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freebsd-src/usr.bin/lex/main.c
Geoff Rehmet 8387c24d79 Flex version 2.4.7 from LBL 
Reviewed by:	Geoff.
1994-08-24 13:10:34 +00:00

990 lines
24 KiB
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/* flex - tool to generate fast lexical analyzers */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Vern Paxson.
*
* The United States Government has rights in this work pursuant
* to contract no. DE-AC03-76SF00098 between the United States
* Department of Energy and the University of California.
*
* Redistribution and use in source and binary forms are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* Neither the name of the University nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
/* $Header: main.c,v 1.2 94/01/04 14:33:11 vern Exp $ */
#include "flexdef.h"
#include "version.h"
static char flex_version[] = FLEX_VERSION;
/* declare functions that have forward references */
void flexinit PROTO((int, char**));
void readin PROTO((void));
void set_up_initial_allocations PROTO((void));
/* these globals are all defined and commented in flexdef.h */
int printstats, syntaxerror, eofseen, ddebug, trace, nowarn, spprdflt;
int interactive, caseins, lex_compat, useecs, fulltbl, usemecs;
int fullspd, gen_line_dirs, performance_report, backing_up_report;
int C_plus_plus, long_align, use_read, yytext_is_array, csize;
int yymore_used, reject, real_reject, continued_action;
int yymore_really_used, reject_really_used;
int datapos, dataline, linenum;
FILE *skelfile = NULL;
int skel_ind = 0;
char *action_array;
int action_size, defs1_offset, prolog_offset, action_offset, action_index;
char *infilename = NULL;
int onestate[ONE_STACK_SIZE], onesym[ONE_STACK_SIZE];
int onenext[ONE_STACK_SIZE], onedef[ONE_STACK_SIZE], onesp;
int current_mns, num_rules, num_eof_rules, default_rule;
int current_max_rules, lastnfa;
int *firstst, *lastst, *finalst, *transchar, *trans1, *trans2;
int *accptnum, *assoc_rule, *state_type;
int *rule_type, *rule_linenum, *rule_useful;
int current_state_type;
int variable_trailing_context_rules;
int numtemps, numprots, protprev[MSP], protnext[MSP], prottbl[MSP];
int protcomst[MSP], firstprot, lastprot, protsave[PROT_SAVE_SIZE];
int numecs, nextecm[CSIZE + 1], ecgroup[CSIZE + 1], nummecs, tecfwd[CSIZE + 1];
int tecbck[CSIZE + 1];
int lastsc, current_max_scs, *scset, *scbol, *scxclu, *sceof, *actvsc;
char **scname;
int current_max_dfa_size, current_max_xpairs;
int current_max_template_xpairs, current_max_dfas;
int lastdfa, *nxt, *chk, *tnxt;
int *base, *def, *nultrans, NUL_ec, tblend, firstfree, **dss, *dfasiz;
union dfaacc_union *dfaacc;
int *accsiz, *dhash, numas;
int numsnpairs, jambase, jamstate;
int lastccl, current_maxccls, *cclmap, *ccllen, *cclng, cclreuse;
int current_max_ccl_tbl_size;
Char *ccltbl;
char nmstr[MAXLINE];
int sectnum, nummt, hshcol, dfaeql, numeps, eps2, num_reallocs;
int tmpuses, totnst, peakpairs, numuniq, numdup, hshsave;
int num_backing_up, bol_needed;
FILE *backing_up_file;
int end_of_buffer_state;
char **input_files;
int num_input_files;
char *program_name;
#ifndef SHORT_FILE_NAMES
static char *outfile_template = "lex.%s.%s";
#else
static char *outfile_template = "lex%s.%s";
#endif
static char outfile_path[64];
static int outfile_created = 0;
static int use_stdout;
static char *skelname = NULL;
static char *prefix = "yy";
int main( argc, argv )
int argc;
char **argv;
{
int i;
flexinit( argc, argv );
readin();
ntod();
for ( i = 1; i <= num_rules; ++i )
if ( ! rule_useful[i] && i != default_rule )
line_warning( "rule cannot be matched",
rule_linenum[i] );
if ( spprdflt && ! reject && rule_useful[default_rule] )
line_warning( "-s option given but default rule can be matched",
rule_linenum[default_rule] );
/* Generate the C state transition tables from the DFA. */
make_tables();
/* Note, flexend does not return. It exits with its argument
* as status.
*/
flexend( 0 );
return 0; /* keep compilers/lint happy */
}
/* flexend - terminate flex
*
* note
* This routine does not return.
*/
void flexend( exit_status )
int exit_status;
{
int tblsiz;
int unlink();
if ( skelfile != NULL )
{
if ( ferror( skelfile ) )
flexfatal(
"error occurred when reading skeleton file" );
else if ( fclose( skelfile ) )
flexfatal(
"error occurred when closing skeleton file" );
}
if ( exit_status != 0 && outfile_created )
{
if ( ferror( stdout ) )
flexfatal( "error occurred when writing output file" );
else if ( fclose( stdout ) )
flexfatal( "error occurred when closing output file" );
else if ( unlink( outfile_path ) )
flexfatal( "error occurred when deleting output file" );
}
if ( backing_up_report && backing_up_file )
{
if ( num_backing_up == 0 )
fprintf( backing_up_file, "No backing up.\n" );
else if ( fullspd || fulltbl )
fprintf( backing_up_file,
"%d backing up (non-accepting) states.\n",
num_backing_up );
else
fprintf( backing_up_file,
"Compressed tables always back up.\n" );
if ( ferror( backing_up_file ) )
flexfatal( "error occurred when writing backup file" );
else if ( fclose( backing_up_file ) )
flexfatal( "error occurred when closing backup file" );
}
if ( printstats )
{
fprintf( stderr, "%s version %s usage statistics:\n",
program_name, flex_version );
fprintf( stderr, " scanner options: -" );
if ( C_plus_plus )
putc( '+', stderr );
if ( backing_up_report )
putc( 'b', stderr );
if ( ddebug )
putc( 'd', stderr );
if ( caseins )
putc( 'i', stderr );
if ( lex_compat )
putc( 'l', stderr );
if ( performance_report > 0 )
putc( 'p', stderr );
if ( performance_report > 1 )
putc( 'p', stderr );
if ( spprdflt )
putc( 's', stderr );
if ( use_stdout )
putc( 't', stderr );
if ( printstats )
putc( 'v', stderr ); /* always true! */
if ( nowarn )
putc( 'w', stderr );
if ( ! interactive )
putc( 'B', stderr );
if ( interactive )
putc( 'I', stderr );
if ( ! gen_line_dirs )
putc( 'L', stderr );
if ( trace )
putc( 'T', stderr );
if ( csize == 128 )
putc( '7', stderr );
else
putc( '8', stderr );
fprintf( stderr, " -C" );
if ( long_align )
putc( 'a', stderr );
if ( fulltbl )
putc( 'f', stderr );
if ( fullspd )
putc( 'F', stderr );
if ( useecs )
putc( 'e', stderr );
if ( usemecs )
putc( 'm', stderr );
if ( use_read )
putc( 'r', stderr );
if ( skelname )
fprintf( stderr, " -S%s", skelname );
if ( strcmp( prefix, "yy" ) )
fprintf( stderr, " -P%s", prefix );
putc( '\n', stderr );
fprintf( stderr, " %d/%d NFA states\n", lastnfa, current_mns );
fprintf( stderr, " %d/%d DFA states (%d words)\n", lastdfa,
current_max_dfas, totnst );
fprintf( stderr, " %d rules\n",
num_rules + num_eof_rules - 1 /* - 1 for def. rule */ );
if ( num_backing_up == 0 )
fprintf( stderr, " No backing up\n" );
else if ( fullspd || fulltbl )
fprintf( stderr,
" %d backing-up (non-accepting) states\n",
num_backing_up );
else
fprintf( stderr,
" Compressed tables always back-up\n" );
if ( bol_needed )
fprintf( stderr,
" Beginning-of-line patterns used\n" );
fprintf( stderr, " %d/%d start conditions\n", lastsc,
current_max_scs );
fprintf( stderr,
" %d epsilon states, %d double epsilon states\n",
numeps, eps2 );
if ( lastccl == 0 )
fprintf( stderr, " no character classes\n" );
else
fprintf( stderr,
" %d/%d character classes needed %d/%d words of storage, %d reused\n",
lastccl, current_maxccls,
cclmap[lastccl] + ccllen[lastccl],
current_max_ccl_tbl_size, cclreuse );
fprintf( stderr, " %d state/nextstate pairs created\n",
numsnpairs );
fprintf( stderr, " %d/%d unique/duplicate transitions\n",
numuniq, numdup );
if ( fulltbl )
{
tblsiz = lastdfa * numecs;
fprintf( stderr, " %d table entries\n", tblsiz );
}
else
{
tblsiz = 2 * (lastdfa + numtemps) + 2 * tblend;
fprintf( stderr, " %d/%d base-def entries created\n",
lastdfa + numtemps, current_max_dfas );
fprintf( stderr,
" %d/%d (peak %d) nxt-chk entries created\n",
tblend, current_max_xpairs, peakpairs );
fprintf( stderr,
" %d/%d (peak %d) template nxt-chk entries created\n",
numtemps * nummecs, current_max_template_xpairs,
numtemps * numecs );
fprintf( stderr, " %d empty table entries\n", nummt );
fprintf( stderr, " %d protos created\n", numprots );
fprintf( stderr, " %d templates created, %d uses\n",
numtemps, tmpuses );
}
if ( useecs )
{
tblsiz = tblsiz + csize;
fprintf( stderr,
" %d/%d equivalence classes created\n",
numecs, csize );
}
if ( usemecs )
{
tblsiz = tblsiz + numecs;
fprintf( stderr,
" %d/%d meta-equivalence classes created\n",
nummecs, csize );
}
fprintf( stderr,
" %d (%d saved) hash collisions, %d DFAs equal\n",
hshcol, hshsave, dfaeql );
fprintf( stderr, " %d sets of reallocations needed\n",
num_reallocs );
fprintf( stderr, " %d total table entries needed\n", tblsiz );
}
#ifndef VMS
exit( exit_status );
#else
exit( exit_status + 1 );
#endif
}
/* flexinit - initialize flex */
void flexinit( argc, argv )
int argc;
char **argv;
{
int i, sawcmpflag;
int csize_given, interactive_given;
char *arg, *mktemp();
printstats = syntaxerror = trace = spprdflt = caseins = false;
lex_compat = false;
C_plus_plus = backing_up_report = ddebug = fulltbl = fullspd = false;
long_align = nowarn = yymore_used = continued_action = reject = false;
yytext_is_array = yymore_really_used = reject_really_used = false;
gen_line_dirs = usemecs = useecs = true;
performance_report = 0;
sawcmpflag = false;
use_read = use_stdout = false;
csize_given = false;
interactive_given = false;
/* Initialize dynamic array for holding the rule actions. */
action_size = 2048; /* default size of action array in bytes */
action_array = allocate_character_array( action_size );
defs1_offset = prolog_offset = action_offset = action_index = 0;
action_array[0] = '\0';
program_name = argv[0];
if ( program_name[0] != '\0' &&
program_name[strlen( program_name ) - 1] == '+' )
C_plus_plus = true;
/* read flags */
for ( --argc, ++argv; argc ; --argc, ++argv )
{
if ( argv[0][0] != '-' || argv[0][1] == '\0' )
break;
arg = argv[0];
for ( i = 1; arg[i] != '\0'; ++i )
switch ( arg[i] )
{
case '+':
C_plus_plus = true;
break;
case 'B':
interactive = false;
interactive_given = true;
break;
case 'b':
backing_up_report = true;
break;
case 'c':
fprintf( stderr,
"%s: Assuming use of deprecated -c flag is really intended to be -C\n",
program_name );
/* fall through */
case 'C':
if ( i != 1 )
flexerror(
"-C flag must be given separately" );
if ( ! sawcmpflag )
{
useecs = false;
usemecs = false;
fulltbl = false;
sawcmpflag = true;
}
for ( ++i; arg[i] != '\0'; ++i )
switch ( arg[i] )
{
case 'a':
long_align =
true;
break;
case 'e':
useecs = true;
break;
case 'F':
fullspd = true;
break;
case 'f':
fulltbl = true;
break;
case 'm':
usemecs = true;
break;
case 'r':
use_read = true;
break;
default:
lerrif(
"unknown -C option '%c'",
(int) arg[i] );
break;
}
goto get_next_arg;
case 'd':
ddebug = true;
break;
case 'f':
useecs = usemecs = false;
use_read = fulltbl = true;
break;
case 'F':
useecs = usemecs = false;
use_read = fullspd = true;
break;
case 'h':
usage();
exit( 0 );
case 'I':
interactive = true;
interactive_given = true;
break;
case 'i':
caseins = true;
break;
case 'l':
lex_compat = true;
break;
case 'L':
gen_line_dirs = false;
break;
case 'n':
/* Stupid do-nothing deprecated
* option.
*/
break;
case 'P':
if ( i != 1 )
flexerror(
"-P flag must be given separately" );
prefix = arg + i + 1;
goto get_next_arg;
case 'p':
++performance_report;
break;
case 'S':
if ( i != 1 )
flexerror(
"-S flag must be given separately" );
skelname = arg + i + 1;
goto get_next_arg;
case 's':
spprdflt = true;
break;
case 't':
use_stdout = true;
break;
case 'T':
trace = true;
break;
case 'v':
printstats = true;
break;
case 'V':
fprintf( stderr, "%s version %s\n",
program_name, flex_version );
exit( 0 );
case 'w':
nowarn = true;
break;
case '7':
csize = 128;
csize_given = true;
break;
case '8':
csize = CSIZE;
csize_given = true;
break;
default:
fprintf( stderr,
"%s: unknown flag '%c'\n",
program_name, (int) arg[i] );
usage();
exit( 1 );
}
/* Used by -C, -S and -P flags in lieu of a "continue 2"
* control.
*/
get_next_arg: ;
}
if ( ! csize_given )
{
if ( (fulltbl || fullspd) && ! useecs )
csize = DEFAULT_CSIZE;
else
csize = CSIZE;
}
if ( ! interactive_given )
{
if ( fulltbl || fullspd )
interactive = false;
else
interactive = true;
}
if ( lex_compat )
{
if ( C_plus_plus )
flexerror( "Can't use -+ with -l option" );
if ( fulltbl || fullspd )
flexerror( "Can't use -f or -F with -l option" );
/* Don't rely on detecting use of yymore() and REJECT,
* just assume they'll be used.
*/
yymore_really_used = reject_really_used = true;
yytext_is_array = true;
use_read = false;
}
if ( (fulltbl || fullspd) && usemecs )
flexerror( "-Cf/-CF and -Cm don't make sense together" );
if ( (fulltbl || fullspd) && interactive )
flexerror( "-Cf/-CF and -I are incompatible" );
if ( fulltbl && fullspd )
flexerror( "-Cf and -CF are mutually exclusive" );
if ( C_plus_plus && fullspd )
flexerror( "Can't use -+ with -CF option" );
if ( ! use_stdout )
{
FILE *prev_stdout;
char *suffix;
if ( C_plus_plus )
suffix = "cc";
else
suffix = "c";
sprintf( outfile_path, outfile_template, prefix, suffix );
prev_stdout = freopen( outfile_path, "w", stdout );
if ( prev_stdout == NULL )
lerrsf( "could not create %s", outfile_path );
outfile_created = 1;
}
num_input_files = argc;
input_files = argv;
set_input_file( num_input_files > 0 ? input_files[0] : NULL );
if ( backing_up_report )
{
#ifndef SHORT_FILE_NAMES
backing_up_file = fopen( "lex.backup", "w" );
#else
backing_up_file = fopen( "lex.bck", "w" );
#endif
if ( backing_up_file == NULL )
flexerror( "could not create lex.backup" );
}
else
backing_up_file = NULL;
lastccl = 0;
lastsc = 0;
if ( skelname && (skelfile = fopen( skelname, "r" )) == NULL )
lerrsf( "can't open skeleton file %s", skelname );
if ( strcmp( prefix, "yy" ) )
{
#define GEN_PREFIX(name) printf( "#define yy%s %s%s\n", name, prefix, name );
GEN_PREFIX( "FlexLexer" );
GEN_PREFIX( "_create_buffer" );
GEN_PREFIX( "_delete_buffer" );
GEN_PREFIX( "_flex_debug" );
GEN_PREFIX( "_init_buffer" );
GEN_PREFIX( "_load_buffer_state" );
GEN_PREFIX( "_switch_to_buffer" );
GEN_PREFIX( "in" );
GEN_PREFIX( "leng" );
GEN_PREFIX( "lex" );
GEN_PREFIX( "out" );
GEN_PREFIX( "restart" );
GEN_PREFIX( "text" );
GEN_PREFIX( "wrap" );
printf( "\n" );
}
lastdfa = lastnfa = 0;
num_rules = num_eof_rules = default_rule = 0;
numas = numsnpairs = tmpuses = 0;
numecs = numeps = eps2 = num_reallocs = hshcol = dfaeql = totnst = 0;
numuniq = numdup = hshsave = eofseen = datapos = dataline = 0;
num_backing_up = onesp = numprots = 0;
variable_trailing_context_rules = bol_needed = false;
linenum = sectnum = 1;
firstprot = NIL;
/* Used in mkprot() so that the first proto goes in slot 1
* of the proto queue.
*/
lastprot = 1;
if ( useecs )
{
/* Set up doubly-linked equivalence classes. */
/* We loop all the way up to csize, since ecgroup[csize] is
* the position used for NUL characters.
*/
ecgroup[1] = NIL;
for ( i = 2; i <= csize; ++i )
{
ecgroup[i] = i - 1;
nextecm[i - 1] = i;
}
nextecm[csize] = NIL;
}
else
{
/* Put everything in its own equivalence class. */
for ( i = 1; i <= csize; ++i )
{
ecgroup[i] = i;
nextecm[i] = BAD_SUBSCRIPT; /* to catch errors */
}
}
set_up_initial_allocations();
}
/* readin - read in the rules section of the input file(s) */
void readin()
{
skelout();
line_directive_out( (FILE *) 0 );
if ( yyparse() )
{
pinpoint_message( "fatal parse error" );
flexend( 1 );
}
if ( syntaxerror )
flexend( 1 );
if ( yymore_really_used == REALLY_USED )
yymore_used = true;
else if ( yymore_really_used == REALLY_NOT_USED )
yymore_used = false;
if ( reject_really_used == REALLY_USED )
reject = true;
else if ( reject_really_used == REALLY_NOT_USED )
reject = false;
if ( performance_report > 0 )
{
if ( lex_compat )
{
fprintf( stderr,
"-l AT&T lex compatibility option entails a large performance penalty\n" );
fprintf( stderr,
" and may be the actual source of other reported performance penalties\n" );
}
if ( performance_report > 1 )
{
if ( interactive )
fprintf( stderr,
"-I (interactive) entails a minor performance penalty\n" );
if ( yymore_used )
fprintf( stderr,
"yymore() entails a minor performance penalty\n" );
}
if ( reject )
fprintf( stderr,
"REJECT entails a large performance penalty\n" );
if ( variable_trailing_context_rules )
fprintf( stderr,
"Variable trailing context rules entail a large performance penalty\n" );
}
if ( reject )
real_reject = true;
if ( variable_trailing_context_rules )
reject = true;
if ( (fulltbl || fullspd) && reject )
{
if ( real_reject )
flexerror( "REJECT cannot be used with -f or -F" );
else
flexerror(
"variable trailing context rules cannot be used with -f or -F" );
}
if ( csize == 256 )
puts( "typedef unsigned char YY_CHAR;" );
else
puts( "typedef char YY_CHAR;" );
if ( C_plus_plus )
{
puts( "#define yytext_ptr yytext" );
if ( interactive )
puts( "#define YY_INTERACTIVE" );
}
if ( fullspd )
printf(
"typedef const struct yy_trans_info *yy_state_type;\n" );
else if ( ! C_plus_plus )
printf( "typedef int yy_state_type;\n" );
if ( reject )
printf( "\n#define YY_USES_REJECT\n" );
if ( ddebug )
puts( "\n#define FLEX_DEBUG" );
if ( lex_compat )
{
printf( "FILE *yyin = stdin, *yyout = stdout;\n" );
printf( "extern int yylineno;\n" );
printf( "int yylineno = 1;\n" );
}
else if ( ! C_plus_plus )
printf( "FILE *yyin = (FILE *) 0, *yyout = (FILE *) 0;\n" );
if ( C_plus_plus )
printf( "\n#include <FlexLexer.h>\n" );
else
{
if ( yytext_is_array )
puts( "extern char yytext[];\n" );
else
{
puts( "extern char *yytext;" );
puts( "#define yytext_ptr yytext" );
}
}
if ( useecs )
numecs = cre8ecs( nextecm, ecgroup, csize );
else
numecs = csize;
/* Now map the equivalence class for NUL to its expected place. */
ecgroup[0] = ecgroup[csize];
NUL_ec = ABS( ecgroup[0] );
if ( useecs )
ccl2ecl();
}
/* set_up_initial_allocations - allocate memory for internal tables */
void set_up_initial_allocations()
{
current_mns = INITIAL_MNS;
firstst = allocate_integer_array( current_mns );
lastst = allocate_integer_array( current_mns );
finalst = allocate_integer_array( current_mns );
transchar = allocate_integer_array( current_mns );
trans1 = allocate_integer_array( current_mns );
trans2 = allocate_integer_array( current_mns );
accptnum = allocate_integer_array( current_mns );
assoc_rule = allocate_integer_array( current_mns );
state_type = allocate_integer_array( current_mns );
current_max_rules = INITIAL_MAX_RULES;
rule_type = allocate_integer_array( current_max_rules );
rule_linenum = allocate_integer_array( current_max_rules );
rule_useful = allocate_integer_array( current_max_rules );
current_max_scs = INITIAL_MAX_SCS;
scset = allocate_integer_array( current_max_scs );
scbol = allocate_integer_array( current_max_scs );
scxclu = allocate_integer_array( current_max_scs );
sceof = allocate_integer_array( current_max_scs );
scname = allocate_char_ptr_array( current_max_scs );
actvsc = allocate_integer_array( current_max_scs );
current_maxccls = INITIAL_MAX_CCLS;
cclmap = allocate_integer_array( current_maxccls );
ccllen = allocate_integer_array( current_maxccls );
cclng = allocate_integer_array( current_maxccls );
current_max_ccl_tbl_size = INITIAL_MAX_CCL_TBL_SIZE;
ccltbl = allocate_Character_array( current_max_ccl_tbl_size );
current_max_dfa_size = INITIAL_MAX_DFA_SIZE;
current_max_xpairs = INITIAL_MAX_XPAIRS;
nxt = allocate_integer_array( current_max_xpairs );
chk = allocate_integer_array( current_max_xpairs );
current_max_template_xpairs = INITIAL_MAX_TEMPLATE_XPAIRS;
tnxt = allocate_integer_array( current_max_template_xpairs );
current_max_dfas = INITIAL_MAX_DFAS;
base = allocate_integer_array( current_max_dfas );
def = allocate_integer_array( current_max_dfas );
dfasiz = allocate_integer_array( current_max_dfas );
accsiz = allocate_integer_array( current_max_dfas );
dhash = allocate_integer_array( current_max_dfas );
dss = allocate_int_ptr_array( current_max_dfas );
dfaacc = allocate_dfaacc_union( current_max_dfas );
nultrans = (int *) 0;
}
void usage()
{
fprintf( stderr,
"%s [-bcdfhilnpstvwBFILTV78+ -C[aefFmr] -Pprefix -Sskeleton] [file ...]\n",
program_name );
fprintf( stderr,
"\t-b generate backing-up information to lex.backup\n" );
fprintf( stderr, "\t-c do-nothing POSIX option\n" );
fprintf( stderr, "\t-d turn on debug mode in generated scanner\n" );
fprintf( stderr, "\t-f generate fast, large scanner\n" );
fprintf( stderr, "\t-h produce this help message\n" );
fprintf( stderr, "\t-i generate case-insensitive scanner\n" );
fprintf( stderr, "\t-l maximal compatibility with original lex\n" );
fprintf( stderr, "\t-n do-nothing POSIX option\n" );
fprintf( stderr, "\t-p generate performance report to stderr\n" );
fprintf( stderr,
"\t-s suppress default rule to ECHO unmatched text\n" );
fprintf( stderr,
"\t-t write generated scanner on stdout instead of lex.yy.c\n" );
fprintf( stderr,
"\t-v write summary of scanner statistics to stderr\n" );
fprintf( stderr, "\t-w do not generate warnings\n" );
fprintf( stderr, "\t-B generate batch scanner (opposite of -I)\n" );
fprintf( stderr,
"\t-F use alternative fast scanner representation\n" );
fprintf( stderr,
"\t-I generate interactive scanner (opposite of -B)\n" );
fprintf( stderr, "\t-L suppress #line directives in scanner\n" );
fprintf( stderr, "\t-T %s should run in trace mode\n", program_name );
fprintf( stderr, "\t-V report %s version\n", program_name );
fprintf( stderr, "\t-7 generate 7-bit scanner\n" );
fprintf( stderr, "\t-8 generate 8-bit scanner\n" );
fprintf( stderr, "\t-+ generate C++ scanner class\n" );
fprintf( stderr,
"\t-C specify degree of table compression (default is -Cem):\n" );
fprintf( stderr,
"\t\t-Ca trade off larger tables for better memory alignment\n" );
fprintf( stderr, "\t\t-Ce construct equivalence classes\n" );
fprintf( stderr,
"\t\t-Cf do not compress scanner tables; use -f representation\n" );
fprintf( stderr,
"\t\t-CF do not compress scanner tables; use -F representation\n" );
fprintf( stderr, "\t\t-Cm construct meta-equivalence classes\n" );
fprintf( stderr,
"\t\t-Cr use read() instead of stdio for scanner input\n" );
fprintf( stderr, "\t-P specify scanner prefix other than \"yy\"\n" );
fprintf( stderr, "\t-S specify skeleton file\n" );
}
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