1FLEX(1)                           Programming                          FLEX(1)
2
3
4

NAME

6       flex - the fast lexical analyser generator
7

SYNOPSIS

9       flex [OPTIONS] [FILE]...
10

DESCRIPTION

12       Generates programs that perform pattern-matching on text.
13
14   Table Compression:
15       -Ca, --align
16              trade off larger tables for better memory alignment
17
18       -Ce, --ecs
19              construct equivalence classes
20
21       -Cf    do not compress tables; use -f representation
22
23       -CF    do not compress tables; use -F representation
24
25       -Cm, --meta-ecs
26              construct meta-equivalence classes
27
28       -Cr, --read
29              use read() instead of stdio for scanner input
30
31       -f, --full
32              generate fast, large scanner. Same as -Cfr
33
34       -F, --fast
35              use alternate table representation. Same as -CFr
36
37       -Cem   default compression (same as --ecs --meta-ecs)
38
39   Debugging:
40       -d, --debug
41              enable debug mode in scanner
42
43       -b, --backup
44              write backing-up information to lex.backup
45
46       -p, --perf-report
47              write performance report to stderr
48
49       -s, --nodefault
50              suppress default rule to ECHO unmatched text
51
52       -T, --trace
53              flex should run in trace mode
54
55       -w, --nowarn
56              do not generate warnings
57
58       -v, --verbose
59              write summary of scanner statistics to stdout
60
61       --hex  use hexadecimal numbers instead of octal in debug outputs
62

FILES

64       -o, --outfile=FILE
65              specify output filename
66
67       -S, --skel=FILE
68              specify skeleton file
69
70       -t, --stdout
71              write scanner on stdout instead of lex.yy.c
72
73       --yyclass=NAME
74              name of C++ class
75
76       --header-file=FILE
77              create a C header file in addition to the scanner
78
79       --tables-file[=FILE] write tables to FILE
80
81   Scanner behavior:
82       -7, --7bit
83              generate 7-bit scanner
84
85       -8, --8bit
86              generate 8-bit scanner
87
88       -B, --batch
89              generate batch scanner (opposite of -I)
90
91       -i, --case-insensitive
92              ignore case in patterns
93
94       -l, --lex-compat
95              maximal compatibility with original lex
96
97       -X, --posix-compat
98              maximal compatibility with POSIX lex
99
100       -I, --interactive
101              generate interactive scanner (opposite of -B)
102
103       --yylineno
104              track line count in yylineno
105
106   Generated code:
107       -+,  --c++
108              generate C++ scanner class
109
110       -Dmacro[=defn]
111              #define macro defn  (default defn is '1')
112
113       -L,  --noline
114              suppress #line directives in scanner
115
116       -P,  --prefix=STRING
117              use STRING as prefix instead of "yy"
118
119       -R,  --reentrant
120              generate a reentrant C scanner
121
122       --bison-bridge
123              scanner for bison pure parser.
124
125       --bison-locations
126              include yylloc support.
127
128       --stdinit
129              initialize yyin/yyout to stdin/stdout
130
131       --nounistd
132              do not include <unistd.h>
133
134       --noFUNCTION
135              do not generate a particular FUNCTION
136
137   Miscellaneous:
138       -c     do-nothing POSIX option
139
140       -n     do-nothing POSIX option
141
142       -?
143
144       -h, --help
145              produce this help message
146
147       -V, --version
148              report flex version
149

SEE ALSO

151       The  full documentation for flex is maintained as a Texinfo manual.  If
152       the info and flex programs are properly installed  at  your  site,  the
153       command
154
155              info flex
156
157       should give you access to the complete manual.
158
159
160
161The Flex Project                   July 2019                           FLEX(1)
Impressum