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/* GlueSettingsParser.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.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
/**
* Parses the glue settings (different types and rules) from an XML-file.
*/
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 Element root;
public GlueSettingsParser() throws ResourceParseException {
try {
setTypeMappings();
setStyleMappings();
root = new SAXBuilder().build(
GlueSettingsParser.class.getResourceAsStream(RESOURCE_NAME))
.getRootElement();
parseGlueTypes();
} catch (IOException e) { // JDOMException or IOException
throw new XMLResourceParseException(RESOURCE_NAME, e);
} catch (JDOMException 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> ();
Element types = root.getChild("GlueTypes");
int defaultIndex = -1;
int index = 0;
if (types != null) { // element present
for (Object obj : types.getChildren("GlueType")) {
Element type = (Element) obj;
// 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(Element 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.getAttributeValue(names[i]);
if (attrVal != null) // 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()];
Element glueTable = root.getChild("GlueTable");
if (glueTable != null) { // element present
// iterate all the "Glue"-elements
for (Object obj : glueTable.getChildren("Glue")) {
Element glue = (Element) obj;
// retrieve required attribute values and throw exception if they're not set
String left = getAttrValueAndCheckIfNotNull("lefttype", glue), right = getAttrValueAndCheckIfNotNull(
"righttype", glue), type = getAttrValueAndCheckIfNotNull(
"gluetype", glue);
// iterate all the "Style"-elements
for (Object object : glue.getChildren("Style")) {
Element style = (Element) object;
String styleName = getAttrValueAndCheckIfNotNull("name", style);
// retrieve mappings
Object l = (Integer) typeMappings.get(left), r = (Integer) typeMappings
.get(right), st = (Integer) styleMappings.get(styleName), val = (Integer) 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,
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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