Function.h

#ifndef FUNCTION_H
#define FUNCTION_H

#include "Record.h"
#include "ParseTree.h"

#define MAX_DEPTH 100


enum ArithOp {
    PushInt, PushDouble, ToDouble, ToDouble2Down,
    IntUnaryMinus, IntMinus, IntPlus, IntDivide, IntMultiply,
    DblUnaryMinus, DblMinus, DblPlus, DblDivide, DblMultiply
};

struct Arithmatic {

    ArithOp myOp;
    int recInput;
    void *litInput;
};

class Function {

private:

    Arithmatic *opList;
    int numOps;

    int returnsInt;

public:

    Function();

    // this grows the specified function from a parse tree and converts
    // it into an accumulator-based computation over the attributes in
    // a record with the given schema; the record "literal" is produced
    // by the GrowFromParseTree method
    void GrowFromParseTree(struct FuncOperator *parseTree, Schema &mySchema);

    // helper function
    Type RecursivelyBuild(struct FuncOperator *parseTree, Schema &mySchema);

    // prints out the function to the screen
    void Print(Schema *schema);

    // applies the function to the given record and returns the result
    Type Apply(Record &toMe, int &intResult, double &doubleResult);
};

#endif