The Annoyance Filter.pdf - Fourmilab

§87 ANNOYANCE-FILTER INTERPRETERS 75
87. Interpreters.
88. Interpreter parent class.
This is the abstract parent class of all concrete interpreters. We provide the services common to most
decoders, while permitting them to be overridden by derived classes.
〈 Class definitions 10 〉 +≡
class MBCSinterpreter {
protected:
const string ∗src;
MBCSdecoder ∗dp;
string prefix , suffix ;
public:
virtual ∼MBCSinterpreter( )
{ }
virtual string name (void) = 0; /∗ Name of decoder ∗/
virtual void setDecoder (MBCSdecoder &d)
{
dp = &d;
}
virtual void setSource (const string &s)
{ /∗ Set input source line ∗/
assert(dp ≠ Λ);
dp ⃗ setSource (s);
}
virtual void setPrefixSuffix (string pre = "", string suf = "")
{
prefix = pre ;
suffix = suf ;
}
virtual string getNextDecodedChar (void);
virtual string decodeLine (const string &s);
};