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From: simpson@trwrb.UUCP (Scott Simpson)
Newsgroups: comp.sources.misc
Subject: Patches for LaTeX Index Processor
Message-ID: <4222@ncoast.UUCP>
Date: Wed, 19-Aug-87 21:59:43 EDT
Article-I.D.: ncoast.4222
Posted: Wed Aug 19 21:59:43 1987
Date-Received: Sat, 22-Aug-87 07:22:18 EDT
Sender: allbery@ncoast.UUCP
Lines: 73
Approved: allbery@ncoast.UUCP
X-Archive: comp.sources.misc/8708/35


Here are a set of patches for my LaTeX index processor.  There are a couple of
bugs.  An empty group such as
	\indexentry{\LaTeX{}}
causes a syntax error.  Also, the lexical analyzer does not look at
surrounding context when it encounters a comment character.  For example, in
	\indexentry{\verb"%"}
the text after the % is not passed to the parser.  Since LaTeX does not ever
generate comments, I just changed it so % is a normal character.  Here are the
diffs suitable for patch.
		Scott Simpson
		TRW Space and Defense Sector
		...{decvax,ihnp4,ucbvax}!trwrb!simpson

*** /usr/local/src/cmd/index/indexlex.l	Fri Jun 26 08:24:01 1987
--- indexlex.l	Mon Aug 17 10:29:06 1987
***************
*** 30,36
  			    strcpy(yylval.value, yytext);
  			    return(CONTROLSEQUENCE);
  			}
- \%.*\n			LineNo = EndLineNo++;	/* Comment. Don't pass to parser */
  {integer}		{
  			    LineNo = EndLineNo;
  			    strcpy(yylval.value, yytext);

--- 30,35 -----
  			    strcpy(yylval.value, yytext);
  			    return(CONTROLSEQUENCE);
  			}
  {integer}		{
  			    LineNo = EndLineNo;
  			    strcpy(yylval.value, yytext);
***************
*** 52,58
  			    strcpy(yylval.value, yytext);
  			    return(WHITESPACE);
  			}
! [^\\\{\}\%\, \t\n0-9]+	{
  			    LineNo = EndLineNo;
  			    strcpy(yylval.value, yytext);
  			    return(STRING);

--- 51,57 -----
  			    strcpy(yylval.value, yytext);
  			    return(WHITESPACE);
  			}
! [^\\\{\}\, \t\n0-9]+	{
  			    LineNo = EndLineNo;
  			    strcpy(yylval.value, yytext);
  			    return(STRING);
*** /usr/local/src/cmd/index/index.y	Fri Jun 26 08:24:00 1987
--- index.y	Mon Aug 17 10:29:06 1987
***************
*** 390,396
  	    $$ = $2;
  	}
      |
!     anyelement		/* Default action is $$ = $1 */
      ;
  
  anyelement :

--- 390,399 -----
  	    $$ = $2;
  	}
      |
! 	/* epsilon */
! 	{
! 	    ;	/* Do nothing */
! 	}
      ;
  
  anyelement :