/**
* parse the text. When the text is parsed the width, height, leading are all calculated. The text
* will only be truly parsed if the graphics context has changed or the text has changed or the
* font has changed. Otherwise nothing is done when this method is called.
*
* @param g Graphics context.
*/
public void parseText(Graphics g) {
FontMetrics fm;
TextState current = new TextState();
char ch;
Stack state = new Stack();
int w = 0;
if (lg != g) parse = true;
lg = g;
if (!parse) return;
parse = false;
width = 0;
leading = 0;
ascent = 0;
descent = 0;
height = 0;
maxAscent = 0;
maxDescent = 0;
if (text == null || g == null) return;
list.removeAllElements();
if (font == null) current.f = g.getFont();
else current.f = font;
state.push(current);
list.addElement(current);
fm = g.getFontMetrics(current.f);
for (int i = 0; i < text.length(); i++) {
ch = text.charAt(i);
switch (ch) {
case '$':
i++;
if (i < text.length()) current.s.append(text.charAt(i));
break;
/*
** Push the current state onto the state stack
** and start a new storage string
*/
case '{':
w = current.getWidth(g);
if (!current.isEmpty()) {
current = current.copyState();
list.addElement(current);
}
state.push(current);
current.x += w;
break;
/*
** Pop the state off the state stack and set the current
** state to the top of the state stack
*/
case '}':
w = current.x + current.getWidth(g);
state.pop();
current = ((TextState) state.peek()).copyState();
list.addElement(current);
current.x = w;
break;
case '^':
w = current.getWidth(g);
if (!current.isEmpty()) {
current = current.copyState();
list.addElement(current);
}
current.f = getScriptFont(current.f);
current.x += w;
current.y -= (int) ((double) (current.getAscent(g)) * sup_offset + 0.5);
break;
case '_':
w = current.getWidth(g);
if (!current.isEmpty()) {
current = current.copyState();
list.addElement(current);
}
current.f = getScriptFont(current.f);
current.x += w;
current.y += (int) ((double) (current.getDescent(g)) * sub_offset + 0.5);
break;
default:
current.s.append(ch);
break;
}
}
for (int i = 0; i < list.size(); i++) {
current = ((TextState) (list.elementAt(i)));
if (!current.isEmpty()) {
width += current.getWidth(g);
ascent = Math.max(ascent, Math.abs(current.y) + current.getAscent(g));
descent = Math.max(descent, Math.abs(current.y) + current.getDescent(g));
leading = Math.max(leading, current.getLeading(g));
maxDescent = Math.max(maxDescent, Math.abs(current.y) + current.getMaxDescent(g));
maxAscent = Math.max(maxAscent, Math.abs(current.y) + current.getMaxAscent(g));
}
}
height = ascent + descent + leading;
return;
}
