testjavactaskscanner.java

来自「是一款用JAVA 编写的编译器 具有很强的编译功能」· Java 代码 · 共 143 行

/*
 * Copyright 2005-2006 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     4813736
 * @summary Additional functionality test of task and JSR 269
 * @author  Peter von der Ah\u00e9
 * @ignore "misuse" of context breaks with 6358786
 * @run main TestJavacTaskScanner TestJavacTaskScanner.java
 */

import com.sun.tools.javac.api.JavacTaskImpl;
import com.sun.tools.javac.parser.*; // XXX
import com.sun.tools.javac.util.*; // XXX
import java.io.*;
import java.nio.*;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.Elements;
import javax.lang.model.util.Types;
import javax.tools.*;
import javax.tools.JavaFileManager;

public class TestJavacTaskScanner implements Runnable {
    
    final JavacTaskImpl task;
    final Elements elements;
    final Types types;

    TestJavacTaskScanner(JavacTaskImpl task) {
	this.task = task;
	elements = task.getElements();
	types = task.getTypes();
    }
    
    public void run() {
	Iterable<? extends TypeElement> toplevels;
	try {
	    toplevels = task.enter(task.parse());
	} catch (IOException ex) {
	    throw new AssertionError(ex);
	}
	for (TypeElement clazz : toplevels) {
	    System.out.format("Testing %s:%n%n", clazz.getSimpleName());
	    testParseType(clazz);
	    testGetAllMembers(clazz);
	    System.out.println();
	    System.out.println();
	    System.out.println();
	}
    }
    
    void testParseType(TypeElement clazz) {
	DeclaredType type = (DeclaredType)task.parseType("List<String>", clazz);
	for (Element member : elements.getAllMembers((TypeElement)type.asElement())) {
	    TypeMirror mt = types.asMemberOf(type, member);
	    System.out.format("%s : %s -> %s%n", member.getSimpleName(), member.asType(), mt);
	}
    }
    
    public static void main(String... args) throws IOException {
	JavaCompilerTool tool = ToolProvider.defaultJavaCompiler();
	JavaFileManager fm = tool.getStandardFileManager();
	String srcdir = System.getProperty("test.src");
	File file = new File(srcdir, args[0]);
	JavacTaskImpl task = (JavacTaskImpl)tool.run(null, fm.getFileForInput(file.toString()));
	MyScanner.Factory.preRegister(task.getContext());
	TestJavacTaskScanner tester = new TestJavacTaskScanner(task);
	tester.run();
    }
    
    private void testGetAllMembers(TypeElement clazz) {
	for (Element member : elements.getAllMembers(clazz)) {
	    System.out.format("%s : %s", member.getSimpleName(), member.asType());
	}
    }
}

class MyScanner extends Scanner {
    
    public static class Factory extends Scanner.Factory {
	public static void preRegister(final Context context) {
	    context.put(scannerFactoryKey, new Context.Factory<Scanner.Factory>() {
		public Factory make() {
		    return new Factory(context);
		}
	    });
	}
	public Factory(Context context) {
	    super(context);
	}
	
	@Override
	public Scanner newScanner(CharSequence input) {
	    if (input instanceof CharBuffer) {
		return new MyScanner(this, (CharBuffer)input);
	    } else {
		char[] array = input.toString().toCharArray();
		return newScanner(array, array.length);
	    }
	}
	
	@Override
	public Scanner newScanner(char[] input, int inputLength) {
	    return new MyScanner(this, input, inputLength);
	}
    }
    protected MyScanner(Factory fac, CharBuffer buffer) {
	super(fac, buffer);
    }
    protected MyScanner(Factory fac, char[] input, int inputLength) {
	super(fac, input, inputLength);
    }
    
    public void nextToken() {
	super.nextToken();
	System.err.format("Saw token %s (%s)%n", token(), name());
    }
}