test/langtools/tools/javac/doctree/dcapi/DocCommentTreeApiTester.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2015, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 /*
  * @test
  * @bug  8132096 8157611 8190552
  * @summary test the APIs  in the DocTree interface
  * @modules jdk.compiler/com.sun.tools.javac.api
  *          jdk.compiler/com.sun.tools.javac.file
  *          jdk.compiler/com.sun.tools.javac.tree
  *          jdk.compiler/com.sun.tools.javac.util
  * @compile ../DocCommentTester.java DocCommentTreeApiTester.java
  * @run main DocCommentTreeApiTester
  */

 import java.io.BufferedReader;
 import java.io.File;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.io.Reader;
 import java.io.StringWriter;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.text.BreakIterator;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Locale;

 import javax.lang.model.element.Element;
 import javax.lang.model.element.PackageElement;
 import javax.lang.model.util.Elements;
 import javax.tools.FileObject;
 import javax.tools.JavaFileObject;
 import javax.tools.JavaFileObject.Kind;
 import javax.tools.StandardJavaFileManager;

 import com.sun.source.doctree.DocTree;
 import com.sun.source.doctree.DocCommentTree;
 import com.sun.source.util.DocTreePath;
 import com.sun.source.util.DocTrees;
 import com.sun.source.util.JavacTask;
 import com.sun.tools.javac.api.JavacTool;
 import com.sun.tools.javac.tree.DocPretty;

 public class DocCommentTreeApiTester {

     private static final String MARKER_START = "EXPECT_START";
     private static final String MARKER_END   = "EXPECT_END";

     private static final String testSrc = System.getProperty("test.src", ".");

     private static final JavacTool javac = JavacTool.create();

     private static final DocCommentTester.ASTChecker.Printer printer =
             new DocCommentTester.ASTChecker.Printer();
     int pass;
     int fail;

     public DocCommentTreeApiTester() {
         pass = 0;
         fail = 0;
     }

     public static void main(String... args) throws Exception {
         DocCommentTreeApiTester test = new DocCommentTreeApiTester();
         try {
             // test getting a DocTree from an element
             test.runElementAndBreakIteratorTests("Anchor.java", "Anchor test.");

             // test relative paths in a class within a package
             test.runRelativePathTest("pkg/Anchor.java", "package.html", true);

             // tests files relative path in an unnamed package
             test.runRelativePathTest("Anchor.java", "overview0.html", true);

             // test doctree path and Doc
             test.runDocTreePath("Anchor.java", "package.html");

             // test for correct parsing using valid and some invalid html tags
             test.runFileObjectTest("overview0.html");
             test.runFileObjectTest("overview1.html");
             test.runFileObjectTest("overview2.html");
             test.runFileObjectTest("overview3.html");
             test.runFileObjectTest("overview4.html");
             test.runFileObjectTest("overview5.html");
             test.runFileObjectTest("overview6.html");
             test.runFileObjectTest("overview7.html");

         } finally {
             test.status();
         }
     }
     void status() throws Exception {
         System.err.println("pass:" + pass + "  fail: " + fail);
         if (fail > 0) {
             throw new Exception("Fails");
         }
     }

     /**
      * Tests getting a DocCommentTree from an element, as well
      * as test if break iterator setter/getter works correctly.
      *
      * @param javaFileName a test file to be processed
      * @param expected the expected output
      * @throws java.io.IOException
      */
     public void runElementAndBreakIteratorTests(String javaFileName, String expected) throws IOException {
         List<File> javaFiles = new ArrayList<>();
         javaFiles.add(new File(testSrc, javaFileName));

         List<File> dirs = new ArrayList<>();
         dirs.add(new File(testSrc));

         try (StandardJavaFileManager fm = javac.getStandardFileManager(null, null, null)) {
             fm.setLocation(javax.tools.StandardLocation.SOURCE_PATH, dirs);
             Iterable<? extends JavaFileObject> fos = fm.getJavaFileObjectsFromFiles(javaFiles);

             final JavacTask t = javac.getTask(null, fm, null, null, null, fos);
             final DocTrees trees = DocTrees.instance(t);

             Iterable<? extends Element> elements = t.analyze();

             Element klass = elements.iterator().next();
             DocCommentTree dcTree = trees.getDocCommentTree(klass);

             List<? extends DocTree> firstSentence = dcTree.getFirstSentence();
             StringWriter sw = new StringWriter();
             DocPretty pretty = new DocPretty(sw);
             pretty.print(firstSentence);
             check("getDocCommentTree(Element)", expected, sw.toString());

             BreakIterator bi = BreakIterator.getSentenceInstance(Locale.FRENCH);
             trees.setBreakIterator(bi);
             BreakIterator nbi = trees.getBreakIterator();
             if (bi.equals(nbi)) {
                 pass++;
                 check("getDocCommentTree(Element) with BreakIterator", expected, sw.toString());
             } else {
                 fail++;
                 System.err.println("BreakIterators don't match");
             }
         }
     }

     /**
      * Tests DocTrees.getDocCommentTree(Element e, String relpath) using relative path.
      *
      * @param javaFileName the reference java file
      * @param fileName the relative html file
      * @throws java.lang.Exception ouch
      */
     public void runRelativePathTest(String javaFileName, String fileName,
                                     boolean bodyOnly) throws Exception  {
         List<File> javaFiles = new ArrayList<>();
         javaFiles.add(new File(testSrc, javaFileName));

         List<File> dirs = new ArrayList<>();
         dirs.add(new File(testSrc));

         try (StandardJavaFileManager fm = javac.getStandardFileManager(null, null, null)) {
             fm.setLocation(javax.tools.StandardLocation.SOURCE_PATH, dirs);
             Iterable<? extends JavaFileObject> fos = fm.getJavaFileObjectsFromFiles(javaFiles);

             final JavacTask t = javac.getTask(null, fm, null, null, null, fos);
             final DocTrees trees = DocTrees.instance(t);

             Iterable<? extends Element> elements = t.analyze();

             Element klass = elements.iterator().next();

             DocCommentTree dcTree = trees.getDocCommentTree(klass, fileName);

             if (dcTree == null)
                 throw new Error("invalid input: " + fileName);

             StringWriter sw = new StringWriter();
             printer.print(dcTree, sw);
             String found = sw.toString();

             FileObject htmlFo = fm.getFileForInput(javax.tools.StandardLocation.SOURCE_PATH,
                     t.getElements().getPackageOf(klass).getQualifiedName().toString(),
                     fileName + ".out");

             String expected = getExpected(htmlFo.openReader(true));
             astcheck(fileName, expected, found);
         }
     }

     /**
      * Tests DocTrees.getDocCommentTree(FileObject fo).
      *
      * @param htmlfileName the file to be parsed
      * @throws Exception when an error occurs.
      */
     public void runFileObjectTest(String htmlfileName) throws Exception {
         List<File> javaFiles =  Collections.emptyList();

         List<File> otherFiles = new ArrayList<>();
         otherFiles.add(new File(testSrc, htmlfileName));
         otherFiles.add(new File(testSrc, htmlfileName + ".out"));

         try (StandardJavaFileManager fm = javac.getStandardFileManager(null, null, null)) {
             Iterable<? extends JavaFileObject> fos = fm.getJavaFileObjectsFromFiles(javaFiles);
             Iterable<? extends JavaFileObject> others = fm.getJavaFileObjectsFromFiles(otherFiles);

             final JavacTask t = javac.getTask(null, fm, null, null, null, fos);
             final DocTrees trees = DocTrees.instance(t);

             StringWriter sw = new StringWriter();
             DocCommentTree dct = null;
             String expected = null;
             for (JavaFileObject jfo : others) {
                 switch (jfo.getKind()) {
                     case HTML:
                         dct = trees.getDocCommentTree(jfo);
                         if (dct == null)
                             throw new Exception("invalid input: " + jfo);
                         break;
                     default:
                         expected = getExpected(jfo.openReader(true));
                 }
             }

             printer.print(dct, sw);
             String found = sw.toString();
             astcheck(otherFiles.toString(), expected, found);
         }
     }

     /**
      * Tests DocTrees.getDocTreePath(PackageElement p, FileObject fo).
      *
      * @param javaFileName the java anchor file
      * @param pkgFileName the package file name
      * @throws Exception e if something goes awry
      */
     public void runDocTreePath(String javaFileName, String pkgFileName) throws Exception  {
         List<File> javaFiles = new ArrayList<>();
         javaFiles.add(new File(testSrc, javaFileName));

         List<File> otherFiles = new ArrayList<>();
         otherFiles.add(new File(testSrc, pkgFileName + ".out"));

         List<File> dirs = new ArrayList<>();
         dirs.add(new File(testSrc));

         try (StandardJavaFileManager fm = javac.getStandardFileManager(null, null, null)) {
             fm.setLocation(javax.tools.StandardLocation.SOURCE_PATH, dirs);
             Iterable<? extends JavaFileObject> fos = fm.getJavaFileObjectsFromFiles(javaFiles);

             final JavacTask t = javac.getTask(null, fm, null, null, null, fos);
             final DocTrees trees = DocTrees.instance(t);
             final Elements elementUtils = t.getElements();

             Iterable<? extends Element> elements = t.analyze();

             Element klass = elements.iterator().next();
             PackageElement pkg = elementUtils.getPackageOf(klass);

             FileObject htmlFo = fm.getFileForInput(javax.tools.StandardLocation.SOURCE_PATH,
                     t.getElements().getPackageOf(klass).getQualifiedName().toString(),
                     "package.html");
             DocTreePath treePath = trees.getDocTreePath(htmlFo, pkg);

             if (treePath == null) {
                 throw new Exception("invalid input: " + htmlFo);
             }

             DocCommentTree dcTree = treePath.getDocComment();
             if (dcTree == null)
                 throw new Exception("invalid input" + htmlFo);

             StringWriter sw = new StringWriter();
             printer.print(dcTree, sw);
             String found = sw.toString();
             Iterable<? extends JavaFileObject> oos = fm.getJavaFileObjectsFromFiles(otherFiles);
             JavaFileObject otherFo = oos.iterator().next();
             String expected = getExpected(otherFo.openReader(true));

             astcheck(pkgFileName, expected, found);
         }
     }

     void astcheck(String testinfo, String expected, String found) {
         System.err.print("ASTChecker: " + testinfo);
         check0(expected, found);
     }
     void check(String testinfo, String expected, String found) {
         System.err.print(testinfo);
         check0(expected, found);
     }
     void check0(String expected, String found) {
         if (expected.equals(found)) {
             pass++;
             System.err.println(" PASS");
         } else {
             fail++;
             System.err.println(" FAILED");
             System.err.println("Expect:\n" + expected);
             System.err.println("Found:\n" + found);
         }
     }

     String getExpected(Reader inrdr) throws IOException {
         BufferedReader rdr = new BufferedReader(inrdr);
         List<String> lines = new ArrayList<>();
         String line = rdr.readLine();
         while (line != null) {
             lines.add(line);
             line = rdr.readLine();
         }
         return getExpected(lines);
     }

     String getExpected(List<String> lines) {
         boolean start = false;
         StringWriter sw = new StringWriter();
         PrintWriter out = new PrintWriter(sw);
         for (String line : lines) {
             if (!start) {
                 start = line.startsWith(MARKER_START);
                 continue;
             }
             if (line.startsWith(MARKER_END)) {
                 out.flush();
                 return sw.toString();
             }
             out.println(line);
         }
         return out.toString() + "Warning: html comment end not found";
     }
 }
	/*
	* Copyright (c) 2015, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* @test
	* @bug 8132096 8157611 8190552
	* @summary test the APIs in the DocTree interface
	* @modules jdk.compiler/com.sun.tools.javac.api
	* jdk.compiler/com.sun.tools.javac.file
	* jdk.compiler/com.sun.tools.javac.tree
	* jdk.compiler/com.sun.tools.javac.util
	* @compile ../DocCommentTester.java DocCommentTreeApiTester.java
	* @run main DocCommentTreeApiTester
	*/

	import java.io.BufferedReader;
	import java.io.File;
	import java.io.IOException;
	import java.io.PrintWriter;
	import java.io.Reader;
	import java.io.StringWriter;
	import java.nio.file.Files;
	import java.nio.file.Path;
	import java.text.BreakIterator;
	import java.util.ArrayList;
	import java.util.Collections;
	import java.util.List;
	import java.util.Locale;

	import javax.lang.model.element.Element;
	import javax.lang.model.element.PackageElement;
	import javax.lang.model.util.Elements;
	import javax.tools.FileObject;
	import javax.tools.JavaFileObject;
	import javax.tools.JavaFileObject.Kind;
	import javax.tools.StandardJavaFileManager;

	import com.sun.source.doctree.DocTree;
	import com.sun.source.doctree.DocCommentTree;
	import com.sun.source.util.DocTreePath;
	import com.sun.source.util.DocTrees;
	import com.sun.source.util.JavacTask;
	import com.sun.tools.javac.api.JavacTool;
	import com.sun.tools.javac.tree.DocPretty;

	public class DocCommentTreeApiTester {

	private static final String MARKER_START = "EXPECT_START";
	private static final String MARKER_END = "EXPECT_END";

	private static final String testSrc = System.getProperty("test.src", ".");

	private static final JavacTool javac = JavacTool.create();

	private static final DocCommentTester.ASTChecker.Printer printer =
	new DocCommentTester.ASTChecker.Printer();
	int pass;
	int fail;

	public DocCommentTreeApiTester() {
	pass = 0;
	fail = 0;
	}

	public static void main(String... args) throws Exception {
	DocCommentTreeApiTester test = new DocCommentTreeApiTester();
	try {
	// test getting a DocTree from an element
	test.runElementAndBreakIteratorTests("Anchor.java", "Anchor test.");

	// test relative paths in a class within a package
	test.runRelativePathTest("pkg/Anchor.java", "package.html", true);

	// tests files relative path in an unnamed package
	test.runRelativePathTest("Anchor.java", "overview0.html", true);

	// test doctree path and Doc
	test.runDocTreePath("Anchor.java", "package.html");

	// test for correct parsing using valid and some invalid html tags
	test.runFileObjectTest("overview0.html");
	test.runFileObjectTest("overview1.html");
	test.runFileObjectTest("overview2.html");
	test.runFileObjectTest("overview3.html");
	test.runFileObjectTest("overview4.html");
	test.runFileObjectTest("overview5.html");
	test.runFileObjectTest("overview6.html");
	test.runFileObjectTest("overview7.html");

	} finally {
	test.status();
	}
	}
	void status() throws Exception {
	System.err.println("pass:" + pass + " fail: " + fail);
	if (fail > 0) {
	throw new Exception("Fails");
	}
	}

	/**
	* Tests getting a DocCommentTree from an element, as well
	* as test if break iterator setter/getter works correctly.
	*
	* @param javaFileName a test file to be processed
	* @param expected the expected output
	* @throws java.io.IOException
	*/
	public void runElementAndBreakIteratorTests(String javaFileName, String expected) throws IOException {
	List<File> javaFiles = new ArrayList<>();
	javaFiles.add(new File(testSrc, javaFileName));

	List<File> dirs = new ArrayList<>();
	dirs.add(new File(testSrc));

	try (StandardJavaFileManager fm = javac.getStandardFileManager(null, null, null)) {
	fm.setLocation(javax.tools.StandardLocation.SOURCE_PATH, dirs);
	Iterable<? extends JavaFileObject> fos = fm.getJavaFileObjectsFromFiles(javaFiles);

	final JavacTask t = javac.getTask(null, fm, null, null, null, fos);
	final DocTrees trees = DocTrees.instance(t);

	Iterable<? extends Element> elements = t.analyze();

	Element klass = elements.iterator().next();
	DocCommentTree dcTree = trees.getDocCommentTree(klass);

	List<? extends DocTree> firstSentence = dcTree.getFirstSentence();
	StringWriter sw = new StringWriter();
	DocPretty pretty = new DocPretty(sw);
	pretty.print(firstSentence);
	check("getDocCommentTree(Element)", expected, sw.toString());

	BreakIterator bi = BreakIterator.getSentenceInstance(Locale.FRENCH);
	trees.setBreakIterator(bi);
	BreakIterator nbi = trees.getBreakIterator();
	if (bi.equals(nbi)) {
	pass++;
	check("getDocCommentTree(Element) with BreakIterator", expected, sw.toString());
	} else {
	fail++;
	System.err.println("BreakIterators don't match");
	}
	}
	}

	/**
	* Tests DocTrees.getDocCommentTree(Element e, String relpath) using relative path.
	*
	* @param javaFileName the reference java file
	* @param fileName the relative html file
	* @throws java.lang.Exception ouch
	*/
	public void runRelativePathTest(String javaFileName, String fileName,
	boolean bodyOnly) throws Exception {
	List<File> javaFiles = new ArrayList<>();
	javaFiles.add(new File(testSrc, javaFileName));

	List<File> dirs = new ArrayList<>();
	dirs.add(new File(testSrc));

	try (StandardJavaFileManager fm = javac.getStandardFileManager(null, null, null)) {
	fm.setLocation(javax.tools.StandardLocation.SOURCE_PATH, dirs);
	Iterable<? extends JavaFileObject> fos = fm.getJavaFileObjectsFromFiles(javaFiles);

	final JavacTask t = javac.getTask(null, fm, null, null, null, fos);
	final DocTrees trees = DocTrees.instance(t);

	Iterable<? extends Element> elements = t.analyze();

	Element klass = elements.iterator().next();

	DocCommentTree dcTree = trees.getDocCommentTree(klass, fileName);

	if (dcTree == null)
	throw new Error("invalid input: " + fileName);

	StringWriter sw = new StringWriter();
	printer.print(dcTree, sw);
	String found = sw.toString();

	FileObject htmlFo = fm.getFileForInput(javax.tools.StandardLocation.SOURCE_PATH,
	t.getElements().getPackageOf(klass).getQualifiedName().toString(),
	fileName + ".out");

	String expected = getExpected(htmlFo.openReader(true));
	astcheck(fileName, expected, found);
	}
	}

	/**
	* Tests DocTrees.getDocCommentTree(FileObject fo).
	*
	* @param htmlfileName the file to be parsed
	* @throws Exception when an error occurs.
	*/
	public void runFileObjectTest(String htmlfileName) throws Exception {
	List<File> javaFiles = Collections.emptyList();

	List<File> otherFiles = new ArrayList<>();
	otherFiles.add(new File(testSrc, htmlfileName));
	otherFiles.add(new File(testSrc, htmlfileName + ".out"));

	try (StandardJavaFileManager fm = javac.getStandardFileManager(null, null, null)) {
	Iterable<? extends JavaFileObject> fos = fm.getJavaFileObjectsFromFiles(javaFiles);
	Iterable<? extends JavaFileObject> others = fm.getJavaFileObjectsFromFiles(otherFiles);

	final JavacTask t = javac.getTask(null, fm, null, null, null, fos);
	final DocTrees trees = DocTrees.instance(t);

	StringWriter sw = new StringWriter();
	DocCommentTree dct = null;
	String expected = null;
	for (JavaFileObject jfo : others) {
	switch (jfo.getKind()) {
	case HTML:
	dct = trees.getDocCommentTree(jfo);
	if (dct == null)
	throw new Exception("invalid input: " + jfo);
	break;
	default:
	expected = getExpected(jfo.openReader(true));
	}
	}

	printer.print(dct, sw);
	String found = sw.toString();
	astcheck(otherFiles.toString(), expected, found);
	}
	}

	/**
	* Tests DocTrees.getDocTreePath(PackageElement p, FileObject fo).
	*
	* @param javaFileName the java anchor file
	* @param pkgFileName the package file name
	* @throws Exception e if something goes awry
	*/
	public void runDocTreePath(String javaFileName, String pkgFileName) throws Exception {
	List<File> javaFiles = new ArrayList<>();
	javaFiles.add(new File(testSrc, javaFileName));

	List<File> otherFiles = new ArrayList<>();
	otherFiles.add(new File(testSrc, pkgFileName + ".out"));

	List<File> dirs = new ArrayList<>();
	dirs.add(new File(testSrc));

	try (StandardJavaFileManager fm = javac.getStandardFileManager(null, null, null)) {
	fm.setLocation(javax.tools.StandardLocation.SOURCE_PATH, dirs);
	Iterable<? extends JavaFileObject> fos = fm.getJavaFileObjectsFromFiles(javaFiles);

	final JavacTask t = javac.getTask(null, fm, null, null, null, fos);
	final DocTrees trees = DocTrees.instance(t);
	final Elements elementUtils = t.getElements();

	Iterable<? extends Element> elements = t.analyze();

	Element klass = elements.iterator().next();
	PackageElement pkg = elementUtils.getPackageOf(klass);

	FileObject htmlFo = fm.getFileForInput(javax.tools.StandardLocation.SOURCE_PATH,
	t.getElements().getPackageOf(klass).getQualifiedName().toString(),
	"package.html");
	DocTreePath treePath = trees.getDocTreePath(htmlFo, pkg);

	if (treePath == null) {
	throw new Exception("invalid input: " + htmlFo);
	}

	DocCommentTree dcTree = treePath.getDocComment();
	if (dcTree == null)
	throw new Exception("invalid input" + htmlFo);

	StringWriter sw = new StringWriter();
	printer.print(dcTree, sw);
	String found = sw.toString();
	Iterable<? extends JavaFileObject> oos = fm.getJavaFileObjectsFromFiles(otherFiles);
	JavaFileObject otherFo = oos.iterator().next();
	String expected = getExpected(otherFo.openReader(true));

	astcheck(pkgFileName, expected, found);
	}
	}

	void astcheck(String testinfo, String expected, String found) {
	System.err.print("ASTChecker: " + testinfo);
	check0(expected, found);
	}
	void check(String testinfo, String expected, String found) {
	System.err.print(testinfo);
	check0(expected, found);
	}
	void check0(String expected, String found) {
	if (expected.equals(found)) {
	pass++;
	System.err.println(" PASS");
	} else {
	fail++;
	System.err.println(" FAILED");
	System.err.println("Expect:\n" + expected);
	System.err.println("Found:\n" + found);
	}
	}

	String getExpected(Reader inrdr) throws IOException {
	BufferedReader rdr = new BufferedReader(inrdr);
	List<String> lines = new ArrayList<>();
	String line = rdr.readLine();
	while (line != null) {
	lines.add(line);
	line = rdr.readLine();
	}
	return getExpected(lines);
	}

	String getExpected(List<String> lines) {
	boolean start = false;
	StringWriter sw = new StringWriter();
	PrintWriter out = new PrintWriter(sw);
	for (String line : lines) {
	if (!start) {
	start = line.startsWith(MARKER_START);
	continue;
	}
	if (line.startsWith(MARKER_END)) {
	out.flush();
	return sw.toString();
	}
	out.println(line);
	}
	return out.toString() + "Warning: html comment end not found";
	}
	}