string.h

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#if !defined(ULTRA_STRING_PRIMITIVE_H)
#define      ULTRA_STRING_PRIMITIVE_H
 
#include <cstdlib>
#include <string>
 
#include "kernel/terminal.h"
#include "kernel/gp/function.h"
 
namespace ultra::str
{
 
class literal : public terminal
{
public:
  explicit literal(const std::string &s,
                   category_t c = symbol::default_category)
    : terminal(s, c)
  {
    Expects(!s.empty());
  }
 
  [[nodiscard]] value_t instance() const final
  {
    return name();
  }
};

class ife : public function
{
public:
  explicit ife(return_type r, const param_data_types &pt)
    : function("SIFE", r, pt)
  {
    Expects(pt.size() == 4);
    Expects(r == pt[2]);
    Expects(pt[0] == pt[1]);
    Expects(pt[2] == pt[3]);
  }
 
  [[nodiscard]] std::string to_string(format f) const final
  {
    switch (f)
    {
    case python_format:  return "({2} if {0} == {1} else {3})";
    default:             return "({0}=={1} ? {2} : {3})";
    }
  }
 
  [[nodiscard]] value_t eval(const params &pars) const final
  {
    const auto v0(pars[0]);
    if (!has_value(v0))  return v0;
 
    const auto v1(pars[1]);
    if (!has_value(v1))  return v1;
 
    return v0 == v1 ? pars[2] : pars[3];
  }
};
 
}  // namespace ultra::str
 
#endif  // include guard