169 lines
3.2 KiB
Plaintext
169 lines
3.2 KiB
Plaintext
%{
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/*-------------------------------------------------------------------------
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*
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* repl_scanner.l
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* a lexical scanner for the replication commands
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*
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* Portions Copyright (c) 1996-2011, 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/repl_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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/* 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) ereport(ERROR, (errmsg_internal("%s", msg)))
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/* Handle to the buffer that the lexer uses internally */
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static YY_BUFFER_STATE scanbufhandle;
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static StringInfoData litbuf;
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static void startlit(void);
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static char *litbufdup(void);
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static void addlit(char *ytext, int yleng);
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static void addlitchar(unsigned char ychar);
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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="replication_yy"
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%x xq
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/* Extended quote
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* xqdouble implements embedded quote, ''''
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*/
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xqstart {quote}
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xqdouble {quote}{quote}
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xqinside [^']+
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hexdigit [0-9A-Za-z]+
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quote '
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quotestop {quote}
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%%
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BASE_BACKUP { return K_BASE_BACKUP; }
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IDENTIFY_SYSTEM { return K_IDENTIFY_SYSTEM; }
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LABEL { return K_LABEL; }
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PROGRESS { return K_PROGRESS; }
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START_REPLICATION { return K_START_REPLICATION; }
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"," { return ','; }
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";" { return ';'; }
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[\n] ;
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[\t] ;
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" " ;
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{hexdigit}+\/{hexdigit}+ {
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if (sscanf(yytext, "%X/%X", &yylval.recptr.xlogid, &yylval.recptr.xrecoff) != 2)
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yyerror("invalid streaming start location");
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return RECPTR;
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}
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{xqstart} {
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BEGIN(xq);
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startlit();
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}
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<xq>{quotestop} {
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yyless(1);
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BEGIN(INITIAL);
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yylval.str = litbufdup();
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return SCONST;
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}
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<xq>{xqdouble} {
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addlitchar('\'');
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}
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<xq>{xqinside} {
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addlit(yytext, yyleng);
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}
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<xq><<EOF>> { yyerror("unterminated quoted string"); }
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<<EOF>> {
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yyterminate();
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}
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. {
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ereport(ERROR,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("syntax error: unexpected character \"%s\"", yytext)));
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}
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%%
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static void
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startlit(void)
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{
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initStringInfo(&litbuf);
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}
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static char *
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litbufdup(void)
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{
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return litbuf.data;
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}
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static void
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addlit(char *ytext, int yleng)
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{
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appendBinaryStringInfo(&litbuf, ytext, yleng);
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}
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static void
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addlitchar(unsigned char ychar)
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{
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appendStringInfoChar(&litbuf, ychar);
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}
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void
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yyerror(const char *message)
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{
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ereport(ERROR,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg_internal("%s", message)));
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}
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void
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replication_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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}
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void
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replication_scanner_finish()
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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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