import com.sun.tools.javac.main.OptionName; //导入依赖的package包/类
public static void main(String[] args) throws IOException {
	if (args.length == 0) {
		System.out.println("Usage: Supply a file name to print.");
		return;
	}
	Context context = new Context();
	
	Options.instance(context).put(OptionName.ENCODING, "UTF-8");
	
	JavaCompiler compiler = new JavaCompiler(context);
	compiler.genEndPos = true;
	compiler.keepComments = true;
	
	@SuppressWarnings("deprecation") JCCompilationUnit cu = compiler.parse(args[0]);
	JcTreePrinter printer = new JcTreePrinter(true);
	printer.visit(cu);
	System.out.println(printer);
}
 

import com.sun.tools.javac.main.OptionName; //导入依赖的package包/类
protected JCTree parseWithLombok(Source source) {
	Context context = new Context();
	
	Options.instance(context).put(OptionName.ENCODING, "UTF-8");
	
	JavaCompiler compiler = new JavaCompiler(context);
	compiler.genEndPos = true;
	compiler.keepComments = true;
	
	JCCompilationUnit cu = compiler.parse(new ContentBasedJavaFileObject(source.getName(), source.getRawInput()));
	JcTreeConverter converter = new JcTreeConverter();
	JcTreeBuilder builder = new JcTreeBuilder();
	converter.visit(cu);
	builder.visit(converter.getResult());
	return builder.get();
}
 

import com.sun.tools.javac.main.OptionName; //导入依赖的package包/类
private File getOutputLocation(File dir, OptionName defaultOptionName) {
    if (dir != null)
        return dir;
    String arg = options.get(defaultOptionName);
    if (arg == null)
        return null;
    return new File(arg);
}
 

import com.sun.tools.javac.main.OptionName; //导入依赖的package包/类
protected Source getSource() {
    String sourceName = options.get(OptionName.SOURCE);
    Source source = null;
    if (sourceName != null)
        source = Source.lookup(sourceName);
    return (source != null ? source : Source.DEFAULT);
}
 

import com.sun.tools.javac.main.OptionName; //导入依赖的package包/类
public String getEncodingName() {
    String encName = options.get(OptionName.ENCODING);
    if (encName == null)
        return getDefaultEncodingName();
    else
        return encName;
}
 

import com.sun.tools.javac.main.OptionName; //导入依赖的package包/类
private int getIntOption(Options options, OptionName optionName, int defaultValue) {
    String s = options.get(optionName);
    try {
        if (s != null) {
            int n = Integer.parseInt(s);
            return (n <= 0 ? Integer.MAX_VALUE : n);
        }
    } catch (NumberFormatException e) {
        // silently ignore ill-formed numbers
    }
    return defaultValue;
}
 

import com.sun.tools.javac.main.OptionName; //导入依赖的package包/类
protected String getEncodingName() {
    String encName = options.get(OptionName.ENCODING);
    if (encName == null)
        return getDefaultEncodingName();
    else
        return encName;
}
 

import com.sun.tools.javac.main.OptionName; //导入依赖的package包/类
protected JCTree parseWithTargetCompiler(Source source) {
	Context context = new Context();
	
	Options.instance(context).put(OptionName.ENCODING, "UTF-8");
	
	JavaCompiler compiler = new JavaCompiler(context);
	compiler.genEndPos = true;
	compiler.keepComments = true;
	
	JCCompilationUnit cu = compiler.parse(new ContentBasedJavaFileObject(source.getName(), source.getRawInput()));
	return cu;
}
 

import com.sun.tools.javac.main.OptionName; //导入依赖的package包/类
protected Node parseWithTargetCompiler(Source source) {
	Context context = new Context();
	
	Options.instance(context).put(OptionName.ENCODING, "UTF-8");
	
	CommentCatcher catcher = CommentCatcher.create(context);
	JavaCompiler compiler = catcher.getCompiler();
	
	JCCompilationUnit cu = compiler.parse(new ContentBasedJavaFileObject(source.getName(), source.getRawInput()));
	JcTreeConverter converter = new JcTreeConverter();
	converter.visit(cu);
	return converter.getResultWithJavadoc(catcher.getComments(cu));
}
 

import com.sun.tools.javac.main.OptionName; //导入依赖的package包/类
/**
 * Get the value for an option.
 */
public String get(OptionName name) {
    return values.get(name.optionName);
}
 

import com.sun.tools.javac.main.OptionName; //导入依赖的package包/类
/**
 * Check if the value for an option has been set.
 */
public boolean isSet(OptionName name) {
    return (values.get(name.optionName) != null);
}