Line data Source code
1 : %top{
2 : /*-------------------------------------------------------------------------
3 : *
4 : * scan.l
5 : * lexical scanner for PostgreSQL
6 : *
7 : * NOTE NOTE NOTE:
8 : *
9 : * The rules in this file must be kept in sync with src/fe_utils/psqlscan.l
10 : * and src/interfaces/ecpg/preproc/pgc.l!
11 : *
12 : * The rules are designed so that the scanner never has to backtrack,
13 : * in the sense that there is always a rule that can match the input
14 : * consumed so far (the rule action may internally throw back some input
15 : * with yyless(), however). As explained in the flex manual, this makes
16 : * for a useful speed increase --- several percent faster when measuring
17 : * raw parsing (Flex + Bison). The extra complexity is mostly in the rules
18 : * for handling float numbers and continued string literals. If you change
19 : * the lexical rules, verify that you haven't broken the no-backtrack
20 : * property by running flex with the "-b" option and checking that the
21 : * resulting "lex.backup" file says that no backing up is needed. (As of
22 : * Postgres 9.2, this check is made automatically by the Makefile.)
23 : *
24 : *
25 : * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
26 : * Portions Copyright (c) 1994, Regents of the University of California
27 : *
28 : * IDENTIFICATION
29 : * src/backend/parser/scan.l
30 : *
31 : *-------------------------------------------------------------------------
32 : */
33 : #include "postgres.h"
34 :
35 : #include <ctype.h>
36 : #include <unistd.h>
37 :
38 : #include "common/string.h"
39 : #include "gramparse.h"
40 : #include "nodes/miscnodes.h"
41 : #include "parser/parser.h" /* only needed for GUC variables */
42 : #include "parser/scansup.h"
43 : #include "port/pg_bitutils.h"
44 : #include "mb/pg_wchar.h"
45 : #include "utils/builtins.h"
46 : }
47 :
48 : %{
49 :
50 : /* LCOV_EXCL_START */
51 :
52 : /* Avoid exit() on fatal scanner errors (a bit ugly -- see yy_fatal_error) */
53 : #undef fprintf
54 : #define fprintf(file, fmt, msg) fprintf_to_ereport(fmt, msg)
55 :
56 : static void
57 : fprintf_to_ereport(const char *fmt, const char *msg)
58 : {
59 : ereport(ERROR, (errmsg_internal("%s", msg)));
60 : }
61 :
62 : /*
63 : * GUC variables. This is a DIRECT violation of the warning given at the
64 : * head of gram.y, ie flex/bison code must not depend on any GUC variables;
65 : * as such, changing their values can induce very unintuitive behavior.
66 : * But we shall have to live with it until we can remove these variables.
67 : */
68 : int backslash_quote = BACKSLASH_QUOTE_SAFE_ENCODING;
69 : bool escape_string_warning = true;
70 : bool standard_conforming_strings = true;
71 :
72 : /*
73 : * Constant data exported from this file. This array maps from the
74 : * zero-based keyword numbers returned by ScanKeywordLookup to the
75 : * Bison token numbers needed by gram.y. This is exported because
76 : * callers need to pass it to scanner_init, if they are using the
77 : * standard keyword list ScanKeywords.
78 : */
79 : #define PG_KEYWORD(kwname, value, category, collabel) value,
80 :
81 : const uint16 ScanKeywordTokens[] = {
82 : #include "parser/kwlist.h"
83 : };
84 :
85 : #undef PG_KEYWORD
86 :
87 : /*
88 : * Set the type of YYSTYPE.
89 : */
90 : #define YYSTYPE core_YYSTYPE
91 :
92 : /*
93 : * Each call to yylex must set yylloc to the location of the found token
94 : * (expressed as a byte offset from the start of the input text).
95 : * When we parse a token that requires multiple lexer rules to process,
96 : * this should be done in the first such rule, else yylloc will point
97 : * into the middle of the token.
98 : */
99 : #define SET_YYLLOC() (*(yylloc) = yytext - yyextra->scanbuf)
100 :
101 : /*
102 : * Advance yylloc by the given number of bytes.
103 : */
104 : #define ADVANCE_YYLLOC(delta) ( *(yylloc) += (delta) )
105 :
106 : /*
107 : * Sometimes, we do want yylloc to point into the middle of a token; this is
108 : * useful for instance to throw an error about an escape sequence within a
109 : * string literal. But if we find no error there, we want to revert yylloc
110 : * to the token start, so that that's the location reported to the parser.
111 : * Use PUSH_YYLLOC/POP_YYLLOC to save/restore yylloc around such code.
112 : * (Currently the implied "stack" is just one location, but someday we might
113 : * need to nest these.)
114 : */
115 : #define PUSH_YYLLOC() (yyextra->save_yylloc = *(yylloc))
116 : #define POP_YYLLOC() (*(yylloc) = yyextra->save_yylloc)
117 :
118 : #define startlit() ( yyextra->literallen = 0 )
119 : static void addlit(char *ytext, int yleng, core_yyscan_t yyscanner);
120 : static void addlitchar(unsigned char ychar, core_yyscan_t yyscanner);
121 : static char *litbufdup(core_yyscan_t yyscanner);
122 : static unsigned char unescape_single_char(unsigned char c, core_yyscan_t yyscanner);
123 : static int process_integer_literal(const char *token, YYSTYPE *lval, int base);
124 : static void addunicode(pg_wchar c, yyscan_t yyscanner);
125 :
126 : #define yyerror(msg) scanner_yyerror(msg, yyscanner)
127 :
128 : #define lexer_errposition() scanner_errposition(*(yylloc), yyscanner)
129 :
130 : static void check_string_escape_warning(unsigned char ychar, core_yyscan_t yyscanner);
131 : static void check_escape_warning(core_yyscan_t yyscanner);
132 :
133 : %}
134 :
135 : %option reentrant
136 : %option bison-bridge
137 : %option bison-locations
138 : %option 8bit
139 : %option never-interactive
140 : %option nodefault
141 : %option noinput
142 : %option nounput
143 : %option noyywrap
144 : %option noyyalloc
145 : %option noyyrealloc
146 : %option noyyfree
147 : %option warn
148 : %option prefix="core_yy"
149 : %option extra-type="core_yy_extra_type *"
150 :
151 : /*
152 : * OK, here is a short description of lex/flex rules behavior.
153 : * The longest pattern which matches an input string is always chosen.
154 : * For equal-length patterns, the first occurring in the rules list is chosen.
155 : * INITIAL is the starting state, to which all non-conditional rules apply.
156 : * Exclusive states change parsing rules while the state is active. When in
157 : * an exclusive state, only those rules defined for that state apply.
158 : *
159 : * We use exclusive states for quoted strings, extended comments,
160 : * and to eliminate parsing troubles for numeric strings.
161 : * Exclusive states:
162 : * <xb> bit string literal
163 : * <xc> extended C-style comments
164 : * <xd> delimited identifiers (double-quoted identifiers)
165 : * <xh> hexadecimal byte string
166 : * <xq> standard quoted strings
167 : * <xqs> quote stop (detect continued strings)
168 : * <xe> extended quoted strings (support backslash escape sequences)
169 : * <xdolq> $foo$ quoted strings
170 : * <xui> quoted identifier with Unicode escapes
171 : * <xus> quoted string with Unicode escapes
172 : * <xeu> Unicode surrogate pair in extended quoted string
173 : *
174 : * Remember to add an <<EOF>> case whenever you add a new exclusive state!
175 : * The default one is probably not the right thing.
176 : */
177 :
178 : %x xb
179 : %x xc
180 : %x xd
181 : %x xh
182 : %x xq
183 : %x xqs
184 : %x xe
185 : %x xdolq
186 : %x xui
187 : %x xus
188 : %x xeu
189 :
190 : /*
191 : * In order to make the world safe for Windows and Mac clients as well as
192 : * Unix ones, we accept either \n or \r as a newline. A DOS-style \r\n
193 : * sequence will be seen as two successive newlines, but that doesn't cause
194 : * any problems. Comments that start with -- and extend to the next
195 : * newline are treated as equivalent to a single whitespace character.
196 : *
197 : * NOTE a fine point: if there is no newline following --, we will absorb
198 : * everything to the end of the input as a comment. This is correct. Older
199 : * versions of Postgres failed to recognize -- as a comment if the input
200 : * did not end with a newline.
201 : *
202 : * non_newline_space tracks all the other space characters except newlines.
203 : *
204 : * XXX if you change the set of whitespace characters, fix scanner_isspace()
205 : * to agree.
206 : */
207 :
208 : space [ \t\n\r\f\v]
209 : non_newline_space [ \t\f\v]
210 : newline [\n\r]
211 : non_newline [^\n\r]
212 :
213 : comment ("--"{non_newline}*)
214 :
215 : whitespace ({space}+|{comment})
216 :
217 : /*
218 : * SQL requires at least one newline in the whitespace separating
219 : * string literals that are to be concatenated. Silly, but who are we
220 : * to argue? Note that {whitespace_with_newline} should not have * after
221 : * it, whereas {whitespace} should generally have a * after it...
222 : */
223 :
224 : special_whitespace ({space}+|{comment}{newline})
225 : non_newline_whitespace ({non_newline_space}|{comment})
226 : whitespace_with_newline ({non_newline_whitespace}*{newline}{special_whitespace}*)
227 :
228 : quote '
229 : /* If we see {quote} then {quotecontinue}, the quoted string continues */
230 : quotecontinue {whitespace_with_newline}{quote}
231 :
232 : /*
233 : * {quotecontinuefail} is needed to avoid lexer backup when we fail to match
234 : * {quotecontinue}. It might seem that this could just be {whitespace}*,
235 : * but if there's a dash after {whitespace_with_newline}, it must be consumed
236 : * to see if there's another dash --- which would start a {comment} and thus
237 : * allow continuation of the {quotecontinue} token.
238 : */
239 : quotecontinuefail {whitespace}*"-"?
240 :
241 : /* Bit string
242 : * It is tempting to scan the string for only those characters
243 : * which are allowed. However, this leads to silently swallowed
244 : * characters if illegal characters are included in the string.
245 : * For example, if xbinside is [01] then B'ABCD' is interpreted
246 : * as a zero-length string, and the ABCD' is lost!
247 : * Better to pass the string forward and let the input routines
248 : * validate the contents.
249 : */
250 : xbstart [bB]{quote}
251 : xbinside [^']*
252 :
253 : /* Hexadecimal byte string */
254 : xhstart [xX]{quote}
255 : xhinside [^']*
256 :
257 : /* National character */
258 : xnstart [nN]{quote}
259 :
260 : /* Quoted string that allows backslash escapes */
261 : xestart [eE]{quote}
262 : xeinside [^\\']+
263 : xeescape [\\][^0-7]
264 : xeoctesc [\\][0-7]{1,3}
265 : xehexesc [\\]x[0-9A-Fa-f]{1,2}
266 : xeunicode [\\](u[0-9A-Fa-f]{4}|U[0-9A-Fa-f]{8})
267 : xeunicodefail [\\](u[0-9A-Fa-f]{0,3}|U[0-9A-Fa-f]{0,7})
268 :
269 : /* Extended quote
270 : * xqdouble implements embedded quote, ''''
271 : */
272 : xqstart {quote}
273 : xqdouble {quote}{quote}
274 : xqinside [^']+
275 :
276 : /* $foo$ style quotes ("dollar quoting")
277 : * The quoted string starts with $foo$ where "foo" is an optional string
278 : * in the form of an identifier, except that it may not contain "$",
279 : * and extends to the first occurrence of an identical string.
280 : * There is *no* processing of the quoted text.
281 : *
282 : * {dolqfailed} is an error rule to avoid scanner backup when {dolqdelim}
283 : * fails to match its trailing "$".
284 : */
285 : dolq_start [A-Za-z\200-\377_]
286 : dolq_cont [A-Za-z\200-\377_0-9]
287 : dolqdelim \$({dolq_start}{dolq_cont}*)?\$
288 : dolqfailed \${dolq_start}{dolq_cont}*
289 : dolqinside [^$]+
290 :
291 : /* Double quote
292 : * Allows embedded spaces and other special characters into identifiers.
293 : */
294 : dquote \"
295 : xdstart {dquote}
296 : xdstop {dquote}
297 : xddouble {dquote}{dquote}
298 : xdinside [^"]+
299 :
300 : /* Quoted identifier with Unicode escapes */
301 : xuistart [uU]&{dquote}
302 :
303 : /* Quoted string with Unicode escapes */
304 : xusstart [uU]&{quote}
305 :
306 : /* error rule to avoid backup */
307 : xufailed [uU]&
308 :
309 :
310 : /* C-style comments
311 : *
312 : * The "extended comment" syntax closely resembles allowable operator syntax.
313 : * The tricky part here is to get lex to recognize a string starting with
314 : * slash-star as a comment, when interpreting it as an operator would produce
315 : * a longer match --- remember lex will prefer a longer match! Also, if we
316 : * have something like plus-slash-star, lex will think this is a 3-character
317 : * operator whereas we want to see it as a + operator and a comment start.
318 : * The solution is two-fold:
319 : * 1. append {op_chars}* to xcstart so that it matches as much text as
320 : * {operator} would. Then the tie-breaker (first matching rule of same
321 : * length) ensures xcstart wins. We put back the extra stuff with yyless()
322 : * in case it contains a star-slash that should terminate the comment.
323 : * 2. In the operator rule, check for slash-star within the operator, and
324 : * if found throw it back with yyless(). This handles the plus-slash-star
325 : * problem.
326 : * Dash-dash comments have similar interactions with the operator rule.
327 : */
328 : xcstart \/\*{op_chars}*
329 : xcstop \*+\/
330 : xcinside [^*/]+
331 :
332 : ident_start [A-Za-z\200-\377_]
333 : ident_cont [A-Za-z\200-\377_0-9\$]
334 :
335 : identifier {ident_start}{ident_cont}*
336 :
337 : /* Assorted special-case operators and operator-like tokens */
338 : typecast "::"
339 : dot_dot \.\.
340 : colon_equals ":="
341 :
342 : /*
343 : * These operator-like tokens (unlike the above ones) also match the {operator}
344 : * rule, which means that they might be overridden by a longer match if they
345 : * are followed by a comment start or a + or - character. Accordingly, if you
346 : * add to this list, you must also add corresponding code to the {operator}
347 : * block to return the correct token in such cases. (This is not needed in
348 : * psqlscan.l since the token value is ignored there.)
349 : */
350 : equals_greater "=>"
351 : less_equals "<="
352 : greater_equals ">="
353 : less_greater "<>"
354 : not_equals "!="
355 :
356 : /*
357 : * "self" is the set of chars that should be returned as single-character
358 : * tokens. "op_chars" is the set of chars that can make up "Op" tokens,
359 : * which can be one or more characters long (but if a single-char token
360 : * appears in the "self" set, it is not to be returned as an Op). Note
361 : * that the sets overlap, but each has some chars that are not in the other.
362 : *
363 : * If you change either set, adjust the character lists appearing in the
364 : * rule for "operator"!
365 : */
366 : self [,()\[\].;\:\+\-\*\/\%\^\<\>\=]
367 : op_chars [\~\!\@\#\^\&\|\`\?\+\-\*\/\%\<\>\=]
368 : operator {op_chars}+
369 :
370 : /*
371 : * Numbers
372 : *
373 : * Unary minus is not part of a number here. Instead we pass it separately to
374 : * the parser, and there it gets coerced via doNegate().
375 : *
376 : * {numericfail} is used because we would like "1..10" to lex as 1, dot_dot, 10.
377 : *
378 : * {realfail} is added to prevent the need for scanner
379 : * backup when the {real} rule fails to match completely.
380 : */
381 : decdigit [0-9]
382 : hexdigit [0-9A-Fa-f]
383 : octdigit [0-7]
384 : bindigit [0-1]
385 :
386 : decinteger {decdigit}(_?{decdigit})*
387 : hexinteger 0[xX](_?{hexdigit})+
388 : octinteger 0[oO](_?{octdigit})+
389 : bininteger 0[bB](_?{bindigit})+
390 :
391 : hexfail 0[xX]_?
392 : octfail 0[oO]_?
393 : binfail 0[bB]_?
394 :
395 : numeric (({decinteger}\.{decinteger}?)|(\.{decinteger}))
396 : numericfail {decinteger}\.\.
397 :
398 : real ({decinteger}|{numeric})[Ee][-+]?{decinteger}
399 : realfail ({decinteger}|{numeric})[Ee][-+]
400 :
401 : /* Positional parameters don't accept underscores. */
402 : param \${decdigit}+
403 :
404 : /*
405 : * An identifier immediately following an integer literal is disallowed because
406 : * in some cases it's ambiguous what is meant: for example, 0x1234 could be
407 : * either a hexinteger or a decinteger "0" and an identifier "x1234". We can
408 : * detect such problems by seeing if integer_junk matches a longer substring
409 : * than any of the XXXinteger patterns (decinteger, hexinteger, octinteger,
410 : * bininteger). One "junk" pattern is sufficient because
411 : * {decinteger}{identifier} will match all the same strings we'd match with
412 : * {hexinteger}{identifier} etc.
413 : *
414 : * Note that the rule for integer_junk must appear after the ones for
415 : * XXXinteger to make this work correctly: 0x1234 will match both hexinteger
416 : * and integer_junk, and we need hexinteger to be chosen in that case.
417 : *
418 : * Also disallow strings matched by numeric_junk, real_junk and param_junk
419 : * for consistency.
420 : */
421 : integer_junk {decinteger}{identifier}
422 : numeric_junk {numeric}{identifier}
423 : real_junk {real}{identifier}
424 : param_junk \${decdigit}+{identifier}
425 :
426 : other .
427 :
428 : /*
429 : * Dollar quoted strings are totally opaque, and no escaping is done on them.
430 : * Other quoted strings must allow some special characters such as single-quote
431 : * and newline.
432 : * Embedded single-quotes are implemented both in the SQL standard
433 : * style of two adjacent single quotes "''" and in the Postgres/Java style
434 : * of escaped-quote "\'".
435 : * Other embedded escaped characters are matched explicitly and the leading
436 : * backslash is dropped from the string.
437 : * Note that xcstart must appear before operator, as explained above!
438 : * Also whitespace (comment) must appear before operator.
439 : */
440 :
441 : %%
442 :
443 : {whitespace} {
444 : /* ignore */
445 : }
446 :
447 : {xcstart} {
448 : /* Set location in case of syntax error in comment */
449 : SET_YYLLOC();
450 : yyextra->xcdepth = 0;
451 : BEGIN(xc);
452 : /* Put back any characters past slash-star; see above */
453 : yyless(2);
454 : }
455 :
456 : <xc>{
457 : {xcstart} {
458 : (yyextra->xcdepth)++;
459 : /* Put back any characters past slash-star; see above */
460 : yyless(2);
461 : }
462 :
463 : {xcstop} {
464 : if (yyextra->xcdepth <= 0)
465 : BEGIN(INITIAL);
466 : else
467 : (yyextra->xcdepth)--;
468 : }
469 :
470 : {xcinside} {
471 : /* ignore */
472 : }
473 :
474 : {op_chars} {
475 : /* ignore */
476 : }
477 :
478 : \*+ {
479 : /* ignore */
480 : }
481 :
482 : <<EOF>> {
483 : yyerror("unterminated /* comment");
484 : }
485 : } /* <xc> */
486 :
487 : {xbstart} {
488 : /* Binary bit type.
489 : * At some point we should simply pass the string
490 : * forward to the parser and label it there.
491 : * In the meantime, place a leading "b" on the string
492 : * to mark it for the input routine as a binary string.
493 : */
494 : SET_YYLLOC();
495 : BEGIN(xb);
496 : startlit();
497 : addlitchar('b', yyscanner);
498 : }
499 : <xh>{xhinside} |
500 : <xb>{xbinside} {
501 : addlit(yytext, yyleng, yyscanner);
502 : }
503 : <xb><<EOF>> { yyerror("unterminated bit string literal"); }
504 :
505 : {xhstart} {
506 : /* Hexadecimal bit type.
507 : * At some point we should simply pass the string
508 : * forward to the parser and label it there.
509 : * In the meantime, place a leading "x" on the string
510 : * to mark it for the input routine as a hex string.
511 : */
512 : SET_YYLLOC();
513 : BEGIN(xh);
514 : startlit();
515 : addlitchar('x', yyscanner);
516 : }
517 : <xh><<EOF>> { yyerror("unterminated hexadecimal string literal"); }
518 :
519 : {xnstart} {
520 : /* National character.
521 : * We will pass this along as a normal character string,
522 : * but preceded with an internally-generated "NCHAR".
523 : */
524 : int kwnum;
525 :
526 : SET_YYLLOC();
527 : yyless(1); /* eat only 'n' this time */
528 :
529 : kwnum = ScanKeywordLookup("nchar",
530 : yyextra->keywordlist);
531 : if (kwnum >= 0)
532 : {
533 : yylval->keyword = GetScanKeyword(kwnum,
534 : yyextra->keywordlist);
535 : return yyextra->keyword_tokens[kwnum];
536 : }
537 : else
538 : {
539 : /* If NCHAR isn't a keyword, just return "n" */
540 : yylval->str = pstrdup("n");
541 : return IDENT;
542 : }
543 : }
544 :
545 : {xqstart} {
546 : yyextra->warn_on_first_escape = true;
547 : yyextra->saw_non_ascii = false;
548 : SET_YYLLOC();
549 : if (yyextra->standard_conforming_strings)
550 : BEGIN(xq);
551 : else
552 : BEGIN(xe);
553 : startlit();
554 : }
555 : {xestart} {
556 : yyextra->warn_on_first_escape = false;
557 : yyextra->saw_non_ascii = false;
558 : SET_YYLLOC();
559 : BEGIN(xe);
560 : startlit();
561 : }
562 : {xusstart} {
563 : SET_YYLLOC();
564 : if (!yyextra->standard_conforming_strings)
565 : ereport(ERROR,
566 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
567 : errmsg("unsafe use of string constant with Unicode escapes"),
568 : errdetail("String constants with Unicode escapes cannot be used when \"standard_conforming_strings\" is off."),
569 : lexer_errposition()));
570 : BEGIN(xus);
571 : startlit();
572 : }
573 :
574 : <xb,xh,xq,xe,xus>{quote} {
575 : /*
576 : * When we are scanning a quoted string and see an end
577 : * quote, we must look ahead for a possible continuation.
578 : * If we don't see one, we know the end quote was in fact
579 : * the end of the string. To reduce the lexer table size,
580 : * we use a single "xqs" state to do the lookahead for all
581 : * types of strings.
582 : */
583 : yyextra->state_before_str_stop = YYSTATE;
584 : BEGIN(xqs);
585 : }
586 : <xqs>{quotecontinue} {
587 : /*
588 : * Found a quote continuation, so return to the in-quote
589 : * state and continue scanning the literal. Nothing is
590 : * added to the literal's contents.
591 : */
592 : BEGIN(yyextra->state_before_str_stop);
593 : }
594 : <xqs>{quotecontinuefail} |
595 : <xqs>{other} |
596 : <xqs><<EOF>> {
597 : /*
598 : * Failed to see a quote continuation. Throw back
599 : * everything after the end quote, and handle the string
600 : * according to the state we were in previously.
601 : */
602 : yyless(0);
603 : BEGIN(INITIAL);
604 :
605 : switch (yyextra->state_before_str_stop)
606 : {
607 : case xb:
608 : yylval->str = litbufdup(yyscanner);
609 : return BCONST;
610 : case xh:
611 : yylval->str = litbufdup(yyscanner);
612 : return XCONST;
613 : case xq:
614 : case xe:
615 : /*
616 : * Check that the data remains valid, if it might
617 : * have been made invalid by unescaping any chars.
618 : */
619 : if (yyextra->saw_non_ascii)
620 : pg_verifymbstr(yyextra->literalbuf,
621 : yyextra->literallen,
622 : false);
623 : yylval->str = litbufdup(yyscanner);
624 : return SCONST;
625 : case xus:
626 : yylval->str = litbufdup(yyscanner);
627 : return USCONST;
628 : default:
629 : yyerror("unhandled previous state in xqs");
630 : }
631 : }
632 :
633 : <xq,xe,xus>{xqdouble} {
634 : addlitchar('\'', yyscanner);
635 : }
636 : <xq,xus>{xqinside} {
637 : addlit(yytext, yyleng, yyscanner);
638 : }
639 : <xe>{xeinside} {
640 : addlit(yytext, yyleng, yyscanner);
641 : }
642 : <xe>{xeunicode} {
643 : pg_wchar c = strtoul(yytext + 2, NULL, 16);
644 :
645 : /*
646 : * For consistency with other productions, issue any
647 : * escape warning with cursor pointing to start of string.
648 : * We might want to change that, someday.
649 : */
650 : check_escape_warning(yyscanner);
651 :
652 : /* Remember start of overall string token ... */
653 : PUSH_YYLLOC();
654 : /* ... and set the error cursor to point at this esc seq */
655 : SET_YYLLOC();
656 :
657 : if (is_utf16_surrogate_first(c))
658 : {
659 : yyextra->utf16_first_part = c;
660 : BEGIN(xeu);
661 : }
662 : else if (is_utf16_surrogate_second(c))
663 : yyerror("invalid Unicode surrogate pair");
664 : else
665 : addunicode(c, yyscanner);
666 :
667 : /* Restore yylloc to be start of string token */
668 : POP_YYLLOC();
669 : }
670 : <xeu>{xeunicode} {
671 : pg_wchar c = strtoul(yytext + 2, NULL, 16);
672 :
673 : /* Remember start of overall string token ... */
674 : PUSH_YYLLOC();
675 : /* ... and set the error cursor to point at this esc seq */
676 : SET_YYLLOC();
677 :
678 : if (!is_utf16_surrogate_second(c))
679 : yyerror("invalid Unicode surrogate pair");
680 :
681 : c = surrogate_pair_to_codepoint(yyextra->utf16_first_part, c);
682 :
683 : addunicode(c, yyscanner);
684 :
685 : /* Restore yylloc to be start of string token */
686 : POP_YYLLOC();
687 :
688 : BEGIN(xe);
689 : }
690 : <xeu>. |
691 : <xeu>\n |
692 : <xeu><<EOF>> {
693 : /* Set the error cursor to point at missing esc seq */
694 : SET_YYLLOC();
695 : yyerror("invalid Unicode surrogate pair");
696 : }
697 : <xe,xeu>{xeunicodefail} {
698 : /* Set the error cursor to point at malformed esc seq */
699 : SET_YYLLOC();
700 : ereport(ERROR,
701 : (errcode(ERRCODE_INVALID_ESCAPE_SEQUENCE),
702 : errmsg("invalid Unicode escape"),
703 : errhint("Unicode escapes must be \\uXXXX or \\UXXXXXXXX."),
704 : lexer_errposition()));
705 : }
706 : <xe>{xeescape} {
707 : if (yytext[1] == '\'')
708 : {
709 : if (yyextra->backslash_quote == BACKSLASH_QUOTE_OFF ||
710 : (yyextra->backslash_quote == BACKSLASH_QUOTE_SAFE_ENCODING &&
711 : PG_ENCODING_IS_CLIENT_ONLY(pg_get_client_encoding())))
712 : ereport(ERROR,
713 : (errcode(ERRCODE_NONSTANDARD_USE_OF_ESCAPE_CHARACTER),
714 : errmsg("unsafe use of \\' in a string literal"),
715 : errhint("Use '' to write quotes in strings. \\' is insecure in client-only encodings."),
716 : lexer_errposition()));
717 : }
718 : check_string_escape_warning(yytext[1], yyscanner);
719 : addlitchar(unescape_single_char(yytext[1], yyscanner),
720 : yyscanner);
721 : }
722 : <xe>{xeoctesc} {
723 : unsigned char c = strtoul(yytext + 1, NULL, 8);
724 :
725 : check_escape_warning(yyscanner);
726 : addlitchar(c, yyscanner);
727 : if (c == '\0' || IS_HIGHBIT_SET(c))
728 : yyextra->saw_non_ascii = true;
729 : }
730 : <xe>{xehexesc} {
731 : unsigned char c = strtoul(yytext + 2, NULL, 16);
732 :
733 : check_escape_warning(yyscanner);
734 : addlitchar(c, yyscanner);
735 : if (c == '\0' || IS_HIGHBIT_SET(c))
736 : yyextra->saw_non_ascii = true;
737 : }
738 : <xe>. {
739 : /* This is only needed for \ just before EOF */
740 : addlitchar(yytext[0], yyscanner);
741 : }
742 : <xq,xe,xus><<EOF>> { yyerror("unterminated quoted string"); }
743 :
744 : {dolqdelim} {
745 : SET_YYLLOC();
746 : yyextra->dolqstart = pstrdup(yytext);
747 : BEGIN(xdolq);
748 : startlit();
749 : }
750 : {dolqfailed} {
751 : SET_YYLLOC();
752 : /* throw back all but the initial "$" */
753 : yyless(1);
754 : /* and treat it as {other} */
755 : return yytext[0];
756 : }
757 : <xdolq>{dolqdelim} {
758 : if (strcmp(yytext, yyextra->dolqstart) == 0)
759 : {
760 : pfree(yyextra->dolqstart);
761 : yyextra->dolqstart = NULL;
762 : BEGIN(INITIAL);
763 : yylval->str = litbufdup(yyscanner);
764 : return SCONST;
765 : }
766 : else
767 : {
768 : /*
769 : * When we fail to match $...$ to dolqstart, transfer
770 : * the $... part to the output, but put back the final
771 : * $ for rescanning. Consider $delim$...$junk$delim$
772 : */
773 : addlit(yytext, yyleng - 1, yyscanner);
774 : yyless(yyleng - 1);
775 : }
776 : }
777 : <xdolq>{dolqinside} {
778 : addlit(yytext, yyleng, yyscanner);
779 : }
780 : <xdolq>{dolqfailed} {
781 : addlit(yytext, yyleng, yyscanner);
782 : }
783 : <xdolq>. {
784 : /* This is only needed for $ inside the quoted text */
785 : addlitchar(yytext[0], yyscanner);
786 : }
787 : <xdolq><<EOF>> { yyerror("unterminated dollar-quoted string"); }
788 :
789 : {xdstart} {
790 : SET_YYLLOC();
791 : BEGIN(xd);
792 : startlit();
793 : }
794 : {xuistart} {
795 : SET_YYLLOC();
796 : BEGIN(xui);
797 : startlit();
798 : }
799 : <xd>{xdstop} {
800 : char *ident;
801 :
802 : BEGIN(INITIAL);
803 : if (yyextra->literallen == 0)
804 : yyerror("zero-length delimited identifier");
805 : ident = litbufdup(yyscanner);
806 : if (yyextra->literallen >= NAMEDATALEN)
807 : truncate_identifier(ident, yyextra->literallen, true);
808 : yylval->str = ident;
809 : return IDENT;
810 : }
811 : <xui>{dquote} {
812 : BEGIN(INITIAL);
813 : if (yyextra->literallen == 0)
814 : yyerror("zero-length delimited identifier");
815 : /* can't truncate till after we de-escape the ident */
816 : yylval->str = litbufdup(yyscanner);
817 : return UIDENT;
818 : }
819 : <xd,xui>{xddouble} {
820 : addlitchar('"', yyscanner);
821 : }
822 : <xd,xui>{xdinside} {
823 : addlit(yytext, yyleng, yyscanner);
824 : }
825 : <xd,xui><<EOF>> { yyerror("unterminated quoted identifier"); }
826 :
827 : {xufailed} {
828 : char *ident;
829 :
830 : SET_YYLLOC();
831 : /* throw back all but the initial u/U */
832 : yyless(1);
833 : /* and treat it as {identifier} */
834 : ident = downcase_truncate_identifier(yytext, yyleng, true);
835 : yylval->str = ident;
836 : return IDENT;
837 : }
838 :
839 : {typecast} {
840 : SET_YYLLOC();
841 : return TYPECAST;
842 : }
843 :
844 : {dot_dot} {
845 : SET_YYLLOC();
846 : return DOT_DOT;
847 : }
848 :
849 : {colon_equals} {
850 : SET_YYLLOC();
851 : return COLON_EQUALS;
852 : }
853 :
854 : {equals_greater} {
855 : SET_YYLLOC();
856 : return EQUALS_GREATER;
857 : }
858 :
859 : {less_equals} {
860 : SET_YYLLOC();
861 : return LESS_EQUALS;
862 : }
863 :
864 : {greater_equals} {
865 : SET_YYLLOC();
866 : return GREATER_EQUALS;
867 : }
868 :
869 : {less_greater} {
870 : /* We accept both "<>" and "!=" as meaning NOT_EQUALS */
871 : SET_YYLLOC();
872 : return NOT_EQUALS;
873 : }
874 :
875 : {not_equals} {
876 : /* We accept both "<>" and "!=" as meaning NOT_EQUALS */
877 : SET_YYLLOC();
878 : return NOT_EQUALS;
879 : }
880 :
881 : {self} {
882 : SET_YYLLOC();
883 : return yytext[0];
884 : }
885 :
886 : {operator} {
887 : /*
888 : * Check for embedded slash-star or dash-dash; those
889 : * are comment starts, so operator must stop there.
890 : * Note that slash-star or dash-dash at the first
891 : * character will match a prior rule, not this one.
892 : */
893 : int nchars = yyleng;
894 : char *slashstar = strstr(yytext, "/*");
895 : char *dashdash = strstr(yytext, "--");
896 :
897 : if (slashstar && dashdash)
898 : {
899 : /* if both appear, take the first one */
900 : if (slashstar > dashdash)
901 : slashstar = dashdash;
902 : }
903 : else if (!slashstar)
904 : slashstar = dashdash;
905 : if (slashstar)
906 : nchars = slashstar - yytext;
907 :
908 : /*
909 : * For SQL compatibility, '+' and '-' cannot be the
910 : * last char of a multi-char operator unless the operator
911 : * contains chars that are not in SQL operators.
912 : * The idea is to lex '=-' as two operators, but not
913 : * to forbid operator names like '?-' that could not be
914 : * sequences of SQL operators.
915 : */
916 : if (nchars > 1 &&
917 : (yytext[nchars - 1] == '+' ||
918 : yytext[nchars - 1] == '-'))
919 : {
920 : int ic;
921 :
922 : for (ic = nchars - 2; ic >= 0; ic--)
923 : {
924 : char c = yytext[ic];
925 : if (c == '~' || c == '!' || c == '@' ||
926 : c == '#' || c == '^' || c == '&' ||
927 : c == '|' || c == '`' || c == '?' ||
928 : c == '%')
929 : break;
930 : }
931 : if (ic < 0)
932 : {
933 : /*
934 : * didn't find a qualifying character, so remove
935 : * all trailing [+-]
936 : */
937 : do {
938 : nchars--;
939 : } while (nchars > 1 &&
940 : (yytext[nchars - 1] == '+' ||
941 : yytext[nchars - 1] == '-'));
942 : }
943 : }
944 :
945 : SET_YYLLOC();
946 :
947 : if (nchars < yyleng)
948 : {
949 : /* Strip the unwanted chars from the token */
950 : yyless(nchars);
951 : /*
952 : * If what we have left is only one char, and it's
953 : * one of the characters matching "self", then
954 : * return it as a character token the same way
955 : * that the "self" rule would have.
956 : */
957 : if (nchars == 1 &&
958 : strchr(",()[].;:+-*/%^<>=", yytext[0]))
959 : return yytext[0];
960 : /*
961 : * Likewise, if what we have left is two chars, and
962 : * those match the tokens ">=", "<=", "=>", "<>" or
963 : * "!=", then we must return the appropriate token
964 : * rather than the generic Op.
965 : */
966 : if (nchars == 2)
967 : {
968 : if (yytext[0] == '=' && yytext[1] == '>')
969 : return EQUALS_GREATER;
970 : if (yytext[0] == '>' && yytext[1] == '=')
971 : return GREATER_EQUALS;
972 : if (yytext[0] == '<' && yytext[1] == '=')
973 : return LESS_EQUALS;
974 : if (yytext[0] == '<' && yytext[1] == '>')
975 : return NOT_EQUALS;
976 : if (yytext[0] == '!' && yytext[1] == '=')
977 : return NOT_EQUALS;
978 : }
979 : }
980 :
981 : /*
982 : * Complain if operator is too long. Unlike the case
983 : * for identifiers, we make this an error not a notice-
984 : * and-truncate, because the odds are we are looking at
985 : * a syntactic mistake anyway.
986 : */
987 : if (nchars >= NAMEDATALEN)
988 : yyerror("operator too long");
989 :
990 : yylval->str = pstrdup(yytext);
991 : return Op;
992 : }
993 :
994 : {param} {
995 : ErrorSaveContext escontext = {T_ErrorSaveContext};
996 : int32 val;
997 :
998 : SET_YYLLOC();
999 : val = pg_strtoint32_safe(yytext + 1, (Node *) &escontext);
1000 : if (escontext.error_occurred)
1001 : yyerror("parameter number too large");
1002 : yylval->ival = val;
1003 : return PARAM;
1004 : }
1005 : {param_junk} {
1006 : SET_YYLLOC();
1007 : yyerror("trailing junk after parameter");
1008 : }
1009 :
1010 : {decinteger} {
1011 : SET_YYLLOC();
1012 : return process_integer_literal(yytext, yylval, 10);
1013 : }
1014 : {hexinteger} {
1015 : SET_YYLLOC();
1016 : return process_integer_literal(yytext, yylval, 16);
1017 : }
1018 : {octinteger} {
1019 : SET_YYLLOC();
1020 : return process_integer_literal(yytext, yylval, 8);
1021 : }
1022 : {bininteger} {
1023 : SET_YYLLOC();
1024 : return process_integer_literal(yytext, yylval, 2);
1025 : }
1026 : {hexfail} {
1027 : SET_YYLLOC();
1028 : yyerror("invalid hexadecimal integer");
1029 : }
1030 : {octfail} {
1031 : SET_YYLLOC();
1032 : yyerror("invalid octal integer");
1033 : }
1034 : {binfail} {
1035 : SET_YYLLOC();
1036 : yyerror("invalid binary integer");
1037 : }
1038 : {numeric} {
1039 : SET_YYLLOC();
1040 : yylval->str = pstrdup(yytext);
1041 : return FCONST;
1042 : }
1043 : {numericfail} {
1044 : /* throw back the .., and treat as integer */
1045 : yyless(yyleng - 2);
1046 : SET_YYLLOC();
1047 : return process_integer_literal(yytext, yylval, 10);
1048 : }
1049 : {real} {
1050 : SET_YYLLOC();
1051 : yylval->str = pstrdup(yytext);
1052 : return FCONST;
1053 : }
1054 : {realfail} {
1055 : SET_YYLLOC();
1056 : yyerror("trailing junk after numeric literal");
1057 : }
1058 : {integer_junk} {
1059 : SET_YYLLOC();
1060 : yyerror("trailing junk after numeric literal");
1061 : }
1062 : {numeric_junk} {
1063 : SET_YYLLOC();
1064 : yyerror("trailing junk after numeric literal");
1065 : }
1066 : {real_junk} {
1067 : SET_YYLLOC();
1068 : yyerror("trailing junk after numeric literal");
1069 : }
1070 :
1071 :
1072 : {identifier} {
1073 : int kwnum;
1074 : char *ident;
1075 :
1076 : SET_YYLLOC();
1077 :
1078 : /* Is it a keyword? */
1079 : kwnum = ScanKeywordLookup(yytext,
1080 : yyextra->keywordlist);
1081 : if (kwnum >= 0)
1082 : {
1083 : yylval->keyword = GetScanKeyword(kwnum,
1084 : yyextra->keywordlist);
1085 : return yyextra->keyword_tokens[kwnum];
1086 : }
1087 :
1088 : /*
1089 : * No. Convert the identifier to lower case, and truncate
1090 : * if necessary.
1091 : */
1092 : ident = downcase_truncate_identifier(yytext, yyleng, true);
1093 : yylval->str = ident;
1094 : return IDENT;
1095 : }
1096 :
1097 : {other} {
1098 : SET_YYLLOC();
1099 : return yytext[0];
1100 : }
1101 :
1102 : <<EOF>> {
1103 : SET_YYLLOC();
1104 : yyterminate();
1105 : }
1106 :
1107 : %%
1108 :
1109 : /* LCOV_EXCL_STOP */
1110 :
1111 : /*
1112 : * Arrange access to yyextra for subroutines of the main yylex() function.
1113 : * We expect each subroutine to have a yyscanner parameter. Rather than
1114 : * use the yyget_xxx functions, which might or might not get inlined by the
1115 : * compiler, we cheat just a bit and cast yyscanner to the right type.
1116 : */
1117 : #undef yyextra
1118 : #define yyextra (((struct yyguts_t *) yyscanner)->yyextra_r)
1119 :
1120 : /* Likewise for a couple of other things we need. */
1121 : #undef yylloc
1122 : #define yylloc (((struct yyguts_t *) yyscanner)->yylloc_r)
1123 : #undef yyleng
1124 : #define yyleng (((struct yyguts_t *) yyscanner)->yyleng_r)
1125 :
1126 :
1127 : /*
1128 : * scanner_errposition
1129 : * Report a lexer or grammar error cursor position, if possible.
1130 : *
1131 : * This is expected to be used within an ereport() call, or via an error
1132 : * callback such as setup_scanner_errposition_callback(). The return value
1133 : * is a dummy (always 0, in fact).
1134 : *
1135 : * Note that this can only be used for messages emitted during raw parsing
1136 : * (essentially, scan.l, parser.c, and gram.y), since it requires the
1137 : * yyscanner struct to still be available.
1138 : */
1139 : int
1140 1288 : scanner_errposition(int location, core_yyscan_t yyscanner)
1141 : {
1142 : int pos;
1143 :
1144 1288 : if (location < 0)
1145 0 : return 0; /* no-op if location is unknown */
1146 :
1147 : /* Convert byte offset to character number */
1148 1288 : pos = pg_mbstrlen_with_len(yyextra->scanbuf, location) + 1;
1149 : /* And pass it to the ereport mechanism */
1150 1288 : return errposition(pos);
1151 : }
1152 :
1153 : /*
1154 : * Error context callback for inserting scanner error location.
1155 : *
1156 : * Note that this will be called for *any* error occurring while the
1157 : * callback is installed. We avoid inserting an irrelevant error location
1158 : * if the error is a query cancel --- are there any other important cases?
1159 : */
1160 : static void
1161 36 : scb_error_callback(void *arg)
1162 : {
1163 36 : ScannerCallbackState *scbstate = (ScannerCallbackState *) arg;
1164 :
1165 36 : if (geterrcode() != ERRCODE_QUERY_CANCELED)
1166 36 : (void) scanner_errposition(scbstate->location, scbstate->yyscanner);
1167 36 : }
1168 :
1169 : /*
1170 : * setup_scanner_errposition_callback
1171 : * Arrange for non-scanner errors to report an error position
1172 : *
1173 : * Sometimes the scanner calls functions that aren't part of the scanner
1174 : * subsystem and can't reasonably be passed the yyscanner pointer; yet
1175 : * we would like any errors thrown in those functions to be tagged with an
1176 : * error location. Use this function to set up an error context stack
1177 : * entry that will accomplish that. Usage pattern:
1178 : *
1179 : * declare a local variable "ScannerCallbackState scbstate"
1180 : * ...
1181 : * setup_scanner_errposition_callback(&scbstate, yyscanner, location);
1182 : * call function that might throw error;
1183 : * cancel_scanner_errposition_callback(&scbstate);
1184 : */
1185 : void
1186 862 : setup_scanner_errposition_callback(ScannerCallbackState *scbstate,
1187 : core_yyscan_t yyscanner,
1188 : int location)
1189 : {
1190 : /* Setup error traceback support for ereport() */
1191 862 : scbstate->yyscanner = yyscanner;
1192 862 : scbstate->location = location;
1193 862 : scbstate->errcallback.callback = scb_error_callback;
1194 862 : scbstate->errcallback.arg = scbstate;
1195 862 : scbstate->errcallback.previous = error_context_stack;
1196 862 : error_context_stack = &scbstate->errcallback;
1197 862 : }
1198 :
1199 : /*
1200 : * Cancel a previously-set-up errposition callback.
1201 : */
1202 : void
1203 826 : cancel_scanner_errposition_callback(ScannerCallbackState *scbstate)
1204 : {
1205 : /* Pop the error context stack */
1206 826 : error_context_stack = scbstate->errcallback.previous;
1207 826 : }
1208 :
1209 : /*
1210 : * scanner_yyerror
1211 : * Report a lexer or grammar error.
1212 : *
1213 : * The message's cursor position is whatever YYLLOC was last set to,
1214 : * ie, the start of the current token if called within yylex(), or the
1215 : * most recently lexed token if called from the grammar.
1216 : * This is OK for syntax error messages from the Bison parser, because Bison
1217 : * parsers report error as soon as the first unparsable token is reached.
1218 : * Beware of using yyerror for other purposes, as the cursor position might
1219 : * be misleading!
1220 : */
1221 : void
1222 918 : scanner_yyerror(const char *message, core_yyscan_t yyscanner)
1223 : {
1224 918 : const char *loc = yyextra->scanbuf + *yylloc;
1225 :
1226 918 : if (*loc == YY_END_OF_BUFFER_CHAR)
1227 : {
1228 18 : ereport(ERROR,
1229 : (errcode(ERRCODE_SYNTAX_ERROR),
1230 : /* translator: %s is typically the translation of "syntax error" */
1231 : errmsg("%s at end of input", _(message)),
1232 : lexer_errposition()));
1233 : }
1234 : else
1235 : {
1236 900 : ereport(ERROR,
1237 : (errcode(ERRCODE_SYNTAX_ERROR),
1238 : /* translator: first %s is typically the translation of "syntax error" */
1239 : errmsg("%s at or near \"%s\"", _(message), loc),
1240 : lexer_errposition()));
1241 : }
1242 : }
1243 :
1244 :
1245 : /*
1246 : * Called before any actual parsing is done
1247 : */
1248 : core_yyscan_t
1249 788124 : scanner_init(const char *str,
1250 : core_yy_extra_type *yyext,
1251 : const ScanKeywordList *keywordlist,
1252 : const uint16 *keyword_tokens)
1253 : {
1254 788124 : Size slen = strlen(str);
1255 : yyscan_t scanner;
1256 :
1257 788124 : if (yylex_init(&scanner) != 0)
1258 0 : elog(ERROR, "yylex_init() failed: %m");
1259 :
1260 788124 : core_yyset_extra(yyext, scanner);
1261 :
1262 788124 : yyext->keywordlist = keywordlist;
1263 788124 : yyext->keyword_tokens = keyword_tokens;
1264 :
1265 788124 : yyext->backslash_quote = backslash_quote;
1266 788124 : yyext->escape_string_warning = escape_string_warning;
1267 788124 : yyext->standard_conforming_strings = standard_conforming_strings;
1268 :
1269 : /*
1270 : * Make a scan buffer with special termination needed by flex.
1271 : */
1272 788124 : yyext->scanbuf = (char *) palloc(slen + 2);
1273 788124 : yyext->scanbuflen = slen;
1274 788124 : memcpy(yyext->scanbuf, str, slen);
1275 788124 : yyext->scanbuf[slen] = yyext->scanbuf[slen + 1] = YY_END_OF_BUFFER_CHAR;
1276 788124 : yy_scan_buffer(yyext->scanbuf, slen + 2, scanner);
1277 :
1278 : /* initialize literal buffer to a reasonable but expansible size */
1279 788124 : yyext->literalalloc = 1024;
1280 788124 : yyext->literalbuf = (char *) palloc(yyext->literalalloc);
1281 788124 : yyext->literallen = 0;
1282 :
1283 788124 : return scanner;
1284 : }
1285 :
1286 :
1287 : /*
1288 : * Called after parsing is done to clean up after scanner_init()
1289 : */
1290 : void
1291 786740 : scanner_finish(core_yyscan_t yyscanner)
1292 : {
1293 : /*
1294 : * We don't bother to call yylex_destroy(), because all it would do is
1295 : * pfree a small amount of control storage. It's cheaper to leak the
1296 : * storage until the parsing context is destroyed. The amount of space
1297 : * involved is usually negligible compared to the output parse tree
1298 : * anyway.
1299 : *
1300 : * We do bother to pfree the scanbuf and literal buffer, but only if they
1301 : * represent a nontrivial amount of space. The 8K cutoff is arbitrary.
1302 : */
1303 786740 : if (yyextra->scanbuflen >= 8192)
1304 92 : pfree(yyextra->scanbuf);
1305 786740 : if (yyextra->literalalloc >= 8192)
1306 48 : pfree(yyextra->literalbuf);
1307 786740 : }
1308 :
1309 :
1310 : static void
1311 815166 : addlit(char *ytext, int yleng, core_yyscan_t yyscanner)
1312 : {
1313 : /* enlarge buffer if needed */
1314 815166 : if ((yyextra->literallen + yleng) >= yyextra->literalalloc)
1315 : {
1316 234 : yyextra->literalalloc = pg_nextpower2_32(yyextra->literallen + yleng + 1);
1317 234 : yyextra->literalbuf = (char *) repalloc(yyextra->literalbuf,
1318 234 : yyextra->literalalloc);
1319 : }
1320 : /* append new data */
1321 815166 : memcpy(yyextra->literalbuf + yyextra->literallen, ytext, yleng);
1322 815166 : yyextra->literallen += yleng;
1323 815166 : }
1324 :
1325 :
1326 : static void
1327 22058 : addlitchar(unsigned char ychar, core_yyscan_t yyscanner)
1328 : {
1329 : /* enlarge buffer if needed */
1330 22058 : if ((yyextra->literallen + 1) >= yyextra->literalalloc)
1331 : {
1332 0 : yyextra->literalalloc *= 2;
1333 0 : yyextra->literalbuf = (char *) repalloc(yyextra->literalbuf,
1334 0 : yyextra->literalalloc);
1335 : }
1336 : /* append new data */
1337 22058 : yyextra->literalbuf[yyextra->literallen] = ychar;
1338 22058 : yyextra->literallen += 1;
1339 22058 : }
1340 :
1341 :
1342 : /*
1343 : * Create a palloc'd copy of literalbuf, adding a trailing null.
1344 : */
1345 : static char *
1346 817038 : litbufdup(core_yyscan_t yyscanner)
1347 : {
1348 817038 : int llen = yyextra->literallen;
1349 : char *new;
1350 :
1351 817038 : new = palloc(llen + 1);
1352 817038 : memcpy(new, yyextra->literalbuf, llen);
1353 817038 : new[llen] = '\0';
1354 817038 : return new;
1355 : }
1356 :
1357 : /*
1358 : * Process {decinteger}, {hexinteger}, etc. Note this will also do the right
1359 : * thing with {numeric}, ie digits and a decimal point.
1360 : */
1361 : static int
1362 488196 : process_integer_literal(const char *token, YYSTYPE *lval, int base)
1363 : {
1364 488196 : ErrorSaveContext escontext = {T_ErrorSaveContext};
1365 : int32 val;
1366 :
1367 488196 : val = pg_strtoint32_safe(token, (Node *) &escontext);
1368 488196 : if (escontext.error_occurred)
1369 : {
1370 : /* integer too large (or contains decimal pt), treat it as a float */
1371 1684 : lval->str = pstrdup(token);
1372 1684 : return FCONST;
1373 : }
1374 486512 : lval->ival = val;
1375 486512 : return ICONST;
1376 : }
1377 :
1378 : static void
1379 162 : addunicode(pg_wchar c, core_yyscan_t yyscanner)
1380 : {
1381 : ScannerCallbackState scbstate;
1382 : char buf[MAX_UNICODE_EQUIVALENT_STRING + 1];
1383 :
1384 162 : if (!is_valid_unicode_codepoint(c))
1385 6 : yyerror("invalid Unicode escape value");
1386 :
1387 : /*
1388 : * We expect that pg_unicode_to_server() will complain about any
1389 : * unconvertible code point, so we don't have to set saw_non_ascii.
1390 : */
1391 156 : setup_scanner_errposition_callback(&scbstate, yyscanner, *(yylloc));
1392 156 : pg_unicode_to_server(c, (unsigned char *) buf);
1393 156 : cancel_scanner_errposition_callback(&scbstate);
1394 156 : addlit(buf, strlen(buf), yyscanner);
1395 156 : }
1396 :
1397 : static unsigned char
1398 6142 : unescape_single_char(unsigned char c, core_yyscan_t yyscanner)
1399 : {
1400 6142 : switch (c)
1401 : {
1402 26 : case 'b':
1403 26 : return '\b';
1404 2 : case 'f':
1405 2 : return '\f';
1406 1310 : case 'n':
1407 1310 : return '\n';
1408 72 : case 'r':
1409 72 : return '\r';
1410 28 : case 't':
1411 28 : return '\t';
1412 0 : case 'v':
1413 0 : return '\v';
1414 4704 : default:
1415 : /* check for backslash followed by non-7-bit-ASCII */
1416 4704 : if (c == '\0' || IS_HIGHBIT_SET(c))
1417 0 : yyextra->saw_non_ascii = true;
1418 :
1419 4704 : return c;
1420 : }
1421 : }
1422 :
1423 : static void
1424 6142 : check_string_escape_warning(unsigned char ychar, core_yyscan_t yyscanner)
1425 : {
1426 6142 : if (ychar == '\'')
1427 : {
1428 36 : if (yyextra->warn_on_first_escape && yyextra->escape_string_warning)
1429 0 : ereport(WARNING,
1430 : (errcode(ERRCODE_NONSTANDARD_USE_OF_ESCAPE_CHARACTER),
1431 : errmsg("nonstandard use of \\' in a string literal"),
1432 : errhint("Use '' to write quotes in strings, or use the escape string syntax (E'...')."),
1433 : lexer_errposition()));
1434 36 : yyextra->warn_on_first_escape = false; /* warn only once per string */
1435 : }
1436 6106 : else if (ychar == '\\')
1437 : {
1438 4668 : if (yyextra->warn_on_first_escape && yyextra->escape_string_warning)
1439 64 : ereport(WARNING,
1440 : (errcode(ERRCODE_NONSTANDARD_USE_OF_ESCAPE_CHARACTER),
1441 : errmsg("nonstandard use of \\\\ in a string literal"),
1442 : errhint("Use the escape string syntax for backslashes, e.g., E'\\\\'."),
1443 : lexer_errposition()));
1444 4668 : yyextra->warn_on_first_escape = false; /* warn only once per string */
1445 : }
1446 : else
1447 1438 : check_escape_warning(yyscanner);
1448 6142 : }
1449 :
1450 : static void
1451 1738 : check_escape_warning(core_yyscan_t yyscanner)
1452 : {
1453 1738 : if (yyextra->warn_on_first_escape && yyextra->escape_string_warning)
1454 0 : ereport(WARNING,
1455 : (errcode(ERRCODE_NONSTANDARD_USE_OF_ESCAPE_CHARACTER),
1456 : errmsg("nonstandard use of escape in a string literal"),
1457 : errhint("Use the escape string syntax for escapes, e.g., E'\\r\\n'."),
1458 : lexer_errposition()));
1459 1738 : yyextra->warn_on_first_escape = false; /* warn only once per string */
1460 1738 : }
1461 :
1462 : /*
1463 : * Interface functions to make flex use palloc() instead of malloc().
1464 : * It'd be better to make these static, but flex insists otherwise.
1465 : */
1466 :
1467 : void *
1468 2364372 : core_yyalloc(yy_size_t bytes, core_yyscan_t yyscanner)
1469 : {
1470 2364372 : return palloc(bytes);
1471 : }
1472 :
1473 : void *
1474 0 : core_yyrealloc(void *ptr, yy_size_t bytes, core_yyscan_t yyscanner)
1475 : {
1476 0 : if (ptr)
1477 0 : return repalloc(ptr, bytes);
1478 : else
1479 0 : return palloc(bytes);
1480 : }
1481 :
1482 : void
1483 0 : core_yyfree(void *ptr, core_yyscan_t yyscanner)
1484 : {
1485 0 : if (ptr)
1486 0 : pfree(ptr);
1487 0 : }
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