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Moved
PaddedCell.DirtyState to its own top-level class with new met…
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lib/src/main/java/com/diffplug/spotless/DirtyState.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| /* | ||
| * Copyright 2022 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; | ||
|
|
||
| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.io.OutputStream; | ||
| import java.nio.file.Files; | ||
| import java.util.Arrays; | ||
|
|
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| import javax.annotation.Nullable; | ||
|
|
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| /** | ||
| * The clean/dirty state of a single file. Intended use: | ||
| * - {@link #isClean()} means that the file is is clean, and there's nothing else to say | ||
| * - {@link #didNotConverge()} means that we were unable to determine a clean state | ||
| * - once you've tested the above conditions and you know that it's a dirty file with a converged state, | ||
| * then you can call {@link #writeCanonicalTo(OutputStream)} to get the canonical form of the given file. | ||
| */ | ||
| public class DirtyState { | ||
| @Nullable | ||
| private final byte[] canonicalBytes; | ||
|
|
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| DirtyState(@Nullable byte[] canonicalBytes) { | ||
| this.canonicalBytes = canonicalBytes; | ||
| } | ||
|
|
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| public boolean isClean() { | ||
| return this == isClean; | ||
| } | ||
|
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| public boolean didNotConverge() { | ||
| return this == didNotConverge; | ||
| } | ||
|
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| private byte[] canonicalBytes() { | ||
| if (canonicalBytes == null) { | ||
| throw new IllegalStateException("First make sure that {@code !isClean()} and {@code !didNotConverge()}"); | ||
| } | ||
| return canonicalBytes; | ||
| } | ||
|
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| public void writeCanonicalTo(File file) throws IOException { | ||
| Files.write(file.toPath(), canonicalBytes()); | ||
| } | ||
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| public void writeCanonicalTo(OutputStream out) throws IOException { | ||
| out.write(canonicalBytes()); | ||
| } | ||
|
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| /** Returns the DirtyState which corresponds to {@code isClean()}. */ | ||
| public static DirtyState clean() { | ||
| return isClean; | ||
| } | ||
|
|
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| static final DirtyState didNotConverge = new DirtyState(null); | ||
| static final DirtyState isClean = new DirtyState(null); | ||
|
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| public static Calculation of(Formatter formatter, File file) throws IOException { | ||
| return of(formatter, file, Files.readAllBytes(file.toPath())); | ||
| } | ||
|
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| public static Calculation of(Formatter formatter, File file, byte[] rawBytes) { | ||
| return new Calculation(formatter, file, rawBytes); | ||
| } | ||
|
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| public static class Calculation { | ||
| private final Formatter formatter; | ||
| private final File file; | ||
| private final byte[] rawBytes; | ||
| private final String raw; | ||
|
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| private Calculation(Formatter formatter, File file, byte[] rawBytes) { | ||
| this.formatter = formatter; | ||
| this.file = file; | ||
| this.rawBytes = rawBytes; | ||
| this.raw = new String(rawBytes, formatter.getEncoding()); | ||
| // check that all characters were encodable | ||
| String encodingError = EncodingErrorMsg.msg(raw, rawBytes, formatter.getEncoding()); | ||
| if (encodingError != null) { | ||
| throw new IllegalArgumentException(encodingError); | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Calculates whether the given file is dirty according to a PaddedCell invocation of the given formatter. | ||
| * DirtyState includes the clean state of the file, as well as a warning if we were not able to apply the formatter | ||
| * due to diverging idempotence. | ||
| */ | ||
| public DirtyState calculateDirtyState() { | ||
| String rawUnix = LineEnding.toUnix(raw); | ||
|
|
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| // enforce the format | ||
| String formattedUnix = formatter.compute(rawUnix, file); | ||
| // convert the line endings if necessary | ||
| String formatted = formatter.computeLineEndings(formattedUnix, file); | ||
|
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| // if F(input) == input, then the formatter is well-behaving and the input is clean | ||
| byte[] formattedBytes = formatted.getBytes(formatter.getEncoding()); | ||
| if (Arrays.equals(rawBytes, formattedBytes)) { | ||
| return isClean; | ||
| } | ||
|
|
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| // F(input) != input, so we'll do a padded check | ||
| String doubleFormattedUnix = formatter.compute(formattedUnix, file); | ||
| if (doubleFormattedUnix.equals(formattedUnix)) { | ||
| // most dirty files are idempotent-dirty, so this is a quick-short circuit for that common case | ||
| return new DirtyState(formattedBytes); | ||
| } | ||
|
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| PaddedCell cell = PaddedCell.check(formatter, file, rawUnix); | ||
| if (!cell.isResolvable()) { | ||
| return didNotConverge; | ||
| } | ||
|
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| // get the canonical bytes | ||
| String canonicalUnix = cell.canonical(); | ||
| String canonical = formatter.computeLineEndings(canonicalUnix, file); | ||
| byte[] canonicalBytes = canonical.getBytes(formatter.getEncoding()); | ||
| if (!Arrays.equals(rawBytes, canonicalBytes)) { | ||
| // and write them to disk if needed | ||
| return new DirtyState(canonicalBytes); | ||
| } else { | ||
| return isClean; | ||
| } | ||
| } | ||
| } | ||
| } |
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