Function plpgsql_scanner_init

src/pl/plpgsql/src/pl_scanner.c:588–635

* 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. */

 * to cite in error messages.
 */
void
plpgsql_scanner_init(const char *str)
{
	/*
	 * In GPDB, temporarily disable escape_string_warning, if we're in a QE
	 * node. When we're parsing a PL/pgSQL function, e.g. in a CREATE FUNCTION
	 * command, you should've gotten the same warning from the QD node already.
	 * We could probably disable the warning in QE nodes altogether, not just
	 * in PL/pgSQL, but it can be useful for catching escaping bugs, when
	 * internal queries are dispatched from QD to QEs.
	 */
	bool            save_escape_string_warning = escape_string_warning;
	PG_TRY();
	{
		if (Gp_role == GP_ROLE_EXECUTE)
			escape_string_warning = false;

		/* Start up the core scanner */
		yyscanner = scanner_init(str, &core_yy,
								 &ReservedPLKeywords, ReservedPLKeywordTokens);

		if (Gp_role == GP_ROLE_EXECUTE)
			escape_string_warning = save_escape_string_warning;
	}
	PG_CATCH();
	{
		if (Gp_role == GP_ROLE_EXECUTE)
			escape_string_warning = save_escape_string_warning;
		PG_RE_THROW();
	}
	PG_END_TRY();

	/*
	 * 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;
	plpgsql_yytoken = 0;

	num_pushbacks = 0;

	location_lineno_init();
}

/*
 * Called after parsing is done to clean up after plpgsql_scanner_init()