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/*
* Copyright (C) 2009, Christian Halstrick <christian.halstrick@sap.com>
* Copyright (C) 2014, André de Oliveira <andre.oliveira@liferay.com> 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.merge;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.List;
import org.eclipse.jgit.diff.RawText;
import org.eclipse.jgit.merge.MergeChunk.ConflictState;
class MergeFormatterPass {
private final EolAwareOutputStream out;
private final MergeResult<RawText> res;
private final List<String> seqName;
private final Charset charset;
private final boolean threeWayMerge;
private final boolean writeBase; // diff3-style requested
private String lastConflictingName; // is set to non-null whenever we are in
// a conflict
/**
* @param out
* the {@link java.io.OutputStream} where to write the textual
* presentation
* @param res
* the merge result which should be presented
* @param seqName
* When a conflict is reported each conflicting range will get a
* name. This name is following the "<<<<<<<
* " or ">>>>>>> " conflict markers. The
* names for the sequences are given in this list
* @param charset
* the character set used when writing conflict metadata
*/
MergeFormatterPass(OutputStream out, MergeResult<RawText> res,
List<String> seqName, Charset charset) {
this(out, res, seqName, charset, false);
}
/**
* @param out
* the {@link java.io.OutputStream} where to write the textual
* presentation
* @param res
* the merge result which should be presented
* @param seqName
* When a conflict is reported each conflicting range will get a
* name. This name is following the "<<<<<<<
* ", "|||||||" or ">>>>>>> " conflict
* markers. The names for the sequences are given in this list
* @param charset
* the character set used when writing conflict metadata
* @param writeBase
* base's contribution should be written in conflicts
*/
MergeFormatterPass(OutputStream out, MergeResult<RawText> res,
List<String> seqName, Charset charset, boolean writeBase) {
this.out = new EolAwareOutputStream(out);
this.res = res;
this.seqName = seqName;
this.charset = charset;
this.threeWayMerge = (res.getSequences().size() == 3);
this.writeBase = writeBase;
}
void formatMerge() throws IOException {
boolean missingNewlineAtEnd = false;
for (MergeChunk chunk : res) {
if (!isBase(chunk) || writeBase) {
RawText seq = res.getSequences().get(chunk.getSequenceIndex());
writeConflictMetadata(chunk);
// the lines with conflict-metadata are written. Now write the
// chunk
for (int i = chunk.getBegin(); i < chunk.getEnd(); i++)
writeLine(seq, i);
missingNewlineAtEnd = seq.isMissingNewlineAtEnd();
}
}
// one possible leftover: if the merge result ended with a conflict we
// have to close the last conflict here
if (lastConflictingName != null)
writeConflictEnd();
if (!missingNewlineAtEnd)
out.beginln();
}
private void writeConflictMetadata(MergeChunk chunk) throws IOException {
if (lastConflictingName != null
&& !isTheirs(chunk) && !isBase(chunk)) {
// found the end of a conflict
writeConflictEnd();
}
if (isOurs(chunk)) {
// found the start of a conflict
writeConflictStart(chunk);
} else if (isTheirs(chunk)) {
// found the theirs conflicting chunk
writeConflictChange(chunk);
} else if (isBase(chunk)) {
// found the base conflicting chunk
writeConflictBase(chunk);
}
}
private void writeConflictEnd() throws IOException {
writeln(">>>>>>> " + lastConflictingName); //$NON-NLS-1$
lastConflictingName = null;
}
private void writeConflictStart(MergeChunk chunk) throws IOException {
lastConflictingName = seqName.get(chunk.getSequenceIndex());
writeln("<<<<<<< " + lastConflictingName); //$NON-NLS-1$
}
private void writeConflictChange(MergeChunk chunk) throws IOException {
/*
* In case of a non-three-way merge I'll add the name of the conflicting
* chunk behind the equal signs. I also append the name of the last
* conflicting chunk after the ending greater-than signs. If somebody
* knows a better notation to present non-three-way merges - feel free
* to correct here.
*/
lastConflictingName = seqName.get(chunk.getSequenceIndex());
writeln(threeWayMerge ? "=======" : "======= " //$NON-NLS-1$ //$NON-NLS-2$
+ lastConflictingName);
}
private void writeConflictBase(MergeChunk chunk) throws IOException {
lastConflictingName = seqName.get(chunk.getSequenceIndex());
writeln("||||||| " + lastConflictingName); //$NON-NLS-1$
}
private void writeln(String s) throws IOException {
out.beginln();
out.write((s + "\n").getBytes(charset)); //$NON-NLS-1$
}
private void writeLine(RawText seq, int i) throws IOException {
out.beginln();
seq.writeLine(out, i);
// still BOL? It was a blank line. But writeLine won't lf, so we do.
if (out.isBeginln())
out.write('\n');
}
private boolean isBase(MergeChunk chunk) {
return chunk.getConflictState() == ConflictState.BASE_CONFLICTING_RANGE;
}
private boolean isOurs(MergeChunk chunk) {
return chunk
.getConflictState() == ConflictState.FIRST_CONFLICTING_RANGE;
}
private boolean isTheirs(MergeChunk chunk) {
return chunk.getConflictState() == ConflictState.NEXT_CONFLICTING_RANGE;
}
}
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