logprim.cpp

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#include "xtended.hh"
#include "Text.hh"
#include <math.h>

#include "floats.hh"

class LogPrim : public xtended
{

 public:
 
    LogPrim() : xtended("log") {}
    
    virtual unsigned int arity () { return 1; }
    
    virtual bool    needCache ()    { return true; }
    
    virtual Type    infereSigType (const vector<Type>& args)
    {
        assert (args.size() == arity());
        interval i = args[0]->getInterval();
        if (i.valid & i.lo>0) {
            return castInterval(floatCast(args[0]), interval(log(i.lo), log(i.hi)));
        } else {
            return floatCast(args[0]);
        }
    }
    
    virtual void    sigVisit (Tree sig, sigvisitor* visitor) {} 
    
    virtual int infereSigOrder (const vector<int>& args) {
        assert (args.size() == arity());
        return args[0];
    }

    
    virtual Tree    computeSigOutput (const vector<Tree>& args) {
        num n;
        assert (args.size() == arity());
        if (isNum(args[0],n)) {
            return tree(log(double(n)));
        } else {
            return tree(symbol(), args[0]);
        }
    }
        
    virtual string  generateCode (Klass* klass, const vector<string>& args, const vector<Type>& types)
    {
        assert (args.size() == arity());
        assert (types.size() == arity());
        
        return subst("log$1($0)", args[0], isuffix());
    }
    
    virtual string  generateLateq (Lateq* lateq, const vector<string>& args, const vector<Type>& types)
    {
        assert (args.size() == arity());
        assert (types.size() == arity());
        
        return subst("\\ln\\left( $0 \\right)", args[0]);
    }
    
};


xtended* gLogPrim = new LogPrim();