JST_load.c File Reference

#include "JST_private.h"
#include "JST_list.h"
#include "JST_string.h"
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include "jstools.h"

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Enumerations
enum	TokenType {   TOKEN_NONE, TOKEN_OPEN_OBJECT, TOKEN_COLON, TOKEN_CLOSE_OBJECT,   TOKEN_COMMA, TOKEN_OPEN_ARRAY, TOKEN_CLOSE_ARRAY, TOKEN_TRUE,   TOKEN_FALSE, TOKEN_INTEGER, TOKEN_DOUBLE, TOKEN_STRING,   TOKEN_NULL }

Functions
JST_Error	JST_load_from_stream (FILE *stream, JST_Element *root, JST_SyntaxError *syntax_error)
	Reads the input stream, allocates the node of the corresponding tree, than frees the input buffer. More...
JST_Error	JST_load_from_file (const char *path, JST_Element *root, JST_SyntaxError *syntax_error)
	Reads the input file, allocates the node of the corresponding tree, than frees the input buffer. More...

Variables
bool	JST_DEBUG_SHOW_TOKENS = false
const JST_Array	JST_Array_Zero = { .items = NULL, .count = 0U, .parent = NULL }
	Constant defined to initialize safely a variable of type JST_Array. More...
const JST_Object	JST_Object_Zero = { .items = NULL, .count = 0U, .parent = NULL, .first = NULL }
	Constant defined to initialize safely a variable of type JST_Object. More...
const JST_Value	JST_Value_Zero = { .object = JST_Object_Zero }
	Constant defined to initialize safely a variable of type JST_Value. More...
const JST_Element	JST_Element_Zero = { .type = JST_NULL, .value = JST_Value_Zero }
	Constant defined to initialize safely a variable of type JST_Element. More...
const JST_ArrayItem	JST_ArrayItem_Zero = { .parent = NULL, .element = JST_Element_Zero }
const JST_Pair	JST_Pair_Zero = { .parent = NULL, .element = JST_Element_Zero, .name = NULL, .next = NULL }
	Constant defined to initialize safely a variable of type JST_Pair. More...
const JST_SyntaxError	JST_SyntaxError_Zero = { .line = 0U, .pos = 0U }
	Constant defined to initialize safely a variable of type JST_SyntaxError. More...

Enumeration Type Documentation

TokenType

enum TokenType

Enumerator
TOKEN_NONE
TOKEN_OPEN_OBJECT
TOKEN_COLON
TOKEN_CLOSE_OBJECT
TOKEN_COMMA
TOKEN_OPEN_ARRAY
TOKEN_CLOSE_ARRAY
TOKEN_TRUE
TOKEN_FALSE
TOKEN_INTEGER
TOKEN_DOUBLE
TOKEN_STRING
TOKEN_NULL

Definition at line 24 of file JST_load.c.

             {
   TOKEN_NONE,
   TOKEN_OPEN_OBJECT,
   TOKEN_COLON,
   TOKEN_CLOSE_OBJECT,
   TOKEN_COMMA,
   TOKEN_OPEN_ARRAY,
   TOKEN_CLOSE_ARRAY,
   TOKEN_TRUE,
   TOKEN_FALSE,
   TOKEN_INTEGER,
   TOKEN_DOUBLE,
   TOKEN_STRING,
   TOKEN_NULL,
} TokenType;

Function Documentation

JST_load_from_file()

JST_Error JST_load_from_file	(	const char *	filepath,
		JST_Element *	root,
		JST_SyntaxError *	error
	)

Reads the input file, allocates the node of the corresponding tree, than frees the input buffer.

Parameters

filepath	the file path
root	the root of the JSON tree
line	the last line number read, available in case of error
context	few characters before the error, available in case of error
ditsance	the offset of the error, in context

Returns

an error status.

Definition at line 573 of file JST_load.c.

                                                                                                      {
   if(( path == NULL )) {
      return JST_ERR_NULL_ARGUMENT;
   }
   FILE * stream = fopen( path, "rt" );
   if( stream == NULL ) {
      return JST_ERR_ERRNO;
   }
   JST_Error error = JST_load_from_stream( stream, root, syntax_error );
   int myerrno = errno;
   fclose( stream );
   errno = myerrno;
   return error;
}

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JST_load_from_stream()

JST_Error JST_load_from_stream	(	FILE *	stream,
		JST_Element *	root,
		JST_SyntaxError *	error
	)

Reads the input stream, allocates the node of the corresponding tree, than frees the input buffer.

Parameters

stream	the character stream to read
root	the root of the JSON tree
line	the last line number read, available in case of error
context	few characters before the error, available in case of error
ditsance	the offset of the error, in context

Returns

an error status.

Definition at line 533 of file JST_load.c.

                                                                                                    {
   if( syntax_error ) {
      *syntax_error = JST_SyntaxError_Zero;
   }
   if(( stream == NULL )||( root == NULL )) {
      return JST_ERR_NULL_ARGUMENT;
   }
   *root = JST_Element_Zero;
   Context context = Context_Zero;
   Token   token   = Token_Zero;
   context.stream = stream;
   bool    ok      = true
      && get_next_token( &context, &token )
      && set_value( &context, root, NULL, &token )
      && remaining_chars_are_only_whitespaces( &context );
   if( ! ok ) {
      if( syntax_error ) {
         syntax_error->line = (unsigned)( 1 + context.line );
         size_t pos = (( context.pos < context.limit )||(context.limit == 0 )) ? context.pos : ( context.limit - 1 );
         while(( pos > 0 )
            && (( context.pos - pos ) < ( sizeof( syntax_error->context ) / 2 ))
            && ( context.buffer[pos] != '\r' )
            && ( context.buffer[pos] != '\n' ))
         {
            --pos;
         }
         if(( context.buffer[pos] == '\r' )||( context.buffer[pos] == '\n' )) {
            ++pos;
         }
         strncpy( syntax_error->context, context.buffer + pos, sizeof( syntax_error->context ) - 1 );
         syntax_error->context[sizeof( syntax_error->context )-1] = '\0';
         syntax_error->pos  = (unsigned)( context.pos - pos );
         if( syntax_error->pos > 0 ) {
            --(syntax_error->pos);
         }
      }
   }
   return context.error;
}

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Variable Documentation

JST_Array_Zero

const JST_Array JST_Array_Zero = { .items = NULL, .count = 0U, .parent = NULL }

Constant defined to initialize safely a variable of type JST_Array.

Definition at line 16 of file JST_load.c.

JST_ArrayItem_Zero

const JST_ArrayItem JST_ArrayItem_Zero = { .parent = NULL, .element = JST_Element_Zero }

Definition at line 20 of file JST_load.c.

JST_DEBUG_SHOW_TOKENS

bool JST_DEBUG_SHOW_TOKENS = false

Definition at line 14 of file JST_load.c.

JST_Element_Zero

const JST_Element JST_Element_Zero = { .type = JST_NULL, .value = JST_Value_Zero }

Constant defined to initialize safely a variable of type JST_Element.

Definition at line 19 of file JST_load.c.

JST_Object_Zero

const JST_Object JST_Object_Zero = { .items = NULL, .count = 0U, .parent = NULL, .first = NULL }

Constant defined to initialize safely a variable of type JST_Object.

Definition at line 17 of file JST_load.c.

JST_Pair_Zero

const JST_Pair JST_Pair_Zero = { .parent = NULL, .element = JST_Element_Zero, .name = NULL, .next = NULL }

Constant defined to initialize safely a variable of type JST_Pair.

Definition at line 21 of file JST_load.c.

JST_SyntaxError_Zero

const JST_SyntaxError JST_SyntaxError_Zero = { .line = 0U, .pos = 0U }

Constant defined to initialize safely a variable of type JST_SyntaxError.

Definition at line 22 of file JST_load.c.

JST_Value_Zero

const JST_Value JST_Value_Zero = { .object = JST_Object_Zero }

Constant defined to initialize safely a variable of type JST_Value.

Definition at line 18 of file JST_load.c.