Function plpgsql_yyerror

src/pl/plpgsql/src/pl_scanner.c:501–530

* plpgsql_yyerror * Report a lexer or grammar error. * * The message's cursor position refers to the current token (the one * last returned by plpgsql_yylex()). * This is OK for syntax error messages from the Bison parser, because Bison * parsers report error as soon as the first unparsable token is reached. * Beware of using yyerror for other purposes, as the cursor position might * be m

 * be misleading!
 */
void
plpgsql_yyerror(const char *message)
{
	char	   *yytext = core_yy.scanbuf + plpgsql_yylloc;

	if (*yytext == '\0')
	{
		ereport(ERROR,
				(errcode(ERRCODE_SYNTAX_ERROR),
		/* translator: %s is typically the translation of "syntax error" */
				 errmsg("%s at end of input", _(message)),
				 plpgsql_scanner_errposition(plpgsql_yylloc)));
	}
	else
	{
		/*
		 * If we have done any lookahead then flex will have restored the
		 * character after the end-of-token.  Zap it again so that we report
		 * only the single token here.  This modifies scanbuf but we no longer
		 * care about that.
		 */
		yytext[plpgsql_yyleng] = '\0';

		ereport(ERROR,
				(errcode(ERRCODE_SYNTAX_ERROR),
		/* translator: first %s is typically the translation of "syntax error" */
				 errmsg("%s at or near \"%s\"", _(message), yytext),
				 plpgsql_scanner_errposition(plpgsql_yylloc)));
	}
}

/*
 * Given a location (a byte offset in the function source text),