mariadb/unittest/json_lib/json_lib-t.c

/* Copyright (c) 2016, MariaDB Corp. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */

#include "my_config.h"
#include "config.h"
#include <tap.h>
#include <my_global.h>
#include <my_sys.h>
#include <json_lib.h>

/* The character set used for JSON all over this test. */
static CHARSET_INFO *ci;

#define s_e(j) j, j + strlen((const char *) j)


struct st_parse_result
{
  int n_keys;
  int n_values;
  int n_arrays;
  int n_objects;
  int n_steps;
  int error;
  uchar keyname_csum;
};


static void parse_json(const uchar *j, struct st_parse_result *result)
{
  json_engine_t je;

  bzero(result, sizeof(*result));

  if (json_scan_start(&je, ci, s_e(j)))
    return;

  do
  {
    result->n_steps++;
    switch (je.state)
    {
    case JST_KEY:
      result->n_keys++;
      while (json_read_keyname_chr(&je) == 0)
      {
        result->keyname_csum^= je.s.c_next;
      }
      if (je.s.error)
        return;
      break;
    case JST_VALUE:
      result->n_values++;
      break;
    case JST_OBJ_START:
      result->n_objects++;
      break;
    case JST_ARRAY_START:
      result->n_arrays++;
      break;
    default:
      break;
    };
  } while (json_scan_next(&je) == 0);

  result->error= je.s.error;
}


static const uchar *js0= (const uchar *) "123";
static const uchar *js1= (const uchar *) "[123, \"text\"]";
static const uchar *js2= (const uchar *) "{\"key1\":123, \"key2\":\"text\"}";
static const uchar *js3= (const uchar *) "{\"key1\":{\"ikey1\":321},"
                                          "\"key2\":[\"text\", 321]}";

/*
  Test json_lib functions to parse JSON.
*/
static void
test_json_parsing()
{
  struct st_parse_result r;
  parse_json(js0, &r);
  ok(r.n_steps == 1 && r.n_values == 1, "simple value");
  parse_json(js1, &r);
  ok(r.n_steps == 5 && r.n_values == 3 && r.n_arrays == 1, "array");
  parse_json(js2, &r);
  ok(r.n_steps == 5 && r.n_keys == 2 && r.n_objects == 1 && r.keyname_csum == 3,
     "object");
  parse_json(js3, &r);
  ok(r.n_steps == 12 && r.n_keys == 3 && r.n_objects == 2 &&
     r.n_arrays == 1 && r.keyname_csum == 44,
     "complex json");
}


static const uchar *p0= (const uchar *) "$.key1[12].*[*]";
/*
  Test json_lib functions to parse JSON path.
*/
static void
test_path_parsing()
{
  json_path_t p;
  if (json_path_setup(&p, ci, s_e(p0)))
    return;
  ok(p.last_step - p.steps == 4 && 
     p.steps[0].type == JSON_PATH_ARRAY_WILD &&
     p.steps[1].type == JSON_PATH_KEY &&
     p.steps[2].type == JSON_PATH_ARRAY && p.steps[2].n_item == 12 &&
     p.steps[3].type == JSON_PATH_KEY_WILD &&
     p.steps[4].type == JSON_PATH_ARRAY_WILD,
     "path");
}


static const uchar *fj0=(const uchar *) "[{\"k0\":123, \"k1\":123, \"k1\":123},"
                                        " {\"k3\":321, \"k4\":\"text\"},"
                                        " {\"k1\":[\"text\"], \"k2\":123}]";
static const uchar *fp0= (const uchar *) "$[*].k1";
/*
  Test json_lib functions to search through JSON.
*/
static void
test_search()
{
  json_engine_t je;
  json_path_t p;
  json_path_step_t *cur_step;
  int n_matches, scal_values;
  int array_counters[JSON_DEPTH_LIMIT];

  if (json_scan_start(&je, ci, s_e(fj0)) ||
      json_path_setup(&p, ci, s_e(fp0)))
    return;

  cur_step= p.steps;
  n_matches= scal_values= 0;
  while (json_find_path(&je, &p, &cur_step, array_counters) == 0)
  {
    n_matches++;
    if (json_read_value(&je))
      return;
    if (json_value_scalar(&je))
    {
      scal_values++;
      if (json_scan_next(&je))
        return;
    }
    else
    {
      if (json_skip_level(&je) || json_scan_next(&je))
        return;
    }

  }

  ok(n_matches == 3, "search");
}


int main()
{
  ci= &my_charset_utf8mb3_general_ci;

  plan(6);
  diag("Testing json_lib functions.");

  test_json_parsing();
  test_path_parsing();
  test_search();

  return exit_status();
}