/*
* Skip white space in "reader". All characters <= space are considered white
* space.
* Also tops up readahead when needed.
*/
static void
json_skip_white(js_read_T *reader)
{
int c;
for (;;)
{
c = reader->js_buf[reader->js_used];
if (reader->js_fill != NULL && c == NUL)
{
if (reader->js_fill(reader))
reader->js_end = reader->js_buf + STRLEN(reader->js_buf);
continue;
}
if (c == NUL || c > ' ')
break;
++reader->js_used;
}
fill_numbuflen(reader);
}
/*
* Decode one item and put it in "res". If "res" is NULL only advance.
* Must already have skipped white space.
*
* Return FAIL for a decoding error (and give an error).
* Return MAYBE for an incomplete message.
*/
static int
json_decode_item(js_read_T *reader, typval_T *res, int options)
{
char_u *p;
int len;
int retval;
garray_T stack;
typval_T item;
typval_T *cur_item;
json_dec_item_T *top_item;
char_u key_buf[NUMBUFLEN];
ga_init2(&stack, sizeof(json_dec_item_T), 100);
cur_item = res;
init_tv(&item);
if (res != NULL)
init_tv(res);
fill_numbuflen(reader);
p = reader->js_buf + reader->js_used;
for (;;)
{
top_item = NULL;
if (stack.ga_len > 0)
{
top_item = ((json_dec_item_T *)stack.ga_data) + stack.ga_len - 1;
json_skip_white(reader);
p = reader->js_buf + reader->js_used;
if (*p == NUL)
{
retval = MAYBE;
if (top_item->jd_type == JSON_OBJECT)
/* did get the key, clear it */
clear_tv(&top_item->jd_key_tv);
goto theend;
}
if (top_item->jd_type == JSON_OBJECT_KEY
|| top_item->jd_type == JSON_ARRAY)
{
/* Check for end of object or array. */
if (*p == (top_item->jd_type == JSON_ARRAY ? ']' : '}'))
{
++reader->js_used; /* consume the ']' or '}' */
--stack.ga_len;
if (stack.ga_len == 0)
{
retval = OK;
goto theend;
}
if (cur_item != NULL)
cur_item = &top_item->jd_tv;
goto item_end;
}
}
}
if (top_item != NULL && top_item->jd_type == JSON_OBJECT_KEY
&& (options & JSON_JS)
&& reader->js_buf[reader->js_used] != '"'
&& reader->js_buf[reader->js_used] != '\''
&& reader->js_buf[reader->js_used] != '['
&& reader->js_buf[reader->js_used] != '{')
{
char_u *key;
/* accept an object key that is not in quotes */
key = p = reader->js_buf + reader->js_used;
while (*p != NUL && *p != ':' && *p > ' ')
++p;
if (cur_item != NULL)
{
cur_item->v_type = VAR_STRING;
cur_item->vval.v_string = vim_strnsave(key, (int)(p - key));
top_item->jd_key = cur_item->vval.v_string;
}
reader->js_used += (int)(p - key);
}
else
{
switch (*p)
{
case '[': /* start of array */
if (top_item && top_item->jd_type == JSON_OBJECT_KEY)
{
retval = FAIL;
break;
}
if (ga_grow(&stack, 1) == FAIL)
{
retval = FAIL;
break;
}
if (cur_item != NULL && rettv_list_alloc(cur_item) == FAIL)
{
cur_item->v_type = VAR_SPECIAL;
cur_item->vval.v_number = VVAL_NONE;
retval = FAIL;
break;
}
++reader->js_used; /* consume the '[' */
top_item = ((json_dec_item_T *)stack.ga_data)
+ stack.ga_len;
top_item->jd_type = JSON_ARRAY;
++stack.ga_len;
if (cur_item != NULL)
{
top_item->jd_tv = *cur_item;
cur_item = &item;
}
continue;
case '{': /* start of object */
if (top_item && top_item->jd_type == JSON_OBJECT_KEY)
{
retval = FAIL;
break;
}
if (ga_grow(&stack, 1) == FAIL)
{
retval = FAIL;
break;
}
if (cur_item != NULL && rettv_dict_alloc(cur_item) == FAIL)
{
cur_item->v_type = VAR_SPECIAL;
cur_item->vval.v_number = VVAL_NONE;
retval = FAIL;
break;
}
++reader->js_used; /* consume the '{' */
top_item = ((json_dec_item_T *)stack.ga_data)
+ stack.ga_len;
top_item->jd_type = JSON_OBJECT_KEY;
++stack.ga_len;
if (cur_item != NULL)
{
top_item->jd_tv = *cur_item;
cur_item = &top_item->jd_key_tv;
}
continue;
case '"': /* string */
retval = json_decode_string(reader, cur_item, *p);
break;
case '\'':
if (options & JSON_JS)
retval = json_decode_string(reader, cur_item, *p);
else
{
EMSG(_(e_invarg));
retval = FAIL;
}
break;
case ',': /* comma: empty item */
if ((options & JSON_JS) == 0)
{
EMSG(_(e_invarg));
retval = FAIL;
break;
}
/* FALLTHROUGH */
case NUL: /* empty */
if (cur_item != NULL)
{
cur_item->v_type = VAR_SPECIAL;
cur_item->vval.v_number = VVAL_NONE;
}
retval = OK;
break;
default:
if (VIM_ISDIGIT(*p) || *p == '-')
{
#ifdef FEAT_FLOAT
char_u *sp = p;
if (*sp == '-')
{
++sp;
if (*sp == NUL)
{
retval = MAYBE;
break;
}
if (!VIM_ISDIGIT(*sp))
{
EMSG(_(e_invarg));
retval = FAIL;
break;
}
}
sp = skipdigits(sp);
if (*sp == '.' || *sp == 'e' || *sp == 'E')
{
if (cur_item == NULL)
{
float_T f;
len = string2float(p, &f);
}
else
{
cur_item->v_type = VAR_FLOAT;
len = string2float(p, &cur_item->vval.v_float);
}
}
else
#endif
{
varnumber_T nr;
vim_str2nr(reader->js_buf + reader->js_used,
NULL, &len, 0, /* what */
&nr, NULL, 0);
if (cur_item != NULL)
{
cur_item->v_type = VAR_NUMBER;
cur_item->vval.v_number = nr;
}
}
reader->js_used += len;
retval = OK;
break;
}
if (STRNICMP((char *)p, "false", 5) == 0)
{
reader->js_used += 5;
if (cur_item != NULL)
{
cur_item->v_type = VAR_SPECIAL;
cur_item->vval.v_number = VVAL_FALSE;
}
retval = OK;
break;
}
if (STRNICMP((char *)p, "true", 4) == 0)
{
reader->js_used += 4;
if (cur_item != NULL)
{
cur_item->v_type = VAR_SPECIAL;
cur_item->vval.v_number = VVAL_TRUE;
}
retval = OK;
break;
}
if (STRNICMP((char *)p, "null", 4) == 0)
{
reader->js_used += 4;
if (cur_item != NULL)
{
cur_item->v_type = VAR_SPECIAL;
cur_item->vval.v_number = VVAL_NULL;
}
retval = OK;
break;
}
#ifdef FEAT_FLOAT
if (STRNICMP((char *)p, "NaN", 3) == 0)
{
reader->js_used += 3;
if (cur_item != NULL)
{
cur_item->v_type = VAR_FLOAT;
cur_item->vval.v_float = NAN;
}
retval = OK;
break;
}
if (STRNICMP((char *)p, "Infinity", 8) == 0)
{
reader->js_used += 8;
if (cur_item != NULL)
{
cur_item->v_type = VAR_FLOAT;
cur_item->vval.v_float = INFINITY;
}
retval = OK;
break;
}
#endif
/* check for truncated name */
len = (int)(reader->js_end - (reader->js_buf + reader->js_used));
if (
(len < 5 && STRNICMP((char *)p, "false", len) == 0)
#ifdef FEAT_FLOAT
|| (len < 8 && STRNICMP((char *)p, "Infinity", len) == 0)
|| (len < 3 && STRNICMP((char *)p, "NaN", len) == 0)
#endif
|| (len < 4 && (STRNICMP((char *)p, "true", len) == 0
|| STRNICMP((char *)p, "null", len) == 0)))
retval = MAYBE;
else
retval = FAIL;
break;
}
/* We are finished when retval is FAIL or MAYBE and when at the
* toplevel. */
if (retval == FAIL)
break;
if (retval == MAYBE || stack.ga_len == 0)
goto theend;
if (top_item != NULL && top_item->jd_type == JSON_OBJECT_KEY
&& cur_item != NULL)
{
top_item->jd_key = get_tv_string_buf_chk(cur_item, key_buf);
if (top_item->jd_key == NULL)
{
clear_tv(cur_item);
EMSG(_(e_invarg));
retval = FAIL;
goto theend;
}
}
}
item_end:
top_item = ((json_dec_item_T *)stack.ga_data) + stack.ga_len - 1;
switch (top_item->jd_type)
{
case JSON_ARRAY:
if (res != NULL)
{
listitem_T *li = listitem_alloc();
if (li == NULL)
{
clear_tv(cur_item);
retval = FAIL;
goto theend;
}
li->li_tv = *cur_item;
list_append(top_item->jd_tv.vval.v_list, li);
}
if (cur_item != NULL)
cur_item = &item;
json_skip_white(reader);
p = reader->js_buf + reader->js_used;
if (*p == ',')
++reader->js_used;
else if (*p != ']')
{
if (*p == NUL)
retval = MAYBE;
else
{
EMSG(_(e_invarg));
retval = FAIL;
}
goto theend;
}
break;
case JSON_OBJECT_KEY:
json_skip_white(reader);
p = reader->js_buf + reader->js_used;
if (*p != ':')
{
if (cur_item != NULL)
clear_tv(cur_item);
if (*p == NUL)
retval = MAYBE;
else
{
EMSG(_(e_invarg));
retval = FAIL;
}
goto theend;
}
++reader->js_used;
json_skip_white(reader);
top_item->jd_type = JSON_OBJECT;
if (cur_item != NULL)
cur_item = &item;
break;
case JSON_OBJECT:
if (cur_item != NULL
&& dict_find(top_item->jd_tv.vval.v_dict,
top_item->jd_key, -1) != NULL)
{
EMSG2(_("E938: Duplicate key in JSON: \"%s\""),
top_item->jd_key);
clear_tv(&top_item->jd_key_tv);
clear_tv(cur_item);
retval = FAIL;
goto theend;
}
if (cur_item != NULL)
{
dictitem_T *di = dictitem_alloc(top_item->jd_key);
clear_tv(&top_item->jd_key_tv);
if (di == NULL)
{
clear_tv(cur_item);
retval = FAIL;
goto theend;
}
di->di_tv = *cur_item;
di->di_tv.v_lock = 0;
if (dict_add(top_item->jd_tv.vval.v_dict, di) == FAIL)
{
dictitem_free(di);
retval = FAIL;
goto theend;
}
}
json_skip_white(reader);
p = reader->js_buf + reader->js_used;
if (*p == ',')
++reader->js_used;
else if (*p != '}')
{
if (*p == NUL)
retval = MAYBE;
else
{
EMSG(_(e_invarg));
retval = FAIL;
}
goto theend;
}
top_item->jd_type = JSON_OBJECT_KEY;
if (cur_item != NULL)
cur_item = &top_item->jd_key_tv;
break;
}
}
/* Get here when parsing failed. */
if (res != NULL)
{
clear_tv(res);
res->v_type = VAR_SPECIAL;
res->vval.v_number = VVAL_NONE;
}
EMSG(_(e_invarg));
theend:
ga_clear(&stack);
return retval;
}
/*
* Decode one item and put it in "res". If "res" is NULL only advance.
* Must already have skipped white space.
*
* Return FAIL for a decoding error.
* Return MAYBE for an incomplete message.
*/
static int
json_decode_item(js_read_T *reader, typval_T *res, int options)
{
char_u *p;
int len;
fill_numbuflen(reader);
p = reader->js_buf + reader->js_used;
switch (*p)
{
case '[': /* array */
return json_decode_array(reader, res, options);
case '{': /* object */
return json_decode_object(reader, res, options);
case '"': /* string */
return json_decode_string(reader, res);
case ',': /* comma: empty item */
if ((options & JSON_JS) == 0)
return FAIL;
/* FALLTHROUGH */
case NUL: /* empty */
if (res != NULL)
{
res->v_type = VAR_SPECIAL;
res->vval.v_number = VVAL_NONE;
}
return OK;
default:
if (VIM_ISDIGIT(*p) || *p == '-')
{
char_u *sp = p;
#ifdef FEAT_FLOAT
if (*sp == '-')
{
++sp;
if (*sp == NUL)
return MAYBE;
if (!VIM_ISDIGIT(*sp))
return FAIL;
}
sp = skipdigits(sp);
if (*sp == '.' || *sp == 'e' || *sp == 'E')
{
if (res == NULL)
{
float_T f;
len = string2float(p, &f);
}
else
{
res->v_type = VAR_FLOAT;
len = string2float(p, &res->vval.v_float);
}
}
else
#endif
{
long nr;
vim_str2nr(reader->js_buf + reader->js_used,
NULL, &len, 0, /* what */
&nr, NULL, 0);
if (res != NULL)
{
res->v_type = VAR_NUMBER;
res->vval.v_number = nr;
}
}
reader->js_used += len;
return OK;
}
if (STRNICMP((char *)p, "false", 5) == 0)
{
reader->js_used += 5;
if (res != NULL)
{
res->v_type = VAR_SPECIAL;
res->vval.v_number = VVAL_FALSE;
}
return OK;
}
if (STRNICMP((char *)p, "true", 4) == 0)
{
reader->js_used += 4;
if (res != NULL)
{
res->v_type = VAR_SPECIAL;
res->vval.v_number = VVAL_TRUE;
}
return OK;
}
if (STRNICMP((char *)p, "null", 4) == 0)
{
reader->js_used += 4;
if (res != NULL)
{
res->v_type = VAR_SPECIAL;
res->vval.v_number = VVAL_NULL;
}
return OK;
}
/* check for truncated name */
len = (int)(reader->js_end - (reader->js_buf + reader->js_used));
if ((len < 5 && STRNICMP((char *)p, "false", len) == 0)
|| (len < 4 && (STRNICMP((char *)p, "true", len) == 0
|| STRNICMP((char *)p, "null", len) == 0)))
return MAYBE;
break;
}
if (res != NUL)
{
res->v_type = VAR_SPECIAL;
res->vval.v_number = VVAL_NONE;
}
return FAIL;
}
