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json.c
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1 /*-------------------------------------------------------------------------
2  *
3  * json.c
4  * JSON data type support.
5  *
6  * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  * IDENTIFICATION
10  * src/backend/utils/adt/json.c
11  *
12  *-------------------------------------------------------------------------
13  */
14 #include "postgres.h"
15 
16 #include "access/htup_details.h"
17 #include "access/transam.h"
18 #include "catalog/pg_type.h"
19 #include "executor/spi.h"
20 #include "lib/stringinfo.h"
21 #include "libpq/pqformat.h"
22 #include "mb/pg_wchar.h"
23 #include "miscadmin.h"
24 #include "parser/parse_coerce.h"
25 #include "utils/array.h"
26 #include "utils/builtins.h"
27 #include "utils/date.h"
28 #include "utils/datetime.h"
29 #include "utils/lsyscache.h"
30 #include "utils/json.h"
31 #include "utils/jsonapi.h"
32 #include "utils/typcache.h"
33 #include "utils/syscache.h"
34 
35 /*
36  * The context of the parser is maintained by the recursive descent
37  * mechanism, but is passed explicitly to the error reporting routine
38  * for better diagnostics.
39  */
40 typedef enum /* contexts of JSON parser */
41 {
42  JSON_PARSE_VALUE, /* expecting a value */
43  JSON_PARSE_STRING, /* expecting a string (for a field name) */
44  JSON_PARSE_ARRAY_START, /* saw '[', expecting value or ']' */
45  JSON_PARSE_ARRAY_NEXT, /* saw array element, expecting ',' or ']' */
46  JSON_PARSE_OBJECT_START, /* saw '{', expecting label or '}' */
47  JSON_PARSE_OBJECT_LABEL, /* saw object label, expecting ':' */
48  JSON_PARSE_OBJECT_NEXT, /* saw object value, expecting ',' or '}' */
49  JSON_PARSE_OBJECT_COMMA, /* saw object ',', expecting next label */
50  JSON_PARSE_END /* saw the end of a document, expect nothing */
52 
53 typedef enum /* type categories for datum_to_json */
54 {
55  JSONTYPE_NULL, /* null, so we didn't bother to identify */
56  JSONTYPE_BOOL, /* boolean (built-in types only) */
57  JSONTYPE_NUMERIC, /* numeric (ditto) */
58  JSONTYPE_DATE, /* we use special formatting for datetimes */
61  JSONTYPE_JSON, /* JSON itself (and JSONB) */
62  JSONTYPE_ARRAY, /* array */
63  JSONTYPE_COMPOSITE, /* composite */
64  JSONTYPE_CAST, /* something with an explicit cast to JSON */
65  JSONTYPE_OTHER /* all else */
67 
68 typedef struct JsonAggState
69 {
75 } JsonAggState;
76 
77 static inline void json_lex(JsonLexContext *lex);
78 static inline void json_lex_string(JsonLexContext *lex);
79 static inline void json_lex_number(JsonLexContext *lex, char *s,
80  bool *num_err, int *total_len);
81 static inline void parse_scalar(JsonLexContext *lex, JsonSemAction *sem);
82 static void parse_object_field(JsonLexContext *lex, JsonSemAction *sem);
83 static void parse_object(JsonLexContext *lex, JsonSemAction *sem);
84 static void parse_array_element(JsonLexContext *lex, JsonSemAction *sem);
85 static void parse_array(JsonLexContext *lex, JsonSemAction *sem);
87 static void report_invalid_token(JsonLexContext *lex);
88 static int report_json_context(JsonLexContext *lex);
89 static char *extract_mb_char(char *s);
90 static void composite_to_json(Datum composite, StringInfo result,
91  bool use_line_feeds);
92 static void array_dim_to_json(StringInfo result, int dim, int ndims, int *dims,
93  Datum *vals, bool *nulls, int *valcount,
94  JsonTypeCategory tcategory, Oid outfuncoid,
95  bool use_line_feeds);
97  bool use_line_feeds);
98 static void json_categorize_type(Oid typoid,
99  JsonTypeCategory *tcategory,
100  Oid *outfuncoid);
101 static void datum_to_json(Datum val, bool is_null, StringInfo result,
102  JsonTypeCategory tcategory, Oid outfuncoid,
103  bool key_scalar);
104 static void add_json(Datum val, bool is_null, StringInfo result,
105  Oid val_type, bool key_scalar);
106 static text *catenate_stringinfo_string(StringInfo buffer, const char *addon);
107 
108 /* the null action object used for pure validation */
110 {
111  NULL, NULL, NULL, NULL, NULL,
112  NULL, NULL, NULL, NULL, NULL
113 };
114 
115 /* Recursive Descent parser support routines */
116 
117 /*
118  * lex_peek
119  *
120  * what is the current look_ahead token?
121 */
122 static inline JsonTokenType
124 {
125  return lex->token_type;
126 }
127 
128 /*
129  * lex_accept
130  *
131  * accept the look_ahead token and move the lexer to the next token if the
132  * look_ahead token matches the token parameter. In that case, and if required,
133  * also hand back the de-escaped lexeme.
134  *
135  * returns true if the token matched, false otherwise.
136  */
137 static inline bool
138 lex_accept(JsonLexContext *lex, JsonTokenType token, char **lexeme)
139 {
140  if (lex->token_type == token)
141  {
142  if (lexeme != NULL)
143  {
144  if (lex->token_type == JSON_TOKEN_STRING)
145  {
146  if (lex->strval != NULL)
147  *lexeme = pstrdup(lex->strval->data);
148  }
149  else
150  {
151  int len = (lex->token_terminator - lex->token_start);
152  char *tokstr = palloc(len + 1);
153 
154  memcpy(tokstr, lex->token_start, len);
155  tokstr[len] = '\0';
156  *lexeme = tokstr;
157  }
158  }
159  json_lex(lex);
160  return true;
161  }
162  return false;
163 }
164 
165 /*
166  * lex_accept
167  *
168  * move the lexer to the next token if the current look_ahead token matches
169  * the parameter token. Otherwise, report an error.
170  */
171 static inline void
173 {
174  if (!lex_accept(lex, token, NULL))
175  report_parse_error(ctx, lex);
176 }
177 
178 /* chars to consider as part of an alphanumeric token */
179 #define JSON_ALPHANUMERIC_CHAR(c) \
180  (((c) >= 'a' && (c) <= 'z') || \
181  ((c) >= 'A' && (c) <= 'Z') || \
182  ((c) >= '0' && (c) <= '9') || \
183  (c) == '_' || \
184  IS_HIGHBIT_SET(c))
185 
186 /*
187  * Utility function to check if a string is a valid JSON number.
188  *
189  * str is of length len, and need not be null-terminated.
190  */
191 bool
192 IsValidJsonNumber(const char *str, int len)
193 {
194  bool numeric_error;
195  int total_len;
196  JsonLexContext dummy_lex;
197 
198  if (len <= 0)
199  return false;
200 
201  /*
202  * json_lex_number expects a leading '-' to have been eaten already.
203  *
204  * having to cast away the constness of str is ugly, but there's not much
205  * easy alternative.
206  */
207  if (*str == '-')
208  {
209  dummy_lex.input = (char *) str + 1;
210  dummy_lex.input_length = len - 1;
211  }
212  else
213  {
214  dummy_lex.input = (char *) str;
215  dummy_lex.input_length = len;
216  }
217 
218  json_lex_number(&dummy_lex, dummy_lex.input, &numeric_error, &total_len);
219 
220  return (!numeric_error) && (total_len == dummy_lex.input_length);
221 }
222 
223 /*
224  * Input.
225  */
226 Datum
228 {
229  char *json = PG_GETARG_CSTRING(0);
230  text *result = cstring_to_text(json);
231  JsonLexContext *lex;
232 
233  /* validate it */
234  lex = makeJsonLexContext(result, false);
235  pg_parse_json(lex, &nullSemAction);
236 
237  /* Internal representation is the same as text, for now */
238  PG_RETURN_TEXT_P(result);
239 }
240 
241 /*
242  * Output.
243  */
244 Datum
246 {
247  /* we needn't detoast because text_to_cstring will handle that */
248  Datum txt = PG_GETARG_DATUM(0);
249 
251 }
252 
253 /*
254  * Binary send.
255  */
256 Datum
258 {
259  text *t = PG_GETARG_TEXT_PP(0);
261 
262  pq_begintypsend(&buf);
265 }
266 
267 /*
268  * Binary receive.
269  */
270 Datum
272 {
274  char *str;
275  int nbytes;
276  JsonLexContext *lex;
277 
278  str = pq_getmsgtext(buf, buf->len - buf->cursor, &nbytes);
279 
280  /* Validate it. */
281  lex = makeJsonLexContextCstringLen(str, nbytes, false);
282  pg_parse_json(lex, &nullSemAction);
283 
285 }
286 
287 /*
288  * makeJsonLexContext
289  *
290  * lex constructor, with or without StringInfo object
291  * for de-escaped lexemes.
292  *
293  * Without is better as it makes the processing faster, so only make one
294  * if really required.
295  *
296  * If you already have the json as a text* value, use the first of these
297  * functions, otherwise use makeJsonLexContextCstringLen().
298  */
300 makeJsonLexContext(text *json, bool need_escapes)
301 {
303  VARSIZE_ANY_EXHDR(json),
304  need_escapes);
305 }
306 
308 makeJsonLexContextCstringLen(char *json, int len, bool need_escapes)
309 {
310  JsonLexContext *lex = palloc0(sizeof(JsonLexContext));
311 
312  lex->input = lex->token_terminator = lex->line_start = json;
313  lex->line_number = 1;
314  lex->input_length = len;
315  if (need_escapes)
316  lex->strval = makeStringInfo();
317  return lex;
318 }
319 
320 /*
321  * pg_parse_json
322  *
323  * Publicly visible entry point for the JSON parser.
324  *
325  * lex is a lexing context, set up for the json to be processed by calling
326  * makeJsonLexContext(). sem is a structure of function pointers to semantic
327  * action routines to be called at appropriate spots during parsing, and a
328  * pointer to a state object to be passed to those routines.
329  */
330 void
332 {
333  JsonTokenType tok;
334 
335  /* get the initial token */
336  json_lex(lex);
337 
338  tok = lex_peek(lex);
339 
340  /* parse by recursive descent */
341  switch (tok)
342  {
344  parse_object(lex, sem);
345  break;
347  parse_array(lex, sem);
348  break;
349  default:
350  parse_scalar(lex, sem); /* json can be a bare scalar */
351  }
352 
354 
355 }
356 
357 /*
358  * json_count_array_elements
359  *
360  * Returns number of array elements in lex context at start of array token
361  * until end of array token at same nesting level.
362  *
363  * Designed to be called from array_start routines.
364  */
365 int
367 {
368  JsonLexContext copylex;
369  int count;
370 
371  /*
372  * It's safe to do this with a shallow copy because the lexical routines
373  * don't scribble on the input. They do scribble on the other pointers
374  * etc, so doing this with a copy makes that safe.
375  */
376  memcpy(&copylex, lex, sizeof(JsonLexContext));
377  copylex.strval = NULL; /* not interested in values here */
378  copylex.lex_level++;
379 
380  count = 0;
382  if (lex_peek(&copylex) != JSON_TOKEN_ARRAY_END)
383  {
384  do
385  {
386  count++;
387  parse_array_element(&copylex, &nullSemAction);
388  }
389  while (lex_accept(&copylex, JSON_TOKEN_COMMA, NULL));
390  }
392 
393  return count;
394 }
395 
396 /*
397  * Recursive Descent parse routines. There is one for each structural
398  * element in a json document:
399  * - scalar (string, number, true, false, null)
400  * - array ( [ ] )
401  * - array element
402  * - object ( { } )
403  * - object field
404  */
405 static inline void
407 {
408  char *val = NULL;
409  json_scalar_action sfunc = sem->scalar;
410  char **valaddr;
411  JsonTokenType tok = lex_peek(lex);
412 
413  valaddr = sfunc == NULL ? NULL : &val;
414 
415  /* a scalar must be a string, a number, true, false, or null */
416  switch (tok)
417  {
418  case JSON_TOKEN_TRUE:
419  lex_accept(lex, JSON_TOKEN_TRUE, valaddr);
420  break;
421  case JSON_TOKEN_FALSE:
422  lex_accept(lex, JSON_TOKEN_FALSE, valaddr);
423  break;
424  case JSON_TOKEN_NULL:
425  lex_accept(lex, JSON_TOKEN_NULL, valaddr);
426  break;
427  case JSON_TOKEN_NUMBER:
428  lex_accept(lex, JSON_TOKEN_NUMBER, valaddr);
429  break;
430  case JSON_TOKEN_STRING:
431  lex_accept(lex, JSON_TOKEN_STRING, valaddr);
432  break;
433  default:
435  }
436 
437  if (sfunc != NULL)
438  (*sfunc) (sem->semstate, val, tok);
439 }
440 
441 static void
443 {
444  /*
445  * An object field is "fieldname" : value where value can be a scalar,
446  * object or array. Note: in user-facing docs and error messages, we
447  * generally call a field name a "key".
448  */
449 
450  char *fname = NULL; /* keep compiler quiet */
453  bool isnull;
454  char **fnameaddr = NULL;
455  JsonTokenType tok;
456 
457  if (ostart != NULL || oend != NULL)
458  fnameaddr = &fname;
459 
460  if (!lex_accept(lex, JSON_TOKEN_STRING, fnameaddr))
462 
464 
465  tok = lex_peek(lex);
466  isnull = tok == JSON_TOKEN_NULL;
467 
468  if (ostart != NULL)
469  (*ostart) (sem->semstate, fname, isnull);
470 
471  switch (tok)
472  {
474  parse_object(lex, sem);
475  break;
477  parse_array(lex, sem);
478  break;
479  default:
480  parse_scalar(lex, sem);
481  }
482 
483  if (oend != NULL)
484  (*oend) (sem->semstate, fname, isnull);
485 }
486 
487 static void
489 {
490  /*
491  * an object is a possibly empty sequence of object fields, separated by
492  * commas and surrounded by curly braces.
493  */
494  json_struct_action ostart = sem->object_start;
495  json_struct_action oend = sem->object_end;
496  JsonTokenType tok;
497 
499 
500  if (ostart != NULL)
501  (*ostart) (sem->semstate);
502 
503  /*
504  * Data inside an object is at a higher nesting level than the object
505  * itself. Note that we increment this after we call the semantic routine
506  * for the object start and restore it before we call the routine for the
507  * object end.
508  */
509  lex->lex_level++;
510 
511  /* we know this will succeed, just clearing the token */
513 
514  tok = lex_peek(lex);
515  switch (tok)
516  {
517  case JSON_TOKEN_STRING:
518  parse_object_field(lex, sem);
519  while (lex_accept(lex, JSON_TOKEN_COMMA, NULL))
520  parse_object_field(lex, sem);
521  break;
523  break;
524  default:
525  /* case of an invalid initial token inside the object */
527  }
528 
530 
531  lex->lex_level--;
532 
533  if (oend != NULL)
534  (*oend) (sem->semstate);
535 }
536 
537 static void
539 {
542  JsonTokenType tok = lex_peek(lex);
543 
544  bool isnull;
545 
546  isnull = tok == JSON_TOKEN_NULL;
547 
548  if (astart != NULL)
549  (*astart) (sem->semstate, isnull);
550 
551  /* an array element is any object, array or scalar */
552  switch (tok)
553  {
555  parse_object(lex, sem);
556  break;
558  parse_array(lex, sem);
559  break;
560  default:
561  parse_scalar(lex, sem);
562  }
563 
564  if (aend != NULL)
565  (*aend) (sem->semstate, isnull);
566 }
567 
568 static void
570 {
571  /*
572  * an array is a possibly empty sequence of array elements, separated by
573  * commas and surrounded by square brackets.
574  */
575  json_struct_action astart = sem->array_start;
576  json_struct_action aend = sem->array_end;
577 
579 
580  if (astart != NULL)
581  (*astart) (sem->semstate);
582 
583  /*
584  * Data inside an array is at a higher nesting level than the array
585  * itself. Note that we increment this after we call the semantic routine
586  * for the array start and restore it before we call the routine for the
587  * array end.
588  */
589  lex->lex_level++;
590 
592  if (lex_peek(lex) != JSON_TOKEN_ARRAY_END)
593  {
594 
595  parse_array_element(lex, sem);
596 
597  while (lex_accept(lex, JSON_TOKEN_COMMA, NULL))
598  parse_array_element(lex, sem);
599  }
600 
602 
603  lex->lex_level--;
604 
605  if (aend != NULL)
606  (*aend) (sem->semstate);
607 }
608 
609 /*
610  * Lex one token from the input stream.
611  */
612 static inline void
614 {
615  char *s;
616  int len;
617 
618  /* Skip leading whitespace. */
619  s = lex->token_terminator;
620  len = s - lex->input;
621  while (len < lex->input_length &&
622  (*s == ' ' || *s == '\t' || *s == '\n' || *s == '\r'))
623  {
624  if (*s == '\n')
625  ++lex->line_number;
626  ++s;
627  ++len;
628  }
629  lex->token_start = s;
630 
631  /* Determine token type. */
632  if (len >= lex->input_length)
633  {
634  lex->token_start = NULL;
636  lex->token_terminator = s;
637  lex->token_type = JSON_TOKEN_END;
638  }
639  else
640  switch (*s)
641  {
642  /* Single-character token, some kind of punctuation mark. */
643  case '{':
645  lex->token_terminator = s + 1;
647  break;
648  case '}':
650  lex->token_terminator = s + 1;
652  break;
653  case '[':
655  lex->token_terminator = s + 1;
657  break;
658  case ']':
660  lex->token_terminator = s + 1;
662  break;
663  case ',':
665  lex->token_terminator = s + 1;
667  break;
668  case ':':
670  lex->token_terminator = s + 1;
672  break;
673  case '"':
674  /* string */
675  json_lex_string(lex);
677  break;
678  case '-':
679  /* Negative number. */
680  json_lex_number(lex, s + 1, NULL, NULL);
682  break;
683  case '0':
684  case '1':
685  case '2':
686  case '3':
687  case '4':
688  case '5':
689  case '6':
690  case '7':
691  case '8':
692  case '9':
693  /* Positive number. */
694  json_lex_number(lex, s, NULL, NULL);
696  break;
697  default:
698  {
699  char *p;
700 
701  /*
702  * We're not dealing with a string, number, legal
703  * punctuation mark, or end of string. The only legal
704  * tokens we might find here are true, false, and null,
705  * but for error reporting purposes we scan until we see a
706  * non-alphanumeric character. That way, we can report
707  * the whole word as an unexpected token, rather than just
708  * some unintuitive prefix thereof.
709  */
710  for (p = s; p - s < lex->input_length - len && JSON_ALPHANUMERIC_CHAR(*p); p++)
711  /* skip */ ;
712 
713  /*
714  * We got some sort of unexpected punctuation or an
715  * otherwise unexpected character, so just complain about
716  * that one character.
717  */
718  if (p == s)
719  {
721  lex->token_terminator = s + 1;
723  }
724 
725  /*
726  * We've got a real alphanumeric token here. If it
727  * happens to be true, false, or null, all is well. If
728  * not, error out.
729  */
731  lex->token_terminator = p;
732  if (p - s == 4)
733  {
734  if (memcmp(s, "true", 4) == 0)
736  else if (memcmp(s, "null", 4) == 0)
738  else
740  }
741  else if (p - s == 5 && memcmp(s, "false", 5) == 0)
743  else
745 
746  }
747  } /* end of switch */
748 }
749 
750 /*
751  * The next token in the input stream is known to be a string; lex it.
752  */
753 static inline void
755 {
756  char *s;
757  int len;
758  int hi_surrogate = -1;
759 
760  if (lex->strval != NULL)
761  resetStringInfo(lex->strval);
762 
763  Assert(lex->input_length > 0);
764  s = lex->token_start;
765  len = lex->token_start - lex->input;
766  for (;;)
767  {
768  s++;
769  len++;
770  /* Premature end of the string. */
771  if (len >= lex->input_length)
772  {
773  lex->token_terminator = s;
775  }
776  else if (*s == '"')
777  break;
778  else if ((unsigned char) *s < 32)
779  {
780  /* Per RFC4627, these characters MUST be escaped. */
781  /* Since *s isn't printable, exclude it from the context string */
782  lex->token_terminator = s;
783  ereport(ERROR,
784  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
785  errmsg("invalid input syntax for type %s", "json"),
786  errdetail("Character with value 0x%02x must be escaped.",
787  (unsigned char) *s),
788  report_json_context(lex)));
789  }
790  else if (*s == '\\')
791  {
792  /* OK, we have an escape character. */
793  s++;
794  len++;
795  if (len >= lex->input_length)
796  {
797  lex->token_terminator = s;
799  }
800  else if (*s == 'u')
801  {
802  int i;
803  int ch = 0;
804 
805  for (i = 1; i <= 4; i++)
806  {
807  s++;
808  len++;
809  if (len >= lex->input_length)
810  {
811  lex->token_terminator = s;
813  }
814  else if (*s >= '0' && *s <= '9')
815  ch = (ch * 16) + (*s - '0');
816  else if (*s >= 'a' && *s <= 'f')
817  ch = (ch * 16) + (*s - 'a') + 10;
818  else if (*s >= 'A' && *s <= 'F')
819  ch = (ch * 16) + (*s - 'A') + 10;
820  else
821  {
822  lex->token_terminator = s + pg_mblen(s);
823  ereport(ERROR,
824  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
825  errmsg("invalid input syntax for type %s",
826  "json"),
827  errdetail("\"\\u\" must be followed by four hexadecimal digits."),
828  report_json_context(lex)));
829  }
830  }
831  if (lex->strval != NULL)
832  {
833  char utf8str[5];
834  int utf8len;
835 
836  if (ch >= 0xd800 && ch <= 0xdbff)
837  {
838  if (hi_surrogate != -1)
839  ereport(ERROR,
840  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
841  errmsg("invalid input syntax for type %s",
842  "json"),
843  errdetail("Unicode high surrogate must not follow a high surrogate."),
844  report_json_context(lex)));
845  hi_surrogate = (ch & 0x3ff) << 10;
846  continue;
847  }
848  else if (ch >= 0xdc00 && ch <= 0xdfff)
849  {
850  if (hi_surrogate == -1)
851  ereport(ERROR,
852  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
853  errmsg("invalid input syntax for type %s", "json"),
854  errdetail("Unicode low surrogate must follow a high surrogate."),
855  report_json_context(lex)));
856  ch = 0x10000 + hi_surrogate + (ch & 0x3ff);
857  hi_surrogate = -1;
858  }
859 
860  if (hi_surrogate != -1)
861  ereport(ERROR,
862  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
863  errmsg("invalid input syntax for type %s", "json"),
864  errdetail("Unicode low surrogate must follow a high surrogate."),
865  report_json_context(lex)));
866 
867  /*
868  * For UTF8, replace the escape sequence by the actual
869  * utf8 character in lex->strval. Do this also for other
870  * encodings if the escape designates an ASCII character,
871  * otherwise raise an error.
872  */
873 
874  if (ch == 0)
875  {
876  /* We can't allow this, since our TEXT type doesn't */
877  ereport(ERROR,
878  (errcode(ERRCODE_UNTRANSLATABLE_CHARACTER),
879  errmsg("unsupported Unicode escape sequence"),
880  errdetail("\\u0000 cannot be converted to text."),
881  report_json_context(lex)));
882  }
883  else if (GetDatabaseEncoding() == PG_UTF8)
884  {
885  unicode_to_utf8(ch, (unsigned char *) utf8str);
886  utf8len = pg_utf_mblen((unsigned char *) utf8str);
887  appendBinaryStringInfo(lex->strval, utf8str, utf8len);
888  }
889  else if (ch <= 0x007f)
890  {
891  /*
892  * This is the only way to designate things like a
893  * form feed character in JSON, so it's useful in all
894  * encodings.
895  */
896  appendStringInfoChar(lex->strval, (char) ch);
897  }
898  else
899  {
900  ereport(ERROR,
901  (errcode(ERRCODE_UNTRANSLATABLE_CHARACTER),
902  errmsg("unsupported Unicode escape sequence"),
903  errdetail("Unicode escape values cannot be used for code point values above 007F when the server encoding is not UTF8."),
904  report_json_context(lex)));
905  }
906 
907  }
908  }
909  else if (lex->strval != NULL)
910  {
911  if (hi_surrogate != -1)
912  ereport(ERROR,
913  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
914  errmsg("invalid input syntax for type %s",
915  "json"),
916  errdetail("Unicode low surrogate must follow a high surrogate."),
917  report_json_context(lex)));
918 
919  switch (*s)
920  {
921  case '"':
922  case '\\':
923  case '/':
924  appendStringInfoChar(lex->strval, *s);
925  break;
926  case 'b':
927  appendStringInfoChar(lex->strval, '\b');
928  break;
929  case 'f':
930  appendStringInfoChar(lex->strval, '\f');
931  break;
932  case 'n':
933  appendStringInfoChar(lex->strval, '\n');
934  break;
935  case 'r':
936  appendStringInfoChar(lex->strval, '\r');
937  break;
938  case 't':
939  appendStringInfoChar(lex->strval, '\t');
940  break;
941  default:
942  /* Not a valid string escape, so error out. */
943  lex->token_terminator = s + pg_mblen(s);
944  ereport(ERROR,
945  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
946  errmsg("invalid input syntax for type %s",
947  "json"),
948  errdetail("Escape sequence \"\\%s\" is invalid.",
949  extract_mb_char(s)),
950  report_json_context(lex)));
951  }
952  }
953  else if (strchr("\"\\/bfnrt", *s) == NULL)
954  {
955  /*
956  * Simpler processing if we're not bothered about de-escaping
957  *
958  * It's very tempting to remove the strchr() call here and
959  * replace it with a switch statement, but testing so far has
960  * shown it's not a performance win.
961  */
962  lex->token_terminator = s + pg_mblen(s);
963  ereport(ERROR,
964  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
965  errmsg("invalid input syntax for type %s", "json"),
966  errdetail("Escape sequence \"\\%s\" is invalid.",
967  extract_mb_char(s)),
968  report_json_context(lex)));
969  }
970 
971  }
972  else if (lex->strval != NULL)
973  {
974  if (hi_surrogate != -1)
975  ereport(ERROR,
976  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
977  errmsg("invalid input syntax for type %s", "json"),
978  errdetail("Unicode low surrogate must follow a high surrogate."),
979  report_json_context(lex)));
980 
981  appendStringInfoChar(lex->strval, *s);
982  }
983 
984  }
985 
986  if (hi_surrogate != -1)
987  ereport(ERROR,
988  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
989  errmsg("invalid input syntax for type %s", "json"),
990  errdetail("Unicode low surrogate must follow a high surrogate."),
991  report_json_context(lex)));
992 
993  /* Hooray, we found the end of the string! */
995  lex->token_terminator = s + 1;
996 }
997 
998 /*
999  * The next token in the input stream is known to be a number; lex it.
1000  *
1001  * In JSON, a number consists of four parts:
1002  *
1003  * (1) An optional minus sign ('-').
1004  *
1005  * (2) Either a single '0', or a string of one or more digits that does not
1006  * begin with a '0'.
1007  *
1008  * (3) An optional decimal part, consisting of a period ('.') followed by
1009  * one or more digits. (Note: While this part can be omitted
1010  * completely, it's not OK to have only the decimal point without
1011  * any digits afterwards.)
1012  *
1013  * (4) An optional exponent part, consisting of 'e' or 'E', optionally
1014  * followed by '+' or '-', followed by one or more digits. (Note:
1015  * As with the decimal part, if 'e' or 'E' is present, it must be
1016  * followed by at least one digit.)
1017  *
1018  * The 's' argument to this function points to the ostensible beginning
1019  * of part 2 - i.e. the character after any optional minus sign, or the
1020  * first character of the string if there is none.
1021  *
1022  * If num_err is not NULL, we return an error flag to *num_err rather than
1023  * raising an error for a badly-formed number. Also, if total_len is not NULL
1024  * the distance from lex->input to the token end+1 is returned to *total_len.
1025  */
1026 static inline void
1028  bool *num_err, int *total_len)
1029 {
1030  bool error = false;
1031  int len = s - lex->input;
1032 
1033  /* Part (1): leading sign indicator. */
1034  /* Caller already did this for us; so do nothing. */
1035 
1036  /* Part (2): parse main digit string. */
1037  if (len < lex->input_length && *s == '0')
1038  {
1039  s++;
1040  len++;
1041  }
1042  else if (len < lex->input_length && *s >= '1' && *s <= '9')
1043  {
1044  do
1045  {
1046  s++;
1047  len++;
1048  } while (len < lex->input_length && *s >= '0' && *s <= '9');
1049  }
1050  else
1051  error = true;
1052 
1053  /* Part (3): parse optional decimal portion. */
1054  if (len < lex->input_length && *s == '.')
1055  {
1056  s++;
1057  len++;
1058  if (len == lex->input_length || *s < '0' || *s > '9')
1059  error = true;
1060  else
1061  {
1062  do
1063  {
1064  s++;
1065  len++;
1066  } while (len < lex->input_length && *s >= '0' && *s <= '9');
1067  }
1068  }
1069 
1070  /* Part (4): parse optional exponent. */
1071  if (len < lex->input_length && (*s == 'e' || *s == 'E'))
1072  {
1073  s++;
1074  len++;
1075  if (len < lex->input_length && (*s == '+' || *s == '-'))
1076  {
1077  s++;
1078  len++;
1079  }
1080  if (len == lex->input_length || *s < '0' || *s > '9')
1081  error = true;
1082  else
1083  {
1084  do
1085  {
1086  s++;
1087  len++;
1088  } while (len < lex->input_length && *s >= '0' && *s <= '9');
1089  }
1090  }
1091 
1092  /*
1093  * Check for trailing garbage. As in json_lex(), any alphanumeric stuff
1094  * here should be considered part of the token for error-reporting
1095  * purposes.
1096  */
1097  for (; len < lex->input_length && JSON_ALPHANUMERIC_CHAR(*s); s++, len++)
1098  error = true;
1099 
1100  if (total_len != NULL)
1101  *total_len = len;
1102 
1103  if (num_err != NULL)
1104  {
1105  /* let the caller handle any error */
1106  *num_err = error;
1107  }
1108  else
1109  {
1110  /* return token endpoint */
1112  lex->token_terminator = s;
1113  /* handle error if any */
1114  if (error)
1115  report_invalid_token(lex);
1116  }
1117 }
1118 
1119 /*
1120  * Report a parse error.
1121  *
1122  * lex->token_start and lex->token_terminator must identify the current token.
1123  */
1124 static void
1126 {
1127  char *token;
1128  int toklen;
1129 
1130  /* Handle case where the input ended prematurely. */
1131  if (lex->token_start == NULL || lex->token_type == JSON_TOKEN_END)
1132  ereport(ERROR,
1133  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
1134  errmsg("invalid input syntax for type %s", "json"),
1135  errdetail("The input string ended unexpectedly."),
1136  report_json_context(lex)));
1137 
1138  /* Separate out the current token. */
1139  toklen = lex->token_terminator - lex->token_start;
1140  token = palloc(toklen + 1);
1141  memcpy(token, lex->token_start, toklen);
1142  token[toklen] = '\0';
1143 
1144  /* Complain, with the appropriate detail message. */
1145  if (ctx == JSON_PARSE_END)
1146  ereport(ERROR,
1147  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
1148  errmsg("invalid input syntax for type %s", "json"),
1149  errdetail("Expected end of input, but found \"%s\".",
1150  token),
1151  report_json_context(lex)));
1152  else
1153  {
1154  switch (ctx)
1155  {
1156  case JSON_PARSE_VALUE:
1157  ereport(ERROR,
1158  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
1159  errmsg("invalid input syntax for type %s", "json"),
1160  errdetail("Expected JSON value, but found \"%s\".",
1161  token),
1162  report_json_context(lex)));
1163  break;
1164  case JSON_PARSE_STRING:
1165  ereport(ERROR,
1166  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
1167  errmsg("invalid input syntax for type %s", "json"),
1168  errdetail("Expected string, but found \"%s\".",
1169  token),
1170  report_json_context(lex)));
1171  break;
1173  ereport(ERROR,
1174  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
1175  errmsg("invalid input syntax for type %s", "json"),
1176  errdetail("Expected array element or \"]\", but found \"%s\".",
1177  token),
1178  report_json_context(lex)));
1179  break;
1180  case JSON_PARSE_ARRAY_NEXT:
1181  ereport(ERROR,
1182  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
1183  errmsg("invalid input syntax for type %s", "json"),
1184  errdetail("Expected \",\" or \"]\", but found \"%s\".",
1185  token),
1186  report_json_context(lex)));
1187  break;
1189  ereport(ERROR,
1190  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
1191  errmsg("invalid input syntax for type %s", "json"),
1192  errdetail("Expected string or \"}\", but found \"%s\".",
1193  token),
1194  report_json_context(lex)));
1195  break;
1197  ereport(ERROR,
1198  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
1199  errmsg("invalid input syntax for type %s", "json"),
1200  errdetail("Expected \":\", but found \"%s\".",
1201  token),
1202  report_json_context(lex)));
1203  break;
1205  ereport(ERROR,
1206  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
1207  errmsg("invalid input syntax for type %s", "json"),
1208  errdetail("Expected \",\" or \"}\", but found \"%s\".",
1209  token),
1210  report_json_context(lex)));
1211  break;
1213  ereport(ERROR,
1214  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
1215  errmsg("invalid input syntax for type %s", "json"),
1216  errdetail("Expected string, but found \"%s\".",
1217  token),
1218  report_json_context(lex)));
1219  break;
1220  default:
1221  elog(ERROR, "unexpected json parse state: %d", ctx);
1222  }
1223  }
1224 }
1225 
1226 /*
1227  * Report an invalid input token.
1228  *
1229  * lex->token_start and lex->token_terminator must identify the token.
1230  */
1231 static void
1233 {
1234  char *token;
1235  int toklen;
1236 
1237  /* Separate out the offending token. */
1238  toklen = lex->token_terminator - lex->token_start;
1239  token = palloc(toklen + 1);
1240  memcpy(token, lex->token_start, toklen);
1241  token[toklen] = '\0';
1242 
1243  ereport(ERROR,
1244  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
1245  errmsg("invalid input syntax for type %s", "json"),
1246  errdetail("Token \"%s\" is invalid.", token),
1247  report_json_context(lex)));
1248 }
1249 
1250 /*
1251  * Report a CONTEXT line for bogus JSON input.
1252  *
1253  * lex->token_terminator must be set to identify the spot where we detected
1254  * the error. Note that lex->token_start might be NULL, in case we recognized
1255  * error at EOF.
1256  *
1257  * The return value isn't meaningful, but we make it non-void so that this
1258  * can be invoked inside ereport().
1259  */
1260 static int
1262 {
1263  const char *context_start;
1264  const char *context_end;
1265  const char *line_start;
1266  int line_number;
1267  char *ctxt;
1268  int ctxtlen;
1269  const char *prefix;
1270  const char *suffix;
1271 
1272  /* Choose boundaries for the part of the input we will display */
1273  context_start = lex->input;
1274  context_end = lex->token_terminator;
1275  line_start = context_start;
1276  line_number = 1;
1277  for (;;)
1278  {
1279  /* Always advance over newlines */
1280  if (context_start < context_end && *context_start == '\n')
1281  {
1282  context_start++;
1283  line_start = context_start;
1284  line_number++;
1285  continue;
1286  }
1287  /* Otherwise, done as soon as we are close enough to context_end */
1288  if (context_end - context_start < 50)
1289  break;
1290  /* Advance to next multibyte character */
1291  if (IS_HIGHBIT_SET(*context_start))
1292  context_start += pg_mblen(context_start);
1293  else
1294  context_start++;
1295  }
1296 
1297  /*
1298  * We add "..." to indicate that the excerpt doesn't start at the
1299  * beginning of the line ... but if we're within 3 characters of the
1300  * beginning of the line, we might as well just show the whole line.
1301  */
1302  if (context_start - line_start <= 3)
1303  context_start = line_start;
1304 
1305  /* Get a null-terminated copy of the data to present */
1306  ctxtlen = context_end - context_start;
1307  ctxt = palloc(ctxtlen + 1);
1308  memcpy(ctxt, context_start, ctxtlen);
1309  ctxt[ctxtlen] = '\0';
1310 
1311  /*
1312  * Show the context, prefixing "..." if not starting at start of line, and
1313  * suffixing "..." if not ending at end of line.
1314  */
1315  prefix = (context_start > line_start) ? "..." : "";
1316  suffix = (lex->token_type != JSON_TOKEN_END && context_end - lex->input < lex->input_length && *context_end != '\n' && *context_end != '\r') ? "..." : "";
1317 
1318  return errcontext("JSON data, line %d: %s%s%s",
1319  line_number, prefix, ctxt, suffix);
1320 }
1321 
1322 /*
1323  * Extract a single, possibly multi-byte char from the input string.
1324  */
1325 static char *
1327 {
1328  char *res;
1329  int len;
1330 
1331  len = pg_mblen(s);
1332  res = palloc(len + 1);
1333  memcpy(res, s, len);
1334  res[len] = '\0';
1335 
1336  return res;
1337 }
1338 
1339 /*
1340  * Determine how we want to print values of a given type in datum_to_json.
1341  *
1342  * Given the datatype OID, return its JsonTypeCategory, as well as the type's
1343  * output function OID. If the returned category is JSONTYPE_CAST, we
1344  * return the OID of the type->JSON cast function instead.
1345  */
1346 static void
1348  JsonTypeCategory *tcategory,
1349  Oid *outfuncoid)
1350 {
1351  bool typisvarlena;
1352 
1353  /* Look through any domain */
1354  typoid = getBaseType(typoid);
1355 
1356  *outfuncoid = InvalidOid;
1357 
1358  /*
1359  * We need to get the output function for everything except date and
1360  * timestamp types, array and composite types, booleans, and non-builtin
1361  * types where there's a cast to json.
1362  */
1363 
1364  switch (typoid)
1365  {
1366  case BOOLOID:
1367  *tcategory = JSONTYPE_BOOL;
1368  break;
1369 
1370  case INT2OID:
1371  case INT4OID:
1372  case INT8OID:
1373  case FLOAT4OID:
1374  case FLOAT8OID:
1375  case NUMERICOID:
1376  getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
1377  *tcategory = JSONTYPE_NUMERIC;
1378  break;
1379 
1380  case DATEOID:
1381  *tcategory = JSONTYPE_DATE;
1382  break;
1383 
1384  case TIMESTAMPOID:
1385  *tcategory = JSONTYPE_TIMESTAMP;
1386  break;
1387 
1388  case TIMESTAMPTZOID:
1389  *tcategory = JSONTYPE_TIMESTAMPTZ;
1390  break;
1391 
1392  case JSONOID:
1393  case JSONBOID:
1394  getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
1395  *tcategory = JSONTYPE_JSON;
1396  break;
1397 
1398  default:
1399  /* Check for arrays and composites */
1400  if (OidIsValid(get_element_type(typoid)) || typoid == ANYARRAYOID
1401  || typoid == RECORDARRAYOID)
1402  *tcategory = JSONTYPE_ARRAY;
1403  else if (type_is_rowtype(typoid)) /* includes RECORDOID */
1404  *tcategory = JSONTYPE_COMPOSITE;
1405  else
1406  {
1407  /* It's probably the general case ... */
1408  *tcategory = JSONTYPE_OTHER;
1409  /* but let's look for a cast to json, if it's not built-in */
1410  if (typoid >= FirstNormalObjectId)
1411  {
1412  Oid castfunc;
1413  CoercionPathType ctype;
1414 
1415  ctype = find_coercion_pathway(JSONOID, typoid,
1417  &castfunc);
1418  if (ctype == COERCION_PATH_FUNC && OidIsValid(castfunc))
1419  {
1420  *tcategory = JSONTYPE_CAST;
1421  *outfuncoid = castfunc;
1422  }
1423  else
1424  {
1425  /* non builtin type with no cast */
1426  getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
1427  }
1428  }
1429  else
1430  {
1431  /* any other builtin type */
1432  getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
1433  }
1434  }
1435  break;
1436  }
1437 }
1438 
1439 /*
1440  * Turn a Datum into JSON text, appending the string to "result".
1441  *
1442  * tcategory and outfuncoid are from a previous call to json_categorize_type,
1443  * except that if is_null is true then they can be invalid.
1444  *
1445  * If key_scalar is true, the value is being printed as a key, so insist
1446  * it's of an acceptable type, and force it to be quoted.
1447  */
1448 static void
1450  JsonTypeCategory tcategory, Oid outfuncoid,
1451  bool key_scalar)
1452 {
1453  char *outputstr;
1454  text *jsontext;
1455 
1457 
1458  /* callers are expected to ensure that null keys are not passed in */
1459  Assert(!(key_scalar && is_null));
1460 
1461  if (is_null)
1462  {
1463  appendStringInfoString(result, "null");
1464  return;
1465  }
1466 
1467  if (key_scalar &&
1468  (tcategory == JSONTYPE_ARRAY ||
1469  tcategory == JSONTYPE_COMPOSITE ||
1470  tcategory == JSONTYPE_JSON ||
1471  tcategory == JSONTYPE_CAST))
1472  ereport(ERROR,
1473  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1474  errmsg("key value must be scalar, not array, composite, or json")));
1475 
1476  switch (tcategory)
1477  {
1478  case JSONTYPE_ARRAY:
1479  array_to_json_internal(val, result, false);
1480  break;
1481  case JSONTYPE_COMPOSITE:
1482  composite_to_json(val, result, false);
1483  break;
1484  case JSONTYPE_BOOL:
1485  outputstr = DatumGetBool(val) ? "true" : "false";
1486  if (key_scalar)
1487  escape_json(result, outputstr);
1488  else
1489  appendStringInfoString(result, outputstr);
1490  break;
1491  case JSONTYPE_NUMERIC:
1492  outputstr = OidOutputFunctionCall(outfuncoid, val);
1493 
1494  /*
1495  * Don't call escape_json for a non-key if it's a valid JSON
1496  * number.
1497  */
1498  if (!key_scalar && IsValidJsonNumber(outputstr, strlen(outputstr)))
1499  appendStringInfoString(result, outputstr);
1500  else
1501  escape_json(result, outputstr);
1502  pfree(outputstr);
1503  break;
1504  case JSONTYPE_DATE:
1505  {
1506  DateADT date;
1507  struct pg_tm tm;
1508  char buf[MAXDATELEN + 1];
1509 
1510  date = DatumGetDateADT(val);
1511  /* Same as date_out(), but forcing DateStyle */
1512  if (DATE_NOT_FINITE(date))
1513  EncodeSpecialDate(date, buf);
1514  else
1515  {
1517  &(tm.tm_year), &(tm.tm_mon), &(tm.tm_mday));
1518  EncodeDateOnly(&tm, USE_XSD_DATES, buf);
1519  }
1520  appendStringInfo(result, "\"%s\"", buf);
1521  }
1522  break;
1523  case JSONTYPE_TIMESTAMP:
1524  {
1526  struct pg_tm tm;
1527  fsec_t fsec;
1528  char buf[MAXDATELEN + 1];
1529 
1530  timestamp = DatumGetTimestamp(val);
1531  /* Same as timestamp_out(), but forcing DateStyle */
1532  if (TIMESTAMP_NOT_FINITE(timestamp))
1533  EncodeSpecialTimestamp(timestamp, buf);
1534  else if (timestamp2tm(timestamp, NULL, &tm, &fsec, NULL, NULL) == 0)
1535  EncodeDateTime(&tm, fsec, false, 0, NULL, USE_XSD_DATES, buf);
1536  else
1537  ereport(ERROR,
1538  (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
1539  errmsg("timestamp out of range")));
1540  appendStringInfo(result, "\"%s\"", buf);
1541  }
1542  break;
1543  case JSONTYPE_TIMESTAMPTZ:
1544  {
1546  struct pg_tm tm;
1547  int tz;
1548  fsec_t fsec;
1549  const char *tzn = NULL;
1550  char buf[MAXDATELEN + 1];
1551 
1552  timestamp = DatumGetTimestampTz(val);
1553  /* Same as timestamptz_out(), but forcing DateStyle */
1554  if (TIMESTAMP_NOT_FINITE(timestamp))
1555  EncodeSpecialTimestamp(timestamp, buf);
1556  else if (timestamp2tm(timestamp, &tz, &tm, &fsec, &tzn, NULL) == 0)
1557  EncodeDateTime(&tm, fsec, true, tz, tzn, USE_XSD_DATES, buf);
1558  else
1559  ereport(ERROR,
1560  (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
1561  errmsg("timestamp out of range")));
1562  appendStringInfo(result, "\"%s\"", buf);
1563  }
1564  break;
1565  case JSONTYPE_JSON:
1566  /* JSON and JSONB output will already be escaped */
1567  outputstr = OidOutputFunctionCall(outfuncoid, val);
1568  appendStringInfoString(result, outputstr);
1569  pfree(outputstr);
1570  break;
1571  case JSONTYPE_CAST:
1572  /* outfuncoid refers to a cast function, not an output function */
1573  jsontext = DatumGetTextPP(OidFunctionCall1(outfuncoid, val));
1574  outputstr = text_to_cstring(jsontext);
1575  appendStringInfoString(result, outputstr);
1576  pfree(outputstr);
1577  pfree(jsontext);
1578  break;
1579  default:
1580  outputstr = OidOutputFunctionCall(outfuncoid, val);
1581  escape_json(result, outputstr);
1582  pfree(outputstr);
1583  break;
1584  }
1585 }
1586 
1587 /*
1588  * Process a single dimension of an array.
1589  * If it's the innermost dimension, output the values, otherwise call
1590  * ourselves recursively to process the next dimension.
1591  */
1592 static void
1593 array_dim_to_json(StringInfo result, int dim, int ndims, int *dims, Datum *vals,
1594  bool *nulls, int *valcount, JsonTypeCategory tcategory,
1595  Oid outfuncoid, bool use_line_feeds)
1596 {
1597  int i;
1598  const char *sep;
1599 
1600  Assert(dim < ndims);
1601 
1602  sep = use_line_feeds ? ",\n " : ",";
1603 
1604  appendStringInfoChar(result, '[');
1605 
1606  for (i = 1; i <= dims[dim]; i++)
1607  {
1608  if (i > 1)
1609  appendStringInfoString(result, sep);
1610 
1611  if (dim + 1 == ndims)
1612  {
1613  datum_to_json(vals[*valcount], nulls[*valcount], result, tcategory,
1614  outfuncoid, false);
1615  (*valcount)++;
1616  }
1617  else
1618  {
1619  /*
1620  * Do we want line feeds on inner dimensions of arrays? For now
1621  * we'll say no.
1622  */
1623  array_dim_to_json(result, dim + 1, ndims, dims, vals, nulls,
1624  valcount, tcategory, outfuncoid, false);
1625  }
1626  }
1627 
1628  appendStringInfoChar(result, ']');
1629 }
1630 
1631 /*
1632  * Turn an array into JSON.
1633  */
1634 static void
1635 array_to_json_internal(Datum array, StringInfo result, bool use_line_feeds)
1636 {
1637  ArrayType *v = DatumGetArrayTypeP(array);
1638  Oid element_type = ARR_ELEMTYPE(v);
1639  int *dim;
1640  int ndim;
1641  int nitems;
1642  int count = 0;
1643  Datum *elements;
1644  bool *nulls;
1645  int16 typlen;
1646  bool typbyval;
1647  char typalign;
1648  JsonTypeCategory tcategory;
1649  Oid outfuncoid;
1650 
1651  ndim = ARR_NDIM(v);
1652  dim = ARR_DIMS(v);
1653  nitems = ArrayGetNItems(ndim, dim);
1654 
1655  if (nitems <= 0)
1656  {
1657  appendStringInfoString(result, "[]");
1658  return;
1659  }
1660 
1661  get_typlenbyvalalign(element_type,
1662  &typlen, &typbyval, &typalign);
1663 
1664  json_categorize_type(element_type,
1665  &tcategory, &outfuncoid);
1666 
1667  deconstruct_array(v, element_type, typlen, typbyval,
1668  typalign, &elements, &nulls,
1669  &nitems);
1670 
1671  array_dim_to_json(result, 0, ndim, dim, elements, nulls, &count, tcategory,
1672  outfuncoid, use_line_feeds);
1673 
1674  pfree(elements);
1675  pfree(nulls);
1676 }
1677 
1678 /*
1679  * Turn a composite / record into JSON.
1680  */
1681 static void
1682 composite_to_json(Datum composite, StringInfo result, bool use_line_feeds)
1683 {
1684  HeapTupleHeader td;
1685  Oid tupType;
1686  int32 tupTypmod;
1687  TupleDesc tupdesc;
1688  HeapTupleData tmptup,
1689  *tuple;
1690  int i;
1691  bool needsep = false;
1692  const char *sep;
1693 
1694  sep = use_line_feeds ? ",\n " : ",";
1695 
1696  td = DatumGetHeapTupleHeader(composite);
1697 
1698  /* Extract rowtype info and find a tupdesc */
1699  tupType = HeapTupleHeaderGetTypeId(td);
1700  tupTypmod = HeapTupleHeaderGetTypMod(td);
1701  tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
1702 
1703  /* Build a temporary HeapTuple control structure */
1704  tmptup.t_len = HeapTupleHeaderGetDatumLength(td);
1705  tmptup.t_data = td;
1706  tuple = &tmptup;
1707 
1708  appendStringInfoChar(result, '{');
1709 
1710  for (i = 0; i < tupdesc->natts; i++)
1711  {
1712  Datum val;
1713  bool isnull;
1714  char *attname;
1715  JsonTypeCategory tcategory;
1716  Oid outfuncoid;
1717  Form_pg_attribute att = TupleDescAttr(tupdesc, i);
1718 
1719  if (att->attisdropped)
1720  continue;
1721 
1722  if (needsep)
1723  appendStringInfoString(result, sep);
1724  needsep = true;
1725 
1726  attname = NameStr(att->attname);
1727  escape_json(result, attname);
1728  appendStringInfoChar(result, ':');
1729 
1730  val = heap_getattr(tuple, i + 1, tupdesc, &isnull);
1731 
1732  if (isnull)
1733  {
1734  tcategory = JSONTYPE_NULL;
1735  outfuncoid = InvalidOid;
1736  }
1737  else
1738  json_categorize_type(att->atttypid, &tcategory, &outfuncoid);
1739 
1740  datum_to_json(val, isnull, result, tcategory, outfuncoid, false);
1741  }
1742 
1743  appendStringInfoChar(result, '}');
1744  ReleaseTupleDesc(tupdesc);
1745 }
1746 
1747 /*
1748  * Append JSON text for "val" to "result".
1749  *
1750  * This is just a thin wrapper around datum_to_json. If the same type will be
1751  * printed many times, avoid using this; better to do the json_categorize_type
1752  * lookups only once.
1753  */
1754 static void
1756  Oid val_type, bool key_scalar)
1757 {
1758  JsonTypeCategory tcategory;
1759  Oid outfuncoid;
1760 
1761  if (val_type == InvalidOid)
1762  ereport(ERROR,
1763  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1764  errmsg("could not determine input data type")));
1765 
1766  if (is_null)
1767  {
1768  tcategory = JSONTYPE_NULL;
1769  outfuncoid = InvalidOid;
1770  }
1771  else
1772  json_categorize_type(val_type,
1773  &tcategory, &outfuncoid);
1774 
1775  datum_to_json(val, is_null, result, tcategory, outfuncoid, key_scalar);
1776 }
1777 
1778 /*
1779  * SQL function array_to_json(row)
1780  */
1781 extern Datum
1783 {
1784  Datum array = PG_GETARG_DATUM(0);
1786 
1787  result = makeStringInfo();
1788 
1789  array_to_json_internal(array, result, false);
1790 
1792 }
1793 
1794 /*
1795  * SQL function array_to_json(row, prettybool)
1796  */
1797 extern Datum
1799 {
1800  Datum array = PG_GETARG_DATUM(0);
1801  bool use_line_feeds = PG_GETARG_BOOL(1);
1803 
1804  result = makeStringInfo();
1805 
1806  array_to_json_internal(array, result, use_line_feeds);
1807 
1809 }
1810 
1811 /*
1812  * SQL function row_to_json(row)
1813  */
1814 extern Datum
1816 {
1817  Datum array = PG_GETARG_DATUM(0);
1819 
1820  result = makeStringInfo();
1821 
1822  composite_to_json(array, result, false);
1823 
1825 }
1826 
1827 /*
1828  * SQL function row_to_json(row, prettybool)
1829  */
1830 extern Datum
1832 {
1833  Datum array = PG_GETARG_DATUM(0);
1834  bool use_line_feeds = PG_GETARG_BOOL(1);
1836 
1837  result = makeStringInfo();
1838 
1839  composite_to_json(array, result, use_line_feeds);
1840 
1842 }
1843 
1844 /*
1845  * SQL function to_json(anyvalue)
1846  */
1847 Datum
1849 {
1850  Datum val = PG_GETARG_DATUM(0);
1851  Oid val_type = get_fn_expr_argtype(fcinfo->flinfo, 0);
1853  JsonTypeCategory tcategory;
1854  Oid outfuncoid;
1855 
1856  if (val_type == InvalidOid)
1857  ereport(ERROR,
1858  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1859  errmsg("could not determine input data type")));
1860 
1861  json_categorize_type(val_type,
1862  &tcategory, &outfuncoid);
1863 
1864  result = makeStringInfo();
1865 
1866  datum_to_json(val, false, result, tcategory, outfuncoid, false);
1867 
1869 }
1870 
1871 /*
1872  * json_agg transition function
1873  *
1874  * aggregate input column as a json array value.
1875  */
1876 Datum
1878 {
1879  MemoryContext aggcontext,
1880  oldcontext;
1882  Datum val;
1883 
1884  if (!AggCheckCallContext(fcinfo, &aggcontext))
1885  {
1886  /* cannot be called directly because of internal-type argument */
1887  elog(ERROR, "json_agg_transfn called in non-aggregate context");
1888  }
1889 
1890  if (PG_ARGISNULL(0))
1891  {
1892  Oid arg_type = get_fn_expr_argtype(fcinfo->flinfo, 1);
1893 
1894  if (arg_type == InvalidOid)
1895  ereport(ERROR,
1896  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1897  errmsg("could not determine input data type")));
1898 
1899  /*
1900  * Make this state object in a context where it will persist for the
1901  * duration of the aggregate call. MemoryContextSwitchTo is only
1902  * needed the first time, as the StringInfo routines make sure they
1903  * use the right context to enlarge the object if necessary.
1904  */
1905  oldcontext = MemoryContextSwitchTo(aggcontext);
1906  state = (JsonAggState *) palloc(sizeof(JsonAggState));
1907  state->str = makeStringInfo();
1908  MemoryContextSwitchTo(oldcontext);
1909 
1910  appendStringInfoChar(state->str, '[');
1911  json_categorize_type(arg_type, &state->val_category,
1912  &state->val_output_func);
1913  }
1914  else
1915  {
1916  state = (JsonAggState *) PG_GETARG_POINTER(0);
1917  appendStringInfoString(state->str, ", ");
1918  }
1919 
1920  /* fast path for NULLs */
1921  if (PG_ARGISNULL(1))
1922  {
1923  datum_to_json((Datum) 0, true, state->str, JSONTYPE_NULL,
1924  InvalidOid, false);
1925  PG_RETURN_POINTER(state);
1926  }
1927 
1928  val = PG_GETARG_DATUM(1);
1929 
1930  /* add some whitespace if structured type and not first item */
1931  if (!PG_ARGISNULL(0) &&
1932  (state->val_category == JSONTYPE_ARRAY ||
1933  state->val_category == JSONTYPE_COMPOSITE))
1934  {
1935  appendStringInfoString(state->str, "\n ");
1936  }
1937 
1938  datum_to_json(val, false, state->str, state->val_category,
1939  state->val_output_func, false);
1940 
1941  /*
1942  * The transition type for array_agg() is declared to be "internal", which
1943  * is a pass-by-value type the same size as a pointer. So we can safely
1944  * pass the JsonAggState pointer through nodeAgg.c's machinations.
1945  */
1946  PG_RETURN_POINTER(state);
1947 }
1948 
1949 /*
1950  * json_agg final function
1951  */
1952 Datum
1954 {
1956 
1957  /* cannot be called directly because of internal-type argument */
1958  Assert(AggCheckCallContext(fcinfo, NULL));
1959 
1960  state = PG_ARGISNULL(0) ?
1961  NULL :
1963 
1964  /* NULL result for no rows in, as is standard with aggregates */
1965  if (state == NULL)
1966  PG_RETURN_NULL();
1967 
1968  /* Else return state with appropriate array terminator added */
1970 }
1971 
1972 /*
1973  * json_object_agg transition function.
1974  *
1975  * aggregate two input columns as a single json object value.
1976  */
1977 Datum
1979 {
1980  MemoryContext aggcontext,
1981  oldcontext;
1983  Datum arg;
1984 
1985  if (!AggCheckCallContext(fcinfo, &aggcontext))
1986  {
1987  /* cannot be called directly because of internal-type argument */
1988  elog(ERROR, "json_object_agg_transfn called in non-aggregate context");
1989  }
1990 
1991  if (PG_ARGISNULL(0))
1992  {
1993  Oid arg_type;
1994 
1995  /*
1996  * Make the StringInfo in a context where it will persist for the
1997  * duration of the aggregate call. Switching context is only needed
1998  * for this initial step, as the StringInfo routines make sure they
1999  * use the right context to enlarge the object if necessary.
2000  */
2001  oldcontext = MemoryContextSwitchTo(aggcontext);
2002  state = (JsonAggState *) palloc(sizeof(JsonAggState));
2003  state->str = makeStringInfo();
2004  MemoryContextSwitchTo(oldcontext);
2005 
2006  arg_type = get_fn_expr_argtype(fcinfo->flinfo, 1);
2007 
2008  if (arg_type == InvalidOid)
2009  ereport(ERROR,
2010  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2011  errmsg("could not determine data type for argument %d", 1)));
2012 
2013  json_categorize_type(arg_type, &state->key_category,
2014  &state->key_output_func);
2015 
2016  arg_type = get_fn_expr_argtype(fcinfo->flinfo, 2);
2017 
2018  if (arg_type == InvalidOid)
2019  ereport(ERROR,
2020  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2021  errmsg("could not determine data type for argument %d", 2)));
2022 
2023  json_categorize_type(arg_type, &state->val_category,
2024  &state->val_output_func);
2025 
2026  appendStringInfoString(state->str, "{ ");
2027  }
2028  else
2029  {
2030  state = (JsonAggState *) PG_GETARG_POINTER(0);
2031  appendStringInfoString(state->str, ", ");
2032  }
2033 
2034  /*
2035  * Note: since json_object_agg() is declared as taking type "any", the
2036  * parser will not do any type conversion on unknown-type literals (that
2037  * is, undecorated strings or NULLs). Such values will arrive here as
2038  * type UNKNOWN, which fortunately does not matter to us, since
2039  * unknownout() works fine.
2040  */
2041 
2042  if (PG_ARGISNULL(1))
2043  ereport(ERROR,
2044  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2045  errmsg("field name must not be null")));
2046 
2047  arg = PG_GETARG_DATUM(1);
2048 
2049  datum_to_json(arg, false, state->str, state->key_category,
2050  state->key_output_func, true);
2051 
2052  appendStringInfoString(state->str, " : ");
2053 
2054  if (PG_ARGISNULL(2))
2055  arg = (Datum) 0;
2056  else
2057  arg = PG_GETARG_DATUM(2);
2058 
2059  datum_to_json(arg, PG_ARGISNULL(2), state->str, state->val_category,
2060  state->val_output_func, false);
2061 
2062  PG_RETURN_POINTER(state);
2063 }
2064 
2065 /*
2066  * json_object_agg final function.
2067  */
2068 Datum
2070 {
2072 
2073  /* cannot be called directly because of internal-type argument */
2074  Assert(AggCheckCallContext(fcinfo, NULL));
2075 
2076  state = PG_ARGISNULL(0) ? NULL : (JsonAggState *) PG_GETARG_POINTER(0);
2077 
2078  /* NULL result for no rows in, as is standard with aggregates */
2079  if (state == NULL)
2080  PG_RETURN_NULL();
2081 
2082  /* Else return state with appropriate object terminator added */
2084 }
2085 
2086 /*
2087  * Helper function for aggregates: return given StringInfo's contents plus
2088  * specified trailing string, as a text datum. We need this because aggregate
2089  * final functions are not allowed to modify the aggregate state.
2090  */
2091 static text *
2093 {
2094  /* custom version of cstring_to_text_with_len */
2095  int buflen = buffer->len;
2096  int addlen = strlen(addon);
2097  text *result = (text *) palloc(buflen + addlen + VARHDRSZ);
2098 
2099  SET_VARSIZE(result, buflen + addlen + VARHDRSZ);
2100  memcpy(VARDATA(result), buffer->data, buflen);
2101  memcpy(VARDATA(result) + buflen, addon, addlen);
2102 
2103  return result;
2104 }
2105 
2106 /*
2107  * SQL function json_build_object(variadic "any")
2108  */
2109 Datum
2111 {
2112  int nargs = PG_NARGS();
2113  int i;
2114  Datum arg;
2115  const char *sep = "";
2117  Oid val_type;
2118 
2119  if (nargs % 2 != 0)
2120  ereport(ERROR,
2121  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2122  errmsg("argument list must have even number of elements"),
2123  errhint("The arguments of json_build_object() must consist of alternating keys and values.")));
2124 
2125  result = makeStringInfo();
2126 
2127  appendStringInfoChar(result, '{');
2128 
2129  for (i = 0; i < nargs; i += 2)
2130  {
2131  /*
2132  * Note: since json_build_object() is declared as taking type "any",
2133  * the parser will not do any type conversion on unknown-type literals
2134  * (that is, undecorated strings or NULLs). Such values will arrive
2135  * here as type UNKNOWN, which fortunately does not matter to us,
2136  * since unknownout() works fine.
2137  */
2138  appendStringInfoString(result, sep);
2139  sep = ", ";
2140 
2141  /* process key */
2142  val_type = get_fn_expr_argtype(fcinfo->flinfo, i);
2143 
2144  if (val_type == InvalidOid)
2145  ereport(ERROR,
2146  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2147  errmsg("could not determine data type for argument %d",
2148  i + 1)));
2149 
2150  if (PG_ARGISNULL(i))
2151  ereport(ERROR,
2152  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2153  errmsg("argument %d cannot be null", i + 1),
2154  errhint("Object keys should be text.")));
2155 
2156  arg = PG_GETARG_DATUM(i);
2157 
2158  add_json(arg, false, result, val_type, true);
2159 
2160  appendStringInfoString(result, " : ");
2161 
2162  /* process value */
2163  val_type = get_fn_expr_argtype(fcinfo->flinfo, i + 1);
2164 
2165  if (val_type == InvalidOid)
2166  ereport(ERROR,
2167  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2168  errmsg("could not determine data type for argument %d",
2169  i + 2)));
2170 
2171  if (PG_ARGISNULL(i + 1))
2172  arg = (Datum) 0;
2173  else
2174  arg = PG_GETARG_DATUM(i + 1);
2175 
2176  add_json(arg, PG_ARGISNULL(i + 1), result, val_type, false);
2177  }
2178 
2179  appendStringInfoChar(result, '}');
2180 
2182 }
2183 
2184 /*
2185  * degenerate case of json_build_object where it gets 0 arguments.
2186  */
2187 Datum
2189 {
2191 }
2192 
2193 /*
2194  * SQL function json_build_array(variadic "any")
2195  */
2196 Datum
2198 {
2199  int nargs = PG_NARGS();
2200  int i;
2201  Datum arg;
2202  const char *sep = "";
2204  Oid val_type;
2205 
2206  result = makeStringInfo();
2207 
2208  appendStringInfoChar(result, '[');
2209 
2210  for (i = 0; i < nargs; i++)
2211  {
2212  /*
2213  * Note: since json_build_array() is declared as taking type "any",
2214  * the parser will not do any type conversion on unknown-type literals
2215  * (that is, undecorated strings or NULLs). Such values will arrive
2216  * here as type UNKNOWN, which fortunately does not matter to us,
2217  * since unknownout() works fine.
2218  */
2219  appendStringInfoString(result, sep);
2220  sep = ", ";
2221 
2222  val_type = get_fn_expr_argtype(fcinfo->flinfo, i);
2223 
2224  if (val_type == InvalidOid)
2225  ereport(ERROR,
2226  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2227  errmsg("could not determine data type for argument %d",
2228  i + 1)));
2229 
2230  if (PG_ARGISNULL(i))
2231  arg = (Datum) 0;
2232  else
2233  arg = PG_GETARG_DATUM(i);
2234 
2235  add_json(arg, PG_ARGISNULL(i), result, val_type, false);
2236  }
2237 
2238  appendStringInfoChar(result, ']');
2239 
2241 }
2242 
2243 /*
2244  * degenerate case of json_build_array where it gets 0 arguments.
2245  */
2246 Datum
2248 {
2250 }
2251 
2252 /*
2253  * SQL function json_object(text[])
2254  *
2255  * take a one or two dimensional array of text as key/value pairs
2256  * for a json object.
2257  */
2258 Datum
2260 {
2261  ArrayType *in_array = PG_GETARG_ARRAYTYPE_P(0);
2262  int ndims = ARR_NDIM(in_array);
2264  Datum *in_datums;
2265  bool *in_nulls;
2266  int in_count,
2267  count,
2268  i;
2269  text *rval;
2270  char *v;
2271 
2272  switch (ndims)
2273  {
2274  case 0:
2276  break;
2277 
2278  case 1:
2279  if ((ARR_DIMS(in_array)[0]) % 2)
2280  ereport(ERROR,
2281  (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
2282  errmsg("array must have even number of elements")));
2283  break;
2284 
2285  case 2:
2286  if ((ARR_DIMS(in_array)[1]) != 2)
2287  ereport(ERROR,
2288  (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
2289  errmsg("array must have two columns")));
2290  break;
2291 
2292  default:
2293  ereport(ERROR,
2294  (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
2295  errmsg("wrong number of array subscripts")));
2296  }
2297 
2298  deconstruct_array(in_array,
2299  TEXTOID, -1, false, 'i',
2300  &in_datums, &in_nulls, &in_count);
2301 
2302  count = in_count / 2;
2303 
2304  initStringInfo(&result);
2305 
2306  appendStringInfoChar(&result, '{');
2307 
2308  for (i = 0; i < count; ++i)
2309  {
2310  if (in_nulls[i * 2])
2311  ereport(ERROR,
2312  (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
2313  errmsg("null value not allowed for object key")));
2314 
2315  v = TextDatumGetCString(in_datums[i * 2]);
2316  if (i > 0)
2317  appendStringInfoString(&result, ", ");
2318  escape_json(&result, v);
2319  appendStringInfoString(&result, " : ");
2320  pfree(v);
2321  if (in_nulls[i * 2 + 1])
2322  appendStringInfoString(&result, "null");
2323  else
2324  {
2325  v = TextDatumGetCString(in_datums[i * 2 + 1]);
2326  escape_json(&result, v);
2327  pfree(v);
2328  }
2329  }
2330 
2331  appendStringInfoChar(&result, '}');
2332 
2333  pfree(in_datums);
2334  pfree(in_nulls);
2335 
2336  rval = cstring_to_text_with_len(result.data, result.len);
2337  pfree(result.data);
2338 
2339  PG_RETURN_TEXT_P(rval);
2340 
2341 }
2342 
2343 /*
2344  * SQL function json_object(text[], text[])
2345  *
2346  * take separate key and value arrays of text to construct a json object
2347  * pairwise.
2348  */
2349 Datum
2351 {
2352  ArrayType *key_array = PG_GETARG_ARRAYTYPE_P(0);
2353  ArrayType *val_array = PG_GETARG_ARRAYTYPE_P(1);
2354  int nkdims = ARR_NDIM(key_array);
2355  int nvdims = ARR_NDIM(val_array);
2357  Datum *key_datums,
2358  *val_datums;
2359  bool *key_nulls,
2360  *val_nulls;
2361  int key_count,
2362  val_count,
2363  i;
2364  text *rval;
2365  char *v;
2366 
2367  if (nkdims > 1 || nkdims != nvdims)
2368  ereport(ERROR,
2369  (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
2370  errmsg("wrong number of array subscripts")));
2371 
2372  if (nkdims == 0)
2374 
2375  deconstruct_array(key_array,
2376  TEXTOID, -1, false, 'i',
2377  &key_datums, &key_nulls, &key_count);
2378 
2379  deconstruct_array(val_array,
2380  TEXTOID, -1, false, 'i',
2381  &val_datums, &val_nulls, &val_count);
2382 
2383  if (key_count != val_count)
2384  ereport(ERROR,
2385  (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
2386  errmsg("mismatched array dimensions")));
2387 
2388  initStringInfo(&result);
2389 
2390  appendStringInfoChar(&result, '{');
2391 
2392  for (i = 0; i < key_count; ++i)
2393  {
2394  if (key_nulls[i])
2395  ereport(ERROR,
2396  (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
2397  errmsg("null value not allowed for object key")));
2398 
2399  v = TextDatumGetCString(key_datums[i]);
2400  if (i > 0)
2401  appendStringInfoString(&result, ", ");
2402  escape_json(&result, v);
2403  appendStringInfoString(&result, " : ");
2404  pfree(v);
2405  if (val_nulls[i])
2406  appendStringInfoString(&result, "null");
2407  else
2408  {
2409  v = TextDatumGetCString(val_datums[i]);
2410  escape_json(&result, v);
2411  pfree(v);
2412  }
2413  }
2414 
2415  appendStringInfoChar(&result, '}');
2416 
2417  pfree(key_datums);
2418  pfree(key_nulls);
2419  pfree(val_datums);
2420  pfree(val_nulls);
2421 
2422  rval = cstring_to_text_with_len(result.data, result.len);
2423  pfree(result.data);
2424 
2425  PG_RETURN_TEXT_P(rval);
2426 }
2427 
2428 
2429 /*
2430  * Produce a JSON string literal, properly escaping characters in the text.
2431  */
2432 void
2433 escape_json(StringInfo buf, const char *str)
2434 {
2435  const char *p;
2436 
2437  appendStringInfoCharMacro(buf, '"');
2438  for (p = str; *p; p++)
2439  {
2440  switch (*p)
2441  {
2442  case '\b':
2443  appendStringInfoString(buf, "\\b");
2444  break;
2445  case '\f':
2446  appendStringInfoString(buf, "\\f");
2447  break;
2448  case '\n':
2449  appendStringInfoString(buf, "\\n");
2450  break;
2451  case '\r':
2452  appendStringInfoString(buf, "\\r");
2453  break;
2454  case '\t':
2455  appendStringInfoString(buf, "\\t");
2456  break;
2457  case '"':
2458  appendStringInfoString(buf, "\\\"");
2459  break;
2460  case '\\':
2461  appendStringInfoString(buf, "\\\\");
2462  break;
2463  default:
2464  if ((unsigned char) *p < ' ')
2465  appendStringInfo(buf, "\\u%04x", (int) *p);
2466  else
2467  appendStringInfoCharMacro(buf, *p);
2468  break;
2469  }
2470  }
2471  appendStringInfoCharMacro(buf, '"');
2472 }
2473 
2474 /*
2475  * SQL function json_typeof(json) -> text
2476  *
2477  * Returns the type of the outermost JSON value as TEXT. Possible types are
2478  * "object", "array", "string", "number", "boolean", and "null".
2479  *
2480  * Performs a single call to json_lex() to get the first token of the supplied
2481  * value. This initial token uniquely determines the value's type. As our
2482  * input must already have been validated by json_in() or json_recv(), the
2483  * initial token should never be JSON_TOKEN_OBJECT_END, JSON_TOKEN_ARRAY_END,
2484  * JSON_TOKEN_COLON, JSON_TOKEN_COMMA, or JSON_TOKEN_END.
2485  */
2486 Datum
2488 {
2489  text *json;
2490 
2491  JsonLexContext *lex;
2492  JsonTokenType tok;
2493  char *type;
2494 
2495  json = PG_GETARG_TEXT_PP(0);
2496  lex = makeJsonLexContext(json, false);
2497 
2498  /* Lex exactly one token from the input and check its type. */
2499  json_lex(lex);
2500  tok = lex_peek(lex);
2501  switch (tok)
2502  {
2504  type = "object";
2505  break;
2507  type = "array";
2508  break;
2509  case JSON_TOKEN_STRING:
2510  type = "string";
2511  break;
2512  case JSON_TOKEN_NUMBER:
2513  type = "number";
2514  break;
2515  case JSON_TOKEN_TRUE:
2516  case JSON_TOKEN_FALSE:
2517  type = "boolean";
2518  break;
2519  case JSON_TOKEN_NULL:
2520  type = "null";
2521  break;
2522  default:
2523  elog(ERROR, "unexpected json token: %d", tok);
2524  }
2525 
2527 }
#define MAXDATELEN
Definition: datetime.h:203
void EncodeDateOnly(struct pg_tm *tm, int style, char *str)
Definition: datetime.c:3884
json_struct_action array_end
Definition: jsonapi.h:88
#define RECORDARRAYOID
Definition: pg_type.h:682
#define TIMESTAMPTZOID
Definition: pg_type.h:525
signed short int16
Definition: c.h:255
#define PG_RETURN_POINTER(x)
Definition: fmgr.h:321
Datum to_json(PG_FUNCTION_ARGS)
Definition: json.c:1848
static void datum_to_json(Datum val, bool is_null, StringInfo result, JsonTypeCategory tcategory, Oid outfuncoid, bool key_scalar)
Definition: json.c:1449
#define DATEOID
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int line_number
Definition: jsonapi.h:60
#define DatumGetDateADT(X)
Definition: date.h:52
int errhint(const char *fmt,...)
Definition: elog.c:987
void getTypeOutputInfo(Oid type, Oid *typOutput, bool *typIsVarlena)
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#define VARDATA_ANY(PTR)
Definition: postgres.h:347
#define VARDATA(PTR)
Definition: postgres.h:303
unsigned char * unicode_to_utf8(pg_wchar c, unsigned char *utf8string)
Definition: wchar.c:475
void escape_json(StringInfo buf, const char *str)
Definition: json.c:2433
TupleDesc lookup_rowtype_tupdesc(Oid type_id, int32 typmod)
Definition: typcache.c:1251
static void error(void)
Definition: sql-dyntest.c:147
json_struct_action object_end
Definition: jsonapi.h:86
Datum json_object_two_arg(PG_FUNCTION_ARGS)
Definition: json.c:2350
int32 DateADT
Definition: date.h:22
#define TEXTOID
Definition: pg_type.h:324
static void json_categorize_type(Oid typoid, JsonTypeCategory *tcategory, Oid *outfuncoid)
Definition: json.c:1347
int64 timestamp
Oid get_element_type(Oid typid)
Definition: lsyscache.c:2484
int64 TimestampTz
Definition: timestamp.h:39
void get_typlenbyvalalign(Oid typid, int16 *typlen, bool *typbyval, char *typalign)
Definition: lsyscache.c:2021
static void composite_to_json(Datum composite, StringInfo result, bool use_line_feeds)
Definition: json.c:1682
#define PG_GETARG_DATUM(n)
Definition: fmgr.h:233
#define TupleDescAttr(tupdesc, i)
Definition: tupdesc.h:84
#define NUMERICOID
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Definition: pqformat.c:359
#define VARHDRSZ
Definition: c.h:445
#define JSONOID
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char * pstrdup(const char *in)
Definition: mcxt.c:1077
#define DatumGetTextPP(X)
Definition: fmgr.h:256
static void array_dim_to_json(StringInfo result, int dim, int ndims, int *dims, Datum *vals, bool *nulls, int *valcount, JsonTypeCategory tcategory, Oid outfuncoid, bool use_line_feeds)
Definition: json.c:1593
int timestamp2tm(Timestamp dt, int *tzp, struct pg_tm *tm, fsec_t *fsec, const char **tzn, pg_tz *attimezone)
Definition: timestamp.c:1758
Datum json_in(PG_FUNCTION_ARGS)
Definition: json.c:227
StringInfo makeStringInfo(void)
Definition: stringinfo.c:28
StringInfoData * StringInfo
Definition: stringinfo.h:43
JsonTokenType token_type
Definition: jsonapi.h:58
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Definition: arrayutils.c:75
json_struct_action object_start
Definition: jsonapi.h:85
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
char * prev_token_terminator
Definition: jsonapi.h:57
#define INT4OID
Definition: pg_type.h:316
static void lex_expect(JsonParseContext ctx, JsonLexContext *lex, JsonTokenType token)
Definition: json.c:172
#define JSON_ALPHANUMERIC_CHAR(c)
Definition: json.c:179
static char * extract_mb_char(char *s)
Definition: json.c:1326
Datum json_agg_finalfn(PG_FUNCTION_ARGS)
Definition: json.c:1953
Datum array_to_json_pretty(PG_FUNCTION_ARGS)
Definition: json.c:1798
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Definition: elog.c:575
void(* json_scalar_action)(void *state, char *token, JsonTokenType tokentype)
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json_scalar_action scalar
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Oid val_output_func
Definition: json.c:74
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return result
Definition: formatting.c:1633
static void json_lex_number(JsonLexContext *lex, char *s, bool *num_err, int *total_len)
Definition: json.c:1027
#define PG_GETARG_POINTER(n)
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void EncodeSpecialTimestamp(Timestamp dt, char *str)
Definition: timestamp.c:1523
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#define PG_RETURN_BYTEA_P(x)
Definition: fmgr.h:329
Definition: pgtime.h:25
unsigned int Oid
Definition: postgres_ext.h:31
static bool lex_accept(JsonLexContext *lex, JsonTokenType token, char **lexeme)
Definition: json.c:138
#define OidIsValid(objectId)
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CoercionPathType
Definition: parse_coerce.h:24
#define FirstNormalObjectId
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signed int int32
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struct JsonAggState JsonAggState
#define PG_GETARG_TEXT_PP(n)
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Definition: htup.h:67
#define HeapTupleHeaderGetTypMod(tup)
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Definition: array.h:244
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JsonLexContext * makeJsonLexContext(text *json, bool need_escapes)
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Definition: timestamp.h:122
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JsonParseContext
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Datum json_build_object_noargs(PG_FUNCTION_ARGS)
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Definition: stringinfo.c:78
#define TIMESTAMPOID
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static void parse_array(JsonLexContext *lex, JsonSemAction *sem)
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Oid get_fn_expr_argtype(FmgrInfo *flinfo, int argnum)
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Datum array_to_json(PG_FUNCTION_ARGS)
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Definition: json.c:192
#define ARR_DIMS(a)
Definition: array.h:275
Datum json_build_object(PG_FUNCTION_ARGS)
Definition: json.c:2110
#define DATE_NOT_FINITE(j)
Definition: date.h:42
Datum row_to_json_pretty(PG_FUNCTION_ARGS)
Definition: json.c:1831
Datum json_typeof(PG_FUNCTION_ARGS)
Definition: json.c:2487
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#define INT2OID
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Definition: stringinfo.c:157
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StringInfo str
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#define DatumGetTimestampTz(X)
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static void parse_array_element(JsonLexContext *lex, JsonSemAction *sem)
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#define DatumGetBool(X)
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#define JSONBOID
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void EncodeDateTime(struct pg_tm *tm, fsec_t fsec, bool print_tz, int tz, const char *tzn, int style, char *str)
Definition: datetime.c:3999
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Definition: pg_attribute.h:187
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Definition: stringinfo.c:62
void EncodeSpecialDate(DateADT dt, char *str)
Definition: date.c:299
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int64 Timestamp
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Definition: json.c:123
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Definition: stringinfo.c:169
void initStringInfo(StringInfo str)
Definition: stringinfo.c:46
#define heap_getattr(tup, attnum, tupleDesc, isnull)
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Datum json_object_agg_finalfn(PG_FUNCTION_ARGS)
Definition: json.c:2069
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Definition: builtins.h:92
#define FLOAT4OID
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#define ANYARRAYOID
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uintptr_t Datum
Definition: postgres.h:372
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Definition: jsonapi.h:56
#define PG_RETURN_DATUM(x)
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Definition: mbutils.c:1015
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#define HeapTupleHeaderGetTypeId(tup)
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Datum json_out(PG_FUNCTION_ARGS)
Definition: json.c:245
#define InvalidOid
Definition: postgres_ext.h:36
#define INT8OID
Definition: pg_type.h:304
Datum json_object_agg_transfn(PG_FUNCTION_ARGS)
Definition: json.c:1978
static void add_json(Datum val, bool is_null, StringInfo result, Oid val_type, bool key_scalar)
Definition: json.c:1755
#define PG_RETURN_TEXT_P(x)
Definition: fmgr.h:330
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Definition: varlena.c:149
#define PG_ARGISNULL(n)
Definition: fmgr.h:174
JsonTypeCategory val_category
Definition: json.c:73
#define NULL
Definition: c.h:229
static void json_lex(JsonLexContext *lex)
Definition: json.c:613
#define Assert(condition)
Definition: c.h:676
char * input
Definition: jsonapi.h:53
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Definition: jsonapi.h:87
Definition: regguts.h:298
static void report_invalid_token(JsonLexContext *lex)
Definition: json.c:1232
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Definition: json.c:406
WalTimeSample buffer[LAG_TRACKER_BUFFER_SIZE]
Definition: walsender.c:214
#define PG_RETURN_CSTRING(x)
Definition: fmgr.h:322
static void json_lex_string(JsonLexContext *lex)
Definition: json.c:754
#define FLOAT8OID
Definition: pg_type.h:419
JsonLexContext * makeJsonLexContextCstringLen(char *json, int len, bool need_escapes)
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Definition: nodeAgg.c:4031
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Definition: json.c:271
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Definition: fmgr.h:168
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Definition: mbutils.c:771
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Definition: pg_type.h:288
#define ARR_NDIM(a)
Definition: array.h:271
static void array_to_json_internal(Datum array, StringInfo result, bool use_line_feeds)
Definition: json.c:1635
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Definition: json.c:1877
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Definition: varlena.c:182
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Definition: wchar.c:541
Datum json_build_array_noargs(PG_FUNCTION_ARGS)
Definition: json.c:2247
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Definition: miscadmin.h:214
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Definition: pgtime.h:32
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Definition: fmgr.c:1747
#define VARSIZE_ANY_EXHDR(PTR)
Definition: postgres.h:340
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Definition: mcxt.c:849
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Definition: elog.c:797
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Definition: json.c:109
Datum json_build_array(PG_FUNCTION_ARGS)
Definition: json.c:2197
CoercionPathType find_coercion_pathway(Oid targetTypeId, Oid sourceTypeId, CoercionContext ccontext, Oid *funcid)
int i
#define NameStr(name)
Definition: c.h:499
#define errcontext
Definition: elog.h:164
#define CStringGetTextDatum(s)
Definition: builtins.h:91
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#define PG_GETARG_CSTRING(n)
Definition: fmgr.h:242
Definition: c.h:439
#define PG_FUNCTION_ARGS
Definition: fmgr.h:158
#define POSTGRES_EPOCH_JDATE
Definition: timestamp.h:163
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Definition: jsonapi.h:89
#define SET_VARSIZE(PTR, len)
Definition: postgres.h:328
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Definition: json.c:442
#define elog
Definition: elog.h:219
Datum row_to_json(PG_FUNCTION_ARGS)
Definition: json.c:1815
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Definition: tupdesc.h:109
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Definition: lsyscache.c:2271
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Definition: jsonapi.h:67
#define ARR_ELEMTYPE(a)
Definition: array.h:273
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Definition: jsonapi.h:84
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Definition: stringinfo.c:208
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Definition: informix.c:689
static void parse_object(JsonLexContext *lex, JsonSemAction *sem)
Definition: json.c:488
#define PG_RETURN_NULL()
Definition: fmgr.h:305
json_aelem_action array_element_end
Definition: jsonapi.h:92
Datum json_send(PG_FUNCTION_ARGS)
Definition: json.c:257
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Definition: json.c:1261
JsonTokenType
Definition: jsonapi.h:20
#define DatumGetTimestamp(X)
Definition: timestamp.h:27
#define HeapTupleHeaderGetDatumLength(tup)
Definition: htup_details.h:439
#define DatumGetArrayTypeP(X)
Definition: array.h:242