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Full Discussion: parsing fixed length field with yacc/bison
Top Forums Programming parsing fixed length field with yacc/bison Post 302279115 by sungita on Thursday 22nd of January 2009 02:28:02 AM
Old 01-22-2009
Network parsing fixed length field with yacc/bison
How to specify the token length in a yacc file?
sample input format
<field1,data type ans,fixed length 6> followed by <field2,data type ans,fixed length 3>

Example i/p and o/p
Sample Input: "ab* d2 9o"
O/p : "Field1 [ab* d2] Field2 [ 9o] "

yacc/bison grammar:
record : AlphaNumericSpecialOfLength6 AlphaNAumericSpecialOfLength3
/** not like
record : FIELD1 FIELD2 { ....};
FIELD1 : ANS ANS ANS ANS ANS ANS;
FIELD2 : ANS ANS ANS { ...} ; ***/
{ printf("Field1 [%s] Field2 [%s] \n", $1 , $2); }

How to define grammar for this in yacc/bison?
 

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LEARN ABOUT SUSE

yacc

YACC(1) 							   User Commands							   YACC(1)

NAME

       yacc - GNU Project parser generator

SYNOPSIS

       yacc [OPTION]... FILE

DESCRIPTION

       Yacc (Yet Another Compiler Compiler) is a parser generator.  This version is a simple wrapper around bison(1).  It passes option -y, --yacc
       to activate the upward compatibility mode.  See bison(1) for more information.

AUTHOR

       Written by Paul Eggert.

REPORTING BUGS

       Report bugs to <bug-bison@gnu.org>.

COPYRIGHT

       Copyright (C) 2008 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       lex(1), flex(1), bison(1).

       The  full  documentation  for bison is maintained as a Texinfo manual.  If the info and bison programs are properly installed at your site,
       the command

	      info bison

       should give you access to the complete manual.

GNU Bison 2.4.1 						   November 2007							   YACC(1)
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