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Eclipse Compiler for Java(TM)

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/*******************************************************************************
 * Copyright (c) 2000, 2019 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.parser;

public interface ConflictedParser {

	/* Return true if at the configuration the parser finds itself in, token would need to be disambiguated.
	   At Java SE 8 time, we have three tokens that need to clarified: the use of '( and that of '<' and finally
	   whether an @ begins a SE8 style type annotation or a SE5 declaration annotation. Where they can co-exist,
	   we treat the type annotation as a declarative annotation.
	*/
	boolean atConflictScenario(int token);

	/* Return true if at the configuration the parser finds itself in, it would shift the token.
	   It is axiomatic of the push down automaton that corresponds to the LALR grammar that it
	   will never shift on invalid input.
	*/
	boolean automatonWillShift(int token);

	/*
	 * Return true if the parser is parsing a module declaration. In Java 9, module, requires, exports,
	 * to, uses, provides, and with are restricted keywords (i.e. they are keywords solely where they
	 * appear as terminals in ModuleDeclaration, and are identifiers everywhere else)
	 */
	boolean isParsingModuleDeclaration();
	boolean isParsingJava14();
}