FLEX - Online Linux Manual PageSection : 1
Updated : June 2020
Source : The Flex Project
Note : Programming
NAMEflex − the fast lexical analyser generator
SYNOPSISflex [OPTIONS] [FILE]...
DESCRIPTIONGenerates 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 −−hex use hexadecimal numbers instead of octal in debug outputs
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 −−backup−file=FILE write backing−up information 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 −−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 ALSOThe 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. 0
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