/*
* Given a location (a byte offset in the function source text),
* return a line number.
*
* We expect that this is typically called for a sequence of increasing
* location values, so optimize accordingly by tracking the endpoints
* of the "current" line.
*/
int
plpgsql_location_to_lineno(int location)
{
const char *loc;
if (location < 0 || scanorig == NULL)
return 0; /* garbage in, garbage out */
loc = scanorig + location;
/* be correct, but not fast, if input location goes backwards */
if (loc < cur_line_start)
location_lineno_init();
while (cur_line_end != NULL && loc > cur_line_end)
{
cur_line_start = cur_line_end + 1;
cur_line_num++;
cur_line_end = strchr(cur_line_start, '\n');
}
return cur_line_num;
}
/*
* Called before any actual parsing is done
*
* Note: the passed "str" must remain valid until plpgsql_scanner_finish().
* Although it is not fed directly to flex, we need the original string
* to cite in error messages.
*/
void
plpgsql_scanner_init(const char *str)
{
/* Start up the core scanner */
yyscanner = scanner_init(str, &core_yy,
reserved_keywords, num_reserved_keywords);
/*
* scanorig points to the original string, which unlike the scanner's
* scanbuf won't be modified on-the-fly by flex. Notice that although
* yytext points into scanbuf, we rely on being able to apply locations
* (offsets from string start) to scanorig as well.
*/
scanorig = str;
/* Other setup */
plpgsql_IdentifierLookup = IDENTIFIER_LOOKUP_NORMAL;
num_pushbacks = 0;
location_lineno_init();
}