/*
* Copyright (C) 2008, Google Inc.
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.patch;
import static org.eclipse.jgit.util.RawParseUtils.nextLF;
import static org.eclipse.jgit.util.RawParseUtils.parseBase10;
import java.io.IOException;
import java.io.OutputStream;
import java.text.MessageFormat;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.AbbreviatedObjectId;
import org.eclipse.jgit.util.MutableInteger;
/** Hunk header for a hunk appearing in a "diff --cc" style patch. */
public class CombinedHunkHeader extends HunkHeader {
private static abstract class CombinedOldImage extends OldImage {
int nContext;
}
private CombinedOldImage[] old;
CombinedHunkHeader(final CombinedFileHeader fh, final int offset) {
super(fh, offset, null);
old = new CombinedOldImage[fh.getParentCount()];
for (int i = 0; i < old.length; i++) {
final int imagePos = i;
old[i] = new CombinedOldImage() {
@Override
public AbbreviatedObjectId getId() {
return fh.getOldId(imagePos);
}
};
}
}
@Override
public CombinedFileHeader getFileHeader() {
return (CombinedFileHeader) super.getFileHeader();
}
@Override
public OldImage getOldImage() {
return getOldImage(0);
}
/**
* Get the OldImage data related to the nth ancestor
*
* @param nthParent
* the ancestor to get the old image data of
* @return image data of the requested ancestor.
*/
public OldImage getOldImage(final int nthParent) {
return old[nthParent];
}
@Override
void parseHeader() {
// Parse "@@@ -55,12 -163,13 +163,15 @@@ protected boolean"
//
final byte[] buf = file.buf;
final MutableInteger ptr = new MutableInteger();
ptr.value = nextLF(buf, startOffset, ' ');
for (int n = 0; n < old.length; n++) {
old[n].startLine = -parseBase10(buf, ptr.value, ptr);
if (buf[ptr.value] == ',')
old[n].lineCount = parseBase10(buf, ptr.value + 1, ptr);
else
old[n].lineCount = 1;
}
newStartLine = parseBase10(buf, ptr.value + 1, ptr);
if (buf[ptr.value] == ',')
newLineCount = parseBase10(buf, ptr.value + 1, ptr);
else
newLineCount = 1;
}
@Override
int parseBody(final Patch script, final int end) {
final byte[] buf = file.buf;
int c = nextLF(buf, startOffset);
for (final CombinedOldImage o : old) {
o.nDeleted = 0;
o.nAdded = 0;
o.nContext = 0;
}
nContext = 0;
int nAdded = 0;
SCAN: for (int eol; c < end; c = eol) {
eol = nextLF(buf, c);
if (eol - c < old.length + 1) {
// Line isn't long enough to mention the state of each
// ancestor. It must be the end of the hunk.
break SCAN;
}
switch (buf[c]) {
case ' ':
case '-':
case '+':
break;
default:
// Line can't possibly be part of this hunk; the first
// ancestor information isn't recognizable.
//
break SCAN;
}
int localcontext = 0;
for (int ancestor = 0; ancestor < old.length; ancestor++) {
switch (buf[c + ancestor]) {
case ' ':
localcontext++;
old[ancestor].nContext++;
continue;
case '-':
old[ancestor].nDeleted++;
continue;
case '+':
old[ancestor].nAdded++;
nAdded++;
continue;
default:
break SCAN;
}
}
if (localcontext == old.length)
nContext++;
}
for (int ancestor = 0; ancestor < old.length; ancestor++) {
final CombinedOldImage o = old[ancestor];
final int cmp = o.nContext + o.nDeleted;
if (cmp < o.lineCount) {
final int missingCnt = o.lineCount - cmp;
script.error(buf, startOffset, MessageFormat.format(
JGitText.get().truncatedHunkLinesMissingForAncestor,
Integer.valueOf(missingCnt),
Integer.valueOf(ancestor + 1)));
}
}
if (nContext + nAdded < newLineCount) {
final int missingCount = newLineCount - (nContext + nAdded);
script.error(buf, startOffset, MessageFormat.format(
JGitText.get().truncatedHunkNewLinesMissing,
Integer.valueOf(missingCount)));
}
return c;
}
@Override
void extractFileLines(final OutputStream[] out) throws IOException {
final byte[] buf = file.buf;
int ptr = startOffset;
int eol = nextLF(buf, ptr);
if (endOffset <= eol)
return;
// Treat the hunk header as though it were from the ancestor,
// as it may have a function header appearing after it which
// was copied out of the ancestor file.
//
out[0].write(buf, ptr, eol - ptr);
SCAN: for (ptr = eol; ptr < endOffset; ptr = eol) {
eol = nextLF(buf, ptr);
if (eol - ptr < old.length + 1) {
// Line isn't long enough to mention the state of each
// ancestor. It must be the end of the hunk.
break SCAN;
}
switch (buf[ptr]) {
case ' ':
case '-':
case '+':
break;
default:
// Line can't possibly be part of this hunk; the first
// ancestor information isn't recognizable.
//
break SCAN;
}
int delcnt = 0;
for (int ancestor = 0; ancestor < old.length; ancestor++) {
switch (buf[ptr + ancestor]) {
case '-':
delcnt++;
out[ancestor].write(buf, ptr, eol - ptr);
continue;
case ' ':
out[ancestor].write(buf, ptr, eol - ptr);
continue;
case '+':
continue;
default:
break SCAN;
}
}
if (delcnt < old.length) {
// This line appears in the new file if it wasn't deleted
// relative to all ancestors.
//
out[old.length].write(buf, ptr, eol - ptr);
}
}
}
void extractFileLines(final StringBuilder sb, final String[] text,
final int[] offsets) {
final byte[] buf = file.buf;
int ptr = startOffset;
int eol = nextLF(buf, ptr);
if (endOffset <= eol)
return;
copyLine(sb, text, offsets, 0);
SCAN: for (ptr = eol; ptr < endOffset; ptr = eol) {
eol = nextLF(buf, ptr);
if (eol - ptr < old.length + 1) {
// Line isn't long enough to mention the state of each
// ancestor. It must be the end of the hunk.
break SCAN;
}
switch (buf[ptr]) {
case ' ':
case '-':
case '+':
break;
default:
// Line can't possibly be part of this hunk; the first
// ancestor information isn't recognizable.
//
break SCAN;
}
boolean copied = false;
for (int ancestor = 0; ancestor < old.length; ancestor++) {
switch (buf[ptr + ancestor]) {
case ' ':
case '-':
if (copied)
skipLine(text, offsets, ancestor);
else {
copyLine(sb, text, offsets, ancestor);
copied = true;
}
continue;
case '+':
continue;
default:
break SCAN;
}
}
if (!copied) {
// If none of the ancestors caused the copy then this line
// must be new across the board, so it only appears in the
// text of the new file.
//
copyLine(sb, text, offsets, old.length);
}
}
}
}