Examples with ComprehensionFor com.github.anba.es6draft.ast.ComprehensionFor used on opensource projects

Example 1 with ComprehensionFor

use of com.github.anba.es6draft.ast.ComprehensionFor in project es6draft by anba.

the class ComprehensionGenerator method visit.

/**
     * Runtime Semantics: ComprehensionComponentEvaluation
     * <p>
     * ComprehensionFor : for ( ForBinding of AssignmentExpression )
     */
@Override
public Void visit(ComprehensionFor node, CodeVisitor mv) {
    Jump lblTest = new Jump(), lblLoop = new Jump();
    Variable<ScriptIterator<?>> iter = iterators.next();
    /* steps 1-2 */
    expressionBoxed(node.getExpression(), mv);
    /* steps 3-4 */
    mv.loadExecutionContext();
    mv.lineInfo(node.getExpression());
    mv.invoke(Methods.ScriptRuntime_iterate);
    mv.store(iter);
    /* step 5 (not applicable) */
    /* step 6 */
    mv.nonDestructiveGoTo(lblTest);
    /* steps 6.d-e */
    mv.mark(lblLoop);
    mv.load(iter);
    mv.lineInfo(node);
    mv.invoke(Methods.Iterator_next);
    /* steps 6.f-j */
    BlockScope scope = node.getScope();
    if (scope.isPresent()) {
        mv.enterVariableScope();
        Variable<LexicalEnvironment<DeclarativeEnvironmentRecord>> env = mv.newVariable("env", LexicalEnvironment.class).uncheckedCast();
        Variable<DeclarativeEnvironmentRecord> envRec = mv.newVariable("envRec", DeclarativeEnvironmentRecord.class);
        // stack: [nextValue] -> []
        Variable<Object> nextValue = mv.newVariable("nextValue", Object.class);
        mv.store(nextValue);
        newDeclarativeEnvironment(scope, mv);
        mv.store(env);
        getEnvRec(env, envRec, mv);
        for (Name name : BoundNames(node.getBinding())) {
            BindingOp<DeclarativeEnvironmentRecord> op = BindingOp.of(envRec, name);
            op.createMutableBinding(envRec, name, false, mv);
        }
        BindingInitialization(codegen, envRec, node.getBinding(), nextValue, mv);
        mv.load(env);
        pushLexicalEnvironment(mv);
        mv.exitVariableScope();
    } else {
        // stack: [nextValue] -> []
        mv.pop();
    }
    /* step 6.k */
    mv.enterScope(node);
    new IterationGenerator<ComprehensionFor>(codegen) {

        @Override
        protected Completion iterationBody(ComprehensionFor node, Variable<ScriptIterator<?>> iterator, CodeVisitor mv) {
            elements.next().accept(ComprehensionGenerator.this, mv);
            return Completion.Normal;
        }

        @Override
        protected MutableValue<Object> enterIteration(ComprehensionFor node, CodeVisitor mv) {
            return mv.enterIteration();
        }

        @Override
        protected List<TempLabel> exitIteration(ComprehensionFor node, CodeVisitor mv) {
            return mv.exitIteration();
        }
    }.generate(node, iter, mv);
    mv.exitScope();
    /* steps 6.l-m */
    if (scope.isPresent()) {
        popLexicalEnvironment(mv);
    }
    /* steps 6.a-c */
    mv.mark(lblTest);
    mv.load(iter);
    mv.lineInfo(node);
    mv.invoke(Methods.Iterator_hasNext);
    mv.ifne(lblLoop);
    return null;
}

Example 2 with ComprehensionFor

use of com.github.anba.es6draft.ast.ComprehensionFor in project es6draft by anba.

the class ComprehensionGenerator method visit.

/**
     * Runtime Semantics: ComprehensionEvaluation
     */
@Override
public Void visit(Comprehension node, CodeVisitor mv) {
    ArrayList<Node> list = new ArrayList<>(node.getList().size() + 1);
    list.addAll(node.getList());
    list.add(node.getExpression());
    elements = list.iterator();
    // Create variables early so they'll appear next to each other in the local variable map.
    ArrayList<Variable<ScriptIterator<?>>> iters = new ArrayList<>();
    for (ComprehensionQualifier e : node.getList()) {
        if (e instanceof ComprehensionFor || e instanceof LegacyComprehensionFor) {
            Variable<ScriptIterator<?>> iter = mv.newVariable("iter", ScriptIterator.class).uncheckedCast();
            iters.add(iter);
        }
    }
    iterators = iters.iterator();
    // Start generating code.
    elements.next().accept(this, mv);
    return null;
}