regular_expressions.h

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/* Copyright (c) 2019, 2023, Oracle and/or its affiliates.
 
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   it under the terms of the GNU General Public License, version 2.0,
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef REGULAR_EXPRESSIONS_INCLUDED
#define REGULAR_EXPRESSIONS_INCLUDED
 
#include <regex>
 
#include "mysql/components/services/bits/psi_bits.h"
#include "prealloced_array.h"
 
extern std::regex explain_re;
extern std::regex opt_trace_re;
extern std::regex ps_re;
extern std::regex sp_re;
extern std::regex view_re;
 
struct st_regex {
  char *pattern; /* Pattern to be replaced */
  char *replace; /* String or expression to replace the pattern with */
  int icase;     /* true if the match is case insensitive */
};
 
struct st_replace_regex {
  st_replace_regex() : regex_arr(PSI_NOT_INSTRUMENTED) {}
  /* stores a list of st_regex subsitutions */
  Prealloced_array<st_regex, 128> regex_arr;
 
  /*
    Temporary storage areas for substitutions. To reduce unnessary copying
    and memory freeing/allocation, we pre-allocate two buffers, and alternate
    their use, one for input/one for output, the roles changing on the next
    st_regex substitution. At the end of substitutions, buf points to the
    one containing the final result.
  */
  char *buf{nullptr};
  char *even_buf{nullptr};
  char *odd_buf{nullptr};
  int even_buf_len{0};
  int odd_buf_len{0};
};
 
int multi_reg_replace(struct st_replace_regex *r, char *val, size_t *len);
int search_protocol_re(std::regex *re, const char *str);
 
#endif  // REGULAR_EXPRESSIONS_INCLUDED