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/* TeXSymbolParser.java
* =========================================================================
* This file is part of the JMathTeX Library - http://jmathtex.sourceforge.net
*
* Copyright (C) 2004-2007 Universiteit Gent
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program 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 for more details.
*
* A copy of the GNU General Public License can be found in the file
* LICENSE.txt provided with the source distribution of this program (see
* the META-INF directory in the source jar). This license can also be
* found on the GNU website at http://www.gnu.org/licenses/gpl.html.
*
* If you did not receive a copy of the GNU General Public License along
* with this program, contact the lead developer, or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*/
package be.ugent.caagt.jmathtex;
import java.util.HashMap;
import java.util.Map;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;
/**
* Parses TeX symbol definitions from an XML-file.
*/
class TeXSymbolParser {
private static final String RESOURCE_DIR = "";
public static final String RESOURCE_NAME = "TeXSymbols.xml",
DELIMITER_ATTR = "del", TYPE_ATTR = "type";
private static Map<String,Integer> typeMappings = new HashMap<String,Integer>();
private Element root;
public TeXSymbolParser() throws ResourceParseException {
try {
root = new SAXBuilder().build(
getClass().getResourceAsStream(RESOURCE_DIR + RESOURCE_NAME))
.getRootElement();
// set possible valid symbol type mappings
setTypeMappings();
} catch (Exception e) { // JDOMException or IOException
throw new XMLResourceParseException(RESOURCE_NAME, e);
}
}
public Map<String,SymbolAtom> readSymbols() throws ResourceParseException {
Map<String,SymbolAtom> res = new HashMap<String,SymbolAtom>();
// iterate all "symbol"-elements
for (Object obj : root.getChildren("Symbol")) {
Element symbol = (Element) obj;
// retrieve and check required attributes
String name = getAttrValueAndCheckIfNotNull("name", symbol), type = getAttrValueAndCheckIfNotNull(
TYPE_ATTR, symbol);
// retrieve optional attribute
String del = symbol.getAttributeValue(DELIMITER_ATTR);
boolean isDelimiter = (del != null && del.equals("true"));
// check if type is known
Object typeVal = typeMappings.get(type);
if (typeVal == null) // unknown type
throw new XMLResourceParseException(RESOURCE_NAME, "Symbol",
"type", "has an unknown value '" + type + "'!");
// add symbol to the hash table
res.put(name, new SymbolAtom(name, ((Integer) typeVal).intValue(),
isDelimiter));
}
return res;
}
private void setTypeMappings() {
typeMappings.put("ord", TeXConstants.TYPE_ORDINARY);
typeMappings.put("op", TeXConstants.TYPE_BIG_OPERATOR);
typeMappings.put("bin", TeXConstants.TYPE_BINARY_OPERATOR);
typeMappings.put("rel", TeXConstants.TYPE_RELATION);
typeMappings.put("open", TeXConstants.TYPE_OPENING);
typeMappings.put("close", TeXConstants.TYPE_CLOSING);
typeMappings.put("punct", TeXConstants.TYPE_PUNCTUATION);
typeMappings.put("acc", TeXConstants.TYPE_ACCENT);
}
private static String getAttrValueAndCheckIfNotNull(String attrName,
Element element) throws ResourceParseException {
String attrValue = element.getAttributeValue(attrName);
if (attrValue == null)
throw new XMLResourceParseException(RESOURCE_NAME, element.getName(),
attrName, null);
return attrValue;
}
}
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