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| Current File : //usr/local/lib/perl5/5.8.9/File/DosGlob.pm |
#!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 = '1.01';
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($pat,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