d4be9a13c8
Add type-checking support for default methods as per Featherweight-Defender document Reviewed-by: jjg, dlsmith
101 lines
3.1 KiB
Java
101 lines
3.1 KiB
Java
/*
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* Copyright (c) 2012, 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 shapegen;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.io.IOException;
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import java.io.StringReader;
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import static java.lang.Character.isLetter;
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import static java.lang.Character.isUpperCase;
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import static java.lang.Character.isWhitespace;
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/**
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* Parse a type template definition string
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*
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* input :: classDef
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* classDef :: letter [ ( classDef* ) ]
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*
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* @author Robert Field
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*/
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public class TTParser extends StringReader {
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private Map<Character, TTNode> letterMap = new HashMap<>();
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private char ch;
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private final String def;
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public TTParser(String s) {
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super(s);
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this.def = s;
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}
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private void advance() throws IOException {
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do {
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ch = (char)read();
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} while (isWhitespace(ch));
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}
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public TTNode parse() {
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try {
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advance();
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return classDef();
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} catch (IOException t) {
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throw new RuntimeException(t);
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}
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}
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private TTNode classDef() throws IOException {
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if (!isLetter(ch)) {
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if (ch == (char)-1) {
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throw new IOException("Unexpected end of type template in " + def);
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} else {
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throw new IOException("Unexpected character in type template: " + (Character)ch + " in " + def);
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}
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}
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char nodeCh = ch;
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TTNode node = letterMap.get(nodeCh);
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boolean canBeClass = isUpperCase(nodeCh);
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advance();
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if (node == null) {
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List<TTNode> subtypes = new ArrayList<>();
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if (ch == '(') {
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advance();
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while (ch != ')') {
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subtypes.add(classDef());
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}
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advance();
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}
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node = new TTNode(subtypes, canBeClass);
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letterMap.put(nodeCh, node);
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}
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return node;
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}
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}
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