MbedJSONValue - Minimalist JSON parser and serializer (inspired b…

Users » samux » Code » MbedJSONValue

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

Dependents: RPC_mbed_client WebSocket_test pseudo_comet RPC_Wifly_HelloWorld ... more

MbedJSONValue.h@4:10a99cdf7846, 2011-09-22 (annotated)

Committer:: samux
Date:: Thu Sep 22 10:57:37 2011 +0000
Revision:: 4:10a99cdf7846
Parent:: 3:f2ffae08b963

Who changed what in which revision?

User	Revision	Line number	New contents of line
samux	0:0cf0e27feaad	1	/**
samux	0:0cf0e27feaad	2	* @author Samuel Mokrani
samux	0:0cf0e27feaad	3	*
samux	0:0cf0e27feaad	4	* @section LICENSE
samux	0:0cf0e27feaad	5	*
samux	0:0cf0e27feaad	6	* Copyright (c) 2011 mbed
samux	0:0cf0e27feaad	7	*
samux	0:0cf0e27feaad	8	* Permission is hereby granted, free of charge, to any person obtaining a copy
samux	0:0cf0e27feaad	9	* of this software and associated documentation files (the "Software"), to deal
samux	0:0cf0e27feaad	10	* in the Software without restriction, including without limitation the rights
samux	0:0cf0e27feaad	11	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
samux	0:0cf0e27feaad	12	* copies of the Software, and to permit persons to whom the Software is
samux	0:0cf0e27feaad	13	* furnished to do so, subject to the following conditions:
samux	0:0cf0e27feaad	14	*
samux	0:0cf0e27feaad	15	* The above copyright notice and this permission notice shall be included in
samux	0:0cf0e27feaad	16	* all copies or substantial portions of the Software.
samux	0:0cf0e27feaad	17	*
samux	0:0cf0e27feaad	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
samux	0:0cf0e27feaad	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
samux	0:0cf0e27feaad	20	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
samux	0:0cf0e27feaad	21	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
samux	0:0cf0e27feaad	22	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
samux	0:0cf0e27feaad	23	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
samux	0:0cf0e27feaad	24	* THE SOFTWARE.
samux	0:0cf0e27feaad	25	*
samux	0:0cf0e27feaad	26	* @section DESCRIPTION
samux	2:e39bfa3e917d	27	* Types Abstraction. Minimalist JSON serializer and parser (inspired by picojson). Is used by MbedJSONRpc.
samux	0:0cf0e27feaad	28	*
samux	0:0cf0e27feaad	29	*/
samux	0:0cf0e27feaad	30
samux	0:0cf0e27feaad	31	#ifndef _Mbed_RPC_VALUE_H_
samux	0:0cf0e27feaad	32	#define _Mbed_RPC_VALUE_H_
samux	0:0cf0e27feaad	33
samux	0:0cf0e27feaad	34	#define NB_TOKEN 20
samux	0:0cf0e27feaad	35	/!< Number maximum of MbedJSONValue in an array or an object /
samux	0:0cf0e27feaad	36
samux	0:0cf0e27feaad	37	#include <string>
samux	0:0cf0e27feaad	38	#include <stdio.h>
samux	0:0cf0e27feaad	39	#include <stdlib.h>
samux	0:0cf0e27feaad	40	#include <string.h>
samux	0:0cf0e27feaad	41
samux	0:0cf0e27feaad	42	/** MbedJSONValue class
samux	0:0cf0e27feaad	43	*
samux	0:0cf0e27feaad	44	* Example:
samux	0:0cf0e27feaad	45	* - creation of an MbedJSONValue of type TypeObject containing two others MbedJSONValue:
samux	0:0cf0e27feaad	46	* -one array of one string and one integer identified by "my_array"
samux	0:0cf0e27feaad	47	* -a boolean identified by "my_boolean"
samux	0:0cf0e27feaad	48	* - serialization in JSON format of this object
samux	0:0cf0e27feaad	49	* @code
samux	2:e39bfa3e917d	50	* #include "mbed.h"
samux	2:e39bfa3e917d	51	* #include "MbedJSONValue.h"
samux	2:e39bfa3e917d	52	* #include <string>
samux	2:e39bfa3e917d	53	*
samux	2:e39bfa3e917d	54	* int main() {
samux	2:e39bfa3e917d	55	*
samux	2:e39bfa3e917d	56	* MbedJSONValue demo;
samux	2:e39bfa3e917d	57	* std::string s;
samux	0:0cf0e27feaad	58	*
samux	2:e39bfa3e917d	59	* //fill the object
samux	2:e39bfa3e917d	60	* demo["my_array"][0] = "demo_string";
samux	2:e39bfa3e917d	61	* demo["my_array"][1] = 10;
samux	2:e39bfa3e917d	62	* demo["my_boolean"] = false;
samux	0:0cf0e27feaad	63	*
samux	2:e39bfa3e917d	64	* //serialize it into a JSON string
samux	2:e39bfa3e917d	65	* s = demo.serialize();
samux	2:e39bfa3e917d	66	* printf("json: %s\r\n", s.c_str());
samux	2:e39bfa3e917d	67	* }
samux	0:0cf0e27feaad	68	*
samux	0:0cf0e27feaad	69	* @endcode
samux	0:0cf0e27feaad	70	*
samux	0:0cf0e27feaad	71	* Example:
samux	0:0cf0e27feaad	72	* - creation of an MbedJSONValue from a JSON string
samux	0:0cf0e27feaad	73	* - extraction of different values from this existing MbedJSONValue
samux	0:0cf0e27feaad	74	* @code
samux	2:e39bfa3e917d	75	* #include "mbed.h"
samux	2:e39bfa3e917d	76	* #include "MbedJSONValue.h"
samux	2:e39bfa3e917d	77	* #include <string>
samux	0:0cf0e27feaad	78	*
samux	2:e39bfa3e917d	79	* int main() {
samux	2:e39bfa3e917d	80	* MbedJSONValue demo;
samux	0:0cf0e27feaad	81	*
samux	2:e39bfa3e917d	82	* const char * json = "{\"my_array\": [\"demo_string\", 10], \"my_boolean\": true}";
samux	2:e39bfa3e917d	83	*
samux	2:e39bfa3e917d	84	* //parse the previous string and fill the object demo
samux	2:e39bfa3e917d	85	* parse(demo, json);
samux	0:0cf0e27feaad	86	*
samux	2:e39bfa3e917d	87	* std::string my_str;
samux	2:e39bfa3e917d	88	* int my_int;
samux	2:e39bfa3e917d	89	* bool my_bool;
samux	0:0cf0e27feaad	90	*
samux	2:e39bfa3e917d	91	* my_str = demo["my_array"][0].get<std::string>();
samux	2:e39bfa3e917d	92	* my_int = demo["my_array"][1].get<int>();
samux	2:e39bfa3e917d	93	* my_bool = demo["my_boolean"].get<bool>();
samux	2:e39bfa3e917d	94	*
samux	2:e39bfa3e917d	95	* printf("my_str: %s\r\n", my_str.c_str());
samux	2:e39bfa3e917d	96	* printf("my_int: %d\r\n", my_int);
samux	2:e39bfa3e917d	97	* printf("my_bool: %s\r\n", my_bool ? "true" : "false");
samux	2:e39bfa3e917d	98	* }
samux	0:0cf0e27feaad	99	* @endcode
samux	0:0cf0e27feaad	100	*/
samux	0:0cf0e27feaad	101	class MbedJSONValue {
samux	0:0cf0e27feaad	102	public:
samux	0:0cf0e27feaad	103
samux	0:0cf0e27feaad	104	/**
samux	0:0cf0e27feaad	105	* \enum Type
samux	0:0cf0e27feaad	106	* \brief All types which can be used
samux	0:0cf0e27feaad	107	*/
samux	0:0cf0e27feaad	108	enum Type {
samux	0:0cf0e27feaad	109	TypeNull, /!< Null type /
samux	0:0cf0e27feaad	110	TypeBoolean, /!< Boolean /
samux	0:0cf0e27feaad	111	TypeInt, /!< Integer /
samux	0:0cf0e27feaad	112	TypeDouble, /!< Double /
samux	0:0cf0e27feaad	113	TypeString, /!< String /
samux	4:10a99cdf7846	114	TypeArray, /!< Array (contains MbedJSONValue) /
samux	4:10a99cdf7846	115	TypeObject /!< Object (contains MbedJSONValue identified by a name)/
samux	0:0cf0e27feaad	116	};
samux	0:0cf0e27feaad	117
samux	0:0cf0e27feaad	118	/**
samux	0:0cf0e27feaad	119	* MbedJSONValue constructor of type TypeNull
samux	0:0cf0e27feaad	120	*/
samux	0:0cf0e27feaad	121	MbedJSONValue() : _type(TypeNull), index_array(0), index_token(0) {}
samux	0:0cf0e27feaad	122
samux	0:0cf0e27feaad	123	/**
samux	0:0cf0e27feaad	124	* MbedJSONValue constructor of type TypeBoolean
samux	0:0cf0e27feaad	125	*
samux	0:0cf0e27feaad	126	* @param value the object created will be initialized with this boolean
samux	0:0cf0e27feaad	127	*/
samux	0:0cf0e27feaad	128	MbedJSONValue(bool value) : _type(TypeBoolean), index_array(0), index_token(0) {
samux	0:0cf0e27feaad	129	_value.asBool = value;
samux	0:0cf0e27feaad	130	}
samux	0:0cf0e27feaad	131
samux	0:0cf0e27feaad	132	/**
samux	0:0cf0e27feaad	133	* MbedJSONValue constructor of type TypeInt
samux	0:0cf0e27feaad	134	*
samux	0:0cf0e27feaad	135	* @param value the object created will be initialized with this integer
samux	0:0cf0e27feaad	136	*/
samux	0:0cf0e27feaad	137	MbedJSONValue(int value) : _type(TypeInt), index_array(0), index_token(0) {
samux	0:0cf0e27feaad	138	_value.asInt = value;
samux	0:0cf0e27feaad	139	}
samux	0:0cf0e27feaad	140
samux	0:0cf0e27feaad	141	/**
samux	0:0cf0e27feaad	142	* MbedJSONValue constructor of type TypeDouble
samux	0:0cf0e27feaad	143	*
samux	0:0cf0e27feaad	144	* @param value the object created will be initialized with this double
samux	0:0cf0e27feaad	145	*/
samux	0:0cf0e27feaad	146	MbedJSONValue(double value) : _type(TypeDouble), index_array(0), index_token(0) {
samux	0:0cf0e27feaad	147	_value.asDouble = value;
samux	0:0cf0e27feaad	148	}
samux	0:0cf0e27feaad	149
samux	0:0cf0e27feaad	150	/**
samux	0:0cf0e27feaad	151	* MbedJSONValue constructor of type TypeString
samux	0:0cf0e27feaad	152	*
samux	0:0cf0e27feaad	153	* @param value the object created will be initialized with this string
samux	0:0cf0e27feaad	154	*/
samux	0:0cf0e27feaad	155	MbedJSONValue(std::string const& value) : _type(TypeString), index_array(0), index_token(0) {
samux	0:0cf0e27feaad	156	_value.asString = new std::string(value);
samux	0:0cf0e27feaad	157	}
samux	0:0cf0e27feaad	158
samux	0:0cf0e27feaad	159	/**
samux	0:0cf0e27feaad	160	* MbedJSONValue constructor of type TypeString
samux	0:0cf0e27feaad	161	*
samux	0:0cf0e27feaad	162	* @param value the object created will be initialized with this string
samux	0:0cf0e27feaad	163	*/
samux	0:0cf0e27feaad	164	MbedJSONValue(const char* value) : _type(TypeString), index_array(0), index_token(0) {
samux	0:0cf0e27feaad	165	_value.asString = new std::string(value);
samux	0:0cf0e27feaad	166	}
samux	0:0cf0e27feaad	167
samux	0:0cf0e27feaad	168	/**
samux	0:0cf0e27feaad	169	* Copy constructor
samux	0:0cf0e27feaad	170	*
samux	0:0cf0e27feaad	171	* @param rhs object which will be copied
samux	0:0cf0e27feaad	172	*/
samux	0:0cf0e27feaad	173	MbedJSONValue(MbedJSONValue const& rhs) : _type(TypeNull) { *this = rhs; }
samux	0:0cf0e27feaad	174
samux	0:0cf0e27feaad	175	/**
samux	0:0cf0e27feaad	176	* Destructor
samux	0:0cf0e27feaad	177	*/
samux	0:0cf0e27feaad	178	~MbedJSONValue() { clean(); }
samux	0:0cf0e27feaad	179
samux	0:0cf0e27feaad	180	/**
samux	0:0cf0e27feaad	181	* = Operator overloading for an MbedJSONValue from an MbedJSONValue
samux	0:0cf0e27feaad	182	*
samux	0:0cf0e27feaad	183	* @param rhs object
samux	0:0cf0e27feaad	184	* @return a reference on the MbedJSONValue affected
samux	0:0cf0e27feaad	185	*/
samux	0:0cf0e27feaad	186	MbedJSONValue& operator=(MbedJSONValue const & rhs);
samux	0:0cf0e27feaad	187
samux	0:0cf0e27feaad	188	/**
samux	0:0cf0e27feaad	189	* = Operator overloading for an MbedJSONValue from an int
samux	0:0cf0e27feaad	190	*
samux	0:0cf0e27feaad	191	* @param rhs integer
samux	0:0cf0e27feaad	192	* @return a reference on the MbedJSONValue affected
samux	0:0cf0e27feaad	193	*/
samux	0:0cf0e27feaad	194	MbedJSONValue& operator=(int const& rhs) { return operator=(MbedJSONValue(rhs)); }
samux	0:0cf0e27feaad	195
samux	0:0cf0e27feaad	196	/**
samux	2:e39bfa3e917d	197	* = Operator overloading for an MbedJSONValue from a boolean
samux	2:e39bfa3e917d	198	*
samux	2:e39bfa3e917d	199	* @param rhs boolean
samux	2:e39bfa3e917d	200	* @return a reference on the MbedJSONValue affected
samux	2:e39bfa3e917d	201	*/
samux	2:e39bfa3e917d	202	MbedJSONValue& operator=(bool const& rhs) { return operator=(MbedJSONValue(rhs)); }
samux	2:e39bfa3e917d	203
samux	2:e39bfa3e917d	204	/**
samux	0:0cf0e27feaad	205	* = Operator overloading for an MbedJSONValue from a double
samux	0:0cf0e27feaad	206	*
samux	0:0cf0e27feaad	207	* @param rhs double
samux	0:0cf0e27feaad	208	* @return a reference on the MbedJSONValue affected
samux	0:0cf0e27feaad	209	*/
samux	0:0cf0e27feaad	210	MbedJSONValue& operator=(double const& rhs) { return operator=(MbedJSONValue(rhs)); }
samux	0:0cf0e27feaad	211
samux	0:0cf0e27feaad	212	/**
samux	0:0cf0e27feaad	213	* = Operator overloading for an MbedJSONValue from a string
samux	0:0cf0e27feaad	214	*
samux	0:0cf0e27feaad	215	* @param rhs string
samux	0:0cf0e27feaad	216	* @return a reference on the MbedJSONValue affected
samux	0:0cf0e27feaad	217	*/
samux	0:0cf0e27feaad	218	MbedJSONValue& operator=(const char* rhs) { return operator=(MbedJSONValue(std::string(rhs))); }
samux	0:0cf0e27feaad	219
samux	0:0cf0e27feaad	220
samux	0:0cf0e27feaad	221	/**
samux	0:0cf0e27feaad	222	* [] Operator overloading for an MbedJSONValue.
samux	0:0cf0e27feaad	223	* Each TypeObject object can contain an array of NB_TOKEN MbedJSONValue.
samux	0:0cf0e27feaad	224	* This operator is useful to create an array or to retrieve an MbedJSONValue of an existing array.
samux	0:0cf0e27feaad	225	*
samux	0:0cf0e27feaad	226	* @param i index of the array
samux	0:0cf0e27feaad	227	* @return a reference on the MbedJSONValue created or retrieved
samux	0:0cf0e27feaad	228	*/
samux	0:0cf0e27feaad	229	MbedJSONValue& operator[](int i);
samux	0:0cf0e27feaad	230
samux	0:0cf0e27feaad	231	/**
samux	0:0cf0e27feaad	232	* [] Operator overloading for an MbedJSONValue.
samux	0:0cf0e27feaad	233	* Each TypeObject MbedJSONValue can contain NB_TOKEN MbedJSONValue IDENTIFIED BY A NAME
samux	0:0cf0e27feaad	234	* This operator is useful to create a TypeObject MbedJSONValue or to retrieve an MbedJSONValue of an existing TypeObject.
samux	0:0cf0e27feaad	235	*
samux	0:0cf0e27feaad	236	*
samux	0:0cf0e27feaad	237	* @param str identifier of the sub MbedJSONValue
samux	0:0cf0e27feaad	238	* @return a reference on the MbedJSONValue created or retrieved
samux	0:0cf0e27feaad	239	*/
samux	0:0cf0e27feaad	240	MbedJSONValue& operator[](std::string str);
samux	0:0cf0e27feaad	241
samux	0:0cf0e27feaad	242	/**
samux	0:0cf0e27feaad	243	* Retrieve the value of an MbedJSONValue object.
samux	0:0cf0e27feaad	244	*
samux	0:0cf0e27feaad	245	* Let's suppose that we have an MbedJSONValue of type TypeString.
samux	0:0cf0e27feaad	246	* To retrieve this string, you have to do:
samux	0:0cf0e27feaad	247	* my_obj.get<std::string>();
samux	0:0cf0e27feaad	248	*
samux	0:0cf0e27feaad	249	* @return A contant reference on the value of the object
samux	0:0cf0e27feaad	250	*/
samux	0:0cf0e27feaad	251	template <typename T> const T& get() const;
samux	0:0cf0e27feaad	252
samux	0:0cf0e27feaad	253	/**
samux	0:0cf0e27feaad	254	* Retrieve the value of an MbedJSONValue object.
samux	0:0cf0e27feaad	255	*
samux	0:0cf0e27feaad	256	* Let's suppose that we have an MbedJSONValue of type TypeInt.
samux	0:0cf0e27feaad	257	* To retrieve this integer, you have to do:
samux	0:0cf0e27feaad	258	* my_obj.get<int>();
samux	0:0cf0e27feaad	259	*
samux	0:0cf0e27feaad	260	* @return A reference on the value of the object
samux	0:0cf0e27feaad	261	*/
samux	0:0cf0e27feaad	262	template <typename T> T& get();
samux	0:0cf0e27feaad	263
samux	0:0cf0e27feaad	264
samux	0:0cf0e27feaad	265	/**
samux	0:0cf0e27feaad	266	* Return the type of the MbedJSONValue object
samux	0:0cf0e27feaad	267	*
samux	0:0cf0e27feaad	268	* @return type of the MbedJSONValue object
samux	0:0cf0e27feaad	269	*/
samux	0:0cf0e27feaad	270	Type const &getType() const {
samux	0:0cf0e27feaad	271	return _type;
samux	0:0cf0e27feaad	272	}
samux	0:0cf0e27feaad	273
samux	0:0cf0e27feaad	274	/**
samux	0:0cf0e27feaad	275	* Return the size of an MbedJSONValue object (works for TypeString, TypeArray or TypeObject)
samux	0:0cf0e27feaad	276	*
samux	0:0cf0e27feaad	277	* @return size
samux	0:0cf0e27feaad	278	*/
samux	0:0cf0e27feaad	279	int size() const;
samux	0:0cf0e27feaad	280
samux	0:0cf0e27feaad	281	/**
samux	0:0cf0e27feaad	282	* Check for the existence in a TypeObject object of member identified by name
samux	0:0cf0e27feaad	283	*
samux	0:0cf0e27feaad	284	* @param name Identifier
samux	0:0cf0e27feaad	285	* @return true if the object is of type TypeObject AND contains a member named "name", false otherwise
samux	0:0cf0e27feaad	286	*/
samux	0:0cf0e27feaad	287	bool hasMember(char * name);
samux	0:0cf0e27feaad	288
samux	0:0cf0e27feaad	289	/**
samux	0:0cf0e27feaad	290	* Convert an MbedJSONValue in a JSON frame
samux	0:0cf0e27feaad	291	*
samux	0:0cf0e27feaad	292	* @return JSON string
samux	0:0cf0e27feaad	293	*/
samux	0:0cf0e27feaad	294	std::string serialize();
samux	0:0cf0e27feaad	295
samux	0:0cf0e27feaad	296	protected:
samux	0:0cf0e27feaad	297
samux	0:0cf0e27feaad	298	// object type
samux	0:0cf0e27feaad	299	Type _type;
samux	0:0cf0e27feaad	300
samux	0:0cf0e27feaad	301	//indexes of TypeObject and TypeArray
samux	0:0cf0e27feaad	302	int index_array;
samux	0:0cf0e27feaad	303	int index_token;
samux	0:0cf0e27feaad	304
samux	0:0cf0e27feaad	305	//an object can contain NB_TOKEN tokens. Each token have a name
samux	0:0cf0e27feaad	306	MbedJSONValue * token[NB_TOKEN];
samux	0:0cf0e27feaad	307	std::string * token_name[NB_TOKEN];
samux	0:0cf0e27feaad	308
samux	0:0cf0e27feaad	309	//an object can contain an array of NB_TOKEN elements
samux	0:0cf0e27feaad	310	MbedJSONValue * array[NB_TOKEN];
samux	0:0cf0e27feaad	311
samux	0:0cf0e27feaad	312	// Clean up
samux	0:0cf0e27feaad	313	void clean();
samux	0:0cf0e27feaad	314
samux	0:0cf0e27feaad	315	union {
samux	0:0cf0e27feaad	316	bool asBool;
samux	0:0cf0e27feaad	317	int asInt;
samux	0:0cf0e27feaad	318	double asDouble;
samux	0:0cf0e27feaad	319	std::string* asString;
samux	0:0cf0e27feaad	320	} _value;
samux	0:0cf0e27feaad	321
samux	0:0cf0e27feaad	322
samux	0:0cf0e27feaad	323	MbedJSONValue& operator[](int i) const { return *(array[i]); }
samux	0:0cf0e27feaad	324	MbedJSONValue& operator[](std::string k) const;
samux	0:0cf0e27feaad	325
samux	0:0cf0e27feaad	326	std::string to_str();
samux	0:0cf0e27feaad	327	void serialize(std::back_insert_iterator<std::string> os);
samux	0:0cf0e27feaad	328
samux	0:0cf0e27feaad	329	};
samux	0:0cf0e27feaad	330
samux	0:0cf0e27feaad	331
samux	0:0cf0e27feaad	332	#define GET(ctype, var) \
samux	0:0cf0e27feaad	333	template <> inline const ctype& MbedJSONValue::get<ctype>() const { \
samux	0:0cf0e27feaad	334	return var; \
samux	0:0cf0e27feaad	335	} \
samux	0:0cf0e27feaad	336	template <> inline ctype& MbedJSONValue::get<ctype>() { \
samux	0:0cf0e27feaad	337	return var; \
samux	0:0cf0e27feaad	338	}
samux	0:0cf0e27feaad	339	GET(bool, _value.asBool)
samux	0:0cf0e27feaad	340	GET(double, _value.asDouble)
samux	0:0cf0e27feaad	341	GET(int, _value.asInt)
samux	0:0cf0e27feaad	342	GET(std::string, *_value.asString)
samux	0:0cf0e27feaad	343	#undef GET
samux	0:0cf0e27feaad	344
samux	0:0cf0e27feaad	345
samux	0:0cf0e27feaad	346	//Input class for JSON parser
samux	0:0cf0e27feaad	347	class input {
samux	0:0cf0e27feaad	348	protected:
samux	0:0cf0e27feaad	349	const char * cur_;
samux	0:0cf0e27feaad	350	const char * end_;
samux	0:0cf0e27feaad	351	int last_ch_;
samux	0:0cf0e27feaad	352	bool ungot_;
samux	0:0cf0e27feaad	353	int line_;
samux	0:0cf0e27feaad	354	public:
samux	0:0cf0e27feaad	355	input(const char * first, const char * last) : cur_(first), end_(last), last_ch_(-1), ungot_(false), line_(1) {};
samux	0:0cf0e27feaad	356
samux	0:0cf0e27feaad	357	int getc() {
samux	0:0cf0e27feaad	358	if (ungot_) {
samux	0:0cf0e27feaad	359	ungot_ = false;
samux	0:0cf0e27feaad	360	return last_ch_;
samux	0:0cf0e27feaad	361	}
samux	0:0cf0e27feaad	362	if (cur_ == end_) {
samux	0:0cf0e27feaad	363	last_ch_ = -1;
samux	0:0cf0e27feaad	364	return -1;
samux	0:0cf0e27feaad	365	}
samux	0:0cf0e27feaad	366	if (last_ch_ == '\n') {
samux	0:0cf0e27feaad	367	line_++;
samux	0:0cf0e27feaad	368	}
samux	0:0cf0e27feaad	369	last_ch_ = *cur_++ & 0xff;
samux	0:0cf0e27feaad	370	return last_ch_;
samux	0:0cf0e27feaad	371	}
samux	0:0cf0e27feaad	372
samux	0:0cf0e27feaad	373	void ungetc() {
samux	0:0cf0e27feaad	374	if (last_ch_ != -1) {
samux	0:0cf0e27feaad	375	ungot_ = true;
samux	0:0cf0e27feaad	376	}
samux	0:0cf0e27feaad	377	}
samux	0:0cf0e27feaad	378
samux	0:0cf0e27feaad	379	const char * cur() const {
samux	0:0cf0e27feaad	380	return cur_;
samux	0:0cf0e27feaad	381	}
samux	0:0cf0e27feaad	382	int line() const {
samux	0:0cf0e27feaad	383	return line_;
samux	0:0cf0e27feaad	384	}
samux	0:0cf0e27feaad	385	void skip_ws() {
samux	0:0cf0e27feaad	386	while (1) {
samux	0:0cf0e27feaad	387	int ch = getc();
samux	0:0cf0e27feaad	388	if (! (ch == ' ' \|\| ch == '\t' \|\| ch == '\n' \|\| ch == '\r')) {
samux	0:0cf0e27feaad	389	ungetc();
samux	0:0cf0e27feaad	390	break;
samux	0:0cf0e27feaad	391	}
samux	0:0cf0e27feaad	392	}
samux	0:0cf0e27feaad	393	}
samux	0:0cf0e27feaad	394	int expect(int expect) {
samux	0:0cf0e27feaad	395	skip_ws();
samux	0:0cf0e27feaad	396	if (getc() != expect) {
samux	0:0cf0e27feaad	397	ungetc();
samux	0:0cf0e27feaad	398	return false;
samux	0:0cf0e27feaad	399	}
samux	0:0cf0e27feaad	400	return true;
samux	0:0cf0e27feaad	401	}
samux	0:0cf0e27feaad	402	bool match(const std::string& pattern) {
samux	0:0cf0e27feaad	403	for (std::string::const_iterator pi(pattern.begin());
samux	0:0cf0e27feaad	404	pi != pattern.end();
samux	0:0cf0e27feaad	405	++pi) {
samux	0:0cf0e27feaad	406	if (getc() != *pi) {
samux	0:0cf0e27feaad	407	ungetc();
samux	0:0cf0e27feaad	408	return false;
samux	0:0cf0e27feaad	409	}
samux	0:0cf0e27feaad	410	}
samux	0:0cf0e27feaad	411	return true;
samux	0:0cf0e27feaad	412	}
samux	0:0cf0e27feaad	413	};
samux	0:0cf0e27feaad	414
samux	0:0cf0e27feaad	415
samux	0:0cf0e27feaad	416
samux	0:0cf0e27feaad	417	inline const char * parse(MbedJSONValue& out, const char * first, const char * last, std::string* err);
samux	0:0cf0e27feaad	418
samux	0:0cf0e27feaad	419	/**
samux	0:0cf0e27feaad	420	* JSON string parser and creation of an MbedJSONValue
samux	0:0cf0e27feaad	421	*
samux	0:0cf0e27feaad	422	* @param out reference of an MbedJSONValue which will be filled according to the JSON string
samux	0:0cf0e27feaad	423	* @param str JSON string
samux	0:0cf0e27feaad	424	* @return A non empty string if there is a parsing error
samux	0:0cf0e27feaad	425	*
samux	0:0cf0e27feaad	426	*/
samux	0:0cf0e27feaad	427
samux	0:0cf0e27feaad	428	inline std::string parse(MbedJSONValue& out, const char * str);
samux	0:0cf0e27feaad	429	inline bool _parse(MbedJSONValue& out, input& in);
samux	0:0cf0e27feaad	430	inline bool _parse_number(MbedJSONValue& out, input& in);
samux	0:0cf0e27feaad	431	inline bool _parse_string(MbedJSONValue& out, input& in);
samux	0:0cf0e27feaad	432	inline bool _parse_array(MbedJSONValue& out, input& in);
samux	0:0cf0e27feaad	433	inline bool _parse_object(MbedJSONValue& out, input& in);
samux	0:0cf0e27feaad	434
samux	0:0cf0e27feaad	435
samux	0:0cf0e27feaad	436	inline bool _parse_string(MbedJSONValue& out, input& in) {
samux	0:0cf0e27feaad	437	#ifdef DEBUG
samux	0:0cf0e27feaad	438	printf("string detected\r\n");
samux	0:0cf0e27feaad	439	#endif
samux	0:0cf0e27feaad	440	out = MbedJSONValue(std::string(""));
samux	0:0cf0e27feaad	441	std::string& s = out.get<std::string>();
samux	0:0cf0e27feaad	442	while (1) {
samux	0:0cf0e27feaad	443	int ch = in.getc();
samux	0:0cf0e27feaad	444	if (ch < ' ') {
samux	0:0cf0e27feaad	445	in.ungetc();
samux	0:0cf0e27feaad	446	return false;
samux	0:0cf0e27feaad	447	} else if (ch == '"') {
samux	0:0cf0e27feaad	448	return true;
samux	0:0cf0e27feaad	449	} else if (ch == '\\') {
samux	0:0cf0e27feaad	450	if ((ch = in.getc()) == -1) {
samux	0:0cf0e27feaad	451	return false;
samux	0:0cf0e27feaad	452	}
samux	0:0cf0e27feaad	453	switch (ch) {
samux	0:0cf0e27feaad	454	#define MAP(sym, val) case sym: s.push_back(val); break
samux	0:0cf0e27feaad	455	MAP('"', '\"');
samux	0:0cf0e27feaad	456	MAP('\\', '\\');
samux	0:0cf0e27feaad	457	MAP('/', '/');
samux	0:0cf0e27feaad	458	MAP('b', '\b');
samux	0:0cf0e27feaad	459	MAP('f', '\f');
samux	0:0cf0e27feaad	460	MAP('n', '\n');
samux	0:0cf0e27feaad	461	MAP('r', '\r');
samux	0:0cf0e27feaad	462	MAP('t', '\t');
samux	0:0cf0e27feaad	463	#undef MAP
samux	0:0cf0e27feaad	464	default:
samux	0:0cf0e27feaad	465	return false;
samux	0:0cf0e27feaad	466	}
samux	0:0cf0e27feaad	467	} else {
samux	0:0cf0e27feaad	468	s.push_back(ch);
samux	0:0cf0e27feaad	469	}
samux	0:0cf0e27feaad	470	}
samux	0:0cf0e27feaad	471	}
samux	0:0cf0e27feaad	472
samux	0:0cf0e27feaad	473	inline bool _parse_array(MbedJSONValue& out, input& in) {
samux	0:0cf0e27feaad	474	#ifdef DEBUG
samux	0:0cf0e27feaad	475	printf("array detected\r\n");
samux	0:0cf0e27feaad	476	#endif
samux	0:0cf0e27feaad	477	int i = 0;
samux	0:0cf0e27feaad	478	if (in.expect(']')) {
samux	0:0cf0e27feaad	479	return true;
samux	0:0cf0e27feaad	480	}
samux	0:0cf0e27feaad	481	do {
samux	0:0cf0e27feaad	482	if (! _parse(out[i], in)) {
samux	0:0cf0e27feaad	483	return false;
samux	0:0cf0e27feaad	484	}
samux	0:0cf0e27feaad	485	i++;
samux	0:0cf0e27feaad	486	} while (in.expect(','));
samux	0:0cf0e27feaad	487	return in.expect(']');
samux	0:0cf0e27feaad	488	}
samux	0:0cf0e27feaad	489
samux	0:0cf0e27feaad	490	inline bool _parse_object(MbedJSONValue& out, input& in) {
samux	0:0cf0e27feaad	491	#ifdef DEBUG
samux	0:0cf0e27feaad	492	printf("object detected\r\n");
samux	0:0cf0e27feaad	493	#endif
samux	0:0cf0e27feaad	494	if (in.expect('}')) {
samux	0:0cf0e27feaad	495	return true;
samux	0:0cf0e27feaad	496	}
samux	0:0cf0e27feaad	497	do {
samux	0:0cf0e27feaad	498	MbedJSONValue key, val;
samux	0:0cf0e27feaad	499	if (in.expect('"') && _parse_string(key, in) && in.expect(':') && _parse(val, in)) {
samux	0:0cf0e27feaad	500	out[key.get<std::string>().c_str()] = val;
samux	0:0cf0e27feaad	501	#ifdef DEBUG
samux	0:0cf0e27feaad	502	printf("key: %s \r\n", key.get<std::string>().c_str());
samux	0:0cf0e27feaad	503	#endif
samux	0:0cf0e27feaad	504	} else {
samux	0:0cf0e27feaad	505	return false;
samux	0:0cf0e27feaad	506	}
samux	0:0cf0e27feaad	507	} while (in.expect(','));
samux	0:0cf0e27feaad	508	return in.expect('}');
samux	0:0cf0e27feaad	509	}
samux	0:0cf0e27feaad	510
samux	0:0cf0e27feaad	511	inline bool _parse_number(MbedJSONValue& out, input& in) {
samux	0:0cf0e27feaad	512	#ifdef DEBUG
samux	0:0cf0e27feaad	513	printf("number detected\r\n");
samux	0:0cf0e27feaad	514	#endif
samux	0:0cf0e27feaad	515	std::string num_str;
samux	0:0cf0e27feaad	516	while (1) {
samux	0:0cf0e27feaad	517	int ch = in.getc();
samux	0:0cf0e27feaad	518	if (('0' <= ch && ch <= '9') \|\| ch == '+' \|\| ch == '-' \|\| ch == '.'
samux	0:0cf0e27feaad	519	\|\| ch == 'e' \|\| ch == 'E') {
samux	0:0cf0e27feaad	520	num_str.push_back(ch);
samux	0:0cf0e27feaad	521	} else {
samux	0:0cf0e27feaad	522	in.ungetc();
samux	0:0cf0e27feaad	523	break;
samux	0:0cf0e27feaad	524	}
samux	0:0cf0e27feaad	525	}
samux	0:0cf0e27feaad	526	char* endp;
samux	0:0cf0e27feaad	527	if (strchr(num_str.c_str(), '.') != NULL \|\| strchr(num_str.c_str(), 'e') != NULL \|\| strchr(num_str.c_str(), '+') != NULL)
samux	0:0cf0e27feaad	528	out = MbedJSONValue(strtod(num_str.c_str(), &endp));
samux	0:0cf0e27feaad	529	else
samux	0:0cf0e27feaad	530	out = MbedJSONValue((int)strtod(num_str.c_str(), &endp));
samux	0:0cf0e27feaad	531	return endp == num_str.c_str() + num_str.size();
samux	0:0cf0e27feaad	532	}
samux	0:0cf0e27feaad	533
samux	0:0cf0e27feaad	534	inline bool _parse(MbedJSONValue& out, input& in) {
samux	0:0cf0e27feaad	535	in.skip_ws();
samux	0:0cf0e27feaad	536	int ch = in.getc();
samux	0:0cf0e27feaad	537	switch (ch) {
samux	0:0cf0e27feaad	538	#define IS(ch, text, val) case ch: \
samux	0:0cf0e27feaad	539	if (in.match(text)) { \
samux	0:0cf0e27feaad	540	out = val; \
samux	0:0cf0e27feaad	541	return true; \
samux	0:0cf0e27feaad	542	} else { \
samux	0:0cf0e27feaad	543	return false; \
samux	0:0cf0e27feaad	544	}
samux	0:0cf0e27feaad	545	IS('n', "ull", MbedJSONValue());
samux	0:0cf0e27feaad	546	IS('f', "alse", MbedJSONValue(false));
samux	0:0cf0e27feaad	547	IS('t', "rue", MbedJSONValue(true));
samux	0:0cf0e27feaad	548	#undef IS
samux	0:0cf0e27feaad	549	case '"':
samux	0:0cf0e27feaad	550	return _parse_string(out, in);
samux	0:0cf0e27feaad	551	case '[':
samux	0:0cf0e27feaad	552	return _parse_array(out, in);
samux	0:0cf0e27feaad	553	case '{':
samux	0:0cf0e27feaad	554	return _parse_object(out, in);
samux	0:0cf0e27feaad	555	default:
samux	0:0cf0e27feaad	556	if (('0' <= ch && ch <= '9') \|\| ch == '-') {
samux	0:0cf0e27feaad	557	in.ungetc();
samux	0:0cf0e27feaad	558	return _parse_number(out, in);
samux	0:0cf0e27feaad	559	}
samux	0:0cf0e27feaad	560	break;
samux	0:0cf0e27feaad	561	}
samux	0:0cf0e27feaad	562	in.ungetc();
samux	0:0cf0e27feaad	563	return false;
samux	0:0cf0e27feaad	564	}
samux	0:0cf0e27feaad	565
samux	0:0cf0e27feaad	566	inline std::string parse(MbedJSONValue& out, const char * pos) {
samux	0:0cf0e27feaad	567	const char * last = pos + strlen(pos);
samux	0:0cf0e27feaad	568	std::string err;
samux	0:0cf0e27feaad	569	pos = parse(out, pos, last, &err);
samux	0:0cf0e27feaad	570	return err;
samux	0:0cf0e27feaad	571	}
samux	0:0cf0e27feaad	572
samux	0:0cf0e27feaad	573	inline const char * parse(MbedJSONValue& out, const char * first, const char * last, std::string* err) {
samux	0:0cf0e27feaad	574	input in = input(first, last);
samux	0:0cf0e27feaad	575	if (! _parse(out, in) && err != NULL) {
samux	0:0cf0e27feaad	576	char buf[64];
samux	0:0cf0e27feaad	577	sprintf(buf, "syntax error at line %d near: ", in.line());
samux	0:0cf0e27feaad	578	*err = buf;
samux	0:0cf0e27feaad	579	while (1) {
samux	0:0cf0e27feaad	580	int ch = in.getc();
samux	0:0cf0e27feaad	581	if (ch == -1 \|\| ch == '\n') {
samux	0:0cf0e27feaad	582	break;
samux	0:0cf0e27feaad	583	} else if (ch >= ' ') {
samux	0:0cf0e27feaad	584	err->push_back(ch);
samux	0:0cf0e27feaad	585	}
samux	0:0cf0e27feaad	586	}
samux	0:0cf0e27feaad	587	}
samux	0:0cf0e27feaad	588	return in.cur();
samux	0:0cf0e27feaad	589	}
samux	0:0cf0e27feaad	590
samux	0:0cf0e27feaad	591	#endif // _MbedMbedJSONValue_H_

Repository toolbox

Export to desktop IDE

Repository details

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

MbedJSONValue.h@4:10a99cdf7846, 2011-09-22 (annotated)

Who changed what in which revision?

Repository toolbox

Repository details

Important Information for this Arm website

Access Warning