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383 lines
12 KiB
Java
383 lines
12 KiB
Java
/*
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* Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.lang.model;
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import java.util.Collections;
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import java.util.Set;
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import java.util.HashSet;
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/**
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* Source versions of the Java™ programming language.
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*
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* See the appropriate edition of
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* <cite>The Java™ Language Specification</cite>
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* for information about a particular source version.
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*
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* <p>Note that additional source version constants will be added to
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* model future releases of the language.
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*
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* @author Joseph D. Darcy
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* @author Scott Seligman
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* @author Peter von der Ahé
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* @since 1.6
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*/
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public enum SourceVersion {
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/*
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* Summary of language evolution
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* 1.1: nested classes
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* 1.2: strictfp
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* 1.3: no changes
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* 1.4: assert
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* 1.5: annotations, generics, autoboxing, var-args...
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* 1.6: no changes
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* 1.7: diamond syntax, try-with-resources, etc.
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* 1.8: lambda expressions and default methods
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* 9: modules, small cleanups to 1.7 and 1.8 changes
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* 10: to-be-determined changes
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*/
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/**
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* The original version.
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*
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* The language described in
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* <cite>The Java™ Language Specification, First Edition</cite>.
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*/
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RELEASE_0,
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/**
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* The version recognized by the Java Platform 1.1.
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*
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* The language is {@code RELEASE_0} augmented with nested classes as described in the 1.1 update to
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* <cite>The Java™ Language Specification, First Edition</cite>.
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*/
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RELEASE_1,
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/**
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* The version recognized by the Java 2 Platform, Standard Edition,
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* v 1.2.
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*
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* The language described in
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* <cite>The Java™ Language Specification,
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* Second Edition</cite>, which includes the {@code
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* strictfp} modifier.
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*/
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RELEASE_2,
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/**
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* The version recognized by the Java 2 Platform, Standard Edition,
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* v 1.3.
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*
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* No major changes from {@code RELEASE_2}.
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*/
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RELEASE_3,
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/**
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* The version recognized by the Java 2 Platform, Standard Edition,
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* v 1.4.
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*
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* Added a simple assertion facility.
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*/
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RELEASE_4,
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/**
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* The version recognized by the Java 2 Platform, Standard
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* Edition 5.0.
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*
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* The language described in
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* <cite>The Java™ Language Specification,
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* Third Edition</cite>. First release to support
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* generics, annotations, autoboxing, var-args, enhanced {@code
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* for} loop, and hexadecimal floating-point literals.
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*/
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RELEASE_5,
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/**
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* The version recognized by the Java Platform, Standard Edition
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* 6.
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*
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* No major changes from {@code RELEASE_5}.
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*/
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RELEASE_6,
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/**
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* The version recognized by the Java Platform, Standard Edition
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* 7.
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*
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* Additions in this release include, diamond syntax for
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* constructors, {@code try}-with-resources, strings in switch,
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* binary literals, and multi-catch.
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* @since 1.7
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*/
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RELEASE_7,
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/**
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* The version recognized by the Java Platform, Standard Edition
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* 8.
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*
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* Additions in this release include lambda expressions and default methods.
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* @since 1.8
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*/
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RELEASE_8,
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/**
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* The version recognized by the Java Platform, Standard Edition
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* 9.
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*
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* Additions in this release include modules and removal of a
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* single underscore from the set of legal identifier names.
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*
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* @since 9
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*/
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RELEASE_9,
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/**
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* The version recognized by the Java Platform, Standard Edition
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* 10.
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*
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* @since 10
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*/
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RELEASE_10;
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// Note that when adding constants for newer releases, the
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// behavior of latest() and latestSupported() must be updated too.
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/**
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* Returns the latest source version that can be modeled.
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*
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* @return the latest source version that can be modeled
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*/
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public static SourceVersion latest() {
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return RELEASE_10;
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}
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private static final SourceVersion latestSupported = getLatestSupported();
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private static SourceVersion getLatestSupported() {
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try {
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String specVersion = System.getProperty("java.specification.version");
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switch (specVersion) {
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case "10":
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return RELEASE_10;
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case "9":
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case "1.9":
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return RELEASE_9;
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case "1.8":
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return RELEASE_8;
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case "1.7":
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return RELEASE_7;
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case "1.6":
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return RELEASE_6;
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}
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} catch (SecurityException se) {}
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return RELEASE_5;
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}
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/**
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* Returns the latest source version fully supported by the
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* current execution environment. {@code RELEASE_5} or later must
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* be returned.
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*
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* @return the latest source version that is fully supported
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*/
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public static SourceVersion latestSupported() {
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return latestSupported;
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}
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/**
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* Returns whether or not {@code name} is a syntactically valid
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* identifier (simple name) or keyword in the latest source
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* version. The method returns {@code true} if the name consists
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* of an initial character for which {@link
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* Character#isJavaIdentifierStart(int)} returns {@code true},
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* followed only by characters for which {@link
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* Character#isJavaIdentifierPart(int)} returns {@code true}.
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* This pattern matches regular identifiers, keywords, restricted
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* keywords, and the literals {@code "true"}, {@code "false"}, and
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* {@code "null"}.
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* The method returns {@code false} for all other strings.
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*
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* @param name the string to check
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* @return {@code true} if this string is a
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* syntactically valid identifier or keyword, {@code false}
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* otherwise.
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*/
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public static boolean isIdentifier(CharSequence name) {
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String id = name.toString();
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if (id.length() == 0) {
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return false;
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}
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int cp = id.codePointAt(0);
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if (!Character.isJavaIdentifierStart(cp)) {
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return false;
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}
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for (int i = Character.charCount(cp);
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i < id.length();
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i += Character.charCount(cp)) {
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cp = id.codePointAt(i);
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if (!Character.isJavaIdentifierPart(cp)) {
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return false;
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}
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}
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return true;
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}
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/**
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* Returns whether or not {@code name} is a syntactically valid
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* qualified name in the latest source version. Unlike {@link
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* #isIdentifier isIdentifier}, this method returns {@code false}
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* for keywords, boolean literals, and the null literal.
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* This method returns {@code true} for <i>restricted
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* keywords</i>.
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*
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* @param name the string to check
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* @return {@code true} if this string is a
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* syntactically valid name, {@code false} otherwise.
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* @jls 3.9 Keywords
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* @jls 6.2 Names and Identifiers
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*/
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public static boolean isName(CharSequence name) {
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return isName(name, latest());
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}
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/**
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* Returns whether or not {@code name} is a syntactically valid
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* qualified name in the given source version. Unlike {@link
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* #isIdentifier isIdentifier}, this method returns {@code false}
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* for keywords, boolean literals, and the null literal.
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* This method returns {@code true} for <i>restricted
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* keywords</i>.
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*
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* @param name the string to check
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* @param version the version to use
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* @return {@code true} if this string is a
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* syntactically valid name, {@code false} otherwise.
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* @jls 3.9 Keywords
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* @jls 6.2 Names and Identifiers
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* @since 9
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*/
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public static boolean isName(CharSequence name, SourceVersion version) {
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String id = name.toString();
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for(String s : id.split("\\.", -1)) {
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if (!isIdentifier(s) || isKeyword(s, version))
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return false;
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}
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return true;
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}
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/**
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* Returns whether or not {@code s} is a keyword, boolean literal,
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* or null literal in the latest source version.
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* This method returns {@code false} for <i>restricted
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* keywords</i>.
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*
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* @param s the string to check
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* @return {@code true} if {@code s} is a keyword, or boolean
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* literal, or null literal, {@code false} otherwise.
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* @jls 3.9 Keywords
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* @jls 3.10.3 Boolean Literals
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* @jls 3.10.7 The Null Literal
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*/
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public static boolean isKeyword(CharSequence s) {
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return isKeyword(s, latest());
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}
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/**
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* Returns whether or not {@code s} is a keyword, boolean literal,
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* or null literal in the given source version.
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* This method returns {@code false} for <i>restricted
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* keywords</i>.
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*
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* @param s the string to check
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* @param version the version to use
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* @return {@code true} if {@code s} is a keyword, or boolean
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* literal, or null literal, {@code false} otherwise.
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* @jls 3.9 Keywords
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* @jls 3.10.3 Boolean Literals
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* @jls 3.10.7 The Null Literal
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* @since 9
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*/
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public static boolean isKeyword(CharSequence s, SourceVersion version) {
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String id = s.toString();
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switch(id) {
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// A trip through history
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case "strictfp":
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return version.compareTo(RELEASE_2) >= 0;
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case "assert":
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return version.compareTo(RELEASE_4) >= 0;
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case "enum":
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return version.compareTo(RELEASE_5) >= 0;
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case "_":
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return version.compareTo(RELEASE_9) >= 0;
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// Keywords common across versions
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// Modifiers
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case "public": case "protected": case "private":
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case "abstract": case "static": case "final":
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case "transient": case "volatile": case "synchronized":
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case "native":
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// Declarations
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case "class": case "interface": case "extends":
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case "package": case "throws": case "implements":
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// Primitive types and void
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case "boolean": case "byte": case "char":
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case "short": case "int": case "long":
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case "float": case "double":
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case "void":
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// Control flow
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case "if": case "else":
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case "try": case "catch": case "finally":
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case "do": case "while":
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case "for": case "continue":
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case "switch": case "case": case "default":
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case "break": case "throw": case "return":
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// Other keywords
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case "this": case "new": case "super":
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case "import": case "instanceof":
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// Forbidden!
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case "goto": case "const":
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// literals
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case "null": case "true": case "false":
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return true;
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default:
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return false;
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}
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}
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}
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