summaryrefslogtreecommitdiff
path: root/Master/tlpkg/tlperl/lib/File/DosGlob.pm
blob: a1c27d5c32a2842b7fe7e98a804d259ba9d1d0b1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
#!perl -w

# use strict fails
#Can't use string ("main::glob") as a symbol ref while "strict refs" in use at /usr/lib/perl5/5.005/File/DosGlob.pm line 191.

#
# Documentation at the __END__
#

package File::DosGlob;

our $VERSION = '1.00';
use strict;
use warnings;

sub doglob {
    my $cond = shift;
    my @retval = ();
    #print "doglob: ", join('|', @_), "\n";
  OUTER:
    for my $pat (@_) {
	my @matched = ();
	my @globdirs = ();
	my $head = '.';
	my $sepchr = '/';
        my $tail;
	next OUTER unless defined $pat and $pat ne '';
	# if arg is within quotes strip em and do no globbing
	if ($pat =~ /^"(.*)"\z/s) {
	    $pat = $1;
	    if ($cond eq 'd') { push(@retval, $pat) if -d $pat }
	    else              { push(@retval, $pat) if -e $pat }
	    next OUTER;
	}
	# wildcards with a drive prefix such as h:*.pm must be changed
	# to h:./*.pm to expand correctly
	if ($pat =~ m|^([A-Za-z]:)[^/\\]|s) {
	    substr($_,0,2) = $1 . "./";
	}
	if ($pat =~ m|^(.*)([\\/])([^\\/]*)\z|s) {
	    ($head, $sepchr, $tail) = ($1,$2,$3);
	    #print "div: |$head|$sepchr|$tail|\n";
	    push (@retval, $pat), next OUTER if $tail eq '';
	    if ($head =~ /[*?]/) {
		@globdirs = doglob('d', $head);
		push(@retval, doglob($cond, map {"$_$sepchr$tail"} @globdirs)),
		    next OUTER if @globdirs;
	    }
	    $head .= $sepchr if $head eq '' or $head =~ /^[A-Za-z]:\z/s;
	    $pat = $tail;
	}
	#
	# If file component has no wildcards, we can avoid opendir
	unless ($pat =~ /[*?]/) {
	    $head = '' if $head eq '.';
	    $head .= $sepchr unless $head eq '' or substr($head,-1) eq $sepchr;
	    $head .= $pat;
	    if ($cond eq 'd') { push(@retval,$head) if -d $head }
	    else              { push(@retval,$head) if -e $head }
	    next OUTER;
	}
	opendir(D, $head) or next OUTER;
	my @leaves = readdir D;
	closedir D;
	$head = '' if $head eq '.';
	$head .= $sepchr unless $head eq '' or substr($head,-1) eq $sepchr;

	# escape regex metachars but not glob chars
        $pat =~ s:([].+^\-\${}[|]):\\$1:g;
	# and convert DOS-style wildcards to regex
	$pat =~ s/\*/.*/g;
	$pat =~ s/\?/.?/g;

	#print "regex: '$pat', head: '$head'\n";
	my $matchsub = sub { $_[0] =~ m|^$pat\z|is };
      INNER:
	for my $e (@leaves) {
	    next INNER if $e eq '.' or $e eq '..';
	    next INNER if $cond eq 'd' and ! -d "$head$e";
	    push(@matched, "$head$e"), next INNER if &$matchsub($e);
	    #
	    # [DOS compatibility special case]
	    # Failed, add a trailing dot and try again, but only
	    # if name does not have a dot in it *and* pattern
	    # has a dot *and* name is shorter than 9 chars.
	    #
	    if (index($e,'.') == -1 and length($e) < 9
	        and index($pat,'\\.') != -1) {
		push(@matched, "$head$e"), next INNER if &$matchsub("$e.");
	    }
	}
	push @retval, @matched if @matched;
    }
    return @retval;
}


#
# Do DOS-like globbing on Mac OS 
#
sub doglob_Mac {
    my $cond = shift;
    my @retval = ();

	#print "doglob_Mac: ", join('|', @_), "\n";
  OUTER:
    for my $arg (@_) {
        local $_ = $arg;
	my @matched = ();
	my @globdirs = ();
	my $head = ':';
	my $not_esc_head = $head;
	my $sepchr = ':';	
	next OUTER unless defined $_ and $_ ne '';
	# if arg is within quotes strip em and do no globbing
	if (/^"(.*)"\z/s) {
	    $_ = $1;
		# $_ may contain escaped metachars '\*', '\?' and '\'
	        my $not_esc_arg = $_;
		$not_esc_arg =~ s/\\([*?\\])/$1/g;
	    if ($cond eq 'd') { push(@retval, $not_esc_arg) if -d $not_esc_arg }
	    else              { push(@retval, $not_esc_arg) if -e $not_esc_arg }
	    next OUTER;
	}

	if (m|^(.*?)(:+)([^:]*)\z|s) { # note: $1 is not greedy
	    my $tail;
	    ($head, $sepchr, $tail) = ($1,$2,$3);
	    #print "div: |$head|$sepchr|$tail|\n";
	    push (@retval, $_), next OUTER if $tail eq '';		
		#
		# $head may contain escaped metachars '\*' and '\?'
		
		my $tmp_head = $head;
		# if a '*' or '?' is preceded by an odd count of '\', temporary delete 
		# it (and its preceding backslashes), i.e. don't treat '\*' and '\?' as 
		# wildcards
		$tmp_head =~ s/(\\*)([*?])/$2 x ((length($1) + 1) % 2)/eg;
	
		if ($tmp_head =~ /[*?]/) { # if there are wildcards ...	
		@globdirs = doglob_Mac('d', $head);
		push(@retval, doglob_Mac($cond, map {"$_$sepchr$tail"} @globdirs)),
		    next OUTER if @globdirs;
	    }
		
		$head .= $sepchr; 
		$not_esc_head = $head;
		# unescape $head for file operations
		$not_esc_head =~ s/\\([*?\\])/$1/g;
	    $_ = $tail;
	}
	#
	# If file component has no wildcards, we can avoid opendir
	
	my $tmp_tail = $_;
	# if a '*' or '?' is preceded by an odd count of '\', temporary delete 
	# it (and its preceding backslashes), i.e. don't treat '\*' and '\?' as 
	# wildcards
	$tmp_tail =~ s/(\\*)([*?])/$2 x ((length($1) + 1) % 2)/eg;
	
	unless ($tmp_tail =~ /[*?]/) { # if there are wildcards ...
	    $not_esc_head = $head = '' if $head eq ':';
	    my $not_esc_tail = $_;
	    # unescape $head and $tail for file operations
	    $not_esc_tail =~ s/\\([*?\\])/$1/g;
	    $head .= $_;
		$not_esc_head .= $not_esc_tail;
	    if ($cond eq 'd') { push(@retval,$head) if -d $not_esc_head }
	    else              { push(@retval,$head) if -e $not_esc_head }
	    next OUTER;
	}
	#print "opendir($not_esc_head)\n";
	opendir(D, $not_esc_head) or next OUTER;
	my @leaves = readdir D;
	closedir D;

	# escape regex metachars but not '\' and glob chars '*', '?'
	$_ =~ s:([].+^\-\${}[|]):\\$1:g;
	# and convert DOS-style wildcards to regex,
	# but only if they are not escaped
	$_ =~ s/(\\*)([*?])/$1 . ('.' x ((length($1) + 1) % 2)) . $2/eg;

	#print "regex: '$_', head: '$head', unescaped head: '$not_esc_head'\n";
	my $matchsub = eval 'sub { $_[0] =~ m|^' . $_ . '\\z|ios }';
	warn($@), next OUTER if $@;
      INNER:
	for my $e (@leaves) {
	    next INNER if $e eq '.' or $e eq '..';
	    next INNER if $cond eq 'd' and ! -d "$not_esc_head$e";
		
		if (&$matchsub($e)) {
			my $leave = (($not_esc_head eq ':') && (-f "$not_esc_head$e")) ? 
		            	"$e" : "$not_esc_head$e";
			#
			# On Mac OS, the two glob metachars '*' and '?' and the escape 
			# char '\' are valid characters for file and directory names. 
			# We have to escape and treat them specially.
			$leave =~ s|([*?\\])|\\$1|g;		
			push(@matched, $leave);
			next INNER;
		}
	}
	push @retval, @matched if @matched;
    }
    return @retval;
}

#
# _expand_volume() will only be used on Mac OS (Classic): 
# Takes an array of original patterns as argument and returns an array of  
# possibly modified patterns. Each original pattern is processed like 
# that:
# + If there's a volume name in the pattern, we push a separate pattern 
#   for each mounted volume that matches (with '*', '?' and '\' escaped).  
# + If there's no volume name in the original pattern, it is pushed 
#   unchanged. 
# Note that the returned array of patterns may be empty.
#  
sub _expand_volume {
	
	require MacPerl; # to be verbose
	
	my @pat = @_;
	my @new_pat = ();
	my @FSSpec_Vols = MacPerl::Volumes();
	my @mounted_volumes = ();

	foreach my $spec_vol (@FSSpec_Vols) {		
		# push all mounted volumes into array
     	push @mounted_volumes, MacPerl::MakePath($spec_vol);
	}
	#print "mounted volumes: |@mounted_volumes|\n";
	
	while (@pat) {
		my $pat = shift @pat;	
		if ($pat =~ /^([^:]+:)(.*)\z/) { # match a volume name?
			my $vol_pat = $1;
			my $tail = $2;
			#
			# escape regex metachars but not '\' and glob chars '*', '?'
			$vol_pat =~ s:([].+^\-\${}[|]):\\$1:g;
			# and convert DOS-style wildcards to regex,
			# but only if they are not escaped
			$vol_pat =~ s/(\\*)([*?])/$1 . ('.' x ((length($1) + 1) % 2)) . $2/eg;
			#print "volume regex: '$vol_pat' \n";
				
			foreach my $volume (@mounted_volumes) {
				if ($volume =~ m|^$vol_pat\z|ios) {
					#
					# On Mac OS, the two glob metachars '*' and '?' and the  
					# escape char '\' are valid characters for volume names. 
					# We have to escape and treat them specially.
					$volume =~ s|([*?\\])|\\$1|g;
					push @new_pat, $volume . $tail;
				}
			}			
		} else { # no volume name in pattern, push original pattern
			push @new_pat, $pat;
		}
	}
	return @new_pat;
}


#
# _preprocess_pattern() will only be used on Mac OS (Classic): 
# Resolves any updirs in the pattern. Removes a single trailing colon 
# from the pattern, unless it's a volume name pattern like "*HD:"
#
sub _preprocess_pattern {
	my @pat = @_;
	
	foreach my $p (@pat) {
		my $proceed;
		# resolve any updirs, e.g. "*HD:t?p::a*" -> "*HD:a*"
		do {
			$proceed = ($p =~ s/^(.*):[^:]+::(.*?)\z/$1:$2/);  
		} while ($proceed);
		# remove a single trailing colon, e.g. ":*:" -> ":*"
		$p =~ s/:([^:]+):\z/:$1/;
	}
	return @pat;
}
		
		
#
# _un_escape() will only be used on Mac OS (Classic):
# Unescapes a list of arguments which may contain escaped 
# metachars '*', '?' and '\'.
#
sub _un_escape {
	foreach (@_) {
		s/\\([*?\\])/$1/g;
	}
	return @_;
}

#
# this can be used to override CORE::glob in a specific
# package by saying C<use File::DosGlob 'glob';> in that
# namespace.
#

# context (keyed by second cxix arg provided by core)
my %iter;
my %entries;

sub glob {
    my($pat,$cxix) = @_;
    my @pat;

    # glob without args defaults to $_
    $pat = $_ unless defined $pat;

    # extract patterns
    if ($pat =~ /\s/) {
	require Text::ParseWords;
	@pat = Text::ParseWords::parse_line('\s+',0,$pat);
    }
    else {
	push @pat, $pat;
    }

    # Mike Mestnik: made to do abc{1,2,3} == abc1 abc2 abc3.
    #   abc3 will be the original {3} (and drop the {}).
    #   abc1 abc2 will be put in @appendpat.
    # This was just the esiest way, not nearly the best.
    REHASH: {
	my @appendpat = ();
	for (@pat) {
	    # There must be a "," I.E. abc{efg} is not what we want.
	    while ( /^(.*)(?<!\\)\{(.*?)(?<!\\)\,.*?(?<!\\)\}(.*)$/ ) {
		my ($start, $match, $end) = ($1, $2, $3);
		#print "Got: \n\t$start\n\t$match\n\t$end\n";
		my $tmp = "$start$match$end";
		while ( $tmp =~ s/^(.*?)(?<!\\)\{(?:.*(?<!\\)\,)?(.*\Q$match\E.*?)(?:(?<!\\)\,.*)?(?<!\\)\}(.*)$/$1$2$3/ ) {
		    #print "Striped: $tmp\n";
		    #  these expanshions will be preformed by the original,
		    #  when we call REHASH.
		}
		push @appendpat, ("$tmp");
		s/^\Q$start\E(?<!\\)\{\Q$match\E(?<!\\)\,/$start\{/;
		if ( /^\Q$start\E(?<!\\)\{(?!.*?(?<!\\)\,.*?\Q$end\E$)(.*)(?<!\\)\}\Q$end\E$/ ) {
		    $match = $1;
		    #print "GOT: \n\t$start\n\t$match\n\t$end\n\n";
		    $_ = "$start$match$end";
		}
	    }
	    #print "Sould have "GOT" vs "Got"!\n";
		#FIXME: There should be checking for this.
		#  How or what should be done about failure is beond me.
	}
	if ( $#appendpat != -1
		) {
	    #print "LOOP\n";
	    #FIXME: Max loop, no way! :")
	    for ( @appendpat ) {
	        push @pat, $_;
	    }
	    goto REHASH;
	}
    }
    for ( @pat ) {
	s/\\{/{/g;
	s/\\}/}/g;
	s/\\,/,/g;
    }
    #print join ("\n", @pat). "\n";
 
    # assume global context if not provided one
    $cxix = '_G_' unless defined $cxix;
    $iter{$cxix} = 0 unless exists $iter{$cxix};

    # if we're just beginning, do it all first
    if ($iter{$cxix} == 0) {
	if ($^O eq 'MacOS') {
		# first, take care of updirs and trailing colons
		@pat = _preprocess_pattern(@pat);
		# expand volume names
		@pat = _expand_volume(@pat);
		$entries{$cxix} = (@pat) ? [_un_escape( doglob_Mac(1,@pat) )] : [()];
	} else {
		$entries{$cxix} = [doglob(1,@pat)];
    }
	}

    # chuck it all out, quick or slow
    if (wantarray) {
	delete $iter{$cxix};
	return @{delete $entries{$cxix}};
    }
    else {
	if ($iter{$cxix} = scalar @{$entries{$cxix}}) {
	    return shift @{$entries{$cxix}};
	}
	else {
	    # return undef for EOL
	    delete $iter{$cxix};
	    delete $entries{$cxix};
	    return undef;
	}
    }
}

{
    no strict 'refs';

    sub import {
    my $pkg = shift;
    return unless @_;
    my $sym = shift;
    my $callpkg = ($sym =~ s/^GLOBAL_//s ? 'CORE::GLOBAL' : caller(0));
    *{$callpkg.'::'.$sym} = \&{$pkg.'::'.$sym} if $sym eq 'glob';
    }
}
1;

__END__

=head1 NAME

File::DosGlob - DOS like globbing and then some

=head1 SYNOPSIS

    require 5.004;

    # override CORE::glob in current package
    use File::DosGlob 'glob';

    # override CORE::glob in ALL packages (use with extreme caution!)
    use File::DosGlob 'GLOBAL_glob';

    @perlfiles = glob  "..\\pe?l/*.p?";
    print <..\\pe?l/*.p?>;

    # from the command line (overrides only in main::)
    > perl -MFile::DosGlob=glob -e "print <../pe*/*p?>"

=head1 DESCRIPTION

A module that implements DOS-like globbing with a few enhancements.
It is largely compatible with perlglob.exe (the M$ setargv.obj
version) in all but one respect--it understands wildcards in
directory components.

For example, C<<..\\l*b\\file/*glob.p?>> will work as expected (in
that it will find something like '..\lib\File/DosGlob.pm' alright).
Note that all path components are case-insensitive, and that
backslashes and forward slashes are both accepted, and preserved.
You may have to double the backslashes if you are putting them in
literally, due to double-quotish parsing of the pattern by perl.

Spaces in the argument delimit distinct patterns, so
C<glob('*.exe *.dll')> globs all filenames that end in C<.exe>
or C<.dll>.  If you want to put in literal spaces in the glob
pattern, you can escape them with either double quotes, or backslashes.
e.g. C<glob('c:/"Program Files"/*/*.dll')>, or
C<glob('c:/Program\ Files/*/*.dll')>.  The argument is tokenized using
C<Text::ParseWords::parse_line()>, so see L<Text::ParseWords> for details
of the quoting rules used.

Extending it to csh patterns is left as an exercise to the reader.

=head1 NOTES

=over 4

=item *

Mac OS (Classic) users should note a few differences. The specification 
of pathnames in glob patterns adheres to the usual Mac OS conventions: 
The path separator is a colon ':', not a slash '/' or backslash '\'. A 
full path always begins with a volume name. A relative pathname on Mac 
OS must always begin with a ':', except when specifying a file or 
directory name in the current working directory, where the leading colon 
is optional. If specifying a volume name only, a trailing ':' is 
required. Due to these rules, a glob like E<lt>*:E<gt> will find all 
mounted volumes, while a glob like E<lt>*E<gt> or E<lt>:*E<gt> will find 
all files and directories in the current directory.

Note that updirs in the glob pattern are resolved before the matching begins,
i.e. a pattern like "*HD:t?p::a*" will be matched as "*HD:a*". Note also,
that a single trailing ':' in the pattern is ignored (unless it's a volume
name pattern like "*HD:"), i.e. a glob like <:*:> will find both directories 
I<and> files (and not, as one might expect, only directories). 

The metachars '*', '?' and the escape char '\' are valid characters in 
volume, directory and file names on Mac OS. Hence, if you want to match
a '*', '?' or '\' literally, you have to escape these characters. Due to 
perl's quoting rules, things may get a bit complicated, when you want to 
match a string like '\*' literally, or when you want to match '\' literally, 
but treat the immediately following character '*' as metachar. So, here's a 
rule of thumb (applies to both single- and double-quoted strings): escape 
each '*' or '?' or '\' with a backslash, if you want to treat them literally, 
and then double each backslash and your are done. E.g. 

- Match '\*' literally

   escape both '\' and '*'  : '\\\*'
   double the backslashes   : '\\\\\\*'

(Internally, the glob routine sees a '\\\*', which means that both '\' and 
'*' are escaped.)


- Match '\' literally, treat '*' as metachar

   escape '\' but not '*'   : '\\*'
   double the backslashes   : '\\\\*'

(Internally, the glob routine sees a '\\*', which means that '\' is escaped and 
'*' is not.)

Note that you also have to quote literal spaces in the glob pattern, as described
above.

=back

=head1 EXPORTS (by request only)

glob()

=head1 BUGS

Should probably be built into the core, and needs to stop
pandering to DOS habits.  Needs a dose of optimizium too.

=head1 AUTHOR

Gurusamy Sarathy <gsar@activestate.com>

=head1 HISTORY

=over 4

=item *

Support for globally overriding glob() (GSAR 3-JUN-98)

=item *

Scalar context, independent iterator context fixes (GSAR 15-SEP-97)

=item *

A few dir-vs-file optimizations result in glob importation being
10 times faster than using perlglob.exe, and using perlglob.bat is
only twice as slow as perlglob.exe (GSAR 28-MAY-97)

=item *

Several cleanups prompted by lack of compatible perlglob.exe
under Borland (GSAR 27-MAY-97)

=item *

Initial version (GSAR 20-FEB-97)

=back

=head1 SEE ALSO

perl

perlglob.bat

Text::ParseWords

=cut