bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/commands/CommandSession.java

   1 package org.simantics.scl.compiler.commands;
   2
   3 import java.io.BufferedReader;
   4 import java.io.FileNotFoundException;
   5 import java.io.FileOutputStream;
   6 import java.io.IOException;
   7 import java.io.PrintStream;
   8 import java.io.Reader;
   9 import java.io.StringReader;
  10 import java.io.UnsupportedEncodingException;
  11 import java.util.ArrayList;
  12 import java.util.Collection;
  13 import java.util.Collections;
  14 import java.util.LinkedList;
  15 import java.util.List;
  16 import java.util.Map;
  17 import java.util.Set;
  18
  19 import org.simantics.scl.compiler.common.names.Name;
  20 import org.simantics.scl.compiler.constants.StringConstant;
  21 import org.simantics.scl.compiler.elaboration.expressions.EApply;
  22 import org.simantics.scl.compiler.elaboration.expressions.EBlock;
  23 import org.simantics.scl.compiler.elaboration.expressions.EConstant;
  24 import org.simantics.scl.compiler.elaboration.expressions.EExternalConstant;
  25 import org.simantics.scl.compiler.elaboration.expressions.ELiteral;
  26 import org.simantics.scl.compiler.elaboration.expressions.EVariable;
  27 import org.simantics.scl.compiler.elaboration.expressions.Expression;
  28 import org.simantics.scl.compiler.elaboration.expressions.Variable;
  29 import org.simantics.scl.compiler.elaboration.expressions.block.GuardStatement;
  30 import org.simantics.scl.compiler.elaboration.expressions.block.Statement;
  31 import org.simantics.scl.compiler.environment.AbstractLocalEnvironment;
  32 import org.simantics.scl.compiler.environment.Environment;
  33 import org.simantics.scl.compiler.environment.LocalEnvironment;
  34 import org.simantics.scl.compiler.environment.specification.EnvironmentSpecification;
  35 import org.simantics.scl.compiler.errors.CompilationError;
  36 import org.simantics.scl.compiler.errors.Locations;
  37 import org.simantics.scl.compiler.internal.codegen.utils.NameMangling;
  38 import org.simantics.scl.compiler.internal.parsing.exceptions.SCLSyntaxErrorException;
  39 import org.simantics.scl.compiler.internal.parsing.parser.SCLParserImpl;
  40 import org.simantics.scl.compiler.internal.parsing.utils.LaxUTF8Reader;
  41 import org.simantics.scl.compiler.internal.parsing.utils.MemoReader;
  42 import org.simantics.scl.compiler.module.ImportDeclaration;
  43 import org.simantics.scl.compiler.module.repository.ImportFailure;
  44 import org.simantics.scl.compiler.module.repository.ImportFailureException;
  45 import org.simantics.scl.compiler.module.repository.ModuleRepository;
  46 import org.simantics.scl.compiler.runtime.RuntimeEnvironment;
  47 import org.simantics.scl.compiler.top.ExpressionEvaluator;
  48 import org.simantics.scl.compiler.top.LocalStorage;
  49 import org.simantics.scl.compiler.top.SCLExpressionCompilationException;
  50 import org.simantics.scl.compiler.types.TCon;
  51 import org.simantics.scl.compiler.types.Type;
  52 import org.simantics.scl.compiler.types.Types;
  53 import org.simantics.scl.runtime.SCLContext;
  54 import org.simantics.scl.runtime.function.Function;
  55 import org.simantics.scl.runtime.function.FunctionImpl2;
  56 import org.simantics.scl.runtime.reporting.DelegatingSCLReportingHandler;
  57 import org.simantics.scl.runtime.reporting.SCLReporting;
  58 import org.simantics.scl.runtime.reporting.SCLReportingHandler;
  59 import org.simantics.scl.runtime.tuple.Tuple0;
  60
  61 import gnu.trove.map.hash.THashMap;
  62 import gnu.trove.procedure.TObjectProcedure;
  63 import gnu.trove.set.hash.THashSet;
  64
  65
  66 public class CommandSession {
  67
  68     ModuleRepository moduleRepository;
  69     SCLReportingHandler defaultHandler;
  70
  71     RuntimeEnvironment runtimeEnvironment;
  72     ValueToStringConverter valueToStringConverter;
  73
  74     ArrayList<CommandSessionImportEntry> importEntries = new ArrayList<CommandSessionImportEntry>();
  75
  76     THashMap<String,Object> variableValues = new THashMap<String,Object>();
  77     THashMap<String,Type> variableTypes = new THashMap<String,Type>();
  78
  79     PrintStream fileOutput;
  80
  81     private static final String CONTEXT_MODULE = "Expressions/Context";
  82     private static final TCon CONTEXT_TYPE = Types.con(CONTEXT_MODULE, "Context");
  83     private static final Name CONTEXT_GET = Name.create(CONTEXT_MODULE, "contextGet");
  84
  85     public CommandSession(ModuleRepository moduleRepository, SCLReportingHandler handler) {
  86         this.moduleRepository = moduleRepository;
  87         this.defaultHandler = new PrintDecorator(
  88                 handler == null ? SCLReportingHandler.DEFAULT : handler);
  89         updateRuntimeEnvironment(true);
  90     }
  91
  92     private static EnvironmentSpecification createEnvironmentSpecification(Collection<CommandSessionImportEntry> importEntries) {
  93         EnvironmentSpecification spec = new EnvironmentSpecification();
  94         spec.importModule("Builtin", "");
  95         spec.importModule("StandardLibrary", "");
  96         spec.importModule("Expressions/Context", null);
  97         for(CommandSessionImportEntry entry : importEntries)
  98             if(!entry.disabled && !entry.hasError)
  99                 spec.importModule(entry.moduleName, entry.localName);
 100         return spec;
 101     }
 102
 103     public void updateRuntimeEnvironment(boolean clearErrorsFlags) {
 104         if(clearErrorsFlags)
 105             for(CommandSessionImportEntry entry : importEntries)
 106                 entry.hasError = false;
 107         EnvironmentSpecification environmentSpecification = createEnvironmentSpecification(importEntries);
 108
 109         runtimeEnvironment = null;
 110         try {
 111             try {
 112                 runtimeEnvironment = moduleRepository.createRuntimeEnvironment(
 113                         environmentSpecification,
 114                         getClass().getClassLoader());
 115             } catch(ImportFailureException e) {
 116                 THashSet<String> failedModules = new THashSet<String>();
 117                 for(ImportFailure failure : e.failures) {
 118                     failedModules.add(failure.moduleName);
 119                     defaultHandler.printError(failure.toString());
 120                     if(failure.reason instanceof CompilationError[])
 121                         for(CompilationError error : (CompilationError[])failure.reason) {
 122                             defaultHandler.printError("    " + error.description);
 123                         }
 124                 }
 125                 for(CommandSessionImportEntry entry : importEntries)
 126                     if(failedModules.contains(entry.moduleName))
 127                         entry.hasError = true;
 128                 environmentSpecification = createEnvironmentSpecification(importEntries);
 129                 try {
 130                     runtimeEnvironment = moduleRepository.createRuntimeEnvironment(
 131                             environmentSpecification,
 132                             getClass().getClassLoader());
 133                 } catch (ImportFailureException e1) {
 134                     for(ImportFailure failure : e1.failures)
 135                         defaultHandler.printError(failure.toString());
 136                 }
 137             }
 138         } catch(RuntimeException e) {
 139             e.printStackTrace();
 140             throw e;
 141         }
 142         valueToStringConverter = new ValueToStringConverter(runtimeEnvironment);
 143     }
 144
 145     public RuntimeEnvironment getRuntimeEnvironment() {
 146         return runtimeEnvironment;
 147     }
 148
 149     public ModuleRepository getModuleRepository() {
 150         return moduleRepository;
 151     }
 152
 153     private static class CancelExecution extends RuntimeException {
 154         private static final long serialVersionUID = -6925642906311538873L;
 155     }
 156
 157     private LocalStorage localStorage = new LocalStorage() {
 158         @Override
 159         public void store(String name, Object value, Type type) {
 160             variableValues.put(name, value);
 161             variableTypes.put(name, type);
 162         }
 163     };
 164
 165     private static class LocalFunction {
 166         final Function function;
 167         final Type type;
 168
 169         public LocalFunction(Function function, Type type) {
 170             this.function = function;
 171             this.type = type;
 172         }
 173     }
 174
 175     private static final THashMap<String, LocalFunction> LOCAL_FUNCTIONS = new THashMap<String, LocalFunction>();
 176     static {
 177         LOCAL_FUNCTIONS.put("runFromFile", new LocalFunction(new FunctionImpl2<CommandSession, String, Tuple0>() {
 178             @Override
 179             public Tuple0 apply(final CommandSession commandSession, String fileName) {
 180                 SCLContext context = SCLContext.getCurrent();
 181                 commandSession.runFromFile(fileName, (SCLReportingHandler)context.get(SCLReportingHandler.REPORTING_HANDLER));
 182                 return Tuple0.INSTANCE;
 183             }
 184         }, Types.functionE(Types.STRING, Types.PROC, Types.UNIT)));
 185         LOCAL_FUNCTIONS.put("runTest", new LocalFunction(new FunctionImpl2<CommandSession, String, Tuple0>() {
 186             @Override
 187             public Tuple0 apply(final CommandSession commandSession, String fileName) {
 188                 SCLContext context = SCLContext.getCurrent();
 189                 SCLReportingHandler handler = (SCLReportingHandler)context.get(SCLReportingHandler.REPORTING_HANDLER);
 190                 try {
 191                     BufferedReader reader = new BufferedReader(new LaxUTF8Reader(fileName));
 192                     try {
 193                         new TestScriptExecutor(commandSession, reader, handler).execute();
 194                     } finally {
 195                         reader.close();
 196                     }
 197                 } catch(IOException e) {
 198                     handler.printError(e.getMessage());
 199                 }
 200                 return Tuple0.INSTANCE;
 201             }
 202         }, Types.functionE(Types.STRING, Types.PROC, Types.UNIT)));
 203         LOCAL_FUNCTIONS.put("reset", new LocalFunction(new FunctionImpl2<CommandSession, Tuple0, Tuple0>() {
 204             @Override
 205             public Tuple0 apply(CommandSession commandSession, Tuple0 _) {
 206                 commandSession.removeTransientImports();
 207                 commandSession.removeVariables();
 208                 commandSession.moduleRepository.getSourceRepository().checkUpdates();
 209                 commandSession.updateRuntimeEnvironment(true);
 210                 return Tuple0.INSTANCE;
 211             }
 212         }, Types.functionE(Types.UNIT, Types.PROC, Types.UNIT)));
 213         LOCAL_FUNCTIONS.put("variables", new LocalFunction(new FunctionImpl2<CommandSession, Tuple0, List<String>>() {
 214             @Override
 215             public List<String> apply(CommandSession commandSession, Tuple0 _) {
 216                 ArrayList<String> result = new ArrayList<String>(commandSession.variableTypes.keySet());
 217                 Collections.sort(result);
 218                 return result;
 219             }
 220         }, Types.functionE(Types.PUNIT, Types.PROC, Types.list(Types.STRING))));
 221         LOCAL_FUNCTIONS.put("startPrintingToFile", new LocalFunction(new FunctionImpl2<CommandSession, String, Tuple0>() {
 222             @Override
 223             public Tuple0 apply(final CommandSession commandSession, String fileName) {
 224                 try {
 225                     if(commandSession.fileOutput != null) {
 226                         commandSession.fileOutput.close();
 227                         SCLReporting.printError("Printing to file was already enabled. Stopped the previous printing.");
 228                     }
 229                     commandSession.fileOutput = new PrintStream(fileName, "UTF-8");
 230                 } catch (FileNotFoundException e) {
 231                     throw new RuntimeException(e);
 232                 } catch (UnsupportedEncodingException e) {
 233                     throw new RuntimeException(e);
 234                 }
 235                 return Tuple0.INSTANCE;
 236             }
 237         }, Types.functionE(Types.STRING, Types.PROC, Types.UNIT)));
 238         LOCAL_FUNCTIONS.put("startAppendingToFile", new LocalFunction(new FunctionImpl2<CommandSession, String, Tuple0>() {
 239             @Override
 240             public Tuple0 apply(final CommandSession commandSession, String fileName) {
 241                 try {
 242                     if(commandSession.fileOutput != null) {
 243                         commandSession.fileOutput.close();
 244                         SCLReporting.printError("Printing to file was already enabled. Stopped the previous printing.");
 245                     }
 246                     FileOutputStream stream = new FileOutputStream(fileName, true);
 247                     commandSession.fileOutput = new PrintStream(stream, false, "UTF-8");
 248                 } catch (FileNotFoundException e) {
 249                     throw new RuntimeException(e);
 250                 } catch (UnsupportedEncodingException e) {
 251                     throw new RuntimeException(e);
 252                 }
 253                 return Tuple0.INSTANCE;
 254             }
 255         }, Types.functionE(Types.STRING, Types.PROC, Types.UNIT)));
 256         LOCAL_FUNCTIONS.put("stopPrintingToFile", new LocalFunction(new FunctionImpl2<CommandSession, Tuple0, Tuple0>() {
 257             @Override
 258             public Tuple0 apply(final CommandSession commandSession, Tuple0 _) {
 259                 if(commandSession.fileOutput != null) {
 260                     commandSession.fileOutput.close();
 261                     commandSession.fileOutput = null;
 262                 }
 263                 return Tuple0.INSTANCE;
 264             }
 265         }, Types.functionE(Types.PUNIT, Types.PROC, Types.UNIT)));
 266     }
 267
 268     private LocalEnvironment createLocalEnvironment() {
 269         return new AbstractLocalEnvironment() {
 270             Variable contextVariable = new Variable("context", CONTEXT_TYPE);
 271             @Override
 272             public Expression resolve(Environment environment, String localName) {
 273                 Type type = variableTypes.get(localName);
 274                 if(type != null)
 275                     return new EApply(
 276                             new EConstant(environment.getValue(CONTEXT_GET), type),
 277                             new EVariable(contextVariable),
 278                             new ELiteral(new StringConstant(localName))
 279                             );
 280                 LocalFunction localFunction = LOCAL_FUNCTIONS.get(localName);
 281                 if(localFunction != null) {
 282                     return new EExternalConstant(
 283                             localFunction.function.apply(CommandSession.this),
 284                             localFunction.type);
 285                 }
 286                 return null;
 287             }
 288             @Override
 289             protected Variable[] getContextVariables() {
 290                 return new Variable[] { contextVariable };
 291             }
 292             @Override
 293             public void forNames(TObjectProcedure<String> proc) {
 294                 for(String name : variableTypes.keySet())
 295                     proc.execute(name);
 296                 for(String name : LOCAL_FUNCTIONS.keySet())
 297                     proc.execute(name);
 298             }
 299         };
 300     }
 301
 302     protected void removeTransientImports() {
 303         ArrayList<CommandSessionImportEntry> newEntries = new ArrayList<CommandSessionImportEntry>(importEntries.size());
 304         for(CommandSessionImportEntry entry : importEntries)
 305             if(entry.persistent)
 306                 newEntries.add(entry);
 307         importEntries = newEntries;
 308     }
 309
 310     public THashMap<String,Type> localNamesForContentProposals() {
 311         THashMap<String,Type> result = new THashMap<String,Type>();
 312         for(Map.Entry<String,LocalFunction> entry : LOCAL_FUNCTIONS.entrySet())
 313             result.put(entry.getKey(), entry.getValue().type);
 314         result.putAll(variableTypes);
 315         return result;
 316     }
 317
 318     private CompiledCommand compile(Expression expression) throws SCLExpressionCompilationException {
 319         LocalEnvironment localEnvironment = createLocalEnvironment();
 320         if(runtimeEnvironment == null)
 321             throw new SCLExpressionCompilationException(new CompilationError[] {
 322                new CompilationError("Compilation failed: imports in the current environment have failed.")
 323             });
 324         ExpressionEvaluator evaluator = new ExpressionEvaluator(runtimeEnvironment, localStorage, expression);
 325         Function command = (Function)evaluator
 326             .localEnvironment(localEnvironment)
 327             .decorateExpression(true)
 328             .eval();
 329         return new CompiledCommand(command, evaluator.getType());
 330     }
 331
 332     class PrintDecorator extends DelegatingSCLReportingHandler {
 333         public PrintDecorator(SCLReportingHandler baseHandler) {
 334             super(baseHandler);
 335         }
 336
 337         @Override
 338         public void print(String text) {
 339             super.print(text);
 340             if(fileOutput != null)
 341                 fileOutput.println(text);
 342         }
 343
 344         @Override
 345         public void printCommand(String command) {
 346             super.printCommand(command);
 347             if(fileOutput != null)
 348                 fileOutput.println("> " + command);
 349         }
 350
 351         @Override
 352         public void printError(String error) {
 353             super.printError(error);
 354             if(fileOutput != null)
 355                 fileOutput.println(error);
 356         }
 357     }
 358
 359     @SuppressWarnings("unchecked")
 360     private void execute(MemoReader reader, Expression expression, final SCLReportingHandler handler) {
 361         SCLContext context = SCLContext.getCurrent();
 362         Object oldPrinter = context.put(SCLReportingHandler.REPORTING_HANDLER, handler);
 363         try {
 364             CompiledCommand command;
 365             try {
 366                 handler.printCommand(reader.extractString(expression.location));
 367                 command = compile(expression);
 368             } catch (SCLExpressionCompilationException e) {
 369                 CompilationError[] errors = ((SCLExpressionCompilationException)e).getErrors();
 370                 for(CompilationError error : errors) {
 371                     if(error.location != Locations.NO_LOCATION)
 372                         handler.printError(reader.locationUnderlining(error.location));
 373                     handler.printError(error.description);
 374                 }
 375                 throw new CancelExecution();
 376             }
 377             reader.forgetEverythingBefore(Locations.endOf(expression.location));
 378
 379             Object resultValue = command.command.apply(variableValues);
 380             String resultString = toString(resultValue, command.type);
 381             if(!resultString.isEmpty())
 382                 handler.print(resultString);
 383         } catch(Exception e) {
 384             if(!(e instanceof CancelExecution)) {
 385                 if(e instanceof InterruptedException)
 386                     handler.printError("Execution interrupted.");
 387                 else
 388                     formatException(handler, e);
 389             }
 390             throw new CancelExecution();
 391         } finally {
 392             context.put(SCLReportingHandler.REPORTING_HANDLER, oldPrinter);
 393         }
 394     }
 395
 396     private String toString(Object value, Type type) {
 397         if(type.equals(Types.UNIT))
 398             return "";
 399         try {
 400             return valueToStringConverter.show(value, type);
 401         } catch (SCLExpressionCompilationException e) {
 402             return "<value of type " + type + ">";
 403         }
 404     }
 405
 406     class CommandParser extends SCLParserImpl {
 407         SCLReportingHandler handler;
 408         MemoReader reader;
 409         public CommandParser(SCLReportingHandler handler, MemoReader reader) {
 410             super(reader);
 411             this.reader = reader;
 412             this.handler = handler;
 413         }
 414
 415         EBlock currentBlock;
 416         void finishBlock() {
 417             if(currentBlock != null) {
 418                 checkInterrupted();
 419                 LinkedList<Statement> statements = currentBlock.getStatements();
 420                 currentBlock.location = Locations.combine(
 421                         statements.getFirst().location,
 422                         statements.getLast().location);
 423                 execute(reader, currentBlock, handler);
 424                 currentBlock = null;
 425             }
 426         }
 427         @Override
 428         protected Object reduceStatementCommand() {
 429             Statement statement = (Statement)get(0);
 430             if(statement.mayBeRecursive()) {
 431                 if(currentBlock == null)
 432                     currentBlock = new EBlock();
 433                 currentBlock.addStatement(statement);
 434             }
 435             else {
 436                 finishBlock();
 437                 checkInterrupted();
 438                 if(statement instanceof GuardStatement)
 439                     execute(reader, ((GuardStatement)statement).value, handler);
 440                 else {
 441                     EBlock block = new EBlock();
 442                     block.addStatement(statement);
 443                     block.location = statement.location;
 444                     execute(reader, block, handler);
 445                 }
 446             }
 447             return null;
 448         }
 449
 450         @Override
 451         protected Object reduceImportCommand() {
 452             finishBlock();
 453             checkInterrupted();
 454
 455             ImportDeclaration importDeclaration = (ImportDeclaration)get(0);
 456             handler.printCommand(reader.extractString(importDeclaration.location));
 457             new CommandSessionImportEntry(importDeclaration.moduleName,
 458                     importDeclaration.localName).addTo(importEntries);
 459             updateRuntimeEnvironment(false);
 460             return null;
 461         }
 462     }
 463
 464     private void checkInterrupted() {
 465         if(Thread.interrupted()) {
 466             defaultHandler.printError("Execution interrupted.");
 467             throw new CancelExecution();
 468         }
 469     }
 470
 471     public void execute(Reader commandReader, SCLReportingHandler handler) {
 472         if(handler == null)
 473             handler = defaultHandler;
 474         else if (!(handler instanceof PrintDecorator))
 475             handler = new PrintDecorator(handler);
 476         CommandParser parser = new CommandParser(handler, new MemoReader(commandReader));
 477         try {
 478             parser.parseCommands();
 479             parser.finishBlock();
 480         } catch(CancelExecution e) {
 481         } catch(SCLSyntaxErrorException e) {
 482             handler.printCommand(parser.reader.getLastCommand());
 483             if(e.location != Locations.NO_LOCATION)
 484                 handler.printError(parser.reader.locationUnderlining(e.location));
 485             handler.printError(e.getMessage());
 486         } catch(Exception e) {
 487             if(e instanceof InterruptedException)
 488                 handler.printError("Execution interrupted.");
 489             else
 490                 formatException(handler, e);
 491         }
 492     }
 493
 494     public void execute(String command) {
 495         execute(new StringReader(command), null);
 496     }
 497
 498     public void execute(String command, SCLReportingHandler handler) {
 499         execute(new StringReader(command), handler);
 500     }
 501
 502     public CompilationError[] validate(String command) {
 503         return CompilationError.EMPTY_ARRAY;
 504         /*try {
 505             compile(command);
 506             return CompilationError.EMPTY_ARRAY;
 507         } catch(SCLExpressionCompilationException e) {
 508             return e.getErrors();
 509         }*/
 510     }
 511
 512     private static final String THIS_CLASS_NAME = CommandSession.class.getName();
 513
 514     public static void formatException(
 515             SCLReportingHandler handler,
 516             Throwable e) {
 517         formatException(handler, null, e);
 518     }
 519
 520     private static void formatException(
 521             SCLReportingHandler handler,
 522             StackTraceElement[] enclosingTrace,
 523             Throwable e) {
 524         StackTraceElement[] elements = e.getStackTrace();
 525         Throwable cause = e.getCause();
 526         if(cause != null) {
 527             formatException(handler, elements, cause);
 528             handler.printError("Rethrown as ");
 529         }
 530         handler.printError(e.toString());
 531         int endPos = elements.length;
 532         if(enclosingTrace != null) {
 533             int p = enclosingTrace.length;
 534             while(endPos > 0 && p > 0 && elements[endPos-1].equals(enclosingTrace[p-1])) {
 535                 --p;
 536                 --endPos;
 537             }
 538         }
 539         else {
 540             for(int i=0;i<endPos;++i) {
 541                 StackTraceElement element = elements[i];
 542                 if(element.getMethodName().equals("execute") &&
 543                         element.getClassName().equals(THIS_CLASS_NAME)) {
 544                     endPos = i;
 545                     while(endPos > 0) {
 546                         element = elements[endPos-1];
 547                         String className = element.getClassName();
 548                         if(className.startsWith("org.simantics.scl.compiler.top.SCLExpressionCompiler")
 549                                 //|| element.getClassName().startsWith("org.simantics.scl.compiler.interpreted.")
 550                                 || className.startsWith("org.simantics.scl.runtime.function.FunctionImpl")
 551                                 //|| className.startsWith("tempsclpackage")
 552                                 )
 553                             --endPos;
 554                         else
 555                             break;
 556                     }
 557                     break;
 558                 }
 559             }
 560         }
 561         for(int i=0;i<endPos;++i) {
 562             StringBuilder b = new StringBuilder();
 563             StackTraceElement element = elements[i];
 564             String className = element.getClassName();
 565             if(className.equals("org.simantics.scl.compiler.interpreted.IApply")
 566                     || className.equals("org.simantics.scl.compiler.interpreted.ILet")
 567                     || className.startsWith("tempsclpackage"))
 568                 continue;
 569             if(className.startsWith("org.simantics.scl.compiler.interpreted.ILambda")) {
 570                 b.append("\tat command line\n");
 571                 continue;
 572             }
 573             String methodName = element.getMethodName();
 574             if(className.startsWith("org.simantics.scl.runtime.function.FunctionImpl") &&
 575                     methodName.equals("applyArray"))
 576                 continue;
 577             String fileName = element.getFileName();
 578             if("_SCL_Closure".equals(fileName))
 579                 continue;
 580             b.append("\tat ");
 581             if("_SCL_Module".equals(fileName)
 582                     || "_SCL_TypeClassInstance".equals(fileName))
 583                 b.append(NameMangling.demangle(methodName))
 584                 .append('(').append(element.getLineNumber()).append(')');
 585             else
 586                 b.append(element);
 587             handler.printError(b.toString());
 588         }
 589     }
 590
 591     public void setVariable(String name, Type type, Object value) {
 592         variableValues.put(name, value);
 593         variableTypes.put(name, type);
 594     }
 595
 596     public Object getVariableValue(String name) {
 597         return variableValues.get(name);
 598     }
 599
 600     public Type getVariableType(String name) {
 601         return variableTypes.get(name);
 602     }
 603
 604     public void removeVariable(String name) {
 605         variableValues.remove(name);
 606         variableTypes.remove(name);
 607     }
 608
 609     public void removeVariables() {
 610         variableValues.clear();
 611         variableTypes.clear();
 612     }
 613
 614     public Set<String> getVariables() {
 615         return variableTypes.keySet();
 616     }
 617
 618     public ArrayList<CommandSessionImportEntry> getImportEntries() {
 619         return importEntries;
 620     }
 621
 622     public void setImportEntries(
 623             ArrayList<CommandSessionImportEntry> importEntries) {
 624         this.importEntries = importEntries;
 625         updateRuntimeEnvironment(true);
 626     }
 627
 628     public void runFromFile(String fileName, SCLReportingHandler handler) {
 629         try {
 630             Reader reader = new LaxUTF8Reader(fileName);
 631             try {
 632                 execute(reader, handler);
 633             } finally {
 634                 reader.close();
 635             }
 636         } catch(IOException e) {
 637             formatException(handler, e);
 638         }
 639     }
 640 }