atan2prim.cpp

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

#include "floats.hh"

class Atan2Prim : public xtended
{

 public:
 
    Atan2Prim() : xtended("atan2") {}
    
    virtual unsigned int    arity () { return 2; }
    
    virtual bool    needCache ()    { return true; }
    
    virtual Type    infereSigType (const vector<Type>& args)
    {
        assert (args.size() == 2);
        return floatCast(args[0]|args[1]);
    }
    
    virtual void    sigVisit (Tree sig, sigvisitor* visitor) {} 
    
    virtual int infereSigOrder (const vector<int>& args) {
        return max(args[0], args[1]);
    }

    
    virtual Tree    computeSigOutput (const vector<Tree>& args) 
    {
        assert (args.size() == 2);
        num n,m;
        if (isNum(args[0],n) && isNum(args[1],m)) {
            return tree(atan2(double(n), double(m)));
        } else {
            return tree(symbol(), args[0], args[1]);
        }
    }
        
    virtual string  generateCode (Klass* klass, const vector<string>& args, const vector<Type>& types)
    {
        assert (args.size() == arity());
        assert (types.size() == arity());
        
        return subst("atan2$2($0,$1)", args[0], args[1], isuffix());
    }
    
    virtual string  generateLateq (Lateq* lateq, const vector<string>& args, const vector<Type>& types)
    {
        assert (args.size() == arity());
        assert (types.size() == arity());
        
        return subst("\\arctan\\frac{$0}{$1}", args[0], args[1]);
    }
    
};


xtended* gAtan2Prim = new Atan2Prim();