Examples of org.mvel2.util.ASTIterator

org.mvel2.util.SimpleVariableSpaceModel
The ASTIterator interface defines the functionality required by the enginer, for compiletime and runtime operations. Unlike other script implementations, MVEL does not use a completely normalized AST tree for it's execution. Instead, nodes are organized into a linear order and delivered via this iterator interface, much like bytecode instructions.

    protected static String JAVA_RULE_MVEL             = "javaRule.mvel";
    protected static String JAVA_INVOKERS_MVEL         = "javaInvokers.mvel";


    public static void setConsequenceTemplate( String name ) {
        JAVA_RULE_MVEL = name;
        RULE_REGISTRY = new SimpleTemplateRegistry();
    }

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        RULE_REGISTRY = new SimpleTemplateRegistry();
    }


    public static void setInvokerTemplate( String name ) {
        JAVA_INVOKERS_MVEL = name;
        INVOKER_REGISTRY = new SimpleTemplateRegistry();
    }

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                                 final ProcessBuildContext context,
                                 final String className,
                                 final Map vars,
                                 final Object invokerLookup,
                                 final BaseDescr descrLookup) {
        TemplateRegistry registry = getRuleTemplateRegistry();


        context.getMethods().add(
                TemplateRuntime.execute(registry.getNamedTemplate(ruleTemplate), null, new MapVariableResolverFactory(vars), registry)
        );


        registry = getInvokerTemplateRegistry();
        final String invokerClassName = context.getPkg().getName() + "." + context.getProcessDescr().getClassName() + StringUtils.ucFirst(className) + "Invoker";


        context.getInvokers().put(invokerClassName,
                TemplateRuntime.execute(registry.getNamedTemplate(invokerTemplate), null, new MapVariableResolverFactory(vars), registry)
        );


        context.getInvokerLookups().put(invokerClassName,
                invokerLookup);
        context.getDescrLookups().put(invokerClassName,

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        generateMethodTemplate(ruleTemplate, context, vars);
        generateInvokerTemplate(invokerTemplate, context, className, vars, invokerLookup, descrLookup);
    }


    public static void generateMethodTemplate(final String ruleTemplate, final RuleBuildContext context, final Map vars) {
        TemplateRegistry registry = getRuleTemplateRegistry(context.getPackageBuilder().getRootClassLoader());


        context.addMethod((String) TemplateRuntime.execute( registry.getNamedTemplate(ruleTemplate),
                                                            null,
                                                            new MapVariableResolverFactory(vars),
                                                            registry) );
    }

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                                               final RuleBuildContext context,
                                               final String className,
                                               final Map vars,
                                               final Object invokerLookup,
                                               final BaseDescr descrLookup) {
        TemplateRegistry registry = getInvokerTemplateRegistry(context.getPackageBuilder().getRootClassLoader());
        final String invokerClassName = context.getPkg().getName() + "." + context.getRuleDescr().getClassName() + StringUtils.ucFirst( className ) + "Invoker";


        context.getInvokers().put( invokerClassName,
                                   (String) TemplateRuntime.execute( registry.getNamedTemplate( invokerTemplate ),
                                                                     null,
                                                                     new MapVariableResolverFactory( vars ),
                                                                     registry ) );


        context.getInvokerLookups().put( invokerClassName,

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  private static final class DecompileContext {
    public int node = 0;
  }


  private static String decompile(CompiledExpression cExp, boolean nest, DecompileContext context) {
    ASTIterator iter = new ASTLinkedList(cExp.getFirstNode());
    ASTNode tk;


    StringBuffer sbuf = new StringBuffer();


    if (!nest) {
      sbuf.append("Expression Decompile\n-------------\n");
    }


    while (iter.hasMoreNodes()) {
      sbuf.append("(").append(context.node++).append(") ");


      if ((tk = iter.nextNode()) instanceof NestedStatement
          && ((NestedStatement) tk).getNestedStatement() instanceof CompiledExpression) {
        //noinspection StringConcatenationInsideStringBufferAppend
        sbuf.append("NEST [" + tk.getClass().getSimpleName() + "]: { " + tk.getName() + " }\n");
        sbuf.append(decompile((CompiledExpression) ((NestedStatement) tk).getNestedStatement(), true, context));
      }

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    return "UNKNOWN_OPERATOR";
  }


  public static Class determineType(String name, CompiledExpression compiledExpression) {
    ASTIterator iter = new ASTLinkedList(compiledExpression.getFirstNode());
    ASTNode node;
    while (iter.hasMoreNodes()) {
      if (name.equals((node = iter.nextNode()).getName()) && node.isAssignment()) {
        return node.getEgressType();
      }
    }


    return null;

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  private static final class DecompileContext {
    public int node = 0;
  }


  private static String decompile(CompiledExpression cExp, boolean nest, DecompileContext context) {
    ASTIterator iter = new ASTLinkedList(cExp.getFirstNode());
    ASTNode tk;


    StringBuffer sbuf = new StringBuffer();


    if (!nest) {
      sbuf.append("Expression Decompile\n-------------\n");
    }


    while (iter.hasMoreNodes()) {
      sbuf.append("(").append(context.node++).append(") ");


      if ((tk = iter.nextNode()) instanceof NestedStatement
          && ((NestedStatement) tk).getNestedStatement() instanceof CompiledExpression) {
        //noinspection StringConcatenationInsideStringBufferAppend
        sbuf.append("NEST [" + tk.getClass().getSimpleName() + "]: { " + tk.getName() + " }\n");
        sbuf.append(decompile((CompiledExpression) ((NestedStatement) tk).getNestedStatement(), true, context));
      }

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    return "UNKNOWN_OPERATOR";
  }


  public static Class determineType(String name, CompiledExpression compiledExpression) {
    ASTIterator iter = new ASTLinkedList(compiledExpression.getFirstNode());
    ASTNode node;
    while (iter.hasMoreNodes()) {
      if (name.equals((node = iter.nextNode()).getName()) && node.isAssignment()) {
        return node.getEgressType();
      }
    }


    return null;

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        String[] allVars = new String[varNames.length + locals.length];


        System.arraycopy(varNames, 0, allVars, 0, varNames.length);
        System.arraycopy(locals, 0, allVars, varNames.length, locals.length);        
        
        this.varModel = new SimpleVariableSpaceModel(allVars);
        this.allVarsLength = allVars.length;
        
        return stmt;
    }

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