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/**
* vim: set ts=4 :
* =============================================================================
* sm-json
* Provides a pure SourcePawn implementation of JSON encoding and decoding.
* https://github.com/clugg/sm-json
*
* sm-json (C)2018 James D. (clug)
* SourceMod (C)2004-2008 AlliedModders LLC. 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, version 3.0, as published by the
* Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* As a special exception, AlliedModders LLC gives you permission to link the
* code of this program (as well as its derivative works) to "Half-Life 2," the
* "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
* by the Valve Corporation. You must obey the GNU General Public License in
* all respects for all other code used. Additionally, AlliedModders LLC grants
* this exception to all derivative works. AlliedModders LLC defines further
* exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
* or <http://www.sourcemod.net/license.php>.
*/
#if defined _json_encode_helpers_included
#endinput
#endif
#define _json_encode_helpers_included
#include <string>
/**
* @section Calculating buffer sizes for JSON cells.
*/
/**
* Calculates the maximum buffer length required to
* store the JSON cell representation of a string.
*
* @param maxlen The string's current length or buffer size.
* @return Maximum buffer length.
*/
stock int json_cell_string_size(int maxlen) {
return (maxlen * 2) + 3; // * 2 for potential escaping, + 2 for surrounding quotes + NULL
}
/**
* Calculates the maximum buffer length required to
* store the JSON cell representation of an int.
*
* @param input The int.
* @return Maximum buffer length.
*/
stock int json_cell_int_size(int input) {
if (input == 0) {
return 2; // "0" + NULL
}
return ((input < 0) ? 1 : 0) + RoundToFloor(Logarithm(FloatAbs(float(input)), 10.0)) + 2; // neg sign + number of digits + NULL
}
/**
* Calculates the maximum buffer length required to
* store the JSON cell representation of a float.
*
* @return Maximum buffer length.
*/
stock int json_cell_float_size() {
return JSON_FLOAT_BUFFER_SIZE; // fixed-length
}
/**
* Calculates the maximum buffer length required to
* store the JSON cell representation of a bool.
*
* @return Maximum buffer length.
*/
stock int json_cell_bool_size() {
return 6; // "true|false" + NULL
}
/**
* Calculates the maximum buffer length required to
* store the JSON cell representation of null.
*
* @return Maximum buffer length.
*/
stock int json_cell_null_size() {
return 5; // "null" + NULL
}
/**
* @section Generating JSON cells.
*/
/**
* Generates the JSON cell representation of a string.
*
* @param input Value to generate output for.
* @param output String buffer to store output.
* @param maxlen Maximum size of string buffer.
*/
stock void json_cell_string(const char[] input, char[] output, int maxlen) {
strcopy(output, maxlen, "_"); // add dummy char at start so first quotation isn't escaped
StrCat(output, maxlen, input); // add input string to output
// escape everything according to JSON spec
json_escape_string(output, maxlen);
// surround string with quotations
output[0] = '"';
StrCat(output, maxlen, "\"");
}
/**
* Generates the JSON cell representation of an int.
*
* @param input Value to generate output for.
* @param output String buffer to store output.
* @param maxlen Maximum size of string buffer.
*/
stock void json_cell_int(int input, char[] output, int maxlen) {
IntToString(input, output, maxlen);
}
/**
* Generates the JSON cell representation of a float.
*
* @param input Value to generate output for.
* @param output String buffer to store output.
* @param maxlen Maximum size of string buffer.
*/
stock void json_cell_float(float input, char[] output, int maxlen) {
FloatToString(input, output, maxlen);
}
/**
* Generates the JSON cell representation of a bool.
*
* @param input Value to generate output for.
* @param output String buffer to store output.
* @param maxlen Maximum size of string buffer.
*/
stock void json_cell_bool(bool input, char[] output, int maxlen) {
strcopy(output, maxlen, (input) ? "true" : "false");
}
/**
* Generates the JSON cell representation of null.
*
* @param output String buffer to store output.
* @param maxlen Maximum size of string buffer.
*/
stock void json_cell_null(char[] output, int maxlen) {
strcopy(output, maxlen, "null");
}
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