173 lines
3.4 KiB
Plaintext
173 lines
3.4 KiB
Plaintext
%top{
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/*-------------------------------------------------------------------------
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*
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* syncrep_scanner.l
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* a lexical scanner for synchronous_standby_names
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*
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* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/replication/syncrep_scanner.l
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "lib/stringinfo.h"
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/*
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* NB: include syncrep_gram.h only AFTER including syncrep.h, because syncrep.h
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* includes node definitions needed for YYSTYPE.
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*/
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#include "replication/syncrep.h"
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#include "syncrep_gram.h"
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}
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%{
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/* Avoid exit() on fatal scanner errors (a bit ugly -- see yy_fatal_error) */
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#undef fprintf
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#define fprintf(file, fmt, msg) fprintf_to_ereport(fmt, msg)
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static void
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fprintf_to_ereport(const char *fmt, const char *msg)
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{
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ereport(ERROR, (errmsg_internal("%s", msg)));
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}
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/* Handles to the buffer that the lexer uses internally */
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static YY_BUFFER_STATE scanbufhandle;
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static StringInfoData xdbuf;
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/* LCOV_EXCL_START */
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%}
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%option 8bit
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%option never-interactive
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%option nodefault
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%option noinput
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%option nounput
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%option noyywrap
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%option warn
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%option prefix="syncrep_yy"
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/*
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* <xd> delimited identifiers (double-quoted identifiers)
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*/
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%x xd
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space [ \t\n\r\f\v]
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digit [0-9]
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ident_start [A-Za-z\200-\377_]
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ident_cont [A-Za-z\200-\377_0-9\$]
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identifier {ident_start}{ident_cont}*
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dquote \"
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xdstart {dquote}
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xdstop {dquote}
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xddouble {dquote}{dquote}
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xdinside [^"]+
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%%
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{space}+ { /* ignore */ }
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/* brute-force case insensitivity is safer than relying on flex -i */
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[Aa][Nn][Yy] { return ANY; }
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[Ff][Ii][Rr][Ss][Tt] { return FIRST; }
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{xdstart} {
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initStringInfo(&xdbuf);
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BEGIN(xd);
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}
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<xd>{xddouble} {
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appendStringInfoChar(&xdbuf, '"');
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}
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<xd>{xdinside} {
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appendStringInfoString(&xdbuf, yytext);
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}
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<xd>{xdstop} {
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syncrep_yylval.str = xdbuf.data;
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xdbuf.data = NULL;
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BEGIN(INITIAL);
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return NAME;
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}
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<xd><<EOF>> {
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syncrep_yyerror("unterminated quoted identifier");
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return JUNK;
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}
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{identifier} {
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syncrep_yylval.str = pstrdup(yytext);
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return NAME;
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}
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{digit}+ {
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syncrep_yylval.str = pstrdup(yytext);
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return NUM;
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}
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"*" {
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syncrep_yylval.str = "*";
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return NAME;
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}
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"," { return ','; }
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"(" { return '('; }
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")" { return ')'; }
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. { return JUNK; }
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%%
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/* LCOV_EXCL_STOP */
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/* Needs to be here for access to yytext */
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void
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syncrep_yyerror(const char *message)
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{
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/* report only the first error in a parse operation */
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if (syncrep_parse_error_msg)
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return;
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if (yytext[0])
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syncrep_parse_error_msg = psprintf("%s at or near \"%s\"",
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message, yytext);
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else
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syncrep_parse_error_msg = psprintf("%s at end of input",
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message);
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}
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void
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syncrep_scanner_init(const char *str)
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{
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Size slen = strlen(str);
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char *scanbuf;
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/*
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* Might be left over after ereport()
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*/
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if (YY_CURRENT_BUFFER)
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yy_delete_buffer(YY_CURRENT_BUFFER);
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/*
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* Make a scan buffer with special termination needed by flex.
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*/
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scanbuf = (char *) palloc(slen + 2);
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memcpy(scanbuf, str, slen);
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scanbuf[slen] = scanbuf[slen + 1] = YY_END_OF_BUFFER_CHAR;
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scanbufhandle = yy_scan_buffer(scanbuf, slen + 2);
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/* Make sure we start in proper state */
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BEGIN(INITIAL);
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}
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void
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syncrep_scanner_finish(void)
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{
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yy_delete_buffer(scanbufhandle);
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scanbufhandle = NULL;
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}
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