[u/mrichter/AliRoot.git] / STEER / AliExpression.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

///////////////////////////////////////////////////////////////////////////////
//                                                                           //
//  AliExpression Class                                                      //                                                                           //
//                                                                           //
//  Helper class to evaluate the condition expressions in                    //
//  AliTriggerCondition                                                      //
//  Implements a simple recursive-descent parser                             //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////

//#include <Riostream.h>
#include <TString.h>
#include <TObjString.h>
#include <TObjArray.h>

#include "AliLog.h"
#include "AliExpression.h"
#include "AliTriggerInput.h"

ClassImp( AliExpression )

//______________________________________________________________________________
AliExpression::AliExpression( TString exp )
{
   // Default constructor
   TObjArray* tokens = Tokenize( exp );

   Int_t i = -1;
   AliExpression* e = Expression( *tokens, i );
   // Copy !!!
   fArg1 = e->fArg1; e->fArg1 = 0;
   fArg2 = e->fArg2; e->fArg2 = 0;
   fOperator = e->fOperator;
   fVname = e->fVname;
   delete e;
   delete tokens;
}

//______________________________________________________________________________
AliExpression::~AliExpression()
{
   if( fArg1 ) delete fArg1;
   if( fArg2 ) delete fArg2;
}

//______________________________________________________________________________
AliExpression& AliExpression::operator=(const AliExpression& e)
{
   // AliExpression assignment operator.

   if( this != &e ) {
      TObject::operator=(e);
      fArg1 = e.fArg1;
      fArg2 = e.fArg2;
      fOperator = e.fOperator;
      fVname = e.fVname;
   }
   return *this;
}

//______________________________________________________________________________
AliExpression::AliExpression( int op, AliExpression* a, AliExpression* b )
{
   // Create a new expression
   fArg1 = a;
   fArg2 = b;
   fOperator = op;
}

//______________________________________________________________________________
AliExpression::AliExpression( int op, AliExpression* a )
{
   // Create a unary expression.
   fArg1 = 0;
   fArg2 = a;
   fOperator = op;
}

//______________________________________________________________________________
Bool_t AliExpression::Value( TObjArray &vars )
{
   //  Evaluate the expression
   if ( fArg2 == 0 && fVname.IsNull() ) {
       AliError( "Expression undefined." );
       return kFALSE;
   }

   switch (fOperator) {

      case kOpOR :
          return fArg1->Value(vars) || fArg2->Value(vars);

      case kOpAND :
          return fArg1->Value(vars) && fArg2->Value(vars);

      case kOpNOT :
          return !(fArg2->Value(vars));

      case 0 :
	{
          TObject* dd = vars.FindObject( fVname.Data() );
          if( dd == NULL ) {
             AliError( fVname + " is undefined" );
             return 0;
          }
          return ((AliTriggerInput*)dd)->GetValue();
	}

      default:
          AliError( "Illegal operator in expression!");

   }
   return kFALSE;
}


//______________________________________________________________________________
TString AliExpression::Unparse() const
{
   // Unparse the expression

   TString opVals[4] = { "", "&", "|","!" };
   if ( fArg2 == 0 && fVname.IsNull() ) {
      AliError( "Expression undefined." );
      return "Error";
   }

   if( fArg2 == 0 && !fVname.IsNull() ) return fVname;

   if (fArg1 == 0 && fArg2) {
      return opVals[fOperator]+fArg2->Unparse();
   }
   return "("+fArg1->Unparse()+" "+opVals[fOperator]+" "+fArg2->Unparse()+")";
}

//______________________________________________________________________________
TObjArray* AliExpression::Tokenize( TString str ) const
{
   // tokenize the expression

   // Remove spaces
   TString str1;
   for( Int_t i=0; i<str.Length(); i++ ) {
      if( str[i] == ' ' ) continue;
      str1.Append( str[i] );
   }
   // get variable tokens
   TObjArray* valtok = str1.Tokenize( "!&|()" );
   // put all variables together
   Int_t nvt = valtok->GetEntriesFast();
   TString sumval;
   for( Int_t i=0; i<nvt; i++ ) {
      TObjString* val = (TObjString*)valtok->At( i );
      sumval.Append( val->String() );
   }
   // get the operator tokens
   TObjArray* optok = str1.Tokenize( sumval.Data() );
   // put all operator in one string
   TString operators;
   Int_t nopt = optok->GetEntriesFast();
   for( Int_t i=0; i<nopt; i++ ) {
      TObjString* val1 = (TObjString*)optok->At( i );
      operators.Append( val1->String() );
   }
   // add more room to be safe
   TObjString* blank = new TObjString(" ");
   operators.Append( " " );
   valtok->AddLast( blank );
   // Now put var. and oper. together
   TObjArray* tokens = new TObjArray( valtok->GetEntriesFast() + operators.Length() );
   int io = 0,iv = 0;
   int index = 0;
   while( 1 ) {
      TString so = operators[io];
      int indexO = str1.Index( so, index );
      TString val2 = ((TObjString*)valtok->At( iv ))->String();
      int indexV = str1.Index( val2, index );
      if( (indexO < indexV || indexV < 0) && indexO >=0 ) {
         tokens->AddLast( new TObjString( so ) );
         index += so.Length();
         io++;
      }
      if( (indexV < indexO || indexO < 0) && indexV >=0 ) {
         tokens->AddLast( new TObjString( val2 ) );
         index += val2.Length();
         iv++;
      }
      if( index >= str1.Length() ) break;
   }

//  Debug -> Print the tokens
//   Int_t nt = tokens->GetEntriesFast();
//   for( Int_t i=0; i<nt; i++ ) {
//      TObjString* val3 = (TObjString*)tokens->At( i );
//      cout << i << " " << val3->String() << endl;
//   }
   delete valtok;
   delete optok;

   return tokens;
}


//______________________________________________________________________________
AliExpression* AliExpression::Element( TObjArray &st, Int_t &i )
{
   // create an element
   
   AliExpression* result = 0;

   Int_t nt = st.GetEntriesFast();
   TString token = "@";
   TObjString* valt;
   // next token
   if( i < nt-1 ) {
      i++;
      valt = (TObjString*)st.At( i );
      token = valt->String();
   }
   // token type
   char ttok = ( token[0]!='|' && token[0]!='&' &&
                 token[0]!='!' && token[0]!='('&& token[0]!=')') ? 'w' : token[0];
   switch( ttok ) {
      case 'w' :
          result = new AliVariableExpression( token );
          break;
      case '(' :
          result = Expression(st, i);
            // next token
          if( i < nt-1 ) {
             i++;
             valt = (TObjString*)st.At( i );
             token = valt->String();
          }
          if( token[0] != ')' ) {
       //       i--; // push back
              AliErrorGeneral( "AliExpression::Element", "Mismatched parenthesis." );
              delete result;
              result = new AliExpression;
          }
          break;
      default:
          i--; // push back
          AliErrorGeneral( "AliExpression::Element", Form("Unexpected symbol on input. %s", token.Data()) );
          if( result ) delete result;
          result = new AliExpression;
   }
   return result;
}

//______________________________________________________________________________
AliExpression* AliExpression::Primary( TObjArray &st, Int_t &i )
{
   // create a primary
   
   Int_t nt = st.GetEntriesFast();
   TString token = "@";
   TObjString* valt;
   // next token
   if( i < nt-1 ) {
      i++;
      valt = (TObjString*)st.At( i );
      token = valt->String();
   }

   switch (token[0]) {
       case '!' :
           return new AliExpression( kOpNOT, Primary( st, i ) );
       default:
           i--; // push back
           return Element( st, i );
   }
}

//______________________________________________________________________________
AliExpression* AliExpression::Expression( TObjArray &st,Int_t &i )
{
   // create an expression
   
   AliExpression* result = 0;
   Bool_t done = kFALSE;
   TString token;
   TObjString* valt;

   static int stack = 0;
   stack++;
   Int_t nt = st.GetEntriesFast();

   result = Primary( st, i );
//   cout <<"i "<<i<< "Primary " << result->Unparse() << endl;
   while (! done) {
      // next token
      if( i < nt-1 ) i++;
      else break;
      valt = (TObjString*)st.At( i );
      token = valt->String();
      switch (token[0]) {
         case '&' :
             result = new AliExpression( kOpAND, result, Primary( st, i ) );
//   cout <<"i "<<i<< " Expression AND " << result->Unparse() << endl;
             break;
         case '|' :
             result = new AliExpression( kOpOR, result, Primary( st, i ) );
//   cout <<"i "<<i<< " Expression OR " << result->Unparse() << endl;
             break;
         default:
             done = kTRUE;
             i--; // push back
             break;
      }
   }
   stack--;
   if( stack == 0 && !token.IsNull() && token[0] == ')' ) {
      AliErrorGeneral( "AliExpression::Expression", "To many closing parenthesis." );
      delete result;
      result = new AliExpression;
   } else 
   if( stack == 0 && i< nt-1 ) {
      AliErrorGeneral( "AliExpression::Expression", Form( "Unexpected symbol on input. %s", token.Data() ) );
      delete result;
      result = new AliExpression;
   }
   return result;
}

////////////////////////////////////////////////////////////////////////////////

ClassImp( AliVariableExpression )

//______________________________________________________________________________
Bool_t AliVariableExpression::Value( TObjArray& pgm )
{
   // return the value
   TObject* dd = pgm.FindObject( fVname.Data() );
   if( dd == NULL ) {
      AliError( fVname + " is undefined" );
      return 0;
   }
   return ((AliTriggerInput*)dd)->GetValue();
}
Commit	Line	Data
a5a091ce	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	/* $Id$ */
	17
	18	///////////////////////////////////////////////////////////////////////////////
	19	// //
	20	// AliExpression Class // //
	21	// //
	22	// Helper class to evaluate the condition expressions in //
	23	// AliTriggerCondition //
	24	// Implements a simple recursive-descent parser //
	25	// //
	26	///////////////////////////////////////////////////////////////////////////////
	27
	28	//#include <Riostream.h>
	29	#include <TString.h>
	30	#include <TObjString.h>
	31	#include <TObjArray.h>
	32
	33	#include "AliLog.h"
	34	#include "AliExpression.h"
	35	#include "AliTriggerInput.h"
	36
	37	ClassImp( AliExpression )
	38
	39	//______________________________________________________________________________
	40	AliExpression::AliExpression( TString exp )
	41	{
	42	// Default constructor
	43	TObjArray* tokens = Tokenize( exp );
	44
	45	Int_t i = -1;
	46	AliExpression* e = Expression( *tokens, i );
	47	// Copy !!!
	48	fArg1 = e->fArg1; e->fArg1 = 0;
	49	fArg2 = e->fArg2; e->fArg2 = 0;
	50	fOperator = e->fOperator;
92c1978f	51	fVname = e->fVname;
a5a091ce	52	delete e;
	53	delete tokens;
	54	}
	55
	56	//______________________________________________________________________________
	57	AliExpression::~AliExpression()
	58	{
	59	if( fArg1 ) delete fArg1;
	60	if( fArg2 ) delete fArg2;
	61	}
	62
	63	//______________________________________________________________________________
	64	AliExpression& AliExpression::operator=(const AliExpression& e)
	65	{
	66	// AliExpression assignment operator.
	67
	68	if( this != &e ) {
	69	TObject::operator=(e);
	70	fArg1 = e.fArg1;
	71	fArg2 = e.fArg2;
	72	fOperator = e.fOperator;
92c1978f	73	fVname = e.fVname;
a5a091ce	74	}
	75	return *this;
	76	}
	77
	78	//______________________________________________________________________________
	79	AliExpression::AliExpression( int op, AliExpression* a, AliExpression* b )
	80	{
	81	// Create a new expression
	82	fArg1 = a;
	83	fArg2 = b;
	84	fOperator = op;
	85	}
	86
	87	//______________________________________________________________________________
	88	AliExpression::AliExpression( int op, AliExpression* a )
	89	{
	90	// Create a unary expression.
	91	fArg1 = 0;
	92	fArg2 = a;
	93	fOperator = op;
	94	}
	95
	96	//______________________________________________________________________________
	97	Bool_t AliExpression::Value( TObjArray &vars )
	98	{
	99	// Evaluate the expression
92c1978f	100	if ( fArg2 == 0 && fVname.IsNull() ) {
a5a091ce	101	AliError( "Expression undefined." );
	102	return kFALSE;
	103	}
	104
	105	switch (fOperator) {
	106
	107	case kOpOR :
	108	return fArg1->Value(vars) \|\| fArg2->Value(vars);
	109
	110	case kOpAND :
	111	return fArg1->Value(vars) && fArg2->Value(vars);
	112
	113	case kOpNOT :
	114	return !(fArg2->Value(vars));
	115
92c1978f	116	case 0 :
	117	{
	118	TObject* dd = vars.FindObject( fVname.Data() );
	119	if( dd == NULL ) {
	120	AliError( fVname + " is undefined" );
	121	return 0;
	122	}
	123	return ((AliTriggerInput*)dd)->GetValue();
	124	}
	125
a5a091ce	126	default:
	127	AliError( "Illegal operator in expression!");
	128
	129	}
	130	return kFALSE;
	131	}
	132
	133
	134	//______________________________________________________________________________
	135	TString AliExpression::Unparse() const
	136	{
	137	// Unparse the expression
	138
92c1978f	139	TString opVals[4] = { "", "&", "\|","!" };
	140	if ( fArg2 == 0 && fVname.IsNull() ) {
	141	AliError( "Expression undefined." );
	142	return "Error";
a5a091ce	143	}
a5a091ce	144
92c1978f	145	if( fArg2 == 0 && !fVname.IsNull() ) return fVname;
92c1978f	146
a5a091ce	147	if (fArg1 == 0 && fArg2) {
92c1978f	148	return opVals[fOperator]+fArg2->Unparse();
a5a091ce	149	}
	150	return "("+fArg1->Unparse()+" "+opVals[fOperator]+" "+fArg2->Unparse()+")";
	151	}
	152
	153	//______________________________________________________________________________
	154	TObjArray* AliExpression::Tokenize( TString str ) const
	155	{
	156	// tokenize the expression
	157
	158	// Remove spaces
	159	TString str1;
	160	for( Int_t i=0; i<str.Length(); i++ ) {
	161	if( str[i] == ' ' ) continue;
	162	str1.Append( str[i] );
	163	}
	164	// get variable tokens
	165	TObjArray* valtok = str1.Tokenize( "!&\|()" );
	166	// put all variables together
	167	Int_t nvt = valtok->GetEntriesFast();
	168	TString sumval;
	169	for( Int_t i=0; i<nvt; i++ ) {
	170	TObjString* val = (TObjString*)valtok->At( i );
	171	sumval.Append( val->String() );
	172	}
	173	// get the operator tokens
	174	TObjArray* optok = str1.Tokenize( sumval.Data() );
	175	// put all operator in one string
	176	TString operators;
	177	Int_t nopt = optok->GetEntriesFast();
	178	for( Int_t i=0; i<nopt; i++ ) {
	179	TObjString* val1 = (TObjString*)optok->At( i );
	180	operators.Append( val1->String() );
	181	}
	182	// add more room to be safe
	183	TObjString* blank = new TObjString(" ");
	184	operators.Append( " " );
	185	valtok->AddLast( blank );
	186	// Now put var. and oper. together
	187	TObjArray* tokens = new TObjArray( valtok->GetEntriesFast() + operators.Length() );
	188	int io = 0,iv = 0;
	189	int index = 0;
	190	while( 1 ) {
	191	TString so = operators[io];
	192	int indexO = str1.Index( so, index );
	193	TString val2 = ((TObjString*)valtok->At( iv ))->String();
	194	int indexV = str1.Index( val2, index );
	195	if( (indexO < indexV \|\| indexV < 0) && indexO >=0 ) {
	196	tokens->AddLast( new TObjString( so ) );
	197	index += so.Length();
	198	io++;
	199	}
	200	if( (indexV < indexO \|\| indexO < 0) && indexV >=0 ) {
	201	tokens->AddLast( new TObjString( val2 ) );
	202	index += val2.Length();
	203	iv++;
	204	}
	205	if( index >= str1.Length() ) break;
	206	}
	207
	208	// Debug -> Print the tokens
	209	// Int_t nt = tokens->GetEntriesFast();
	210	// for( Int_t i=0; i<nt; i++ ) {
	211	// TObjString* val3 = (TObjString*)tokens->At( i );
	212	// cout << i << " " << val3->String() << endl;
213	// }
214	delete valtok;
215	delete optok;
216
217	return tokens;
218	}
219
220
221	//______________________________________________________________________________
222	AliExpression* AliExpression::Element( TObjArray &st, Int_t &i )
223	{
224	// create an element
225
226	AliExpression* result = 0;
227
228	Int_t nt = st.GetEntriesFast();
229	TString token = "@";
230	TObjString* valt;
231	// next token
232	if( i < nt-1 ) {
233	i++;
234	valt = (TObjString*)st.At( i );
235	token = valt->String();
236	}
237	// token type
238	char ttok = ( token[0]!='\|' && token[0]!='&' &&
239	token[0]!='!' && token[0]!='('&& token[0]!=')') ? 'w' : token[0];
240	switch( ttok ) {
241	case 'w' :
242	result = new AliVariableExpression( token );
243	break;
244	case '(' :
245	result = Expression(st, i);
246	// next token
247	if( i < nt-1 ) {
248	i++;
249	valt = (TObjString*)st.At( i );
250	token = valt->String();
251	}
252	if( token[0] != ')' ) {
253	// i--; // push back
254	AliErrorGeneral( "AliExpression::Element", "Mismatched parenthesis." );
255	delete result;
256	result = new AliExpression;
257	}
258	break;
259	default:
260	i--; // push back
261	AliErrorGeneral( "AliExpression::Element", Form("Unexpected symbol on input. %s", token.Data()) );
262	if( result ) delete result;
263	result = new AliExpression;
264	}
265	return result;
266	}
267
268	//______________________________________________________________________________
269	AliExpression* AliExpression::Primary( TObjArray &st, Int_t &i )
270	{
271	// create a primary
272
273	Int_t nt = st.GetEntriesFast();
274	TString token = "@";
275	TObjString* valt;
276	// next token
277	if( i < nt-1 ) {
278	i++;
279	valt = (TObjString*)st.At( i );
280	token = valt->String();
281	}
282
283	switch (token[0]) {
284	case '!' :
285	return new AliExpression( kOpNOT, Primary( st, i ) );
286	default:
287	i--; // push back
288	return Element( st, i );
289	}
290	}
291
292	//______________________________________________________________________________
293	AliExpression* AliExpression::Expression( TObjArray &st,Int_t &i )
294	{
295	// create an expression
296
297	AliExpression* result = 0;
298	Bool_t done = kFALSE;
299	TString token;
300	TObjString* valt;
301
302	static int stack = 0;
303	stack++;
304	Int_t nt = st.GetEntriesFast();
305
306	result = Primary( st, i );
307	// cout <<"i "<<i<< "Primary " << result->Unparse() << endl;
308	while (! done) {
309	// next token
310	if( i < nt-1 ) i++;
311	else break;
312	valt = (TObjString*)st.At( i );
313	token = valt->String();
314	switch (token[0]) {
315	case '&' :
316	result = new AliExpression( kOpAND, result, Primary( st, i ) );
317	// cout <<"i "<<i<< " Expression AND " << result->Unparse() << endl;
318	break;
319	case '\|' :
320	result = new AliExpression( kOpOR, result, Primary( st, i ) );
321	// cout <<"i "<<i<< " Expression OR " << result->Unparse() << endl;
322	break;
323	default:
324	done = kTRUE;
325	i--; // push back
326	break;
327	}
328	}
329	stack--;
330	if( stack == 0 && !token.IsNull() && token[0] == ')' ) {
331	AliErrorGeneral( "AliExpression::Expression", "To many closing parenthesis." );
332	delete result;
333	result = new AliExpression;
334	} else
335	if( stack == 0 && i< nt-1 ) {
336	AliErrorGeneral( "AliExpression::Expression", Form( "Unexpected symbol on input. %s", token.Data() ) );
337	delete result;
338	result = new AliExpression;
339	}
340	return result;
341	}
342
343	////////////////////////////////////////////////////////////////////////////////
344
345	ClassImp( AliVariableExpression )
346
347	//______________________________________________________________________________
348	Bool_t AliVariableExpression::Value( TObjArray& pgm )
349	{
350	// return the value
351	TObject* dd = pgm.FindObject( fVname.Data() );
352	if( dd == NULL ) {
353	AliError( fVname + " is undefined" );
354	return 0;
355	}
356	return ((AliTriggerInput*)dd)->GetValue();
357	}
358