checklocalelements.java

是一款用JAVA 编写的编译器 具有很强的编译功能

/*
 * Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/*
 * @test
 * @bug 6402516
 * @summary need Trees.getScope(TreePath)
 * @build Checker CheckLocalElements
 * @run main CheckLocalElements
 */

import java.util.*;
import com.sun.source.tree.*;
import javax.lang.model.element.*;
import javax.lang.model.util.*;

/*
 * Check the local elements of a scope against the contents of string literals.
 */
public class CheckLocalElements extends Checker {
    public static void main(String... args) throws Exception {
        Checker chk = new CheckLocalElements();
	chk.check("TestLocalElements.java");
    }

    @Override
    protected boolean checkLocal(Scope s, String ref) {
	Iterator<? extends Element> elemIter = s.getLocalElements().iterator();
	ref = ref.trim();
	String[] refs = ref.length() == 0 ? new String[0] : ref.split("[ ]*,[ ]*", -1);
	Iterator<String> refIter = Arrays.asList(refs).iterator();
	String r = null;

	nextElem:
	while (elemIter.hasNext()) {
	    Element e = elemIter.next();
	    try {
		if (r == null) 
		    r = refIter.next();

		while (r.endsWith(".*")) {
		    String encl = getEnclosingName(e);
		    String rBase = r.substring(0, r.length() - 2);
		    if (encl.equals(rBase) || encl.startsWith(rBase + "."))
			continue nextElem;
		    r = refIter.next();
		}

		if (r.equals("-") && (e.getSimpleName().length() == 0)
		    || e.getSimpleName().toString().equals(r)) {
		    r = null;
		    continue nextElem;
		}

		error(s, ref, "mismatch: " + e.getSimpleName() + " " + r);
		return false;

	    } catch (NoSuchElementException ex) { // from refIter.next()
		error(s, null, "scope has unexpected entry: " + e.getSimpleName());
		return false;
	    }

	}

	if (refIter.hasNext()) {
	    error(s, ref, "scope is missing entry: " + refIter.next()); 
	    return false;
	}

	return true;
    }

    private String getEnclosingName(Element e) {
	Element encl = e.getEnclosingElement();
	return encl == null ? "" : encl.accept(qualNameVisitor, null);
    }

    private ElementVisitor<String,Void> qualNameVisitor = new SimpleElementVisitor6<String,Void>() {
	protected String defaultAction(Element e, Void ignore) {
	    return "";
	}

	public String visitPackage(PackageElement e, Void ignore) {
	    return e.getQualifiedName().toString();
	}

	public String visitType(TypeElement e, Void ignore) {
	    return e.getQualifiedName().toString();
	}
    };
}