SearchEntry top; //stack entry
#endregion Fields
#region Constructors
internal Matcher(Pattern regex)
{
this.re=regex;
int memregCount, counterCount, lookaheadCount;
if((memregCount=regex.memregs)>0) {
MemReg[] memregs = new MemReg[memregCount];
for(int i=0;i<memregCount;i++){
memregs[i]=new MemReg(-1); //unlikely to SearchEntry, in this case we know memreg indicies by definition
}
this.memregs=memregs;
}
if((counterCount=regex.counters)>0) counters = new int[counterCount];
if((lookaheadCount=regex.lookaheads)>0) {
LAEntry[] lookaheads=new LAEntry[lookaheadCount];
for(int i=0;i<lookaheadCount;i++){
lookaheads[i] = new LAEntry();
}
this.lookaheads = lookaheads;
}
first = new SearchEntry();
defaultEntry = new SearchEntry();
minQueueLength = regex.stringRepr.Length/2; // just evaluation!!!
}
private bool Search(int anchors)
{
called=true;
int end=this.end;
int offset=this.offset;
char[] data=this.data;
int wOffset=this.wOffset;
int wEnd=this.wEnd;
MemReg[] memregs=this.memregs;
int[] counters=this.counters;
LAEntry[] lookaheads=this.lookaheads;
SearchEntry defaultEntry=this.defaultEntry;
SearchEntry first=this.first;
SearchEntry top=this.top;
SearchEntry actual=null;
int cnt,regLen;
int i;
bool matchEnd=(anchors&ANCHOR_END)>0;
bool allowIncomplete=(anchors&ACCEPT_INCOMPLETE)>0;
Pattern re=this.re;
Term root=re.root;
Term term;
if(top==null) {
if((anchors&ANCHOR_START)>0) {
term=re.root0; //raw root
root=startAnchor;
} else if((anchors&ANCHOR_LASTMATCH)>0) {
term=re.root0; //raw root
root=lastMatchAnchor;
} else {
term=root; //optimized root
}
i=wOffset;
actual=first;
SearchEntry.PopState(defaultEntry,memregs,counters);
} else {
top=(actual=top).sub;
term=actual.term;
i=actual.index;
SearchEntry.PopState(actual,memregs,counters);
}
cnt=actual.cnt;
regLen=actual.regLen;
while(wOffset<=end){
matchHere:
for(;;){
int memreg,cntreg;
char c;
switch(term.type){
case Term.TermType.FIND:{
int jump=Find(data,i+term.distance,end,term.target); //don't eat the last match
if(jump<0) goto breakMain; //return false
i+=jump;
wOffset=i; //force window to move
if(term.eat){
if(i==end) break;
i++;
}
term=term.next;
goto matchHere;
}
case Term.TermType.FINDREG:{
MemReg mr=memregs[term.target.memreg];
int sampleOff=mr._in;
int sampleLen=mr._out-sampleOff;
if(sampleOff<0 || sampleLen<0) {
break;
} else if (sampleLen==0) {
term=term.next;
goto matchHere;
}
int jump=FindReg(data,i+term.distance,sampleOff,sampleLen,term.target,end); //don't eat the last match
if(jump<0) goto breakMain; //return false
i+=jump;
wOffset=i; //force window to move
if(term.eat) {
i+=sampleLen;
if(i>end) break;
}
term=term.next;
goto matchHere;
}
case Term.TermType.VOID:
term=term.next;
goto matchHere;
case Term.TermType.CHAR:
if(i>=end || data[i]!=term.c) break;
i++;
term=term.next;
goto matchHere;
case Term.TermType.ANY_CHAR:
if(i>=end) break;
i++;
term=term.next;
goto matchHere;
case Term.TermType.ANY_CHAR_NE:
if(i>=end || data[i]=='\n') break;
i++;
term=term.next;
goto matchHere;
case Term.TermType.END:
if(i>=end) { //meets
term=term.next;
goto matchHere;
}
break;
case Term.TermType.END_EOL: //perl's $
if(i>=end) { //meets
term=term.next;
goto matchHere;
} else {
bool matches=
i>=end |
((i+1)==end && data[i]=='\n');
if(matches) {
term=term.next;
goto matchHere;
} else break;
}
case Term.TermType.LINE_END:
if(i>=end) { //meets
term=term.next;
goto matchHere;
} else {
if(data[i]=='\n'){
term=term.next;
goto matchHere;
}
}
break;
case Term.TermType.START: //Perl's "^"
if(i==offset) { //meets
term=term.next;
goto matchHere;
}
if(top!=null) break;
if(term!=startAnchor) break;
else goto breakMain;
case Term.TermType.LAST_MATCH_END:
if(i==wEnd || wEnd == -1) { //meets
term=term.next;
goto matchHere;
}
goto breakMain; //return false
case Term.TermType.LINE_START:
if(i==offset) { //meets
term=term.next;
goto matchHere;
} else if(i<end) {
if((c=data[i-1])=='\n') {
term=term.next;
goto matchHere;
}
}
break;
case Term.TermType.BITSET:{
if(i>=end) break;
c=data[i];
if(!(c<=255 && term.bitset[c])^term.inverse) break;
i++;
term=term.next;
goto matchHere;
}
case Term.TermType.BITSET2:{
if(i>=end) break;
c=data[i];
bool[] arr=term.bitset2[c>>8];
if(arr==null || !arr[c&255]^term.inverse) break;
i++;
term=term.next;
goto matchHere;
}
case Term.TermType.BOUNDARY:{
bool ch1Meets=false,ch2Meets=false;
bool[] bitset=term.bitset;
{
int j=i-1;
if(j<offset) goto test1;
c = data[j];
ch1Meets= (c<256 && bitset[c]);
}
test1:
{
if(i>=end) goto test2;
c = data[i];
ch2Meets = (c<256 && bitset[c]);
}
test2:
if(ch1Meets^ch2Meets^term.inverse) { //meets
term=term.next;
goto matchHere;
} else break;
}
case Term.TermType.UBOUNDARY:{
bool ch1Meets=false,ch2Meets=false;
bool[][] bitset2=term.bitset2;
{
int j=i-1;
if(j<offset) goto test1;
c= data[j];
bool[] bits=bitset2[c>>8];
ch1Meets= bits!=null && bits[c&0xff];
}
test1:
{
if(i>=end) goto test2;
c= data[i];
bool[] bits=bitset2[c>>8];
ch2Meets= bits!=null && bits[c&0xff];
}
test2:
if(ch1Meets^ch2Meets^term.inverse){ //is boundary ^ inv
term=term.next;
goto matchHere;
}
else break;
}
case Term.TermType.DIRECTION:{
bool ch1Meets=false,ch2Meets=false;
bool[] bitset=term.bitset;
bool inv=term.inverse;
int j=i-1;
if(j>=offset){
c = data[j];
ch1Meets = c<256 && bitset[c];
}
if(ch1Meets^inv) break;
if(i<end){
c = data[i];
ch2Meets= c<256 && bitset[c];
}
if(!ch2Meets^inv) break;
term=term.next;
goto matchHere;
}
case Term.TermType.UDIRECTION:{
bool ch1Meets=false,ch2Meets=false;
bool[][] bitset2=term.bitset2;
bool inv=term.inverse;
int j=i-1;
if(j>=offset) {
c = data[j];
bool[] bits=bitset2[c>>8];
ch1Meets= bits!=null && bits[c&0xff];
}
if(ch1Meets^inv) break;
if(i<end) {
c= data[i];
bool[] bits=bitset2[c>>8];
ch2Meets= bits!=null && bits[c&0xff];
}
if(!ch2Meets^inv) break;
term=term.next;
goto matchHere;
}
case Term.TermType.REG:{
MemReg mr=memregs[term.memreg];
int sampleOffset=mr._in;
int sampleOutside=mr._out;
int rLen;
if(sampleOffset<0 || (rLen=sampleOutside-sampleOffset)<0) {
break;
} else if(rLen==0) {
term=term.next;
goto matchHere;
}
if((i+rLen)>end) break;
if(CompareRegions(data,sampleOffset,i,rLen,end)){
i+=rLen;
term=term.next;
goto matchHere;
}
break;
}
case Term.TermType.REG_I:{
MemReg mr=memregs[term.memreg];
int sampleOffset=mr._in;
int sampleOutside=mr._out;
int rLen;
if(sampleOffset<0 || (rLen=sampleOutside-sampleOffset)<0){
break;
} else if(rLen==0) {
term=term.next;
goto matchHere;
}
if((i+rLen)>end) break;
if(CompareRegionsI(data,sampleOffset,i,rLen,end)) {
i+=rLen;
term=term.next;
goto matchHere;
}
break;
}
case Term.TermType.REPEAT_0_INF:{
if((cnt=Repeat(data,i,end,term.target))<=0){
term=term.next;
continue;
}
i+=cnt;
actual.cnt=cnt;
actual.term=term.failNext;
actual.index=i;
actual=(top=actual).on;
if(actual==null){
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
}
case Term.TermType.REPEAT_MIN_INF:{
cnt=Repeat(data,i,end,term.target);
if(cnt<term.minCount) break;
i+=cnt;
actual.cnt=cnt;
actual.term=term.failNext;
actual.index=i;
actual=(top=actual).on;
if(actual==null){
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
}
case Term.TermType.REPEAT_MIN_MAX:{
int out1=end;
int out2=i+term.maxCount;
cnt=Repeat(data,i,out1<out2? out1: out2,term.target);
if(cnt<term.minCount) break;
i+=cnt;
actual.cnt=cnt;
actual.term=term.failNext;
actual.index=i;
actual=(top=actual).on;
if(actual==null) {
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
}
case Term.TermType.REPEAT_REG_MIN_INF:{
MemReg mr=memregs[term.memreg];
int sampleOffset=mr._in;
int sampleOutside=mr._out;
int bitset;
if(sampleOffset<0 || (bitset=sampleOutside-sampleOffset)<0) {
break;
} else if(bitset==0) {
term=term.next;
goto matchHere;
}
cnt=0;
while(CompareRegions(data,i,sampleOffset,bitset,end)){
cnt++;
i+=bitset;
}
if(cnt<term.minCount) break;
actual.cnt=cnt;
actual.term=term.failNext;
actual.index=i;
actual.regLen=bitset;
actual=(top=actual).on;
if(actual==null){
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
}
case Term.TermType.REPEAT_REG_MIN_MAX:{
MemReg mr=memregs[term.memreg];
int sampleOffset=mr._in;
int sampleOutside=mr._out;
int bitset;
if(sampleOffset<0 || (bitset=sampleOutside-sampleOffset)<0){
break;
} else if(bitset==0) {
term=term.next;
goto matchHere;
}
cnt=0;
int countBack=term.maxCount;
while(countBack>0 && CompareRegions(data,i,sampleOffset,bitset,end)){
cnt++;
i+=bitset;
countBack--;
}
if(cnt<term.minCount) break;
actual.cnt=cnt;
actual.term=term.failNext;
actual.index=i;
actual.regLen=bitset;
actual=(top=actual).on;
if(actual==null) {
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
}
case Term.TermType.BACKTRACK_0:
cnt=actual.cnt;
if(cnt>0){
cnt--;
i--;
actual.cnt=cnt;
actual.index=i;
actual.term=term;
actual=(top=actual).on;
if(actual==null) {
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
}
else break;
case Term.TermType.BACKTRACK_MIN:
cnt=actual.cnt;
if(cnt>term.minCount) {
cnt--;
i--;
actual.cnt=cnt;
actual.index=i;
actual.term=term;
actual=(top=actual).on;
if(actual==null){
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
}
else break;
case Term.TermType.BACKTRACK_FIND_MIN:{
cnt=actual.cnt;
int minCnt;
if(cnt>(minCnt=term.minCount)) {
int start=i+term.distance;
if(start>end){
int exceed=start-end;
cnt-=exceed;
if(cnt<=minCnt) break;
i-=exceed;
start=end;
}
int back=FindBack(data,i+term.distance,cnt-minCnt,term.target);
if(back<0) break;
if((cnt-=back)<=minCnt) {
i-=back;
if(term.eat)i++;
term=term.next;
continue;
}
i-=back;
actual.cnt=cnt;
actual.index=i;
if(term.eat)i++;
actual.term=term;
actual=(top=actual).on;
if(actual==null) {
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
}
else break;
}
case Term.TermType.BACKTRACK_FINDREG_MIN:{
cnt=actual.cnt;
int minCnt;
if(cnt>(minCnt=term.minCount)){
int start=i+term.distance;
if(start>end) {
int exceed=start-end;
cnt-=exceed;
if(cnt<=minCnt) break;
i-=exceed;
start=end;
}
MemReg mr=memregs[term.target.memreg];
int sampleOff=mr._in;
int sampleLen=mr._out-sampleOff;
int back;
if(sampleOff<0 || sampleLen<0) {
cnt--;
i--;
actual.cnt=cnt;
actual.index=i;
actual.term=term;
actual=(top=actual).on;
if(actual==null) {
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
} else if(sampleLen==0) {
back=1;
} else {
back=FindBackReg(data,i+term.distance,sampleOff,sampleLen,cnt-minCnt,term.target,end);
if(back<0) break;
}
cnt-=back;
i-=back;
actual.cnt=cnt;
actual.index=i;
if(term.eat)i+=sampleLen;
actual.term=term;
actual=(top=actual).on;
if(actual==null){
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
}
else break;
}
case Term.TermType.BACKTRACK_REG_MIN:
cnt=actual.cnt;
if(cnt>term.minCount) {
regLen=actual.regLen;
cnt--;
i-=regLen;
actual.cnt=cnt;
actual.index=i;
actual.term=term;
actual=(top=actual).on;
if(actual==null){
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
}
else break;
case Term.TermType.GROUP_IN:{
memreg=term.memreg;
if(memreg>0) {
memregs[memreg].tmp=i; //assume
}
term=term.next;
continue;
}
case Term.TermType.GROUP_OUT:
memreg=term.memreg;
if(memreg>0){
MemReg mr=memregs[memreg];
SearchEntry.SaveMemregState((top!=null)? top: defaultEntry,memreg,mr);
mr._in=mr.tmp; //commit
mr._out=i;
}
term=term.next;
continue;
case Term.TermType.PLOOKBEHIND_IN:{
int tmp=i-term.distance;
if(tmp<offset) break;
LAEntry le=lookaheads[term.lookaheadId];
le.index=i;
i=tmp;
le.actual=actual;
le.top=top;
term=term.next;
continue;
}
case Term.TermType.INDEPENDENT_IN:
case Term.TermType.PLOOKAHEAD_IN:{
LAEntry le=lookaheads[term.lookaheadId];
le.index=i;
le.actual=actual;
le.top=top;
term=term.next;
continue;
}
case Term.TermType.LOOKBEHIND_CONDITION_OUT:
case Term.TermType.LOOKAHEAD_CONDITION_OUT:
case Term.TermType.PLOOKAHEAD_OUT:
case Term.TermType.PLOOKBEHIND_OUT:{
LAEntry le=lookaheads[term.lookaheadId];
i=le.index;
actual=le.actual;
top=le.top;
term=term.next;
continue;
}
case Term.TermType.INDEPENDENT_OUT:{
LAEntry le=lookaheads[term.lookaheadId];
actual=le.actual;
top=le.top;
term=term.next;
continue;
}
case Term.TermType.NLOOKBEHIND_IN:{
int tmp=i-term.distance;
if(tmp<offset) {
term=term.failNext;
continue;
}
LAEntry le=lookaheads[term.lookaheadId];
le.actual=actual;
le.top=top;
actual.term=term.failNext;
actual.index=i;
i=tmp;
actual=(top=actual).on;
if(actual==null){
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
}
case Term.TermType.NLOOKAHEAD_IN:{
LAEntry le=lookaheads[term.lookaheadId];
le.actual=actual;
le.top=top;
actual.term=term.failNext;
actual.index=i;
actual=(top=actual).on;
if(actual==null) {
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
}
case Term.TermType.NLOOKBEHIND_OUT:
case Term.TermType.NLOOKAHEAD_OUT:{
LAEntry le=lookaheads[term.lookaheadId];
actual=le.actual;
top=le.top;
break;
}
case Term.TermType.LOOKBEHIND_CONDITION_IN:{
int tmp=i-term.distance;
if(tmp<offset){
term=term.failNext;
continue;
}
LAEntry le=lookaheads[term.lookaheadId];
le.index=i;
le.actual=actual;
le.top=top;
actual.term=term.failNext;
actual.index=i;
actual=(top=actual).on;
if(actual==null) {
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
i=tmp;
term=term.next;
continue;
}
case Term.TermType.LOOKAHEAD_CONDITION_IN:{
LAEntry le=lookaheads[term.lookaheadId];
le.index=i;
le.actual=actual;
le.top=top;
actual.term=term.failNext;
actual.index=i;
actual=(top=actual).on;
if(actual==null) {
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
}
case Term.TermType.MEMREG_CONDITION:{
MemReg mr=memregs[term.memreg];
int sampleOffset=mr._in;
int sampleOutside=mr._out;
if(sampleOffset>=0 && sampleOutside>=0 && sampleOutside>=sampleOffset){
term=term.next;
} else {
term=term.failNext;
}
continue;
}
case Term.TermType.BRANCH_STORE_CNT_AUX1:
actual.regLen=regLen;
goto case Term.TermType.BRANCH_STORE_CNT;
case Term.TermType.BRANCH_STORE_CNT:
actual.cnt=cnt;
goto case Term.TermType.BRANCH;
case Term.TermType.BRANCH:
actual.term=term.failNext;
actual.index=i;
actual=(top=actual).on;
if(actual==null) {
actual=new SearchEntry();
top.on=actual;
actual.sub=top;
}
term=term.next;
continue;
case Term.TermType.SUCCESS:
if(!matchEnd || i==end) {
this.wOffset=memregs[0]._in=wOffset;
this.wEnd=memregs[0]._out=i;
this.top=top;
return true;
} else break;
case Term.TermType.CNT_SET_0:
cnt=0;
term=term.next;
continue;
case Term.TermType.CNT_INC:
cnt++;
term=term.next;
continue;
case Term.TermType.CNT_GT_EQ:
if(cnt>=term.maxCount) {
term=term.next;
continue;
}
else break;
case Term.TermType.READ_CNT_LT:
cnt=actual.cnt;
if(cnt<term.maxCount) {
term=term.next;
continue;
}
else break;
case Term.TermType.CRSTORE_CRINC:{
int cntvalue=counters[cntreg=term.cntreg];
SearchEntry.SaveCntState((top!=null)? top: defaultEntry,cntreg,cntvalue);
counters[cntreg]=++cntvalue;
term=term.next;
continue;
}
case Term.TermType.CR_SET_0:
counters[term.cntreg]=0;
term=term.next;
continue;
case Term.TermType.CR_LT:
if(counters[term.cntreg]<term.maxCount) {
term=term.next;
continue;
} else break;
case Term.TermType.CR_GT_EQ:
if(counters[term.cntreg]>=term.maxCount) {
term=term.next;
continue;
} else break;
default:
throw new System.Exception("unknown term type: "+term.type);
}
if(allowIncomplete && i==end) {
return true;
}
if(top==null) {
goto breakMatchHere;
}
top=(actual=top).sub;
term=actual.term;
i=actual.index;
if(actual.isState) {
SearchEntry.PopState(actual,memregs,counters);
}
}
breakMatchHere:
if(defaultEntry.isState) SearchEntry.PopState(defaultEntry,memregs,counters);
term=root;
i=++wOffset;
}
breakMain:
this.wOffset=wOffset;
this.top=top;
return false;
}
private void Flush()
{
top=null;
defaultEntry.Reset(0);
first.Reset(minQueueLength);
for(int i=memregs.Length-1;i>0;i--){
MemReg mr=memregs[i];
mr._in=mr._out=-1;
}
for(int i=memregs.Length-1;i>0;i--){
MemReg mr=memregs[i];
mr._in=mr._out=-1;
}
called=false;
}
internal static void SaveMemregState(SearchEntry entry, int memreg, MemReg mr)
{
entry.isState=true;
MState current=entry.mCurrent;
if(current==null) {
MState head=entry.mHead;
if(head==null) entry.mHead=entry.mCurrent=current=new MState();
else current=head;
} else {
MState next=current.next;
if(next==null){
current.next=next=new MState();
next.prev=current;
}
current=next;
}
current.index=memreg;
current._in=mr._in;
current._out=mr._out;
entry.mCurrent=current;
}
internal static void SaveCntState(SearchEntry entry, int cntreg, int value)
{
entry.isState=true;
CState current=entry.cCurrent;
if(current==null) {
CState head=entry.cHead;
if(head==null) entry.cHead=entry.cCurrent=current=new CState();
else current=head;
} else {
CState next=current.next;
if(next==null) {
current.next=next=new CState();
next.prev=current;
}
current=next;
}
current.index=cntreg;
current.value=value;
entry.cCurrent=current;
}
internal static void PopState(SearchEntry entry, MemReg[] memregs, int[] counters)
{
MState ms=entry.mCurrent;
while(ms!=null){
MemReg mr=memregs[ms.index];
mr._in=ms._in;
mr._out=ms._out;
ms=ms.prev;
}
CState cs=entry.cCurrent;
while(cs!=null) {
counters[cs.index]=cs.value;
cs=cs.prev;
}
entry.mCurrent=null;
entry.cCurrent=null;
entry.isState=false;
}