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%{
/*-------------------------------------------------------------------------
*
* exprscan.l
* a lexical scanner for a simple expression syntax
*
* Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*-------------------------------------------------------------------------
*/
/* line and column number for error reporting */
static int yyline = 0, yycol = 0;
/* Handles to the buffer that the lexer uses internally */
static YY_BUFFER_STATE scanbufhandle;
static char *scanbuf;
static int scanbuflen;
%}
%option 8bit
%option never-interactive
%option nodefault
%option noinput
%option nounput
%option noyywrap
%option warn
%option prefix="expr_yy"
space [ \t\r\f]
%%
"+" { yycol += yyleng; return '+'; }
"-" { yycol += yyleng; return '-'; }
"*" { yycol += yyleng; return '*'; }
"/" { yycol += yyleng; return '/'; }
"%" { yycol += yyleng; return '%'; }
"(" { yycol += yyleng; return '('; }
")" { yycol += yyleng; return ')'; }
:[a-zA-Z0-9_]+ {
yycol += yyleng;
yylval.str = pg_strdup(yytext + 1);
return VARIABLE;
}
[0-9]+ {
yycol += yyleng;
yylval.ival = strtoint64(yytext);
return INTEGER;
}
[\n] { yycol = 0; yyline++; }
{space}+ { yycol += yyleng; /* ignore */ }
. {
yycol += yyleng;
fprintf(stderr, "unexpected character \"%s\"\n", yytext);
return CHAR_ERROR;
}
%%
void
yyerror(const char *message)
{
/* yyline is always 1 as pgbench calls the parser for each line...
* so the interesting location information is the column number */
fprintf(stderr, "%s at column %d\n", message, yycol);
/* go on to raise the error from pgbench with more information */
}
/*
* Called before any actual parsing is done
*/
void
expr_scanner_init(const char *str)
{
Size slen = strlen(str);
/*
* Might be left over after error
*/
if (YY_CURRENT_BUFFER)
yy_delete_buffer(YY_CURRENT_BUFFER);
/*
* Make a scan buffer with special termination needed by flex.
*/
scanbuflen = slen;
scanbuf = pg_malloc(slen + 2);
memcpy(scanbuf, str, slen);
scanbuf[slen] = scanbuf[slen + 1] = YY_END_OF_BUFFER_CHAR;
scanbufhandle = yy_scan_buffer(scanbuf, slen + 2);
BEGIN(INITIAL);
}
/*
* Called after parsing is done to clean up after seg_scanner_init()
*/
void
expr_scanner_finish(void)
{
yy_delete_buffer(scanbufhandle);
pg_free(scanbuf);
}
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