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/*
* Copyright 2007-2009, Lloyd Hilaiel.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. Neither the name of Lloyd Hilaiel nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "api/yajl_gen.h"
#include "yajl_buf.h"
#include "yajl_encode.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
typedef enum {
yajl_gen_start,
yajl_gen_map_start,
yajl_gen_map_key,
yajl_gen_map_val,
yajl_gen_array_start,
yajl_gen_in_array,
yajl_gen_complete,
yajl_gen_error
} yajl_gen_state;
struct yajl_gen_t
{
unsigned int depth;
unsigned int pretty;
const char * indentString;
yajl_gen_state state[YAJL_MAX_DEPTH];
yajl_buf buf;
/* memory allocation routines */
yajl_alloc_funcs alloc;
};
yajl_gen
yajl_gen_alloc(const yajl_gen_config * config,
const yajl_alloc_funcs * afs)
{
yajl_gen g = NULL;
yajl_alloc_funcs afsBuffer;
/* first order of business is to set up memory allocation routines */
if (afs != NULL) {
if (afs->malloc == NULL || afs->realloc == NULL || afs->free == NULL)
{
return NULL;
}
} else {
yajl_set_default_alloc_funcs(&afsBuffer);
afs = &afsBuffer;
}
g = (yajl_gen) YA_MALLOC(afs, sizeof(struct yajl_gen_t));
memset((void *) g, 0, sizeof(struct yajl_gen_t));
/* copy in pointers to allocation routines */
memcpy((void *) &(g->alloc), (void *) afs, sizeof(yajl_alloc_funcs));
if (config) {
g->pretty = config->beautify;
g->indentString = config->indentString ? config->indentString : " ";
}
g->buf = yajl_buf_alloc(&(g->alloc));
return g;
}
void
yajl_gen_free(yajl_gen g)
{
yajl_buf_free(g->buf);
YA_FREE(&(g->alloc), g);
}
#define INSERT_SEP \
if (g->state[g->depth] == yajl_gen_map_key || \
g->state[g->depth] == yajl_gen_in_array) { \
yajl_buf_append(g->buf, ",", 1); \
if (g->pretty) yajl_buf_append(g->buf, "\n", 1); \
} else if (g->state[g->depth] == yajl_gen_map_val) { \
yajl_buf_append(g->buf, ":", 1); \
if (g->pretty) yajl_buf_append(g->buf, " ", 1); \
}
#define INSERT_WHITESPACE \
if (g->pretty) { \
if (g->state[g->depth] != yajl_gen_map_val) { \
unsigned int _i; \
for (_i=0;_i<g->depth;_i++) \
yajl_buf_append(g->buf, g->indentString, \
strlen(g->indentString)); \
} \
}
#define ENSURE_NOT_KEY \
if (g->state[g->depth] == yajl_gen_map_key) { \
return yajl_gen_keys_must_be_strings; \
} \
/* check that we're not complete, or in error state. in a valid state
* to be generating */
#define ENSURE_VALID_STATE \
if (g->state[g->depth] == yajl_gen_error) { \
return yajl_gen_in_error_state;\
} else if (g->state[g->depth] == yajl_gen_complete) { \
return yajl_gen_generation_complete; \
}
#define INCREMENT_DEPTH \
if (++(g->depth) >= YAJL_MAX_DEPTH) return yajl_max_depth_exceeded;
#define APPENDED_ATOM \
switch (g->state[g->depth]) { \
case yajl_gen_start: \
g->state[g->depth] = yajl_gen_complete; \
break; \
case yajl_gen_map_start: \
case yajl_gen_map_key: \
g->state[g->depth] = yajl_gen_map_val; \
break; \
case yajl_gen_array_start: \
g->state[g->depth] = yajl_gen_in_array; \
break; \
case yajl_gen_map_val: \
g->state[g->depth] = yajl_gen_map_key; \
break; \
default: \
break; \
} \
#define FINAL_NEWLINE \
if (g->pretty && g->state[g->depth] == yajl_gen_complete) \
yajl_buf_append(g->buf, "\n", 1);
yajl_gen_status
yajl_gen_integer(yajl_gen g, long int number)
{
char i[32];
ENSURE_VALID_STATE; ENSURE_NOT_KEY; INSERT_SEP; INSERT_WHITESPACE;
sprintf(i, "%ld", number);
yajl_buf_append(g->buf, i, strlen(i));
APPENDED_ATOM;
FINAL_NEWLINE;
return yajl_gen_status_ok;
}
yajl_gen_status
yajl_gen_double(yajl_gen g, double number)
{
char i[32];
ENSURE_VALID_STATE; ENSURE_NOT_KEY; INSERT_SEP; INSERT_WHITESPACE;
sprintf(i, "%g", number);
yajl_buf_append(g->buf, i, strlen(i));
APPENDED_ATOM;
FINAL_NEWLINE;
return yajl_gen_status_ok;
}
yajl_gen_status
yajl_gen_number(yajl_gen g, const char * s, unsigned int l)
{
ENSURE_VALID_STATE; ENSURE_NOT_KEY; INSERT_SEP; INSERT_WHITESPACE;
yajl_buf_append(g->buf, s, l);
APPENDED_ATOM;
FINAL_NEWLINE;
return yajl_gen_status_ok;
}
yajl_gen_status
yajl_gen_string(yajl_gen g, const unsigned char * str,
unsigned int len)
{
ENSURE_VALID_STATE; INSERT_SEP; INSERT_WHITESPACE;
yajl_buf_append(g->buf, "\"", 1);
yajl_string_encode(g->buf, str, len);
yajl_buf_append(g->buf, "\"", 1);
APPENDED_ATOM;
FINAL_NEWLINE;
return yajl_gen_status_ok;
}
yajl_gen_status
yajl_gen_null(yajl_gen g)
{
ENSURE_VALID_STATE; ENSURE_NOT_KEY; INSERT_SEP; INSERT_WHITESPACE;
yajl_buf_append(g->buf, "null", strlen("null"));
APPENDED_ATOM;
FINAL_NEWLINE;
return yajl_gen_status_ok;
}
yajl_gen_status
yajl_gen_bool(yajl_gen g, int boolean)
{
const char * val = boolean ? "true" : "false";
ENSURE_VALID_STATE; ENSURE_NOT_KEY; INSERT_SEP; INSERT_WHITESPACE;
yajl_buf_append(g->buf, val, strlen(val));
APPENDED_ATOM;
FINAL_NEWLINE;
return yajl_gen_status_ok;
}
yajl_gen_status
yajl_gen_map_open(yajl_gen g)
{
ENSURE_VALID_STATE; ENSURE_NOT_KEY; INSERT_SEP; INSERT_WHITESPACE;
INCREMENT_DEPTH;
g->state[g->depth] = yajl_gen_map_start;
yajl_buf_append(g->buf, "{", 1);
if (g->pretty) yajl_buf_append(g->buf, "\n", 1);
FINAL_NEWLINE;
return yajl_gen_status_ok;
}
yajl_gen_status
yajl_gen_map_close(yajl_gen g)
{
ENSURE_VALID_STATE;
(g->depth)--;
if (g->pretty) yajl_buf_append(g->buf, "\n", 1);
APPENDED_ATOM;
INSERT_WHITESPACE;
yajl_buf_append(g->buf, "}", 1);
FINAL_NEWLINE;
return yajl_gen_status_ok;
}
yajl_gen_status
yajl_gen_array_open(yajl_gen g)
{
ENSURE_VALID_STATE; ENSURE_NOT_KEY; INSERT_SEP; INSERT_WHITESPACE;
INCREMENT_DEPTH;
g->state[g->depth] = yajl_gen_array_start;
yajl_buf_append(g->buf, "[", 1);
if (g->pretty) yajl_buf_append(g->buf, "\n", 1);
FINAL_NEWLINE;
return yajl_gen_status_ok;
}
yajl_gen_status
yajl_gen_array_close(yajl_gen g)
{
ENSURE_VALID_STATE;
if (g->pretty) yajl_buf_append(g->buf, "\n", 1);
(g->depth)--;
APPENDED_ATOM;
INSERT_WHITESPACE;
yajl_buf_append(g->buf, "]", 1);
FINAL_NEWLINE;
return yajl_gen_status_ok;
}
yajl_gen_status
yajl_gen_get_buf(yajl_gen g, const unsigned char ** buf,
unsigned int * len)
{
*buf = yajl_buf_data(g->buf);
*len = yajl_buf_len(g->buf);
return yajl_gen_status_ok;
}
void
yajl_gen_clear(yajl_gen g)
{
yajl_buf_clear(g->buf);
}
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