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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 | } |
144 | ||
92c1978f | 145 | if( fArg2 == 0 && !fVname.IsNull() ) return fVname; |
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 |