com.diffplug.gradle.spotless.java.eclipse.EclipseFormatterStepImpl Maven / Gradle / Ivy

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Eclipse's formatter bundled for Spotless

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/*
 * 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.gradle.spotless.java.eclipse;

import java.util.Properties;

import org.eclipse.jdt.core.ToolFactory;
import org.eclipse.jdt.core.formatter.CodeFormatter;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.text.edits.TextEdit;

/** Formatter step which calls out to the Eclipse formatter. */
public class EclipseFormatterStepImpl {

	private final CodeFormatter codeFormatter;

	public EclipseFormatterStepImpl(Properties settings) {
		this.codeFormatter = ToolFactory.createCodeFormatter(settings, ToolFactory.M_FORMAT_EXISTING);
	}

	private static final String UNIX = "\n";

	public String format(String raw) throws Exception {
		TextEdit edit = codeFormatter.format(CodeFormatter.K_COMPILATION_UNIT | CodeFormatter.F_INCLUDE_COMMENTS, raw, 0, raw.length(), 0, UNIX);
		if (edit == null) {
			throw new IllegalArgumentException("Invalid java syntax for formatting.");
		} else {
			IDocument doc = new Document(raw);
			edit.apply(doc);
			return doc.get();
		}
	}
}