#ifndef SRE_INCLUDED
#define SRE_INCLUDED
#include "third_party/python/Include/object.h"
#include "third_party/python/Include/unicodeobject.h"
#include "third_party/python/Modules/sre_constants.h"

/* size of a code word (must be unsigned short or larger, and
   large enough to hold a UCS4 character) */
#define SRE_CODE Py_UCS4
#if SIZEOF_SIZE_T > 4
#define SRE_MAXREPEAT (~(SRE_CODE)0)
#define SRE_MAXGROUPS ((~(SRE_CODE)0) / 2)
#else
#define SRE_MAXREPEAT ((SRE_CODE)PY_SSIZE_T_MAX)
#define SRE_MAXGROUPS ((SRE_CODE)PY_SSIZE_T_MAX / SIZEOF_SIZE_T / 2)
#endif

typedef struct {
  PyObject_VAR_HEAD Py_ssize_t groups; /* must be first! */
  PyObject* groupindex;
  PyObject* indexgroup;
  /* compatibility */
  PyObject* pattern;     /* pattern source (or None) */
  int flags;             /* flags used when compiling pattern source */
  PyObject* weakreflist; /* List of weak references */
  int isbytes;           /* pattern type (1 - bytes, 0 - string, -1 - None) */
  /* pattern code */
  Py_ssize_t codesize;
  SRE_CODE code[1];
} PatternObject;

#define PatternObject_GetCode(o) (((PatternObject*)(o))->code)

typedef struct {
  PyObject_VAR_HEAD PyObject*
      string;             /* link to the target string (must be first) */
  PyObject* regs;         /* cached list of matching spans */
  PatternObject* pattern; /* link to the regex (pattern) object */
  Py_ssize_t pos, endpos; /* current target slice */
  Py_ssize_t lastindex; /* last index marker seen by the engine (-1 if none) */
  Py_ssize_t groups;    /* number of groups (start/end marks) */
  Py_ssize_t mark[1];
} MatchObject;

typedef unsigned int (*SRE_TOLOWER_HOOK)(unsigned int ch);

typedef struct SRE_REPEAT_T {
  Py_ssize_t count;
  SRE_CODE* pattern;         /* points to REPEAT operator arguments */
  void* last_ptr;            /* helper to check for infinite loops */
  struct SRE_REPEAT_T* prev; /* points to previous repeat context */
} SRE_REPEAT;

typedef struct {
  /* string pointers */
  void* ptr;       /* current position (also end of current slice) */
  void* beginning; /* start of original string */
  void* start;     /* start of current slice */
  void* end;       /* end of original string */
  /* attributes for the match object */
  PyObject* string;
  Py_ssize_t pos, endpos;
  int isbytes;
  int charsize; /* character size */
  /* registers */
  Py_ssize_t lastindex;
  Py_ssize_t lastmark;
  void** mark;
  /* dynamically allocated stuff */
  char* data_stack;
  size_t data_stack_size;
  size_t data_stack_base;
  Py_buffer buffer;
  /* current repeat context */
  SRE_REPEAT* repeat;
  /* hooks */
  SRE_TOLOWER_HOOK lower, upper;
} SRE_STATE;

typedef struct {
  PyObject_HEAD PyObject* pattern;
  SRE_STATE state;
} ScannerObject;

#endif /* SRE_INCLUDED */
