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package com.cloudbees.diff.provider;
import com.cloudbees.diff.Diff;
import com.cloudbees.diff.Difference;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.InterruptedIOException;
import java.io.Reader;
import java.util.List;
import java.util.logging.Logger;
import java.util.regex.Pattern;
/**
* The parser of an external diff utility compatible with Unix diff output.
*
* <p>The implementtaion is interruptible by Thread.interrupt().
* On interrupt it kills external program and throws InterruptedIOException,
*
* @author Martin Entlicher
*/
public class CmdlineDiffProvider extends DiffProvider implements java.io.Serializable {
//private static final String REVISION_STR = "retrieving revision";
public static final String DIFF_REGEXP = "(^[0-9]+(,[0-9]+|)[d][0-9]+$)|"+
"(^[0-9]+(,[0-9]+|)[c][0-9]+(,[0-9]+|)$)|"+
"(^[0-9]+[a][0-9]+(,[0-9]+|)$)";
private static final int BUFF_LENGTH = 1024;
private String diffCmd;
private static final Pattern pattern = Pattern.compile(DIFF_REGEXP);
//private transient StringBuffer firstText;
//private transient StringBuffer secondText;
static final long serialVersionUID =4101521743158176210L;
/** Creates new CmdlineDiffProvider
* @param diffCmd The diff command. Must contain "{0}" and "{1}", which
* will be replaced with the files being compared.
*/
public CmdlineDiffProvider(String diffCmd) {
this.diffCmd = diffCmd;
//firstText = new StringBuffer();
//secondText = new StringBuffer();
}
public static CmdlineDiffProvider createDefault() {
return new CmdlineDiffProvider("diff {0} {1}"); // NOI18N
}
/**
* Set a new diff command.
* @param diffCmd The diff command. Must contain "{0}" and "{1}", which
* will be replaced with the files being compared.
*/
public void setDiffCommand(String diffCmd) {
this.diffCmd = diffCmd;
}
/**
* Get the diff command being used.
*/
public String getDiffCommand() {
return diffCmd;
}
private static boolean checkEmpty(String str, String element) {
if (str == null || str.length() == 0) {
/*
if (this.stderrListener != null) {
String[] elements = { "Bad format of diff result: "+element }; // NOI18N
stderrListener.match(elements);
}
*/
//Edeb("Bad format of diff result: "+element); // NOI18N
return true;
}
return false;
}
/**
* Create the differences of the content two streams.
* @param r1 the first source
* @param r2 the second source to be compared with the first one.
* @return the list of differences found, instances of {@link Difference};
* or <code>null</code> when some error occured.
*/
public Diff computeDiff(Reader r1, Reader r2) throws IOException {
File f1 = null;
File f2 = null;
try {
f1 = File.createTempFile("TempDiff".intern(), null);
f2 = File.createTempFile("TempDiff".intern(), null);
FileWriter fw1 = new FileWriter(f1);
FileWriter fw2 = new FileWriter(f2);
char[] buffer = new char[BUFF_LENGTH];
int length;
while((length = r1.read(buffer)) > 0) fw1.write(buffer, 0, length);
while((length = r2.read(buffer)) > 0) fw2.write(buffer, 0, length);
r1.close();
r2.close();
fw1.close();
fw2.close();
return createDiff(f1, f2);
} finally {
if (f1 != null) f1.delete();
if (f2 != null) f2.delete();
}
}
/**
* Executes (possibly broken) external program.
*/
private Diff createDiff(File f1, File f2) throws IOException {
final StringBuffer firstText = new StringBuffer();
final StringBuffer secondText = new StringBuffer();
diffCmd = diffCmd.replace("\"{0}\"", "{0}").replace("\"{1}\"", "{1}"); // compatibility // NOI18N
String firstPath;
String secondPath;
if (isWindows()) {
firstPath = "\"" + f1.getAbsolutePath() + "\""; // NOI18N
secondPath = "\"" + f2.getAbsolutePath() + "\""; // NOI18N
} else {
firstPath = f1.getAbsolutePath();
secondPath = f2.getAbsolutePath();
}
final String cmd = java.text.MessageFormat.format(diffCmd, firstPath, secondPath);
final Process p[] = new Process[1];
final Object[] ret = new Object[1];
Runnable cancellableProcessWrapper = new Runnable() {
public void run() {
try {
LOGGER.fine("#69616 CDP: executing: " + cmd); // NOI18N
synchronized(p) {
p[0] = Runtime.getRuntime().exec(cmd);
}
Reader stdout = new InputStreamReader(p[0].getInputStream());
char[] buffer = new char[BUFF_LENGTH];
StringBuilder outBuffer = new StringBuilder();
int length;
Diff differences = new Diff();
while ((length = stdout.read(buffer)) > 0) {
for (int i = 0; i < length; i++) {
if (buffer[i] == '\n') {
//stdoutNextLine(outBuffer.toString(), differences);
outputLine(outBuffer.toString(), pattern, differences,
firstText, secondText);
outBuffer.delete(0, outBuffer.length());
} else {
if (buffer[i] != 13) {
outBuffer.append(buffer[i]);
}
}
}
}
if (outBuffer.length() > 0) outputLine(outBuffer.toString(), pattern, differences,
firstText, secondText);
setTextOnLastDifference(differences, firstText, secondText);
ret[0] = differences;
} catch (IOException ioex) {
ret[0] = new IOException("Failed to execute: "+cmd).initCause(ioex);
}
}
};
Thread t = new Thread(cancellableProcessWrapper, "Diff.exec()"); // NOI18N
t.start();
try {
t.join();
synchronized(ret) {
if (ret[0] instanceof IOException) {
throw (IOException) ret[0];
}
return (Diff) ret[0];
}
} catch (InterruptedException e) {
synchronized(p[0]) {
p[0].destroy();
}
throw new InterruptedIOException();
}
}
private boolean isWindows() {
return File.pathSeparatorChar==';';
}
public static void setTextOnLastDifference(List<Difference> differences,
StringBuffer firstText, StringBuffer secondText) {
if (differences.size() > 0) {
String t1 = firstText.toString();
if (t1.length() == 0) t1 = null;
String t2 = secondText.toString();
if (t2.length() == 0) t2 = null;
Difference d = differences.remove(differences.size() - 1);
differences.add(new Difference(d.getType(), d.getFirstStart(), d.getFirstEnd(),
d.getSecondStart(), d.getSecondEnd(), t1, t2));
firstText.delete(0, firstText.length());
secondText.delete(0, secondText.length());
}
}
/**
* This method is called, with elements of the output data.
* @param elements the elements of output data.
*/
//private void outputData(String[] elements, List differences) {
public static void outputLine(String elements, Pattern pattern, List<Difference> differences,
StringBuffer firstText, StringBuffer secondText) {
//diffBuffer.append(elements[0]+"\n"); // NOI18N
//D.deb("diff match: "+elements[0]); // NOI18N
//System.out.println("diff outputData: "+elements[0]); // NOI18N
int index, commaIndex;
int n1, n2, n3, n4;
String nStr;
if (pattern.matcher(elements).matches()) {
setTextOnLastDifference(differences, firstText, secondText);
} else {
if (elements.startsWith("< ")) {
firstText.append(elements.substring(2) + "\n");
}
if (elements.startsWith("> ")) {
secondText.append(elements.substring(2) + "\n");
}
return ;
}
if ((index = elements.indexOf('a')) >= 0) {
//DiffAction action = new DiffAction();
try {
n1 = Integer.parseInt(elements.substring(0, index));
index++;
commaIndex = elements.indexOf(',', index);
if (commaIndex < 0) {
nStr = elements.substring(index, elements.length());
if (checkEmpty(nStr, elements)) return;
n3 = Integer.parseInt(nStr);
n4 = n3;
} else {
nStr = elements.substring(index, commaIndex);
if (checkEmpty(nStr, elements)) return;
n3 = Integer.parseInt(nStr);
nStr = elements.substring(commaIndex+1, elements.length());
if (nStr == null || nStr.length() == 0) n4 = n3;
else n4 = Integer.parseInt(nStr);
}
} catch (NumberFormatException e) {
/*
if (this.stderrListener != null) {
String[] debugOut = { "NumberFormatException "+e.getMessage() }; // NOI18N
stderrListener.match(debugOut);
}
*/
//Edeb("NumberFormatException "+e.getMessage()); // NOI18N
return;
}
//action.setAddAction(n1, n3, n4);
//diffActions.add(action);
differences.add(new Difference(Difference.ADD, n1, 0, n3, n4));
} else if ((index = elements.indexOf('d')) >= 0) {
//DiffAction action = new DiffAction();
commaIndex = elements.lastIndexOf(',', index);
try {
if (commaIndex < 0) {
n1 = Integer.parseInt(elements.substring(0, index));
n2 = n1;
} else {
nStr = elements.substring(0, commaIndex);
if (checkEmpty(nStr, elements)) return;
n1 = Integer.parseInt(nStr);
nStr = elements.substring(commaIndex+1, index);
if (checkEmpty(nStr, elements)) return;
n2 = Integer.parseInt(nStr);
}
nStr = elements.substring(index+1, elements.length());
if (checkEmpty(nStr, elements)) return;
n3 = Integer.parseInt(nStr);
} catch (NumberFormatException e) {
/*
if (this.stderrListener != null) {
String[] debugOut = { "NumberFormatException "+e.getMessage() }; // NOI18N
stderrListener.match(debugOut);
}
*/
//Edeb("NumberFormatException "+e.getMessage()); // NOI18N
return;
}
//action.setDeleteAction(n1, n2, n3);
//diffActions.add(action);
differences.add(new Difference(Difference.DELETE, n1, n2, n3, 0));
} else if ((index = elements.indexOf('c')) >= 0) {
//DiffAction action = new DiffAction();
commaIndex = elements.lastIndexOf(',', index);
try {
if (commaIndex < 0) {
n1 = Integer.parseInt(elements.substring(0, index));
n2 = n1;
} else {
nStr = elements.substring(0, commaIndex);
if (checkEmpty(nStr, elements)) return;
n1 = Integer.parseInt(nStr);
nStr = elements.substring(commaIndex+1, index);
if (checkEmpty(nStr, elements)) return;
n2 = Integer.parseInt(nStr);
}
index++;
commaIndex = elements.indexOf(',', index);
if (commaIndex < 0) {
nStr = elements.substring(index, elements.length());
if (checkEmpty(nStr, elements)) return;
n3 = Integer.parseInt(nStr);
n4 = n3;
} else {
nStr = elements.substring(index, commaIndex);
if (checkEmpty(nStr, elements)) return;
n3 = Integer.parseInt(nStr);
nStr = elements.substring(commaIndex+1, elements.length());
if (nStr == null || nStr.length() == 0) n4 = n3;
else n4 = Integer.parseInt(nStr);
}
} catch (NumberFormatException e) {
/*
if (this.stderrListener != null) {
String[] debugOut = { "NumberFormatException "+e.getMessage() }; // NOI18N
stderrListener.match(debugOut);
}
*/
//Edeb("NumberFormatException "+e.getMessage()); // NOI18N
return;
}
//action.setChangeAction(n1, n2, n3, n4);
//diffActions.add(action);
differences.add(new Difference(Difference.CHANGE, n1, n2, n3, n4));
}
}
private static final Logger LOGGER = Logger.getLogger(CmdlineDiffProvider.class.getName());
}