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yajl_gen.c
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yajl_gen.c
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/*
* Copyright 2010, 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>
#include <math.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_print_t print;
void * ctx; /* yajl_buf */
/* memory allocation routines */
yajl_alloc_funcs alloc;
};
yajl_gen
yajl_gen_alloc(const yajl_gen_config * config,
const yajl_alloc_funcs * afs)
{
return yajl_gen_alloc2(NULL, config, afs, NULL);
}
yajl_gen
yajl_gen_alloc2(const yajl_print_t callback,
const yajl_gen_config * config,
const yajl_alloc_funcs * afs,
void * ctx)
{
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 : " ";
}
if (callback) {
g->print = callback;
g->ctx = ctx;
} else {
g->print = (yajl_print_t)&yajl_buf_append;
g->ctx = yajl_buf_alloc(&(g->alloc));
}
return g;
}
void
yajl_gen_free(yajl_gen g)
{
if (g->print == (yajl_print_t)&yajl_buf_append) yajl_buf_free((yajl_buf)g->ctx);
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) { \
g->print(g->ctx, ",", 1); \
if (g->pretty) g->print(g->ctx, "\n", 1); \
} else if (g->state[g->depth] == yajl_gen_map_val) { \
g->print(g->ctx, ":", 1); \
if (g->pretty) g->print(g->ctx, " ", 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++) \
g->print(g->ctx, 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) \
g->print(g->ctx, "\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);
g->print(g->ctx, i, strlen(i));
APPENDED_ATOM;
FINAL_NEWLINE;
return yajl_gen_status_ok;
}
#ifdef WIN32
#include <float.h>
#define isnan _isnan
#define isinf !_finite
#endif
yajl_gen_status
yajl_gen_double(yajl_gen g, double number)
{
char i[32];
ENSURE_VALID_STATE; ENSURE_NOT_KEY;
if (isnan(number) || isinf(number)) return yajl_gen_invalid_number;
INSERT_SEP; INSERT_WHITESPACE;
sprintf(i, "%g", number);
g->print(g->ctx, 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;
g->print(g->ctx, 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;
g->print(g->ctx, "\"", 1);
yajl_string_encode2(g->print, g->ctx, str, len);
g->print(g->ctx, "\"", 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;
g->print(g->ctx, "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;
g->print(g->ctx, 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;
g->print(g->ctx, "{", 1);
if (g->pretty) g->print(g->ctx, "\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) g->print(g->ctx, "\n", 1);
APPENDED_ATOM;
INSERT_WHITESPACE;
g->print(g->ctx, "}", 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;
g->print(g->ctx, "[", 1);
if (g->pretty) g->print(g->ctx, "\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) g->print(g->ctx, "\n", 1);
(g->depth)--;
APPENDED_ATOM;
INSERT_WHITESPACE;
g->print(g->ctx, "]", 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)
{
if (g->print != (yajl_print_t)&yajl_buf_append) return yajl_gen_no_buf;
*buf = yajl_buf_data((yajl_buf)g->ctx);
*len = yajl_buf_len((yajl_buf)g->ctx);
return yajl_gen_status_ok;
}
void
yajl_gen_clear(yajl_gen g)
{
if (g->print == (yajl_print_t)&yajl_buf_append) yajl_buf_clear((yajl_buf)g->ctx);
}