private ExpressionNode parseTerm() throws ParseExpressionException {
ExpressionNode rootNode = null;
scanner.nextSymbol();
while (scanner.isNot()) {
ExpressionNode oldRoot = rootNode;
rootNode = new ExpressionNotNode(oldRoot);
scanner.nextSymbol();
}
if (scanner.isMiIdentifier()) {
if (rootNode != null) {
ExpressionNotNode tmpNode = (ExpressionNotNode) rootNode;
while (tmpNode.getChild() != null) {
tmpNode = (ExpressionNotNode) tmpNode.getChild();
}
tmpNode.setChild(new ExpressionMiNode(scanner.getCurrSymbol()));
} else {
rootNode = new ExpressionMiNode(scanner.getCurrSymbol());
}
} else if (scanner.isFreeText()) {
if (rootNode != null) {
ExpressionNotNode tmpNode = (ExpressionNotNode) rootNode;
while (tmpNode.getChild() != null) {
tmpNode = (ExpressionNotNode) tmpNode.getChild();
}
tmpNode.setChild(parseFreeText());
} else {
rootNode = parseFreeText();
}
} else if (scanner.isLeftPar()) {
if (rootNode != null) {
ExpressionNotNode tmpNode = (ExpressionNotNode) rootNode;
while (tmpNode.getChild() != null) {
tmpNode = (ExpressionNotNode) tmpNode.getChild();
}
tmpNode.setChild(parseExpression());
} else {
rootNode = parseExpression();
}
scanner.nextSymbol();
if (!scanner.isRightPar()) {
throw new ParseExpressionException();
}
} else {
throw new ParseExpressionException();
}
return rootNode;
}
