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Make whitespace (' ', \t, \r, \n) always visible for "changed" lines
context lines, added-only lines, and removed-only lines are shown as usual in the diffs. fixes diffplug#465
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206 changes: 206 additions & 0 deletions
206
...a/src/main/java/com/diffplug/spotless/extra/integration/WriteSpaceAwareDiffFormatter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,206 @@ | ||
| /* | ||
| * Copyright 2016 DiffPlug | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.diffplug.spotless.extra.integration; | ||
|
|
||
| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
| import java.nio.charset.Charset; | ||
| import java.nio.charset.CharsetEncoder; | ||
| import java.nio.charset.StandardCharsets; | ||
|
|
||
| import org.eclipse.jgit.diff.Edit; | ||
| import org.eclipse.jgit.diff.EditList; | ||
| import org.eclipse.jgit.diff.RawText; | ||
| import org.eclipse.jgit.util.IntList; | ||
| import org.eclipse.jgit.util.RawParseUtils; | ||
|
|
||
| /** | ||
| * Formats the diff in Git-like style, however it makes whitespace visible for | ||
| * edit-like diffs (when one fragment is replaced with another). | ||
| */ | ||
| class WriteSpaceAwareDiffFormatter { | ||
| private static final int CONTEXT_LINES = 3; | ||
| private static final String MIDDLE_DOT = "\u00b7"; | ||
| private static final String CR = "\u240d"; | ||
| private static final String LF = "\u240a"; | ||
| private static final String TAB = "\u21e5"; | ||
| private static final byte[] MIDDLE_DOT_UTF8 = MIDDLE_DOT.getBytes(StandardCharsets.UTF_8); | ||
| private static final byte[] CR_UTF8 = CR.getBytes(StandardCharsets.UTF_8); | ||
| private static final byte[] LF_UTF8 = LF.getBytes(StandardCharsets.UTF_8); | ||
| private static final byte[] TAB_UTF8 = TAB.getBytes(StandardCharsets.UTF_8); | ||
| private static final byte[] SPACE_SIMPLE = new byte[]{' '}; | ||
| private static final byte[] CR_SIMPLE = new byte[]{'\\', 'r'}; | ||
| private static final byte[] LF_SIMPLE = new byte[]{'\\', 'n'}; | ||
| private static final byte[] TAB_SIMPLE = new byte[]{'\\', 't'}; | ||
|
|
||
| private final ByteArrayOutputStream out; | ||
| private final byte[] middleDot; | ||
| private final byte[] cr; | ||
| private final byte[] lf; | ||
| private final byte[] tab; | ||
|
|
||
| /** | ||
| * Creates the formatter. | ||
| * @param out output stream for the resulting diff. The diff would have \n line endings | ||
| * @param charset the charset that will be used when printing the results for the end user | ||
| */ | ||
| public WriteSpaceAwareDiffFormatter(ByteArrayOutputStream out, Charset charset) { | ||
| this.out = out; | ||
| CharsetEncoder charsetEncoder = charset.newEncoder(); | ||
| this.middleDot = replacementFor(charsetEncoder, MIDDLE_DOT, MIDDLE_DOT_UTF8, SPACE_SIMPLE); | ||
| this.cr = replacementFor(charsetEncoder, CR, CR_UTF8, CR_SIMPLE); | ||
| this.lf = replacementFor(charsetEncoder, LF, LF_UTF8, LF_SIMPLE); | ||
| this.tab = replacementFor(charsetEncoder, TAB, TAB_UTF8, TAB_SIMPLE); | ||
| } | ||
|
|
||
| private static byte[] replacementFor(CharsetEncoder charsetEncoder, String value, byte[] fancy, byte[] simple) { | ||
| return charsetEncoder.canEncode(value) ? fancy : simple; | ||
| } | ||
|
|
||
| /** | ||
| * Formats the diff. | ||
| * @param edits the list of edits to format | ||
| * @param a input text a, with \n line endings, with UTF-8 encoding | ||
| * @param b input text b, with \n line endings, with UTF-8 encoding | ||
| * @throws IOException if formatting fails | ||
| */ | ||
| public void format(EditList edits, RawText a, RawText b) throws IOException { | ||
| IntList linesA = RawParseUtils.lineMap(a.getRawContent(), 0, a.getRawContent().length); | ||
| IntList linesB = RawParseUtils.lineMap(b.getRawContent(), 0, b.getRawContent().length); | ||
| boolean firstLine = true; | ||
| for (int i = 0; i < edits.size(); i++) { | ||
| Edit edit = edits.get(i); | ||
| int lineA = Math.max(0, edit.getBeginA() - CONTEXT_LINES); | ||
| int lineB = Math.max(0, edit.getBeginB() - CONTEXT_LINES); | ||
|
|
||
| final int endIdx = findCombinedEnd(edits, i); | ||
| final Edit endEdit = edits.get(endIdx); | ||
|
|
||
| int endA = Math.min(a.size(), endEdit.getEndA() + CONTEXT_LINES); | ||
| int endB = Math.min(b.size(), endEdit.getEndB() + CONTEXT_LINES); | ||
|
|
||
| if (firstLine) { | ||
| firstLine = false; | ||
| } else { | ||
| out.write('\n'); | ||
| } | ||
| header(lineA, endA, lineB, endB); | ||
|
|
||
| boolean showWhitespace = edit.getType() == Edit.Type.REPLACE; | ||
|
|
||
| while (lineA < endA || lineB < endB) { | ||
| if (lineA < edit.getBeginA()) { | ||
| // Common part before the diff | ||
| line(' ', a, lineA, linesA, false); | ||
| lineA++; | ||
| lineB++; | ||
| } else if (lineA < edit.getEndA()) { | ||
| line('-', a, lineA, linesA, showWhitespace); | ||
| lineA++; | ||
| } else if (lineB < edit.getEndB()) { | ||
| line('+', b, lineB, linesB, showWhitespace); | ||
| lineB++; | ||
| } else { | ||
| // Common part after the diff | ||
| line(' ', a, lineA, linesA, false); | ||
| lineA++; | ||
| lineB++; | ||
| } | ||
|
|
||
| if (lineA == edit.getEndA() && lineB == edit.getEndB() && i < endIdx) { | ||
| i++; | ||
| edit = edits.get(i); | ||
| showWhitespace = edit.getType() == Edit.Type.REPLACE; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * There might be multiple adjacent diffs, so we need to figure out the latest one in the group. | ||
| * @param edits list of edits | ||
| * @param i starting edit | ||
| * @return the index of the latest edit in the group | ||
| */ | ||
| private int findCombinedEnd(EditList edits, int i) { | ||
| for (; i < edits.size() - 1; i++) { | ||
| Edit current = edits.get(i); | ||
| Edit next = edits.get(i + 1); | ||
| if (current.getEndA() - next.getBeginA() > 2 * CONTEXT_LINES && | ||
| current.getEndB() - next.getBeginB() > 2 * CONTEXT_LINES) { | ||
| break; | ||
| } | ||
| } | ||
| return i; | ||
| } | ||
|
|
||
| private void header(int lineA, int endA, int lineB, int endB) { | ||
| out.write('@'); | ||
| out.write('@'); | ||
| range('-', lineA + 1, endA - lineA); | ||
| range('+', lineB + 1, endB - lineB); | ||
| out.write(' '); | ||
| out.write('@'); | ||
| out.write('@'); | ||
| } | ||
|
|
||
| private void range(char prefix, int begin, int length) { | ||
| out.write(' '); | ||
| out.write(prefix); | ||
| if (length == 0) { | ||
| writeInt(begin - 1); | ||
| out.write(','); | ||
| out.write('0'); | ||
| } else { | ||
| writeInt(begin); | ||
| if (length > 1) { | ||
| out.write(','); | ||
| writeInt(length); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private void writeInt(int num) { | ||
| String str = Integer.toString(num); | ||
| for (int i = 0, len = str.length(); i < len; i++) { | ||
| out.write(str.charAt(i)); | ||
| } | ||
| } | ||
|
|
||
| private void line(char prefix, RawText a, int lineA, IntList lines, boolean showWhitespace) throws IOException { | ||
| out.write('\n'); | ||
| out.write(prefix); | ||
| if (!showWhitespace) { | ||
| a.writeLine(out, lineA); | ||
| return; | ||
| } | ||
| byte[] bytes = a.getRawContent(); | ||
| for (int i = lines.get(lineA + 1), end = lines.get(lineA + 2); i < end; i++) { | ||
| byte b = bytes[i]; | ||
| if (b == ' ') { | ||
| out.write(middleDot); | ||
| } else if (b == '\t') { | ||
| out.write(tab); | ||
| } else if (b == '\r') { | ||
| out.write(cr); | ||
| } else if (b == '\n') { | ||
| out.write(lf); | ||
| } else { | ||
| out.write(b); | ||
| } | ||
| } | ||
| } | ||
| } |
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