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Need Help in parsing using Bison
Joined: 25 Jun 2003
Posts: 1
Need Help in parsing using Bison
Hello friends ,
We are writing a parser for Httpd.conf
(Configuration file of Apache Server ) .
in this file`s second section there are many directives like
1.
<Directory >
...........
..........
</Directory>
<IfModule mod_dir.c>
...........
..........
</IfModule>
we have written parser for all thses directives but in if directive
we have nested if like this :
<IfModule mod_dir.c>
...........
..........
<IfModule mod_dir.c>
...........
</IfModule>
</IfModule>
our grammar is not working please suggest some other grammer our code
is included below
first file is Flex file ,second is bison file , third is the
configuration file containing the peice of
code to be parsed . and fourth is makefile so plz have a look .
Thanking you in Advance
-----------------------------------------
Flex File
----------------------------------------
%{
#include"ar.tab.h"
%}
%%
[
] {}
#.* {}
(<IfModule.*.[c|C]>) {printf("
If beg seen "); return(tbIF);}
"</IfModule>" {printf("
If end seen "); return
(teIF); }
DirectoryIndex.* {printf("
Dir If seen ");return
(tIFENTRY);}
UserDir.* {printf("
User If seen ");return
(tIFENTRY);}
MIMEMagicFile.* {printf("
MiME if seen "); return
(tIFENTRY);}
AddIcon.* {printf("
AddIcon IF seen "); return(tIFENTRY);}
DefaultIcon.* {printf("
default Icon IF seen "); return
(tIFENTRY);}
ReadmeName.* {printf("
readrName IF seen "); return(tIFENTRY);}
HeaderName.* {printf("
HeaderName IF seen "); return(tIFENTRY);}
IndexIgnore.* {printf("
Index Ignored IF seen "); return
(tIFENTRY);}
IndexOptions.* {printf("
Index Option IF seen "); return
(tIFENTRY);}
BrowserMatch.* {printf("
Brows IF seen "); return
(tIFENTRY);}
AddEncoding.* {printf("
AddEncoding IF seen "); return
(tIFENTRY);}
AddLanguage.* {printf("
AddLanguage IF seen "); return
(tIFENTRY);}
AddCharset.* {printf("
AddCharset IF seen "); return
(tIFENTRY);}
LanguagePriority.* {printf("
LanguagePriority IF seen "); return
(tIFENTRY);}
AddType.* {printf("
AddType IF seen "); return(tIFENTRY);}
%%
main1()
{
yyin=fopen("ar.conf","r");
if(!yyin)
{
{printf("
Error in file I/O
");}
exit(1);
}
yylex();
}
---------------------------
Bison File
---------------------------
%{
%}
%token tbIF teIF tIFENTRY
%%
IF : tbIF OPTIONAL_ENTRY_OF_IF teIF IF { printf("
Done
"); } |
OPTIONAL_ENTRY_OF_IF : tIFENTRY OPTIONAL_ENTRY_OF_IF | IF |;
%%
extern FILE *yyin;
main()
{
yyin=fopen("ar.conf","r");
if(!yyin)
{
{printf("
Error in file I/O
");}
exit(1);
}
do {
yyparse();
} while(!feof(yyin));
}
yyerror(char *s )
{
printf("
Parsing Error : %s
",s);
}
------------------------------
Configuration file to be parsed
-----------------------------
<IfModule mod_dir.c>
DirectoryIndex index.html index.php index.htm index.shtml
index.cgi
</IfModule>
<IfModule mod_userdir.c>
UserDir public_html
</IfModule>
<IfModule mod_mime_magic.c>
MIMEMagicFile share/magic
</IfModule>
<IfModule mod_autoindex.c>
#
# FancyIndexing: whether you want fancy directory indexing or
standard
#
IndexOptions FancyIndexing NameWidth=*
#
# AddIcon* directives tell the server which icon to show for
different
# files or filename extensions. These are only displayed for
# FancyIndexed directories.
#
AddIconByEncoding (CMP,/icons/compressed.gif) x-compress x-gzip
AddIconByType (TXT,/icons/text.gif) text/*
AddIconByType (IMG,/icons/image2.gif) image/*
AddIconByType (SND,/icons/sound2.gif) audio/*
AddIconByType (VID,/icons/movie.gif) video/*
AddIcon /icons/binary.gif .bin .exe
AddIcon /icons/binhex.gif .hqx
AddIcon /icons/tar.gif .tar
AddIcon /icons/world2.gif .wrl .wrl.gz .vrml .vrm .iv
AddIcon /icons/compressed.gif .Z .z .tgz .gz .zip
AddIcon /icons/a.gif .ps .ai .eps
AddIcon /icons/layout.gif .html .shtml .htm .pdf
AddIcon /icons/text.gif .txt
AddIcon /icons/c.gif .c
AddIcon /icons/p.gif .pl .py
AddIcon /icons/f.gif .for
AddIcon /icons/dvi.gif .dvi
AddIcon /icons/uuencoded.gif .uu
AddIcon /icons/script.gif .conf .sh .shar .csh .ksh .tcl
AddIcon /icons/tex.gif .tex
AddIcon /icons/bomb.gif core
AddIcon /icons/deb.gif .deb
AddIcon /icons/back.gif ..
AddIcon /icons/hand.right.gif README
AddIcon /icons/folder.gif ^^DIRECTORY^^
AddIcon /icons/blank.gif ^^BLANKICON^^
#
# DefaultIcon: which icon to show for files which do not have an
icon
# explicitly set.
#
DefaultIcon /icons/unknown.gif
#
# AddDescription: allows you to place a short description after a
file in
# server-generated indexes. These are only displayed for
FancyIndexed
# directories.
# Format: AddDescription "description" filename
#
#AddDescription "GZIP compressed document" .gz
#AddDescription "tar archive" .tar
#AddDescription "GZIP compressed tar archive" .tgz
#
# ReadmeName: the name of the README file the server will look
for by
# default, and append to directory listings.
#
# HeaderName: the name of a file which should be prepended to
# directory indexes.
#
# The server will first look for name.html and include it if
found.
# If name.html doesn`t exist, the server will then look for
name.txt
# and include it as plaintext if found.
#
ReadmeName README
HeaderName HEADER
#
# IndexIgnore: a set of filenames which directory indexing should
ignore
# and not include in the listing. Shell-style wildcarding is
permitted.
#
IndexIgnore .??* *~ *# HEADER* README* RCS CVS *,v *,t
</IfModule>
<IfModule mod_setenvif.c>
#
# The following directives modify normal HTTP response behavior.
# The first directive disables keepalive for Netscape 2.x and
browsers that
# spoof it. There are known problems with these browser
implementations.
# The second directive is for Microsoft Internet Explorer 4.0b2
# which has a broken HTTP/1.1 implementation and does not properly
# support keepalive when it is used on 301 or 302 (redirect)
responses.
#
BrowserMatch "Mozilla/2" nokeepalive
BrowserMatch "MSIE 4.0b2;" nokeepalive downgrade-1.0 force-
response-1.0
#
# The following directive disables HTTP/1.1 responses to browsers
which
# are in violation of the HTTP/1.0 spec by not being able to grok
a
# basic 1.1 response.
#
BrowserMatch "RealPlayer 4.0" force-response-1.0
BrowserMatch "Java/1.0" force-response-1.0
BrowserMatch "JDK/1.0" force-response-1.0
</IfModule>
<IfModule mod_mime.c>
# AddEncoding allows you to have certain browsers (Mosaic/X 2.1+)
# uncompress information on the fly. Note: Not all browsers
support
# this. Despite the name similarity, the following Add*
directives
# have nothing to do with the FancyIndexing customization
# directives above.
AddEncoding x-compress Z
AddEncoding x-gzip gz tgz
#
# AddLanguage: allows you to specify the language of a document.
You can
# then use content negotiation to give a browser a file in a
language
# it can understand.
#
# Note 1: The suffix does not have to be the same as the language
# keyword --- those with documents in Polish (whose net-standard
# language code is pl) may wish to use "AddLanguage pl .po" to
# avoid the ambiguity with the common suffix for perl scripts.
#
# Note 2: The example entries below illustrate that in quite
# some cases the two character `Language` abbriviation is not
# identical to the two character `Country` code for its country,
# E.g. `Danmark/dk` versus `Danish/da`.
#
# Note 3: In the case of `ltz` we violate the RFC by using a
three char
# specifier. But there is `work in progress` to fix this and get
# the reference data for rfc1766 cleaned up.
#
# Danish (da) - Dutch (nl) - English (en) - Estonian (ee)
# French (fr) - German (de) - Greek-Modern (el)
# Italian (it) - Portugese (pt) - Luxembourgeois* (ltz)
# Spanish (es) - Swedish (sv) - Catalan (ca) - Czech(cz)
# Polish (pl) - Brazilian Portuguese (pt-br) - Japanese (ja)
#
AddLanguage da .dk
AddLanguage nl .nl
AddLanguage en .en
AddLanguage et .ee
AddLanguage fr .fr
AddLanguage de .de
AddLanguage el .el
AddLanguage it .it
AddLanguage ja .ja
AddCharset ISO-2022-JP .jis
AddLanguage pl .po
AddCharset ISO-8859-2 .iso-pl
AddLanguage pt .pt
AddLanguage pt-br .pt-br
AddLanguage ltz .lu
AddLanguage ca .ca
AddLanguage es .es
AddLanguage sv .se
AddLanguage cz .cz
# LanguagePriority: allows you to give precedence to some
languages
# in case of a tie during content negotiation.
#
# Just list the languages in decreasing order of preference. We
have
# more or less alphabetized them here. You probably want to change
# this.
#
<IfModule mod_negotiation.c>
LanguagePriority en da nl et fr de el it ja pl pt pt-br ltz ca
es sv
</IfModule>
#
# AddType allows you to tweak mime.types without actually editing
# it, or to make certain files to be certain types.
#
# For example, the PHP 3.x module (not part of the Apache
# distribution - see http://www.php.net) will typically use:
#
#AddType application/x-httpd-php3 .php3
#AddType application/x-httpd-php3-source .phps
#
# And for PHP 4.x, use:
#
#AddType application/x-httpd-php .php
#AddType application/x-httpd-php-source .phps
AddType application/x-tar .tgz
AddType image/bmp .bmp
# hdml
AddType text/x-hdml .hdml
#
# AddHandler allows you to map certain file extensions
to "handlers",
# actions unrelated to filetype. These can be either built into
# the server or added with the Action command (see below).
#
# If you want to use server side includes, or CGI outside
# ScriptAliased directories, uncomment the following lines.
#
# To use CGI scripts:
#
#AddHandler cgi-script .cgi .sh .pl
#
# To use server-parsed HTML files
#
#AddType text/html .shtml
#AddHandler server-parsed .shtml
#
# Uncomment the following line to enable Apache`s send-asis HTTP
# file feature.
#
#AddHandler send-as-is asis
#
# If you wish to use server-parsed imagemap files, use
#
#AddHandler imap-file map
#
# To enable type maps, you might want to use
#
#AddHandler type-map var
</IfModule>
-------------------------
Makefile
------------------------
test : lex.yy.o ar.tab.o
gcc -o test lex.yy.o ar.tab.o -lfl
ar.tab.o : ar.tab.c
gcc -c ar.tab.c
ar.tab.c ar.tab.h : ar.y
bison -d ar.y
lex.yy.o : lex.yy.c ar.tab.h
gcc -c lex.yy.c
lex.yy.c : ar.l
flex ar.l
clean:
@echo "Removing object files..."
rm -f *.o *.c
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