Examples of org.jruby.parser.StaticScope

org.jruby.parser.StaticScope
StaticScope represents lexical scoping of variables and module/class constants. At a very high level every scopes enclosing scope contains variables in the next outer lexical layer. The enclosing scopes variables may or may not be reachable depending on the scoping rules for variables (governed by BlockStaticScope and LocalStaticScope). StaticScope also keeps track of current module/class that is in scope. previousCRefScope will point to the previous scope of the enclosing module/class (cref).

        YARVMachine ym = new YARVMachine();
        
        Ruby runtime = Ruby.newInstance(System.in, System.out, System.err);
        ThreadContext context = runtime.getCurrentContext();
        
        StaticScope scope = new LocalStaticScope(null);
        scope.setVariables(new String[] {"n", "i", "j", "cur", "k"});
        assertEquals("55", ym.exec(context, scope, getFib(runtime,10)).toString());
        
        IRubyObject fib5k = ym.exec(context, scope, getFib(runtime,5000));
        assertEquals("38789684543883256337019163083259053120821277146462451061605972148955501390440370" +
                "9701082291646221066947929345285888297381348310200895498294036143015691147893836421656" +

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        compileRoot(node, context, inspector, true, true);
    }


    public void compileRoot(Node node, ScriptCompiler context, ASTInspector inspector, boolean load, boolean main) {
        RootNode rootNode = (RootNode) node;
        StaticScope staticScope = rootNode.getStaticScope();


        context.startScript(staticScope);


        // force static scope to claim restarg at 0, so it only implements the [] version of __file__
        staticScope.setRestArg(-2);


        // create method for toplevel of script
        BodyCompiler methodCompiler = context.startFileMethod(null, staticScope, inspector);


        Node nextNode = rootNode.getBodyNode();

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        block = procBlock.cloneBlock();


        if (isThread()) {
            // modify the block with a new backref/lastline-grabbing scope
            StaticScope oldScope = block.getBody().getStaticScope();
            StaticScope newScope = new BlockStaticScope(oldScope.getEnclosingScope(), oldScope.getVariables());
            newScope.setBackrefLastlineScope(true);
            newScope.setPreviousCRefScope(oldScope.getPreviousCRefScope());
            newScope.setModule(oldScope.getModule());
            block.getBody().setStaticScope(newScope);
        }


        // force file/line info into the new block's binding
        block.getBinding().setFile(block.getBody().getFile());

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        this.runtimeCache = runtime.getRuntimeCache();
        
        // TOPLEVEL self and a few others want a top-level scope.  We create this one right
        // away and then pass it into top-level parse so it ends up being the top level.
        StaticScope topStaticScope = new LocalStaticScope(null);
        pushScope(new ManyVarsDynamicScope(topStaticScope, null));


        Frame[] stack = frameStack;
        int length = stack.length;
        for (int i = 0; i < length; i++) {

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    public void preExecuteUnder(RubyModule executeUnderClass, Block block) {
        Frame frame = getCurrentFrame();
        
        pushRubyClass(executeUnderClass);
        DynamicScope scope = getCurrentScope();
        StaticScope sScope = new BlockStaticScope(scope.getStaticScope());
        sScope.setModule(executeUnderClass);
        pushScope(DynamicScope.newDynamicScope(sScope, scope));
        pushCallFrame(frame.getKlazz(), frame.getName(), frame.getSelf(), block);
        getCurrentFrame().setVisibility(getPreviousFrame().getVisibility());
    }

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    static ManyVarsDynamicScope getManyVarsDynamicScope(ScriptingContainer container, int depth) {
        ManyVarsDynamicScope scope;


        // root our parsing scope with a dummy scope
        StaticScope topStaticScope = new LocalStaticScope(null);
        topStaticScope.setModule(container.getProvider().getRuntime().getObject());


        DynamicScope currentScope = new ManyVarsDynamicScope(topStaticScope, null);
        String[] names4Injection = container.getVarMap().getLocalVarNames();
        if (names4Injection == null || names4Injection.length == 0) {
            scope =

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        // which is capable of having a non-empty dynamic scope).
        if (scope == null) {
            scope = DynamicScope.newDynamicScope(staticScope);
        }
        
        StaticScope theStaticScope = scope.getStaticScope();
        
        // Each root node has a top-level scope that we need to push
        context.preScopedBody(scope);
        
        if (theStaticScope.getModule() == null) {
            theStaticScope.setModule(runtime.getObject());
        }


        try {
            return bodyNode.interpret(runtime, context, self, aBlock);
        } finally {

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        Block block = proc.getBlock();
        block.getBinding().getFrame().setKlazz(this);
        block.getBinding().getFrame().setName(name);
        block.getBinding().setMethod(name);
        
        StaticScope scope = block.getBody().getStaticScope();


        // for zsupers in define_method (blech!) we tell the proc scope to act as the "argument" scope
        scope.makeArgumentScope();


        Arity arity = block.arity();
        // just using required is broken...but no more broken than before zsuper refactoring
        scope.setRequiredArgs(arity.required());


        if(!arity.isFixed()) {
            scope.setRestArg(arity.required());
        }


        return new ProcMethod(this, proc, visibility);
    }

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     */
    @JRubyMethod(name = "nesting", frame = true, meta = true)
    public static RubyArray nesting(ThreadContext context, IRubyObject recv, Block block) {
        Ruby runtime = context.getRuntime();
        RubyModule object = runtime.getObject();
        StaticScope scope = context.getCurrentScope().getStaticScope();
        RubyArray result = runtime.newArray();
        
        for (StaticScope current = scope; current.getModule() != object; current = current.getPreviousCRefScope()) {
            result.append(current.getModule());
        }

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        }
    }
    
    @JRubyMethod
    public IRubyObject to_proc(ThreadContext context) {
        StaticScope scope = new LocalStaticScope(null);
        
        BlockBody body = new ContextAwareBlockBody(scope, Arity.OPTIONAL, BlockBody.SINGLE_RESTARG) {
            @Override
            public IRubyObject yield(ThreadContext context, IRubyObject value, Binding binding, Type type) {
                RubyArray array = ArgsUtil.convertToRubyArray(context.getRuntime(), value, false);

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