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Dqn/Dqn_Jsmn.h

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#ifndef DQN_JSMN_H
#define DQN_JSMN_H
// -----------------------------------------------------------------------------
// NOTE: Dqn_Jsmn
// -----------------------------------------------------------------------------
// Some helper functions ontop of the jsmn API to make it more ergonomic to use.
// JSMN is embedded in this source file for convenience.
//
// -----------------------------------------------------------------------------
// NOTE: Configuration
// -----------------------------------------------------------------------------
// #define DQN_JSMN_IMPLEMENTATION
// Define this in one and only one C++ file to enable the implementation
// code of the header file. This will also automatically enable the JSMN
// implementation.
//
#if !defined(DQN_H)
#error You must include "Dqn.h" before including "Dqn_Jsmn.h"
#endif // DQN_H
// -----------------------------------------------------------------------------
// NOTE: JSMN Configuration
// -----------------------------------------------------------------------------
// JSMN has its own set of #defines that are definable by the user. See the JSMN
// header file below for more information.
//
// -----------------------------------------------------------------------------
// NOTE: JSMN Header File: commit 053d3cd29200edb1bfd181d917d140c16c1f8834
// -----------------------------------------------------------------------------
/*
* MIT License
*
* Copyright (c) 2010 Serge Zaitsev
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef JSMN_H
#define JSMN_H
#include <stddef.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifdef JSMN_STATIC
#define JSMN_API static
#else
#define JSMN_API extern
#endif
/**
* JSON type identifier. Basic types are:
* o Object
* o Array
* o String
* o Other primitive: number, boolean (true/false) or null
*/
typedef enum {
JSMN_UNDEFINED = 0,
JSMN_OBJECT = 1,
JSMN_ARRAY = 2,
JSMN_STRING = 3,
JSMN_PRIMITIVE = 4
} jsmntype_t;
enum jsmnerr {
/* Not enough tokens were provided */
JSMN_ERROR_NOMEM = -1,
/* Invalid character inside JSON string */
JSMN_ERROR_INVAL = -2,
/* The string is not a full JSON packet, more bytes expected */
JSMN_ERROR_PART = -3
};
/**
* JSON token description.
* type type (object, array, string etc.)
* start start position in JSON data string
* end end position in JSON data string
*/
typedef struct jsmntok {
jsmntype_t type;
int start;
int end;
int size;
#ifdef JSMN_PARENT_LINKS
int parent;
#endif
} jsmntok_t;
/**
* JSON parser. Contains an array of token blocks available. Also stores
* the string being parsed now and current position in that string.
*/
typedef struct jsmn_parser {
unsigned int pos; /* offset in the JSON string */
unsigned int toknext; /* next token to allocate */
int toksuper; /* superior token node, e.g. parent object or array */
} jsmn_parser;
/**
* Create JSON parser over an array of tokens
*/
JSMN_API void jsmn_init(jsmn_parser *parser);
/**
* Run JSON parser. It parses a JSON data string into and array of tokens, each
* describing
* a single JSON object.
*/
JSMN_API int jsmn_parse(jsmn_parser *parser, const char *js, const size_t len,
jsmntok_t *tokens, const unsigned int num_tokens);
#ifdef __cplusplus
}
#endif
#endif // JSMN_H
// -----------------------------------------------------------------------------
// Header File
// -----------------------------------------------------------------------------
struct Dqn_JsmnError
{
jsmntok_t token;
char const *cpp_func;
char const *cpp_file; // The file of the .cpp/h source code that triggered the error
int cpp_line; // The line of the .cpp/h source code that triggered the error
};
struct Dqn_JsmnErrorHandle
{
Dqn_ArenaAllocator *arena;
Dqn_List<Dqn_JsmnError> list;
};
void Dqn_JsmnErrorHandle_AddError (Dqn_JsmnErrorHandle *err_handle, char const *func, char const *file, int line);
Dqn_String Dqn_JsmnToken_String (Dqn_String json, jsmntok_t token);
Dqn_b32 Dqn_JsmnToken_Bool (Dqn_String json, jsmntok_t token);
Dqn_u64 Dqn_JsmnToken_U64 (Dqn_String json, jsmntok_t token);
jsmntok_t *Dqn_JsmnToken_AdvanceItPastObject(jsmntok_t *start_it, Dqn_JsmnErrorHandle *err_handle, Dqn_String json);
jsmntok_t *Dqn_JsmnToken_AdvanceItPastArray (jsmntok_t *start_it, Dqn_JsmnErrorHandle *err_handle, Dqn_String json);
#define Dqn_JsmnToken_ExpectBool(json, token, err_handle) Dqn_JsmnToken__ExpectBool(json, token, err_handle, __FILE__, __LINE__)
#define Dqn_JsmnToken_ExpectNumber(json, token, err_handle) Dqn_JsmnToken__ExpectNumber(json, token, err_handle, __FILE__, __LINE__)
#define Dqn_JsmnToken_ExpectString(token, err_handle) Dqn_JsmnToken__ExpectString(token, err_handle, __FILE__, __LINE__)
#define Dqn_JsmnToken_ExpectArray(token, err_handle) Dqn_JsmnToken__ExpectArray(token, err_handle, __FILE__, __LINE__)
#define Dqn_JsmnToken_ExpectObject(token, err_handle) Dqn_JsmnToken__ExpectObject(token, err_handle, __FILE__, __LINE__)
#define DQN_JSMN_ERROR_HANDLE_DUMP(handle) \
for (Dqn_ListChunk<Dqn_JsmnError> *chunk = handle.list.head; chunk; chunk = chunk->next) \
{ \
for (auto *error = chunk->data; error != (chunk->data + chunk->count); error++) \
{ \
DQN_LOG_E("Json parsing error at %s from %s:%d", \
error->cpp_func, \
Dqn_Str_FileNameFromPath(error->cpp_file), \
error->cpp_line); \
} \
}
#endif // DQN_JSMN_H
#if defined(DQN_JSMN_IMPLEMENTATION)
// -----------------------------------------------------------------------------
// Implementation
// -----------------------------------------------------------------------------
void Dqn_JsmnErrorHandle_AddError(Dqn_JsmnErrorHandle *err_handle, char const *func, char const *file, int line)
{
if (!err_handle)
return;
if (!err_handle->list.head)
err_handle->list = Dqn_List_InitWithArena<Dqn_JsmnError>(err_handle->arena, 16);
Dqn_JsmnError *error = Dqn_List_Make(&err_handle->list, 1);
if (error)
{
error->cpp_func = func;
error->cpp_file = file;
error->cpp_line = line;
}
}
Dqn_b32 Dqn_JsmnToken__ExpectBool(Dqn_String json, jsmntok_t token, Dqn_JsmnErrorHandle *err_handle, char const *file, int line)
{
DQN_ASSERT_MSG(token.start < json.size, "%I64d < %I64u", token.start, json.size);
char ch = json.str[token.start];
Dqn_b32 result = token.type == JSMN_PRIMITIVE && (ch == 't' || ch == 'f');
if (!result) Dqn_JsmnErrorHandle_AddError(err_handle, __func__, file, line);
return result;
}
Dqn_b32 Dqn_JsmnToken__ExpectNumber(Dqn_String json, jsmntok_t token, Dqn_JsmnErrorHandle *err_handle, char const *file, int line)
{
DQN_ASSERT_MSG(token.start < json.size, "%I64d < %I64u", token.start, json.size);
char ch = json.str[token.start];
Dqn_b32 result = token.type == JSMN_PRIMITIVE && (ch == '-' || Dqn_Char_IsDigit(ch));
if (!result) Dqn_JsmnErrorHandle_AddError(err_handle, __func__, file, line);
return result;
}
Dqn_b32 Dqn_JsmnToken__ExpectString(jsmntok_t token, Dqn_JsmnErrorHandle *err_handle, char const *file, int line)
{
Dqn_b32 result = token.type == JSMN_STRING;
if (!result) Dqn_JsmnErrorHandle_AddError(err_handle, __func__, file, line);
return result;
}
Dqn_b32 Dqn_JsmnToken__ExpectArray(jsmntok_t token, Dqn_JsmnErrorHandle *err_handle, char const *file, int line)
{
Dqn_b32 result = token.type == JSMN_ARRAY;
if (!result) Dqn_JsmnErrorHandle_AddError(err_handle, __func__, file, line);
return result;
}
Dqn_b32 Dqn_JsmnToken__ExpectObject(jsmntok_t token, Dqn_JsmnErrorHandle *err_handle, char const *file, int line)
{
Dqn_b32 result = token.type == JSMN_OBJECT;
if (!result) Dqn_JsmnErrorHandle_AddError(err_handle, __func__, file, line);
return result;
}
Dqn_String Dqn_JsmnToken_String(Dqn_String json, jsmntok_t token)
{
Dqn_String result = Dqn_String_Init(json.str + token.start, token.end - token.start);
return result;
}
Dqn_b32 Dqn_JsmnToken_Bool(Dqn_String json, jsmntok_t token)
{
DQN_ASSERT_MSG(token.start < json.size, "%I64d < %I64u", token.start, json.size);
char ch = json.str[token.start];
Dqn_b32 result = ch == 't';
if (!result) { DQN_ASSERT(ch == 'f'); }
return result;
}
Dqn_u64 Dqn_JsmnToken_U64(Dqn_String json, jsmntok_t token)
{
DQN_ASSERT_MSG(token.start < json.size, "%I64d < %I64u", token.start, json.size);
Dqn_String string = Dqn_JsmnToken_String(json, token);
Dqn_u64 result = Dqn_String_ToU64(string);
return result;
}
jsmntok_t *Dqn_JsmnToken_AdvanceItPastObject(jsmntok_t *start_it, Dqn_JsmnErrorHandle *err_handle, Dqn_String json)
{
jsmntok_t *result = start_it;
if (!Dqn_JsmnToken_ExpectObject(*result, err_handle)) return result;
jsmntok_t *object = result++;
for (int index = 0; index < object->size; index++)
{
jsmntok_t *key = result++;
jsmntok_t *value = result++;
Dqn_String key_str = Dqn_JsmnToken_String(json, *key);
Dqn_String value_str = Dqn_JsmnToken_String(json, *value); (void)value_str;
if (value->type == JSMN_OBJECT)
{
result = Dqn_JsmnToken_AdvanceItPastObject(value, err_handle, json);
}
else if (value->type == JSMN_ARRAY)
{
result = Dqn_JsmnToken_AdvanceItPastArray(value, err_handle, json);
}
}
return result;
}
jsmntok_t *Dqn_JsmnToken_AdvanceItPastArray(jsmntok_t *start_it, Dqn_JsmnErrorHandle *err_handle, Dqn_String json)
{
jsmntok_t *result = start_it;
if (!Dqn_JsmnToken_ExpectArray(*result, err_handle)) return result;
jsmntok_t *array = result++;
for (int index = 0; index < array->size; index++)
{
jsmntok_t *value = result++;
Dqn_String value_str = Dqn_JsmnToken_String(json, *value); (void)value_str;
if (value->type == JSMN_OBJECT)
{
Dqn_JsmnToken_AdvanceItPastObject(start_it, err_handle, json);
}
else if (value->type == JSMN_ARRAY)
{
Dqn_JsmnToken_AdvanceItPastArray(start_it, err_handle, json);
}
}
return result;
}
// -----------------------------------------------------------------------------
// JSMN Implementation
// -----------------------------------------------------------------------------
#ifdef __cplusplus
extern "C" {
#endif
/**
* Allocates a fresh unused token from the token pool.
*/
static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser, jsmntok_t *tokens,
const size_t num_tokens) {
jsmntok_t *tok;
if (parser->toknext >= num_tokens) {
return NULL;
}
tok = &tokens[parser->toknext++];
tok->start = tok->end = -1;
tok->size = 0;
#ifdef JSMN_PARENT_LINKS
tok->parent = -1;
#endif
return tok;
}
/**
* Fills token type and boundaries.
*/
static void jsmn_fill_token(jsmntok_t *token, const jsmntype_t type,
const int start, const int end) {
token->type = type;
token->start = start;
token->end = end;
token->size = 0;
}
/**
* Fills next available token with JSON primitive.
*/
static int jsmn_parse_primitive(jsmn_parser *parser, const char *js,
const size_t len, jsmntok_t *tokens,
const size_t num_tokens) {
jsmntok_t *token;
int start;
start = parser->pos;
for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
switch (js[parser->pos]) {
#ifndef JSMN_STRICT
/* In strict mode primitive must be followed by "," or "}" or "]" */
case ':':
#endif
case '\t':
case '\r':
case '\n':
case ' ':
case ',':
case ']':
case '}':
goto found;
default:
/* to quiet a warning from gcc*/
break;
}
if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
parser->pos = start;
return JSMN_ERROR_INVAL;
}
}
#ifdef JSMN_STRICT
/* In strict mode primitive must be followed by a comma/object/array */
parser->pos = start;
return JSMN_ERROR_PART;
#endif
found:
if (tokens == NULL) {
parser->pos--;
return 0;
}
token = jsmn_alloc_token(parser, tokens, num_tokens);
if (token == NULL) {
parser->pos = start;
return JSMN_ERROR_NOMEM;
}
jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
#ifdef JSMN_PARENT_LINKS
token->parent = parser->toksuper;
#endif
parser->pos--;
return 0;
}
/**
* Fills next token with JSON string.
*/
static int jsmn_parse_string(jsmn_parser *parser, const char *js,
const size_t len, jsmntok_t *tokens,
const size_t num_tokens) {
jsmntok_t *token;
int start = parser->pos;
parser->pos++;
/* Skip starting quote */
for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
char c = js[parser->pos];
/* Quote: end of string */
if (c == '\"') {
if (tokens == NULL) {
return 0;
}
token = jsmn_alloc_token(parser, tokens, num_tokens);
if (token == NULL) {
parser->pos = start;
return JSMN_ERROR_NOMEM;
}
jsmn_fill_token(token, JSMN_STRING, start + 1, parser->pos);
#ifdef JSMN_PARENT_LINKS
token->parent = parser->toksuper;
#endif
return 0;
}
/* Backslash: Quoted symbol expected */
if (c == '\\' && parser->pos + 1 < len) {
int i;
parser->pos++;
switch (js[parser->pos]) {
/* Allowed escaped symbols */
case '\"':
case '/':
case '\\':
case 'b':
case 'f':
case 'r':
case 'n':
case 't':
break;
/* Allows escaped symbol \uXXXX */
case 'u':
parser->pos++;
for (i = 0; i < 4 && parser->pos < len && js[parser->pos] != '\0';
i++) {
/* If it isn't a hex character we have an error */
if (!((js[parser->pos] >= 48 && js[parser->pos] <= 57) || /* 0-9 */
(js[parser->pos] >= 65 && js[parser->pos] <= 70) || /* A-F */
(js[parser->pos] >= 97 && js[parser->pos] <= 102))) { /* a-f */
parser->pos = start;
return JSMN_ERROR_INVAL;
}
parser->pos++;
}
parser->pos--;
break;
/* Unexpected symbol */
default:
parser->pos = start;
return JSMN_ERROR_INVAL;
}
}
}
parser->pos = start;
return JSMN_ERROR_PART;
}
/**
* Parse JSON string and fill tokens.
*/
JSMN_API int jsmn_parse(jsmn_parser *parser, const char *js, const size_t len,
jsmntok_t *tokens, const unsigned int num_tokens) {
int r;
int i;
jsmntok_t *token;
int count = parser->toknext;
for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
char c;
jsmntype_t type;
c = js[parser->pos];
switch (c) {
case '{':
case '[':
count++;
if (tokens == NULL) {
break;
}
token = jsmn_alloc_token(parser, tokens, num_tokens);
if (token == NULL) {
return JSMN_ERROR_NOMEM;
}
if (parser->toksuper != -1) {
jsmntok_t *t = &tokens[parser->toksuper];
#ifdef JSMN_STRICT
/* In strict mode an object or array can't become a key */
if (t->type == JSMN_OBJECT) {
return JSMN_ERROR_INVAL;
}
#endif
t->size++;
#ifdef JSMN_PARENT_LINKS
token->parent = parser->toksuper;
#endif
}
token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
token->start = parser->pos;
parser->toksuper = parser->toknext - 1;
break;
case '}':
case ']':
if (tokens == NULL) {
break;
}
type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
#ifdef JSMN_PARENT_LINKS
if (parser->toknext < 1) {
return JSMN_ERROR_INVAL;
}
token = &tokens[parser->toknext - 1];
for (;;) {
if (token->start != -1 && token->end == -1) {
if (token->type != type) {
return JSMN_ERROR_INVAL;
}
token->end = parser->pos + 1;
parser->toksuper = token->parent;
break;
}
if (token->parent == -1) {
if (token->type != type || parser->toksuper == -1) {
return JSMN_ERROR_INVAL;
}
break;
}
token = &tokens[token->parent];
}
#else
for (i = parser->toknext - 1; i >= 0; i--) {
token = &tokens[i];
if (token->start != -1 && token->end == -1) {
if (token->type != type) {
return JSMN_ERROR_INVAL;
}
parser->toksuper = -1;
token->end = parser->pos + 1;
break;
}
}
/* Error if unmatched closing bracket */
if (i == -1) {
return JSMN_ERROR_INVAL;
}
for (; i >= 0; i--) {
token = &tokens[i];
if (token->start != -1 && token->end == -1) {
parser->toksuper = i;
break;
}
}
#endif
break;
case '\"':
r = jsmn_parse_string(parser, js, len, tokens, num_tokens);
if (r < 0) {
return r;
}
count++;
if (parser->toksuper != -1 && tokens != NULL) {
tokens[parser->toksuper].size++;
}
break;
case '\t':
case '\r':
case '\n':
case ' ':
break;
case ':':
parser->toksuper = parser->toknext - 1;
break;
case ',':
if (tokens != NULL && parser->toksuper != -1 &&
tokens[parser->toksuper].type != JSMN_ARRAY &&
tokens[parser->toksuper].type != JSMN_OBJECT) {
#ifdef JSMN_PARENT_LINKS
parser->toksuper = tokens[parser->toksuper].parent;
#else
for (i = parser->toknext - 1; i >= 0; i--) {
if (tokens[i].type == JSMN_ARRAY || tokens[i].type == JSMN_OBJECT) {
if (tokens[i].start != -1 && tokens[i].end == -1) {
parser->toksuper = i;
break;
}
}
}
#endif
}
break;
#ifdef JSMN_STRICT
/* In strict mode primitives are: numbers and booleans */
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case 't':
case 'f':
case 'n':
/* And they must not be keys of the object */
if (tokens != NULL && parser->toksuper != -1) {
const jsmntok_t *t = &tokens[parser->toksuper];
if (t->type == JSMN_OBJECT ||
(t->type == JSMN_STRING && t->size != 0)) {
return JSMN_ERROR_INVAL;
}
}
#else
/* In non-strict mode every unquoted value is a primitive */
default:
#endif
r = jsmn_parse_primitive(parser, js, len, tokens, num_tokens);
if (r < 0) {
return r;
}
count++;
if (parser->toksuper != -1 && tokens != NULL) {
tokens[parser->toksuper].size++;
}
break;
#ifdef JSMN_STRICT
/* Unexpected char in strict mode */
default:
return JSMN_ERROR_INVAL;
#endif
}
}
if (tokens != NULL) {
for (i = parser->toknext - 1; i >= 0; i--) {
/* Unmatched opened object or array */
if (tokens[i].start != -1 && tokens[i].end == -1) {
return JSMN_ERROR_PART;
}
}
}
return count;
}
/**
* Creates a new parser based over a given buffer with an array of tokens
* available.
*/
JSMN_API void jsmn_init(jsmn_parser *parser) {
parser->pos = 0;
parser->toknext = 0;
parser->toksuper = -1;
}
#ifdef __cplusplus
}
#endif
#endif // DQN_JSMN_IMPLEMENTATION
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