string.h

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#if !defined(VITA_STRING_PRIMITIVE_H)
#define      VITA_STRING_PRIMITIVE_H
 
#include <algorithm>
#include <cstdlib>
#include <string>
 
#include "kernel/gp/function.h"
#include "kernel/gp/mep/interpreter.h"
#include "kernel/gp/terminal.h"
#include "kernel/random.h"
 
namespace vita::str
{
 
class ife : public function
{
public:
  explicit ife(const cvect &c)
    : function("SIFE", c[1], {c[0], c[0], c[1], c[1]})
  { Expects(c.size() == 2); }
 
  std::string display(format f) const final
  {
    switch (f)
    {
    case c_format:
    case cpp_format:
    case mql_format:     return "(%%1%% == %%2%% ? %%3%% : %%4%%)";
    case python_format:  return "(%%3%% if %%1%% == %%2%% else %%4%%)";
    default:             return function::display();
    }
  }
 
  value_t eval(symbol_params &args) const final
  {
    const auto v0(args[0]);
    if (!has_value(v0))  return v0;
 
    const auto v1(args[1]);
    if (!has_value(v1))  return v1;
 
    if (v0 == v1)
      return args[2];
 
    return args[3];
  }
};
 
}  // namespace vita::str
 
#endif  // include guard