Ant example source code file (FixCRLF.java)
The FixCRLF.java source code
/*
* 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.tools.ant.taskdefs;
import java.io.File;
import java.io.Reader;
import java.io.FileReader;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.Vector;
import java.util.Enumeration;
import java.util.NoSuchElementException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.filters.FixCrLfFilter;
import org.apache.tools.ant.filters.ChainableReader;
import org.apache.tools.ant.types.FilterChain;
import org.apache.tools.ant.types.EnumeratedAttribute;
import org.apache.tools.ant.util.FileUtils;
/**
* Converts text source files to local OS formatting conventions, as
* well as repair text files damaged by misconfigured or misguided editors or
* file transfer programs.
* <p>
* This task can take the following arguments:
* <ul>
* <li>srcdir
* <li>destdir
* <li>include
* <li>exclude
* <li>cr
* <li>eol
* <li>tab
* <li>eof
* <li>encoding
* <li>targetencoding
* </ul>
* Of these arguments, only <b>sourcedir is required.
* <p>
* When this task executes, it will scan the srcdir based on the include
* and exclude properties.
* <p>
* This version generalises the handling of EOL characters, and allows
* for CR-only line endings (the standard on Mac systems prior to OS X).
* Tab handling has also been generalised to accommodate any tabwidth
* from 2 to 80, inclusive. Importantly, it will leave untouched any
* literal TAB characters embedded within string or character constants.
* <p>
* <em>Warning: do not run on binary files.
* <em>Caution: run with care on carefully formatted files.
* This may sound obvious, but if you don't specify asis, presume that
* your files are going to be modified. If "tabs" is "add" or "remove",
* whitespace characters may be added or removed as necessary. Similarly,
* for CR's - in fact "eol"="crlf" or cr="add" can result in cr
* characters being removed in one special case accommodated, i.e.,
* CRCRLF is regarded as a single EOL to handle cases where other
* programs have converted CRLF into CRCRLF.
*
* @since Ant 1.1
*
* @ant.task category="filesystem"
*/
public class FixCRLF extends MatchingTask implements ChainableReader {
/** error string for using srcdir and file */
public static final String ERROR_FILE_AND_SRCDIR
= "srcdir and file are mutually exclusive";
private static final FileUtils FILE_UTILS = FileUtils.getFileUtils();
private boolean preserveLastModified = false;
private File srcDir;
private File destDir = null;
private File file;
private FixCrLfFilter filter = new FixCrLfFilter();
private Vector fcv = null;
/**
* Encoding to assume for the files
*/
private String encoding = null;
/**
* Encoding to use for output files
*/
private String outputEncoding = null;
/**
* Chain this task as a reader.
* @param rdr Reader to chain.
* @return a Reader.
* @since Ant 1.7?
*/
public final Reader chain(final Reader rdr) {
return filter.chain(rdr);
}
/**
* Set the source dir to find the source text files.
* @param srcDir the source directory.
*/
public void setSrcdir(File srcDir) {
this.srcDir = srcDir;
}
/**
* Set the destination where the fixed files should be placed.
* Default is to replace the original file.
* @param destDir the destination directory.
*/
public void setDestdir(File destDir) {
this.destDir = destDir;
}
/**
* Set to true if modifying Java source files.
* @param javafiles whether modifying Java files.
*/
public void setJavafiles(boolean javafiles) {
filter.setJavafiles(javafiles);
}
/**
* Set a single file to convert.
* @since Ant 1.6.3
* @param file the file to convert.
*/
public void setFile(File file) {
this.file = file;
}
/**
* Specify how EndOfLine characters are to be handled.
*
* @param attr valid values:
* <ul>
* <li>asis: leave line endings alone
* <li>cr: convert line endings to CR
* <li>lf: convert line endings to LF
* <li>crlf: convert line endings to CRLF
* </ul>
*/
public void setEol(CrLf attr) {
filter.setEol(FixCrLfFilter.CrLf.newInstance(attr.getValue()));
}
/**
* Specify how carriage return (CR) characters are to be handled.
*
* @param attr valid values:
* <ul>
* <li>add: ensure that there is a CR before every LF
* <li>asis: leave CR characters alone
* <li>remove: remove all CR characters
* </ul>
*
* @deprecated since 1.4.x.
* Use {@link #setEol setEol} instead.
*/
public void setCr(AddAsisRemove attr) {
log("DEPRECATED: The cr attribute has been deprecated,",
Project.MSG_WARN);
log("Please use the eol attribute instead", Project.MSG_WARN);
String option = attr.getValue();
CrLf c = new CrLf();
if (option.equals("remove")) {
c.setValue("lf");
} else if (option.equals("asis")) {
c.setValue("asis");
} else {
// must be "add"
c.setValue("crlf");
}
setEol(c);
}
/**
* Specify how tab characters are to be handled.
*
* @param attr valid values:
* <ul>
* <li>add: convert sequences of spaces which span a tab stop to tabs
* <li>asis: leave tab and space characters alone
* <li>remove: convert tabs to spaces
* </ul>
*/
public void setTab(AddAsisRemove attr) {
filter.setTab(FixCrLfFilter.AddAsisRemove.newInstance(attr.getValue()));
}
/**
* Specify tab length in characters.
*
* @param tlength specify the length of tab in spaces.
* @throws BuildException on error.
*/
public void setTablength(int tlength) throws BuildException {
try {
filter.setTablength(tlength);
} catch (IOException e) {
throw new BuildException(e);
}
}
/**
* Specify how DOS EOF (control-z) characters are to be handled.
*
* @param attr valid values:
* <ul>
* <li>add: ensure that there is an eof at the end of the file
* <li>asis: leave eof characters alone
* <li>remove: remove any eof character found at the end
* </ul>
*/
public void setEof(AddAsisRemove attr) {
filter.setEof(FixCrLfFilter.AddAsisRemove.newInstance(attr.getValue()));
}
/**
* Specifies the encoding Ant expects the files to be
* in--defaults to the platforms default encoding.
* @param encoding String encoding name.
*/
public void setEncoding(String encoding) {
this.encoding = encoding;
}
/**
* Specifies the encoding that the files are
* to be written in--same as input encoding by default.
* @param outputEncoding String outputEncoding name.
*/
public void setOutputEncoding(String outputEncoding) {
this.outputEncoding = outputEncoding;
}
/**
* Specify whether a missing EOL will be added
* to the final line of a file.
* @param fixlast whether to fix the last line.
*/
public void setFixlast(boolean fixlast) {
filter.setFixlast(fixlast);
}
/**
* Set whether to preserve the last modified time as the original files.
* @param preserve true if timestamps should be preserved.
* @since Ant 1.6.3
*/
public void setPreserveLastModified(boolean preserve) {
preserveLastModified = preserve;
}
/**
* Executes the task.
* @throws BuildException on error.
*/
public void execute() throws BuildException {
// first off, make sure that we've got a srcdir and destdir
validate();
// log options used
String enc = encoding == null ? "default" : encoding;
log("options:"
+ " eol=" + filter.getEol().getValue()
+ " tab=" + filter.getTab().getValue()
+ " eof=" + filter.getEof().getValue()
+ " tablength=" + filter.getTablength()
+ " encoding=" + enc
+ " outputencoding="
+ (outputEncoding == null ? enc : outputEncoding),
Project.MSG_VERBOSE);
DirectoryScanner ds = super.getDirectoryScanner(srcDir);
String[] files = ds.getIncludedFiles();
for (int i = 0; i < files.length; i++) {
processFile(files[i]);
}
}
private void validate() throws BuildException {
if (file != null) {
if (srcDir != null) {
throw new BuildException(ERROR_FILE_AND_SRCDIR);
}
//patch file into the fileset
fileset.setFile(file);
//set our parent dir
srcDir = file.getParentFile();
}
if (srcDir == null) {
throw new BuildException("srcdir attribute must be set!");
}
if (!srcDir.exists()) {
throw new BuildException("srcdir does not exist!");
}
if (!srcDir.isDirectory()) {
throw new BuildException("srcdir is not a directory!");
}
if (destDir != null) {
if (!destDir.exists()) {
throw new BuildException("destdir does not exist!");
}
if (!destDir.isDirectory()) {
throw new BuildException("destdir is not a directory!");
}
}
}
private void processFile(String file) throws BuildException {
File srcFile = new File(srcDir, file);
long lastModified = srcFile.lastModified();
File destD = destDir == null ? srcDir : destDir;
if (fcv == null) {
FilterChain fc = new FilterChain();
fc.add(filter);
fcv = new Vector(1);
fcv.add(fc);
}
File tmpFile = FILE_UTILS.createTempFile("fixcrlf", "", null);
tmpFile.deleteOnExit();
try {
FILE_UTILS.copyFile(srcFile, tmpFile, null, fcv, false, false,
encoding, outputEncoding == null ? encoding : outputEncoding,
getProject());
File destFile = new File(destD, file);
boolean destIsWrong = true;
if (destFile.exists()) {
// Compare the destination with the temp file
log("destFile exists", Project.MSG_DEBUG);
destIsWrong = !FILE_UTILS.contentEquals(destFile, tmpFile);
log(destFile + (destIsWrong ? " is being written"
: " is not written, as the contents are identical"),
Project.MSG_DEBUG);
}
if (destIsWrong) {
FILE_UTILS.rename(tmpFile, destFile);
if (preserveLastModified) {
log("preserved lastModified", Project.MSG_DEBUG);
FILE_UTILS.setFileLastModified(destFile, lastModified);
}
tmpFile = null;
}
} catch (IOException e) {
throw new BuildException(e);
}
}
/**
* Deprecated, the functionality has been moved to filters.FixCrLfFilter.
* @deprecated since 1.7.0.
*/
protected class OneLiner implements Enumeration {
private static final int UNDEF = -1;
private static final int NOTJAVA = 0;
private static final int LOOKING = 1;
private static final int INBUFLEN = 8192;
private static final int LINEBUFLEN = 200;
private static final char CTRLZ = '\u001A';
private int state = filter.getJavafiles() ? LOOKING : NOTJAVA;
private StringBuffer eolStr = new StringBuffer(LINEBUFLEN);
private StringBuffer eofStr = new StringBuffer();
private BufferedReader reader;
private StringBuffer line = new StringBuffer();
private boolean reachedEof = false;
private File srcFile;
/**
* Constructor.
* @param srcFile the file to read.
* @throws BuildException if there is an error.
*/
public OneLiner(File srcFile)
throws BuildException {
this.srcFile = srcFile;
try {
reader = new BufferedReader(
((encoding == null) ? new FileReader(srcFile)
: new InputStreamReader(
new FileInputStream(srcFile), encoding)), INBUFLEN);
nextLine();
} catch (IOException e) {
throw new BuildException(srcFile + ": " + e.getMessage(),
e, getLocation());
}
}
/**
* Move to the next line.
* @throws BuildException if there is an error.
*/
protected void nextLine()
throws BuildException {
int ch = -1;
int eolcount = 0;
eolStr = new StringBuffer();
line = new StringBuffer();
try {
ch = reader.read();
while (ch != -1 && ch != '\r' && ch != '\n') {
line.append((char) ch);
ch = reader.read();
}
if (ch == -1 && line.length() == 0) {
// Eof has been reached
reachedEof = true;
return;
}
switch ((char) ch) {
case '\r':
// Check for \r, \r\n and \r\r\n
// Regard \r\r not followed by \n as two lines
++eolcount;
eolStr.append('\r');
reader.mark(2);
ch = reader.read();
switch (ch) {
case '\r':
ch = reader.read();
if ((char) (ch) == '\n') {
eolcount += 2;
eolStr.append("\r\n");
} else {
reader.reset();
}
break;
case '\n':
++eolcount;
eolStr.append('\n');
break;
case -1:
// don't reposition when we've reached the end
// of the stream
break;
default:
reader.reset();
break;
} // end of switch ((char)(ch = reader.read()))
break;
case '\n':
++eolcount;
eolStr.append('\n');
break;
default:
// Fall tru
} // end of switch ((char) ch)
// if at eolcount == 0 and trailing characters of string
// are CTRL-Zs, set eofStr
if (eolcount == 0) {
int i = line.length();
while (--i >= 0 && line.charAt(i) == CTRLZ) {
// keep searching for the first ^Z
}
if (i < line.length() - 1) {
// Trailing characters are ^Zs
// Construct new line and eofStr
eofStr.append(line.toString().substring(i + 1));
if (i < 0) {
line.setLength(0);
reachedEof = true;
} else {
line.setLength(i + 1);
}
}
} // end of if (eolcount == 0)
} catch (IOException e) {
throw new BuildException(srcFile + ": " + e.getMessage(),
e, getLocation());
}
}
/**
* get the eof string.
* @return the eof string.
*/
public String getEofStr() {
return eofStr.substring(0);
}
/**
* get the state.
* @return the state.
*/
public int getState() {
return state;
}
/**
* Set the state.
* @param state the value to use.
*/
public void setState(int state) {
this.state = state;
}
/**
* @return true if there is more elements.
*/
public boolean hasMoreElements() {
return !reachedEof;
}
/**
* get the next element.
* @return the next element.
* @throws NoSuchElementException if there is no more.
*/
public Object nextElement()
throws NoSuchElementException {
if (!hasMoreElements()) {
throw new NoSuchElementException("OneLiner");
}
BufferLine tmpLine =
new BufferLine(line.toString(), eolStr.substring(0));
nextLine();
return tmpLine;
}
/**
* Close the reader.
* @throws IOException if there is an error.
*/
public void close() throws IOException {
if (reader != null) {
reader.close();
}
}
class BufferLine {
private int next = 0;
private int column = 0;
private int lookahead = UNDEF;
private String line;
private String eolStr;
public BufferLine(String line, String eolStr)
throws BuildException {
next = 0;
column = 0;
this.line = line;
this.eolStr = eolStr;
}
public int getNext() {
return next;
}
public void setNext(int next) {
this.next = next;
}
public int getLookahead() {
return lookahead;
}
public void setLookahead(int lookahead) {
this.lookahead = lookahead;
}
public char getChar(int i) {
return line.charAt(i);
}
public char getNextChar() {
return getChar(next);
}
public char getNextCharInc() {
return getChar(next++);
}
public int getColumn() {
return column;
}
public void setColumn(int col) {
column = col;
}
public int incColumn() {
return column++;
}
public int length() {
return line.length();
}
public int getEolLength() {
return eolStr.length();
}
public String getLineString() {
return line;
}
public String getEol() {
return eolStr;
}
public String substring(int begin) {
return line.substring(begin);
}
public String substring(int begin, int end) {
return line.substring(begin, end);
}
public void setState(int state) {
OneLiner.this.setState(state);
}
public int getState() {
return OneLiner.this.getState();
}
}
}
/**
* Enumerated attribute with the values "asis", "add" and "remove".
*/
public static class AddAsisRemove extends EnumeratedAttribute {
/** {@inheritDoc}. */
public String[] getValues() {
return new String[] {"add", "asis", "remove"};
}
}
/**
* Enumerated attribute with the values "asis", "cr", "lf" and "crlf".
*/
public static class CrLf extends EnumeratedAttribute {
/**
* @see EnumeratedAttribute#getValues
*/
/** {@inheritDoc}. */
public String[] getValues() {
return new String[] {"asis", "cr", "lf", "crlf",
"mac", "unix", "dos"};
}
}
}
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