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130 changes: 130 additions & 0 deletions
130
org.eclipse.jdt.ls.core/src/com/google/googlejavaformat/java/GoogleJavaFormatter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| package com.google.googlejavaformat.java; | ||
|
|
||
| import com.google.common.base.Preconditions; | ||
| import com.google.common.collect.Range; | ||
| import com.google.googlejavaformat.java.SnippetFormatter.SnippetKind; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import org.eclipse.jdt.core.dom.ASTParser; | ||
| import org.eclipse.jdt.core.formatter.CodeFormatter; | ||
| import org.eclipse.jface.text.IRegion; | ||
| import org.eclipse.jface.text.Region; | ||
| import org.eclipse.text.edits.MultiTextEdit; | ||
| import org.eclipse.text.edits.ReplaceEdit; | ||
| import org.eclipse.text.edits.TextEdit; | ||
|
|
||
| /** Runs the Google Java formatter on the given code. */ | ||
| public class GoogleJavaFormatter extends CodeFormatter { | ||
|
|
||
| private static final int INDENTATION_SIZE = 2; | ||
|
|
||
| @Override | ||
| public TextEdit format( | ||
| int kind, String source, int offset, int length, int indentationLevel, String lineSeparator) { | ||
| IRegion[] regions = new IRegion[] {new Region(offset, length)}; | ||
| return formatInternal(kind, source, regions, indentationLevel); | ||
| } | ||
|
|
||
| @Override | ||
| public TextEdit format( | ||
| int kind, String source, IRegion[] regions, int indentationLevel, String lineSeparator) { | ||
| return formatInternal(kind, source, regions, indentationLevel); | ||
| } | ||
|
|
||
| @Override | ||
| public String createIndentationString(int indentationLevel) { | ||
| Preconditions.checkArgument( | ||
| indentationLevel >= 0, | ||
| "Indentation level cannot be less than zero. Given: %s", | ||
| indentationLevel); | ||
| int spaces = indentationLevel * INDENTATION_SIZE; | ||
| StringBuilder buf = new StringBuilder(spaces); | ||
| for (int i = 0; i < spaces; i++) { | ||
| buf.append(' '); | ||
| } | ||
| return buf.toString(); | ||
| } | ||
|
|
||
| /** Runs the Google Java formatter on the given source, with only the given ranges specified. */ | ||
| private TextEdit formatInternal(int kind, String source, IRegion[] regions, int initialIndent) { | ||
| try { | ||
| boolean includeComments = | ||
| (kind & CodeFormatter.F_INCLUDE_COMMENTS) == CodeFormatter.F_INCLUDE_COMMENTS; | ||
| kind &= ~CodeFormatter.F_INCLUDE_COMMENTS; | ||
| SnippetKind snippetKind; | ||
| switch (kind) { | ||
| case ASTParser.K_EXPRESSION: | ||
| snippetKind = SnippetKind.EXPRESSION; | ||
| break; | ||
| case ASTParser.K_STATEMENTS: | ||
| snippetKind = SnippetKind.STATEMENTS; | ||
| break; | ||
| case ASTParser.K_CLASS_BODY_DECLARATIONS: | ||
| snippetKind = SnippetKind.CLASS_BODY_DECLARATIONS; | ||
| break; | ||
| case ASTParser.K_COMPILATION_UNIT: | ||
| snippetKind = SnippetKind.COMPILATION_UNIT; | ||
| break; | ||
| default: | ||
| throw new IllegalArgumentException(String.format("Unknown snippet kind: %d", kind)); | ||
| } | ||
| List<Replacement> replacements = | ||
| new SnippetFormatter() | ||
| .format( | ||
| snippetKind, source, rangesFromRegions(regions), initialIndent, includeComments); | ||
| if (idempotent(source, regions, replacements)) { | ||
| // Do not create edits if there's no diff. | ||
| return null; | ||
| } | ||
| // Convert replacements to text edits. | ||
| return editFromReplacements(replacements); | ||
| } catch (IllegalArgumentException | FormatterException exception) { | ||
| // Do not format on errors. | ||
| return null; | ||
| } | ||
| } | ||
|
|
||
| private List<Range<Integer>> rangesFromRegions(IRegion[] regions) { | ||
| List<Range<Integer>> ranges = new ArrayList<>(); | ||
| for (IRegion region : regions) { | ||
| ranges.add(Range.closedOpen(region.getOffset(), region.getOffset() + region.getLength())); | ||
| } | ||
| return ranges; | ||
| } | ||
|
|
||
| /** @return {@code true} if input and output texts are equal, else {@code false}. */ | ||
| private boolean idempotent(String source, IRegion[] regions, List<Replacement> replacements) { | ||
| // This implementation only checks for single replacement. | ||
| if (replacements.size() == 1) { | ||
| Replacement replacement = replacements.get(0); | ||
| String output = replacement.getReplacementString(); | ||
| // Entire source case: input = output, nothing changed. | ||
| if (output.equals(source)) { | ||
| return true; | ||
| } | ||
| // Single region and single replacement case: if they are equal, nothing changed. | ||
| if (regions.length == 1) { | ||
| Range<Integer> range = replacement.getReplaceRange(); | ||
| String snippet = source.substring(range.lowerEndpoint(), range.upperEndpoint()); | ||
| if (output.equals(snippet)) { | ||
| return true; | ||
| } | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| private TextEdit editFromReplacements(List<Replacement> replacements) { | ||
| // Split the replacements that cross line boundaries. | ||
| TextEdit edit = new MultiTextEdit(); | ||
| for (Replacement replacement : replacements) { | ||
| Range<Integer> replaceRange = replacement.getReplaceRange(); | ||
| edit.addChild( | ||
| new ReplaceEdit( | ||
| replaceRange.lowerEndpoint(), | ||
| replaceRange.upperEndpoint() - replaceRange.lowerEndpoint(), | ||
| replacement.getReplacementString())); | ||
| } | ||
| return edit; | ||
| } | ||
| } |
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