CombinedHunkHeader.java
- /*
- * Copyright (C) 2008, Google Inc. and others
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Distribution License v. 1.0 which is available at
- * https://www.eclipse.org/org/documents/edl-v10.php.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
- 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 abstract static class CombinedOldImage extends OldImage {
- int nContext;
- }
- private CombinedOldImage[] old;
- CombinedHunkHeader(CombinedFileHeader fh, 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);
- }
- };
- }
- }
- /** {@inheritDoc} */
- @Override
- public CombinedFileHeader getFileHeader() {
- return (CombinedFileHeader) super.getFileHeader();
- }
- /** {@inheritDoc} */
- @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(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 (CombinedOldImage o : old) {
- o.startLine = -parseBase10(buf, ptr.value, ptr);
- if (buf[ptr.value] == ',') {
- o.lineCount = parseBase10(buf, ptr.value + 1, ptr);
- } else {
- o.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(Patch script, int end) {
- final byte[] buf = file.buf;
- int c = nextLF(buf, startOffset);
- for (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(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);
- }
- }
- }
- @Override
- 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);
- }
- }
- }
- }