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).

        // init errorInfo to nil
        errorInfo = runtime.getNil();
        
        // 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));
            
        for (int i = 0; i < frameStack.length; i++) {
            frameStack[i] = new Frame();
        }

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    public void preCompiledClass(RubyModule type, String[] scopeNames) {
        pushRubyClass(type);
        pushFrameCopy();
        getCurrentFrame().setSelf(type);
        getCurrentFrame().setVisibility(Visibility.PUBLIC);
        StaticScope staticScope = new LocalStaticScope(getCurrentScope().getStaticScope(), scopeNames);
        staticScope.setModule(type);
        pushScope(new ManyVarsDynamicScope(staticScope, null));
    }

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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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        // 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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        return factory.getBlockCallback(closureMethod, scriptObject);
    }
    
    public static BlockBody createCompiledBlockBody(ThreadContext context, Object scriptObject, String closureMethod, int arity, 
            String[] staticScopeNames, boolean hasMultipleArgsHead, int argsNodeType, boolean light) {
        StaticScope staticScope = 
            new BlockStaticScope(context.getCurrentScope().getStaticScope(), staticScopeNames);
        staticScope.determineModule();
        
        if (light) {
            return CompiledBlockLight.newCompiledBlockLight(
                    Arity.createArity(arity), staticScope,
                    createBlockCallback(context.getRuntime(), scriptObject, closureMethod),

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                self,
                body);
    }
    
    public static IRubyObject runBeginBlock(ThreadContext context, IRubyObject self, String[] staticScopeNames, CompiledBlockCallback callback) {
        StaticScope staticScope = 
            new BlockStaticScope(context.getCurrentScope().getStaticScope(), staticScopeNames);
        staticScope.determineModule();
        
        context.preScopedBody(DynamicScope.newDynamicScope(staticScope, context.getCurrentScope()));
        
        Block block = CompiledBlock.newCompiledClosure(context, self, Arity.createArity(0), staticScope, callback, false, BlockBody.ZERO_ARGS);

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        RubyModule containingClass = context.getRubyClass();
        Visibility visibility = context.getCurrentVisibility();
        
        performNormalMethodChecks(containingClass, runtime, name);
        
        StaticScope scope = creatScopeForClass(context, scopeNames, required, optional, rest);
        
        MethodFactory factory = MethodFactory.createFactory(compiledClass.getClassLoader());
        DynamicMethod method = constructNormalMethod(name, visibility, factory, containingClass, javaName, arity, scope, scriptObject, callConfig);
        
        addInstanceMethod(containingClass, name, method, visibility,context, runtime);

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        Class compiledClass = scriptObject.getClass();
        Ruby runtime = context.getRuntime();


        RubyClass rubyClass = performSingletonMethodChecks(runtime, receiver, name);
        
        StaticScope scope = creatScopeForClass(context, scopeNames, required, optional, rest);
        
        MethodFactory factory = MethodFactory.createFactory(compiledClass.getClassLoader());
        DynamicMethod method = constructSingletonMethod(factory, rubyClass, javaName, arity, scope,scriptObject, callConfig);
        
        rubyClass.addMethod(name, method);

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        if (value == null) return nil;
        return RubyString.newString(runtime, value);
    }
    
    public static void preLoad(ThreadContext context, String[] varNames) {
        StaticScope staticScope = new LocalStaticScope(null, varNames);
        staticScope.setModule(context.getRuntime().getObject());
        DynamicScope scope = DynamicScope.newDynamicScope(staticScope);
        
        // Each root node has a top-level scope that we need to push
        context.preScopedBody(scope);
    }

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        return factory.getCompiledMethodLazily(rubyClass, javaName, Arity.createArity(arity), Visibility.PUBLIC, scope, scriptObject, callConfig);
    }


    private static StaticScope creatScopeForClass(ThreadContext context, String[] scopeNames, int required, int optional, int rest) {


        StaticScope scope = new LocalStaticScope(context.getCurrentScope().getStaticScope(), scopeNames);
        scope.determineModule();
        scope.setArities(required, optional, rest);


        return scope;
    }

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