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/* Dummy.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;
/**
* Used by RowAtom. The "textSymbol"-property and the type of an atom can change
* (according to the TeX-algorithms used). Or this atom can be replaced by a ligature,
* (if it was a CharAtom). But atoms cannot be changed, otherwise
* different boxes could be made from the same TeXFormula, and that is not desired!
* This "dummy atom" makes sure that changes to an atom (during the createBox-method of
* a RowAtom) will be reset.
*/
class Dummy {
private Atom el;
private boolean textSymbol = false;
private int type = -1;
/**
* Creates a new Dummy for the given atom.
*
* @param a an atom
*/
public Dummy(Atom a) {
el = a;
}
/**
* Changes the type of the atom
*
* @param t the new type
*/
public void setType(int t) {
type = t;
}
/**
*
* @return the changed type, or the old left type if it hasn't been changed
*/
public int getLeftType() {
return (type >= 0 ? type : el.getLeftType());
}
/**
*
* @return the changed type, or the old right type if it hasn't been changed
*/
public int getRightType() {
return (type >= 0 ? type : el.getRightType());
}
public boolean isCharSymbol() {
return el instanceof CharSymbol;
}
/*
* This method will only be called if isCharSymbol returns true.
*/
public CharFont getCharFont(TeXFont tf) {
return ((CharSymbol) el).getCharFont(tf);
}
/**
* Changes this atom into the given "ligature atom".
*
* @param a the ligature atom
*/
public void changeAtom(FixedCharAtom a) {
textSymbol = false;
type = -1;
el = a;
}
public Box createBox(TeXEnvironment rs) {
if (textSymbol)
((CharSymbol) el).markAsTextSymbol();
Box b = el.createBox(rs);
if (textSymbol)
((CharSymbol) el).removeMark(); // atom remains unchanged!
return b;
}
public void markAsTextSymbol() {
textSymbol = true;
}
public boolean isKern() {
return el instanceof SpaceAtom;
}
// only for Row-elements
public void setPreviousAtom(Dummy prev) {
if (el instanceof Row)
((Row) el).setPreviousAtom(prev);
}
}
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