private Property parsePrimaryExpr()
{
Property prop;
switch (currentToken)
{
case TOK_LPAR:
next();
prop = parseAdditiveExpr();
expectRpar();
return(prop);
case TOK_LITERAL:
prop = new StringProperty(currentTokenValue);
break;
case TOK_NCNAME:
prop = new NCnameProperty(currentTokenValue);
break;
case TOK_FLOAT:
prop = new NumberProperty(ParseDouble(currentTokenValue));
break;
case TOK_INTEGER:
prop = new NumberProperty(Int32.Parse(currentTokenValue));
break;
case TOK_PERCENT:
double pcval = ParseDouble(
currentTokenValue.Substring(0, currentTokenValue.Length - 1)) / 100.0;
IPercentBase pcBase = this.propInfo.GetPercentBase();
if (pcBase != null)
{
if (pcBase.GetDimension() == 0)
{
prop = new NumberProperty(pcval * pcBase.GetBaseValue());
}
else if (pcBase.GetDimension() == 1)
{
prop = new LengthProperty(new PercentLength(pcval,
pcBase));
}
else
{
throw new PropertyException("Illegal percent dimension value");
}
}
else
{
prop = new NumberProperty(pcval);
}
break;
case TOK_NUMERIC:
int numLen = currentTokenValue.Length - currentUnitLength;
string unitPart = currentTokenValue.Substring(numLen);
double numPart = ParseDouble(currentTokenValue.Substring(0, numLen));
Length length = null;
if (unitPart.Equals(RELUNIT))
{
length = new FixedLength(numPart, propInfo.currentFontSize());
}
else
{
length = new FixedLength(numPart, unitPart);
}
if (length == null)
{
throw new PropertyException("unrecognized unit name: " + currentTokenValue);
}
else
{
prop = new LengthProperty(length);
}
break;
case TOK_COLORSPEC:
prop = new ColorTypeProperty(new ColorType(currentTokenValue));
break;
case TOK_FUNCTION_LPAR:
{
IFunction function =
(IFunction)functionTable[currentTokenValue];
if (function == null)
{
throw new PropertyException("no such function: "
+ currentTokenValue);
}
next();
propInfo.pushFunction(function);
prop = function.Eval(parseArgs(function.NumArgs), propInfo);
propInfo.popFunction();
return(prop);
}
default:
throw new PropertyException("syntax error");
}
next();
return(prop);
}
