tests/org.eclipse.dltk.javascript.formatter.tests/src/org/eclipse/dltk/javascript/internal/parser/tests/JavaScriptParserTester.java

/*******************************************************************************
 * Copyright (c) 2009, 2016 xored software, Inc. and others.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0  
 *
 * Contributors:
 *     xored software, Inc. - initial API and Implementation (Vladimir Belov)
 *******************************************************************************/

package org.eclipse.dltk.javascript.internal.parser.tests;

import org.eclipse.dltk.javascript.formatter.JavaScriptFormatter;
import org.eclipse.dltk.javascript.formatter.JavaScriptFormatterConstants;
import org.eclipse.dltk.javascript.formatter.tests.JavaScriptFormatterTestsPlugin;
import org.eclipse.dltk.ui.formatter.IScriptFormatter;
import org.eclipse.jface.text.Document;
import org.eclipse.text.edits.TextEdit;
import org.junit.Assert;

public class JavaScriptParserTester extends AbstractTester {

	private void parseScript(String source) throws Exception {

		IScriptFormatter formatter = new JavaScriptFormatter("\n",
				JavaScriptFormatterConstants.getDefaults());

		TextEdit textEdit = formatter.format(source, 0, source.length(), 0);

		Assert.assertNotNull(textEdit);

		Document doc = new Document(source);
		textEdit.apply(doc);
		String formatted = doc.get();

		Assert.assertTrue(
				"There are no changes in formatted document, format() fails!",
				!source.equals(formatted));

		ANTLRTokenStreamComparer.compare(source, formatted, true);

		TextEdit edit = formatter.format(formatted, 0, formatted.length(), 0);
		Document document = new Document(formatted);
		edit.apply(document);
		String reformatted = document.get();

		// Formatting formatted text MUST NOT change it again!
		Assert.assertEquals(formatted, reformatted);

	}

	public static void parse(String resourceName) throws Exception {
		parse(resourceName, JavaScriptFormatterTestsPlugin.CONTEXT.getCharset());
	}

	public static void parse(String resourceName, String charset)
			throws Exception {
		new JavaScriptParserTester()
				.parseScript(getScriptContent(resourceName, charset));
	}

	public static void parseSource(String source) throws Exception {
		new JavaScriptParserTester().parseScript(source);
	}
}