//
// Intermediate code used for interpretation
//
#ifndef ICODE_H
#define ICODE_H

#include <list>
#include <string>
//... #include "nt.h"         // Name table
//... #include "lt.h"         // Label table

using std::list;
using std::string;

class Label;
class NameDef;

class ICommand {
public:
    enum {
        int_const = 0,
        double_const,   // 1
        string_const,   // 2
        assign,         // 3 assign local or global variable
        assign_local,   // 4 assign local variable
        assign_ref,     // 5 assign local variable as a reference
        ret,            // 6
        name,           // 7
        def_global,     // 8 Variable definition
        empty_array,    // 9 Array definition
        array_append,   // 10
        array_element,  // 11 Array element
        function_def,   // 12
        function_call,  // 13
        function_entry, // 14
        function_exit,  // 15
        plus,           // 16
        minus,          // 17
        mul,            // 18
        div,            // 19
        mod,            // 20
        uminus,         // 21
        cmp,            // 22
        go_to,          // 23
        if_goto,        // 24 Conditional goto
        eq, ne, gt, ge, lt, le, // 25-30 conditions
        if_throw,       // 31 Conditional exception
        input,          // 32
        output,         // 33
        typecast,       // 34
        pop,            // 35
        exch,           // 36
        power,          // 37
        nop,            // 38 No operation
    };

    int label;          // Label of this command
    const Label* label_ptr; // Pointer to label table
    int type;           // Type of command
    int ext;            // Additional information (base type, 
                        //     condition for if_goto, etc.)
    int goto_label;     // Label for goto
    const Label* goto_label_ptr; // Pointer to label table
    int int_value;      // Used for constants, but may contain
                        //     an additional information
    double double_value;
    string string_value;

    int line_number;    // 1-based line number in the source program
                        //         or 0 in line is undefined

    ICommand():
        label(0),
        label_ptr(0),
        type(0),
        ext(0),
        goto_label(0),
        goto_label_ptr(0),
        int_value(0),
        double_value(0),
        string_value(),
        line_number(0)
    {}

    void print() const;
};

class IProgram: public list<ICommand> {
public:
    IProgram::iterator addNewCommand();
    void print() const;
};

#endif