Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

504 lines (415 sloc) 13.699 kb
/*
* 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.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "api/yajl_tree.h"
#include "api/yajl_parse.h"
#include "yajl_parser.h"
#if defined(_WIN32) || defined(WIN32)
#define snprintf sprintf_s
#endif
#define STATUS_CONTINUE 1
#define STATUS_ABORT 0
struct stack_elem_s;
typedef struct stack_elem_s stack_elem_t;
struct stack_elem_s
{
char * key;
yajl_val value;
stack_elem_t *next;
};
struct context_s
{
stack_elem_t *stack;
yajl_val root;
char *errbuf;
size_t errbuf_size;
};
typedef struct context_s context_t;
#define RETURN_ERROR(ctx,retval,...) { \
if ((ctx)->errbuf != NULL) \
snprintf ((ctx)->errbuf, (ctx)->errbuf_size, __VA_ARGS__); \
return (retval); \
}
static yajl_val value_alloc (yajl_type type)
{
yajl_val v;
v = malloc (sizeof (*v));
if (v == NULL) return (NULL);
memset (v, 0, sizeof (*v));
v->type = type;
return (v);
}
static void yajl_object_free (yajl_val v)
{
size_t i;
if (!YAJL_IS_OBJECT(v)) return;
for (i = 0; i < v->u.object.len; i++)
{
free((char *) v->u.object.keys[i]);
v->u.object.keys[i] = NULL;
yajl_tree_free (v->u.object.values[i]);
v->u.object.values[i] = NULL;
}
free((void*) v->u.object.keys);
free(v->u.object.values);
free(v);
}
static void yajl_array_free (yajl_val v)
{
size_t i;
if (!YAJL_IS_ARRAY(v)) return;
for (i = 0; i < v->u.array.len; i++)
{
yajl_tree_free (v->u.array.values[i]);
v->u.array.values[i] = NULL;
}
free(v->u.array.values);
free(v);
}
/*
* Parsing nested objects and arrays is implemented using a stack. When a new
* object or array starts (a curly or a square opening bracket is read), an
* appropriate value is pushed on the stack. When the end of the object is
* reached (an appropriate closing bracket has been read), the value is popped
* off the stack and added to the enclosing object using "context_add_value".
*/
static int context_push(context_t *ctx, yajl_val v)
{
stack_elem_t *stack;
stack = malloc (sizeof (*stack));
if (stack == NULL)
RETURN_ERROR (ctx, ENOMEM, "Out of memory");
memset (stack, 0, sizeof (*stack));
assert ((ctx->stack == NULL)
|| YAJL_IS_OBJECT (v)
|| YAJL_IS_ARRAY (v));
stack->value = v;
stack->next = ctx->stack;
ctx->stack = stack;
return (0);
}
static yajl_val context_pop(context_t *ctx)
{
stack_elem_t *stack;
yajl_val v;
if (ctx->stack == NULL)
RETURN_ERROR (ctx, NULL, "context_pop: "
"Bottom of stack reached prematurely");
stack = ctx->stack;
ctx->stack = stack->next;
v = stack->value;
free (stack);
return (v);
}
static int object_add_keyval(context_t *ctx,
yajl_val obj, char *key, yajl_val value)
{
const char **tmpk;
yajl_val *tmpv;
/* We're checking for NULL in "context_add_value" or its callers. */
assert (ctx != NULL);
assert (obj != NULL);
assert (key != NULL);
assert (value != NULL);
/* We're assuring that "obj" is an object in "context_add_value". */
assert(YAJL_IS_OBJECT(obj));
tmpk = realloc((void *) obj->u.object.keys, sizeof(*(obj->u.object.keys)) * (obj->u.object.len + 1));
if (tmpk == NULL)
RETURN_ERROR(ctx, ENOMEM, "Out of memory");
obj->u.object.keys = tmpk;
tmpv = realloc(obj->u.object.values, sizeof (*obj->u.object.values) * (obj->u.object.len + 1));
if (tmpv == NULL)
RETURN_ERROR(ctx, ENOMEM, "Out of memory");
obj->u.object.values = tmpv;
obj->u.object.keys[obj->u.object.len] = key;
obj->u.object.values[obj->u.object.len] = value;
obj->u.object.len++;
return (0);
}
static int array_add_value (context_t *ctx,
yajl_val array, yajl_val value)
{
yajl_val *tmp;
/* We're checking for NULL pointers in "context_add_value" or its
* callers. */
assert (ctx != NULL);
assert (array != NULL);
assert (value != NULL);
/* "context_add_value" will only call us with array values. */
assert(YAJL_IS_ARRAY(array));
tmp = realloc(array->u.array.values,
sizeof(*(array->u.array.values)) * (array->u.array.len + 1));
if (tmp == NULL)
RETURN_ERROR(ctx, ENOMEM, "Out of memory");
array->u.array.values = tmp;
array->u.array.values[array->u.array.len] = value;
array->u.array.len++;
return 0;
}
/*
* Add a value to the value on top of the stack or the "root" member in the
* context if the end of the parsing process is reached.
*/
static int context_add_value (context_t *ctx, yajl_val v)
{
/* We're checking for NULL values in all the calling functions. */
assert (ctx != NULL);
assert (v != NULL);
/*
* There are three valid states in which this function may be called:
* - There is no value on the stack => This is the only value. This is the
* last step done when parsing a document. We assign the value to the
* "root" member and return.
* - The value on the stack is an object. In this case store the key on the
* stack or, if the key has already been read, add key and value to the
* object.
* - The value on the stack is an array. In this case simply add the value
* and return.
*/
if (ctx->stack == NULL)
{
assert (ctx->root == NULL);
ctx->root = v;
return (0);
}
else if (YAJL_IS_OBJECT (ctx->stack->value))
{
if (ctx->stack->key == NULL)
{
if (!YAJL_IS_STRING (v))
RETURN_ERROR (ctx, EINVAL, "context_add_value: "
"Object key is not a string (%#04x)",
v->type);
ctx->stack->key = v->u.string;
v->u.string = NULL;
free(v);
return (0);
}
else /* if (ctx->key != NULL) */
{
char * key;
key = ctx->stack->key;
ctx->stack->key = NULL;
return (object_add_keyval (ctx, ctx->stack->value, key, v));
}
}
else if (YAJL_IS_ARRAY (ctx->stack->value))
{
return (array_add_value (ctx, ctx->stack->value, v));
}
else
{
RETURN_ERROR (ctx, EINVAL, "context_add_value: Cannot add value to "
"a value of type %#04x (not a composite type)",
ctx->stack->value->type);
}
}
static int handle_string (void *ctx,
const unsigned char *string, size_t string_length)
{
yajl_val v;
v = value_alloc (yajl_t_string);
if (v == NULL)
RETURN_ERROR ((context_t *) ctx, STATUS_ABORT, "Out of memory");
v->u.string = malloc (string_length + 1);
if (v->u.string == NULL)
{
free (v);
RETURN_ERROR ((context_t *) ctx, STATUS_ABORT, "Out of memory");
}
memcpy(v->u.string, string, string_length);
v->u.string[string_length] = 0;
return ((context_add_value (ctx, v) == 0) ? STATUS_CONTINUE : STATUS_ABORT);
}
static int handle_number (void *ctx, const char *string, size_t string_length)
{
yajl_val v;
char *endptr;
v = value_alloc(yajl_t_number);
if (v == NULL)
RETURN_ERROR((context_t *) ctx, STATUS_ABORT, "Out of memory");
v->u.number.r = malloc(string_length + 1);
if (v->u.number.r == NULL)
{
free(v);
RETURN_ERROR((context_t *) ctx, STATUS_ABORT, "Out of memory");
}
memcpy(v->u.number.r, string, string_length);
v->u.number.r[string_length] = 0;
v->u.number.flags = 0;
errno = 0;
v->u.number.i = yajl_parse_integer((const unsigned char *) v->u.number.r,
strlen(v->u.number.r));
if (errno == 0)
v->u.number.flags |= YAJL_NUMBER_INT_VALID;
endptr = NULL;
errno = 0;
v->u.number.d = strtod(v->u.number.r, &endptr);
if ((errno == 0) && (endptr != NULL) && (*endptr == 0))
v->u.number.flags |= YAJL_NUMBER_DOUBLE_VALID;
return ((context_add_value(ctx, v) == 0) ? STATUS_CONTINUE : STATUS_ABORT);
}
static int handle_start_map (void *ctx)
{
yajl_val v;
v = value_alloc(yajl_t_object);
if (v == NULL)
RETURN_ERROR ((context_t *) ctx, STATUS_ABORT, "Out of memory");
v->u.object.keys = NULL;
v->u.object.values = NULL;
v->u.object.len = 0;
return ((context_push (ctx, v) == 0) ? STATUS_CONTINUE : STATUS_ABORT);
}
static int handle_end_map (void *ctx)
{
yajl_val v;
v = context_pop (ctx);
if (v == NULL)
return (STATUS_ABORT);
return ((context_add_value (ctx, v) == 0) ? STATUS_CONTINUE : STATUS_ABORT);
}
static int handle_start_array (void *ctx)
{
yajl_val v;
v = value_alloc(yajl_t_array);
if (v == NULL)
RETURN_ERROR ((context_t *) ctx, STATUS_ABORT, "Out of memory");
v->u.array.values = NULL;
v->u.array.len = 0;
return ((context_push (ctx, v) == 0) ? STATUS_CONTINUE : STATUS_ABORT);
}
static int handle_end_array (void *ctx)
{
yajl_val v;
v = context_pop (ctx);
if (v == NULL)
return (STATUS_ABORT);
return ((context_add_value (ctx, v) == 0) ? STATUS_CONTINUE : STATUS_ABORT);
}
static int handle_boolean (void *ctx, int boolean_value)
{
yajl_val v;
v = value_alloc (boolean_value ? yajl_t_true : yajl_t_false);
if (v == NULL)
RETURN_ERROR ((context_t *) ctx, STATUS_ABORT, "Out of memory");
return ((context_add_value (ctx, v) == 0) ? STATUS_CONTINUE : STATUS_ABORT);
}
static int handle_null (void *ctx)
{
yajl_val v;
v = value_alloc (yajl_t_null);
if (v == NULL)
RETURN_ERROR ((context_t *) ctx, STATUS_ABORT, "Out of memory");
return ((context_add_value (ctx, v) == 0) ? STATUS_CONTINUE : STATUS_ABORT);
}
/*
* Public functions
*/
yajl_val yajl_tree_parse (const char *input,
char *error_buffer, size_t error_buffer_size)
{
static const yajl_callbacks callbacks =
{
/* null = */ handle_null,
/* boolean = */ handle_boolean,
/* integer = */ NULL,
/* double = */ NULL,
/* number = */ handle_number,
/* string = */ handle_string,
/* start map = */ handle_start_map,
/* map key = */ handle_string,
/* end map = */ handle_end_map,
/* start array = */ handle_start_array,
/* end array = */ handle_end_array
};
yajl_handle handle;
yajl_status status;
char * internal_err_str;
context_t ctx = { NULL, NULL, NULL, 0 };
ctx.errbuf = error_buffer;
ctx.errbuf_size = error_buffer_size;
if (error_buffer != NULL)
memset (error_buffer, 0, error_buffer_size);
handle = yajl_alloc (&callbacks, NULL, &ctx);
yajl_config(handle, yajl_allow_comments, 1);
status = yajl_parse(handle,
(unsigned char *) input,
strlen (input));
status = yajl_complete_parse (handle);
if (status != yajl_status_ok) {
if (error_buffer != NULL && error_buffer_size > 0) {
internal_err_str = (char *) yajl_get_error(handle, 1,
(const unsigned char *) input,
strlen(input));
snprintf(error_buffer, error_buffer_size, "%s", internal_err_str);
YA_FREE(&(handle->alloc), internal_err_str);
}
yajl_free (handle);
return NULL;
}
yajl_free (handle);
return (ctx.root);
}
yajl_val yajl_tree_get(yajl_val n, const char ** path, yajl_type type)
{
if (!path) return NULL;
while (n && *path) {
size_t i;
size_t len;
if (n->type != yajl_t_object) return NULL;
len = n->u.object.len;
for (i = 0; i < len; i++) {
if (!strcmp(*path, n->u.object.keys[i])) {
n = n->u.object.values[i];
break;
}
}
if (i == len) return NULL;
path++;
}
if (n && type != yajl_t_any && type != n->type) n = NULL;
return n;
}
void yajl_tree_free (yajl_val v)
{
if (v == NULL) return;
if (YAJL_IS_STRING(v))
{
free(v->u.string);
free(v);
}
else if (YAJL_IS_NUMBER(v))
{
free(v->u.number.r);
free(v);
}
else if (YAJL_GET_OBJECT(v))
{
yajl_object_free(v);
}
else if (YAJL_GET_ARRAY(v))
{
yajl_array_free(v);
}
else /* if (yajl_t_true or yajl_t_false or yajl_t_null) */
{
free(v);
}
}
Jump to Line
Something went wrong with that request. Please try again.