Unexpected parsing error in Gawk

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3 total messages Started by Cesar Quiroz Mon, 02 Oct 1989 22:29

#464

Author: Cesar Quiroz
Date: Mon, 02 Oct 1989 22:29

37 lines
1828 bytes

Consider the line marked `*' in this program:

    gawk '
    BEGIN                       {   inleader=1; trailers=0  }
    /^[ \t]*$/ && inleader      {   next }
    inleader                    {   inleader = 0; print; next }
*   !inleader && /^[ \t]*$/     {   trailers++; next }
    !inleader                   {   for (i=0; i<trailers; i++) printf "\n";
                                    print; trailers=0; next }
    '

Gnu Awk (gawk) 2.10beta 07 Apr 1989 complains about it:

    gawk:  syntax error near line 5:
    !inleader && /^[ \t]*$/     {   trailers++; next }


                   ^ parse error


However, it parses correctly this version:

    /^[ \t]*$/ && !inleader     {   trailers++; next }

[Aside: indeed, I can just drop the check on inleader in that
script, that is not the point.]  In awk.y, the rule for simp_pattern
is suspect; I don't see how to generate the simple pattern
expression LEX_AND regexp.  Perhaps it would be better to generate
expressions, simple regexps and dynamic regexps.  Then derive
patterns from these three.

Thanks!
-- 
                                      Cesar Augusto Quiroz Gonzalez
                                      Department of Computer Science
                                      University of Rochester
                                      Rochester,  NY 14627

Re: Unexpected parsing error in Gawk

#477

Author: Arnold D. Robbins {EUCC}
Date: Sun, 08 Oct 1989 13:49

16 lines
1115 bytes

In article <1989Oct2.222916.4588@cs.rochester.edu> quiroz@cs.rochester.edu (Cesar Quiroz) writes:
>Consider the line marked `*' in this program:
>
>*   !inleader && /^[ \t]*$/     {   trailers++; next }

This has been fixed in GAWK 2.11, scheduled for release Real Soon Now.

INEWS FODDER
INEWS FODDER
INEWS FODDER
INEWS FODDER
-- 
Arnold Robbins -- Emory U. Information Technology Div.  | Laundry increases
DOMAIN: arnold@emoryu1.cc.emory.edu			| exponentially in the
UUCP: gatech!emoryu1!arnold  PHONE: +1 404 727-7636	| number of children.
BITNET: arnold@emoryu1	     FAX:   +1 404 727-2599	|   -- Miriam Hartholz

Re: Unexpected parsing error in Gawk

#482

Author: Arnold D. Robbins {EUCC}
Date: Tue, 10 Oct 1989 14:12

17 lines
1387 bytes

In article <1989Oct2.222916.4588@cs.rochester.edu> quiroz@cs.rochester.edu (Cesar Quiroz) writes:
}}Consider the line marked `*' in this program:
}}
}}*   !inleader && /^[ \t]*$/     {   trailers++; next }

In article <4422@emory.mathcs.emory.edu> arnold@emory.UUCP (Arnold D. Robbins {EUCC}) writes:
>This has been fixed in GAWK 2.11, scheduled for release Real Soon Now.

Sigh.  I spoke too soon.  It is still broke in 2.11.  But it should be fixed
(I hope) by the time 2.11 is out.

There's Always One More Bug!
-- 
Arnold Robbins -- Emory U. Information Technology Div.  | Laundry increases
DOMAIN: arnold@emoryu1.cc.emory.edu			| exponentially in the
UUCP: gatech!emoryu1!arnold  PHONE: +1 404 727-7636	| number of children.
BITNET: arnold@emoryu1	     FAX:   +1 404 727-2599	|   -- Miriam Hartholz

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