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/* MfracParser.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.mathml;
import java.util.List;
import org.jdom.Element;
import be.ugent.caagt.jmathtex.TeXFormula;
import be.ugent.caagt.jmathtex.TeXConstants;
class MfracParser extends PresentationElementParser {
private static final String THICKNESS = "linethickness",
NUM_ALIGN = "numalign", DENOM_ALIGN = "denomalign";
public TeXFormula buildFormula(Element el, Environment env)
throws MathMLException {
List formulas = MathMLParser.getFormulaList(el.getChildren(), env);
if (formulas.size() != 2)
throw new MathMLException("mfrac needs exactly 2 child elements!");
// get element attribute values
String lineThickness = el.getAttributeValue(THICKNESS), numAlign = el
.getAttributeValue(NUM_ALIGN), denomAlign = el
.getAttributeValue(DENOM_ALIGN);
// if attribute values not set, use environment values if set
if (lineThickness == null)
lineThickness = env.get(THICKNESS);
if (numAlign == null)
numAlign = env.get(NUM_ALIGN);
if (denomAlign == null)
denomAlign = env.get(DENOM_ALIGN);
// get unit and linethickness value
float thickness = 1;
boolean def = true;
int unit = TeXConstants.UNIT_PIXEL;
if (lineThickness != null) {
lineThickness = lineThickness.trim();
// ignore predefined linethickness values
if (!"thin".equals(lineThickness) && !"thick".equals(lineThickness)
&& !"medium".equals(lineThickness)) {
// unit doesn't have to be specified (see MathML-specification)
NumberUnit nu = new NumberUnit(lineThickness, false);
thickness = nu.getNumber();
unit = nu.getUnit();
if (unit != NumberUnit.NO_UNIT)
def = false;
}
}
if (def) // no unit -> use default thickness
return ((TeXFormula) formulas.get(0)).fraction((TeXFormula) formulas
.get(1), thickness, getAlignment(numAlign),
getAlignment(denomAlign));
else
return ((TeXFormula) formulas.get(0)).fraction((TeXFormula) formulas
.get(1), unit, thickness, getAlignment(numAlign),
getAlignment(denomAlign));
}
private static int getAlignment(String align) throws MathMLException {
if (align == null)
// default
return TeXConstants.ALIGN_CENTER;
else {
if ("left".equals(align))
return TeXConstants.ALIGN_LEFT;
else if ("center".equals(align))
return TeXConstants.ALIGN_CENTER;
else if ("right".equals(align))
return TeXConstants.ALIGN_RIGHT;
else
throw new MathMLException("Invalid alignment argument : '" + align
+ "'!");
}
}
}
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