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/*
* 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;
}
}
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