refined_string_type.h

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/********************************************************************\
 
Module: Type for string expressions used by the string solver.
        These string expressions contain a field `length`, of type
        `index_type`, a field `content` of type `content_type`.
        This module also defines functions to recognise the C and java
        string types.
 
Author: Romain Brenguier, romain.brenguier@diffblue.com
 
\*******************************************************************/
 
 
#ifndef CPROVER_UTIL_REFINED_STRING_TYPE_H
#define CPROVER_UTIL_REFINED_STRING_TYPE_H
 
#include "cprover_prefix.h"
#include "pointer_expr.h"
 
// Internal type used for string refinement
class refined_string_typet: public struct_typet
{
public:
  refined_string_typet(
    const typet &index_type,
    const pointer_typet &content_type);
 
  // Type for the content (list of characters) of a string
  const array_typet &get_content_type() const
  {
    PRECONDITION(components().size()==2);
    return to_array_type(components()[1].type());
  }
 
  const typet &get_char_type() const
  {
    return get_content_type().element_type();
  }
 
  const typet &get_index_type() const
  {
    PRECONDITION(components().size()==2);
    return components()[0].type();
  }
};
 
inline bool is_refined_string_type(const typet &type)
{
    return
      type.id()==ID_struct &&
      to_struct_type(type).get_tag()==CPROVER_PREFIX"refined_string_type";
}
 
extern inline const refined_string_typet &to_refined_string_type(
  const typet &type)
{
  PRECONDITION(is_refined_string_type(type));
  return static_cast<const refined_string_typet &>(type);
}
 
#endif