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vim/src/json.c
Yegappan Lakshmanan ec3cebbd2b
patch 9.0.2076: Vim9: No support for type aliases 
Problem:  Vim9: No support for type aliases
Solution: Implement :type command

A type definition is giving a name to a type specification.  This also known
type alias.

	:type ListOfStrings = list<string>

The type alias can be used wherever a built-in type can be used.  The type
alias name must start with an upper case character.

closes: #13407

Signed-off-by: Christian Brabandt <cb@256bit.org>
Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
2023-10-27 19:35:26 +02:00

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/* vi:set ts=8 sts=4 sw=4 noet:
*
* VIM - Vi IMproved by Bram Moolenaar
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*/
/*
* json.c: Encoding and decoding JSON.
*
* Follows this standard: https://tools.ietf.org/html/rfc7159.html
*/
#define USING_FLOAT_STUFF
#include "vim.h"
#if defined(FEAT_EVAL) || defined(PROTO)
static int json_encode_item(garray_T *gap, typval_T *val, int copyID, int options);
/*
* Encode "val" into a JSON format string.
* The result is added to "gap"
* Returns FAIL on failure and makes gap->ga_data empty.
*/
static int
json_encode_gap(garray_T *gap, typval_T *val, int options)
{
if (json_encode_item(gap, val, get_copyID(), options) == FAIL)
{
ga_clear(gap);
gap->ga_data = vim_strsave((char_u *)"");
return FAIL;
}
return OK;
}
/*
* Encode "val" into a JSON format string.
* The result is in allocated memory.
* The result is empty when encoding fails.
* "options" can contain JSON_JS, JSON_NO_NONE and JSON_NL.
*/
char_u *
json_encode(typval_T *val, int options)
{
garray_T ga;
// Store bytes in the growarray.
ga_init2(&ga, 1, 4000);
json_encode_gap(&ga, val, options);
ga_append(&ga, NUL);
return ga.ga_data;
}
#if defined(FEAT_JOB_CHANNEL) || defined(PROTO)
/*
* Encode ["nr", "val"] into a JSON format string in allocated memory.
* "options" can contain JSON_JS, JSON_NO_NONE and JSON_NL.
* Returns NULL when out of memory.
*/
char_u *
json_encode_nr_expr(int nr, typval_T *val, int options)
{
typval_T listtv;
typval_T nrtv;
garray_T ga;
nrtv.v_type = VAR_NUMBER;
nrtv.vval.v_number = nr;
if (rettv_list_alloc(&listtv) == FAIL)
return NULL;
if (list_append_tv(listtv.vval.v_list, &nrtv) == FAIL
|| list_append_tv(listtv.vval.v_list, val) == FAIL)
{
list_unref(listtv.vval.v_list);
return NULL;
}
ga_init2(&ga, 1, 4000);
if (json_encode_gap(&ga, &listtv, options) == OK && (options & JSON_NL))
ga_append(&ga, '\n');
list_unref(listtv.vval.v_list);
ga_append(&ga, NUL);
return ga.ga_data;
}
/*
* Encode "val" into a JSON format string prefixed by the LSP HTTP header.
* Returns NULL when out of memory.
*/
char_u *
json_encode_lsp_msg(typval_T *val)
{
garray_T ga;
garray_T lspga;
ga_init2(&ga, 1, 4000);
if (json_encode_gap(&ga, val, 0) == FAIL)
return NULL;
ga_append(&ga, NUL);
ga_init2(&lspga, 1, 4000);
// Header according to LSP specification.
vim_snprintf((char *)IObuff, IOSIZE,
"Content-Length: %u\r\n\r\n",
ga.ga_len - 1);
ga_concat(&lspga, IObuff);
ga_concat_len(&lspga, ga.ga_data, ga.ga_len);
ga_clear(&ga);
return lspga.ga_data;
}
#endif
/*
* Lookup table to quickly know if the given ASCII character must be escaped.
*/
static const char ascii_needs_escape[128] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x0.
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x1.
0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x2.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x3.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x4.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, // 0x5.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x6.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x7.
};
/*
* Encode the utf-8 encoded string "str" into "gap".
*/
static void
write_string(garray_T *gap, char_u *str)
{
char_u *res = str;
char_u numbuf[NUMBUFLEN];
char_u *from;
#if defined(USE_ICONV)
vimconv_T conv;
char_u *converted = NULL;
#endif
int c;
if (res == NULL)
{
ga_concat(gap, (char_u *)"\"\"");
return;
}
#if defined(USE_ICONV)
if (!enc_utf8)
{
// Convert the text from 'encoding' to utf-8, because a JSON string is
// always utf-8.
conv.vc_type = CONV_NONE;
convert_setup(&conv, p_enc, (char_u*)"utf-8");
if (conv.vc_type != CONV_NONE)
converted = res = string_convert(&conv, res, NULL);
convert_setup(&conv, NULL, NULL);
}
#endif
ga_append(gap, '"');
// `from` is the beginning of a sequence of bytes we can directly copy from
// the input string, avoiding the overhead associated to decoding/encoding
// them.
from = res;
while ((c = *res) != NUL)
{
// always use utf-8 encoding, ignore 'encoding'
if (c < 0x80)
{
if (!ascii_needs_escape[c])
{
res += 1;
continue;
}
if (res != from)
ga_concat_len(gap, from, res - from);
from = res + 1;
switch (c)
{
case 0x08:
ga_append(gap, '\\'); ga_append(gap, 'b'); break;
case 0x09:
ga_append(gap, '\\'); ga_append(gap, 't'); break;
case 0x0a:
ga_append(gap, '\\'); ga_append(gap, 'n'); break;
case 0x0c:
ga_append(gap, '\\'); ga_append(gap, 'f'); break;
case 0x0d:
ga_append(gap, '\\'); ga_append(gap, 'r'); break;
case 0x22: // "
case 0x5c: // backslash
ga_append(gap, '\\');
ga_append(gap, c);
break;
default:
vim_snprintf((char *)numbuf, NUMBUFLEN, "\\u%04lx",
(long)c);
ga_concat(gap, numbuf);
}
res += 1;
}
else
{
int l = utf_ptr2len(res);
if (l > 1)
{
res += l;
continue;
}
// Invalid utf-8 sequence, replace it with the Unicode replacement
// character U+FFFD.
if (res != from)
ga_concat_len(gap, from, res - from);
from = res + 1;
numbuf[utf_char2bytes(0xFFFD, numbuf)] = NUL;
ga_concat(gap, numbuf);
res += l;
}
}
if (res != from)
ga_concat_len(gap, from, res - from);
ga_append(gap, '"');
#if defined(USE_ICONV)
vim_free(converted);
#endif
}
/*
* Return TRUE if "key" can be used without quotes.
* That is when it starts with a letter and only contains letters, digits and
* underscore.
*/
static int
is_simple_key(char_u *key)
{
char_u *p;
if (!ASCII_ISALPHA(*key))
return FALSE;
for (p = key + 1; *p != NUL; ++p)
if (!ASCII_ISALPHA(*p) && *p != '_' && !vim_isdigit(*p))
return FALSE;
return TRUE;
}
/*
* Encode "val" into "gap".
* Return FAIL or OK.
*/
static int
json_encode_item(garray_T *gap, typval_T *val, int copyID, int options)
{
char_u numbuf[NUMBUFLEN];
char_u *res;
blob_T *b;
list_T *l;
dict_T *d;
int i;
switch (val->v_type)
{
case VAR_BOOL:
switch ((long)val->vval.v_number)
{
case VVAL_FALSE: ga_concat(gap, (char_u *)"false"); break;
case VVAL_TRUE: ga_concat(gap, (char_u *)"true"); break;
}
break;
case VAR_SPECIAL:
switch ((long)val->vval.v_number)
{
case VVAL_NONE: if ((options & JSON_JS) != 0
&& (options & JSON_NO_NONE) == 0)
// empty item
break;
// FALLTHROUGH
case VVAL_NULL: ga_concat(gap, (char_u *)"null"); break;
}
break;
case VAR_NUMBER:
vim_snprintf((char *)numbuf, NUMBUFLEN, "%lld",
(varnumber_T)val->vval.v_number);
ga_concat(gap, numbuf);
break;
case VAR_STRING:
res = val->vval.v_string;
write_string(gap, res);
break;
case VAR_FUNC:
case VAR_PARTIAL:
case VAR_JOB:
case VAR_CHANNEL:
case VAR_INSTR:
case VAR_CLASS:
case VAR_OBJECT:
case VAR_TYPEALIAS:
semsg(_(e_cannot_json_encode_str), vartype_name(val->v_type));
return FAIL;
case VAR_BLOB:
b = val->vval.v_blob;
if (b == NULL || b->bv_ga.ga_len == 0)
ga_concat(gap, (char_u *)"[]");
else
{
ga_append(gap, '[');
for (i = 0; i < b->bv_ga.ga_len; i++)
{
if (i > 0)
ga_concat(gap, (char_u *)",");
vim_snprintf((char *)numbuf, NUMBUFLEN, "%d",
blob_get(b, i));
ga_concat(gap, numbuf);
}
ga_append(gap, ']');
}
break;
case VAR_LIST:
l = val->vval.v_list;
if (l == NULL)
ga_concat(gap, (char_u *)"[]");
else
{
if (l->lv_copyID == copyID)
ga_concat(gap, (char_u *)"[]");
else
{
listitem_T *li;
l->lv_copyID = copyID;
ga_append(gap, '[');
CHECK_LIST_MATERIALIZE(l);
for (li = l->lv_first; li != NULL && !got_int; )
{
if (json_encode_item(gap, &li->li_tv, copyID,
options & JSON_JS) == FAIL)
return FAIL;
if ((options & JSON_JS)
&& li->li_next == NULL
&& li->li_tv.v_type == VAR_SPECIAL
&& li->li_tv.vval.v_number == VVAL_NONE)
// add an extra comma if the last item is v:none
ga_append(gap, ',');
li = li->li_next;
if (li != NULL)
ga_append(gap, ',');
}
ga_append(gap, ']');
l->lv_copyID = 0;
}
}
break;
case VAR_DICT:
d = val->vval.v_dict;
if (d == NULL)
ga_concat(gap, (char_u *)"{}");
else
{
if (d->dv_copyID == copyID)
ga_concat(gap, (char_u *)"{}");
else
{
int first = TRUE;
int todo = (int)d->dv_hashtab.ht_used;
hashitem_T *hi;
d->dv_copyID = copyID;
ga_append(gap, '{');
for (hi = d->dv_hashtab.ht_array; todo > 0 && !got_int;
++hi)
if (!HASHITEM_EMPTY(hi))
{
--todo;
if (first)
first = FALSE;
else
ga_append(gap, ',');
if ((options & JSON_JS)
&& is_simple_key(hi->hi_key))
ga_concat(gap, hi->hi_key);
else
write_string(gap, hi->hi_key);
ga_append(gap, ':');
if (json_encode_item(gap, &dict_lookup(hi)->di_tv,
copyID, options | JSON_NO_NONE) == FAIL)
return FAIL;
}
ga_append(gap, '}');
d->dv_copyID = 0;
}
}
break;
case VAR_FLOAT:
#if defined(HAVE_MATH_H)
if (isnan(val->vval.v_float))
ga_concat(gap, (char_u *)"NaN");
else if (isinf(val->vval.v_float))
{
if (val->vval.v_float < 0.0)
ga_concat(gap, (char_u *)"-Infinity");
else
ga_concat(gap, (char_u *)"Infinity");
}
else
#endif
{
vim_snprintf((char *)numbuf, NUMBUFLEN, "%g",
val->vval.v_float);
ga_concat(gap, numbuf);
}
break;
case VAR_UNKNOWN:
case VAR_ANY:
case VAR_VOID:
internal_error_no_abort("json_encode_item()");
return FAIL;
}
return OK;
}
/*
* When "reader" has less than NUMBUFLEN bytes available, call the fill
* callback to get more.
*/
static void
fill_numbuflen(js_read_T *reader)
{
if (reader->js_fill != NULL && (int)(reader->js_end - reader->js_buf)
- reader->js_used < NUMBUFLEN)
{
if (reader->js_fill(reader))
reader->js_end = reader->js_buf + STRLEN(reader->js_buf);
}
}
/*
* 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);
}
static int
json_decode_string(js_read_T *reader, typval_T *res, int quote)
{
garray_T ga;
int len;
char_u *p;
int c;
varnumber_T nr;
if (res != NULL)
ga_init2(&ga, 1, 200);
p = reader->js_buf + reader->js_used + 1; // skip over " or '
while (*p != quote)
{
// The JSON is always expected to be utf-8, thus use utf functions
// here. The string is converted below if needed.
if (*p == NUL || p[1] == NUL || utf_ptr2len(p) < utf_byte2len(*p))
{
// Not enough bytes to make a character or end of the string. Get
// more if possible.
if (reader->js_fill == NULL)
break;
len = (int)(reader->js_end - p);
reader->js_used = (int)(p - reader->js_buf);
if (!reader->js_fill(reader))
break; // didn't get more
p = reader->js_buf + reader->js_used;
reader->js_end = reader->js_buf + STRLEN(reader->js_buf);
continue;
}
if (*p == '\\')
{
c = -1;
switch (p[1])
{
case '\\': c = '\\'; break;
case '"': c = '"'; break;
case 'b': c = BS; break;
case 't': c = TAB; break;
case 'n': c = NL; break;
case 'f': c = FF; break;
case 'r': c = CAR; break;
case 'u':
if (reader->js_fill != NULL
&& (int)(reader->js_end - p) < NUMBUFLEN)
{
reader->js_used = (int)(p - reader->js_buf);
if (reader->js_fill(reader))
{
p = reader->js_buf + reader->js_used;
reader->js_end = reader->js_buf
+ STRLEN(reader->js_buf);
}
}
nr = 0;
len = 0;
vim_str2nr(p + 2, NULL, &len,
STR2NR_HEX + STR2NR_FORCE, &nr, NULL, 4, TRUE, NULL);
if (len == 0)
{
if (res != NULL)
ga_clear(&ga);
return FAIL;
}
p += len + 2;
if (0xd800 <= nr && nr <= 0xdfff
&& (int)(reader->js_end - p) >= 6
&& *p == '\\' && *(p+1) == 'u')
{
varnumber_T nr2 = 0;
// decode surrogate pair: \ud812\u3456
len = 0;
vim_str2nr(p + 2, NULL, &len, STR2NR_HEX + STR2NR_FORCE,
&nr2, NULL, 4, TRUE, NULL);
if (len == 0)
{
if (res != NULL)
ga_clear(&ga);
return FAIL;
}
if (0xdc00 <= nr2 && nr2 <= 0xdfff)
{
p += len + 2;
nr = (((nr - 0xd800) << 10) |
((nr2 - 0xdc00) & 0x3ff)) + 0x10000;
}
}
if (res != NULL)
{
char_u buf[NUMBUFLEN];
buf[utf_char2bytes((int)nr, buf)] = NUL;
ga_concat(&ga, buf);
}
break;
default:
// not a special char, skip over backslash
++p;
continue;
}
if (c > 0)
{
p += 2;
if (res != NULL)
ga_append(&ga, c);
}
}
else
{
len = utf_ptr2len(p);
if (res != NULL)
{
if (ga_grow(&ga, len) == FAIL)
{
ga_clear(&ga);
return FAIL;
}
mch_memmove((char *)ga.ga_data + ga.ga_len, p, (size_t)len);
ga.ga_len += len;
}
p += len;
}
}
reader->js_used = (int)(p - reader->js_buf);
if (*p == quote)
{
++reader->js_used;
if (res != NULL)
{
ga_append(&ga, NUL);
res->v_type = VAR_STRING;
#if defined(USE_ICONV)
if (!enc_utf8)
{
vimconv_T conv;
// Convert the utf-8 string to 'encoding'.
conv.vc_type = CONV_NONE;
convert_setup(&conv, (char_u*)"utf-8", p_enc);
if (conv.vc_type != CONV_NONE)
{
res->vval.v_string =
string_convert(&conv, ga.ga_data, NULL);
vim_free(ga.ga_data);
}
convert_setup(&conv, NULL, NULL);
}
else
#endif
res->vval.v_string = ga.ga_data;
}
return OK;
}
if (res != NULL)
{
res->v_type = VAR_SPECIAL;
res->vval.v_number = VVAL_NONE;
ga_clear(&ga);
}
return MAYBE;
}
typedef enum {
JSON_ARRAY, // parsing items in an array
JSON_OBJECT_KEY, // parsing key of an object
JSON_OBJECT // parsing item in an object, after the key
} json_decode_T;
typedef struct {
json_decode_T jd_type;
typval_T jd_tv; // the list or dict
typval_T jd_key_tv;
char_u *jd_key;
} json_dec_item_T;
/*
* 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 i;
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;
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, 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
{
semsg(_(e_json_decode_error_at_str), p);
retval = FAIL;
}
break;
case ',': // comma: empty item
if ((options & JSON_JS) == 0)
{
semsg(_(e_json_decode_error_at_str), p);
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 == '-'
&& (VIM_ISDIGIT(p[1]) || p[1] == NUL)))
{
char_u *sp = p;
if (*sp == '-')
{
++sp;
if (*sp == NUL)
{
retval = MAYBE;
break;
}
if (!VIM_ISDIGIT(*sp))
{
semsg(_(e_json_decode_error_at_str), p);
retval = FAIL;
break;
}
}
sp = skipdigits(sp);
if (*sp == '.' || *sp == 'e' || *sp == 'E')
{
if (cur_item == NULL)
{
float_T f;
len = string2float(p, &f, FALSE);
}
else
{
cur_item->v_type = VAR_FLOAT;
len = string2float(p, &cur_item->vval.v_float,
FALSE);
}
}
else
{
varnumber_T nr;
vim_str2nr(reader->js_buf + reader->js_used,
NULL, &len, 0, // what
&nr, NULL, 0, TRUE, NULL);
if (len == 0)
{
semsg(_(e_json_decode_error_at_str), p);
retval = FAIL;
goto theend;
}
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_BOOL;
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_BOOL;
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;
}
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", 9) == 0)
{
reader->js_used += 9;
if (cur_item != NULL)
{
cur_item->v_type = VAR_FLOAT;
cur_item->vval.v_float = -INFINITY;
}
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;
}
// 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 < 9
&& STRNICMP((char *)p, "-Infinity", len) == 0)
|| (len < 8
&& STRNICMP((char *)p, "Infinity", len) == 0)
|| (len < 3 && STRNICMP((char *)p, "NaN", len) == 0)
|| (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)
{
if (cur_item->v_type == VAR_FLOAT)
{
// cannot use a float as a key
emsg(_(e_using_float_as_string));
retval = FAIL;
goto theend;
}
top_item->jd_key = tv_get_string_buf_chk(cur_item, key_buf);
if (top_item->jd_key == NULL)
{
emsg(_(e_invalid_argument));
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
{
semsg(_(e_json_decode_error_at_str), p);
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
{
semsg(_(e_json_decode_error_at_str), p);
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_has_key(top_item->jd_tv.vval.v_dict,
(char *)top_item->jd_key))
{
semsg(_(e_duplicate_key_in_json_str), top_item->jd_key);
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
{
semsg(_(e_json_decode_error_at_str), p);
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;
}
semsg(_(e_json_decode_error_at_str), p);
theend:
for (i = 0; i < stack.ga_len; i++)
clear_tv(&(((json_dec_item_T *)stack.ga_data) + i)->jd_key_tv);
ga_clear(&stack);
return retval;
}
/*
* Decode the JSON from "reader" and store the result in "res".
* "options" can be JSON_JS or zero;
* Return FAIL if not the whole message was consumed.
*/
static int
json_decode_all(js_read_T *reader, typval_T *res, int options)
{
int ret;
// We find the end once, to avoid calling strlen() many times.
reader->js_end = reader->js_buf + STRLEN(reader->js_buf);
json_skip_white(reader);
ret = json_decode_item(reader, res, options);
if (ret != OK)
{
if (ret == MAYBE)
semsg(_(e_json_decode_error_at_str), reader->js_buf);
return FAIL;
}
json_skip_white(reader);
if (reader->js_buf[reader->js_used] != NUL)
{
semsg(_(e_trailing_characters_str), reader->js_buf + reader->js_used);
return FAIL;
}
return OK;
}
#if defined(FEAT_JOB_CHANNEL) || defined(PROTO)
/*
* Decode the JSON from "reader" and store the result in "res".
* "options" can be JSON_JS or zero;
* Return FAIL for a decoding error.
* Return MAYBE for an incomplete message.
* Consumes the message anyway.
*/
int
json_decode(js_read_T *reader, typval_T *res, int options)
{
int ret;
// We find the end once, to avoid calling strlen() many times.
reader->js_end = reader->js_buf + STRLEN(reader->js_buf);
json_skip_white(reader);
ret = json_decode_item(reader, res, options);
json_skip_white(reader);
return ret;
}
#endif
/*
* Decode the JSON from "reader" to find the end of the message.
* "options" can be JSON_JS or zero.
* This is only used for testing.
* Return FAIL if the message has a decoding error.
* Return MAYBE if the message is truncated, need to read more.
* This only works reliable if the message contains an object, array or
* string. A number might be truncated without knowing.
* Does not advance the reader.
*/
int
json_find_end(js_read_T *reader, int options)
{
int used_save = reader->js_used;
int ret;
// We find the end once, to avoid calling strlen() many times.
reader->js_end = reader->js_buf + STRLEN(reader->js_buf);
json_skip_white(reader);
ret = json_decode_item(reader, NULL, options);
reader->js_used = used_save;
return ret;
}
/*
* "js_decode()" function
*/
void
f_js_decode(typval_T *argvars, typval_T *rettv)
{
js_read_T reader;
if (in_vim9script() && check_for_string_arg(argvars, 0) == FAIL)
return;
reader.js_buf = tv_get_string(&argvars[0]);
reader.js_fill = NULL;
reader.js_used = 0;
if (json_decode_all(&reader, rettv, JSON_JS) != OK)
emsg(_(e_invalid_argument));
}
/*
* "js_encode()" function
*/
void
f_js_encode(typval_T *argvars, typval_T *rettv)
{
rettv->v_type = VAR_STRING;
rettv->vval.v_string = json_encode(&argvars[0], JSON_JS);
}
/*
* "json_decode()" function
*/
void
f_json_decode(typval_T *argvars, typval_T *rettv)
{
js_read_T reader;
if (in_vim9script() && check_for_string_arg(argvars, 0) == FAIL)
return;
reader.js_buf = tv_get_string(&argvars[0]);
reader.js_fill = NULL;
reader.js_used = 0;
json_decode_all(&reader, rettv, 0);
}
/*
* "json_encode()" function
*/
void
f_json_encode(typval_T *argvars, typval_T *rettv)
{
rettv->v_type = VAR_STRING;
rettv->vval.v_string = json_encode(&argvars[0], 0);
}
#endif
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