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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.buildutil;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.FileSet;
/**
* Ant task to convert a given set of files from Text to HTML.
* Inserts an HTML header including pre tags and replaces special characters
* with their HTML escaped equivalents.
*
* <p>This task is currently used by the ant script to build our examples</p>
*
* @author Mark Roth
*/
public class Txt2Html
extends Task
{
/** The directory to contain the resulting files */
private File todir;
/** The file to be converted into HTML */
private final List<FileSet> filesets = new ArrayList<>();
/**
* The encoding of the source files (.java and .jsp). Once they use
* UTF-8, this will need to be updated.
*/
private static final String SOURCE_ENCODING = "ISO-8859-1";
/**
* Line terminator to be used for separating lines of the generated
* HTML page, to be independent from "line.separator" system property.
*/
private static final String LINE_SEPARATOR = "\r\n";
/**
* Sets the directory to contain the resulting files
*
* @param todir The directory
*/
public void setTodir( File todir ) {
this.todir = todir;
}
/**
* Sets the files to be converted into HTML
*
* @param fs The fileset to be converted.
*/
public void addFileset( FileSet fs ) {
filesets.add( fs );
}
/**
* Perform the conversion
*
* @throws BuildException if an error occurs during execution of
* this task.
*/
@Override
public void execute()
throws BuildException
{
int count = 0;
// Step through each file and convert.
for (FileSet fs : filesets) {
DirectoryScanner ds = fs.getDirectoryScanner(getProject());
File basedir = ds.getBasedir();
String[] files = ds.getIncludedFiles();
for (String file : files) {
File from = new File(basedir, file);
File to = new File(todir, file + ".html");
if (!to.exists() ||
(from.lastModified() > to.lastModified())) {
log("Converting file '" + from.getAbsolutePath() +
"' to '" + to.getAbsolutePath(), Project.MSG_VERBOSE);
try {
convert(from, to);
} catch (IOException e) {
throw new BuildException("Could not convert '" +
from.getAbsolutePath() + "' to '" +
to.getAbsolutePath() + "'", e);
}
count++;
}
}
if( count > 0 ) {
log( "Converted " + count + " file" + (count > 1 ? "s" : "") +
" to " + todir.getAbsolutePath() );
}
}
}
/**
* Perform the actual copy and conversion
*
* @param from The input file
* @param to The output file
* @throws IOException Thrown if an error occurs during the conversion
*/
private void convert( File from, File to )
throws IOException
{
// Open files:
try (BufferedReader in = new BufferedReader(new InputStreamReader(
new FileInputStream(from), SOURCE_ENCODING))) {
try (PrintWriter out = new PrintWriter(new OutputStreamWriter(
new FileOutputStream(to), "UTF-8"))) {
// Output header:
out.print("<!DOCTYPE html><html><head><meta charset=\"UTF-8\" />"
+ "<title>Source Code</title></head><body><pre>" );
// Convert, line-by-line:
String line;
while( (line = in.readLine()) != null ) {
StringBuilder result = new StringBuilder();
int len = line.length();
for( int i = 0; i < len; i++ ) {
char c = line.charAt( i );
switch( c ) {
case '&':
result.append( "&" );
break;
case '<':
result.append( "<" );
break;
default:
result.append( c );
}
}
out.print( result.toString() + LINE_SEPARATOR );
}
// Output footer:
out.print( "</pre></body></html>" );
}
}
}
}
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