tests/lineno.rules - master - niceSOFT/flex

tests/lineno.rules
71 строка2 KB
musvaage
typos
22 авг 2023, 18:35
22 авг 2023, 18:35d7d1c54
/*
 * This file is part of flex.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the University nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.
 */

/* The goal here is to test the yylineno processing by:
 *      - providing some rules than CAN match newlines and
 *        other rules that can NOT match newlines,
 *      - matching several newlines in one rule,
 *      - directly modifying yylineno.
 * FIXME: Exposes a bug, probably in the Flex scanner.
 * If "--yylineno" in the action is "yylineno--", the pattern
 * is not recognized and the magic rewrite rule for yylineo
 * does not fire.  Only an issue for non-default back ends that
 * do magic rewrites rather than relying on the C preprocessor.
 */
%option 8bit
%option nounput nomain noyywrap noinput yylineno
%option warn

WORD [[:alpha:]]+
DIGIT [[:digit:]]

%%
"yylineno++"          M4_TEST_INCREMENT(yylineno);
"yylineno--"          M4_TEST_DECREMENT(yylineno);
[[:blank:]]+
{WORD}
{DIGIT}+(\n{DIGIT}+)*
\n
.
<<EOF>>  {M4_TEST_ASSERT(yylineno == 20) M4_TEST_DO(yyterminate())}

###
These words
are separated
by newlines
and sometimes
    spaces  
too.
The next three lines are numbers with only intervening newlines
01123
581321
34
And now for some blank lines....


Finally, we directly modify yylineno, but then change it back afterwards
(see scanner.l):

yylineno++

yylineno--