actions before parsing rules in lex n yacc

Tags

parsing, programming, unresolved, unresolved for months, unresolved for weeks, yacc

Top Forums Programming actions before parsing rules in lex n yacc

11-26-2008

Registered User

1, 0

Join Date: Nov 2008

Last Activity: 26 November 2008, 5:02 AM EST

Posts: 1

Thanks Given: 0

Thanked 0 Times in 0 Posts

actions before parsing rules in lex n yacc

Hi ,

We have developed a grammer for our domain language using lex n yacc.
I want to know is there any pre defined lex-yacc function which gets call before executing any rule (or rules).
Oue requirement is, before processing any rule ,we want to perform some specific actions ?
is there any pre defined lex-yacc function which get call before processing rules?

In case of ANTLR (Another Tool for Language Recognition), we can specify actions before processing rule using a block "@init" . Is there anything like "@init" in lex n yacc ?

Regards,
Suprit

supritjain

View Public Profile for supritjain

Find all posts by supritjain

Previous Thread | Next Thread

7 More Discussions You Might Find Interesting

1. Programming

Yacc rogram

hello, actually i want to generate rgram in yacc able to do do several operations separated by ';' and after show all the results separated by ';' again. My code do just one operations and i couldn' t find solution to do several ones separated by ';'. I thought may be i can do a do... while but i...

2. Programming

Problem with Yacc

Hi guys, I'm struggling with a simple but at the same time complicated problem related to yacc :wall: Maybe someone can help me with this :confused: I'm working on a big project and it's hard for me to show the problem exactly on my code, but I will give a model of it. Before I had this kind...

3. Programming

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 Field2 " yacc/bison grammar: record :...

4. Programming

How to match n number of newline character(\n) in lex and yacc

Hi , I need to develop a parser which should match something like 1. text a=5 " a=20"; 2. text a=..." a=20"; 3 text a=..." a=20 b=34 c=12 "; I have used this regular expression in my Lex file to generate the tokens: \".\s*.*\s.\"

5. Programming

regarding lex regular expression

Hi all I am using lex for my application scanning and I need to skip some lines for which I don't know the exact pattern. So, could anybody tell me the regular expression to display lines NOT beginning with the specified pattern. I know how to display lines beginning with the...

6. Linux

lex for Chinese character

Hi, I need to read one chinese char using lex. I tried using "." ( period ) for pattern matching but in vain. Could anyone suggest me how do i proceeed. Sample pgm: to read a chinese char in single quotes. %{ #include <locale.h> %} %% \'.\' printf("SUCCESS\n"); . ...

7. Shell Programming and Scripting

probs compiling lex

this is my lex file ------------ test.l %% printf("%c",yytext+'a'-'A');.ECHO; how do i compile it $ lex test.l cc lex.yy.c -o test -ll <------| | if this is correct do i add this line--------| @the command line or does it...

Programming