private static Expression Prefix(Lexemes lexemes, IUnitRegistry unitRegistry)
{
IUnit unit;
Prefix prefix;
if (lexemes.AcceptTokenFrom(unitRegistry, out prefix))
{
if (lexemes.AcceptTokenFrom(unitRegistry, out unit))
{
return Unit(prefix, unit);
}
lexemes.MoveToPrevious();
}
if (lexemes.AcceptTokenFrom(unitRegistry, out unit))
{
return Unit(null, unit);
}
string variable;
if (lexemes.AcceptTokenFrom(VariableRegex, out variable))
{
return new VariableExpression(variable);
}
throw CreateParseException(UnitError.PrefixUnitOrUnitOrVariableNotFound, lexemes.Current);
}
private static Expression Prefix(Lexemes lexemes, IUnitRegistry unitRegistry)
{
IUnit unit;
Prefix prefix;
if (lexemes.AcceptTokenFrom(unitRegistry, out prefix))
{
if (lexemes.AcceptTokenFrom(unitRegistry, out unit))
{
return(Unit(prefix, unit));
}
lexemes.MoveToPrevious();
}
if (lexemes.AcceptTokenFrom(unitRegistry, out unit))
{
return(Unit(null, unit));
}
string variable;
if (lexemes.AcceptTokenFrom(VariableRegex, out variable))
{
return(new VariableExpression(variable));
}
throw CreateParseException(UnitError.PrefixUnitOrUnitOrVariableNotFound, lexemes.Current);
}