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yajl_tree.h
/* * Copyright (c) 2010-2011 Florian Forster <ff at octo.it> * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /** * \file yajl_tree.h * * Parses JSON data and returns the data in tree form. * * \author Florian Forster * \date August 2010 * * This interface makes quick parsing and extraction of * smallish JSON docs trivial: * * \include example/parse_config.c */ #ifndef YAJL_TREE_H #define YAJL_TREE_H 1 #include <yajl/yajl_common.h> #ifdef __cplusplus extern "C" { #endif /** possible data types that a yajl_val_s can hold */ typedef enum { yajl_t_string = 1, yajl_t_number = 2, yajl_t_object = 3, yajl_t_array = 4, yajl_t_true = 5, yajl_t_false = 6, yajl_t_null = 7, /** The any type isn't valid for yajl_val_s.type, but can be * used as an argument to routines like yajl_tree_get(). */ yajl_t_any = 8 } yajl_type; #define YAJL_NUMBER_INT_VALID 0x01 #define YAJL_NUMBER_DOUBLE_VALID 0x02 /** A pointer to a node in the parse tree */ typedef struct yajl_val_s * yajl_val; /** * A JSON value representation capable of holding one of the seven * types above. For "string", "number", "object", and "array" * additional data is available in the union. The "YAJL_IS_*" * and "YAJL_GET_*" macros below allow type checking and convenient * value extraction. */ struct yajl_val_s { /** Type of the value contained. Use the "YAJL_IS_*" macros to check for a * specific type. */ yajl_type type; /** Type-specific data. You may use the "YAJL_GET_*" macros to access these * members. */ union { char * string; struct { long long i; /*< integer value, if representable. */ double d; /*< double value, if representable. */ char *r; /*< unparsed number in string form. */ /** Signals whether the \em i and \em d members are * valid. See \c YAJL_NUMBER_INT_VALID and * \c YAJL_NUMBER_DOUBLE_VALID. */ unsigned int flags; } number; struct { const char **keys; /*< Array of keys */ yajl_val *values; /*< Array of values. */ size_t len; /*< Number of key-value-pairs. */ } object; struct { yajl_val *values; /*< Array of elements. */ size_t len; /*< Number of elements. */ } array; } u; }; /** * Parse a string. * * Parses an null-terminated string containing JSON data and returns a pointer * to the top-level value (root of the parse tree). * * \param input Pointer to a null-terminated utf8 string containing * JSON data. * \param error_buffer Pointer to a buffer in which an error message will * be stored if \em yajl_tree_parse fails, or * \c NULL. The buffer will be initialized before * parsing, so its content will be destroyed even if * \em yajl_tree_parse succeeds. * \param error_buffer_size Size of the memory area pointed to by * \em error_buffer_size. If \em error_buffer_size is * \c NULL, this argument is ignored. * * \returns Pointer to the top-level value or \c NULL on error. The memory * pointed to must be freed using \em yajl_tree_free. In case of an error, a * null terminated message describing the error in more detail is stored in * \em error_buffer if it is not \c NULL. */ YAJL_API yajl_val yajl_tree_parse (const char *input, char *error_buffer, size_t error_buffer_size); /** * Free a parse tree returned by "yajl_tree_parse". * * \param v Pointer to a JSON value returned by "yajl_tree_parse". Passing NULL * is valid and results in a no-op. */ YAJL_API void yajl_tree_free (yajl_val v); /** * Access a nested value inside a tree. * * \param parent the node under which you'd like to extract values. * \param path A null terminated array of strings, each the name of an object key * \param type the yajl_type of the object you seek, or yajl_t_any if any will do. * * \returns a pointer to the found value, or NULL if we came up empty. * * Future Ideas: it'd be nice to move path to a string and implement support for * a teeny tiny micro language here, so you can extract array elements, do things * like .first and .last, even .length. Inspiration from JSONPath and css selectors? * No it wouldn't be fast, but that's not what this API is about. */ YAJL_API yajl_val yajl_tree_get(yajl_val parent, const char ** path, yajl_type type); /* Various convenience macros to check the type of a `yajl_val` */ #define YAJL_IS_STRING(v) (((v) != NULL) && ((v)->type == yajl_t_string)) #define YAJL_IS_NUMBER(v) (((v) != NULL) && ((v)->type == yajl_t_number)) #define YAJL_IS_INTEGER(v) (YAJL_IS_NUMBER(v) && ((v)->u.number.flags & YAJL_NUMBER_INT_VALID)) #define YAJL_IS_DOUBLE(v) (YAJL_IS_NUMBER(v) && ((v)->u.number.flags & YAJL_NUMBER_DOUBLE_VALID)) #define YAJL_IS_OBJECT(v) (((v) != NULL) && ((v)->type == yajl_t_object)) #define YAJL_IS_ARRAY(v) (((v) != NULL) && ((v)->type == yajl_t_array )) #define YAJL_IS_TRUE(v) (((v) != NULL) && ((v)->type == yajl_t_true )) #define YAJL_IS_FALSE(v) (((v) != NULL) && ((v)->type == yajl_t_false )) #define YAJL_IS_NULL(v) (((v) != NULL) && ((v)->type == yajl_t_null )) /** Given a yajl_val_string return a ptr to the bare string it contains, * or NULL if the value is not a string. */ #define YAJL_GET_STRING(v) (YAJL_IS_STRING(v) ? (v)->u.string : NULL) /** Get the string representation of a number. You should check type first, * perhaps using YAJL_IS_NUMBER */ #define YAJL_GET_NUMBER(v) ((v)->u.number.r) /** Get the double representation of a number. You should check type first, * perhaps using YAJL_IS_DOUBLE */ #define YAJL_GET_DOUBLE(v) ((v)->u.number.d) /** Get the 64bit (long long) integer representation of a number. You should * check type first, perhaps using YAJL_IS_INTEGER */ #define YAJL_GET_INTEGER(v) ((v)->u.number.i) /** Get a pointer to a yajl_val_object or NULL if the value is not an object. */ #define YAJL_GET_OBJECT(v) (YAJL_IS_OBJECT(v) ? &(v)->u.object : NULL) /** Get a pointer to a yajl_val_array or NULL if the value is not an object. */ #define YAJL_GET_ARRAY(v) (YAJL_IS_ARRAY(v) ? &(v)->u.array : NULL) #ifdef __cplusplus } #endif #endif /* YAJL_TREE_H */
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