gerrit.simantics Code Review - simantics/platform.git/blob

   1 package org.simantics.scl.compiler.internal.parsing.parser;
   2
   3 import java.io.Reader;
   4 import java.util.ArrayList;
   5 import java.util.Arrays;
   6 import java.util.List;
   7
   8 import org.simantics.scl.compiler.common.exceptions.InternalCompilerError;
   9 import org.simantics.scl.compiler.common.precedence.Associativity;
  10 import org.simantics.scl.compiler.common.precedence.Precedence;
  11 import org.simantics.scl.compiler.constants.CharacterConstant;
  12 import org.simantics.scl.compiler.constants.StringConstant;
  13 import org.simantics.scl.compiler.elaboration.equation.EqBasic;
  14 import org.simantics.scl.compiler.elaboration.equation.EqGuard;
  15 import org.simantics.scl.compiler.elaboration.equation.Equation;
  16 import org.simantics.scl.compiler.elaboration.expressions.Case;
  17 import org.simantics.scl.compiler.elaboration.expressions.EApply;
  18 import org.simantics.scl.compiler.elaboration.expressions.EAsPattern;
  19 import org.simantics.scl.compiler.elaboration.expressions.EBinary;
  20 import org.simantics.scl.compiler.elaboration.expressions.EBinaryRightSide;
  21 import org.simantics.scl.compiler.elaboration.expressions.EBlock;
  22 import org.simantics.scl.compiler.elaboration.expressions.EConstant;
  23 import org.simantics.scl.compiler.elaboration.expressions.EEnforce;
  24 import org.simantics.scl.compiler.elaboration.expressions.EEquations;
  25 import org.simantics.scl.compiler.elaboration.expressions.EFieldAccess;
  26 import org.simantics.scl.compiler.elaboration.expressions.EIf;
  27 import org.simantics.scl.compiler.elaboration.expressions.EIntegerLiteral;
  28 import org.simantics.scl.compiler.elaboration.expressions.ELambda;
  29 import org.simantics.scl.compiler.elaboration.expressions.EListComprehension;
  30 import org.simantics.scl.compiler.elaboration.expressions.EListLiteral;
  31 import org.simantics.scl.compiler.elaboration.expressions.ELiteral;
  32 import org.simantics.scl.compiler.elaboration.expressions.EMatch;
  33 import org.simantics.scl.compiler.elaboration.expressions.ERange;
  34 import org.simantics.scl.compiler.elaboration.expressions.ERealLiteral;
  35 import org.simantics.scl.compiler.elaboration.expressions.ERecord;
  36 import org.simantics.scl.compiler.elaboration.expressions.ESelect;
  37 import org.simantics.scl.compiler.elaboration.expressions.ESimpleLambda;
  38 import org.simantics.scl.compiler.elaboration.expressions.EStringLiteral;
  39 import org.simantics.scl.compiler.elaboration.expressions.ETransformation;
  40 import org.simantics.scl.compiler.elaboration.expressions.ETypeAnnotation;
  41 import org.simantics.scl.compiler.elaboration.expressions.EVar;
  42 import org.simantics.scl.compiler.elaboration.expressions.EVariable;
  43 import org.simantics.scl.compiler.elaboration.expressions.EViewPattern;
  44 import org.simantics.scl.compiler.elaboration.expressions.Expression;
  45 import org.simantics.scl.compiler.elaboration.expressions.GuardedExpression;
  46 import org.simantics.scl.compiler.elaboration.expressions.GuardedExpressionGroup;
  47 import org.simantics.scl.compiler.elaboration.expressions.Variable;
  48 import org.simantics.scl.compiler.elaboration.expressions.accessor.ExpressionAccessor;
  49 import org.simantics.scl.compiler.elaboration.expressions.accessor.FieldAccessor;
  50 import org.simantics.scl.compiler.elaboration.expressions.accessor.IdAccessor;
  51 import org.simantics.scl.compiler.elaboration.expressions.accessor.StringAccessor;
  52 import org.simantics.scl.compiler.elaboration.expressions.block.BindStatement;
  53 import org.simantics.scl.compiler.elaboration.expressions.block.CHRStatement;
  54 import org.simantics.scl.compiler.elaboration.expressions.block.ConstraintStatement;
  55 import org.simantics.scl.compiler.elaboration.expressions.block.GuardStatement;
  56 import org.simantics.scl.compiler.elaboration.expressions.block.LetStatement;
  57 import org.simantics.scl.compiler.elaboration.expressions.block.RuleStatement;
  58 import org.simantics.scl.compiler.elaboration.expressions.block.Statement;
  59 import org.simantics.scl.compiler.elaboration.expressions.list.ListAssignment;
  60 import org.simantics.scl.compiler.elaboration.expressions.list.ListGenerator;
  61 import org.simantics.scl.compiler.elaboration.expressions.list.ListGuard;
  62 import org.simantics.scl.compiler.elaboration.expressions.list.ListQualifier;
  63 import org.simantics.scl.compiler.elaboration.expressions.list.ListSeq;
  64 import org.simantics.scl.compiler.elaboration.expressions.list.ListThen;
  65 import org.simantics.scl.compiler.elaboration.expressions.records.FieldAssignment;
  66 import org.simantics.scl.compiler.elaboration.java.Builtins;
  67 import org.simantics.scl.compiler.elaboration.query.QAlternative;
  68 import org.simantics.scl.compiler.elaboration.query.QConjunction;
  69 import org.simantics.scl.compiler.elaboration.query.QDisjunction;
  70 import org.simantics.scl.compiler.elaboration.query.QNegation;
  71 import org.simantics.scl.compiler.elaboration.query.Query;
  72 import org.simantics.scl.compiler.elaboration.query.pre.QPreBinds;
  73 import org.simantics.scl.compiler.elaboration.query.pre.QPreEquals;
  74 import org.simantics.scl.compiler.elaboration.query.pre.QPreGuard;
  75 import org.simantics.scl.compiler.errors.Locations;
  76 import org.simantics.scl.compiler.internal.parsing.Symbol;
  77 import org.simantics.scl.compiler.internal.parsing.Token;
  78 import org.simantics.scl.compiler.internal.parsing.declarations.ConstructorAst;
  79 import org.simantics.scl.compiler.internal.parsing.declarations.DAnnotationAst;
  80 import org.simantics.scl.compiler.internal.parsing.declarations.DClassAst;
  81 import org.simantics.scl.compiler.internal.parsing.declarations.DDataAst;
  82 import org.simantics.scl.compiler.internal.parsing.declarations.DDerivingInstanceAst;
  83 import org.simantics.scl.compiler.internal.parsing.declarations.DDocumentationAst;
  84 import org.simantics.scl.compiler.internal.parsing.declarations.DEffectAst;
  85 import org.simantics.scl.compiler.internal.parsing.declarations.DFixityAst;
  86 import org.simantics.scl.compiler.internal.parsing.declarations.DImportJavaAst;
  87 import org.simantics.scl.compiler.internal.parsing.declarations.DInstanceAst;
  88 import org.simantics.scl.compiler.internal.parsing.declarations.DMappingRelationAst;
  89 import org.simantics.scl.compiler.internal.parsing.declarations.DModuleHeader;
  90 import org.simantics.scl.compiler.internal.parsing.declarations.DRelationAst;
  91 import org.simantics.scl.compiler.internal.parsing.declarations.DRuleAst;
  92 import org.simantics.scl.compiler.internal.parsing.declarations.DTypeAst;
  93 import org.simantics.scl.compiler.internal.parsing.declarations.DValueAst;
  94 import org.simantics.scl.compiler.internal.parsing.declarations.DValueTypeAst;
  95 import org.simantics.scl.compiler.internal.parsing.declarations.DeclarationAst;
  96 import org.simantics.scl.compiler.internal.parsing.declarations.FieldDescription;
  97 import org.simantics.scl.compiler.internal.parsing.declarations.FundepAst;
  98 import org.simantics.scl.compiler.internal.parsing.exceptions.SCLSyntaxErrorException;
  99 import org.simantics.scl.compiler.internal.parsing.types.TApplyAst;
 100 import org.simantics.scl.compiler.internal.parsing.types.TEffectAst;
 101 import org.simantics.scl.compiler.internal.parsing.types.TForAllAst;
 102 import org.simantics.scl.compiler.internal.parsing.types.TFunctionAst;
 103 import org.simantics.scl.compiler.internal.parsing.types.TListAst;
 104 import org.simantics.scl.compiler.internal.parsing.types.TPredAst;
 105 import org.simantics.scl.compiler.internal.parsing.types.TTupleAst;
 106 import org.simantics.scl.compiler.internal.parsing.types.TVarAst;
 107 import org.simantics.scl.compiler.internal.parsing.types.TypeAst;
 108 import org.simantics.scl.compiler.module.ImportDeclaration;
 109 import org.simantics.scl.compiler.types.Types;
 110
 111
 112 public class SCLParserImpl extends SCLParser {
 113
 114     private final SCLPostLexer lexer;
 115     private SCLParserOptions options;
 116
 117     public SCLParserImpl(Reader reader) {
 118         lexer = new SCLPostLexer(reader);
 119     }
 120
 121     public void setParserOptions(SCLParserOptions options) {
 122         this.options = options;
 123         lexer.setParserOptions(options);
 124     }
 125
 126     public boolean isEmpty() throws Exception {
 127         return lexer.peekToken().id == SCLTerminals.EOF;
 128     }
 129
 130     @Override
 131     protected Token nextToken() {
 132         try {
 133             Token token = lexer.nextToken();
 134             /*System.out.println("TOKEN " + token.text + " (" + TERMINAL_NAMES[token.id] + ")" +
 135                     " ["
 136                     + Locations.beginOf(token.location) + ".."
 137                     + Locations.endOf(token.location) + "]");*/
 138             return token;
 139         } catch(Exception e) {
 140             if(e instanceof RuntimeException)
 141                 throw (RuntimeException)e;
 142             else
 143                 throw new RuntimeException(e);
 144         }
 145     }
 146
 147     @Override
 148     protected Object reduceDeclarations() {
 149         ArrayList<DeclarationAst> declarations = new ArrayList<DeclarationAst>(length()/2);
 150         for(int i=1;i<length();i+=2)
 151             declarations.add((DeclarationAst)get(i));
 152         return declarations;
 153     }
 154
 155     @Override
 156     protected Object reduceModule() {
 157         ArrayList<DeclarationAst> declarations = new ArrayList<DeclarationAst>(length()/2+1);
 158         for(int i=0;i<length();i+=2) {
 159             DeclarationAst declaration = (DeclarationAst)get(i);
 160             if(declaration == null)
 161                 throw new NullPointerException();
 162             declarations.add(declaration);
 163         }
 164         return declarations;
 165     }
 166
 167     @Override
 168     protected Object reduceModuleHeader() {
 169         FieldAssignment[] fields = new FieldAssignment[length()/2-1];
 170         for(int i=0;i<fields.length;++i)
 171             fields[i] = (FieldAssignment)get(2+i*2);
 172         return new DModuleHeader(fields);
 173     }
 174
 175     @Override
 176     protected Object reduceLocalTypeAnnotation() {
 177         if(length() == 1)
 178             return get(0);
 179         return new ETypeAnnotation((Expression)get(0), (TypeAst)get(2));
 180     }
 181
 182     @Override
 183     protected Object reduceTypeAnnotation() {
 184         EVar[] names = new EVar[length()/2];
 185         for(int i=0;i<names.length;++i)
 186             names[i] = (EVar)get(i*2);
 187         return new DValueTypeAst(
 188                 names,
 189                 (TypeAst)get(length()-1)
 190                 );
 191     }
 192
 193     @Override
 194     protected Object reduceValueDefinition() {
 195         Expression rhs = (Expression)get(1);
 196         return new DValueAst((Expression)get(0), rhs);
 197     }
 198
 199     @Override
 200     protected Object reduceDataDefinition() {
 201         int i=2;
 202         ArrayList<String> parameters = new ArrayList<String>();
 203         while(i < length()) {
 204             Token token = (Token)get(i++);
 205             if(token.id != SCLTerminals.ID)
 206                 break;
 207             parameters.add(token.text);
 208         }
 209         ArrayList<ConstructorAst> constructors = new ArrayList<ConstructorAst>();
 210         for(;i < length();i+=2)
 211             constructors.add((ConstructorAst)get(i));
 212         return new DDataAst(
 213                 ((Token)get(1)).text,
 214                 parameters.toArray(new String[parameters.size()]),
 215                 constructors.toArray(new ConstructorAst[constructors.size()]),
 216                 new String[0]
 217                 );
 218     }
 219
 220     @Override
 221     protected Object reduceTypeDefinition() {
 222         int i=2;
 223         ArrayList<String> parameters = new ArrayList<String>();
 224         while(true) {
 225             Token token = (Token)get(i++);
 226             if(token.id != SCLTerminals.ID)
 227                 break;
 228             parameters.add(token.text);
 229         }
 230         return new DTypeAst(
 231                 ((Token)get(1)).text,
 232                 parameters.toArray(new String[parameters.size()]),
 233                 (TypeAst)get(i)
 234                 );
 235     }
 236
 237     @SuppressWarnings("unchecked")
 238     @Override
 239     protected Object reduceClassDefinition() {
 240         int i=1;
 241         ArrayList<TypeAst> context;
 242         if(get(i) instanceof Token)
 243             context = new ArrayList<TypeAst>(0);
 244         else
 245             context = (ArrayList<TypeAst>)get(i++);
 246         String name = ((Token)get(i++)).text;
 247         ArrayList<String> parameters = new ArrayList<String>();
 248         while(i < length()) {
 249             Token token = (Token)get(i);
 250             if(token.id != SCLTerminals.ID)
 251                 break;
 252             parameters.add(token.text);
 253             ++i;
 254         }
 255         ArrayList<DeclarationAst> declarations = null;
 256         FundepAst[] fundeps = FundepAst.EMPTY_ARRAY;
 257         while(i < length()) {
 258             Token token = (Token)get(i++);
 259             if(token.id == SCLTerminals.WHERE) {
 260                 declarations = (ArrayList<DeclarationAst>)get(i++);
 261             }
 262             else if(token.id == SCLTerminals.BAR) {
 263                 fundeps = (FundepAst[])get(i++);
 264             }
 265             else
 266                 throw new InternalCompilerError();
 267         }
 268         return new DClassAst(context, name,
 269                 parameters.toArray(new String[parameters.size()]),
 270                 fundeps,
 271                 declarations);
 272     }
 273
 274     @Override
 275     protected Object reduceFundep() {
 276         String[] from = new String[length()-2];
 277         for(int i=0;i<from.length;++i)
 278             from[i] = ((Token)get(i)).text;
 279         String to = ((Token)get(length()-1)).text;
 280         return new FundepAst(from, to);
 281     }
 282
 283     @Override
 284     protected Object reduceFundeps() {
 285         FundepAst[] fundeps = new FundepAst[(length()+1)/2];
 286         for(int i=0;i<fundeps.length;++i)
 287             fundeps[i] = (FundepAst)get(i*2);
 288         return fundeps;
 289     }
 290
 291     @SuppressWarnings("unchecked")
 292     @Override
 293     protected Object reduceInstanceDefinition() {
 294         int i=1;
 295         ArrayList<TypeAst> context;
 296         if(get(i) instanceof Token)
 297             context = new ArrayList<TypeAst>(0);
 298         else
 299             context = (ArrayList<TypeAst>)get(i++);
 300         Token nameToken = (Token)get(i++);
 301         EVar name = new EVar(nameToken.location, nameToken.text);
 302         ArrayList<TypeAst> parameters = new ArrayList<TypeAst>();
 303         while(i < length()) {
 304             Object symbol = get(i++);
 305             if(symbol instanceof Token)
 306                 break;
 307             parameters.add((TypeAst)symbol);
 308         }
 309         ArrayList<DeclarationAst> declarations = null;
 310         if(i < length())
 311             declarations = (ArrayList<DeclarationAst>)get(i);
 312         return new DInstanceAst(context, name,
 313                 parameters.toArray(new TypeAst[parameters.size()]),
 314                 declarations);
 315     }
 316
 317     @SuppressWarnings("unchecked")
 318     @Override
 319     protected Object reduceDerivingInstanceDefinition() {
 320         int i=2;
 321         ArrayList<TypeAst> context;
 322         if(get(i) instanceof Token)
 323             context = new ArrayList<TypeAst>(0);
 324         else
 325             context = (ArrayList<TypeAst>)get(i++);
 326         Token nameToken = (Token)get(i++);
 327         EVar name = new EVar(nameToken.location, nameToken.text);
 328         ArrayList<TypeAst> parameters = new ArrayList<TypeAst>();
 329         while(i < length()) {
 330             Object symbol = get(i++);
 331             parameters.add((TypeAst)symbol);
 332         }
 333         return new DDerivingInstanceAst(context, name,
 334                 parameters.toArray(new TypeAst[parameters.size()]));
 335     }
 336
 337     @Override
 338     protected Object reduceDocumentationString() {
 339         return new DDocumentationAst(((Token)get(1)).text);
 340     }
 341
 342     @Override
 343     protected Object reduceAnnotation() {
 344         ArrayList<Expression> parameters = new ArrayList<Expression>(length()-1);
 345         for(int i=1;i<length();++i)
 346             parameters.add((Expression)get(i));
 347         return new DAnnotationAst((Token)get(0), parameters);
 348     }
 349
 350     @Override
 351     protected Object reducePrecedenceDefinition() {
 352         EVar[] symbols = new EVar[length()/2];
 353         for(int i=0;i<symbols.length;++i)
 354             symbols[i] = (EVar)get(2*i + 2);
 355         Associativity associativity;
 356         Token token = (Token)get(0);
 357         if(token.text.equals("infixl"))
 358             associativity = Associativity.LEFT;
 359         else if(token.text.equals("infixr"))
 360             associativity = Associativity.RIGHT;
 361         else
 362             associativity = Associativity.NONASSOC;
 363         return new DFixityAst(
 364                 new Precedence(
 365                         Integer.parseInt(((Token)get(1)).text),
 366                         associativity),
 367                         symbols);
 368     }
 369
 370     @Override
 371     protected Object reduceImport() {
 372         // (AS ID)? importSpec?
 373         int pos = 0;
 374         String importKeyword = ((Token)get(pos++)).text; // (IMPORT | INCLUDE)
 375         ++pos; // BEGIN_STRING
 376         String moduleName = ((Token)get(pos++)).text; // END_STRING
 377         String localName = "";
 378         if(pos < length()) {
 379             Object temp = get(pos);
 380             if(temp instanceof Token) {
 381                 Token token = (Token)temp;
 382                 if(token.id == SCLTerminals.AS) {
 383                     ++pos; // AS
 384                     localName = ((Token)get(pos++)).text; // ID
 385                 }
 386             }
 387         }
 388         ImportDeclaration.ImportSpec spec = ImportDeclaration.DEFAULT_SPEC;
 389         if(pos < length())
 390             spec = (ImportDeclaration.ImportSpec)get(pos++);
 391         return new ImportDeclaration(moduleName, localName,
 392                         importKeyword.equals("include"),
 393                         spec);
 394     }
 395
 396     @Override
 397     protected Object reduceJustImport() {
 398         return get(0);
 399     }
 400
 401     @SuppressWarnings("unchecked")
 402     @Override
 403     protected Object reduceImportJava() {
 404         return new DImportJavaAst(((Token)get(2)).text, (ArrayList<DeclarationAst>)get(4));
 405     }
 406
 407     @Override
 408     protected Object reduceEffectDefinition() {
 409         return new DEffectAst(
 410                 ((Token)get(1)).text,
 411                 ((Token)get(3)).text,
 412                 ((Token)get(5)).text);
 413     }
 414
 415     @Override
 416     protected Object reduceVarId() {
 417         return new EVar(((Token)get(0)).text);
 418     }
 419
 420     @Override
 421     protected Object reduceEscapedSymbol() {
 422         return new EVar(((Token)get(0)).text);
 423     }
 424
 425     @Override
 426     protected Object reduceTupleTypeConstructor() {
 427         return new TVarAst(Types.tupleConstructor(length()-1).name);
 428     }
 429
 430     @Override
 431     protected Object reduceArrow() {
 432         int i=length()-1;
 433         TypeAst result = (TypeAst)get(i);
 434         i-=2;
 435         while(i >= 0) {
 436             if( ((Token)get(i+1)).text.equals("=>") )
 437                 result = new TPredAst((TypeAst)get(i), result);
 438             else
 439                 result = new TFunctionAst((TypeAst)get(i), result);
 440             i-=2;
 441         }
 442         return result;
 443     }
 444
 445     @Override
 446     protected Object reduceBinary() {
 447         if(length() == 1)
 448             return get(0);
 449         int i=0;
 450         EVar negation = null;
 451         if(get(i) instanceof Token) {
 452             Token token = (Token)get(i++);
 453             negation = new EVar(token.location, token.text);
 454         }
 455         EBinary binary = new EBinary((Expression)get(i++), negation);
 456         while(i < length()) {
 457             EVar operator = (EVar)get(i++);
 458             Expression right = (Expression)get(i++);
 459             binary.rights.add(new EBinaryRightSide(operator, right));
 460         }
 461         return binary;
 462     }
 463
 464     @Override
 465     protected Object reduceSimpleRhs() {
 466         if(length() == 2)
 467             return get(1);
 468         else {
 469             EBlock block = (EBlock)get(3);
 470             Expression expression = (Expression)get(1);
 471             block.addStatement(new GuardStatement(expression));
 472             block.location = Locations.location(Locations.beginOf(expression.location), Locations.endOf(block.location));
 473             return block;
 474         }
 475     }
 476
 477     private GuardedExpressionGroup reduceGuardedExpressionGroup(int length) {
 478         GuardedExpression[] expressions = new GuardedExpression[length];
 479         for(int i=0;i<expressions.length;++i) {
 480             expressions[i] = (GuardedExpression)get(i);
 481         }
 482         return new GuardedExpressionGroup(expressions);
 483     }
 484
 485     @Override
 486     protected Object reduceGuardedRhs() {
 487         int length = length();
 488         if(length > 2 && get(length-2) instanceof Token) {
 489             EBlock block = (EBlock)get(length-1);
 490             block.addStatement(new GuardStatement(reduceGuardedExpressionGroup(length-2)));
 491             block.location = Locations.NO_LOCATION;
 492             return block;
 493         }
 494         else
 495             return reduceGuardedExpressionGroup(length);
 496     }
 497
 498     @Override
 499     protected Object reduceStatements() {
 500         EBlock block = new EBlock();
 501         if(length() > 2)
 502             for(int i=1;i<length();i+=2)
 503                 block.addStatement((Statement)get(i));
 504         return block;
 505     }
 506
 507     @Override
 508     protected Object reduceConstructor() {
 509         int idPos;
 510         for(idPos=0;idPos<length();idPos+=2)
 511             if(((Token)get(idPos)).id == SCLTerminals.ID)
 512                 break;
 513         DAnnotationAst[] annotations = idPos == 0 ? DAnnotationAst.EMPTY_ARRAY : new DAnnotationAst[idPos/2];
 514         for(int i=0;i<idPos/2;++i)
 515             annotations[i] = new DAnnotationAst((Token)get(i*2),
 516                     Arrays.asList((Expression)get(i*2+1)));
 517         TypeAst[] parameters = new TypeAst[length()-idPos-1];
 518         for(int i=0;i<parameters.length;++i)
 519             parameters[i] = (TypeAst)get(i+idPos+1);
 520         return new ConstructorAst(annotations, ((Token)get(idPos)).text, parameters, null);
 521     }
 522
 523     @Override
 524     protected Object reduceContext() {
 525         ArrayList<TypeAst> result = new ArrayList<TypeAst>(length()/2-1);
 526         for(int i=1;i<length()-2;i+=2)
 527             result.add((TypeAst)get(i));
 528         return result;
 529     }
 530
 531     @Override
 532     protected Object reduceTypeVar() {
 533         return new TVarAst(((Token)get(0)).text);
 534     }
 535
 536     @Override
 537     protected Object reduceTupleType() {
 538         if(length() == 2)
 539             return new TTupleAst(TypeAst.EMPTY_ARRAY);
 540         if(length() == 3) {
 541             Symbol sym = (Symbol)get(1);
 542             sym.location = Locations.NO_LOCATION;
 543             return sym;
 544         }
 545         int dim = length()/2;
 546         TypeAst[] parameters = new TypeAst[dim];
 547         for(int i=0;i<dim;++i)
 548             parameters[i] = (TypeAst)get(i*2+1);
 549         return new TTupleAst(parameters);
 550     }
 551
 552     @Override
 553     protected Object reduceListType() {
 554         return new TListAst((TypeAst)get(1));
 555     }
 556
 557     @Override
 558     protected Object reduceListTypeConstructor() {
 559         return new TVarAst("[]");
 560     }
 561
 562     @Override
 563     protected Object reduceTupleConstructor() {
 564         return new EVar(Types.tupleConstructor(length()-1).name);
 565     }
 566
 567     @Override
 568     protected Object reduceVar() {
 569         return get(0);
 570     }
 571
 572     @Override
 573     protected Object reduceBlank() {
 574         return new EVar("_");
 575     }
 576
 577     @Override
 578     protected Object reduceInteger() {
 579         return new EIntegerLiteral(((Token)get(0)).text);
 580     }
 581
 582     @Override
 583     protected Object reduceFloat() {
 584         return new ERealLiteral(((Token)get(0)).text);
 585     }
 586
 587     @Override
 588     protected Object reduceString() {
 589         return get(0);
 590     }
 591
 592     @Override
 593     protected Object reduceChar() {
 594         String text = ((Token)get(0)).text;
 595         char c = text.charAt(text.length()-2);
 596         if(text.length() == 4) {
 597             switch(c) {
 598             case 'n': c = '\n'; break;
 599             case 't': c = '\t'; break;
 600             case 'b': c = '\b'; break;
 601             case 'f': c = '\f'; break;
 602             case 'r': c = '\r'; break;
 603             }
 604         }
 605         return new ELiteral(new CharacterConstant(c));
 606     }
 607
 608     @Override
 609     protected Object reduceTuple() {
 610         if(length() == 2)
 611             return new EConstant(Builtins.TUPLE_CONSTRUCTORS[0]);
 612         if(length() == 3) {
 613             Symbol sym = (Symbol)get(1);
 614             sym.location = Locations.NO_LOCATION;
 615             return sym;
 616         }
 617         int dim = length()/2;
 618         Expression[] parameters = new Expression[dim];
 619         for(int i=0;i<dim;++i)
 620             parameters[i] = (Expression)get(i*2+1);
 621         EConstant tupleConstructor = new EConstant(Builtins.TUPLE_CONSTRUCTORS[dim]);
 622         tupleConstructor.location = Locations.location(
 623                 Locations.beginOf(((Token)get(0)).location),
 624                 Locations.endOf(((Token)get(length()-1)).location));
 625         return new EApply(tupleConstructor, parameters);
 626     }
 627
 628     public static Expression rightSection(EVar op, Expression e) {
 629         long loc = Locations.combine(op.location, e.location);
 630         Variable var = new Variable("rightSectionTemp");
 631         return new ESimpleLambda(loc, var,
 632                 new EApply(loc, op, new EVariable(loc, var), e));
 633     }
 634
 635     @Override
 636     protected Object reduceRightSection() {
 637         Variable var = new Variable("rightSectionTemp");
 638         long loc = Locations.combine(((Token)get(0)).location, ((Token)get(length()-1)).location);
 639         EVar symbol = (EVar)get(1);
 640         return new ESimpleLambda(var,
 641                 new EApply(loc, symbol,
 642                         new EVariable(loc, var), (Expression)get(2)));
 643     }
 644
 645     @Override
 646     protected Object reduceLeftSection() {
 647         return new EApply((EVar)get(2), (Expression)get(1));
 648     }
 649
 650     @Override
 651     protected Object reduceListLiteral() {
 652         if(length() == 2)
 653             return new EListLiteral(Expression.EMPTY_ARRAY);
 654         int dim = length()/2;
 655         Expression[] components = new Expression[dim];
 656         for(int i=0;i<dim;++i)
 657             components[i] = (Expression)get(i*2+1);
 658         return new EListLiteral(components);
 659     }
 660
 661     @Override
 662     protected Object reduceRange() {
 663         return new ERange(
 664                 (Expression)get(1),
 665                 (Expression)get(3)
 666                 );
 667     }
 668
 669     @Override
 670     protected Object reduceListComprehension() {
 671         ListQualifier qualifier = (ListQualifier)get(3);
 672         for(int i=5;i<length();i+=2) {
 673             ListQualifier right = (ListQualifier)get(i);
 674             if(right instanceof ListThen) {
 675                 ((ListThen) right).setLeft(qualifier);
 676                 qualifier = right;
 677             }
 678             else
 679                 qualifier = new ListSeq(qualifier, right);
 680         }
 681         return new EListComprehension((Expression)get(1), qualifier);
 682     }
 683
 684     @Override
 685     protected Object reduceAs() {
 686         Token id = (Token)get(0);
 687         return new EAsPattern(new EVar(id.location, id.text), (Expression)get(2));
 688     }
 689
 690     @Override
 691     protected Object reduceGuardedExpEq() {
 692         Expression[] guards = new Expression[length()/2-1];
 693         for(int i=0;i<guards.length;++i)
 694             guards[i] = (Expression)get(i*2+1);
 695         return new GuardedExpression(guards, (Expression)get(length()-1));
 696     }
 697
 698     @Override
 699     protected Object reduceLambda() {
 700         Expression[] patterns = new Expression[length()-3];
 701         for(int i=0;i<patterns.length;++i)
 702             patterns[i] = (Expression)get(i+1);
 703         Case case_ = new Case(patterns, (Expression)get(length()-1));
 704         case_.setLhs(Locations.combine(patterns[0].location, patterns[patterns.length-1].location));
 705         return new ELambda(case_);
 706     }
 707
 708     @Override
 709     protected Object reduceLambdaMatch() {
 710         Case[] cases = new Case[length()/2-1];
 711         for(int i=0;i<cases.length;++i)
 712             cases[i] = (Case)get(i*2+2);
 713         return new ELambda(cases);
 714     }
 715
 716     @Override
 717     protected Object reduceLet() {
 718         EBlock block = (EBlock)get(1);
 719         Expression expression = (Expression)get(3);
 720         block.addStatement(new GuardStatement(expression));
 721         Token letToken = (Token)get(0);
 722         block.location = Locations.location(
 723                 Locations.beginOf(letToken.location),
 724                 Locations.endOf(expression.location));
 725         return block;
 726     }
 727
 728     @Override
 729     protected Object reduceIf() {
 730         return new EIf(
 731                 (Expression)get(1),
 732                 (Expression)get(3),
 733                 length() == 6 ? (Expression)get(5) : null);
 734     }
 735
 736     @Override
 737     protected Object reduceMatch() {
 738         Case[] cases = new Case[length()/2-2];
 739         for(int i=0;i<cases.length;++i)
 740             cases[i] = (Case)get(i*2+4);
 741         return new EMatch((Expression)get(1), cases);
 742     }
 743
 744     @Override
 745     protected Object reduceDo() {
 746         EBlock block = (EBlock)get(1);
 747         Token doToken = (Token)get(0);
 748         block.setMonadic( doToken.text.equals("mdo") );
 749         block.location = Locations.location(Locations.beginOf(doToken.location), Locations.endOf(block.location));
 750         return block;
 751     }
 752
 753     @Override
 754     protected Object reduceSelect() {
 755         return new ESelect(((Token)get(0)).id, (Expression)get(1), new QConjunction((Query[])get(3)));
 756     }
 757
 758     @Override
 759     protected Object reduceEnforce() {
 760         return new EEnforce(new QConjunction((Query[])get(1)));
 761     }
 762
 763     @Override
 764     protected Object reduceApply() {
 765         if(length() == 1)
 766             return get(0);
 767         Expression[] parameters = new Expression[length()-1];
 768         for(int i=0;i<parameters.length;++i)
 769             parameters[i] = (Expression)get(i+1);
 770         return new EApply((Expression)get(0), parameters);
 771     }
 772
 773     @Override
 774     protected Object reduceSymbol() {
 775         return new EVar(((Token)get(0)).text);
 776     }
 777
 778     @Override
 779     protected Object reduceEscapedId() {
 780         return new EVar(((Token)get(0)).text);
 781     }
 782
 783     @Override
 784     protected Object reduceMinus() {
 785         return new EVar(((Token)get(0)).text);
 786     }
 787
 788     @Override
 789     protected Object reduceLess() {
 790         return new EVar(((Token)get(0)).text);
 791     }
 792
 793     @Override
 794     protected Object reduceGreater() {
 795         return new EVar(((Token)get(0)).text);
 796     }
 797
 798     @Override
 799     protected Object reduceDot() {
 800         return new EVar(((Token)get(0)).text);
 801     }
 802
 803     @Override
 804     protected Object reduceCase() {
 805         return new Case((Expression)get(0), (Expression)get(1));
 806     }
 807
 808     @Override
 809     protected Object reduceGuardQualifier() {
 810         return new ListGuard((Expression)get(0));
 811     }
 812
 813     @Override
 814     protected Object reduceLetQualifier() {
 815         return new ListAssignment((Expression)get(0), (Expression)get(2));
 816     }
 817
 818     @Override
 819     protected Object reduceBindQualifier() {
 820         return new ListGenerator((Expression)get(0), (Expression)get(2));
 821     }
 822
 823     @Override
 824     protected Object reduceThenQualifier() {
 825         return new ListThen((Expression)get(1), length()==4 ? (Expression)get(3) : null);
 826     }
 827
 828     @Override
 829     protected Object reduceGuardStatement() {
 830         return new GuardStatement((Expression)get(0));
 831     }
 832
 833     @Override
 834     protected Object reduceLetStatement() {
 835         return new LetStatement((Expression)get(0), (Expression)get(1));
 836     }
 837
 838     @Override
 839     protected Object reduceBindStatement() {
 840         return new BindStatement((Expression)get(0), (Expression)get(2));
 841     }
 842
 843     @Override
 844     protected Object reduceSimpleCaseRhs() {
 845         return get(1);
 846     }
 847
 848     @Override
 849     protected Object reduceGuardedCaseRhs() {
 850         GuardedExpression[] expressions = new GuardedExpression[length()];
 851         for(int i=0;i<expressions.length;++i)
 852             expressions[i] = (GuardedExpression)get(i);
 853         return new GuardedExpressionGroup(expressions);
 854     }
 855
 856     @Override
 857     protected Object reduceGuardedExpArrow() {
 858         Expression[] guards = new Expression[length()/2-1];
 859         for(int i=0;i<guards.length;++i)
 860             guards[i] = (Expression)get(i*2+1);
 861         return new GuardedExpression(guards, (Expression)get(length()-1));
 862     }
 863
 864     @Override
 865     protected Object reduceEffect() {
 866         ArrayList<TypeAst> effects = new ArrayList<TypeAst>(length()/2-1);
 867         for(int i=1;i<length()-1;i+=2) {
 868             Token token = (Token)get(i);
 869             TVarAst ast = new TVarAst(token.text);
 870             ast.location = token.location;
 871             effects.add(ast);
 872         }
 873         return new TEffectAst(effects, (TypeAst)get(length()-1));
 874     }
 875
 876     @Override
 877     protected Object reduceJustEtype() {
 878         return get(0);
 879     }
 880
 881     @Override
 882     protected Object reduceForAll() {
 883         String[] vars = new String[length()-3];
 884         for(int i=0;i<vars.length;++i)
 885             vars[i] = ((Token)get(i+1)).text;
 886         return new TForAllAst(vars, (TypeAst)get(length()-1));
 887     }
 888
 889     @Override
 890     protected Object reduceApplyType() {
 891         TypeAst[] parameters = new TypeAst[length()-1];
 892         for(int i=0;i<parameters.length;++i)
 893             parameters[i] = (TypeAst)get(i+1);
 894         return new TApplyAst((TypeAst)get(0), parameters);
 895     }
 896
 897     @SuppressWarnings("unchecked")
 898     @Override
 899     protected void postReduce(Object reduced) {
 900         if(!(reduced instanceof Symbol))
 901             return;
 902         Symbol sym = (Symbol)reduced;
 903         if(sym.location != Locations.NO_LOCATION || length() == 0)
 904             return;
 905         Object first = get(0);
 906         if(!(first instanceof Symbol)) {
 907             if(first instanceof List) {
 908                 List<Object> ll = (List<Object>)first;
 909                 first = ll.get(0);
 910             }
 911             else {
 912                 Object[] ll = (Object[])first;
 913                 if(ll.length > 0)
 914                     first = ll[0];
 915                 else
 916                     first = get(1);
 917             }
 918         }
 919         Object last = get(length()-1);
 920         if(!(last instanceof Symbol)) {
 921             if(last instanceof List) {
 922                 List<Object> ll = (List<Object>)last;
 923                 last = ll.get(ll.size()-1);
 924             }
 925             else {
 926                 Object[] ll = (Object[])last;
 927                 if(ll.length > 0)
 928                     last = ll[ll.length-1];
 929                 else
 930                     last = get(length()-2);
 931             }
 932         }
 933         sym.location = (((Symbol)first).location & 0xffffffff00000000L)
 934                 | (((Symbol)last).location & 0xffffffffL);
 935         /*for(int i=0;i<length();++i) {
 936             Object obj = get(i);
 937             System.out.print(obj.getClass().getSimpleName());
 938             if(obj instanceof Token) {
 939                 Token t = (Token)obj;
 940                 System.out.print("(" + t.text + ")");
 941             }
 942             if(obj instanceof Symbol) {
 943                 Symbol s = (Symbol)obj;
 944                 System.out.print("["+ Locations.beginOf(s.location) + "-" + Locations.endOf(s.location) + "]");
 945             }
 946             System.out.print(" ");
 947         }
 948         System.out.println("-> " + reduced.getClass().getSimpleName() + " " +
 949                 Locations.beginOf(sym.location) + "-" + Locations.endOf(sym.location));*/
 950     }
 951
 952     @Override
 953     protected RuntimeException syntaxError(Token token, String description) {
 954         throw new SCLSyntaxErrorException(token.location, description);
 955     }
 956
 957     @Override
 958     protected Object reduceIdAccessor() {
 959         return new IdAccessor('.', ((Token)get(0)).text);
 960     }
 961
 962     @Override
 963     protected Object reduceStringAccessor() {
 964         return new StringAccessor('.', ((Token)get(1)).text);
 965     }
 966
 967     @Override
 968     protected Object reduceExpAccessor() {
 969         return new ExpressionAccessor('.', (Expression)get(1));
 970     }
 971
 972     @Override
 973     protected Object reduceFieldAccess() {
 974         if(length() == 1)
 975             return get(0);
 976         Expression result = (Expression)get(0);
 977         for(int i=2;i<length();i+=2) {
 978             FieldAccessor accessor = (FieldAccessor)get(i);
 979             accessor.accessSeparator = ((Token)get(i-1)).text.charAt(0);
 980             result = new EFieldAccess(result, accessor);
 981         }
 982         return result;
 983     }
 984
 985     @Override
 986     protected Object reduceQueryBlock() {
 987         if(length() == 2)
 988             return Query.EMPTY_ARRAY;
 989         Query[] queries = new Query[length()/2];
 990         for(int i=0;i<queries.length;++i)
 991             queries[i] = (Query)get(2*i+1);
 992         return queries;
 993     }
 994
 995     @Override
 996     protected Object reduceGuardQuery() {
 997         return new QPreGuard((Expression)get(0));
 998     }
 999
1000     @Override
1001     protected Object reduceEqualsQuery() {
1002         return new QPreEquals((Expression)get(0), (Expression)get(2));
1003     }
1004
1005     @Override
1006     protected Object reduceBindQuery() {
1007         return new QPreBinds((Expression)get(0), (Expression)get(2));
1008     }
1009
1010     @Override
1011     protected Object reduceCompositeQuery() {
1012         Query[] queries = (Query[])get(1);
1013         switch(((Token)get(0)).text.charAt(1)) {
1014         case '&': return new QConjunction(queries);
1015         case '|': return new QDisjunction(queries);
1016         case '!': return new QNegation(new QConjunction(queries));
1017         case '?': return new QAlternative(queries);
1018         default: throw new InternalCompilerError();
1019         }
1020     }
1021
1022     @Override
1023     protected Object reduceRuleStatement() {
1024         return new RuleStatement((Expression)get(0), new QConjunction((Query[])get(2)));
1025     }
1026
1027     @Override
1028     protected Object reduceHashedId() {
1029         return new EVar("#" + ((Token)get(1)).text);
1030     }
1031
1032     @Override
1033     protected Object reduceStringLiteral() {
1034         int expCount = length()/3;
1035         if(expCount == 0)
1036             return new ELiteral(new StringConstant(((Token)get(1)).text));
1037         else {
1038             String[] strings = new String[expCount+1];
1039             Expression[] expressions = new Expression[expCount];
1040             for(int i=0;i<expCount;++i) {
1041                 strings[i] = ((Token)get(i*3+1)).text;
1042                 expressions[i] = (Expression)get(i*3+2);
1043             }
1044             strings[expCount] = ((Token)get(expCount*3+1)).text;
1045             return new EStringLiteral(strings, expressions);
1046         }
1047     }
1048
1049     @Override
1050     protected Object reduceOneCommand() {
1051         return null;
1052     }
1053
1054     @Override
1055     protected Object reduceManyCommands() {
1056         return null;
1057     }
1058
1059     @Override
1060     protected Object reduceStatementCommand() {
1061         // to be extended in subclasses
1062         return null;
1063     }
1064
1065     @Override
1066     protected Object reduceImportCommand() {
1067         // to be extended in subclasses
1068         return null;
1069     }
1070
1071     @Override
1072     protected Object reduceImportValueItem() {
1073         return new EVar(((Token)get(0)).text);
1074     }
1075
1076     @Override
1077     protected Object reduceImportHiding() {
1078         EVar[] values = new EVar[(length()-2)/2];
1079         for(int i=0;i<values.length;++i)
1080             values[i] = (EVar)get(i*2+2);
1081         return new ImportDeclaration.ImportSpec(true, values);
1082     }
1083
1084     @Override
1085     protected Object reduceImportShowing() {
1086         EVar[] values = new EVar[(length()-1)/2];
1087         for(int i=0;i<values.length;++i)
1088             values[i] = (EVar)get(i*2+1);
1089         return new ImportDeclaration.ImportSpec(false, values);
1090     }
1091
1092     @Override
1093     protected Object reduceRuleDeclarations() {
1094         ArrayList<Object> declarations = new ArrayList<Object>(length()/2);
1095         for(int i=1;i<length();i+=2)
1096             declarations.add((Object)get(i));
1097         return declarations;
1098     }
1099
1100     private static final String[] EMPTY_STRING_ARRAY = new String[0];
1101
1102     @SuppressWarnings("unchecked")
1103     @Override
1104     protected Object reduceRuleDefinition() {
1105         String[] extendsNames = EMPTY_STRING_ARRAY;
1106         if(length() >= 6) {
1107             int extendsCount = (length() - 4) / 2;
1108             extendsNames = new String[extendsCount];
1109             for(int i=0;i<extendsCount;++i)
1110                 extendsNames[i] = ((Token)get(3+i*2)).text;
1111         }
1112
1113         DRuleAst rule = new DRuleAst(
1114                 ((Token)get(0)).id == SCLTerminals.ABSTRACT_RULE,
1115                 ((Token)get(1)).text,
1116                 extendsNames);
1117
1118         ArrayList<Object> ruleDeclarations = (ArrayList<Object>)get(length()-1);
1119         ArrayList<Query> section = null;
1120         for(Object decl : ruleDeclarations) {
1121             if(decl instanceof DAnnotationAst) {
1122                 DAnnotationAst annotation = (DAnnotationAst)decl;
1123                 section = rule.getSection(annotation.id.text.substring(1));
1124             }
1125             else if(decl instanceof Query) {
1126                 if(section == null)
1127                     section = rule.getSection("when");
1128                 section.add((Query)decl);
1129             }
1130             else
1131                 throw new InternalCompilerError();
1132         }
1133         return rule;
1134     }
1135
1136     @Override
1137     protected Object reduceQueryRuleDeclaration() {
1138         return get(0);
1139     }
1140
1141     @Override
1142     protected Object reduceMappingRelationDefinition() {
1143         TypeAst[] types = new TypeAst[length()-2];
1144         for(int i=0;i<types.length;++i)
1145             types[i] = (TypeAst)get(i+2);
1146         return new DMappingRelationAst(
1147                 ((Token)get(1)).text,
1148                 types);
1149     }
1150
1151     @Override
1152     protected Object reduceTransformation() {
1153         return new ETransformation(
1154                 ((Token)get(1)).text,
1155                 new QConjunction((Query[])get(3))
1156                 );
1157     }
1158
1159     @SuppressWarnings("unchecked")
1160     @Override
1161     protected Object reduceRelationDefinition() {
1162         return new DRelationAst((Expression)get(0),
1163                 ((ArrayList<Object>)get(2)).toArray());
1164     }
1165
1166     @Override
1167     protected Object reduceRecord() {
1168         FieldAssignment[] fields = new FieldAssignment[length()/2-1];
1169         for(int i=0;i<fields.length;++i)
1170             fields[i] = (FieldAssignment)get(2+i*2);
1171         return new ERecord((Token)get(0), fields);
1172     }
1173
1174     @Override
1175     protected Object reduceField() {
1176         return new FieldAssignment(((Token)get(0)).text, (Expression)get(2));
1177     }
1178
1179     @Override
1180     protected Object reduceFieldShorthand() {
1181         return new FieldAssignment(((Token)get(0)).text, null);
1182     }
1183
1184     @Override
1185     protected Object reduceRecordConstructor() {
1186         int idPos;
1187         for(idPos=0;idPos<length();idPos+=2)
1188             if(((Token)get(idPos)).id == SCLTerminals.ID)
1189                 break;
1190         DAnnotationAst[] annotations = idPos == 0 ? DAnnotationAst.EMPTY_ARRAY : new DAnnotationAst[idPos/2];
1191         for(int i=0;i<idPos/2;++i)
1192             annotations[i] = new DAnnotationAst((Token)get(i*2),
1193                     Arrays.asList((Expression)get(i*2+1)));
1194         TypeAst[] parameters = new TypeAst[(length()-idPos-1)/2];
1195         String[] fieldNames = new String[parameters.length];
1196         for(int i=0;i<parameters.length;++i) {
1197             FieldDescription fieldDesc = (FieldDescription)get(idPos+(i+1)*2);
1198             parameters[i] = fieldDesc.type;
1199             fieldNames[i] = fieldDesc.name;
1200         }
1201         return new ConstructorAst(annotations, ((Token)get(idPos)).text, parameters, fieldNames);
1202     }
1203
1204     @Override
1205     protected Object reduceFieldDescription() {
1206         return new FieldDescription(((Token)get(0)).text, (TypeAst)get(2));
1207     }
1208
1209     @Override
1210     protected Object reduceEq() {
1211         return (Expression)get(2);
1212     }
1213
1214     @Override
1215     protected Object reduceEquationBlock() {
1216         if(length() == 0)
1217             return new EEquations(Equation.EMPTY_ARRAY);
1218         Equation[] equations = new Equation[length()/2+1];
1219         for(int i=0;i<equations.length;++i)
1220             equations[i] = (Equation)get(2*i);
1221         return new EEquations(equations);
1222     }
1223
1224     @Override
1225     protected Object reduceGuardEquation() {
1226         return new EqGuard((Expression)get(0));
1227     }
1228
1229     @Override
1230     protected Object reduceBasicEquation() {
1231         return new EqBasic((Expression)get(0), (Expression)get(2));
1232     }
1233
1234     @Override
1235     protected Object reduceViewPattern() {
1236         return new EViewPattern((Expression)get(1), (Expression)get(3));
1237     }
1238
1239     @Override
1240     protected Object reduceCHRStatement() {
1241         return new CHRStatement((ListQualifier[])get(0), (ListQualifier[])get(2));
1242     }
1243
1244     @Override
1245     protected Object reduceConstraintStatement() {
1246         TypeAst[] parameterTypes = new TypeAst[length()-2];
1247         for(int i=0;i<parameterTypes.length;++i)
1248             parameterTypes[i] = (TypeAst)get(2+i);
1249         return new ConstraintStatement((Token)get(1), parameterTypes);
1250     }
1251
1252     @Override
1253     protected Object reduceCHRQuery() {
1254         ListQualifier[] query = new ListQualifier[(length()+1)/2];
1255         for(int i=0;i<query.length;++i)
1256             query[i] = (ListQualifier)get(i*2);
1257         return query;
1258     }
1259
1260     /*
1261     @Override
1262     protected Object reduceWhen() {
1263         return new EWhen(
1264                 new QConjunction((Query[])get(1)),
1265                 (Expression)get(3));
1266     }*/
1267
1268     @Override
1269     protected Object reduceVerboseCHRQuery() {
1270         ListQualifier[] query = new ListQualifier[(length()-1)/2];
1271         for(int i=0;i<query.length;++i)
1272             query[i] = (ListQualifier)get(i*2+1);
1273         return query;
1274     }
1275
1276     @Override
1277     protected Object reduceVerboseCHRStatement() {
1278         return new CHRStatement((ListQualifier[])get(1), (ListQualifier[])get(3));
1279     }
1280
1281     @Override
1282     protected Object reduceDummy() {
1283         throw new UnsupportedOperationException();
1284     }
1285
1286     @Override
1287     protected Object reduceRulesetDefinition() {
1288         // TODO Auto-generated method stub
1289         return null;
1290     }
1291
1292     @Override
1293     protected Object reduceLocalInclude() {
1294         // TODO Auto-generated method stub
1295         return null;
1296     }
1297
1298 }