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/*
* Copyright (C) 2013 Victor Toso.
*
* Contact: Victor Toso <me@victortoso.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include "lua-libraries.h"
#include <json-glib/json-glib.h>
#include <glib-object.h>
/* ================== Lua-Library Json Handlers ============================ */
/* Save key/values on the table in the stack if the value is an
* object or an array, it calls recursively the function again.
*
* @param L, pointer to the L with nil on top of it;
* @param reader, pointed to the first element of main object;
*
* returns: the table in the stack with all json values
*/
static void
build_table_from_json_reader (lua_State *L,
JsonReader *reader)
{
const GError *err = json_reader_get_error (reader);
if (err != NULL) {
GRL_WARNING ("Error when building json: %s", err->message);
return;
}
if (lua_isnil (L, -1)) {
/* In the first execution of this recursive call, the main json object
* does not have a member name. The nil is in the top of the stack and
* it shall be converted to the table with json content */
lua_pop (L, 1);
} else if (lua_istable (L, -1)) {
const gchar *member_name = json_reader_get_member_name (reader);
if (member_name)
lua_pushstring (L, member_name);
} else if (!lua_isnumber (L, -1)) {
GRL_DEBUG ("getting value to either table or array");
return;
}
if (json_reader_is_object (reader)) {
guint index_member = 0;
guint num_members = json_reader_count_members (reader);
lua_createtable (L, num_members, 0);
for (index_member = 0; index_member < num_members; index_member++) {
json_reader_read_element (reader, index_member);
build_table_from_json_reader (L, reader);
json_reader_end_element (reader);
}
} else if (json_reader_is_array (reader)) {
guint index_element = 0;
guint num_elements = json_reader_count_elements (reader);
lua_createtable (L, num_elements, 0);
for (index_element = 0; index_element < num_elements; index_element++) {
json_reader_read_element (reader, index_element);
lua_pushinteger (L, index_element + 1);
build_table_from_json_reader (L, reader);
json_reader_end_element (reader);
}
} else if (json_reader_is_value (reader)) {
if (json_reader_get_null_value (reader)) {
lua_pushnil (L);
} else {
/* value of the element */
JsonNode *value = json_reader_get_value (reader);
switch (json_node_get_value_type (value)) {
case G_TYPE_STRING:
lua_pushstring (L, json_reader_get_string_value (reader));
break;
case G_TYPE_INT64:
lua_pushinteger (L, json_reader_get_int_value (reader));
break;
case G_TYPE_DOUBLE:
lua_pushnumber (L, json_reader_get_double_value (reader));
break;
case G_TYPE_BOOLEAN:
lua_pushnumber (L, json_reader_get_boolean_value (reader));
break;
default:
GRL_DEBUG ("'%d' (json-node-type) is not being handled",
(gint) json_node_get_value_type (value));
lua_pushnil (L);
}
}
}
if (lua_gettop (L) > 3) {
/* save this key/value on previous table */
lua_settable (L, -3);
}
}
/* grl.lua.json.string_to_table
*
* @json_str: (string) A Json object as a string.
*
* @return: All json content as a table.
*/
static gint
grl_json_parse_string (lua_State *L)
{
JsonParser *parser = NULL;
JsonReader *reader = NULL;
const gchar *json_str = NULL;
GError *err = NULL;
luaL_argcheck (L, lua_isstring (L, 1), 1, "json string expected");
json_str = lua_tostring (L, 1);
parser = json_parser_new ();
if (!json_parser_load_from_data (parser, json_str, -1, &err)) {
GRL_DEBUG ("Can't parse json string: '%s'", err->message);
g_error_free (err);
g_object_unref (parser);
return 0;
}
reader = json_reader_new (json_parser_get_root (parser));
/* The return of recursive function will be a table with all
* json content in it */
lua_pushnil (L);
build_table_from_json_reader (L, reader);
g_object_unref (reader);
g_object_unref (parser);
return 1;
}
gint
luaopen_json (lua_State *L)
{
static const luaL_Reg json_library_fn[] = {
{"string_to_table", &grl_json_parse_string},
{NULL, NULL}
};
luaL_newlib (L, json_library_fn);
return 1;
}
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