TrackPop(2);
pos = TrackPeek(1);
TrackPush2(TrackPeek()); // Save old mark
StackPush(pos); // Make new mark
Textto(pos); // Recall position
Goto(Operand(0)); // Loop
continue;
}
case RegexCode.Lazybranchmark | RegexCode.Back2:
// The lazy loop has failed. We'll do a true backtrack and
// start over before the lazy loop.
StackPop();
TrackPop();
StackPush(TrackPeek()); // Recall old mark
break;
case RegexCode.Setcount:
StackPush(Textpos(), Operand(0));
TrackPush();
Advance(1);
continue;
case RegexCode.Nullcount:
StackPush(-1, Operand(0));
TrackPush();
Advance(1);
continue;
case RegexCode.Setcount | RegexCode.Back:
StackPop(2);
break;
case RegexCode.Nullcount | RegexCode.Back:
StackPop(2);
break;
case RegexCode.Branchcount:
// StackPush:
// 0: Mark
// 1: Count
{
StackPop(2);
int mark = StackPeek();
int count = StackPeek(1);
int matched = Textpos() - mark;
if (count >= Operand(1) || (matched == 0 && count >= 0))
{ // Max loops or empty match -> straight now
TrackPush2(mark, count); // Save old mark, count
Advance(2); // Straight
}
else
{ // Nonempty match -> count+loop now
TrackPush(mark); // remember mark
StackPush(Textpos(), count + 1); // Make new mark, incr count
Goto(Operand(0)); // Loop
}
continue;
}
case RegexCode.Branchcount | RegexCode.Back:
// TrackPush:
// 0: Previous mark
// StackPush:
// 0: Mark (= current pos, discarded)
// 1: Count
TrackPop();
StackPop(2);
if (StackPeek(1) > 0)
{ // Positive -> can go straight
Textto(StackPeek()); // Zap to mark
TrackPush2(TrackPeek(), StackPeek(1) - 1); // Save old mark, old count
Advance(2); // Straight
continue;
}
StackPush(TrackPeek(), StackPeek(1) - 1); // recall old mark, old count
break;
case RegexCode.Branchcount | RegexCode.Back2:
// TrackPush:
// 0: Previous mark
// 1: Previous count
TrackPop(2);
StackPush(TrackPeek(), TrackPeek(1)); // Recall old mark, old count
break; // Backtrack
case RegexCode.Lazybranchcount:
// StackPush:
// 0: Mark
// 1: Count
{
StackPop(2);
int mark = StackPeek();
int count = StackPeek(1);
if (count < 0)
{ // Negative count -> loop now
TrackPush2(mark); // Save old mark
StackPush(Textpos(), count + 1); // Make new mark, incr count
Goto(Operand(0)); // Loop
}
else
{ // Nonneg count -> straight now
TrackPush(mark, count, Textpos()); // Save mark, count, position
Advance(2); // Straight
}
continue;
}
case RegexCode.Lazybranchcount | RegexCode.Back:
// TrackPush:
// 0: Mark
// 1: Count
// 2: Textpos
{
TrackPop(3);
int mark = TrackPeek();
int textpos = TrackPeek(2);
if (TrackPeek(1) < Operand(1) && textpos != mark)
{ // Under limit and not empty match -> loop
Textto(textpos); // Recall position
StackPush(textpos, TrackPeek(1) + 1); // Make new mark, incr count
TrackPush2(mark); // Save old mark
Goto(Operand(0)); // Loop
continue;
}
else
{ // Max loops or empty match -> backtrack
StackPush(TrackPeek(), TrackPeek(1)); // Recall old mark, count
break; // backtrack
}
}
case RegexCode.Lazybranchcount | RegexCode.Back2:
// TrackPush:
// 0: Previous mark
// StackPush:
// 0: Mark (== current pos, discarded)
// 1: Count
TrackPop();
StackPop(2);
StackPush(TrackPeek(), StackPeek(1) - 1); // Recall old mark, count
break; // Backtrack
case RegexCode.Setjump:
StackPush(Trackpos(), Crawlpos());
TrackPush();
Advance();
continue;
case RegexCode.Setjump | RegexCode.Back:
StackPop(2);
break;
case RegexCode.Backjump:
// StackPush:
// 0: Saved trackpos
// 1: Crawlpos
StackPop(2);
Trackto(StackPeek());
while (Crawlpos() != StackPeek(1))
Uncapture();
break;
case RegexCode.Forejump:
// StackPush:
// 0: Saved trackpos
// 1: Crawlpos
StackPop(2);
Trackto(StackPeek());
TrackPush(StackPeek(1));
Advance();
continue;
case RegexCode.Forejump | RegexCode.Back:
// TrackPush:
// 0: Crawlpos
TrackPop();
while (Crawlpos() != TrackPeek())
Uncapture();
break;
case RegexCode.Bol:
if (Leftchars() > 0 && CharAt(Textpos() - 1) != '\n')
break;
Advance();
continue;
case RegexCode.Eol:
if (Rightchars() > 0 && CharAt(Textpos()) != '\n')
break;
Advance();
continue;
case RegexCode.Boundary:
if (!IsBoundary(Textpos(), runtextbeg, runtextend))
break;
Advance();
continue;
case RegexCode.Nonboundary:
if (IsBoundary(Textpos(), runtextbeg, runtextend))
break;
Advance();
continue;
case RegexCode.ECMABoundary:
if (!IsECMABoundary(Textpos(), runtextbeg, runtextend))
break;
Advance();
continue;
case RegexCode.NonECMABoundary:
if (IsECMABoundary(Textpos(), runtextbeg, runtextend))
break;
Advance();
continue;
case RegexCode.Beginning:
if (Leftchars() > 0)
break;
Advance();
continue;
case RegexCode.Start:
if (Textpos() != Textstart())
break;
Advance();
continue;
case RegexCode.EndZ:
if (Rightchars() > 1 || Rightchars() == 1 && CharAt(Textpos()) != '\n')
break;
Advance();
continue;
case RegexCode.End:
if (Rightchars() > 0)
break;
Advance();
continue;
case RegexCode.One:
if (Forwardchars() < 1 || Forwardcharnext() != (char)Operand(0))
break;
Advance(1);
continue;
case RegexCode.Notone:
if (Forwardchars() < 1 || Forwardcharnext() == (char)Operand(0))
break;
Advance(1);
continue;
case RegexCode.Set:
if (Forwardchars() < 1 || !RegexCharClass.CharInClass(Forwardcharnext(), _code._strings[Operand(0)]))
break;
Advance(1);
continue;
case RegexCode.Multi:
{
if (!Stringmatch(_code._strings[Operand(0)]))
break;
Advance(1);
continue;
}
case RegexCode.Ref:
{
int capnum = Operand(0);
if (IsMatched(capnum))
{
if (!Refmatch(MatchIndex(capnum), MatchLength(capnum)))
break;
}
else
{
if ((runregex.roptions & RegexOptions.ECMAScript) == 0)
break;
}
Advance(1);
continue;
}
case RegexCode.Onerep:
{
int c = Operand(1);
if (Forwardchars() < c)
break;
char ch = (char)Operand(0);
while (c-- > 0)
if (Forwardcharnext() != ch)
goto BreakBackward;
Advance(2);
continue;
}
case RegexCode.Notonerep:
{
int c = Operand(1);
if (Forwardchars() < c)
break;
char ch = (char)Operand(0);
while (c-- > 0)
if (Forwardcharnext() == ch)
goto BreakBackward;
Advance(2);
continue;
}
case RegexCode.Setrep:
{
int c = Operand(1);
if (Forwardchars() < c)
break;
string set = _code._strings[Operand(0)];
while (c-- > 0)
if (!RegexCharClass.CharInClass(Forwardcharnext(), set))
goto BreakBackward;
Advance(2);
continue;
}
case RegexCode.Oneloop:
{
int c = Operand(1);
if (c > Forwardchars())
c = Forwardchars();
char ch = (char)Operand(0);
int i;
for (i = c; i > 0; i--)
{
if (Forwardcharnext() != ch)
{
Backwardnext();
break;
}
}
if (c > i)
TrackPush(c - i - 1, Textpos() - Bump());
Advance(2);
continue;
}
case RegexCode.Notoneloop:
{
int c = Operand(1);
if (c > Forwardchars())
c = Forwardchars();
char ch = (char)Operand(0);
int i;
for (i = c; i > 0; i--)
{
if (Forwardcharnext() == ch)
{
Backwardnext();
break;
}
}
if (c > i)
TrackPush(c - i - 1, Textpos() - Bump());
Advance(2);
continue;
}
case RegexCode.Setloop:
{
int c = Operand(1);
if (c > Forwardchars())
c = Forwardchars();
string set = _code._strings[Operand(0)];
int i;
for (i = c; i > 0; i--)
{
if (!RegexCharClass.CharInClass(Forwardcharnext(), set))
{
Backwardnext();
break;
}
}
if (c > i)
TrackPush(c - i - 1, Textpos() - Bump());
Advance(2);
continue;
}
case RegexCode.Oneloop | RegexCode.Back:
case RegexCode.Notoneloop | RegexCode.Back:
{
TrackPop(2);
int i = TrackPeek();
int pos = TrackPeek(1);
Textto(pos);
if (i > 0)
TrackPush(i - 1, pos - Bump());
Advance(2);
continue;
}
case RegexCode.Setloop | RegexCode.Back:
{
TrackPop(2);
int i = TrackPeek();
int pos = TrackPeek(1);
Textto(pos);
if (i > 0)
TrackPush(i - 1, pos - Bump());
Advance(2);
continue;
}
case RegexCode.Onelazy:
case RegexCode.Notonelazy:
{
int c = Operand(1);
if (c > Forwardchars())
c = Forwardchars();
if (c > 0)
TrackPush(c - 1, Textpos());
Advance(2);
continue;
}
case RegexCode.Setlazy:
{
int c = Operand(1);
if (c > Forwardchars())
c = Forwardchars();
if (c > 0)
TrackPush(c - 1, Textpos());
Advance(2);
continue;
}
case RegexCode.Onelazy | RegexCode.Back:
{
TrackPop(2);
int pos = TrackPeek(1);
Textto(pos);
if (Forwardcharnext() != (char)Operand(0))
break;
int i = TrackPeek();
if (i > 0)
TrackPush(i - 1, pos + Bump());
Advance(2);
continue;
}
case RegexCode.Notonelazy | RegexCode.Back:
{
TrackPop(2);
int pos = TrackPeek(1);
Textto(pos);
if (Forwardcharnext() == (char)Operand(0))
break;
int i = TrackPeek();
if (i > 0)
TrackPush(i - 1, pos + Bump());
Advance(2);
continue;
}
case RegexCode.Setlazy | RegexCode.Back:
{
TrackPop(2);
int pos = TrackPeek(1);
Textto(pos);
if (!RegexCharClass.CharInClass(Forwardcharnext(), _code._strings[Operand(0)]))
break;
int i = TrackPeek();
if (i > 0)
TrackPush(i - 1, pos + Bump());
Advance(2);
continue;
}
default:
throw NotImplemented.ByDesignWithMessage(SR.UnimplementedState);
}
BreakBackward:
;
// "break Backward" comes here:
Backtrack();
}
}
