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/* JSON parser
* Copyright (C) 2015-2019 Red Hat Inc.
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include <caml/alloc.h>
#include <caml/fail.h>
#include <caml/memory.h>
#include <caml/mlvalues.h>
#include <json.h>
#include <stdio.h>
#include <string.h>
#define JSON_NULL (Val_int (0)) /* Variants without parameters. */
#define JSON_STRING_TAG 0 /* Variants with parameters. */
#define JSON_INT_TAG 1
#define JSON_FLOAT_TAG 2
#define JSON_BOOL_TAG 3
#define JSON_LIST_TAG 4
#define JSON_DICT_TAG 5
value virt_builder_json_parser_tree_parse (value stringv);
value virt_builder_json_parser_tree_parse_file (value stringv);
static value
convert_json_t (json_object *val, int level)
{
CAMLparam0 ();
CAMLlocal5 (rv, v, tv, sv, consv);
if (level > 20)
caml_invalid_argument ("too many levels of object/array nesting");
switch (json_object_get_type (val)) {
case json_type_object: {
struct json_object_iterator it, itend;
const char *key;
json_object *jvalue;
rv = caml_alloc (1, JSON_DICT_TAG);
v = Val_int (0);
/* This will create the OCaml list backwards, but JSON
* dictionaries are supposed to be unordered so that shouldn't
* matter, right? Well except that for some consumers this does
* matter (eg. simplestreams which incorrectly uses a dict when it
* really should use an array).
*/
it = json_object_iter_begin (val);
itend = json_object_iter_end (val);
while (!json_object_iter_equal (&it, &itend)) {
key = json_object_iter_peek_name (&it);
tv = caml_alloc_tuple (2);
sv = caml_copy_string (key);
Store_field (tv, 0, sv);
jvalue = json_object_iter_peek_value (&it);
sv = convert_json_t (jvalue, level + 1);
Store_field (tv, 1, sv);
consv = caml_alloc (2, 0);
Store_field (consv, 1, v);
Store_field (consv, 0, tv);
v = consv;
json_object_iter_next (&it);
}
Store_field (rv, 0, v);
break;
}
case json_type_array: {
const size_t len = json_object_array_length (val);
size_t i;
json_object *jvalue;
rv = caml_alloc (1, JSON_LIST_TAG);
v = Val_int (0);
for (i = 0; i < len; ++i) {
/* Note we have to create the OCaml list backwards. */
jvalue = json_object_array_get_idx (val, len-i-1);
tv = convert_json_t (jvalue, level + 1);
consv = caml_alloc (2, 0);
Store_field (consv, 1, v);
Store_field (consv, 0, tv);
v = consv;
}
Store_field (rv, 0, v);
break;
}
case json_type_string:
rv = caml_alloc (1, JSON_STRING_TAG);
v = caml_copy_string (json_object_get_string (val));
Store_field (rv, 0, v);
break;
case json_type_double:
rv = caml_alloc (1, JSON_FLOAT_TAG);
v = caml_copy_double (json_object_get_double (val));
Store_field (rv, 0, v);
break;
case json_type_int:
rv = caml_alloc (1, JSON_INT_TAG);
v = caml_copy_int64 (json_object_get_int64 (val));
Store_field (rv, 0, v);
break;
case json_type_boolean:
rv = caml_alloc (1, JSON_BOOL_TAG);
Store_field (rv, 0, json_object_get_boolean (val) ? Val_true : Val_false);
break;
case json_type_null:
rv = JSON_NULL;
break;
}
CAMLreturn (rv);
}
value
virt_builder_json_parser_tree_parse (value stringv)
{
CAMLparam1 (stringv);
CAMLlocal1 (rv);
json_object *tree = NULL;
json_tokener *tok = NULL;
enum json_tokener_error err;
tok = json_tokener_new ();
json_tokener_set_flags (tok,
JSON_TOKENER_STRICT | JSON_TOKENER_VALIDATE_UTF8);
tree = json_tokener_parse_ex (tok,
String_val (stringv),
caml_string_length (stringv));
err = json_tokener_get_error (tok);
if (err != json_tokener_success) {
char buf[256];
snprintf (buf, sizeof buf, "JSON parse error: %s",
json_tokener_error_desc (err));
json_tokener_free (tok);
caml_invalid_argument (buf);
}
json_tokener_free (tok);
rv = convert_json_t (tree, 1);
json_object_put (tree);
CAMLreturn (rv);
}
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