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1 | #!perl -w |
2 | |
3 | # |
4 | # Documentation at the __END__ |
5 | # |
6 | |
7 | package File::DosGlob; |
8 | |
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9 | our $VERSION = '1.00'; |
10 | use strict; |
11 | |
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12 | sub doglob { |
13 | my $cond = shift; |
14 | my @retval = (); |
15 | #print "doglob: ", join('|', @_), "\n"; |
16 | OUTER: |
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17 | for my $pat (@_) { |
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18 | my @matched = (); |
19 | my @globdirs = (); |
20 | my $head = '.'; |
21 | my $sepchr = '/'; |
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22 | my $tail; |
23 | next OUTER unless defined $pat and $pat ne ''; |
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24 | # if arg is within quotes strip em and do no globbing |
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25 | if ($pat =~ /^"(.*)"\z/s) { |
26 | $pat = $1; |
27 | if ($cond eq 'd') { push(@retval, $pat) if -d $pat } |
28 | else { push(@retval, $pat) if -e $pat } |
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29 | next OUTER; |
30 | } |
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31 | # wildcards with a drive prefix such as h:*.pm must be changed |
32 | # to h:./*.pm to expand correctly |
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33 | if ($pat =~ m|^([A-Za-z]:)[^/\\]|s) { |
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34 | substr($_,0,2) = $1 . "./"; |
35 | } |
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36 | if ($pat =~ m|^(.*)([\\/])([^\\/]*)\z|s) { |
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37 | ($head, $sepchr, $tail) = ($1,$2,$3); |
38 | #print "div: |$head|$sepchr|$tail|\n"; |
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39 | push (@retval, $pat), next OUTER if $tail eq ''; |
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40 | if ($head =~ /[*?]/) { |
41 | @globdirs = doglob('d', $head); |
42 | push(@retval, doglob($cond, map {"$_$sepchr$tail"} @globdirs)), |
43 | next OUTER if @globdirs; |
44 | } |
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45 | $head .= $sepchr if $head eq '' or $head =~ /^[A-Za-z]:\z/s; |
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46 | $pat = $tail; |
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47 | } |
48 | # |
49 | # If file component has no wildcards, we can avoid opendir |
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50 | unless ($pat =~ /[*?]/) { |
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51 | $head = '' if $head eq '.'; |
52 | $head .= $sepchr unless $head eq '' or substr($head,-1) eq $sepchr; |
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53 | $head .= $pat; |
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54 | if ($cond eq 'd') { push(@retval,$head) if -d $head } |
55 | else { push(@retval,$head) if -e $head } |
56 | next OUTER; |
57 | } |
58 | opendir(D, $head) or next OUTER; |
59 | my @leaves = readdir D; |
60 | closedir D; |
61 | $head = '' if $head eq '.'; |
62 | $head .= $sepchr unless $head eq '' or substr($head,-1) eq $sepchr; |
63 | |
64 | # escape regex metachars but not glob chars |
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65 | $pat =~ s:([].+^\-\${}[|]):\\$1:g; |
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66 | # and convert DOS-style wildcards to regex |
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67 | $pat =~ s/\*/.*/g; |
68 | $pat =~ s/\?/.?/g; |
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69 | |
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70 | #print "regex: '$pat', head: '$head'\n"; |
71 | my $matchsub = sub { $_[0] =~ m|^$pat\z|is }; |
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72 | INNER: |
73 | for my $e (@leaves) { |
74 | next INNER if $e eq '.' or $e eq '..'; |
75 | next INNER if $cond eq 'd' and ! -d "$head$e"; |
76 | push(@matched, "$head$e"), next INNER if &$matchsub($e); |
77 | # |
78 | # [DOS compatibility special case] |
79 | # Failed, add a trailing dot and try again, but only |
80 | # if name does not have a dot in it *and* pattern |
81 | # has a dot *and* name is shorter than 9 chars. |
82 | # |
83 | if (index($e,'.') == -1 and length($e) < 9 |
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84 | and index($pat,'\\.') != -1) { |
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85 | push(@matched, "$head$e"), next INNER if &$matchsub("$e."); |
86 | } |
87 | } |
88 | push @retval, @matched if @matched; |
89 | } |
90 | return @retval; |
91 | } |
92 | |
93 | # |
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94 | # this can be used to override CORE::glob in a specific |
95 | # package by saying C<use File::DosGlob 'glob';> in that |
96 | # namespace. |
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97 | # |
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98 | |
99 | # context (keyed by second cxix arg provided by core) |
100 | my %iter; |
101 | my %entries; |
102 | |
103 | sub glob { |
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104 | my($pat,$cxix) = @_; |
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105 | my @pat; |
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106 | |
107 | # glob without args defaults to $_ |
108 | $pat = $_ unless defined $pat; |
109 | |
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110 | # extract patterns |
111 | if ($pat =~ /\s/) { |
112 | require Text::ParseWords; |
113 | @pat = Text::ParseWords::parse_line('\s+',0,$pat); |
114 | } |
115 | else { |
116 | push @pat, $pat; |
117 | } |
118 | |
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119 | # assume global context if not provided one |
120 | $cxix = '_G_' unless defined $cxix; |
121 | $iter{$cxix} = 0 unless exists $iter{$cxix}; |
122 | |
123 | # if we're just beginning, do it all first |
124 | if ($iter{$cxix} == 0) { |
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125 | $entries{$cxix} = [doglob(1,@pat)]; |
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126 | } |
127 | |
128 | # chuck it all out, quick or slow |
129 | if (wantarray) { |
130 | delete $iter{$cxix}; |
131 | return @{delete $entries{$cxix}}; |
132 | } |
133 | else { |
134 | if ($iter{$cxix} = scalar @{$entries{$cxix}}) { |
135 | return shift @{$entries{$cxix}}; |
136 | } |
137 | else { |
138 | # return undef for EOL |
139 | delete $iter{$cxix}; |
140 | delete $entries{$cxix}; |
141 | return undef; |
142 | } |
143 | } |
144 | } |
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145 | |
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146 | { |
147 | no strict 'refs'; |
148 | |
149 | sub import { |
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150 | my $pkg = shift; |
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151 | return unless @_; |
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152 | my $sym = shift; |
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153 | my $callpkg = ($sym =~ s/^GLOBAL_//s ? 'CORE::GLOBAL' : caller(0)); |
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154 | *{$callpkg.'::'.$sym} = \&{$pkg.'::'.$sym} if $sym eq 'glob'; |
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155 | } |
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156 | } |
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157 | 1; |
158 | |
159 | __END__ |
160 | |
161 | =head1 NAME |
162 | |
163 | File::DosGlob - DOS like globbing and then some |
164 | |
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165 | =head1 SYNOPSIS |
166 | |
167 | require 5.004; |
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168 | |
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169 | # override CORE::glob in current package |
170 | use File::DosGlob 'glob'; |
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171 | |
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172 | # override CORE::glob in ALL packages (use with extreme caution!) |
173 | use File::DosGlob 'GLOBAL_glob'; |
174 | |
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175 | @perlfiles = glob "..\\pe?l/*.p?"; |
176 | print <..\\pe?l/*.p?>; |
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177 | |
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178 | # from the command line (overrides only in main::) |
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179 | > perl -MFile::DosGlob=glob -e "print <../pe*/*p?>" |
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180 | |
181 | =head1 DESCRIPTION |
182 | |
183 | A module that implements DOS-like globbing with a few enhancements. |
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184 | It is largely compatible with perlglob.exe (the M$ setargv.obj |
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185 | version) in all but one respect--it understands wildcards in |
186 | directory components. |
187 | |
188 | For example, C<<..\\l*b\\file/*glob.p?>> will work as expected (in |
189 | that it will find something like '..\lib\File/DosGlob.pm' alright). |
190 | Note that all path components are case-insensitive, and that |
191 | backslashes and forward slashes are both accepted, and preserved. |
192 | You may have to double the backslashes if you are putting them in |
193 | literally, due to double-quotish parsing of the pattern by perl. |
194 | |
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195 | Spaces in the argument delimit distinct patterns, so |
196 | C<glob('*.exe *.dll')> globs all filenames that end in C<.exe> |
197 | or C<.dll>. If you want to put in literal spaces in the glob |
198 | pattern, you can escape them with either double quotes, or backslashes. |
199 | e.g. C<glob('c:/"Program Files"/*/*.dll')>, or |
200 | C<glob('c:/Program\ Files/*/*.dll')>. The argument is tokenized using |
201 | C<Text::ParseWords::parse_line()>, so see L<Text::ParseWords> for details |
202 | of the quoting rules used. |
203 | |
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204 | Extending it to csh patterns is left as an exercise to the reader. |
205 | |
206 | =head1 EXPORTS (by request only) |
207 | |
208 | glob() |
209 | |
210 | =head1 BUGS |
211 | |
212 | Should probably be built into the core, and needs to stop |
213 | pandering to DOS habits. Needs a dose of optimizium too. |
214 | |
215 | =head1 AUTHOR |
216 | |
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217 | Gurusamy Sarathy <gsar@activestate.com> |
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218 | |
219 | =head1 HISTORY |
220 | |
221 | =over 4 |
222 | |
223 | =item * |
224 | |
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225 | Support for globally overriding glob() (GSAR 3-JUN-98) |
226 | |
227 | =item * |
228 | |
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229 | Scalar context, independent iterator context fixes (GSAR 15-SEP-97) |
230 | |
231 | =item * |
232 | |
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233 | A few dir-vs-file optimizations result in glob importation being |
234 | 10 times faster than using perlglob.exe, and using perlglob.bat is |
235 | only twice as slow as perlglob.exe (GSAR 28-MAY-97) |
236 | |
237 | =item * |
238 | |
239 | Several cleanups prompted by lack of compatible perlglob.exe |
240 | under Borland (GSAR 27-MAY-97) |
241 | |
242 | =item * |
243 | |
244 | Initial version (GSAR 20-FEB-97) |
245 | |
246 | =back |
247 | |
248 | =head1 SEE ALSO |
249 | |
250 | perl |
251 | |
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252 | perlglob.bat |
253 | |
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254 | Text::ParseWords |
255 | |
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256 | =cut |
257 | |