Fossil

#   ifdef _MSC_VER
#	    ifdef JSON_PARSER_DLL_EXPORTS
#		    define JSON_PARSER_DLL_API __declspec(dllexport)
#	    else
#		    define JSON_PARSER_DLL_API __declspec(dllimport)
#       endif
#   else
#	    define JSON_PARSER_DLL_API 
#   endif
#else
#	define JSON_PARSER_DLL_API 
#endif

/* Determine the integer type use to parse non-floating point numbers */
#ifdef _WIN32
typedef __int64 JSON_int_t;
#define JSON_PARSER_INTEGER_SSCANF_TOKEN "%I64d"
#define JSON_PARSER_INTEGER_SPRINTF_TOKEN "%I64d"
#elif (__STDC_VERSION__ >= 199901L) || (HAVE_LONG_LONG == 1)
typedef long long JSON_int_t;
#define JSON_PARSER_INTEGER_SSCANF_TOKEN "%lld"
#define JSON_PARSER_INTEGER_SPRINTF_TOKEN "%lld"
#else 
typedef long JSON_int_t;
#define JSON_PARSER_INTEGER_SSCANF_TOKEN "%ld"
#define JSON_PARSER_INTEGER_SPRINTF_TOKEN "%ld"
#endif


#ifdef __cplusplus
extern "C" {
#endif 

typedef enum 
{
    JSON_E_NONE = 0,
    JSON_E_INVALID_CHAR,
    JSON_E_INVALID_KEYWORD,
    JSON_E_INVALID_ESCAPE_SEQUENCE,
    JSON_E_INVALID_UNICODE_SEQUENCE,
    JSON_E_INVALID_NUMBER,
    JSON_E_NESTING_DEPTH_REACHED,
    JSON_E_UNBALANCED_COLLECTION,
    JSON_E_EXPECTED_KEY,
    JSON_E_EXPECTED_COLON,
    JSON_E_OUT_OF_MEMORY
} JSON_error;

typedef enum 
{
    JSON_T_NONE = 0,
    JSON_T_ARRAY_BEGIN,
    JSON_T_ARRAY_END,
    JSON_T_OBJECT_BEGIN,
    JSON_T_OBJECT_END,
    JSON_T_INTEGER,
    JSON_T_FLOAT,
    JSON_T_NULL,
    JSON_T_TRUE,
    JSON_T_FALSE,
    JSON_T_STRING,
    JSON_T_KEY,
    JSON_T_MAX
} JSON_type;

typedef struct JSON_value_struct {
    union {
        JSON_int_t integer_value;
        
        double float_value;
        
        struct {
            const char* value;
            size_t length;
        } str;
    } vu;
} JSON_value;

typedef struct JSON_parser_struct* JSON_parser;

/*! \brief JSON parser callback 

    \param ctx The pointer passed to new_JSON_parser.
    \param type An element of JSON_type but not JSON_T_NONE.    
    \param value A representation of the parsed value. This parameter is NULL for
        JSON_T_ARRAY_BEGIN, JSON_T_ARRAY_END, JSON_T_OBJECT_BEGIN, JSON_T_OBJECT_END,
        JSON_T_NULL, JSON_T_TRUE, and JSON_T_FALSE. String values are always returned
        as zero-terminated C strings.

    \return Non-zero if parsing should continue, else zero.
*/    
typedef int (*JSON_parser_callback)(void* ctx, int type, const JSON_value* value);


/**
   A typedef for allocator functions semantically compatible with malloc().
*/
typedef void* (*JSON_malloc_t)(size_t n);
/**
   A typedef for deallocator functions semantically compatible with free().
*/
typedef void (*JSON_free_t)(void* mem);

/*! \brief The structure used to configure a JSON parser object 
*/
typedef struct {
    /** Pointer to a callback, called when the parser has something to tell
        the user. This parameter may be NULL. In this case the input is
        merely checked for validity.
    */
    JSON_parser_callback    callback;

    - no comments
    - Uses realloc() for memory de/allocation.

    \param config. Used to configure the parser.
*/
JSON_PARSER_DLL_API void init_JSON_config(JSON_config * config);

/*! \brief Create a JSON parser object 

    \param config. Used to configure the parser. Set to NULL to use
        the default configuration. See init_JSON_config.  Its contents are
        copied by this function, so it need not outlive the returned
        object.
    
    \return The parser object, which is owned by the caller and must eventually
    be freed by calling delete_JSON_parser().
*/
JSON_PARSER_DLL_API JSON_parser new_JSON_parser(JSON_config const* config);

/*! \brief Destroy a previously created JSON parser object. */
JSON_PARSER_DLL_API void delete_JSON_parser(JSON_parser jc);

/*! \brief Parse a character.

    \return Non-zero, if all characters passed to this function are part of are valid JSON.
*/
JSON_PARSER_DLL_API int JSON_parser_char(JSON_parser jc, int next_char);

/*! \brief Finalize parsing.

    Call this method once after all input characters have been consumed.
    
    \return Non-zero, if all parsed characters are valid JSON, zero otherwise.
*/
JSON_PARSER_DLL_API int JSON_parser_done(JSON_parser jc);

/*! \brief Determine if a given string is valid JSON white space 

    \return Non-zero if the string is valid, zero otherwise.
*/
JSON_PARSER_DLL_API int JSON_parser_is_legal_white_space_string(const char* s);

/*! \brief Gets the last error that occurred during the use of JSON_parser.

    \return A value from the JSON_error enum.
*/
JSON_PARSER_DLL_API int JSON_parser_get_last_error(JSON_parser jc);

/*! \brief Re-sets the parser to prepare it for another parse run.

    \return True (non-zero) on success, 0 on error (e.g. !jc).
*/
JSON_PARSER_DLL_API int JSON_parser_reset(JSON_parser jc);


#ifdef __cplusplus
}
#endif 
    

#endif /* JSON_PARSER_H */
/* end file parser/JSON_parser.h */
/* begin file parser/JSON_parser.c */
/*
Copyright (c) 2007-2013 Jean Gressmann (jean@0x42.de)

#endif

#if defined(__cplusplus)
extern "C" {
#endif


    
/**
   This type holds the "vtbl" for type-specific operations when
   working with cson_value objects.

   All cson_values of a given logical type share a pointer to a single
   library-internal instance of this class.
*/

   Assumes V is a (cson_value*) ans V->value is a (T*). Returns
   V->value cast to a (T*).
*/
#define CSON_CAST(T,V) ((T*)((V)->value))
/**
   Assumes V is a pointer to memory which is allocated as part of a
   cson_value instance (the bytes immediately after that part).
   Returns a pointer a a cson_value by subtracting sizeof(cson_value)
   from that address and casting it to a (cson_value*)
*/
#define CSON_VCAST(V) ((cson_value *)(((unsigned char *)(V))-sizeof(cson_value)))

/**
   CSON_INT(V) assumes that V is a (cson_value*) of type
   CSON_TYPE_INTEGER. This macro returns a (cson_int_t*) representing

#define CSON_DBL(V) CSON_CAST(cson_double_t,(V))
#define CSON_STR(V) CSON_CAST(cson_string,(V))
#define CSON_OBJ(V) CSON_CAST(cson_object,(V))
#define CSON_ARRAY(V) CSON_CAST(cson_array,(V))

/**
 Holds special shared "constant" (though they are non-const)
 values. 
*/
static struct CSON_EMPTY_HOLDER_
{
    char trueValue;
    cson_string stringValue;
} CSON_EMPTY_HOLDER = {
    1/*trueValue*/,
    cson_string_empty_m
};

/**
    Indexes into the CSON_SPECIAL_VALUES array.
    
    If this enum changes in any way,
    makes damned sure that CSON_SPECIAL_VALUES is updated
    to match!!!
*/
enum CSON_INTERNAL_VALUES {
    
    CSON_VAL_UNDEF = 0,
    CSON_VAL_NULL = 1,
    CSON_VAL_TRUE = 2,
    CSON_VAL_FALSE = 3,
    CSON_VAL_INT_0 = 4,
    CSON_VAL_DBL_0 = 5,
    CSON_VAL_STR_EMPTY = 6,
    CSON_INTERNAL_VALUES_LENGTH
};

/**
  Some "special" shared cson_value instances.

  These values MUST be initialized in the order specified
  by the CSON_INTERNAL_VALUES enum.
   
  Note that they are not const because they are used as
  shared-allocation objects in non-const contexts. However, the
  public API provides no way to modifying them, and clients who
  modify values directly are subject to The Wrath of Undefined
  Behaviour.
*/
static cson_value CSON_SPECIAL_VALUES[] = {

};


/**
    Returns non-0 (true) if m is one of our special
    "built-in" values, e.g. from CSON_SPECIAL_VALUES and some
    "empty" values.
     
    If this returns true, m MUST NOT be free()d!
 */
static char cson_value_is_builtin( void const * m )
{
    if((m >= (void const *)&CSON_EMPTY_HOLDER)
        && ( m < (void const *)(&CSON_EMPTY_HOLDER+1)))
        return 1;

                                int (*visitor)(cson_kvp * obj, void * visitorState ),
                                void * visitorState );
static int cson_value_list_visit( cson_value_list * self,
                                  int (*visitor)(cson_value * obj, void * visitorState ),
                                  void * visitorState );
#endif
#endif
    
#if 0
#  define LIST_T cson_value_list
#  define VALUE_T cson_value *
#  define VALUE_T_IS_PTR 1
#  define LIST_T cson_kvp_list
#  define VALUE_T cson_kvp *
#  define VALUE_T_IS_PTR 1

cson_value * cson_value_new_object()
{
    return cson_value_object_alloc();
}

cson_object * cson_new_object()
{
    
    return cson_value_get_object( cson_value_new_object() );
}

cson_value * cson_value_new_array()
{
    return cson_value_array_alloc();
}

    if( ! val || !val->api ) return cson_rc.ArgError;
    else
    {
        cson_int_t i = 0;
        int rc = 0;
        switch(val->api->typeID)
        {
            case CSON_TYPE_UNDEF: 
            case CSON_TYPE_NULL:
              i = 0;
              break;
            case CSON_TYPE_BOOL: {
              char b = 0;
              cson_value_fetch_bool( val, &b );
              i = b;

    if( ! val || !val->api ) return cson_rc.ArgError;
    else
    {
        cson_double_t d = 0.0;
        int rc = 0;
        switch(val->api->typeID)
        {
          case CSON_TYPE_UNDEF: 
          case CSON_TYPE_NULL:
              d = 0;
              break;
          case CSON_TYPE_BOOL: {
              char b = 0;
              cson_value_fetch_bool( val, &b );
              d = b ? 1.0 : 0.0;

}

#if 0
/**
   Removes and returns the last value from the given array,
   shrinking its size by 1. Returns NULL if ar is NULL,
   ar->list.count is 0, or the element at that index is NULL.
   

   If removeRef is true then cson_value_free() is called to remove
   ar's reference count for the value. In that case NULL is returned,
   even if the object still has live references. If removeRef is false
   then the caller takes over ownership of that reference count point.

   If removeRef is false then the caller takes over ownership

    {
        cson_value * c = cson_value_new(CSON_TYPE_INTEGER,0);
#if !defined(NDEBUG) && CSON_VOID_PTR_IS_BIG
        assert( sizeof(cson_int_t) <= sizeof(void *) );
#endif
        if( c )
        {
            memcpy( CSON_INT(c), &v, sizeof(v) );
        }
        return c;
    }
}

cson_value * cson_new_double( cson_double_t v )
{
    return cson_value_new_double(v);
}

cson_value * cson_value_new_double( cson_double_t v )
{
    if( 0.0 == v ) return &CSON_SPECIAL_VALUES[CSON_VAL_DBL_0];
    else
    {
        cson_value * c = cson_value_new(CSON_TYPE_DOUBLE,0);
        if( c )
        {
            memcpy( CSON_DBL(c), &v, sizeof(v) );
        }
        return c;
    }
}

cson_string * cson_new_string(char const * str, unsigned int len)
{

    if( obj->kvp.count )
    {
        qsort( obj->kvp.list, obj->kvp.count, sizeof(cson_kvp*),
               cson_kvp_cmp );
    }

}
#endif    

int cson_object_unset( cson_object * obj, char const * key )
{
    if( ! obj || !key || !*key ) return cson_rc.ArgError;
    else
    {
        unsigned int ndx = 0;

   If p->node is-a Object then value is inserted into the object
   using p->key. In any other case cson_rc.InternalError is returned.

   Returns cson_rc.AllocError if an allocation fails.

   Returns 0 on success. On error, parsing must be ceased immediately.
   
   Ownership of val is ALWAYS TRANSFERED to this function. If this
   function fails, val will be cleaned up and destroyed. (This
   simplifies error handling in the core parser.)
*/
static int cson_parser_set_key( cson_parser * p, cson_value * val )
{
    assert( p && val );

              break;
          }
          ++p->totalKeyCount;
          break;
      }
      case JSON_T_STRING: {
          cson_value * v = cson_value_new_string( value->vu.str.value, value->vu.str.length );
          rc = ( NULL == v ) 
            ? cson_rc.AllocError
            : cson_parser_push_value( p, v );
          break;
      }
      default:
          assert(0);
          rc = cson_rc.InternalError;

   Cleans up all contents of p but does not free p.

   To properly take over ownership of the parser's root node on a
   successful parse:

   - Copy p->root's pointer and set p->root to NULL.
   - Eventually free up p->root with cson_value_free().
   
   If you do not set p->root to NULL, p->root will be freed along with
   any other items inserted into it (or under it) during the parsing
   process.
*/
static int cson_parser_clean( cson_parser * p )
{
    if( ! p ) return cson_rc.ArgError;

    unsigned char ch[2] = {0,0};
    cson_parse_opt const opt = opt_ ? *opt_ : cson_parse_opt_empty;
    int rc = 0;
    unsigned int len = 1;
    cson_parse_info info = info_ ? *info_ : cson_parse_info_empty;
    cson_parser p = cson_parser_empty;
    if( ! tgt || ! src ) return cson_rc.ArgError;
    
    {
        JSON_config jopt = {0};
        init_JSON_config( &jopt );
        jopt.allow_comments = opt.allowComments;
        jopt.depth = opt.maxDepth;
        jopt.callback_ctx = &p;
        jopt.handle_floats_manually = 0;

    {
        unsigned char const * pos = (unsigned char const *)str;
        unsigned char const * end = (unsigned char const *)(str ? (str + len) : NULL);
        unsigned char const * next = NULL;
        int ch;
        unsigned char clen = 0;
        char escChar[3] = {'\\',0,0};
        enum { UBLen = 20 };
        char ubuf[UBLen];
        int rc = 0;
        rc = f(state, "\"", 1 );
        for( ; (pos < end) && (0 == rc); pos += clen )
        {
            ch = cson_utf8Read(pos, end, &next);
            if( 0 == ch ) break;

#else
    rc = cson_value_clone(v);
#endif
#undef TRY_SHARING
    cson_value_add_reference(rc);
    return rc;
}
    
static cson_value * cson_value_clone_array( cson_value const * orig )
{
    unsigned int i = 0;
    cson_array const * asrc = cson_value_get_array( orig );
    unsigned int alen = cson_array_length_get( asrc );
    cson_value * destV = NULL;
    cson_array * destA = NULL;

                return NULL;
            }
            cson_value_free(cl)/*remove our artificial reference */;
        }
    }
    return destV;
}
    
static cson_value * cson_value_clone_object( cson_value const * orig )
{
    cson_object const * src = cson_value_get_object( orig );
    cson_value * destV = NULL;
    cson_object * dest = NULL;
    cson_kvp const * kvp = NULL;
    cson_object_iterator iter = cson_object_iterator_empty;

              v = cson_strdup( "null", 4 );
              break;
          }
          case CSON_TYPE_STRING: {
              cson_string const * jstr = cson_value_get_string(orig);
              unsigned const int slen = cson_string_length_bytes( jstr );
              assert( NULL != jstr );
              v = cson_strdup( cson_string_cstr( jstr ), slen ); 
              break;
          }
          case CSON_TYPE_INTEGER: {
              char buf[BufSize] = {0};
              if( 0 < sprintf( v, "%"CSON_INT_T_PFMT, cson_value_get_integer(orig)) )
              {
                  v = cson_strdup( buf, strlen(buf) );

              v = cson_strdup( "null", 4 );
              break;
          }
          case CSON_TYPE_STRING: {
              cson_string const * jstr = cson_value_get_string(orig);
              unsigned const int slen = cson_string_length_bytes( jstr );
              assert( NULL != jstr );
              v = cson_strdup( cson_string_cstr( jstr ), slen ); 
              break;
          }
          case CSON_TYPE_INTEGER: {
              char buf[BufSize] = {0};
              if( 0 < sprintf( v, "%"CSON_INT_T_PFMT, cson_value_get_integer(orig)) )
              {
                  v = cson_strdup( buf, strlen(buf) );

    char const * colName = NULL;
    int i = 0;
    int rc = 0;
    int colCount = 0;
    assert(st);
    colCount = sqlite3_column_count(st);
    if( colCount <= 0 ) return NULL;
    
    aryV = cson_value_new_array();
    if( ! aryV ) return NULL;
    ary = cson_value_get_array(aryV);
    assert(ary);
    for( i = 0; (0 ==rc) && (i < colCount); ++i )
    {
        colName = sqlite3_column_name( st, i );

    error:
    cson_value_free(aryV);
    aryV = NULL;
    end:
    return aryV;
}

    
/**
    Internal impl of cson_sqlite3_stmt_to_json() when the 'fat'
    parameter is non-0.
*/
static int cson_sqlite3_stmt_to_json_fat( sqlite3_stmt * st, cson_value ** tgt )
{
#define RETURN(RC) { if(rootV) cson_value_free(rootV); return RC; }

    {
        sqlite3_stmt * st = NULL;
        int rc = sqlite3_prepare_v2( db, sql, -1, &st, NULL );
        if( 0 != rc ) return cson_rc.IOError /* FIXME: Better error code? */;
        rc = cson_sqlite3_stmt_to_json( st, tgt, fat );
        sqlite3_finalize( st );
        return rc;
    }        
}

int cson_sqlite3_bind_value( sqlite3_stmt * st, int ndx, cson_value const * v )
{
    int rc = 0;
    char convertErr = 0;
    if(!st) return cson_rc.ArgError;

typedef __int64 cson_int_t;
#define CSON_INT_T_SFMT "I64d"
#define CSON_INT_T_PFMT "I64d"
#elif (__STDC_VERSION__ >= 199901L) || (HAVE_LONG_LONG == 1)
typedef long long cson_int_t;
#define CSON_INT_T_SFMT "lld"
#define CSON_INT_T_PFMT "lld"
#else 
typedef long cson_int_t;
#define CSON_INT_T_SFMT "ld"
#define CSON_INT_T_PFMT "ld"
#endif

/** @typedef double_or_long_double cson_double_t

/**
   Convenience typedef.
*/
typedef struct cson_value cson_value;

/** @struct cson_value
   
   The core value type of this API. It is opaque to clients, and
   only the cson public API should be used for setting or
   inspecting their values.

   This class is opaque because stack-based usage can easily cause
   leaks if one does not intimately understand the underlying
   internal memory management (which sometimes changes).

   It is (as of 20110323) legal to insert a given value instance into
   multiple containers (they will share ownership using reference
   counting) as long as those insertions do not cause cycles. However,
   be very aware that such value re-use uses a reference to the
   original copy, meaning that if its value is changed once, it is
   changed everywhere. Also beware that multi-threaded write
   operations on such references leads to undefined behaviour.
   
   PLEASE read the ACHTUNGEN below...

   ACHTUNG #1:

   cson_values MUST NOT form cycles (e.g. via object or array
   entries).

   Not abiding th Holy Law Of No Cycles will lead to double-frees and
   the like (i.e. undefined behaviour, likely crashes due to infinite
   recursion or stepping on invalid (freed) pointers).

   ACHTUNG #2:
   
   ALL cson_values returned as non-const cson_value pointers from any
   public functions in the cson API are to be treated as if they are
   heap-allocated, and MUST be freed by client by doing ONE of:
   
   - Passing it to cson_value_free().
   
   - Adding it to an Object or Array, in which case the object/array
   takes over ownership. As of 20110323, a value may be inserted into
   a single container multiple times, or into multiple containers,
   in which case they all share ownership (via reference counting)
   of the original value (meaning any changes to it are visible in
   all references to it).
   
   Each call to cson_value_new_xxx() MUST eventually be followed up
   by one of those options.
   
   Some cson_value_new_XXX() implementations do not actually allocate
   memory, but this is an internal implementation detail. Client code
   MUST NOT rely on this behaviour and MUST treat each object
   returned by such a function as if it was a freshly-allocated copy
   (even if their pointer addresses are the same).
   
   ACHTUNG #3:

   Note that ACHTUNG #2 tells us that we must always free (or transfer
   ownership of) all pointers returned bycson_value_new_xxx(), but
   that two calls to (e.g.) cson_value_new_bool(1) will (or might)
   return the same address. The client must not rely on the
   "non-allocation" policy of such special cases, and must pass each

   @code
   int rc = cson_some_func(...);
   if( 0 == rc ) {...success...}
   else if( cson_rc.ArgError == rc ) { ... some argument was wrong ... }
   else if( cson_rc.AllocError == rc ) { ... allocation error ... }
   ...
   @endcode
   
   The entries named Parse_XXX are generally only returned by
   cson_parse() and friends.
*/

/** @struct cson_rc_
   See \ref cson_rc for details.
*/

     */
    unsigned int col;

    /**
       Length, in bytes.
    */
    unsigned int length;
    
    /**
       Error code of the parse run (0 for no error).
    */
    int errorCode;

    /**
       The total number of object keys successfully processed by the

struct cson_output_opt
{
    /**
       Specifies how to indent (or not) output. The values
       are:

       (0) == no extra indentation.
       
       (1) == 1 TAB character for each level.

       (>1) == that number of SPACES for each level.
    */
    unsigned char indentation;

    /**
       Maximum object/array depth to traverse. Traversing deeply can
       be indicative of cycles in the object/array tree, and this
       value is used to figure out when to abort the traversal.
    */
    unsigned short maxDepth;
    
    /**
       If true, a newline will be added to generated output,
       else not.
    */
    char addNewline;

    /**

   returns, so the implementation must copy or ignore the data, but not
   hold a copy of the src pointer.

   Must return 0 on success, non-0 on error (preferably a value from
   cson_rc).

   These functions are called relatively often during the JSON-output
   process, and should try to be fast.   
*/
typedef int (*cson_data_dest_f)( void * state, void const * src, unsigned int n );

/**
    Reads JSON-formatted string data (in ASCII, UTF8, or UTF16), using the
    src function to fetch all input. This function fetches each input character
    from the source function, which is calls like src(srcState, buffer, bufferSize),

    which contains any settings the caller wants. If it is NULL then
    default settings (the values defined in cson_parse_opt_empty) are
    used.

    The info argument may be NULL. If it is not NULL then the parser
    populates it with information which is useful in error
    reporting. Namely, it contains the line/column of parse errors.
    
    The srcState argument is ignored by this function but is passed on to src,
    so any output-destination-specific state can be stored there and accessed
    via the src callback.
    
    Non-parse error conditions include:

    - (!tgt) or !src: cson_rc.ArgError
    - cson_rc.AllocError can happen at any time during the input phase

    Here's a complete example of using a custom input source:

    cson_parse_FILE() or cson_parse_string().

    TODOs:

    - Buffer the input in larger chunks. We currently read
    byte-by-byte, but i'm too tired to write/test the looping code for
    the buffering.
    
    @see cson_parse_FILE()
    @see cson_parse_string()
*/
int cson_parse( cson_value ** tgt, cson_data_source_f src, void * srcState,
                cson_parse_opt const * opt, cson_parse_info * info );
/**
   A cson_data_source_f() implementation which requires the state argument

   cson_rc.RangeError is returned.

   The destState parameter is ignored by this function and is passed
   on to the dest function.

   Returns 0 on success. On error, any amount of output might have been
   generated before the error was triggered.
   
   Example:

   @code
   int rc = cson_output( myValue, cson_data_dest_FILE, stdout, NULL );
   // basically equivalent to: cson_output_FILE( myValue, stdout, NULL );
   // but note that cson_output_FILE() actually uses different defaults
   // for the output options.

typedef struct cson_string cson_string;

/**
   Converts the given value to a boolean, using JavaScript semantics depending
   on the concrete type of val:

   undef or null: false
   
   boolean: same
   
   integer, double: 0 or 0.0 == false, else true
   
   object, array: true

   string: length-0 string is false, else true.

   Returns 0 on success and assigns *v (if v is not NULL) to either 0 or 1.
   On error (val is NULL) then v is not modified.
*/
int cson_value_fetch_bool( cson_value const * val, char * v );

/**
   Similar to cson_value_fetch_bool(), but fetches an integer value.

   The conversion, if any, depends on the concrete type of val:

   NULL, null, undefined: *v is set to 0 and 0 is returned.
   
   string, object, array: *v is set to 0 and
   cson_rc.TypeError is returned. The error may normally be safely
   ignored, but it is provided for those wanted to know whether a direct
   conversion was possible.

   integer: *v is set to the int value and 0 is returned.
   
   double: *v is set to the value truncated to int and 0 is returned.
*/
int cson_value_fetch_integer( cson_value const * val, cson_int_t * v );

/**
   The same conversions and return values as
   cson_value_fetch_integer(), except that the roles of int/double are

   they are equivalent, or a positive number if lhs is greater-than
   rhs. It has the following rules for equivalence:

   - The maximum number of bytes compared is the lesser of rhsLen and
   the length of lhs. If the strings do not match, but compare equal
   up to the just-described comparison length, the shorter string is
   considered to be less-than the longer one.
   
   - If lhs and rhs are both NULL, or both have a length of 0 then they will
   compare equal.

   - If lhs is null/length-0 but rhs is not then lhs is considered to be less-than
   rhs.

   - If rhs is null/length-0 but lhs is not then rhs is considered to be less-than

/**
   Returns the length, in bytes, of str, or 0 if str is NULL. This is
   an O(1) operation.

   TODO: add cson_string_length_chars() (is O(N) unless we add another
   member to store the char length).
   
   @see cson_string_cstr()
*/
unsigned int cson_string_length_bytes( cson_string const * str );

/**
    Returns the number of UTF8 characters in str. This value will
    be at most as long as cson_string_length_bytes() for the

   freed before inserting the new item.

   ar is expanded, if needed, to be able to hold at least (ndx+1)
   items, and any new entries created by that expansion are empty
   (NULL values).

   On success, 0 is returned and ownership of v is transfered to ar.
  
   On error ownership of v is NOT modified, and the caller may still
   need to clean it up. For example, the following code will introduce
   a leak if this function fails:

   @code
   cson_array_append( myArray, cson_value_new_integer(42) );
   @endcode

   v to ar. On error, ownership of v is not modified. Ownership of ar
   is never changed by this function.

   This is functionally equivalent to
   cson_array_set(ar,cson_array_length_get(ar),v), but this
   implementation has slightly different array-preallocation policy
   (it grows more eagerly).
   
   Returns 0 on success, non-zero on error. Error cases include:

   - ar or v are NULL: cson_rc.ArgError

   - Array cannot be expanded to hold enough elements: cson_rc.AllocError.

   - Appending would cause a numeric overlow in the array's size:

   Alias for cson_value_new_bool(v).
*/
cson_value * cson_new_bool(char v);

/**
   Returns the special JSON "null" value. When outputing JSON,
   its string representation is "null" (without the quotes).
   
   See cson_value_new_bool() for notes regarding the returned
   value's memory.
*/
cson_value * cson_value_null();

/**
   Equivalent to cson_value_new_bool(1).

*/
cson_value * cson_new_double(cson_double_t v);

/**
   Semantically the same as cson_value_new_bool(), but for strings.
   This creates a JSON value which copies the first n bytes of str.
   The string will automatically be NUL-terminated.
   
   Note that if str is NULL or n is 0, this function still
   returns non-NULL value representing that empty string.
   
   Returns NULL on allocation error.
   
   See cson_value_new_bool() for important information about the
   returned memory.
*/
cson_value * cson_value_new_string( char const * str, unsigned int n );

/**
   Allocates a new "object" value and transfers ownership of it to the

/**
   This works like cson_value_new_object() but returns an Object
   handle directly.

   The value handle for the returned object can be fetched with
   cson_object_value(theObject).
   
   Ownership is transfered to the caller, who must eventually free it
   by passing the Value handle (NOT the Object handle) to
   cson_value_free() or passing ownership to a parent container.

   Returns NULL on error (out of memory).
*/
cson_object * cson_new_object();

   value if its reference count drops to 0. Reference counts are
   increased by either inserting the value into a container or via
   cson_value_add_reference(). Even if this function does not
   immediately destroy the value, the value must be considered, from
   the perspective of that client code, to have been
   destroyed/invalidated by this call.

   
   @see cson_value_new_object()
   @see cson_value_new_array()
   @see cson_value_add_reference()
*/
void cson_value_free(cson_value * v);

/**

   cson_object_unset(obj,key). Note that (v==NULL) is treated
   differently from v having the special null value. In the latter
   case, the key is set to the special null value.

   The key may be encoded as ASCII or UTF8. Results are undefined
   with other encodings, and the errors won't show up here, but may
   show up later, e.g. during output.
   
   Returns 0 on success, non-0 on error. It has the following error
   cases:

   - cson_rc.ArgError: obj or key are NULL or strlen(key) is 0.

   - cson_rc.AllocError: an out-of-memory error

   increased refcounts unless they are replacing themselves (which is
   a harmless no-op).
*/
int cson_object_set_s( cson_object * obj, cson_string * key, cson_value * v );

/**
   Removes a property from an object.
   
   If obj contains the given key, it is removed and 0 is returned. If
   it is not found, cson_rc.NotFoundError is returned (which can
   normally be ignored by client code).

   cson_rc.ArgError is returned if obj or key are NULL or key has
   a length of 0.

    and traversing its properties as the path specifies. If a given part of the
    path is not found, then this function fails with cson_rc.NotFoundError.

    If it finds the given path, it returns the value by assiging *tgt
    to it.  If tgt is NULL then this function has no side-effects but
    will return 0 if the given path is found within the object, so it can be used
    to test for existence without fetching it.
    
    Returns 0 if it finds an entry, cson_rc.NotFoundError if it finds
    no item, and any other non-zero error code on a "real" error. Errors include:

   - obj or path are NULL: cson_rc.ArgError
    
    - separator is 0, or path is an empty string or contains only
    separator characters: cson_rc.RangeError

    - There is an upper limit on how long a single path component may
    be (some "reasonable" internal size), and cson_rc.RangeError is
    returned if that length is violated.

    
    Limitations:

    - It has no way to fetch data from arrays this way. i could
    imagine, e.g., a path of "subobj.subArray.0" for
    subobj.subArray[0], or "0.3.1" for [0][3][1]. But i'm too
    lazy/tired to add this.

    Example usage:
    

    Assume we have a JSON structure which abstractly looks like:

    @code
    {"subobj":{"subsubobj":{"myValue":[1,2,3]}}}
    @endcode

    Note that because keys in JSON may legally contain a '.', the
    separator must be specified by the caller. e.g. the path
    "subobj/subsubobj/myValue" with separator='/' is equivalent the
    path "subobj.subsubobj.myValue" with separator='.'. The value of 0
    is not legal as a separator character because we cannot
    distinguish that use from the real end-of-string without requiring
    the caller to also pass in the length of the string.
   
    Multiple successive separators in the list are collapsed into a
    single separator for parsing purposes. e.g. the path "a...b...c"
    (separator='.') is equivalent to "a.b.c".

    @see cson_object_get_sub()
    @see cson_object_get_sub2()
*/

   code.

   @see cson_object_iter_init()
   @see cson_object_iter_next()
*/
struct cson_object_iterator
{
    
    /** @internal
        The underlying object.
    */
    cson_object const * obj;
    /** @internal
        Current position in the property list.
     */

       key = cson_kvp_key(kvp);
       val = cson_kvp_value(kvp);
       ...
   }
   @endcode

   There is no need to clean up an iterator, as it holds no dynamic resources.
   
   @see cson_kvp_key()
   @see cson_kvp_value()
*/
cson_kvp * cson_object_iter_next( cson_object_iterator * iter );


/**

       @code
       void * myptr = buf.mem;
       buf = cson_buffer_empty;
       @endcode

       (You might also need to store buf.used and buf.capacity,
       depending on what you want to do with the memory.)
       
       When doing so, the memory must eventually be passed to free()
       to deallocate it.
    */
    unsigned char * mem;
};
/** Convenience typedef. */
typedef struct cson_buffer cson_buffer;

   contents, and it should not be used except to free its contents.

   On error non-zero is returned. Errors include:

   - Invalid arguments: cson_rc.ArgError

   - Buffer cannot be expanded (runs out of memory): cson_rc.AllocError
   
   Example usage:

   @code
   cson_buffer buf = cson_buffer_empty;
   // optional: cson_buffer_reserve(&buf, 1024 * 10);
   int rc = cson_output_buffer( myValue, &buf, NULL );
   if( 0 != rc ) {

   {
       char * mem = (char *)buf.mem;
       buf = cson_buffer_empty;
       ...
       free(mem);
   }
   @endcode
   
   @see cson_output()
   
*/
int cson_output_buffer( cson_value const * v, cson_buffer * buf,
                        cson_output_opt const * opt );

/**
   This works identically to cson_parse_string(), but takes a
   cson_buffer object as its input.  buf->used bytes of buf->mem are

   Whether or not this function succeeds, dest still owns any memory
   pointed to by dest->mem, and the client must eventually free it by
   calling cson_buffer_reserve(dest,0).

   dest->mem might (and possibly will) be (re)allocated by this
   function, so any pointers to it held from before this call might be
   invalidated by this call.
   
   On error non-0 is returned and dest has almost certainly been
   modified but its state must be considered incomplete.

   Errors include:

   - dest or src are NULL (cson_rc.ArgError)

    @code
    void * mem = buf.mem;
    buf = cson_buffer_empty;
    @endcode

    In which case the memory must eventually be passed to free() to
    free it.    
*/
int cson_buffer_fill_from( cson_buffer * dest, cson_data_source_f src, void * state );


/**
   Increments the reference count for the given value. This is a
   low-level operation and should not normally be used by client code

   point adds a reference and simply passed the value to
   cson_value_free() when they're done. The object will be kept alive
   for other sharing points which added a reference.

   Normally any such value handles would be invalidated when the
   parent container(s) is/are cleaned up, but this function can be
   used to effectively delay the cleanup.
   
   This function, at its lowest level, increments the value's
   reference count by 1.

   To decrement the reference count, pass the value to
   cson_value_free(), after which the value must be considered, from
   the perspective of that client code, to be destroyed (though it
   will not be if there are still other live references to
   it). cson_value_free() will not _actually_ destroy the value until
   its reference count drops to 0.

   Returns 0 on success. The only error conditions are if v is NULL
   (cson_rc.ArgError) or if the reference increment would overflow
   (cson_rc.RangeError). In theory a client would get allocation
   errors long before the reference count could overflow (assuming
   those reference counts come from container insertions, as opposed
   to via this function).

   Insider notes which clients really need to know:
   
   For shared/constant value instances, such as those returned by
   cson_value_true() and cson_value_null(), this function has no side
   effects - it does not actually modify the reference count because
   (A) those instances are shared across all client code and (B) those
   objects are static and never get cleaned up. However, that is an
   implementation detail which client code should not rely on. In
   other words, if you call cson_value_add_reference() 3 times using

   eventually free the value using cson_value_free() or add it to a
   container object/array to transfer ownership to the container. The
   returned object will be of the same logical type as orig.

   ACHTUNG: if orig contains any cyclic references at any depth level
   this function will endlessly recurse. (Having _any_ cyclic
   references violates this library's requirements.)
   
   Returns NULL if orig is NULL or if cloning fails. Assuming that
   orig is in a valid state, the only "likely" error case is that an
   allocation fails while constructing the clone. In other words, if
   cloning fails due to something other than an allocation error then
   either orig is in an invalid state or there is a bug.

   When this function clones Objects or Arrays it shares any immutable

   --key : Treats key as a boolean with a true value.

   --key=VAL : Treats VAL as either a double, integer, or string.

   --key= : Treats key as a JSON null (not literal NULL) value.

   Arguments not starting with a dash are skipped.
   
   Each key/value pair is inserted into an object.  If a given key
   appears more than once then only the final entry is actually
   stored.

   argc and argv are expected to be values from main() (or similar,
   possibly adjusted to remove argv[0]).

   type depending on the field type reported by sqlite3_column_type(st,col):

   Integer, double, null, or string (TEXT and BLOB data, though not
   all blob data is legal for a JSON string).

   st must be a sqlite3_step()'d row and col must be a 0-based column
   index within that result row.
 */       
cson_value * cson_sqlite3_column_to_value( sqlite3_stmt * st, int col );

/**
   Creates a JSON Array object containing the names of all columns
   of the given prepared statement handle. 
    
   Returns a new array value on success, which the caller owns. Its elements
   are in the same order as in the underlying query.

   On error NULL is returned.
    
   st is not traversed or freed by this function - only the column
   count and names are read.
*/
cson_value * cson_sqlite3_column_names( sqlite3_stmt * st );

/**
   Creates a JSON Object containing key/value pairs corresponding

   value which contains the JSON-form values of the given result
   set row.
*/
cson_value * cson_sqlite3_row_to_array( sqlite3_stmt * st );
/**
    Converts the results of an sqlite3 SELECT statement to JSON,
    in the form of a cson_value object tree.
    
    st must be a prepared, but not yet traversed, SELECT query.
    tgt must be a pointer to NULL (see the example below). If
    either of those arguments are NULL, cson_rc.ArgError is returned.
    
    This walks the query results and returns a JSON object which
    has a different structure depending on the value of the 'fat'
    argument.
    
    
    If 'fat' is 0 then the structure is:
    
    @code
    {
        "columns":["colName1",..."colNameN"],
        "rows":[
            [colVal0, ... colValN],
            [colVal0, ... colValN],
            ...
        ]
    }
    @endcode
    
    In the "non-fat" format the order of the columns and row values is
    guaranteed to be the same as that of the underlying query.
    
    If 'fat' is not 0 then the structure is:
    
    @code
    {
        "columns":["colName1",..."colNameN"],
        "rows":[
            {"colName1":value1,..."colNameN":valueN},
            {"colName1":value1,..."colNameN":valueN},
            ...

    change when passed through different JSON implementations,
    depending on how they implement object key/value pairs.

    On success it returns 0 and assigns *tgt to a newly-allocated
    JSON object tree (using the above structure), which the caller owns.
    If the query returns no rows, the "rows" value will be an empty
    array, as opposed to null.
    
    On error non-0 is returned and *tgt is not modified.
    
    The error code cson_rc.IOError is used to indicate a db-level
    error, and cson_rc.TypeError is returned if sqlite3_column_count(st)
    returns 0 or less (indicating an invalid or non-SELECT statement).
    
    The JSON data types are determined by the column type as reported
    by sqlite3_column_type():
    
    SQLITE_INTEGER: integer
    
    SQLITE_FLOAT: double
    
    SQLITE_TEXT or SQLITE_BLOB: string, and this will only work if
    the data is UTF8 compatible.
    
    If the db returns a literal or SQL NULL for a value it is converted
    to a JSON null. If it somehow finds a column type it cannot handle,
    the value is also converted to a NULL in the output.

    Example
    
    @code
    cson_value * json = NULL;
    int rc = cson_sqlite3_stmt_to_json( myStatement, &json, 1 );
    if( 0 != rc ) { ... error ... }
    else {
        cson_output_FILE( json, stdout, NULL );
        cson_value_free( json );

   position (starting and ndx, though the array uses 0-based offsets).

   TODO: add Object support for named parameters.

   Returns 0 on success, non-0 on error.
 */
int cson_sqlite3_bind_value( sqlite3_stmt * st, int ndx, cson_value const * v );
    
#if defined(__cplusplus)
} /*extern "C"*/
#endif
    
#endif /* CSON_ENABLE_SQLITE3 */
#endif /* WANDERINGHORSE_NET_CSON_SQLITE3_H_INCLUDED */
/* end file include/wh/cson/cson_sqlite3.h */
#endif /* FOSSIL_ENABLE_JSON */