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package com.oracle.truffle.polyglot;

import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.frame.Frame;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.UnknownIdentifierException;
import com.oracle.truffle.api.library.ExportLibrary;
import com.oracle.truffle.api.library.ExportMessage;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.RootNode;

A default frame slot based implementation of variables contained in the (default) frame scope.
/** * A default frame slot based implementation of variables contained in the (default) frame scope. */
@SuppressWarnings("deprecation") abstract class LegacyDefaultScope implements Iterable<com.oracle.truffle.api.Scope> { private List<com.oracle.truffle.api.Scope> scopeList; @Override public Iterator<com.oracle.truffle.api.Scope> iterator() { List<com.oracle.truffle.api.Scope> list = scopeList; if (list == null) { scopeList = list = Collections.singletonList(createScope()); } return list.iterator(); } abstract com.oracle.truffle.api.Scope createScope(); static Iterable<com.oracle.truffle.api.Scope> topScope(Object global) { return new LegacyDefaultScope() { @Override com.oracle.truffle.api.Scope createScope() { Object globalObject; if (global != null && InteropLibrary.getUncached().hasMembers(global)) { globalObject = global; } else { globalObject = new EmptyGlobalBindings(); } return com.oracle.truffle.api.Scope.newBuilder("global", globalObject).build(); } }; } static Iterable<com.oracle.truffle.api.Scope> lexicalScope(Node node, Frame frame, Class<? extends TruffleLanguage<?>> language) { return new LegacyDefaultScope() { @Override com.oracle.truffle.api.Scope createScope() { RootNode root = node.getRootNode(); String name = root.getName(); if (name == null) { name = "local"; } return com.oracle.truffle.api.Scope.newBuilder(name, DefaultScope.getVariables(root, frame, language)).node(root).arguments( DefaultScope.getArguments((frame != null) ? frame.getArguments() : new Object[0], language)).build(); } }; } @ExportLibrary(InteropLibrary.class) @SuppressWarnings("static-method") static final class EmptyGlobalBindings implements TruffleObject { EmptyGlobalBindings() { } @SuppressWarnings("static-method") @ExportMessage boolean hasMembers() { return true; } @ExportMessage Object readMember(String member) throws UnknownIdentifierException { throw UnknownIdentifierException.create(member); } @ExportMessage Object getMembers(@SuppressWarnings("unused") boolean includeInternal) { return DefaultScope.VariableNamesObject.EMPTY; } @ExportMessage boolean isMemberReadable(@SuppressWarnings("unused") String member) { return false; } } }