Commit | Line | Data |
---|---|---|
86a59229 | 1 | #!/usr/bin/perl |
4633a7c4 LW |
2 | |
3 | use Config; | |
4 | use File::Basename qw(&basename &dirname); | |
8a5546a1 | 5 | use Cwd; |
231bc313 JH |
6 | use subs qw(link); |
7 | ||
6ef9d486 | 8 | sub link { # This is a cut-down version of installperl:link(). |
231bc313 JH |
9 | my($from,$to) = @_; |
10 | my($success) = 0; | |
11 | ||
12 | eval { | |
13 | CORE::link($from, $to) | |
14 | ? $success++ | |
15 | : ($from =~ m#^/afs/# || $to =~ m#^/afs/#) | |
16 | ? die "AFS" # okay inside eval {} | |
17 | : die "Couldn't link $from to $to: $!\n"; | |
18 | }; | |
19 | if ($@) { | |
231bc313 JH |
20 | require File::Copy; |
21 | File::Copy::copy($from, $to) | |
22 | ? $success++ | |
23 | : warn "Couldn't copy $from to $to: $!\n"; | |
24 | } | |
25 | $success; | |
26 | } | |
4633a7c4 LW |
27 | |
28 | # List explicitly here the variables you want Configure to | |
29 | # generate. Metaconfig only looks for shell variables, so you | |
30 | # have to mention them as if they were shell variables, not | |
31 | # %Config entries. Thus you write | |
32 | # $startperl | |
33 | # to ensure Configure will look for $Config{startperl}. | |
34 | ||
35 | # This forces PL files to create target in same directory as PL file. | |
36 | # This is so that make depend always knows where to find PL derivatives. | |
8a5546a1 | 37 | $origdir = cwd; |
44a8e56a | 38 | chdir dirname($0); |
39 | $file = basename($0, '.PL'); | |
774d564b | 40 | $file .= '.com' if $^O eq 'VMS'; |
4633a7c4 LW |
41 | |
42 | open OUT,">$file" or die "Can't create $file: $!"; | |
43 | ||
44 | print "Extracting $file (with variable substitutions)\n"; | |
45 | ||
46 | # In this section, perl variables will be expanded during extraction. | |
47 | # You can use $Config{...} to use Configure variables. | |
48 | ||
49 | print OUT <<"!GROK!THIS!"; | |
5f05dabc | 50 | $Config{startperl} |
51 | eval 'exec $Config{perlpath} -S \$0 \${1+"\$@"}' | |
52 | if \$running_under_some_shell; | |
c0393c90 JH |
53 | my \$startperl; |
54 | my \$perlpath; | |
ed6d8ea1 JH |
55 | (\$startperl = <<'/../') =~ s/\\s*\\z//; |
56 | $Config{startperl} | |
57 | /../ | |
58 | (\$perlpath = <<'/../') =~ s/\\s*\\z//; | |
59 | $Config{perlpath} | |
60 | /../ | |
a687059c LW |
61 | !GROK!THIS! |
62 | ||
4633a7c4 LW |
63 | # In the following, perl variables are not expanded during extraction. |
64 | ||
65 | print OUT <<'!NO!SUBS!'; | |
a687059c | 66 | |
9ae2b9a0 | 67 | $0 =~ s/^.*?(\w+)[\.\w]*$/$1/; |
86a59229 WL |
68 | |
69 | # (p)sed - a stream editor | |
70 | # History: Aug 12 2000: Original version. | |
d16f50bd | 71 | # Mar 25 2002: Rearrange generated Perl program. |
86a59229 WL |
72 | |
73 | use strict; | |
74 | use integer; | |
75 | use Symbol; | |
8d063cd8 | 76 | |
d83e3bda JM |
77 | =head1 NAME |
78 | ||
ba34211e | 79 | psed - a stream editor |
d83e3bda JM |
80 | |
81 | =head1 SYNOPSIS | |
82 | ||
ba34211e JH |
83 | psed [-an] script [file ...] |
84 | psed [-an] [-e script] [-f script-file] [file ...] | |
85 | ||
86 | s2p [-an] [-e script] [-f script-file] | |
d83e3bda JM |
87 | |
88 | =head1 DESCRIPTION | |
89 | ||
86a59229 WL |
90 | A stream editor reads the input stream consisting of the specified files |
91 | (or standard input, if none are given), processes is line by line by | |
92 | applying a script consisting of edit commands, and writes resulting lines | |
93 | to standard output. The filename `C<->' may be used to read standard input. | |
94 | ||
95 | The edit script is composed from arguments of B<-e> options and | |
96 | script-files, in the given order. A single script argument may be specified | |
97 | as the first parameter. | |
98 | ||
99 | If this program is invoked with the name F<s2p>, it will act as a | |
100 | sed-to-Perl translator. See L<"sed Script Translation">. | |
d83e3bda | 101 | |
86a59229 | 102 | B<sed> returns an exit code of 0 on success or >0 if an error occurred. |
d83e3bda | 103 | |
86a59229 | 104 | =head1 OPTIONS |
d83e3bda | 105 | |
86a59229 | 106 | =over 4 |
d83e3bda | 107 | |
86a59229 | 108 | =item B<-a> |
d83e3bda | 109 | |
86a59229 WL |
110 | A file specified as argument to the B<w> edit command is by default |
111 | opened before input processing starts. Using B<-a>, opening of such | |
112 | files is delayed until the first line is actually written to the file. | |
113 | ||
114 | =item B<-e> I<script> | |
115 | ||
116 | The editing commands defined by I<script> are appended to the script. | |
117 | Multiple commands must be separated by newlines. | |
118 | ||
119 | =item B<-f> I<script-file> | |
120 | ||
121 | Editing commands from the specified I<script-file> are read and appended | |
122 | to the script. | |
d83e3bda JM |
123 | |
124 | =item B<-n> | |
125 | ||
86a59229 WL |
126 | By default, a line is written to standard output after the editing script |
127 | has been applied to it. The B<-n> option suppresses automatic printing. | |
128 | ||
129 | =back | |
130 | ||
131 | =head1 COMMANDS | |
132 | ||
133 | B<sed> command syntax is defined as | |
134 | ||
135 | Z<> Z<> Z<> Z<>[I<address>[B<,>I<address>]][B<!>]I<function>[I<argument>] | |
136 | ||
137 | with whitespace being permitted before or after addresses, and between | |
138 | the function character and the argument. The I<address>es and the | |
139 | address inverter (C<!>) are used to restrict the application of a | |
140 | command to the selected line(s) of input. | |
141 | ||
142 | Each command must be on a line of its own, except where noted in | |
143 | the synopses below. | |
144 | ||
145 | The edit cycle performed on each input line consist of reading the line | |
146 | (without its trailing newline character) into the I<pattern space>, | |
147 | applying the applicable commands of the edit script, writing the final | |
148 | contents of the pattern space and a newline to the standard output. | |
149 | A I<hold space> is provided for saving the contents of the | |
150 | pattern space for later use. | |
151 | ||
152 | =head2 Addresses | |
153 | ||
154 | A sed address is either a line number or a pattern, which may be combined | |
155 | arbitrarily to construct ranges. Lines are numbered across all input files. | |
156 | ||
157 | Any address may be followed by an exclamation mark (`C<!>'), selecting | |
158 | all lines not matching that address. | |
d83e3bda | 159 | |
86a59229 | 160 | =over 4 |
d83e3bda | 161 | |
86a59229 WL |
162 | =item I<number> |
163 | ||
164 | The line with the given number is selected. | |
165 | ||
166 | =item B<$> | |
167 | ||
168 | A dollar sign (C<$>) is the line number of the last line of the input stream. | |
169 | ||
170 | =item B</>I<regular expression>B</> | |
171 | ||
172 | A pattern address is a basic regular expression (see | |
173 | L<"Basic Regular Expressions">), between the delimiting character C</>. | |
174 | Any other character except C<\> or newline may be used to delimit a | |
175 | pattern address when the initial delimiter is prefixed with a | |
176 | backslash (`C<\>'). | |
d83e3bda JM |
177 | |
178 | =back | |
179 | ||
86a59229 | 180 | If no address is given, the command selects every line. |
d83e3bda | 181 | |
86a59229 WL |
182 | If one address is given, it selects the line (or lines) matching the |
183 | address. | |
d83e3bda | 184 | |
86a59229 WL |
185 | Two addresses select a range that begins whenever the first address |
186 | matches, and ends (including that line) when the second address matches. | |
187 | If the first (second) address is a matching pattern, the second | |
188 | address is not applied to the very same line to determine the end of | |
189 | the range. Likewise, if the second address is a matching pattern, the | |
190 | first address is not applied to the very same line to determine the | |
191 | begin of another range. If both addresses are line numbers, | |
192 | and the second line number is less than the first line number, then | |
193 | only the first line is selected. | |
d83e3bda | 194 | |
d83e3bda | 195 | |
86a59229 | 196 | =head2 Functions |
d83e3bda | 197 | |
86a59229 WL |
198 | The maximum permitted number of addresses is indicated with each |
199 | function synopsis below. | |
d83e3bda | 200 | |
86a59229 WL |
201 | The argument I<text> consists of one or more lines following the command. |
202 | Embedded newlines in I<text> must be preceded with a backslash. Other | |
203 | backslashes in I<text> are deleted and the following character is taken | |
204 | literally. | |
d83e3bda | 205 | |
86a59229 | 206 | =over 4 |
d83e3bda | 207 | |
86a59229 WL |
208 | =cut |
209 | ||
210 | my %ComTab; | |
d16f50bd | 211 | my %GenKey; |
86a59229 WL |
212 | #-------------------------------------------------------------------------- |
213 | $ComTab{'a'}=[ 1, 'txt', \&Emit, '{ push( @Q, <<'."'TheEnd' ) }\n" ]; #ok | |
214 | ||
215 | =item [1addr]B<a\> I<text> | |
216 | ||
217 | Write I<text> (which must start on the line following the command) | |
218 | to standard output immediately before reading the next line | |
219 | of input, either by executing the B<N> function or by beginning a new cycle. | |
220 | ||
221 | =cut | |
222 | ||
223 | #-------------------------------------------------------------------------- | |
224 | $ComTab{'b'}=[ 2, 'str', \&Branch, '{ goto XXX; }' ]; #ok | |
225 | ||
226 | =item [2addr]B<b> [I<label>] | |
227 | ||
228 | Branch to the B<:> function with the specified I<label>. If no label | |
229 | is given, branch to the end of the script. | |
230 | ||
231 | =cut | |
232 | ||
233 | #-------------------------------------------------------------------------- | |
234 | $ComTab{'c'}=[ 2, 'txt', \&Change, <<'-X-' ]; #ok | |
235 | { print <<'TheEnd'; } $doPrint = 0; goto EOS; | |
236 | -X- | |
237 | ### continue OK => next CYCLE; | |
238 | ||
239 | =item [2addr]B<c\> I<text> | |
240 | ||
241 | The line, or range of lines, selected by the address is deleted. | |
242 | The I<text> (which must start on the line following the command) | |
243 | is written to standard output. With an address range, this occurs at | |
244 | the end of the range. | |
245 | ||
246 | =cut | |
247 | ||
248 | #-------------------------------------------------------------------------- | |
249 | $ComTab{'d'}=[ 2, '', \&Emit, <<'-X-' ]; #ok | |
250 | { $doPrint = 0; | |
251 | goto EOS; | |
252 | } | |
253 | -X- | |
254 | ### continue OK => next CYCLE; | |
255 | ||
256 | =item [2addr]B<d> | |
257 | ||
258 | Deletes the pattern space and starts the next cycle. | |
259 | ||
260 | =cut | |
261 | ||
262 | #-------------------------------------------------------------------------- | |
263 | $ComTab{'D'}=[ 2, '', \&Emit, <<'-X-' ]; #ok | |
264 | { s/^.*\n?//; | |
265 | if(length($_)){ goto BOS } else { goto EOS } | |
266 | } | |
267 | -X- | |
268 | ### continue OK => next CYCLE; | |
269 | ||
270 | =item [2addr]B<D> | |
271 | ||
272 | Deletes the pattern space through the first embedded newline or to the end. | |
273 | If the pattern space becomes empty, a new cycle is started, otherwise | |
274 | execution of the script is restarted. | |
275 | ||
276 | =cut | |
277 | ||
278 | #-------------------------------------------------------------------------- | |
279 | $ComTab{'g'}=[ 2, '', \&Emit, '{ $_ = $Hold };' ]; #ok | |
280 | ||
281 | =item [2addr]B<g> | |
282 | ||
283 | Replace the contents of the pattern space with the hold space. | |
284 | ||
285 | =cut | |
286 | ||
287 | #-------------------------------------------------------------------------- | |
288 | $ComTab{'G'}=[ 2, '', \&Emit, '{ $_ .= "\n"; $_ .= $Hold };' ]; #ok | |
289 | ||
290 | =item [2addr]B<G> | |
291 | ||
292 | Append a newline and the contents of the hold space to the pattern space. | |
293 | ||
294 | =cut | |
295 | ||
296 | #-------------------------------------------------------------------------- | |
297 | $ComTab{'h'}=[ 2, '', \&Emit, '{ $Hold = $_ }' ]; #ok | |
298 | ||
299 | =item [2addr]B<h> | |
300 | ||
301 | Replace the contents of the hold space with the pattern space. | |
302 | ||
303 | =cut | |
304 | ||
305 | #-------------------------------------------------------------------------- | |
306 | $ComTab{'H'}=[ 2, '', \&Emit, '{ $Hold .= "\n"; $Hold .= $_; }' ]; #ok | |
307 | ||
308 | =item [2addr]B<H> | |
309 | ||
310 | Append a newline and the contents of the pattern space to the hold space. | |
311 | ||
312 | =cut | |
313 | ||
314 | #-------------------------------------------------------------------------- | |
315 | $ComTab{'i'}=[ 1, 'txt', \&Emit, '{ print <<'."'TheEnd' }\n" ]; #ok | |
316 | ||
317 | =item [1addr]B<i\> I<text> | |
318 | ||
319 | Write the I<text> (which must start on the line following the command) | |
320 | to standard output. | |
321 | ||
322 | =cut | |
323 | ||
324 | #-------------------------------------------------------------------------- | |
325 | $ComTab{'l'}=[ 2, '', \&Emit, '{ _l() }' ]; #okUTF8 | |
326 | ||
327 | =item [2addr]B<l> | |
328 | ||
329 | Print the contents of the pattern space: non-printable characters are | |
330 | shown in C-style escaped form; long lines are split and have a trailing | |
331 | `C<\>' at the point of the split; the true end of a line is marked with | |
332 | a `C<$>'. Escapes are: `\a', `\t', `\n', `\f', `\r', `\e' for | |
333 | BEL, HT, LF, FF, CR, ESC, respectively, and `\' followed by a three-digit | |
334 | octal number for all other non-printable characters. | |
335 | ||
336 | =cut | |
337 | ||
338 | #-------------------------------------------------------------------------- | |
339 | $ComTab{'n'}=[ 2, '', \&Emit, <<'-X-' ]; #ok | |
340 | { print $_, "\n" if $doPrint; | |
d16f50bd | 341 | printQ() if @Q; |
86a59229 WL |
342 | $CondReg = 0; |
343 | last CYCLE unless getsARGV(); | |
344 | chomp(); | |
345 | } | |
346 | -X- | |
347 | ||
348 | =item [2addr]B<n> | |
349 | ||
350 | If automatic printing is enabled, write the pattern space to the standard | |
351 | output. Replace the pattern space with the next line of input. If | |
352 | there is no more input, processing is terminated. | |
353 | ||
354 | =cut | |
355 | ||
356 | #-------------------------------------------------------------------------- | |
357 | $ComTab{'N'}=[ 2, '', \&Emit, <<'-X-' ]; #ok | |
d16f50bd | 358 | { printQ() if @Q; |
86a59229 WL |
359 | $CondReg = 0; |
360 | last CYCLE unless getsARGV( $h ); | |
361 | chomp( $h ); | |
362 | $_ .= "\n$h"; | |
363 | } | |
364 | -X- | |
365 | ||
366 | =item [2addr]B<N> | |
367 | ||
368 | Append a newline and the next line of input to the pattern space. If | |
369 | there is no more input, processing is terminated. | |
370 | ||
371 | =cut | |
372 | ||
373 | #-------------------------------------------------------------------------- | |
374 | $ComTab{'p'}=[ 2, '', \&Emit, '{ print $_, "\n"; }' ]; #ok | |
375 | ||
376 | =item [2addr]B<p> | |
377 | ||
378 | Print the pattern space to the standard output. (Use the B<-n> option | |
379 | to suppress automatic printing at the end of a cycle if you want to | |
380 | avoid double printing of lines.) | |
381 | ||
382 | =cut | |
383 | ||
384 | #-------------------------------------------------------------------------- | |
385 | $ComTab{'P'}=[ 2, '', \&Emit, <<'-X-' ]; #ok | |
386 | { if( /^(.*)/ ){ print $1, "\n"; } } | |
387 | -X- | |
388 | ||
389 | =item [2addr]B<P> | |
390 | ||
391 | Prints the pattern space through the first embedded newline or to the end. | |
392 | ||
393 | =cut | |
394 | ||
395 | #-------------------------------------------------------------------------- | |
396 | $ComTab{'q'}=[ 1, '', \&Emit, <<'-X-' ]; #ok | |
397 | { print $_, "\n" if $doPrint; | |
398 | last CYCLE; | |
399 | } | |
400 | -X- | |
401 | ||
402 | =item [1addr]B<q> | |
403 | ||
404 | Branch to the end of the script and quit without starting a new cycle. | |
405 | ||
406 | =cut | |
407 | ||
408 | #-------------------------------------------------------------------------- | |
409 | $ComTab{'r'}=[ 1, 'str', \&Emit, "{ _r( '-X-' ) }" ]; #ok | |
86a59229 WL |
410 | |
411 | =item [1addr]B<r> I<file> | |
412 | ||
413 | Copy the contents of the I<file> to standard output immediately before | |
414 | the next attempt to read a line of input. Any error encountered while | |
415 | reading I<file> is silently ignored. | |
416 | ||
417 | =cut | |
418 | ||
419 | #-------------------------------------------------------------------------- | |
420 | $ComTab{'s'}=[ 2, 'sub', \&Emit, '' ]; #ok | |
421 | ||
422 | =item [2addr]B<s/>I<regular expression>B</>I<replacement>B</>I<flags> | |
423 | ||
424 | Substitute the I<replacement> string for the first substring in | |
425 | the pattern space that matches the I<regular expression>. | |
426 | Any character other than backslash or newline can be used instead of a | |
427 | slash to delimit the regular expression and the replacement. | |
428 | To use the delimiter as a literal character within the regular expression | |
429 | and the replacement, precede the character by a backslash (`C<\>'). | |
430 | ||
431 | Literal newlines may be embedded in the replacement string by | |
432 | preceding a newline with a backslash. | |
433 | ||
434 | Within the replacement, an ampersand (`C<&>') is replaced by the string | |
435 | matching the regular expression. The strings `C<\1>' through `C<\9>' are | |
436 | replaced by the corresponding subpattern (see L<"Basic Regular Expressions">). | |
437 | To get a literal `C<&>' or `C<\>' in the replacement text, precede it | |
438 | by a backslash. | |
439 | ||
440 | The following I<flags> modify the behaviour of the B<s> command: | |
441 | ||
442 | =over 8 | |
443 | ||
444 | =item B<g> | |
445 | ||
446 | The replacement is performed for all matching, non-overlapping substrings | |
447 | of the pattern space. | |
448 | ||
449 | =item B<1>..B<9> | |
450 | ||
451 | Replace only the n-th matching substring of the pattern space. | |
452 | ||
453 | =item B<p> | |
454 | ||
455 | If the substitution was made, print the new value of the pattern space. | |
456 | ||
457 | =item B<w> I<file> | |
458 | ||
459 | If the substitution was made, write the new value of the pattern space | |
460 | to the specified file. | |
461 | ||
462 | =back | |
463 | ||
464 | =cut | |
465 | ||
466 | #-------------------------------------------------------------------------- | |
467 | $ComTab{'t'}=[ 2, 'str', \&Branch, '{ goto XXX if _t() }' ]; #ok | |
468 | ||
469 | =item [2addr]B<t> [I<label>] | |
470 | ||
471 | Branch to the B<:> function with the specified I<label> if any B<s> | |
472 | substitutions have been made since the most recent reading of an input line | |
473 | or execution of a B<t> function. If no label is given, branch to the end of | |
474 | the script. | |
475 | ||
476 | ||
477 | =cut | |
478 | ||
479 | #-------------------------------------------------------------------------- | |
480 | $ComTab{'w'}=[ 2, 'str', \&Write, "{ _w( '-X-' ) }" ]; #ok | |
481 | ||
482 | =item [2addr]B<w> I<file> | |
483 | ||
484 | The contents of the pattern space are written to the I<file>. | |
485 | ||
486 | =cut | |
487 | ||
488 | #-------------------------------------------------------------------------- | |
489 | $ComTab{'x'}=[ 2, '', \&Emit, '{ ($Hold, $_) = ($_, $Hold) }' ]; #ok | |
490 | ||
491 | =item [2addr]B<x> | |
492 | ||
493 | Swap the contents of the pattern space and the hold space. | |
494 | ||
495 | =cut | |
496 | ||
497 | #-------------------------------------------------------------------------- | |
498 | $ComTab{'y'}=[ 2, 'tra', \&Emit, '' ]; #ok | |
499 | =item [2addr]B<y>B</>I<string1>B</>I<string2>B</> | |
500 | ||
501 | In the pattern space, replace all characters occuring in I<string1> by the | |
502 | character at the corresponding position in I<string2>. It is possible | |
503 | to use any character (other than a backslash or newline) instead of a | |
504 | slash to delimit the strings. Within I<string1> and I<string2>, a | |
505 | backslash followed by any character other than a newline is that literal | |
506 | character, and a backslash followed by an `n' is replaced by a newline | |
507 | character. | |
508 | ||
509 | =cut | |
d83e3bda | 510 | |
86a59229 WL |
511 | #-------------------------------------------------------------------------- |
512 | $ComTab{'='}=[ 1, '', \&Emit, '{ print "$.\n" }' ]; #ok | |
513 | ||
514 | =item [1addr]B<=> | |
515 | ||
516 | Prints the current line number on the standard output. | |
517 | ||
518 | =cut | |
519 | ||
520 | #-------------------------------------------------------------------------- | |
521 | $ComTab{':'}=[ 0, 'str', \&Label, '' ]; #ok | |
522 | ||
523 | =item [0addr]B<:> [I<label>] | |
524 | ||
525 | The command specifies the position of the I<label>. It has no other effect. | |
526 | ||
527 | =cut | |
528 | ||
529 | #-------------------------------------------------------------------------- | |
530 | $ComTab{'{'}=[ 2, '', \&BeginBlock, '{' ]; #ok | |
531 | $ComTab{'}'}=[ 0, '', \&EndBlock, ';}' ]; #ok | |
532 | # ';' to avoid warning on empty {}-block | |
533 | ||
534 | =item [2addr]B<{> [I<command>] | |
535 | ||
536 | =item [0addr]B<}> | |
537 | ||
538 | These two commands begin and end a command list. The first command may | |
539 | be given on the same line as the opening B<{> command. The commands | |
540 | within the list are jointly selected by the address(es) given on the | |
541 | B<{> command (but may still have individual addresses). | |
542 | ||
543 | =cut | |
544 | ||
545 | #-------------------------------------------------------------------------- | |
546 | $ComTab{'#'}=[ 0, 'str', \&Comment, '' ]; #ok | |
547 | ||
548 | =item [0addr]B<#> [I<comment>] | |
549 | ||
550 | The entire line is ignored (treated as a comment). If, however, the first | |
551 | two characters in the script are `C<#n>', automatic printing of output is | |
552 | suppressed, as if the B<-n> option were given on the command line. | |
553 | ||
554 | =back | |
555 | ||
556 | =cut | |
557 | ||
558 | use vars qw{ $isEOF $Hold %wFiles @Q $CondReg $doPrint }; | |
559 | ||
560 | my $useDEBUG = exists( $ENV{PSEDDEBUG} ); | |
561 | my $useEXTBRE = $ENV{PSEDEXTBRE} || ''; | |
562 | $useEXTBRE =~ s/[^<>wWyB]//g; # gawk RE's handle these | |
563 | ||
564 | my $doAutoPrint = 1; # automatic printing of pattern space (-n => 0) | |
565 | my $doOpenWrite = 1; # open w command output files at start (-a => 0) | |
566 | my $svOpenWrite = 0; # save $doOpenWrite | |
567 | my $doGenerate = $0 eq 's2p'; | |
568 | ||
569 | # Collected and compiled script | |
570 | # | |
d16f50bd WL |
571 | my( @Commands, %Defined, @BlockStack, %Label, $labNum, $Code, $Func ); |
572 | $Code = ''; | |
86a59229 WL |
573 | |
574 | ################## | |
575 | # Compile Time | |
576 | # | |
577 | # Labels | |
578 | # | |
579 | # Error handling | |
580 | # | |
581 | sub Warn($;$){ | |
582 | my( $msg, $loc ) = @_; | |
583 | $loc ||= ''; | |
584 | $loc .= ': ' if length( $loc ); | |
585 | warn( "$0: $loc$msg\n" ); | |
586 | } | |
587 | ||
588 | $labNum = 0; | |
589 | sub newLabel(){ | |
590 | return 'L_'.++$labNum; | |
591 | } | |
592 | ||
593 | # safeHere: create safe here delimiter and modify opcode and argument | |
594 | # | |
595 | sub safeHere($$){ | |
596 | my( $codref, $argref ) = @_; | |
597 | my $eod = 'EOD000'; | |
598 | while( $$argref =~ /^$eod$/m ){ | |
599 | $eod++; | |
600 | } | |
601 | $$codref =~ s/TheEnd/$eod/e; | |
602 | $$argref .= "$eod\n"; | |
603 | } | |
604 | ||
605 | # Emit: create address logic and emit command | |
606 | # | |
607 | sub Emit($$$$$$){ | |
608 | my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_; | |
609 | my $cond = ''; | |
610 | if( defined( $addr1 ) ){ | |
611 | if( defined( $addr2 ) ){ | |
612 | $addr1 .= $addr2 =~ /^\d+$/ ? "..$addr2" : "...$addr2"; | |
613 | } else { | |
614 | $addr1 .= ' == $.' if $addr1 =~ /^\d+$/; | |
615 | } | |
616 | $cond = $negated ? "unless( $addr1 )\n" : "if( $addr1 )\n"; | |
617 | } | |
618 | ||
619 | if( $opcode eq '' ){ | |
620 | $Code .= "$cond$arg\n"; | |
621 | ||
622 | } elsif( $opcode =~ s/-X-/$arg/e ){ | |
623 | $Code .= "$cond$opcode\n"; | |
624 | ||
625 | } elsif( $opcode =~ /TheEnd/ ){ | |
626 | safeHere( \$opcode, \$arg ); | |
627 | $Code .= "$cond$opcode$arg"; | |
628 | ||
629 | } else { | |
630 | $Code .= "$cond$opcode\n"; | |
631 | } | |
632 | 0; | |
633 | } | |
634 | ||
635 | # Write (w command, w flag): store pathname | |
636 | # | |
637 | sub Write($$$$$$){ | |
638 | my( $addr1, $addr2, $negated, $opcode, $path, $fl ) = @_; | |
639 | $wFiles{$path} = ''; | |
640 | Emit( $addr1, $addr2, $negated, $opcode, $path, $fl ); | |
641 | } | |
642 | ||
643 | ||
644 | # Label (: command): label definition | |
645 | # | |
646 | sub Label($$$$$$){ | |
647 | my( $addr1, $addr2, $negated, $opcode, $lab, $fl ) = @_; | |
648 | my $rc = 0; | |
649 | $lab =~ s/\s+//; | |
650 | if( length( $lab ) ){ | |
651 | my $h; | |
652 | if( ! exists( $Label{$lab} ) ){ | |
653 | $h = $Label{$lab}{name} = newLabel(); | |
654 | } else { | |
655 | $h = $Label{$lab}{name}; | |
656 | if( exists( $Label{$lab}{defined} ) ){ | |
657 | my $dl = $Label{$lab}{defined}; | |
658 | Warn( "duplicate label $lab (first defined at $dl)", $fl ); | |
659 | $rc = 1; | |
660 | } | |
661 | } | |
662 | $Label{$lab}{defined} = $fl; | |
663 | $Code .= "$h:;\n"; | |
664 | } | |
665 | $rc; | |
666 | } | |
667 | ||
668 | # BeginBlock ({ command): push block start | |
669 | # | |
670 | sub BeginBlock($$$$$$){ | |
671 | my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_; | |
672 | push( @BlockStack, [ $fl, $addr1, $addr2, $negated ] ); | |
673 | Emit( $addr1, $addr2, $negated, $opcode, $arg, $fl ); | |
674 | } | |
675 | ||
676 | # EndBlock (} command): check proper nesting | |
677 | # | |
678 | sub EndBlock($$$$$$){ | |
679 | my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_; | |
680 | my $rc; | |
681 | my $jcom = pop( @BlockStack ); | |
682 | if( defined( $jcom ) ){ | |
683 | $rc = Emit( $addr1, $addr2, $negated, $opcode, $arg, $fl ); | |
684 | } else { | |
685 | Warn( "unexpected `}'", $fl ); | |
686 | $rc = 1; | |
687 | } | |
688 | $rc; | |
689 | } | |
690 | ||
691 | # Branch (t, b commands): check or create label, substitute default | |
692 | # | |
693 | sub Branch($$$$$$){ | |
694 | my( $addr1, $addr2, $negated, $opcode, $lab, $fl ) = @_; | |
695 | $lab =~ s/\s+//; # no spaces at end | |
696 | my $h; | |
697 | if( length( $lab ) ){ | |
698 | if( ! exists( $Label{$lab} ) ){ | |
699 | $h = $Label{$lab}{name} = newLabel(); | |
700 | } else { | |
701 | $h = $Label{$lab}{name}; | |
702 | } | |
703 | push( @{$Label{$lab}{used}}, $fl ); | |
704 | } else { | |
705 | $h = 'EOS'; | |
706 | } | |
707 | $opcode =~ s/XXX/$h/e; | |
708 | Emit( $addr1, $addr2, $negated, $opcode, '', $fl ); | |
709 | } | |
710 | ||
711 | # Change (c command): is special due to range end watching | |
712 | # | |
713 | sub Change($$$$$$){ | |
714 | my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_; | |
715 | my $kwd = $negated ? 'unless' : 'if'; | |
716 | if( defined( $addr2 ) ){ | |
717 | $addr1 .= $addr2 =~ /^\d+$/ ? "..$addr2" : "...$addr2"; | |
718 | if( ! $negated ){ | |
719 | $addr1 = '$icnt = ('.$addr1.')'; | |
720 | $opcode = 'if( $icnt =~ /E0$/ )' . $opcode; | |
721 | } | |
722 | } else { | |
723 | $addr1 .= ' == $.' if $addr1 =~ /^\d+$/; | |
724 | } | |
725 | safeHere( \$opcode, \$arg ); | |
726 | $Code .= "$kwd( $addr1 ){\n $opcode$arg}\n"; | |
727 | 0; | |
728 | } | |
729 | ||
730 | ||
731 | # Comment (# command): A no-op. Who would've thought that! | |
732 | # | |
733 | sub Comment($$$$$$){ | |
734 | my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_; | |
735 | ### $Code .= "# $arg\n"; | |
736 | 0; | |
737 | } | |
738 | ||
739 | ||
740 | sub stripRegex($$){ | |
741 | my( $del, $sref ) = @_; | |
742 | my $regex = $del; | |
743 | print "stripRegex:$del:$$sref:\n" if $useDEBUG; | |
744 | while( $$sref =~ s{^(.*?)(\\*)\Q$del\E(\s*)}{}s ){ | |
745 | my $sl = $2; | |
746 | $regex .= $1.$sl.$del; | |
747 | if( length( $sl ) % 2 == 0 ){ | |
748 | return $regex; | |
749 | } | |
750 | $regex .= $3; | |
751 | } | |
752 | undef(); | |
753 | } | |
754 | ||
755 | # stripTrans: take a <del> terminated string from y command | |
756 | # honoring and cleaning up of \-escaped <del>'s | |
757 | # | |
758 | sub stripTrans($$){ | |
759 | my( $del, $sref ) = @_; | |
760 | my $t = ''; | |
761 | print "stripTrans:$del:$$sref:\n" if $useDEBUG; | |
762 | while( $$sref =~ s{^(.*?)(\\*)\Q$del\E}{}s ){ | |
763 | my $sl = $2; | |
764 | $t .= $1; | |
765 | if( length( $sl ) % 2 == 0 ){ | |
766 | $t .= $sl; | |
767 | $t =~ s/\\\\/\\/g; | |
768 | return $t; | |
769 | } | |
770 | chop( $sl ); | |
771 | $t .= $sl.$del.$3; | |
772 | } | |
773 | undef(); | |
774 | } | |
775 | ||
776 | # makey - construct Perl y/// from sed y/// | |
777 | # | |
778 | sub makey($$$){ | |
779 | my( $fr, $to, $fl ) = @_; | |
780 | my $error = 0; | |
781 | ||
782 | # Ensure that any '-' is up front. | |
783 | # Diagnose duplicate contradicting mappings | |
784 | my %tr; | |
785 | for( my $i = 0; $i < length($fr); $i++ ){ | |
786 | my $fc = substr($fr,$i,1); | |
787 | my $tc = substr($to,$i,1); | |
788 | if( exists( $tr{$fc} ) && $tr{$fc} ne $tc ){ | |
3484938b | 789 | Warn( "ambiguous translation for character `$fc' in `y' command", |
86a59229 WL |
790 | $fl ); |
791 | $error++; | |
792 | } | |
793 | $tr{$fc} = $tc; | |
794 | } | |
795 | $fr = $to = ''; | |
796 | if( exists( $tr{'-'} ) ){ | |
797 | ( $fr, $to ) = ( '-', $tr{'-'} ); | |
798 | delete( $tr{'-'} ); | |
799 | } else { | |
800 | $fr = $to = ''; | |
801 | } | |
802 | # might just as well sort it... | |
803 | for my $fc ( sort keys( %tr ) ){ | |
804 | $fr .= $fc; | |
805 | $to .= $tr{$fc}; | |
806 | } | |
807 | # make embedded delimiters and newlines safe | |
808 | $fr =~ s/([{}])/\$1/g; | |
809 | $to =~ s/([{}])/\$1/g; | |
810 | $fr =~ s/\n/\\n/g; | |
811 | $to =~ s/\n/\\n/g; | |
812 | return $error ? undef() : "{ y{$fr}{$to}; }"; | |
813 | } | |
814 | ||
815 | ###### | |
816 | # makes - construct Perl s/// from sed s/// | |
817 | # | |
818 | sub makes($$$$$$$){ | |
819 | my( $regex, $subst, $path, $global, $print, $nmatch, $fl ) = @_; | |
820 | ||
821 | # make embedded newlines safe | |
822 | $regex =~ s/\n/\\n/g; | |
823 | $subst =~ s/\n/\\n/g; | |
824 | ||
825 | my $code; | |
826 | # n-th occurrence | |
827 | # | |
828 | if( length( $nmatch ) ){ | |
829 | $code = <<TheEnd; | |
830 | { \$n = $nmatch; | |
831 | while( --\$n && ( \$s = m ${regex}g ) ){} | |
832 | \$s = ( substr( \$_, pos() ) =~ s ${regex}${subst}s ) if \$s; | |
833 | \$CondReg ||= \$s; | |
834 | TheEnd | |
835 | } else { | |
836 | $code = <<TheEnd; | |
837 | { \$s = s ${regex}${subst}s${global}; | |
838 | \$CondReg ||= \$s; | |
839 | TheEnd | |
840 | } | |
841 | if( $print ){ | |
842 | $code .= ' print $_, "\n" if $s;'."\n"; | |
843 | } | |
844 | if( defined( $path ) ){ | |
845 | $wFiles{$path} = ''; | |
846 | $code .= " _w( '$path' ) if \$s;\n"; | |
d16f50bd | 847 | $GenKey{'w'} = 1; |
86a59229 WL |
848 | } |
849 | $code .= "}"; | |
850 | } | |
851 | ||
852 | =head1 BASIC REGULAR EXPRESSIONS | |
853 | ||
854 | A I<Basic Regular Expression> (BRE), as defined in POSIX 1003.2, consists | |
855 | of I<atoms>, for matching parts of a string, and I<bounds>, specifying | |
856 | repetitions of a preceding atom. | |
857 | ||
858 | =head2 Atoms | |
859 | ||
860 | The possible atoms of a BRE are: B<.>, matching any single character; | |
861 | B<^> and B<$>, matching the null string at the beginning or end | |
862 | of a string, respectively; a I<bracket expressions>, enclosed | |
863 | in B<[> and B<]> (see below); and any single character with no | |
864 | other significance (matching that character). A B<\> before one | |
865 | of: B<.>, B<^>, B<$>, B<[>, B<*>, B<\>, matching the character | |
866 | after the backslash. A sequence of atoms enclosed in B<\(> and B<\)> | |
867 | becomes an atom and establishes the target for a I<backreference>, | |
868 | consisting of the substring that actually matches the enclosed atoms. | |
869 | Finally, B<\> followed by one of the digits B<0> through B<9> is a | |
870 | backreference. | |
871 | ||
872 | A B<^> that is not first, or a B<$> that is not last does not have | |
873 | a special significance and need not be preceded by a backslash to | |
874 | become literal. The same is true for a B<]>, that does not terminate | |
875 | a bracket expression. | |
876 | ||
877 | An unescaped backslash cannot be last in a BRE. | |
878 | ||
879 | =head2 Bounds | |
880 | ||
881 | The BRE bounds are: B<*>, specifying 0 or more matches of the preceding | |
882 | atom; B<\{>I<count>B<\}>, specifying that many repetitions; | |
883 | B<\{>I<minimum>B<,\}>, giving a lower limit; and | |
884 | B<\{>I<minimum>B<,>I<maximum>B<\}> finally defines a lower and upper | |
885 | bound. | |
886 | ||
887 | A bound appearing as the first item in a BRE is taken literally. | |
888 | ||
889 | =head2 Bracket Expressions | |
890 | ||
891 | A I<bracket expression> is a list of characters, character ranges | |
892 | and character classes enclosed in B<[> and B<]> and matches any | |
893 | single character from the represented set of characters. | |
894 | ||
895 | A character range is written as two characters separated by B<-> and | |
896 | represents all characters (according to the character collating sequence) | |
897 | that are not less than the first and not greater than the second. | |
898 | (Ranges are very collating-sequence-dependent, and portable programs | |
899 | should avoid relying on them.) | |
900 | ||
901 | A character class is one of the class names | |
902 | ||
903 | alnum digit punct | |
904 | alpha graph space | |
905 | blank lower upper | |
906 | cntrl print xdigit | |
907 | ||
908 | enclosed in B<[:> and B<:]> and represents the set of characters | |
909 | as defined in ctype(3). | |
910 | ||
911 | If the first character after B<[> is B<^>, the sense of matching is | |
912 | inverted. | |
913 | ||
914 | To include a literal `C<^>', place it anywhere else but first. To | |
915 | include a literal 'C<]>' place it first or immediately after an | |
916 | initial B<^>. To include a literal `C<->' make it the first (or | |
917 | second after B<^>) or last character, or the second endpoint of | |
918 | a range. | |
919 | ||
920 | The special bracket expression constructs C<[[:E<lt>:]]> and C<[[:E<gt>:]]> | |
921 | match the null string at the beginning and end of a word respectively. | |
922 | (Note that neither is identical to Perl's `\b' atom.) | |
923 | ||
924 | =head2 Additional Atoms | |
925 | ||
926 | Since some sed implementations provide additional regular expression | |
927 | atoms (not defined in POSIX 1003.2), B<psed> is capable of translating | |
928 | the following backslash escapes: | |
929 | ||
930 | =over 4 | |
931 | ||
932 | =item B<\E<lt>> This is the same as C<[[:E<gt>:]]>. | |
933 | ||
934 | =item B<\E<gt>> This is the same as C<[[:E<lt>:]]>. | |
935 | ||
936 | =item B<\w> This is an abbreviation for C<[[:alnum:]_]>. | |
937 | ||
938 | =item B<\W> This is an abbreviation for C<[^[:alnum:]_]>. | |
939 | ||
940 | =item B<\y> Match the empty string at a word boundary. | |
941 | ||
942 | =item B<\B> Match the empty string between any two either word or non-word characters. | |
943 | ||
944 | =back | |
945 | ||
946 | To enable this feature, the environment variable PSEDEXTBRE must be set | |
947 | to a string containing the requested characters, e.g.: | |
948 | C<PSEDEXTBRE='E<lt>E<gt>wW'>. | |
949 | ||
950 | =cut | |
951 | ||
952 | ##### | |
953 | # bre2p - convert BRE to Perl RE | |
954 | # | |
955 | sub peek(\$$){ | |
956 | my( $pref, $ic ) = @_; | |
957 | $ic < length($$pref)-1 ? substr( $$pref, $ic+1, 1 ) : ''; | |
958 | } | |
959 | ||
960 | sub bre2p($$$){ | |
961 | my( $del, $pat, $fl ) = @_; | |
962 | my $led = $del; | |
963 | $led =~ tr/{([</})]>/; | |
964 | $led = '' if $led eq $del; | |
965 | ||
966 | $pat = substr( $pat, 1, length($pat) - 2 ); | |
967 | my $res = ''; | |
968 | my $bracklev = 0; | |
969 | my $backref = 0; | |
970 | my $parlev = 0; | |
971 | for( my $ic = 0; $ic < length( $pat ); $ic++ ){ | |
972 | my $c = substr( $pat, $ic, 1 ); | |
973 | if( $c eq '\\' ){ | |
974 | ### backslash escapes | |
975 | my $nc = peek($pat,$ic); | |
976 | if( $nc eq '' ){ | |
977 | Warn( "`\\' cannot be last in pattern", $fl ); | |
978 | return undef(); | |
979 | } | |
980 | $ic++; | |
981 | if( $nc eq $del ){ ## \<pattern del> => \<pattern del> | |
982 | $res .= "\\$del"; | |
983 | ||
984 | } elsif( $nc =~ /([[.*\\n])/ ){ | |
985 | ## check for \-escaped magics and \n: | |
986 | ## \[ \. \* \\ \n stay as they are | |
987 | $res .= '\\'.$nc; | |
988 | ||
989 | } elsif( $nc eq '(' ){ ## \( => ( | |
990 | $parlev++; | |
991 | $res .= '('; | |
992 | ||
993 | } elsif( $nc eq ')' ){ ## \) => ) | |
994 | $parlev--; | |
995 | $backref++; | |
996 | if( $parlev < 0 ){ | |
997 | Warn( "unmatched `\\)'", $fl ); | |
998 | return undef(); | |
999 | } | |
1000 | $res .= ')'; | |
1001 | ||
1002 | } elsif( $nc eq '{' ){ ## repetition factor \{<i>[,[<j>]]\} | |
1003 | my $endpos = index( $pat, '\\}', $ic ); | |
1004 | if( $endpos < 0 ){ | |
1005 | Warn( "unmatched `\\{'", $fl ); | |
1006 | return undef(); | |
1007 | } | |
1008 | my $rep = substr( $pat, $ic+1, $endpos-($ic+1) ); | |
1009 | $ic = $endpos + 1; | |
1010 | ||
1011 | if( $res =~ /^\^?$/ ){ | |
1012 | $res .= "\\{$rep\}"; | |
1013 | } elsif( $rep =~ /^(\d+)(,?)(\d*)?$/ ){ | |
1014 | my $min = $1; | |
1015 | my $com = $2 || ''; | |
1016 | my $max = $3; | |
1017 | if( length( $max ) ){ | |
1018 | if( $max < $min ){ | |
1019 | Warn( "maximum less than minimum in `\\{$rep\\}'", | |
1020 | $fl ); | |
1021 | return undef(); | |
1022 | } | |
1023 | } else { | |
1024 | $max = ''; | |
1025 | } | |
1026 | # simplify some | |
1027 | if( $min == 0 && $max eq '1' ){ | |
1028 | $res .= '?'; | |
1029 | } elsif( $min == 1 && "$com$max" eq ',' ){ | |
1030 | $res .= '+'; | |
1031 | } elsif( $min == 0 && "$com$max" eq ',' ){ | |
1032 | $res .= '*'; | |
1033 | } else { | |
1034 | $res .= "{$min$com$max}"; | |
1035 | } | |
1036 | } else { | |
1037 | Warn( "invalid repeat clause `\\{$rep\\}'", $fl ); | |
1038 | return undef(); | |
1039 | } | |
1040 | ||
1041 | } elsif( $nc =~ /^[1-9]$/ ){ | |
1042 | ## \1 .. \9 => \1 .. \9, but check for a following digit | |
1043 | if( $nc > $backref ){ | |
1044 | Warn( "invalid backreference ($nc)", $fl ); | |
1045 | return undef(); | |
1046 | } | |
1047 | $res .= "\\$nc"; | |
1048 | if( peek($pat,$ic) =~ /[0-9]/ ){ | |
1049 | $res .= '(?:)'; | |
1050 | } | |
1051 | ||
1052 | } elsif( $useEXTBRE && ( $nc =~ /[$useEXTBRE]/ ) ){ | |
1053 | ## extensions - at most <>wWyB - not in POSIX | |
1054 | if( $nc eq '<' ){ ## \< => \b(?=\w), be precise | |
1055 | $res .= '\\b(?<=\\W)'; | |
1056 | } elsif( $nc eq '>' ){ ## \> => \b(?=\W), be precise | |
1057 | $res .= '\\b(?=\\W)'; | |
1058 | } elsif( $nc eq 'y' ){ ## \y => \b | |
1059 | $res .= '\\b'; | |
1060 | } else { ## \B, \w, \W remain the same | |
1061 | $res .= "\\$nc"; | |
1062 | } | |
1063 | } elsif( $nc eq $led ){ | |
1064 | ## \<closing bracketing-delimiter> - keep '\' | |
1065 | $res .= "\\$nc"; | |
1066 | ||
1067 | } else { ## \ <char> => <char> ("as if `\' were not present") | |
1068 | $res .= $nc; | |
1069 | } | |
1070 | ||
1071 | } elsif( $c eq '.' ){ ## . => . | |
1072 | $res .= $c; | |
1073 | ||
1074 | } elsif( $c eq '*' ){ ## * => * but \* if there's nothing preceding it | |
1075 | if( $res =~ /^\^?$/ ){ | |
1076 | $res .= '\\*'; | |
1077 | } elsif( substr( $res, -1, 1 ) ne '*' ){ | |
1078 | $res .= $c; | |
1079 | } | |
1080 | ||
1081 | } elsif( $c eq '[' ){ | |
1082 | ## parse []: [^...] [^]...] [-...] | |
1083 | my $add = '['; | |
1084 | if( peek($pat,$ic) eq '^' ){ | |
1085 | $ic++; | |
1086 | $add .= '^'; | |
1087 | } | |
1088 | my $nc = peek($pat,$ic); | |
1089 | if( $nc eq ']' || $nc eq '-' ){ | |
1090 | $add .= $nc; | |
1091 | $ic++; | |
1092 | } | |
1093 | # check that [ is not trailing | |
1094 | if( $ic >= length( $pat ) - 1 ){ | |
1095 | Warn( "unmatched `['", $fl ); | |
1096 | return undef(); | |
1097 | } | |
1098 | # look for [:...:] and x-y | |
1099 | my $rstr = substr( $pat, $ic+1 ); | |
1100 | if( $rstr =~ /^((?:\[:\(\w+|[><]\):\]|[^]-](?:-[^]])?)*)/ ){ | |
1101 | my $cnt = $1; | |
1102 | $ic += length( $cnt ); | |
1103 | $cnt =~ s/([\\\$])/\\$1/g; # `\', `$' are magic in Perl [] | |
1104 | # try some simplifications | |
1105 | my $red = $cnt; | |
1106 | if( $red =~ s/0-9// ){ | |
1107 | $cnt = $red.'\d'; | |
1108 | if( $red =~ s/A-Z// && $red =~ s/a-z// && $red =~ s/_// ){ | |
1109 | $cnt = $red.'\w'; | |
1110 | } | |
1111 | } | |
1112 | $add .= $cnt; | |
1113 | ||
1114 | # POSIX 1003.2 has this (optional) for begin/end word | |
1115 | $add = '\\b(?=\\W)' if $add eq '[[:<:]]'; | |
1116 | $add = '\\b(?<=\\W)' if $add eq '[[:>:]]'; | |
1117 | ||
1118 | } | |
1119 | ||
1120 | ## may have a trailing `-' before `]' | |
1121 | if( $ic < length($pat) - 1 && | |
1122 | substr( $pat, $ic+1 ) =~ /^(-?])/ ){ | |
1123 | $ic += length( $1 ); | |
1124 | $add .= $1; | |
1125 | # another simplification | |
1126 | $add =~ s/^\[(\^?)(\\[dw])]$/ $1 eq '^' ? uc($2) : $2 /e; | |
1127 | $res .= $add; | |
1128 | } else { | |
1129 | Warn( "unmatched `['", $fl ); | |
1130 | return undef(); | |
1131 | } | |
3cb6de81 | 1132 | |
86a59229 WL |
1133 | } elsif( $c eq $led ){ ## unescaped <closing bracketing-delimiter> |
1134 | $res .= "\\$c"; | |
d83e3bda | 1135 | |
86a59229 WL |
1136 | } elsif( $c eq ']' ){ ## unmatched ] is not magic |
1137 | $res .= ']'; | |
d83e3bda | 1138 | |
86a59229 WL |
1139 | } elsif( $c =~ /[|+?{}()]/ ){ ## not magic in BRE, but in Perl: \-quote |
1140 | $res .= "\\$c"; | |
d83e3bda | 1141 | |
86a59229 WL |
1142 | } elsif( $c eq '^' ){ ## not magic unless 1st, but in Perl: \-quote |
1143 | $res .= length( $res ) ? '\\^' : '^'; | |
d83e3bda | 1144 | |
86a59229 WL |
1145 | } elsif( $c eq '$' ){ ## not magic unless last, but in Perl: \-quote |
1146 | $res .= $ic == length( $pat ) - 1 ? '$' : '\\$'; | |
8d063cd8 | 1147 | |
86a59229 WL |
1148 | } else { |
1149 | $res .= $c; | |
1150 | } | |
8d063cd8 | 1151 | } |
0a12ae7d | 1152 | |
86a59229 WL |
1153 | if( $parlev ){ |
1154 | Warn( "unmatched `\\('", $fl ); | |
1155 | return undef(); | |
8d063cd8 | 1156 | } |
0a12ae7d | 1157 | |
86a59229 WL |
1158 | # final cleanup: eliminate raw HTs |
1159 | $res =~ s/\t/\\t/g; | |
1160 | return $del . $res . ( $led ? $led : $del ); | |
1161 | } | |
0a12ae7d | 1162 | |
86a59229 WL |
1163 | |
1164 | ##### | |
1165 | # sub2p - convert sed substitution to Perl substitution | |
1166 | # | |
1167 | sub sub2p($$$){ | |
1168 | my( $del, $subst, $fl ) = @_; | |
1169 | my $led = $del; | |
1170 | $led =~ tr/{([</})]>/; | |
1171 | $led = '' if $led eq $del; | |
1172 | ||
1173 | $subst = substr( $subst, 1, length($subst) - 2 ); | |
1174 | my $res = ''; | |
1175 | ||
1176 | for( my $ic = 0; $ic < length( $subst ); $ic++ ){ | |
1177 | my $c = substr( $subst, $ic, 1 ); | |
1178 | if( $c eq '\\' ){ | |
1179 | ### backslash escapes | |
1180 | my $nc = peek($subst,$ic); | |
1181 | if( $nc eq '' ){ | |
1182 | Warn( "`\\' cannot be last in substitution", $fl ); | |
1183 | return undef(); | |
1184 | } | |
1185 | $ic++; | |
1186 | if( $nc =~ /[\\$del$led]/ ){ ## \ and delimiter | |
1187 | $res .= '\\' . $nc; | |
1188 | } elsif( $nc =~ /[1-9]/ ){ ## \1 - \9 => ${1} - ${9} | |
1189 | $res .= '${' . $nc . '}'; | |
1190 | } else { ## everything else (includes &): omit \ | |
1191 | $res .= $nc; | |
1192 | } | |
1193 | } elsif( $c eq '&' ){ ## & => $& | |
1194 | $res .= '$&'; | |
1195 | } elsif( $c =~ /[\$\@$led]/ ){ ## magic in Perl's substitution string | |
1196 | $res .= '\\' . $c; | |
1197 | } else { | |
1198 | $res .= $c; | |
8d063cd8 | 1199 | } |
8d063cd8 LW |
1200 | } |
1201 | ||
86a59229 WL |
1202 | # final cleanup: eliminate raw HTs |
1203 | $res =~ s/\t/\\t/g; | |
1204 | return ( $led ? $del : $led ) . $res . ( $led ? $led : $del ); | |
1205 | } | |
0a12ae7d | 1206 | |
86a59229 WL |
1207 | |
1208 | sub Parse(){ | |
1209 | my $error = 0; | |
1210 | my( $pdef, $pfil, $plin ); | |
1211 | for( my $icom = 0; $icom < @Commands; $icom++ ){ | |
1212 | my $cmd = $Commands[$icom]; | |
1213 | print "Parse:$cmd:\n" if $useDEBUG; | |
1214 | $cmd =~ s/^\s+//; | |
1215 | next unless length( $cmd ); | |
1216 | my $scom = $icom; | |
1217 | if( exists( $Defined{$icom} ) ){ | |
1218 | $pdef = $Defined{$icom}; | |
1219 | if( $pdef =~ /^ #(\d+)/ ){ | |
1220 | $pfil = 'expression #'; | |
1221 | $plin = $1; | |
1222 | } else { | |
1223 | $pfil = "$pdef l."; | |
1224 | $plin = 1; | |
1225 | } | |
1226 | } else { | |
1227 | $plin++; | |
1228 | } | |
1229 | my $fl = "$pfil$plin"; | |
1230 | ||
1231 | # insert command as comment in gnerated code | |
1232 | # | |
1233 | $Code .= "# $cmd\n" if $doGenerate; | |
1234 | ||
1235 | # The Address(es) | |
1236 | # | |
1237 | my( $negated, $naddr, $addr1, $addr2 ); | |
1238 | $naddr = 0; | |
1239 | if( $cmd =~ s/^(\d+)\s*// ){ | |
1240 | $addr1 = "$1"; $naddr++; | |
1241 | } elsif( $cmd =~ s/^\$\s*// ){ | |
1242 | $addr1 = 'eofARGV()'; $naddr++; | |
1243 | } elsif( $cmd =~ s{^(/)}{} || $cmd =~ s{^\\(.)}{} ){ | |
1244 | my $del = $1; | |
1245 | my $regex = stripRegex( $del, \$cmd ); | |
1246 | if( defined( $regex ) ){ | |
1247 | $addr1 = 'm '.bre2p( $del, $regex, $fl ).'s'; | |
1248 | $naddr++; | |
1249 | } else { | |
1250 | Warn( "malformed regex, 1st address", $fl ); | |
1251 | $error++; | |
1252 | next; | |
1253 | } | |
1254 | } | |
1255 | if( defined( $addr1 ) && $cmd =~ s/,\s*// ){ | |
1256 | if( $cmd =~ s/^(\d+)\s*// ){ | |
1257 | $addr2 = "$1"; $naddr++; | |
1258 | } elsif( $cmd =~ s/^\$\s*// ){ | |
1259 | $addr2 = 'eofARGV()'; $naddr++; | |
1260 | } elsif( $cmd =~ s{^(/)}{} || $cmd =~ s{^\\(.)}{} ){ | |
1261 | my $del = $1; | |
1262 | my $regex = stripRegex( $del, \$cmd ); | |
1263 | if( defined( $regex ) ){ | |
1264 | $addr2 = 'm '. bre2p( $del, $regex, $fl ).'s'; | |
1265 | $naddr++; | |
1266 | } else { | |
1267 | Warn( "malformed regex, 2nd address", $fl ); | |
1268 | $error++; | |
1269 | next; | |
1270 | } | |
1271 | } else { | |
1272 | Warn( "invalid address after `,'", $fl ); | |
1273 | $error++; | |
1274 | next; | |
1275 | } | |
1276 | } | |
1277 | ||
1278 | # address modifier `!' | |
1279 | # | |
1280 | $negated = $cmd =~ s/^!\s*//; | |
1281 | if( defined( $addr1 ) ){ | |
1282 | print "Parse: addr1=$addr1" if $useDEBUG; | |
1283 | if( defined( $addr2 ) ){ | |
1284 | print ", addr2=$addr2 " if $useDEBUG; | |
1285 | # both numeric and addr1 > addr2 => eliminate addr2 | |
1286 | undef( $addr2 ) if $addr1 =~ /^\d+$/ && | |
1287 | $addr2 =~ /^\d+$/ && $addr1 > $addr2; | |
1288 | } | |
9ef589d8 | 1289 | } |
86a59229 WL |
1290 | print 'negated' if $useDEBUG && $negated; |
1291 | print " command:$cmd\n" if $useDEBUG; | |
1292 | ||
1293 | # The Command | |
1294 | # | |
1295 | if( $cmd !~ s/^([:#={}abcdDgGhHilnNpPqrstwxy])\s*// ){ | |
1296 | my $h = substr( $cmd, 0, 1 ); | |
1297 | Warn( "unknown command `$h'", $fl ); | |
1298 | $error++; | |
8d063cd8 LW |
1299 | next; |
1300 | } | |
86a59229 | 1301 | my $key = $1; |
8d063cd8 | 1302 | |
86a59229 | 1303 | my $tabref = $ComTab{$key}; |
d16f50bd | 1304 | $GenKey{$key} = 1; |
86a59229 WL |
1305 | if( $naddr > $tabref->[0] ){ |
1306 | Warn( "excess address(es)", $fl ); | |
1307 | $error++; | |
8d063cd8 LW |
1308 | next; |
1309 | } | |
1310 | ||
86a59229 WL |
1311 | my $arg = ''; |
1312 | if( $tabref->[1] eq 'str' ){ | |
1313 | # take remainder - don't care if it is empty | |
1314 | $arg = $cmd; | |
1315 | $cmd = ''; | |
1316 | ||
1317 | } elsif( $tabref->[1] eq 'txt' ){ | |
1318 | # multi-line text | |
1319 | my $goon = $cmd =~ /(.*)\\$/; | |
1320 | if( length( $1 ) ){ | |
1321 | Warn( "extra characters after command ($cmd)", $fl ); | |
1322 | $error++; | |
8d063cd8 | 1323 | } |
86a59229 WL |
1324 | while( $goon ){ |
1325 | $icom++; | |
1326 | if( $icom > $#Commands ){ | |
1327 | Warn( "unexpected end of script", $fl ); | |
1328 | $error++; | |
1329 | last; | |
1330 | } | |
1331 | $cmd = $Commands[$icom]; | |
1332 | $Code .= "# $cmd\n" if $doGenerate; | |
1333 | $goon = $cmd =~ s/\\$//; | |
1334 | $cmd =~ s/\\(.)/$1/g; | |
1335 | $arg .= "\n" if length( $arg ); | |
1336 | $arg .= $cmd; | |
8d063cd8 | 1337 | } |
86a59229 WL |
1338 | $arg .= "\n" if length( $arg ); |
1339 | $cmd = ''; | |
8d063cd8 | 1340 | |
86a59229 WL |
1341 | } elsif( $tabref->[1] eq 'sub' ){ |
1342 | # s/// | |
1343 | if( ! length( $cmd ) ){ | |
1344 | Warn( "`s' command requires argument", $fl ); | |
1345 | $error++; | |
1346 | next; | |
1347 | } | |
1348 | if( $cmd =~ s{^([^\\\n])}{} ){ | |
1349 | my $del = $1; | |
1350 | my $regex = stripRegex( $del, \$cmd ); | |
1351 | if( ! defined( $regex ) ){ | |
1352 | Warn( "malformed regular expression", $fl ); | |
1353 | $error++; | |
1354 | next; | |
a687059c | 1355 | } |
86a59229 WL |
1356 | $regex = bre2p( $del, $regex, $fl ); |
1357 | ||
1358 | # a trailing \ indicates embedded NL (in replacement string) | |
1359 | while( $cmd =~ s/(?<!\\)\\$/\n/ ){ | |
1360 | $icom++; | |
1361 | if( $icom > $#Commands ){ | |
1362 | Warn( "unexpected end of script", $fl ); | |
1363 | $error++; | |
1364 | last; | |
8d063cd8 | 1365 | } |
86a59229 WL |
1366 | $cmd .= $Commands[$icom]; |
1367 | $Code .= "# $Commands[$icom]\n" if $doGenerate; | |
9ef589d8 | 1368 | } |
86a59229 WL |
1369 | |
1370 | my $subst = stripRegex( $del, \$cmd ); | |
1371 | if( ! defined( $regex ) ){ | |
1372 | Warn( "malformed substitution expression", $fl ); | |
1373 | $error++; | |
0a12ae7d LW |
1374 | next; |
1375 | } | |
86a59229 WL |
1376 | $subst = sub2p( $del, $subst, $fl ); |
1377 | ||
1378 | # parse s/// modifier: g|p|0-9|w <file> | |
1379 | my( $global, $nmatch, $print, $write ) = | |
1380 | ( '', '', 0, undef ); | |
1381 | while( $cmd =~ s/^([gp0-9])// ){ | |
1382 | $1 eq 'g' ? ( $global = 'g' ) : | |
1383 | $1 eq 'p' ? ( $print = $1 ) : ( $nmatch .= $1 ); | |
1384 | } | |
1385 | $write = $1 if $cmd =~ s/w\s*(.*)$//; | |
1386 | ### $nmatch =~ s/^(\d)\1*$/$1/; ### may be dangerous? | |
1387 | if( $global && length( $nmatch ) || length( $nmatch ) > 1 ){ | |
1388 | Warn( "conflicting flags `$global$nmatch'", $fl ); | |
1389 | $error++; | |
0a12ae7d LW |
1390 | next; |
1391 | } | |
86a59229 WL |
1392 | |
1393 | $arg = makes( $regex, $subst, | |
1394 | $write, $global, $print, $nmatch, $fl ); | |
1395 | if( ! defined( $arg ) ){ | |
1396 | $error++; | |
8d063cd8 LW |
1397 | next; |
1398 | } | |
86a59229 WL |
1399 | |
1400 | } else { | |
1401 | Warn( "improper delimiter in s command", $fl ); | |
1402 | $error++; | |
1403 | next; | |
1404 | } | |
1405 | ||
1406 | } elsif( $tabref->[1] eq 'tra' ){ | |
1407 | # y/// | |
1408 | # a trailing \ indicates embedded newline | |
1409 | while( $cmd =~ s/(?<!\\)\\$/\n/ ){ | |
1410 | $icom++; | |
1411 | if( $icom > $#Commands ){ | |
1412 | Warn( "unexpected end of script", $fl ); | |
1413 | $error++; | |
1414 | last; | |
1415 | } | |
1416 | $cmd .= $Commands[$icom]; | |
1417 | $Code .= "# $Commands[$icom]\n" if $doGenerate; | |
1418 | } | |
1419 | if( ! length( $cmd ) ){ | |
1420 | Warn( "`y' command requires argument", $fl ); | |
1421 | $error++; | |
1422 | next; | |
1423 | } | |
1424 | my $d = substr( $cmd, 0, 1 ); $cmd = substr( $cmd, 1 ); | |
1425 | if( $d eq '\\' ){ | |
1426 | Warn( "`\\' not valid as delimiter in `y' command", $fl ); | |
1427 | $error++; | |
1428 | next; | |
1429 | } | |
1430 | my $fr = stripTrans( $d, \$cmd ); | |
1431 | if( ! defined( $fr ) || ! length( $cmd ) ){ | |
1432 | Warn( "malformed `y' command argument", $fl ); | |
1433 | $error++; | |
1434 | next; | |
1435 | } | |
1436 | my $to = stripTrans( $d, \$cmd ); | |
1437 | if( ! defined( $to ) ){ | |
1438 | Warn( "malformed `y' command argument", $fl ); | |
1439 | $error++; | |
1440 | next; | |
1441 | } | |
1442 | if( length($fr) != length($to) ){ | |
1443 | Warn( "string lengths in `y' command differ", $fl ); | |
1444 | $error++; | |
1445 | next; | |
1446 | } | |
1447 | if( ! defined( $arg = makey( $fr, $to, $fl ) ) ){ | |
1448 | $error++; | |
1449 | next; | |
8d063cd8 | 1450 | } |
8d063cd8 | 1451 | |
8d063cd8 LW |
1452 | } |
1453 | ||
86a59229 WL |
1454 | # $cmd must be now empty - exception is { |
1455 | if( $cmd !~ /^\s*$/ ){ | |
1456 | if( $key eq '{' ){ | |
1457 | # dirty hack to process command on '{' line | |
1458 | $Commands[$icom--] = $cmd; | |
1459 | } else { | |
1460 | Warn( "extra characters after command ($cmd)", $fl ); | |
1461 | $error++; | |
1462 | next; | |
1463 | } | |
8d063cd8 LW |
1464 | } |
1465 | ||
86a59229 WL |
1466 | # Make Code |
1467 | # | |
1468 | if( &{$tabref->[2]}( $addr1, $addr2, $negated, | |
1469 | $tabref->[3], $arg, $fl ) ){ | |
1470 | $error++; | |
8d063cd8 | 1471 | } |
86a59229 | 1472 | } |
8d063cd8 | 1473 | |
86a59229 WL |
1474 | while( @BlockStack ){ |
1475 | my $bl = pop( @BlockStack ); | |
1476 | Warn( "start of unterminated `{'", $bl ); | |
1477 | $error++; | |
1478 | } | |
8d063cd8 | 1479 | |
86a59229 WL |
1480 | for my $lab ( keys( %Label ) ){ |
1481 | if( ! exists( $Label{$lab}{defined} ) ){ | |
1482 | for my $used ( @{$Label{$lab}{used}} ){ | |
1483 | Warn( "undefined label `$lab'", $used ); | |
1484 | $error++; | |
1485 | } | |
8d063cd8 | 1486 | } |
86a59229 | 1487 | } |
8d063cd8 | 1488 | |
86a59229 WL |
1489 | exit( 1 ) if $error; |
1490 | } | |
8d063cd8 | 1491 | |
8d063cd8 | 1492 | |
86a59229 WL |
1493 | ############## |
1494 | #### MAIN #### | |
1495 | ############## | |
8d063cd8 | 1496 | |
86a59229 WL |
1497 | sub usage(){ |
1498 | print STDERR "Usage: sed [-an] command [file...]\n"; | |
1499 | print STDERR " [-an] [-e command] [-f script-file] [file...]\n"; | |
1500 | } | |
8d063cd8 | 1501 | |
86a59229 WL |
1502 | ################### |
1503 | # Here we go again... | |
1504 | # | |
1505 | my $expr = 0; | |
1506 | while( @ARGV && $ARGV[0] =~ /^-(.)(.*)$/ ){ | |
1507 | my $opt = $1; | |
1508 | my $arg = $2; | |
1509 | shift( @ARGV ); | |
1510 | if( $opt eq 'e' ){ | |
1511 | if( length( $arg ) ){ | |
1512 | push( @Commands, split( "\n", $arg ) ); | |
1513 | } elsif( @ARGV ){ | |
1514 | push( @Commands, shift( @ARGV ) ); | |
1515 | } else { | |
1516 | Warn( "option -e requires an argument" ); | |
1517 | usage(); | |
1518 | exit( 1 ); | |
1519 | } | |
1520 | $expr++; | |
1521 | $Defined{$#Commands} = " #$expr"; | |
1522 | next; | |
1523 | } | |
1524 | if( $opt eq 'f' ){ | |
1525 | my $path; | |
1526 | if( length( $arg ) ){ | |
1527 | $path = $arg; | |
1528 | } elsif( @ARGV ){ | |
1529 | $path = shift( @ARGV ); | |
1530 | } else { | |
1531 | Warn( "option -f requires an argument" ); | |
1532 | usage(); | |
1533 | exit( 1 ); | |
1534 | } | |
1535 | my $fst = $#Commands + 1; | |
1536 | open( SCRIPT, "<$path" ) || die( "$0: $path: could not open ($!)\n" ); | |
1537 | my $cmd; | |
1538 | while( defined( $cmd = <SCRIPT> ) ){ | |
1539 | chomp( $cmd ); | |
1540 | push( @Commands, $cmd ); | |
1541 | } | |
1542 | close( SCRIPT ); | |
1543 | if( $#Commands >= $fst ){ | |
1544 | $Defined{$fst} = "$path"; | |
8d063cd8 | 1545 | } |
86a59229 WL |
1546 | next; |
1547 | } | |
1548 | if( $opt eq '-' && $arg eq '' ){ | |
1549 | last; | |
1550 | } | |
1551 | if( $opt eq 'h' || $opt eq '?' ){ | |
1552 | usage(); | |
1553 | exit( 0 ); | |
1554 | } | |
1555 | if( $opt eq 'n' ){ | |
1556 | $doAutoPrint = 0; | |
1557 | } elsif( $opt eq 'a' ){ | |
1558 | $doOpenWrite = 0; | |
1559 | } else { | |
1560 | Warn( "illegal option `$opt'" ); | |
1561 | usage(); | |
1562 | exit( 1 ); | |
1563 | } | |
1564 | if( length( $arg ) ){ | |
1565 | unshift( @ARGV, "-$arg" ); | |
1566 | } | |
1567 | } | |
8d063cd8 | 1568 | |
86a59229 WL |
1569 | # A singleton command may be the 1st argument when there are no options. |
1570 | # | |
1571 | if( @Commands == 0 ){ | |
1572 | if( @ARGV == 0 ){ | |
1573 | Warn( "no script command given" ); | |
1574 | usage(); | |
1575 | exit( 1 ); | |
1576 | } | |
1577 | push( @Commands, split( "\n", shift( @ARGV ) ) ); | |
1578 | $Defined{0} = ' #1'; | |
1579 | } | |
8d063cd8 | 1580 | |
86a59229 | 1581 | print STDERR "Files: @ARGV\n" if $useDEBUG; |
8d063cd8 | 1582 | |
86a59229 WL |
1583 | # generate leading code |
1584 | # | |
d16f50bd | 1585 | $Func = <<'[TheEnd]'; |
86a59229 | 1586 | |
d16f50bd WL |
1587 | # openARGV: open 1st input file |
1588 | # | |
86a59229 WL |
1589 | sub openARGV(){ |
1590 | unshift( @ARGV, '-' ) unless @ARGV; | |
1591 | my $file = shift( @ARGV ); | |
1592 | open( ARG, "<$file" ) | |
1593 | || die( "$0: can't open $file for reading ($!)\n" ); | |
1594 | $isEOF = 0; | |
1595 | } | |
8d063cd8 | 1596 | |
d16f50bd WL |
1597 | # getsARGV: Read another input line into argument (default: $_). |
1598 | # Move on to next input file, and reset EOF flag $isEOF. | |
86a59229 WL |
1599 | sub getsARGV(;\$){ |
1600 | my $argref = @_ ? shift() : \$_; | |
1601 | while( $isEOF || ! defined( $$argref = <ARG> ) ){ | |
1602 | close( ARG ); | |
1603 | return 0 unless @ARGV; | |
1604 | my $file = shift( @ARGV ); | |
1605 | open( ARG, "<$file" ) | |
1606 | || die( "$0: can't open $file for reading ($!)\n" ); | |
1607 | $isEOF = 0; | |
1608 | } | |
1609 | 1; | |
1610 | } | |
8d063cd8 | 1611 | |
d16f50bd WL |
1612 | # eofARGV: end-of-file test |
1613 | # | |
86a59229 WL |
1614 | sub eofARGV(){ |
1615 | return @ARGV == 0 && ( $isEOF = eof( ARG ) ); | |
1616 | } | |
8d063cd8 | 1617 | |
d16f50bd WL |
1618 | # makeHandle: Generates another file handle for some file (given by its path) |
1619 | # to be written due to a w command or an s command's w flag. | |
86a59229 WL |
1620 | sub makeHandle($){ |
1621 | my( $path ) = @_; | |
1622 | my $handle; | |
1623 | if( ! exists( $wFiles{$path} ) || $wFiles{$path} eq '' ){ | |
1624 | $handle = $wFiles{$path} = gensym(); | |
1625 | if( $doOpenWrite ){ | |
1626 | if( ! open( $handle, ">$path" ) ){ | |
1627 | die( "$0: can't open $path for writing: ($!)\n" ); | |
1628 | } | |
9ef589d8 | 1629 | } |
86a59229 WL |
1630 | } else { |
1631 | $handle = $wFiles{$path}; | |
1632 | } | |
1633 | return $handle; | |
1634 | } | |
9ef589d8 | 1635 | |
d16f50bd WL |
1636 | # printQ: Print queued output which is either a string or a reference |
1637 | # to a pathname. | |
86a59229 WL |
1638 | sub printQ(){ |
1639 | for my $q ( @Q ){ | |
1640 | if( ref( $q ) ){ | |
d16f50bd | 1641 | # flush open w files so that reading this file gets it all |
86a59229 WL |
1642 | if( exists( $wFiles{$$q} ) && $wFiles{$$q} ne '' ){ |
1643 | open( $wFiles{$$q}, ">>$$q" ); | |
1644 | } | |
d16f50bd | 1645 | # copy file to stdout: slow, but safe |
86a59229 | 1646 | if( open( RF, "<$$q" ) ){ |
d16f50bd | 1647 | while( defined( my $line = <RF> ) ){ |
86a59229 WL |
1648 | print $line; |
1649 | } | |
1650 | close( RF ); | |
1651 | } | |
1652 | } else { | |
1653 | print $q; | |
a687059c | 1654 | } |
86a59229 WL |
1655 | } |
1656 | undef( @Q ); | |
1657 | } | |
1658 | ||
d16f50bd WL |
1659 | [TheEnd] |
1660 | ||
1661 | # generate the sed loop | |
1662 | # | |
1663 | $Code .= <<'[TheEnd]'; | |
1664 | sub openARGV(); | |
1665 | sub getsARGV(;\$); | |
1666 | sub eofARGV(); | |
1667 | sub printQ(); | |
1668 | ||
1669 | # Run: the sed loop reading input and applying the script | |
1670 | # | |
86a59229 WL |
1671 | sub Run(){ |
1672 | my( $h, $icnt, $s, $n ); | |
1673 | # hack (not unbreakable :-/) to avoid // matching an empty string | |
1674 | my $z = "\000"; $z =~ /$z/; | |
1675 | # Initialize. | |
1676 | openARGV(); | |
1677 | $Hold = ''; | |
1678 | $CondReg = 0; | |
1679 | $doPrint = $doAutoPrint; | |
1680 | CYCLE: | |
1681 | while( getsARGV() ){ | |
1682 | chomp(); | |
1683 | $CondReg = 0; # cleared on t | |
1684 | BOS:; | |
1685 | [TheEnd] | |
1686 | ||
1687 | # parse - avoid opening files when doing s2p | |
1688 | # | |
1689 | ( $svOpenWrite, $doOpenWrite ) = ( $doOpenWrite, $svOpenWrite ) | |
1690 | if $doGenerate; | |
1691 | Parse(); | |
1692 | ( $svOpenWrite, $doOpenWrite ) = ( $doOpenWrite, $svOpenWrite ) | |
1693 | if $doGenerate; | |
1694 | ||
1695 | # append trailing code | |
1696 | # | |
1697 | $Code .= <<'[TheEnd]'; | |
1698 | EOS: if( $doPrint ){ | |
1699 | print $_, "\n"; | |
1700 | } else { | |
1701 | $doPrint = $doAutoPrint; | |
a687059c | 1702 | } |
86a59229 | 1703 | printQ() if @Q; |
a687059c | 1704 | } |
86a59229 WL |
1705 | |
1706 | exit( 0 ); | |
a687059c | 1707 | } |
86a59229 WL |
1708 | [TheEnd] |
1709 | ||
d16f50bd WL |
1710 | |
1711 | # append optional functions, prepend prototypes | |
1712 | # | |
1713 | my $Proto = "# prototypes\n"; | |
1714 | if( $GenKey{'l'} ){ | |
1715 | $Proto .= "sub _l();\n"; | |
1716 | $Func .= <<'[TheEnd]'; | |
1717 | # _l: l command processing | |
1718 | # | |
1719 | sub _l(){ | |
1720 | my $h = $_; | |
1721 | my $mcpl = 70; | |
1722 | # transform non printing chars into escape notation | |
1723 | $h =~ s/\\/\\\\/g; | |
1724 | if( $h =~ /[^[:print:]]/ ){ | |
1725 | $h =~ s/\a/\\a/g; | |
1726 | $h =~ s/\f/\\f/g; | |
1727 | $h =~ s/\n/\\n/g; | |
1728 | $h =~ s/\t/\\t/g; | |
1729 | $h =~ s/\r/\\r/g; | |
1730 | $h =~ s/\e/\\e/g; | |
1731 | $h =~ s/([^[:print:]])/sprintf("\\%03o", ord($1))/ge; | |
1732 | } | |
1733 | # split into lines of length $mcpl | |
1734 | while( length( $h ) > $mcpl ){ | |
1735 | my $l = substr( $h, 0, $mcpl-1 ); | |
1736 | $h = substr( $h, $mcpl ); | |
1737 | # remove incomplete \-escape from end of line | |
1738 | if( $l =~ s/(?<!\\)(\\[0-7]{0,2})$// ){ | |
1739 | $h = $1 . $h; | |
1740 | } | |
1741 | print $l, "\\\n"; | |
1742 | } | |
1743 | print "$h\$\n"; | |
1744 | } | |
1745 | ||
1746 | [TheEnd] | |
1747 | } | |
1748 | ||
1749 | if( $GenKey{'r'} ){ | |
1750 | $Proto .= "sub _r(\$);\n"; | |
1751 | $Func .= <<'[TheEnd]'; | |
1752 | # _r: r command processing: Save a reference to the pathname. | |
1753 | # | |
1754 | sub _r($){ | |
1755 | my $path = shift(); | |
1756 | push( @Q, \$path ); | |
1757 | } | |
1758 | ||
1759 | [TheEnd] | |
1760 | } | |
1761 | ||
1762 | if( $GenKey{'t'} ){ | |
1763 | $Proto .= "sub _t();\n"; | |
1764 | $Func .= <<'[TheEnd]'; | |
1765 | # _t: t command - condition register test/reset | |
1766 | # | |
1767 | sub _t(){ | |
1768 | my $res = $CondReg; | |
1769 | $CondReg = 0; | |
1770 | $res; | |
1771 | } | |
1772 | ||
1773 | [TheEnd] | |
1774 | } | |
1775 | ||
1776 | if( $GenKey{'w'} ){ | |
1777 | $Proto .= "sub _w(\$);\n"; | |
1778 | $Func .= <<'[TheEnd]'; | |
1779 | # _w: w command and s command's w flag - write to file | |
1780 | # | |
1781 | sub _w($){ | |
1782 | my $path = shift(); | |
1783 | my $handle = $wFiles{$path}; | |
1784 | if( ! $doOpenWrite && ! defined( fileno( $handle ) ) ){ | |
1785 | open( $handle, ">$path" ) | |
1786 | || die( "$0: $path: cannot open ($!)\n" ); | |
1787 | } | |
1788 | print $handle $_, "\n"; | |
1789 | } | |
1790 | ||
1791 | [TheEnd] | |
1792 | } | |
1793 | ||
1794 | $Code = $Proto . $Code; | |
1795 | ||
86a59229 WL |
1796 | # magic "#n" - same as -n option |
1797 | # | |
1798 | $doAutoPrint = 0 if substr( $Commands[0], 0, 2 ) eq '#n'; | |
a687059c | 1799 | |
86a59229 WL |
1800 | # eval code - check for errors |
1801 | # | |
d16f50bd WL |
1802 | print "Code:\n$Code$Func" if $useDEBUG; |
1803 | eval $Code . $Func; | |
86a59229 | 1804 | if( $@ ){ |
d16f50bd | 1805 | print "Code:\n$Code$Func"; |
86a59229 | 1806 | die( "$0: internal error - generated incorrect Perl code: $@\n" ); |
9ef589d8 LW |
1807 | } |
1808 | ||
86a59229 WL |
1809 | if( $doGenerate ){ |
1810 | ||
1811 | # write full Perl program | |
1812 | # | |
1813 | ||
d16f50bd | 1814 | # bang line, declarations, prototypes |
86a59229 WL |
1815 | print <<TheEnd; |
1816 | #!$perlpath -w | |
1817 | eval 'exec $perlpath -S \$0 \${1+"\$@"}' | |
1818 | if 0; | |
9ae2b9a0 | 1819 | \$0 =~ s/^.*?(\\w+)\[\\.\\w+\]*\$/\$1/; |
86a59229 WL |
1820 | |
1821 | use strict; | |
1822 | use Symbol; | |
1823 | use vars qw{ \$isEOF \$Hold \%wFiles \@Q \$CondReg | |
1824 | \$doAutoPrint \$doOpenWrite \$doPrint }; | |
1825 | \$doAutoPrint = $doAutoPrint; | |
1826 | \$doOpenWrite = $doOpenWrite; | |
1827 | TheEnd | |
1828 | ||
1829 | my $wf = "'" . join( "', '", keys( %wFiles ) ) . "'"; | |
1830 | if( $wf ne "''" ){ | |
1831 | print <<TheEnd; | |
1832 | sub makeHandle(\$); | |
1833 | for my \$p ( $wf ){ | |
1834 | exit( 1 ) unless makeHandle( \$p ); | |
9ef589d8 | 1835 | } |
86a59229 WL |
1836 | TheEnd |
1837 | } | |
9ef589d8 | 1838 | |
86a59229 | 1839 | print $Code; |
d16f50bd WL |
1840 | print "Run();\n"; |
1841 | print $Func; | |
86a59229 | 1842 | exit( 0 ); |
1aa91729 | 1843 | |
86a59229 WL |
1844 | } else { |
1845 | ||
1846 | # execute: make handles (and optionally open) all w files; run! | |
86a59229 WL |
1847 | for my $p ( keys( %wFiles ) ){ |
1848 | exit( 1 ) unless makeHandle( $p ); | |
1849 | } | |
d16f50bd | 1850 | Run(); |
1aa91729 | 1851 | } |
86a59229 WL |
1852 | |
1853 | ||
1854 | =head1 ENVIRONMENT | |
1855 | ||
1856 | The environment variable C<PSEDEXTBRE> may be set to extend BREs. | |
1857 | See L<"Additional Atoms">. | |
1858 | ||
1859 | =head1 DIAGNOSTICS | |
1860 | ||
1861 | =over 4 | |
1862 | ||
3484938b | 1863 | =item ambiguous translation for character `%s' in `y' command |
86a59229 WL |
1864 | |
1865 | The indicated character appears twice, with different translations. | |
1866 | ||
1867 | =item `[' cannot be last in pattern | |
1868 | ||
1869 | A `[' in a BRE indicates the beginning of a I<bracket expression>. | |
1870 | ||
1871 | =item `\' cannot be last in pattern | |
1872 | ||
1873 | A `\' in a BRE is used to make the subsequent character literal. | |
1874 | ||
1875 | =item `\' cannot be last in substitution | |
1876 | ||
1877 | A `\' in a subsitution string is used to make the subsequent character literal. | |
1878 | ||
1879 | =item conflicting flags `%s' | |
1880 | ||
1881 | In an B<s> command, either the `g' flag and an n-th occurrence flag, or | |
1882 | multiple n-th occurrence flags are specified. Note that only the digits | |
1883 | `1' through `9' are permitted. | |
1884 | ||
1885 | =item duplicate label %s (first defined at %s) | |
1886 | ||
1887 | =item excess address(es) | |
1888 | ||
1889 | The command has more than the permitted number of addresses. | |
1890 | ||
1891 | =item extra characters after command (%s) | |
1892 | ||
1893 | =item illegal option `%s' | |
1894 | ||
1895 | =item improper delimiter in s command | |
1896 | ||
1897 | The BRE and substitution may not be delimited with `\' or newline. | |
1898 | ||
1899 | =item invalid address after `,' | |
1900 | ||
1901 | =item invalid backreference (%s) | |
1902 | ||
1903 | The specified backreference number exceeds the number of backreferences | |
1904 | in the BRE. | |
1905 | ||
1906 | =item invalid repeat clause `\{%s\}' | |
1907 | ||
1908 | The repeat clause does not contain a valid integer value, or pair of | |
1909 | values. | |
1910 | ||
1911 | =item malformed regex, 1st address | |
1912 | ||
1913 | =item malformed regex, 2nd address | |
1914 | ||
1915 | =item malformed regular expression | |
1916 | ||
1917 | =item malformed substitution expression | |
1918 | ||
1919 | =item malformed `y' command argument | |
1920 | ||
1921 | The first or second string of a B<y> command is syntactically incorrect. | |
1922 | ||
1923 | =item maximum less than minimum in `\{%s\}' | |
1924 | ||
1925 | =item no script command given | |
1926 | ||
1927 | There must be at least one B<-e> or one B<-f> option specifying a | |
1928 | script or script file. | |
1929 | ||
1930 | =item `\' not valid as delimiter in `y' command | |
1931 | ||
1932 | =item option -e requires an argument | |
1933 | ||
1934 | =item option -f requires an argument | |
1935 | ||
1936 | =item `s' command requires argument | |
1937 | ||
1938 | =item start of unterminated `{' | |
1939 | ||
1940 | =item string lengths in `y' command differ | |
1941 | ||
1942 | The translation table strings in a B<y> commanf must have equal lengths. | |
1943 | ||
1944 | =item undefined label `%s' | |
1945 | ||
1946 | =item unexpected `}' | |
1947 | ||
1948 | A B<}> command without a preceding B<{> command was encountered. | |
1949 | ||
1950 | =item unexpected end of script | |
1951 | ||
1952 | The end of the script was reached although a text line after a | |
1953 | B<a>, B<c> or B<i> command indicated another line. | |
1954 | ||
1955 | =item unknown command `%s' | |
1956 | ||
1957 | =item unterminated `[' | |
1958 | ||
1959 | A BRE contains an unterminated bracket expression. | |
1960 | ||
1961 | =item unterminated `\(' | |
1962 | ||
1963 | A BRE contains an unterminated backreference. | |
1964 | ||
1965 | =item `\{' without closing `\}' | |
1966 | ||
1967 | A BRE contains an unterminated bounds specification. | |
1968 | ||
1969 | =item `\)' without preceding `\(' | |
1970 | ||
1971 | =item `y' command requires argument | |
1972 | ||
1973 | =back | |
1974 | ||
1975 | =head1 EXAMPLE | |
1976 | ||
1977 | The basic material for the preceding section was generated by running | |
1978 | the sed script | |
1979 | ||
1980 | #no autoprint | |
1981 | s/^.*Warn( *"\([^"]*\)".*$/\1/ | |
1982 | t process | |
1983 | b | |
1984 | :process | |
1985 | s/$!/%s/g | |
1986 | s/$[_[:alnum:]]\{1,\}/%s/g | |
1987 | s/\\\\/\\/g | |
1988 | s/^/=item / | |
1989 | p | |
1990 | ||
1991 | on the program's own text, and piping the output into C<sort -u>. | |
1992 | ||
1993 | ||
1994 | =head1 SED SCRIPT TRANSLATION | |
1995 | ||
1996 | If this program is invoked with the name F<s2p> it will act as a | |
1997 | sed-to-Perl translator. After option processing (all other | |
1998 | arguments are ignored), a Perl program is printed on standard | |
1999 | output, which will process the input stream (as read from all | |
2000 | arguments) in the way defined by the sed script and the option setting | |
2001 | used for the translation. | |
2002 | ||
2003 | =head1 SEE ALSO | |
2004 | ||
2005 | perl(1), re_format(7) | |
2006 | ||
2007 | =head1 BUGS | |
2008 | ||
2009 | The B<l> command will show escape characters (ESC) as `C<\e>', but | |
2010 | a vertical tab (VT) in octal. | |
2011 | ||
2012 | Trailing spaces are truncated from labels in B<:>, B<t> and B<b> commands. | |
2013 | ||
2014 | The meaning of an empty regular expression (`C<//>'), as defined by B<sed>, | |
2015 | is "the last pattern used, at run time". This deviates from the Perl | |
2016 | interpretation, which will re-use the "last last successfully executed | |
2017 | regular expression". Since keeping track of pattern usage would create | |
2018 | terribly cluttered code, and differences would only appear in obscure | |
2019 | context (where other B<sed> implementations appear to deviate, too), | |
2020 | the Perl semantics was adopted. Note that common usage of this feature, | |
2021 | such as in C</abc/s//xyz/>, will work as expected. | |
2022 | ||
2023 | Collating elements (of bracket expressions in BREs) are not implemented. | |
2024 | ||
2025 | =head1 STANDARDS | |
2026 | ||
2027 | This B<sed> implementation conforms to the IEEE Std1003.2-1992 ("POSIX.2") | |
2028 | definition of B<sed>, and is compatible with the I<OpenBSD> | |
2029 | implementation, except where otherwise noted (see L<"BUGS">). | |
2030 | ||
2031 | =head1 AUTHOR | |
2032 | ||
2033 | This Perl implementation of I<sed> was written by Wolfgang Laun, | |
2034 | I<Wolfgang.Laun@alcatel.at>. | |
2035 | ||
2036 | =head1 COPYRIGHT and LICENSE | |
2037 | ||
2038 | This program is free and open software. You may use, modify, | |
2039 | distribute, and sell this program (and any modified variants) in any | |
2040 | way you wish, provided you do not restrict others from doing the same. | |
2041 | ||
2042 | =cut | |
2043 | ||
a687059c | 2044 | !NO!SUBS! |
4633a7c4 LW |
2045 | |
2046 | close OUT or die "Can't close $file: $!"; | |
2047 | chmod 0755, $file or die "Can't reset permissions for $file: $!\n"; | |
d38b618a A |
2048 | unlink 'psed'; |
2049 | print "Linking s2p to psed.\n"; | |
2050 | if (defined $Config{d_link}) { | |
2051 | link 's2p', 'psed'; | |
2052 | } else { | |
2053 | unshift @INC, '../lib'; | |
2054 | require File::Copy; | |
2055 | File::Copy::syscopy('s2p', 'psed'); | |
2056 | } | |
4633a7c4 | 2057 | exec("$Config{'eunicefix'} $file") if $Config{'eunicefix'} ne ':'; |
8a5546a1 | 2058 | chdir $origdir; |