flex (1) Linux Manual Page

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.

Index