GlueSettingsParser.java
/* GlueSettingsParser.java
* =========================================================================
* This file is originally part of the JMathTeX Library - http://jmathtex.sourceforge.net
*
* Copyright (C) 2004-2007 Universiteit Gent
* Copyright (C) 2009 DENIZET Calixte
*
* 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.
*
* Linking this library statically or dynamically with other modules
* is making a combined work based on this library. Thus, the terms
* and conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce
* an executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under terms
* of your choice, provided that you also meet, for each linked independent
* module, the terms and conditions of the license of that module.
* An independent module is a module which is not derived from or based
* on this library. If you modify this library, you may extend this exception
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*/
package org.scilab.forge.jlatexmath;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Parses the glue settings (different types and rules) from an XML-file.
*/
public class GlueSettingsParser {
private static final String RESOURCE_NAME = "GlueSettings.xml";
private final Map<String,Integer> typeMappings = new HashMap<String,Integer>();
private final Map<String,Integer> glueTypeMappings = new HashMap<String,Integer>();
private Glue[] glueTypes;
private final Map<String,Integer> styleMappings = new HashMap<String,Integer>();
private XmlElement root;
public GlueSettingsParser() throws ResourceParseException {
try {
setTypeMappings();
setStyleMappings();
root = XmlReader.parse(TeXResources.open(GlueSettingsParser.class, RESOURCE_NAME));
parseGlueTypes();
} catch (Exception e) { // JDOMException or IOException
throw new XMLResourceParseException(RESOURCE_NAME, e);
}
}
private void setStyleMappings() {
styleMappings.put("display", TeXConstants.STYLE_DISPLAY / 2);
styleMappings.put("text", TeXConstants.STYLE_TEXT / 2);
styleMappings.put("script", TeXConstants.STYLE_SCRIPT / 2);
styleMappings.put("script_script", TeXConstants.STYLE_SCRIPT_SCRIPT / 2); // autoboxing
}
private void parseGlueTypes() throws ResourceParseException {
List<Glue> glueTypesList = new ArrayList<Glue> ();
XmlElement types = (XmlElement)root.getElementsByTagName("GlueTypes").item(0);
int defaultIndex = -1;
int index = 0;
if (types != null) { // element present
XmlNodeList list = types.getElementsByTagName("GlueType");
for (int i = 0; i < list.getLength(); i++) {
XmlElement type = (XmlElement)list.item(i);
// retrieve required attribute value, throw exception if not set
String name = getAttrValueAndCheckIfNotNull("name", type);
Glue glue = createGlue(type, name);
if (name.equalsIgnoreCase("default")) // default must have value
defaultIndex = index;
glueTypesList.add(glue);
index ++;
}
}
if (defaultIndex < 0) {
// create a default glue object if missing
defaultIndex = index;
glueTypesList.add(new Glue(0,0,0,"default"));
}
glueTypes = glueTypesList.toArray(new Glue[glueTypesList.size()]);
// make sure default glue is at the front
if (defaultIndex > 0) {
Glue tmp = glueTypes[defaultIndex];
glueTypes[defaultIndex] = glueTypes[0];
glueTypes[0] = tmp;
}
// make reverse map
for (int i = 0; i < glueTypes.length; i++) {
glueTypeMappings.put(glueTypes[i].getName(), i);
}
}
private Glue createGlue(XmlElement type, String name) throws ResourceParseException {
final String[] names = { "space", "stretch", "shrink" };
float[] values = new float[names.length];
for (int i = 0; i < names.length; i++) {
double val = 0; // default value if attribute not present
String attrVal = null;
try {
attrVal = type.getAttribute(names[i]);
if (!attrVal.equals("")) // attribute present
val = Double.parseDouble(attrVal);
} catch (NumberFormatException e) {
throw new XMLResourceParseException(RESOURCE_NAME, "GlueType",
names[i], "has an invalid real value '" + attrVal + "'!");
}
values[i] = (float) val;
}
return new Glue(values[0], values[1], values[2], name);
}
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("inner", TeXConstants.TYPE_INNER); // autoboxing
}
public Glue[] getGlueTypes() {
return glueTypes;
}
public int[][][] createGlueTable() throws ResourceParseException {
int size = typeMappings.size();
int[][][] table = new int[size][size][styleMappings.size()];
XmlElement glueTable = (XmlElement)root.getElementsByTagName("GlueTable").item(0);
if (glueTable != null) { // element present
// iterate all the "Glue"-elements
XmlNodeList list = glueTable.getElementsByTagName("Glue");
for (int i = 0; i < list.getLength(); i++) {
XmlElement glue = (XmlElement)list.item(i);
// retrieve required attribute values and throw exception if they're not set
String left = getAttrValueAndCheckIfNotNull("lefttype", glue);
String right = getAttrValueAndCheckIfNotNull("righttype", glue);
String type = getAttrValueAndCheckIfNotNull("gluetype", glue);
// iterate all the "Style"-elements
XmlNodeList listG = glue.getElementsByTagName("Style");
for (int j = 0; j < listG.getLength(); j++) {
XmlElement style = (XmlElement)listG.item(j);
String styleName = getAttrValueAndCheckIfNotNull("name", style);
// retrieve mappings
Object l = typeMappings.get(left);
Object r = typeMappings.get(right);
Object st = styleMappings.get(styleName);
Object val = glueTypeMappings.get(type);
// throw exception if unknown value set
checkMapping(l, "Glue", "lefttype", left);
checkMapping(r, "Glue", "righttype", right);
checkMapping(val, "Glue", "gluetype", type);
checkMapping(st, "Style", "name", styleName);
// put value in table
table[((Integer) l).intValue()][((Integer) r).intValue()][((Integer) st).intValue()] = ((Integer) val).intValue();
}
}
}
return table;
}
private static void checkMapping(Object val, String elementName,
String attrName, String attrValue) throws ResourceParseException {
if (val == null)
throw new XMLResourceParseException(RESOURCE_NAME, elementName,
attrName, "has an unknown value '" + attrValue + "'!");
}
private static String getAttrValueAndCheckIfNotNull(String attrName,
XmlElement element) throws ResourceParseException {
String attrValue = element.getAttribute(attrName);
if (attrValue.equals(""))
throw new XMLResourceParseException(RESOURCE_NAME, element.getTagName(),
attrName, null);
return attrValue;
}
}