/** factors (without ^ or % ) */
private ParseNode parseSimpleFactor() {
SkipWhite();
switch (look) {
case '#':
return new ParseNode(ErrPtg.valueOf(parseErrorLiteral()));
case '-':
Match('-');
return new ParseNode(UnaryMinusPtg.instance, powerFactor());
case '+':
Match('+');
return new ParseNode(UnaryPlusPtg.instance, powerFactor());
case '(':
Match('(');
ParseNode inside = comparisonExpression();
Match(')');
return new ParseNode(ParenthesisPtg.instance, inside);
case '"':
return new ParseNode(new StringPtg(parseStringLiteral()));
case '{':
Match('{');
ParseNode arrayNode = parseArray();
Match('}');
return arrayNode;
}
if (IsAlpha(look) || Character.isDigit(look) || look == '\'' || look == '[') {
return parseRangeExpression();
}
if (look == '.') {
return new ParseNode(parseNumber());
}
throw expected("cell ref or constant literal");
}
