MbedJSONValue - Minimalist JSON parser and serializer (inspired b…

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Minimalist JSON parser and serializer (inspired by picojson). Used by MbedJSONRpc.

Dependents: RPC_mbed_client WebSocket_test pseudo_comet RPC_Wifly_HelloWorld ... more

MbedJSONValue.cpp@2:e39bfa3e917d, 2011-09-22 (annotated)

Committer:: samux
Date:: Thu Sep 22 10:54:29 2011 +0000
Revision:: 2:e39bfa3e917d
Parent:: 0:0cf0e27feaad
Child:: 3:f2ffae08b963

Who changed what in which revision?

User	Revision	Line number	New contents of line
samux	0:0cf0e27feaad	1	#include "MbedJSONValue.h"
samux	0:0cf0e27feaad	2
samux	0:0cf0e27feaad	3	# include <stdlib.h>
samux	0:0cf0e27feaad	4	# include <stdio.h>
samux	0:0cf0e27feaad	5
samux	0:0cf0e27feaad	6	// Clean up
samux	0:0cf0e27feaad	7	void MbedJSONValue::clean() {
samux	0:0cf0e27feaad	8	switch (_type) {
samux	0:0cf0e27feaad	9	case TypeString:
samux	0:0cf0e27feaad	10	delete _value.asString;
samux	0:0cf0e27feaad	11	break;
samux	0:0cf0e27feaad	12	case TypeArray:
samux	0:0cf0e27feaad	13	for (int i = 0; i < index_array; i++)
samux	0:0cf0e27feaad	14	delete array[i];
samux	0:0cf0e27feaad	15	index_array = 0;
samux	0:0cf0e27feaad	16	break;
samux	0:0cf0e27feaad	17	case TypeObject:
samux	0:0cf0e27feaad	18	for (int i = 0; i < index_token; i++) {
samux	0:0cf0e27feaad	19	delete token[i];
samux	0:0cf0e27feaad	20	delete token_name[i];
samux	0:0cf0e27feaad	21	}
samux	0:0cf0e27feaad	22	index_token = 0;
samux	0:0cf0e27feaad	23	break;
samux	0:0cf0e27feaad	24	default:
samux	0:0cf0e27feaad	25	break;
samux	0:0cf0e27feaad	26	}
samux	0:0cf0e27feaad	27	_type = TypeNull;
samux	0:0cf0e27feaad	28	_type = TypeNull;
samux	0:0cf0e27feaad	29	}
samux	0:0cf0e27feaad	30
samux	0:0cf0e27feaad	31	bool MbedJSONValue::hasMember(char * name)
samux	0:0cf0e27feaad	32	{
samux	0:0cf0e27feaad	33	for(int i = 0; i < index_token; i++)
samux	0:0cf0e27feaad	34	if( !strcmp(name, (*(token_name[i])).c_str() ))
samux	0:0cf0e27feaad	35	return true;
samux	0:0cf0e27feaad	36	return false;
samux	0:0cf0e27feaad	37	}
samux	0:0cf0e27feaad	38
samux	0:0cf0e27feaad	39
samux	0:0cf0e27feaad	40	void copy(const std::string& s, std::back_insert_iterator<std::string> oi) {
samux	0:0cf0e27feaad	41	std::copy(s.begin(), s.end(), oi);
samux	0:0cf0e27feaad	42	}
samux	0:0cf0e27feaad	43
samux	0:0cf0e27feaad	44	void serialize_str(const std::string& s, std::back_insert_iterator<std::string> oi) {
samux	0:0cf0e27feaad	45	*oi++ = '"';
samux	0:0cf0e27feaad	46	for (std::string::const_iterator i = s.begin(); i != s.end(); ++i) {
samux	0:0cf0e27feaad	47	switch (*i) {
samux	0:0cf0e27feaad	48	#define MAP(val, sym) case val: copy(sym, oi); break
samux	0:0cf0e27feaad	49	MAP('"', "\\\"");
samux	0:0cf0e27feaad	50	MAP('\\', "\\\\");
samux	0:0cf0e27feaad	51	MAP('/', "\\/");
samux	0:0cf0e27feaad	52	MAP('\b', "\\b");
samux	0:0cf0e27feaad	53	MAP('\f', "\\f");
samux	0:0cf0e27feaad	54	MAP('\n', "\\n");
samux	0:0cf0e27feaad	55	MAP('\r', "\\r");
samux	0:0cf0e27feaad	56	MAP('\t', "\\t");
samux	0:0cf0e27feaad	57	#undef MAP
samux	0:0cf0e27feaad	58	default:
samux	0:0cf0e27feaad	59	if ((unsigned char)i < 0x20 \|\| i == 0x7f) {
samux	0:0cf0e27feaad	60	char buf[7];
samux	0:0cf0e27feaad	61	sprintf(buf, "\\u%04x", *i & 0xff);
samux	0:0cf0e27feaad	62	copy(buf, buf + 6, oi);
samux	0:0cf0e27feaad	63	} else {
samux	0:0cf0e27feaad	64	oi++ = i;
samux	0:0cf0e27feaad	65	}
samux	0:0cf0e27feaad	66	break;
samux	0:0cf0e27feaad	67	}
samux	0:0cf0e27feaad	68	}
samux	0:0cf0e27feaad	69	*oi++ = '"';
samux	0:0cf0e27feaad	70	}
samux	0:0cf0e27feaad	71
samux	0:0cf0e27feaad	72	std::string MbedJSONValue::serialize(){
samux	0:0cf0e27feaad	73	std::string s;
samux	0:0cf0e27feaad	74	serialize(std::back_inserter(s));
samux	0:0cf0e27feaad	75	return s;
samux	0:0cf0e27feaad	76	}
samux	0:0cf0e27feaad	77
samux	0:0cf0e27feaad	78	std::string MbedJSONValue::to_str(){
samux	0:0cf0e27feaad	79	switch (_type) {
samux	0:0cf0e27feaad	80	case TypeNull:
samux	0:0cf0e27feaad	81	return "null";
samux	0:0cf0e27feaad	82	case TypeBoolean:
samux	2:e39bfa3e917d	83	printf("boolean\r\n");
samux	0:0cf0e27feaad	84	return _value.asBool ? "true" : "false";
samux	0:0cf0e27feaad	85	case TypeInt: {
samux	0:0cf0e27feaad	86	char buf[10];
samux	0:0cf0e27feaad	87	sprintf(buf, "%d", _value.asInt);
samux	0:0cf0e27feaad	88	return buf;
samux	0:0cf0e27feaad	89	}
samux	0:0cf0e27feaad	90	case TypeDouble: {
samux	0:0cf0e27feaad	91	char buf[10];
samux	0:0cf0e27feaad	92	sprintf(buf, "%f", _value.asDouble);
samux	0:0cf0e27feaad	93	return buf;
samux	0:0cf0e27feaad	94	}
samux	0:0cf0e27feaad	95	default:
samux	0:0cf0e27feaad	96	break;
samux	0:0cf0e27feaad	97	}
samux	0:0cf0e27feaad	98	return NULL;
samux	0:0cf0e27feaad	99	}
samux	0:0cf0e27feaad	100
samux	0:0cf0e27feaad	101
samux	0:0cf0e27feaad	102
samux	0:0cf0e27feaad	103	void MbedJSONValue::serialize(std::back_insert_iterator<std::string> oi) {
samux	0:0cf0e27feaad	104	switch (_type) {
samux	0:0cf0e27feaad	105	case TypeString:
samux	0:0cf0e27feaad	106	serialize_str(*_value.asString, oi);
samux	0:0cf0e27feaad	107	break;
samux	0:0cf0e27feaad	108	case TypeArray: {
samux	0:0cf0e27feaad	109	*oi++ = '[';
samux	0:0cf0e27feaad	110	for (int i = 0; i < index_array; i++) {
samux	0:0cf0e27feaad	111	if (i)
samux	0:0cf0e27feaad	112	*oi++ = ',';
samux	0:0cf0e27feaad	113	(*this)[i].serialize(oi);
samux	0:0cf0e27feaad	114	}
samux	0:0cf0e27feaad	115	*oi++ = ']';
samux	0:0cf0e27feaad	116	break;
samux	0:0cf0e27feaad	117	}
samux	0:0cf0e27feaad	118	case TypeObject: {
samux	0:0cf0e27feaad	119	*oi++ = '{';
samux	0:0cf0e27feaad	120	for (int i = 0; i < index_token; i++) {
samux	0:0cf0e27feaad	121	if (i)
samux	0:0cf0e27feaad	122	*oi++ = ',';
samux	0:0cf0e27feaad	123	serialize_str(*(token_name[i]), oi);
samux	0:0cf0e27feaad	124	*oi++ = ':';
samux	0:0cf0e27feaad	125	(*(token[i])).serialize(oi);
samux	0:0cf0e27feaad	126	}
samux	0:0cf0e27feaad	127	*oi++ = '}';
samux	0:0cf0e27feaad	128	break;
samux	0:0cf0e27feaad	129	}
samux	0:0cf0e27feaad	130	default:
samux	0:0cf0e27feaad	131	copy(to_str(), oi);
samux	0:0cf0e27feaad	132	break;
samux	0:0cf0e27feaad	133	}
samux	0:0cf0e27feaad	134	}
samux	0:0cf0e27feaad	135
samux	0:0cf0e27feaad	136
samux	0:0cf0e27feaad	137
samux	0:0cf0e27feaad	138	MbedJSONValue& MbedJSONValue::operator[](int i) {
samux	0:0cf0e27feaad	139	_type = TypeArray;
samux	0:0cf0e27feaad	140	if (i < NB_TOKEN && index_array == i ) {
samux	0:0cf0e27feaad	141	#ifdef DEBUG
samux	0:0cf0e27feaad	142	printf("will add an element to the array\r\n");
samux	0:0cf0e27feaad	143	#endif
samux	0:0cf0e27feaad	144	array[i] = new MbedJSONValue();
samux	0:0cf0e27feaad	145	index_array++;
samux	0:0cf0e27feaad	146	return *(array[i]);
samux	0:0cf0e27feaad	147	}
samux	0:0cf0e27feaad	148	if (i < NB_TOKEN && index_array > i)
samux	0:0cf0e27feaad	149	return *(array[i]);
samux	0:0cf0e27feaad	150
samux	0:0cf0e27feaad	151	//if the user is not doing something wrong, this code is never executed!!
samux	0:0cf0e27feaad	152	return *(new MbedJSONValue());
samux	0:0cf0e27feaad	153	}
samux	0:0cf0e27feaad	154
samux	0:0cf0e27feaad	155	MbedJSONValue& MbedJSONValue::operator[](std::string k) {
samux	0:0cf0e27feaad	156	_type = TypeObject;
samux	0:0cf0e27feaad	157	for (int i = 0; i < index_token; i++) {
samux	0:0cf0e27feaad	158	#ifdef DEBUG
samux	0:0cf0e27feaad	159	printf("k: %s\r\n", k.c_str());
samux	0:0cf0e27feaad	160	printf("str: %s\r\n", token_name[i]->c_str());
samux	0:0cf0e27feaad	161	#endif
samux	0:0cf0e27feaad	162	//existing token
samux	0:0cf0e27feaad	163	if (!strcmp(k.c_str(), token_name[i]->c_str())) {
samux	0:0cf0e27feaad	164	#ifdef DEBUG
samux	0:0cf0e27feaad	165	printf("token found: %d\r\n", i);
samux	0:0cf0e27feaad	166	#endif
samux	0:0cf0e27feaad	167	return *(token[i]);
samux	0:0cf0e27feaad	168	}
samux	0:0cf0e27feaad	169	}
samux	0:0cf0e27feaad	170
samux	0:0cf0e27feaad	171	if(index_token >= NB_TOKEN)
samux	0:0cf0e27feaad	172	index_token = NB_TOKEN - 1;
samux	0:0cf0e27feaad	173	//non existing token
samux	0:0cf0e27feaad	174	token_name[index_token] = new std::string(k);
samux	0:0cf0e27feaad	175	token[index_token] = new MbedJSONValue();
samux	0:0cf0e27feaad	176	index_token++;
samux	0:0cf0e27feaad	177	return *(token[index_token - 1]);
samux	0:0cf0e27feaad	178	}
samux	0:0cf0e27feaad	179
samux	0:0cf0e27feaad	180	MbedJSONValue& MbedJSONValue::operator[](std::string k) const
samux	0:0cf0e27feaad	181	{
samux	0:0cf0e27feaad	182	for (int i = 0; i < index_token; i++) {
samux	0:0cf0e27feaad	183	#ifdef DEBUG
samux	0:0cf0e27feaad	184	printf("k: %s\r\n", k.c_str());
samux	0:0cf0e27feaad	185	printf("str: %s\r\n", token_name[i]->c_str());
samux	0:0cf0e27feaad	186	#endif
samux	0:0cf0e27feaad	187	if (!strcmp(k.c_str(), token_name[i]->c_str())) {
samux	0:0cf0e27feaad	188	#ifdef DEBUG
samux	0:0cf0e27feaad	189	printf("token found: %d\r\n", i);
samux	0:0cf0e27feaad	190	#endif
samux	0:0cf0e27feaad	191	return *(token[i]);
samux	0:0cf0e27feaad	192	}
samux	0:0cf0e27feaad	193	}
samux	0:0cf0e27feaad	194
samux	0:0cf0e27feaad	195	//if the user is not doing something wrong, this code is never executed!!
samux	0:0cf0e27feaad	196	return *(new MbedJSONValue());
samux	0:0cf0e27feaad	197	}
samux	0:0cf0e27feaad	198
samux	0:0cf0e27feaad	199
samux	0:0cf0e27feaad	200	// Operators
samux	0:0cf0e27feaad	201	MbedJSONValue& MbedJSONValue::operator=(MbedJSONValue const& rhs) {
samux	0:0cf0e27feaad	202	if (this != &rhs) {
samux	0:0cf0e27feaad	203	clean();
samux	0:0cf0e27feaad	204	_type = rhs._type;
samux	0:0cf0e27feaad	205	switch (_type) {
samux	0:0cf0e27feaad	206	case TypeBoolean:
samux	0:0cf0e27feaad	207	_value.asBool = rhs._value.asBool;
samux	0:0cf0e27feaad	208	break;
samux	0:0cf0e27feaad	209	case TypeInt:
samux	0:0cf0e27feaad	210	_value.asInt = rhs._value.asInt;
samux	0:0cf0e27feaad	211	break;
samux	0:0cf0e27feaad	212	case TypeDouble:
samux	0:0cf0e27feaad	213	_value.asDouble = rhs._value.asDouble;
samux	0:0cf0e27feaad	214	break;
samux	0:0cf0e27feaad	215	case TypeString:
samux	0:0cf0e27feaad	216	_value.asString = new std::string(*rhs._value.asString);
samux	0:0cf0e27feaad	217	break;
samux	0:0cf0e27feaad	218	case TypeArray:
samux	0:0cf0e27feaad	219	for (int i = 0; i < rhs.index_array; i++)
samux	0:0cf0e27feaad	220	(*this)[i] = rhs[i];
samux	0:0cf0e27feaad	221	case TypeObject:
samux	0:0cf0e27feaad	222	for (int i = 0; i < rhs.index_token; i++)
samux	0:0cf0e27feaad	223	(this)[(rhs.token_name[i])] = rhs[*(rhs.token_name[i])];
samux	0:0cf0e27feaad	224	default:
samux	0:0cf0e27feaad	225	break;
samux	0:0cf0e27feaad	226	}
samux	0:0cf0e27feaad	227	}
samux	0:0cf0e27feaad	228	return *this;
samux	0:0cf0e27feaad	229	}
samux	0:0cf0e27feaad	230
samux	0:0cf0e27feaad	231
samux	0:0cf0e27feaad	232	// Works for strings, arrays, and structs.
samux	0:0cf0e27feaad	233	int MbedJSONValue::size() const {
samux	0:0cf0e27feaad	234	switch (_type) {
samux	0:0cf0e27feaad	235	case TypeString:
samux	0:0cf0e27feaad	236	return int(_value.asString->size());
samux	0:0cf0e27feaad	237	case TypeArray:
samux	0:0cf0e27feaad	238	return index_array;
samux	0:0cf0e27feaad	239	case TypeObject:
samux	0:0cf0e27feaad	240	return index_token;
samux	0:0cf0e27feaad	241	default:
samux	0:0cf0e27feaad	242	break;
samux	0:0cf0e27feaad	243	}
samux	0:0cf0e27feaad	244	return -1;
samux	0:0cf0e27feaad	245	}
samux	0:0cf0e27feaad	246

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Type:	Library
Created:	22 Sep 2011
Imports:	1243
Forks:	7
Commits:	5
Dependents:	76
Dependencies:	0
Followers:	81

MbedJSONValue.cpp@2:e39bfa3e917d, 2011-09-22 (annotated)

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