10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Alright, so I'm writing a file for the lexical analyzer (lex). It will be used to check C code (collecting the identifiers and storing those names along with the line numbers the identifier was found on). I'm not used to 'C' so I'm having some difficulty.
I am using a function (insertId()) to... (4 Replies)
Discussion started by: D2K
4 Replies
2. UNIX for Dummies Questions & Answers
Hi everyone!
This is my very first post, sorry if I'm not posting in the right category.
I'm trying to match a newline "/n" using lex/yacc.
For example,
print(9,'\n',8)
should print
9
8
now do I write a regular expression to match exactly " '\n' "
Thanks! (1 Reply)
Discussion started by: code21
1 Replies
3. Programming
When i write the source code in netbeans environment,if the source code,there are chinese characters,chinese characters will be displayed as box,how to solve this problem?please (2 Replies)
Discussion started by: fang_xiaoan
2 Replies
4. Programming
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... (0 Replies)
Discussion started by: supritjain
0 Replies
5. Programming
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.\" (8 Replies)
Discussion started by: vishwa787
8 Replies
6. Solaris
Hi everyone,
I would like to know how to compile and run lex programs on solaris 10.
the conventional way is
$ lex <name.l>
$ cc lex.yy.c -ll
$ ./a.out
but while trying to execute the 2nd command :i get a reference saying that the command is old or that main is not supported...
Hence... (1 Reply)
Discussion started by: wrapster
1 Replies
7. Programming
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... (1 Reply)
Discussion started by: axes
1 Replies
8. Programming
Hi all,
I'm working with flex (version 2.5.4a) on GNU/linux. I used it to develop 4 scanner C files for matching different patterns within an input file. But the problem now on my hand is that I need to conditionally combine these. That is in main (placed in a separate C file other than the 4... (5 Replies)
Discussion started by: Rakesh Ranjan
5 Replies
9. Shell Programming and Scripting
taskes one or more .l files and compiles them
#!/usr/bin/csh
#while loop to carry on asking user to enter the files
while $number!=0
echo "enter file name"
#check to see if file ends with .l
#if file ends with .l compile lexx.yy.c file for each file
this is how i think it needs... (1 Reply)
Discussion started by: homerj546
1 Replies
10. Shell Programming and Scripting
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... (0 Replies)
Discussion started by: sinner
0 Replies
FLEX(1) User Commands FLEX(1)
NAME
flex - the fast lexical analyser generator
SYNOPSIS
flex [OPTIONS] [FILE]...
DESCRIPTION
Generates programs that perform pattern-matching on text.
Table Compression:
-Ca, --align
trade off larger tables for better memory alignment
-Ce, --ecs
construct equivalence classes
-Cf do not compress tables; use -f representation
-CF do not compress tables; use -F representation
-Cm, --meta-ecs
construct meta-equivalence classes
-Cr, --read
use read() instead of stdio for scanner input
-f, --full
generate fast, large scanner. Same as -Cfr
-F, --fast
use alternate table representation. Same as -CFr
-Cem default compression (same as --ecs --meta-ecs)
Debugging:
-d, --debug
enable debug mode in scanner
-b, --backup
write backing-up information to lex.backup
-p, --perf-report
write performance report to stderr
-s, --nodefault
suppress default rule to ECHO unmatched text
-T, --trace
flex should run in trace mode
-w, --nowarn
do not generate warnings
-v, --verbose
write summary of scanner statistics to stdout
Files:
-o, --outfile=FILE
specify output filename
-S, --skel=FILE
specify skeleton file
-t, --stdout
write scanner on stdout instead of lex.yy.c
--yyclass=NAME
name of C++ class
--header-file=FILE
create a C header file in addition to the scanner
--tables-file[=FILE] write tables to FILE
Scanner behavior:
-7, --7bit
generate 7-bit scanner
-8, --8bit
generate 8-bit scanner
-B, --batch
generate batch scanner (opposite of -I)
-i, --case-insensitive
ignore case in patterns
-l, --lex-compat
maximal compatibility with original lex
-X, --posix-compat
maximal compatibility with POSIX lex
-I, --interactive
generate interactive scanner (opposite of -B)
--yylineno
track line count in yylineno
Generated code:
-+, --c++
generate C++ scanner class
-Dmacro[=defn]
#define macro defn (default defn is '1')
-L, --noline
suppress #line directives in scanner
-P, --prefix=STRING
use STRING as prefix instead of "yy"
-R, --reentrant
generate a reentrant C scanner
--bison-bridge
scanner for bison pure parser.
--bison-locations
include yylloc support.
--stdinit
initialize yyin/yyout to stdin/stdout
--noansi-definitions old-style function definitions
--noansi-prototypes
empty parameter list in prototypes
--nounistd
do not include <unistd.h>
--noFUNCTION
do not generate a particular FUNCTION
Miscellaneous:
-c do-nothing POSIX option
-n do-nothing POSIX option
-?
-h, --help
produce this help message
-V, --version
report flex version
SEE ALSO
The full documentation for flex is maintained as a Texinfo manual. If the info and flex programs are properly installed at your site, the
command
info flex
should give you access to the complete manual.
flex 2.5.35 February 2008 FLEX(1)