org.eclipse.jgit/src/org/eclipse/jgit/patch/CombinedHunkHeader.java - jgit - Git at Google

 /*
  * 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(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);
 			}
 		}
 	}
 }
	/*
	* 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(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);
	}
	}
	}
	}