| /* |
| * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package org.openjdk.tests.shapegen; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.io.IOException; |
| import java.io.StringReader; |
| |
| import static java.lang.Character.isLetter; |
| import static java.lang.Character.isUpperCase; |
| import static java.lang.Character.isWhitespace; |
| |
| /** |
| * Parse a type template definition string |
| * |
| * input :: classDef |
| * classDef :: letter [ ( classDef* ) ] |
| * |
| * @author Robert Field |
| */ |
| public class TTParser extends StringReader { |
| |
| private Map<Character, TTNode> letterMap = new HashMap<>(); |
| private char ch; |
| |
| private final String def; |
| |
| public TTParser(String s) { |
| super(s); |
| this.def = s; |
| } |
| |
| private void advance() throws IOException { |
| do { |
| ch = (char)read(); |
| } while (isWhitespace(ch)); |
| } |
| |
| public TTNode parse() { |
| try { |
| advance(); |
| return classDef(); |
| } catch (IOException t) { |
| throw new RuntimeException(t); |
| } |
| } |
| |
| private TTNode classDef() throws IOException { |
| if (!isLetter(ch)) { |
| if (ch == (char)-1) { |
| throw new IOException("Unexpected end of type template in " + def); |
| } else { |
| throw new IOException("Unexpected character in type template: " + (Character)ch + " in " + def); |
| } |
| } |
| char nodeCh = ch; |
| TTNode node = letterMap.get(nodeCh); |
| boolean canBeClass = isUpperCase(nodeCh); |
| advance(); |
| if (node == null) { |
| List<TTNode> subtypes = new ArrayList<>(); |
| if (ch == '(') { |
| advance(); |
| while (ch != ')') { |
| subtypes.add(classDef()); |
| } |
| advance(); |
| } |
| node = new TTNode(subtypes, canBeClass); |
| letterMap.put(nodeCh, node); |
| } |
| return node; |
| } |
| } |