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920dae64 AT |
1 | #!/import/archperf/ws/devtools/4/amd64/bin/perl |
2 | eval 'exec /import/archperf/ws/devtools/4/amd64/bin/perl -S $0 ${1+"$@"}' | |
3 | if $running_under_some_shell; | |
4 | my $startperl; | |
5 | my $perlpath; | |
6 | ($startperl = <<'/../') =~ s/\s*\z//; | |
7 | #!/import/archperf/ws/devtools/4/amd64/bin/perl | |
8 | /../ | |
9 | ($perlpath = <<'/../') =~ s/\s*\z//; | |
10 | /import/archperf/ws/devtools/4/amd64/bin/perl | |
11 | /../ | |
12 | ||
13 | $0 =~ s/^.*?(\w+)[\.\w]*$/$1/; | |
14 | ||
15 | # (p)sed - a stream editor | |
16 | # History: Aug 12 2000: Original version. | |
17 | # Mar 25 2002: Rearrange generated Perl program. | |
18 | ||
19 | use strict; | |
20 | use integer; | |
21 | use Symbol; | |
22 | ||
23 | =head1 NAME | |
24 | ||
25 | psed - a stream editor | |
26 | ||
27 | =head1 SYNOPSIS | |
28 | ||
29 | psed [-an] script [file ...] | |
30 | psed [-an] [-e script] [-f script-file] [file ...] | |
31 | ||
32 | s2p [-an] [-e script] [-f script-file] | |
33 | ||
34 | =head1 DESCRIPTION | |
35 | ||
36 | A stream editor reads the input stream consisting of the specified files | |
37 | (or standard input, if none are given), processes is line by line by | |
38 | applying a script consisting of edit commands, and writes resulting lines | |
39 | to standard output. The filename `C<->' may be used to read standard input. | |
40 | ||
41 | The edit script is composed from arguments of B<-e> options and | |
42 | script-files, in the given order. A single script argument may be specified | |
43 | as the first parameter. | |
44 | ||
45 | If this program is invoked with the name F<s2p>, it will act as a | |
46 | sed-to-Perl translator. See L<"sed Script Translation">. | |
47 | ||
48 | B<sed> returns an exit code of 0 on success or >0 if an error occurred. | |
49 | ||
50 | =head1 OPTIONS | |
51 | ||
52 | =over 4 | |
53 | ||
54 | =item B<-a> | |
55 | ||
56 | A file specified as argument to the B<w> edit command is by default | |
57 | opened before input processing starts. Using B<-a>, opening of such | |
58 | files is delayed until the first line is actually written to the file. | |
59 | ||
60 | =item B<-e> I<script> | |
61 | ||
62 | The editing commands defined by I<script> are appended to the script. | |
63 | Multiple commands must be separated by newlines. | |
64 | ||
65 | =item B<-f> I<script-file> | |
66 | ||
67 | Editing commands from the specified I<script-file> are read and appended | |
68 | to the script. | |
69 | ||
70 | =item B<-n> | |
71 | ||
72 | By default, a line is written to standard output after the editing script | |
73 | has been applied to it. The B<-n> option suppresses automatic printing. | |
74 | ||
75 | =back | |
76 | ||
77 | =head1 COMMANDS | |
78 | ||
79 | B<sed> command syntax is defined as | |
80 | ||
81 | Z<> Z<> Z<> Z<>[I<address>[B<,>I<address>]][B<!>]I<function>[I<argument>] | |
82 | ||
83 | with whitespace being permitted before or after addresses, and between | |
84 | the function character and the argument. The I<address>es and the | |
85 | address inverter (C<!>) are used to restrict the application of a | |
86 | command to the selected line(s) of input. | |
87 | ||
88 | Each command must be on a line of its own, except where noted in | |
89 | the synopses below. | |
90 | ||
91 | The edit cycle performed on each input line consist of reading the line | |
92 | (without its trailing newline character) into the I<pattern space>, | |
93 | applying the applicable commands of the edit script, writing the final | |
94 | contents of the pattern space and a newline to the standard output. | |
95 | A I<hold space> is provided for saving the contents of the | |
96 | pattern space for later use. | |
97 | ||
98 | =head2 Addresses | |
99 | ||
100 | A sed address is either a line number or a pattern, which may be combined | |
101 | arbitrarily to construct ranges. Lines are numbered across all input files. | |
102 | ||
103 | Any address may be followed by an exclamation mark (`C<!>'), selecting | |
104 | all lines not matching that address. | |
105 | ||
106 | =over 4 | |
107 | ||
108 | =item I<number> | |
109 | ||
110 | The line with the given number is selected. | |
111 | ||
112 | =item B<$> | |
113 | ||
114 | A dollar sign (C<$>) is the line number of the last line of the input stream. | |
115 | ||
116 | =item B</>I<regular expression>B</> | |
117 | ||
118 | A pattern address is a basic regular expression (see | |
119 | L<"Basic Regular Expressions">), between the delimiting character C</>. | |
120 | Any other character except C<\> or newline may be used to delimit a | |
121 | pattern address when the initial delimiter is prefixed with a | |
122 | backslash (`C<\>'). | |
123 | ||
124 | =back | |
125 | ||
126 | If no address is given, the command selects every line. | |
127 | ||
128 | If one address is given, it selects the line (or lines) matching the | |
129 | address. | |
130 | ||
131 | Two addresses select a range that begins whenever the first address | |
132 | matches, and ends (including that line) when the second address matches. | |
133 | If the first (second) address is a matching pattern, the second | |
134 | address is not applied to the very same line to determine the end of | |
135 | the range. Likewise, if the second address is a matching pattern, the | |
136 | first address is not applied to the very same line to determine the | |
137 | begin of another range. If both addresses are line numbers, | |
138 | and the second line number is less than the first line number, then | |
139 | only the first line is selected. | |
140 | ||
141 | ||
142 | =head2 Functions | |
143 | ||
144 | The maximum permitted number of addresses is indicated with each | |
145 | function synopsis below. | |
146 | ||
147 | The argument I<text> consists of one or more lines following the command. | |
148 | Embedded newlines in I<text> must be preceded with a backslash. Other | |
149 | backslashes in I<text> are deleted and the following character is taken | |
150 | literally. | |
151 | ||
152 | =over 4 | |
153 | ||
154 | =cut | |
155 | ||
156 | my %ComTab; | |
157 | my %GenKey; | |
158 | #-------------------------------------------------------------------------- | |
159 | $ComTab{'a'}=[ 1, 'txt', \&Emit, '{ push( @Q, <<'."'TheEnd' ) }\n" ]; #ok | |
160 | ||
161 | =item [1addr]B<a\> I<text> | |
162 | ||
163 | Write I<text> (which must start on the line following the command) | |
164 | to standard output immediately before reading the next line | |
165 | of input, either by executing the B<N> function or by beginning a new cycle. | |
166 | ||
167 | =cut | |
168 | ||
169 | #-------------------------------------------------------------------------- | |
170 | $ComTab{'b'}=[ 2, 'str', \&Branch, '{ goto XXX; }' ]; #ok | |
171 | ||
172 | =item [2addr]B<b> [I<label>] | |
173 | ||
174 | Branch to the B<:> function with the specified I<label>. If no label | |
175 | is given, branch to the end of the script. | |
176 | ||
177 | =cut | |
178 | ||
179 | #-------------------------------------------------------------------------- | |
180 | $ComTab{'c'}=[ 2, 'txt', \&Change, <<'-X-' ]; #ok | |
181 | { print <<'TheEnd'; } $doPrint = 0; goto EOS; | |
182 | -X- | |
183 | ### continue OK => next CYCLE; | |
184 | ||
185 | =item [2addr]B<c\> I<text> | |
186 | ||
187 | The line, or range of lines, selected by the address is deleted. | |
188 | The I<text> (which must start on the line following the command) | |
189 | is written to standard output. With an address range, this occurs at | |
190 | the end of the range. | |
191 | ||
192 | =cut | |
193 | ||
194 | #-------------------------------------------------------------------------- | |
195 | $ComTab{'d'}=[ 2, '', \&Emit, <<'-X-' ]; #ok | |
196 | { $doPrint = 0; | |
197 | goto EOS; | |
198 | } | |
199 | -X- | |
200 | ### continue OK => next CYCLE; | |
201 | ||
202 | =item [2addr]B<d> | |
203 | ||
204 | Deletes the pattern space and starts the next cycle. | |
205 | ||
206 | =cut | |
207 | ||
208 | #-------------------------------------------------------------------------- | |
209 | $ComTab{'D'}=[ 2, '', \&Emit, <<'-X-' ]; #ok | |
210 | { s/^.*\n?//; | |
211 | if(length($_)){ goto BOS } else { goto EOS } | |
212 | } | |
213 | -X- | |
214 | ### continue OK => next CYCLE; | |
215 | ||
216 | =item [2addr]B<D> | |
217 | ||
218 | Deletes the pattern space through the first embedded newline or to the end. | |
219 | If the pattern space becomes empty, a new cycle is started, otherwise | |
220 | execution of the script is restarted. | |
221 | ||
222 | =cut | |
223 | ||
224 | #-------------------------------------------------------------------------- | |
225 | $ComTab{'g'}=[ 2, '', \&Emit, '{ $_ = $Hold };' ]; #ok | |
226 | ||
227 | =item [2addr]B<g> | |
228 | ||
229 | Replace the contents of the pattern space with the hold space. | |
230 | ||
231 | =cut | |
232 | ||
233 | #-------------------------------------------------------------------------- | |
234 | $ComTab{'G'}=[ 2, '', \&Emit, '{ $_ .= "\n"; $_ .= $Hold };' ]; #ok | |
235 | ||
236 | =item [2addr]B<G> | |
237 | ||
238 | Append a newline and the contents of the hold space to the pattern space. | |
239 | ||
240 | =cut | |
241 | ||
242 | #-------------------------------------------------------------------------- | |
243 | $ComTab{'h'}=[ 2, '', \&Emit, '{ $Hold = $_ }' ]; #ok | |
244 | ||
245 | =item [2addr]B<h> | |
246 | ||
247 | Replace the contents of the hold space with the pattern space. | |
248 | ||
249 | =cut | |
250 | ||
251 | #-------------------------------------------------------------------------- | |
252 | $ComTab{'H'}=[ 2, '', \&Emit, '{ $Hold .= "\n"; $Hold .= $_; }' ]; #ok | |
253 | ||
254 | =item [2addr]B<H> | |
255 | ||
256 | Append a newline and the contents of the pattern space to the hold space. | |
257 | ||
258 | =cut | |
259 | ||
260 | #-------------------------------------------------------------------------- | |
261 | $ComTab{'i'}=[ 1, 'txt', \&Emit, '{ print <<'."'TheEnd' }\n" ]; #ok | |
262 | ||
263 | =item [1addr]B<i\> I<text> | |
264 | ||
265 | Write the I<text> (which must start on the line following the command) | |
266 | to standard output. | |
267 | ||
268 | =cut | |
269 | ||
270 | #-------------------------------------------------------------------------- | |
271 | $ComTab{'l'}=[ 2, '', \&Emit, '{ _l() }' ]; #okUTF8 | |
272 | ||
273 | =item [2addr]B<l> | |
274 | ||
275 | Print the contents of the pattern space: non-printable characters are | |
276 | shown in C-style escaped form; long lines are split and have a trailing | |
277 | `C<\>' at the point of the split; the true end of a line is marked with | |
278 | a `C<$>'. Escapes are: `\a', `\t', `\n', `\f', `\r', `\e' for | |
279 | BEL, HT, LF, FF, CR, ESC, respectively, and `\' followed by a three-digit | |
280 | octal number for all other non-printable characters. | |
281 | ||
282 | =cut | |
283 | ||
284 | #-------------------------------------------------------------------------- | |
285 | $ComTab{'n'}=[ 2, '', \&Emit, <<'-X-' ]; #ok | |
286 | { print $_, "\n" if $doPrint; | |
287 | printQ() if @Q; | |
288 | $CondReg = 0; | |
289 | last CYCLE unless getsARGV(); | |
290 | chomp(); | |
291 | } | |
292 | -X- | |
293 | ||
294 | =item [2addr]B<n> | |
295 | ||
296 | If automatic printing is enabled, write the pattern space to the standard | |
297 | output. Replace the pattern space with the next line of input. If | |
298 | there is no more input, processing is terminated. | |
299 | ||
300 | =cut | |
301 | ||
302 | #-------------------------------------------------------------------------- | |
303 | $ComTab{'N'}=[ 2, '', \&Emit, <<'-X-' ]; #ok | |
304 | { printQ() if @Q; | |
305 | $CondReg = 0; | |
306 | last CYCLE unless getsARGV( $h ); | |
307 | chomp( $h ); | |
308 | $_ .= "\n$h"; | |
309 | } | |
310 | -X- | |
311 | ||
312 | =item [2addr]B<N> | |
313 | ||
314 | Append a newline and the next line of input to the pattern space. If | |
315 | there is no more input, processing is terminated. | |
316 | ||
317 | =cut | |
318 | ||
319 | #-------------------------------------------------------------------------- | |
320 | $ComTab{'p'}=[ 2, '', \&Emit, '{ print $_, "\n"; }' ]; #ok | |
321 | ||
322 | =item [2addr]B<p> | |
323 | ||
324 | Print the pattern space to the standard output. (Use the B<-n> option | |
325 | to suppress automatic printing at the end of a cycle if you want to | |
326 | avoid double printing of lines.) | |
327 | ||
328 | =cut | |
329 | ||
330 | #-------------------------------------------------------------------------- | |
331 | $ComTab{'P'}=[ 2, '', \&Emit, <<'-X-' ]; #ok | |
332 | { if( /^(.*)/ ){ print $1, "\n"; } } | |
333 | -X- | |
334 | ||
335 | =item [2addr]B<P> | |
336 | ||
337 | Prints the pattern space through the first embedded newline or to the end. | |
338 | ||
339 | =cut | |
340 | ||
341 | #-------------------------------------------------------------------------- | |
342 | $ComTab{'q'}=[ 1, '', \&Emit, <<'-X-' ]; #ok | |
343 | { print $_, "\n" if $doPrint; | |
344 | last CYCLE; | |
345 | } | |
346 | -X- | |
347 | ||
348 | =item [1addr]B<q> | |
349 | ||
350 | Branch to the end of the script and quit without starting a new cycle. | |
351 | ||
352 | =cut | |
353 | ||
354 | #-------------------------------------------------------------------------- | |
355 | $ComTab{'r'}=[ 1, 'str', \&Emit, "{ _r( '-X-' ) }" ]; #ok | |
356 | ||
357 | =item [1addr]B<r> I<file> | |
358 | ||
359 | Copy the contents of the I<file> to standard output immediately before | |
360 | the next attempt to read a line of input. Any error encountered while | |
361 | reading I<file> is silently ignored. | |
362 | ||
363 | =cut | |
364 | ||
365 | #-------------------------------------------------------------------------- | |
366 | $ComTab{'s'}=[ 2, 'sub', \&Emit, '' ]; #ok | |
367 | ||
368 | =item [2addr]B<s/>I<regular expression>B</>I<replacement>B</>I<flags> | |
369 | ||
370 | Substitute the I<replacement> string for the first substring in | |
371 | the pattern space that matches the I<regular expression>. | |
372 | Any character other than backslash or newline can be used instead of a | |
373 | slash to delimit the regular expression and the replacement. | |
374 | To use the delimiter as a literal character within the regular expression | |
375 | and the replacement, precede the character by a backslash (`C<\>'). | |
376 | ||
377 | Literal newlines may be embedded in the replacement string by | |
378 | preceding a newline with a backslash. | |
379 | ||
380 | Within the replacement, an ampersand (`C<&>') is replaced by the string | |
381 | matching the regular expression. The strings `C<\1>' through `C<\9>' are | |
382 | replaced by the corresponding subpattern (see L<"Basic Regular Expressions">). | |
383 | To get a literal `C<&>' or `C<\>' in the replacement text, precede it | |
384 | by a backslash. | |
385 | ||
386 | The following I<flags> modify the behaviour of the B<s> command: | |
387 | ||
388 | =over 8 | |
389 | ||
390 | =item B<g> | |
391 | ||
392 | The replacement is performed for all matching, non-overlapping substrings | |
393 | of the pattern space. | |
394 | ||
395 | =item B<1>..B<9> | |
396 | ||
397 | Replace only the n-th matching substring of the pattern space. | |
398 | ||
399 | =item B<p> | |
400 | ||
401 | If the substitution was made, print the new value of the pattern space. | |
402 | ||
403 | =item B<w> I<file> | |
404 | ||
405 | If the substitution was made, write the new value of the pattern space | |
406 | to the specified file. | |
407 | ||
408 | =back | |
409 | ||
410 | =cut | |
411 | ||
412 | #-------------------------------------------------------------------------- | |
413 | $ComTab{'t'}=[ 2, 'str', \&Branch, '{ goto XXX if _t() }' ]; #ok | |
414 | ||
415 | =item [2addr]B<t> [I<label>] | |
416 | ||
417 | Branch to the B<:> function with the specified I<label> if any B<s> | |
418 | substitutions have been made since the most recent reading of an input line | |
419 | or execution of a B<t> function. If no label is given, branch to the end of | |
420 | the script. | |
421 | ||
422 | ||
423 | =cut | |
424 | ||
425 | #-------------------------------------------------------------------------- | |
426 | $ComTab{'w'}=[ 2, 'str', \&Write, "{ _w( '-X-' ) }" ]; #ok | |
427 | ||
428 | =item [2addr]B<w> I<file> | |
429 | ||
430 | The contents of the pattern space are written to the I<file>. | |
431 | ||
432 | =cut | |
433 | ||
434 | #-------------------------------------------------------------------------- | |
435 | $ComTab{'x'}=[ 2, '', \&Emit, '{ ($Hold, $_) = ($_, $Hold) }' ]; #ok | |
436 | ||
437 | =item [2addr]B<x> | |
438 | ||
439 | Swap the contents of the pattern space and the hold space. | |
440 | ||
441 | =cut | |
442 | ||
443 | #-------------------------------------------------------------------------- | |
444 | $ComTab{'y'}=[ 2, 'tra', \&Emit, '' ]; #ok | |
445 | =item [2addr]B<y>B</>I<string1>B</>I<string2>B</> | |
446 | ||
447 | In the pattern space, replace all characters occuring in I<string1> by the | |
448 | character at the corresponding position in I<string2>. It is possible | |
449 | to use any character (other than a backslash or newline) instead of a | |
450 | slash to delimit the strings. Within I<string1> and I<string2>, a | |
451 | backslash followed by any character other than a newline is that literal | |
452 | character, and a backslash followed by an `n' is replaced by a newline | |
453 | character. | |
454 | ||
455 | =cut | |
456 | ||
457 | #-------------------------------------------------------------------------- | |
458 | $ComTab{'='}=[ 1, '', \&Emit, '{ print "$.\n" }' ]; #ok | |
459 | ||
460 | =item [1addr]B<=> | |
461 | ||
462 | Prints the current line number on the standard output. | |
463 | ||
464 | =cut | |
465 | ||
466 | #-------------------------------------------------------------------------- | |
467 | $ComTab{':'}=[ 0, 'str', \&Label, '' ]; #ok | |
468 | ||
469 | =item [0addr]B<:> [I<label>] | |
470 | ||
471 | The command specifies the position of the I<label>. It has no other effect. | |
472 | ||
473 | =cut | |
474 | ||
475 | #-------------------------------------------------------------------------- | |
476 | $ComTab{'{'}=[ 2, '', \&BeginBlock, '{' ]; #ok | |
477 | $ComTab{'}'}=[ 0, '', \&EndBlock, ';}' ]; #ok | |
478 | # ';' to avoid warning on empty {}-block | |
479 | ||
480 | =item [2addr]B<{> [I<command>] | |
481 | ||
482 | =item [0addr]B<}> | |
483 | ||
484 | These two commands begin and end a command list. The first command may | |
485 | be given on the same line as the opening B<{> command. The commands | |
486 | within the list are jointly selected by the address(es) given on the | |
487 | B<{> command (but may still have individual addresses). | |
488 | ||
489 | =cut | |
490 | ||
491 | #-------------------------------------------------------------------------- | |
492 | $ComTab{'#'}=[ 0, 'str', \&Comment, '' ]; #ok | |
493 | ||
494 | =item [0addr]B<#> [I<comment>] | |
495 | ||
496 | The entire line is ignored (treated as a comment). If, however, the first | |
497 | two characters in the script are `C<#n>', automatic printing of output is | |
498 | suppressed, as if the B<-n> option were given on the command line. | |
499 | ||
500 | =back | |
501 | ||
502 | =cut | |
503 | ||
504 | use vars qw{ $isEOF $Hold %wFiles @Q $CondReg $doPrint }; | |
505 | ||
506 | my $useDEBUG = exists( $ENV{PSEDDEBUG} ); | |
507 | my $useEXTBRE = $ENV{PSEDEXTBRE} || ''; | |
508 | $useEXTBRE =~ s/[^<>wWyB]//g; # gawk RE's handle these | |
509 | ||
510 | my $doAutoPrint = 1; # automatic printing of pattern space (-n => 0) | |
511 | my $doOpenWrite = 1; # open w command output files at start (-a => 0) | |
512 | my $svOpenWrite = 0; # save $doOpenWrite | |
513 | ||
514 | # lower case $0 below as a VMSism. The VMS build procedure creates the | |
515 | # s2p file traditionally in upper case on the disk. When VMS is in a | |
516 | # case preserved or case sensitive mode, $0 will be returned in the exact | |
517 | # case which will be on the disk, and that is not predictable at this time. | |
518 | ||
519 | my $doGenerate = lc($0) eq 's2p'; | |
520 | ||
521 | # Collected and compiled script | |
522 | # | |
523 | my( @Commands, %Defined, @BlockStack, %Label, $labNum, $Code, $Func ); | |
524 | $Code = ''; | |
525 | ||
526 | ################## | |
527 | # Compile Time | |
528 | # | |
529 | # Labels | |
530 | # | |
531 | # Error handling | |
532 | # | |
533 | sub Warn($;$){ | |
534 | my( $msg, $loc ) = @_; | |
535 | $loc ||= ''; | |
536 | $loc .= ': ' if length( $loc ); | |
537 | warn( "$0: $loc$msg\n" ); | |
538 | } | |
539 | ||
540 | $labNum = 0; | |
541 | sub newLabel(){ | |
542 | return 'L_'.++$labNum; | |
543 | } | |
544 | ||
545 | # safeHere: create safe here delimiter and modify opcode and argument | |
546 | # | |
547 | sub safeHere($$){ | |
548 | my( $codref, $argref ) = @_; | |
549 | my $eod = 'EOD000'; | |
550 | while( $$argref =~ /^$eod$/m ){ | |
551 | $eod++; | |
552 | } | |
553 | $$codref =~ s/TheEnd/$eod/e; | |
554 | $$argref .= "$eod\n"; | |
555 | } | |
556 | ||
557 | # Emit: create address logic and emit command | |
558 | # | |
559 | sub Emit($$$$$$){ | |
560 | my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_; | |
561 | my $cond = ''; | |
562 | if( defined( $addr1 ) ){ | |
563 | if( defined( $addr2 ) ){ | |
564 | $addr1 .= $addr2 =~ /^\d+$/ ? "..$addr2" : "...$addr2"; | |
565 | } else { | |
566 | $addr1 .= ' == $.' if $addr1 =~ /^\d+$/; | |
567 | } | |
568 | $cond = $negated ? "unless( $addr1 )\n" : "if( $addr1 )\n"; | |
569 | } | |
570 | ||
571 | if( $opcode eq '' ){ | |
572 | $Code .= "$cond$arg\n"; | |
573 | ||
574 | } elsif( $opcode =~ s/-X-/$arg/e ){ | |
575 | $Code .= "$cond$opcode\n"; | |
576 | ||
577 | } elsif( $opcode =~ /TheEnd/ ){ | |
578 | safeHere( \$opcode, \$arg ); | |
579 | $Code .= "$cond$opcode$arg"; | |
580 | ||
581 | } else { | |
582 | $Code .= "$cond$opcode\n"; | |
583 | } | |
584 | 0; | |
585 | } | |
586 | ||
587 | # Write (w command, w flag): store pathname | |
588 | # | |
589 | sub Write($$$$$$){ | |
590 | my( $addr1, $addr2, $negated, $opcode, $path, $fl ) = @_; | |
591 | $wFiles{$path} = ''; | |
592 | Emit( $addr1, $addr2, $negated, $opcode, $path, $fl ); | |
593 | } | |
594 | ||
595 | ||
596 | # Label (: command): label definition | |
597 | # | |
598 | sub Label($$$$$$){ | |
599 | my( $addr1, $addr2, $negated, $opcode, $lab, $fl ) = @_; | |
600 | my $rc = 0; | |
601 | $lab =~ s/\s+//; | |
602 | if( length( $lab ) ){ | |
603 | my $h; | |
604 | if( ! exists( $Label{$lab} ) ){ | |
605 | $h = $Label{$lab}{name} = newLabel(); | |
606 | } else { | |
607 | $h = $Label{$lab}{name}; | |
608 | if( exists( $Label{$lab}{defined} ) ){ | |
609 | my $dl = $Label{$lab}{defined}; | |
610 | Warn( "duplicate label $lab (first defined at $dl)", $fl ); | |
611 | $rc = 1; | |
612 | } | |
613 | } | |
614 | $Label{$lab}{defined} = $fl; | |
615 | $Code .= "$h:;\n"; | |
616 | } | |
617 | $rc; | |
618 | } | |
619 | ||
620 | # BeginBlock ({ command): push block start | |
621 | # | |
622 | sub BeginBlock($$$$$$){ | |
623 | my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_; | |
624 | push( @BlockStack, [ $fl, $addr1, $addr2, $negated ] ); | |
625 | Emit( $addr1, $addr2, $negated, $opcode, $arg, $fl ); | |
626 | } | |
627 | ||
628 | # EndBlock (} command): check proper nesting | |
629 | # | |
630 | sub EndBlock($$$$$$){ | |
631 | my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_; | |
632 | my $rc; | |
633 | my $jcom = pop( @BlockStack ); | |
634 | if( defined( $jcom ) ){ | |
635 | $rc = Emit( $addr1, $addr2, $negated, $opcode, $arg, $fl ); | |
636 | } else { | |
637 | Warn( "unexpected `}'", $fl ); | |
638 | $rc = 1; | |
639 | } | |
640 | $rc; | |
641 | } | |
642 | ||
643 | # Branch (t, b commands): check or create label, substitute default | |
644 | # | |
645 | sub Branch($$$$$$){ | |
646 | my( $addr1, $addr2, $negated, $opcode, $lab, $fl ) = @_; | |
647 | $lab =~ s/\s+//; # no spaces at end | |
648 | my $h; | |
649 | if( length( $lab ) ){ | |
650 | if( ! exists( $Label{$lab} ) ){ | |
651 | $h = $Label{$lab}{name} = newLabel(); | |
652 | } else { | |
653 | $h = $Label{$lab}{name}; | |
654 | } | |
655 | push( @{$Label{$lab}{used}}, $fl ); | |
656 | } else { | |
657 | $h = 'EOS'; | |
658 | } | |
659 | $opcode =~ s/XXX/$h/e; | |
660 | Emit( $addr1, $addr2, $negated, $opcode, '', $fl ); | |
661 | } | |
662 | ||
663 | # Change (c command): is special due to range end watching | |
664 | # | |
665 | sub Change($$$$$$){ | |
666 | my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_; | |
667 | my $kwd = $negated ? 'unless' : 'if'; | |
668 | if( defined( $addr2 ) ){ | |
669 | $addr1 .= $addr2 =~ /^\d+$/ ? "..$addr2" : "...$addr2"; | |
670 | if( ! $negated ){ | |
671 | $addr1 = '$icnt = ('.$addr1.')'; | |
672 | $opcode = 'if( $icnt =~ /E0$/ )' . $opcode; | |
673 | } | |
674 | } else { | |
675 | $addr1 .= ' == $.' if $addr1 =~ /^\d+$/; | |
676 | } | |
677 | safeHere( \$opcode, \$arg ); | |
678 | $Code .= "$kwd( $addr1 ){\n $opcode$arg}\n"; | |
679 | 0; | |
680 | } | |
681 | ||
682 | ||
683 | # Comment (# command): A no-op. Who would've thought that! | |
684 | # | |
685 | sub Comment($$$$$$){ | |
686 | my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_; | |
687 | ### $Code .= "# $arg\n"; | |
688 | 0; | |
689 | } | |
690 | ||
691 | ||
692 | sub stripRegex($$){ | |
693 | my( $del, $sref ) = @_; | |
694 | my $regex = $del; | |
695 | print "stripRegex:$del:$$sref:\n" if $useDEBUG; | |
696 | while( $$sref =~ s{^(.*?)(\\*)\Q$del\E(\s*)}{}s ){ | |
697 | my $sl = $2; | |
698 | $regex .= $1.$sl.$del; | |
699 | if( length( $sl ) % 2 == 0 ){ | |
700 | return $regex; | |
701 | } | |
702 | $regex .= $3; | |
703 | } | |
704 | undef(); | |
705 | } | |
706 | ||
707 | # stripTrans: take a <del> terminated string from y command | |
708 | # honoring and cleaning up of \-escaped <del>'s | |
709 | # | |
710 | sub stripTrans($$){ | |
711 | my( $del, $sref ) = @_; | |
712 | my $t = ''; | |
713 | print "stripTrans:$del:$$sref:\n" if $useDEBUG; | |
714 | while( $$sref =~ s{^(.*?)(\\*)\Q$del\E}{}s ){ | |
715 | my $sl = $2; | |
716 | $t .= $1; | |
717 | if( length( $sl ) % 2 == 0 ){ | |
718 | $t .= $sl; | |
719 | $t =~ s/\\\\/\\/g; | |
720 | return $t; | |
721 | } | |
722 | chop( $sl ); | |
723 | $t .= $sl.$del.$3; | |
724 | } | |
725 | undef(); | |
726 | } | |
727 | ||
728 | # makey - construct Perl y/// from sed y/// | |
729 | # | |
730 | sub makey($$$){ | |
731 | my( $fr, $to, $fl ) = @_; | |
732 | my $error = 0; | |
733 | ||
734 | # Ensure that any '-' is up front. | |
735 | # Diagnose duplicate contradicting mappings | |
736 | my %tr; | |
737 | for( my $i = 0; $i < length($fr); $i++ ){ | |
738 | my $fc = substr($fr,$i,1); | |
739 | my $tc = substr($to,$i,1); | |
740 | if( exists( $tr{$fc} ) && $tr{$fc} ne $tc ){ | |
741 | Warn( "ambiguous translation for character `$fc' in `y' command", | |
742 | $fl ); | |
743 | $error++; | |
744 | } | |
745 | $tr{$fc} = $tc; | |
746 | } | |
747 | $fr = $to = ''; | |
748 | if( exists( $tr{'-'} ) ){ | |
749 | ( $fr, $to ) = ( '-', $tr{'-'} ); | |
750 | delete( $tr{'-'} ); | |
751 | } else { | |
752 | $fr = $to = ''; | |
753 | } | |
754 | # might just as well sort it... | |
755 | for my $fc ( sort keys( %tr ) ){ | |
756 | $fr .= $fc; | |
757 | $to .= $tr{$fc}; | |
758 | } | |
759 | # make embedded delimiters and newlines safe | |
760 | $fr =~ s/([{}])/\$1/g; | |
761 | $to =~ s/([{}])/\$1/g; | |
762 | $fr =~ s/\n/\\n/g; | |
763 | $to =~ s/\n/\\n/g; | |
764 | return $error ? undef() : "{ y{$fr}{$to}; }"; | |
765 | } | |
766 | ||
767 | ###### | |
768 | # makes - construct Perl s/// from sed s/// | |
769 | # | |
770 | sub makes($$$$$$$){ | |
771 | my( $regex, $subst, $path, $global, $print, $nmatch, $fl ) = @_; | |
772 | ||
773 | # make embedded newlines safe | |
774 | $regex =~ s/\n/\\n/g; | |
775 | $subst =~ s/\n/\\n/g; | |
776 | ||
777 | my $code; | |
778 | # n-th occurrence | |
779 | # | |
780 | if( length( $nmatch ) ){ | |
781 | $code = <<TheEnd; | |
782 | { \$n = $nmatch; | |
783 | while( --\$n && ( \$s = m ${regex}g ) ){} | |
784 | \$s = ( substr( \$_, pos() ) =~ s ${regex}${subst}s ) if \$s; | |
785 | \$CondReg ||= \$s; | |
786 | TheEnd | |
787 | } else { | |
788 | $code = <<TheEnd; | |
789 | { \$s = s ${regex}${subst}s${global}; | |
790 | \$CondReg ||= \$s; | |
791 | TheEnd | |
792 | } | |
793 | if( $print ){ | |
794 | $code .= ' print $_, "\n" if $s;'."\n"; | |
795 | } | |
796 | if( defined( $path ) ){ | |
797 | $wFiles{$path} = ''; | |
798 | $code .= " _w( '$path' ) if \$s;\n"; | |
799 | $GenKey{'w'} = 1; | |
800 | } | |
801 | $code .= "}"; | |
802 | } | |
803 | ||
804 | =head1 BASIC REGULAR EXPRESSIONS | |
805 | ||
806 | A I<Basic Regular Expression> (BRE), as defined in POSIX 1003.2, consists | |
807 | of I<atoms>, for matching parts of a string, and I<bounds>, specifying | |
808 | repetitions of a preceding atom. | |
809 | ||
810 | =head2 Atoms | |
811 | ||
812 | The possible atoms of a BRE are: B<.>, matching any single character; | |
813 | B<^> and B<$>, matching the null string at the beginning or end | |
814 | of a string, respectively; a I<bracket expressions>, enclosed | |
815 | in B<[> and B<]> (see below); and any single character with no | |
816 | other significance (matching that character). A B<\> before one | |
817 | of: B<.>, B<^>, B<$>, B<[>, B<*>, B<\>, matching the character | |
818 | after the backslash. A sequence of atoms enclosed in B<\(> and B<\)> | |
819 | becomes an atom and establishes the target for a I<backreference>, | |
820 | consisting of the substring that actually matches the enclosed atoms. | |
821 | Finally, B<\> followed by one of the digits B<0> through B<9> is a | |
822 | backreference. | |
823 | ||
824 | A B<^> that is not first, or a B<$> that is not last does not have | |
825 | a special significance and need not be preceded by a backslash to | |
826 | become literal. The same is true for a B<]>, that does not terminate | |
827 | a bracket expression. | |
828 | ||
829 | An unescaped backslash cannot be last in a BRE. | |
830 | ||
831 | =head2 Bounds | |
832 | ||
833 | The BRE bounds are: B<*>, specifying 0 or more matches of the preceding | |
834 | atom; B<\{>I<count>B<\}>, specifying that many repetitions; | |
835 | B<\{>I<minimum>B<,\}>, giving a lower limit; and | |
836 | B<\{>I<minimum>B<,>I<maximum>B<\}> finally defines a lower and upper | |
837 | bound. | |
838 | ||
839 | A bound appearing as the first item in a BRE is taken literally. | |
840 | ||
841 | =head2 Bracket Expressions | |
842 | ||
843 | A I<bracket expression> is a list of characters, character ranges | |
844 | and character classes enclosed in B<[> and B<]> and matches any | |
845 | single character from the represented set of characters. | |
846 | ||
847 | A character range is written as two characters separated by B<-> and | |
848 | represents all characters (according to the character collating sequence) | |
849 | that are not less than the first and not greater than the second. | |
850 | (Ranges are very collating-sequence-dependent, and portable programs | |
851 | should avoid relying on them.) | |
852 | ||
853 | A character class is one of the class names | |
854 | ||
855 | alnum digit punct | |
856 | alpha graph space | |
857 | blank lower upper | |
858 | cntrl print xdigit | |
859 | ||
860 | enclosed in B<[:> and B<:]> and represents the set of characters | |
861 | as defined in ctype(3). | |
862 | ||
863 | If the first character after B<[> is B<^>, the sense of matching is | |
864 | inverted. | |
865 | ||
866 | To include a literal `C<^>', place it anywhere else but first. To | |
867 | include a literal 'C<]>' place it first or immediately after an | |
868 | initial B<^>. To include a literal `C<->' make it the first (or | |
869 | second after B<^>) or last character, or the second endpoint of | |
870 | a range. | |
871 | ||
872 | The special bracket expression constructs C<[[:E<lt>:]]> and C<[[:E<gt>:]]> | |
873 | match the null string at the beginning and end of a word respectively. | |
874 | (Note that neither is identical to Perl's `\b' atom.) | |
875 | ||
876 | =head2 Additional Atoms | |
877 | ||
878 | Since some sed implementations provide additional regular expression | |
879 | atoms (not defined in POSIX 1003.2), B<psed> is capable of translating | |
880 | the following backslash escapes: | |
881 | ||
882 | =over 4 | |
883 | ||
884 | =item B<\E<lt>> This is the same as C<[[:E<gt>:]]>. | |
885 | ||
886 | =item B<\E<gt>> This is the same as C<[[:E<lt>:]]>. | |
887 | ||
888 | =item B<\w> This is an abbreviation for C<[[:alnum:]_]>. | |
889 | ||
890 | =item B<\W> This is an abbreviation for C<[^[:alnum:]_]>. | |
891 | ||
892 | =item B<\y> Match the empty string at a word boundary. | |
893 | ||
894 | =item B<\B> Match the empty string between any two either word or non-word characters. | |
895 | ||
896 | =back | |
897 | ||
898 | To enable this feature, the environment variable PSEDEXTBRE must be set | |
899 | to a string containing the requested characters, e.g.: | |
900 | C<PSEDEXTBRE='E<lt>E<gt>wW'>. | |
901 | ||
902 | =cut | |
903 | ||
904 | ##### | |
905 | # bre2p - convert BRE to Perl RE | |
906 | # | |
907 | sub peek(\$$){ | |
908 | my( $pref, $ic ) = @_; | |
909 | $ic < length($$pref)-1 ? substr( $$pref, $ic+1, 1 ) : ''; | |
910 | } | |
911 | ||
912 | sub bre2p($$$){ | |
913 | my( $del, $pat, $fl ) = @_; | |
914 | my $led = $del; | |
915 | $led =~ tr/{([</})]>/; | |
916 | $led = '' if $led eq $del; | |
917 | ||
918 | $pat = substr( $pat, 1, length($pat) - 2 ); | |
919 | my $res = ''; | |
920 | my $bracklev = 0; | |
921 | my $backref = 0; | |
922 | my $parlev = 0; | |
923 | for( my $ic = 0; $ic < length( $pat ); $ic++ ){ | |
924 | my $c = substr( $pat, $ic, 1 ); | |
925 | if( $c eq '\\' ){ | |
926 | ### backslash escapes | |
927 | my $nc = peek($pat,$ic); | |
928 | if( $nc eq '' ){ | |
929 | Warn( "`\\' cannot be last in pattern", $fl ); | |
930 | return undef(); | |
931 | } | |
932 | $ic++; | |
933 | if( $nc eq $del ){ ## \<pattern del> => \<pattern del> | |
934 | $res .= "\\$del"; | |
935 | ||
936 | } elsif( $nc =~ /([[.*\\n])/ ){ | |
937 | ## check for \-escaped magics and \n: | |
938 | ## \[ \. \* \\ \n stay as they are | |
939 | $res .= '\\'.$nc; | |
940 | ||
941 | } elsif( $nc eq '(' ){ ## \( => ( | |
942 | $parlev++; | |
943 | $res .= '('; | |
944 | ||
945 | } elsif( $nc eq ')' ){ ## \) => ) | |
946 | $parlev--; | |
947 | $backref++; | |
948 | if( $parlev < 0 ){ | |
949 | Warn( "unmatched `\\)'", $fl ); | |
950 | return undef(); | |
951 | } | |
952 | $res .= ')'; | |
953 | ||
954 | } elsif( $nc eq '{' ){ ## repetition factor \{<i>[,[<j>]]\} | |
955 | my $endpos = index( $pat, '\\}', $ic ); | |
956 | if( $endpos < 0 ){ | |
957 | Warn( "unmatched `\\{'", $fl ); | |
958 | return undef(); | |
959 | } | |
960 | my $rep = substr( $pat, $ic+1, $endpos-($ic+1) ); | |
961 | $ic = $endpos + 1; | |
962 | ||
963 | if( $res =~ /^\^?$/ ){ | |
964 | $res .= "\\{$rep\}"; | |
965 | } elsif( $rep =~ /^(\d+)(,?)(\d*)?$/ ){ | |
966 | my $min = $1; | |
967 | my $com = $2 || ''; | |
968 | my $max = $3; | |
969 | if( length( $max ) ){ | |
970 | if( $max < $min ){ | |
971 | Warn( "maximum less than minimum in `\\{$rep\\}'", | |
972 | $fl ); | |
973 | return undef(); | |
974 | } | |
975 | } else { | |
976 | $max = ''; | |
977 | } | |
978 | # simplify some | |
979 | if( $min == 0 && $max eq '1' ){ | |
980 | $res .= '?'; | |
981 | } elsif( $min == 1 && "$com$max" eq ',' ){ | |
982 | $res .= '+'; | |
983 | } elsif( $min == 0 && "$com$max" eq ',' ){ | |
984 | $res .= '*'; | |
985 | } else { | |
986 | $res .= "{$min$com$max}"; | |
987 | } | |
988 | } else { | |
989 | Warn( "invalid repeat clause `\\{$rep\\}'", $fl ); | |
990 | return undef(); | |
991 | } | |
992 | ||
993 | } elsif( $nc =~ /^[1-9]$/ ){ | |
994 | ## \1 .. \9 => \1 .. \9, but check for a following digit | |
995 | if( $nc > $backref ){ | |
996 | Warn( "invalid backreference ($nc)", $fl ); | |
997 | return undef(); | |
998 | } | |
999 | $res .= "\\$nc"; | |
1000 | if( peek($pat,$ic) =~ /[0-9]/ ){ | |
1001 | $res .= '(?:)'; | |
1002 | } | |
1003 | ||
1004 | } elsif( $useEXTBRE && ( $nc =~ /[$useEXTBRE]/ ) ){ | |
1005 | ## extensions - at most <>wWyB - not in POSIX | |
1006 | if( $nc eq '<' ){ ## \< => \b(?=\w), be precise | |
1007 | $res .= '\\b(?<=\\W)'; | |
1008 | } elsif( $nc eq '>' ){ ## \> => \b(?=\W), be precise | |
1009 | $res .= '\\b(?=\\W)'; | |
1010 | } elsif( $nc eq 'y' ){ ## \y => \b | |
1011 | $res .= '\\b'; | |
1012 | } else { ## \B, \w, \W remain the same | |
1013 | $res .= "\\$nc"; | |
1014 | } | |
1015 | } elsif( $nc eq $led ){ | |
1016 | ## \<closing bracketing-delimiter> - keep '\' | |
1017 | $res .= "\\$nc"; | |
1018 | ||
1019 | } else { ## \ <char> => <char> ("as if `\' were not present") | |
1020 | $res .= $nc; | |
1021 | } | |
1022 | ||
1023 | } elsif( $c eq '.' ){ ## . => . | |
1024 | $res .= $c; | |
1025 | ||
1026 | } elsif( $c eq '*' ){ ## * => * but \* if there's nothing preceding it | |
1027 | if( $res =~ /^\^?$/ ){ | |
1028 | $res .= '\\*'; | |
1029 | } elsif( substr( $res, -1, 1 ) ne '*' ){ | |
1030 | $res .= $c; | |
1031 | } | |
1032 | ||
1033 | } elsif( $c eq '[' ){ | |
1034 | ## parse []: [^...] [^]...] [-...] | |
1035 | my $add = '['; | |
1036 | if( peek($pat,$ic) eq '^' ){ | |
1037 | $ic++; | |
1038 | $add .= '^'; | |
1039 | } | |
1040 | my $nc = peek($pat,$ic); | |
1041 | if( $nc eq ']' || $nc eq '-' ){ | |
1042 | $add .= $nc; | |
1043 | $ic++; | |
1044 | } | |
1045 | # check that [ is not trailing | |
1046 | if( $ic >= length( $pat ) - 1 ){ | |
1047 | Warn( "unmatched `['", $fl ); | |
1048 | return undef(); | |
1049 | } | |
1050 | # look for [:...:] and x-y | |
1051 | my $rstr = substr( $pat, $ic+1 ); | |
1052 | if( $rstr =~ /^((?:\[:\(\w+|[><]\):\]|[^]-](?:-[^]])?)*)/ ){ | |
1053 | my $cnt = $1; | |
1054 | $ic += length( $cnt ); | |
1055 | $cnt =~ s/([\\\$])/\\$1/g; # `\', `$' are magic in Perl [] | |
1056 | # try some simplifications | |
1057 | my $red = $cnt; | |
1058 | if( $red =~ s/0-9// ){ | |
1059 | $cnt = $red.'\d'; | |
1060 | if( $red =~ s/A-Z// && $red =~ s/a-z// && $red =~ s/_// ){ | |
1061 | $cnt = $red.'\w'; | |
1062 | } | |
1063 | } | |
1064 | $add .= $cnt; | |
1065 | ||
1066 | # POSIX 1003.2 has this (optional) for begin/end word | |
1067 | $add = '\\b(?=\\W)' if $add eq '[[:<:]]'; | |
1068 | $add = '\\b(?<=\\W)' if $add eq '[[:>:]]'; | |
1069 | ||
1070 | } | |
1071 | ||
1072 | ## may have a trailing `-' before `]' | |
1073 | if( $ic < length($pat) - 1 && | |
1074 | substr( $pat, $ic+1 ) =~ /^(-?])/ ){ | |
1075 | $ic += length( $1 ); | |
1076 | $add .= $1; | |
1077 | # another simplification | |
1078 | $add =~ s/^\[(\^?)(\\[dw])]$/ $1 eq '^' ? uc($2) : $2 /e; | |
1079 | $res .= $add; | |
1080 | } else { | |
1081 | Warn( "unmatched `['", $fl ); | |
1082 | return undef(); | |
1083 | } | |
1084 | ||
1085 | } elsif( $c eq $led ){ ## unescaped <closing bracketing-delimiter> | |
1086 | $res .= "\\$c"; | |
1087 | ||
1088 | } elsif( $c eq ']' ){ ## unmatched ] is not magic | |
1089 | $res .= ']'; | |
1090 | ||
1091 | } elsif( $c =~ /[|+?{}()]/ ){ ## not magic in BRE, but in Perl: \-quote | |
1092 | $res .= "\\$c"; | |
1093 | ||
1094 | } elsif( $c eq '^' ){ ## not magic unless 1st, but in Perl: \-quote | |
1095 | $res .= length( $res ) ? '\\^' : '^'; | |
1096 | ||
1097 | } elsif( $c eq '$' ){ ## not magic unless last, but in Perl: \-quote | |
1098 | $res .= $ic == length( $pat ) - 1 ? '$' : '\\$'; | |
1099 | ||
1100 | } else { | |
1101 | $res .= $c; | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | if( $parlev ){ | |
1106 | Warn( "unmatched `\\('", $fl ); | |
1107 | return undef(); | |
1108 | } | |
1109 | ||
1110 | # final cleanup: eliminate raw HTs | |
1111 | $res =~ s/\t/\\t/g; | |
1112 | return $del . $res . ( $led ? $led : $del ); | |
1113 | } | |
1114 | ||
1115 | ||
1116 | ##### | |
1117 | # sub2p - convert sed substitution to Perl substitution | |
1118 | # | |
1119 | sub sub2p($$$){ | |
1120 | my( $del, $subst, $fl ) = @_; | |
1121 | my $led = $del; | |
1122 | $led =~ tr/{([</})]>/; | |
1123 | $led = '' if $led eq $del; | |
1124 | ||
1125 | $subst = substr( $subst, 1, length($subst) - 2 ); | |
1126 | my $res = ''; | |
1127 | ||
1128 | for( my $ic = 0; $ic < length( $subst ); $ic++ ){ | |
1129 | my $c = substr( $subst, $ic, 1 ); | |
1130 | if( $c eq '\\' ){ | |
1131 | ### backslash escapes | |
1132 | my $nc = peek($subst,$ic); | |
1133 | if( $nc eq '' ){ | |
1134 | Warn( "`\\' cannot be last in substitution", $fl ); | |
1135 | return undef(); | |
1136 | } | |
1137 | $ic++; | |
1138 | if( $nc =~ /[\\$del$led]/ ){ ## \ and delimiter | |
1139 | $res .= '\\' . $nc; | |
1140 | } elsif( $nc =~ /[1-9]/ ){ ## \1 - \9 => ${1} - ${9} | |
1141 | $res .= '${' . $nc . '}'; | |
1142 | } else { ## everything else (includes &): omit \ | |
1143 | $res .= $nc; | |
1144 | } | |
1145 | } elsif( $c eq '&' ){ ## & => $& | |
1146 | $res .= '$&'; | |
1147 | } elsif( $c =~ /[\$\@$led]/ ){ ## magic in Perl's substitution string | |
1148 | $res .= '\\' . $c; | |
1149 | } else { | |
1150 | $res .= $c; | |
1151 | } | |
1152 | } | |
1153 | ||
1154 | # final cleanup: eliminate raw HTs | |
1155 | $res =~ s/\t/\\t/g; | |
1156 | return ( $led ? $del : $led ) . $res . ( $led ? $led : $del ); | |
1157 | } | |
1158 | ||
1159 | ||
1160 | sub Parse(){ | |
1161 | my $error = 0; | |
1162 | my( $pdef, $pfil, $plin ); | |
1163 | for( my $icom = 0; $icom < @Commands; $icom++ ){ | |
1164 | my $cmd = $Commands[$icom]; | |
1165 | print "Parse:$cmd:\n" if $useDEBUG; | |
1166 | $cmd =~ s/^\s+//; | |
1167 | next unless length( $cmd ); | |
1168 | my $scom = $icom; | |
1169 | if( exists( $Defined{$icom} ) ){ | |
1170 | $pdef = $Defined{$icom}; | |
1171 | if( $pdef =~ /^ #(\d+)/ ){ | |
1172 | $pfil = 'expression #'; | |
1173 | $plin = $1; | |
1174 | } else { | |
1175 | $pfil = "$pdef l."; | |
1176 | $plin = 1; | |
1177 | } | |
1178 | } else { | |
1179 | $plin++; | |
1180 | } | |
1181 | my $fl = "$pfil$plin"; | |
1182 | ||
1183 | # insert command as comment in gnerated code | |
1184 | # | |
1185 | $Code .= "# $cmd\n" if $doGenerate; | |
1186 | ||
1187 | # The Address(es) | |
1188 | # | |
1189 | my( $negated, $naddr, $addr1, $addr2 ); | |
1190 | $naddr = 0; | |
1191 | if( $cmd =~ s/^(\d+)\s*// ){ | |
1192 | $addr1 = "$1"; $naddr++; | |
1193 | } elsif( $cmd =~ s/^\$\s*// ){ | |
1194 | $addr1 = 'eofARGV()'; $naddr++; | |
1195 | } elsif( $cmd =~ s{^(/)}{} || $cmd =~ s{^\\(.)}{} ){ | |
1196 | my $del = $1; | |
1197 | my $regex = stripRegex( $del, \$cmd ); | |
1198 | if( defined( $regex ) ){ | |
1199 | $addr1 = 'm '.bre2p( $del, $regex, $fl ).'s'; | |
1200 | $naddr++; | |
1201 | } else { | |
1202 | Warn( "malformed regex, 1st address", $fl ); | |
1203 | $error++; | |
1204 | next; | |
1205 | } | |
1206 | } | |
1207 | if( defined( $addr1 ) && $cmd =~ s/,\s*// ){ | |
1208 | if( $cmd =~ s/^(\d+)\s*// ){ | |
1209 | $addr2 = "$1"; $naddr++; | |
1210 | } elsif( $cmd =~ s/^\$\s*// ){ | |
1211 | $addr2 = 'eofARGV()'; $naddr++; | |
1212 | } elsif( $cmd =~ s{^(/)}{} || $cmd =~ s{^\\(.)}{} ){ | |
1213 | my $del = $1; | |
1214 | my $regex = stripRegex( $del, \$cmd ); | |
1215 | if( defined( $regex ) ){ | |
1216 | $addr2 = 'm '. bre2p( $del, $regex, $fl ).'s'; | |
1217 | $naddr++; | |
1218 | } else { | |
1219 | Warn( "malformed regex, 2nd address", $fl ); | |
1220 | $error++; | |
1221 | next; | |
1222 | } | |
1223 | } else { | |
1224 | Warn( "invalid address after `,'", $fl ); | |
1225 | $error++; | |
1226 | next; | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | # address modifier `!' | |
1231 | # | |
1232 | $negated = $cmd =~ s/^!\s*//; | |
1233 | if( defined( $addr1 ) ){ | |
1234 | print "Parse: addr1=$addr1" if $useDEBUG; | |
1235 | if( defined( $addr2 ) ){ | |
1236 | print ", addr2=$addr2 " if $useDEBUG; | |
1237 | # both numeric and addr1 > addr2 => eliminate addr2 | |
1238 | undef( $addr2 ) if $addr1 =~ /^\d+$/ && | |
1239 | $addr2 =~ /^\d+$/ && $addr1 > $addr2; | |
1240 | } | |
1241 | } | |
1242 | print 'negated' if $useDEBUG && $negated; | |
1243 | print " command:$cmd\n" if $useDEBUG; | |
1244 | ||
1245 | # The Command | |
1246 | # | |
1247 | if( $cmd !~ s/^([:#={}abcdDgGhHilnNpPqrstwxy])\s*// ){ | |
1248 | my $h = substr( $cmd, 0, 1 ); | |
1249 | Warn( "unknown command `$h'", $fl ); | |
1250 | $error++; | |
1251 | next; | |
1252 | } | |
1253 | my $key = $1; | |
1254 | ||
1255 | my $tabref = $ComTab{$key}; | |
1256 | $GenKey{$key} = 1; | |
1257 | if( $naddr > $tabref->[0] ){ | |
1258 | Warn( "excess address(es)", $fl ); | |
1259 | $error++; | |
1260 | next; | |
1261 | } | |
1262 | ||
1263 | my $arg = ''; | |
1264 | if( $tabref->[1] eq 'str' ){ | |
1265 | # take remainder - don't care if it is empty | |
1266 | $arg = $cmd; | |
1267 | $cmd = ''; | |
1268 | ||
1269 | } elsif( $tabref->[1] eq 'txt' ){ | |
1270 | # multi-line text | |
1271 | my $goon = $cmd =~ /(.*)\\$/; | |
1272 | if( length( $1 ) ){ | |
1273 | Warn( "extra characters after command ($cmd)", $fl ); | |
1274 | $error++; | |
1275 | } | |
1276 | while( $goon ){ | |
1277 | $icom++; | |
1278 | if( $icom > $#Commands ){ | |
1279 | Warn( "unexpected end of script", $fl ); | |
1280 | $error++; | |
1281 | last; | |
1282 | } | |
1283 | $cmd = $Commands[$icom]; | |
1284 | $Code .= "# $cmd\n" if $doGenerate; | |
1285 | $goon = $cmd =~ s/\\$//; | |
1286 | $cmd =~ s/\\(.)/$1/g; | |
1287 | $arg .= "\n" if length( $arg ); | |
1288 | $arg .= $cmd; | |
1289 | } | |
1290 | $arg .= "\n" if length( $arg ); | |
1291 | $cmd = ''; | |
1292 | ||
1293 | } elsif( $tabref->[1] eq 'sub' ){ | |
1294 | # s/// | |
1295 | if( ! length( $cmd ) ){ | |
1296 | Warn( "`s' command requires argument", $fl ); | |
1297 | $error++; | |
1298 | next; | |
1299 | } | |
1300 | if( $cmd =~ s{^([^\\\n])}{} ){ | |
1301 | my $del = $1; | |
1302 | my $regex = stripRegex( $del, \$cmd ); | |
1303 | if( ! defined( $regex ) ){ | |
1304 | Warn( "malformed regular expression", $fl ); | |
1305 | $error++; | |
1306 | next; | |
1307 | } | |
1308 | $regex = bre2p( $del, $regex, $fl ); | |
1309 | ||
1310 | # a trailing \ indicates embedded NL (in replacement string) | |
1311 | while( $cmd =~ s/(?<!\\)\\$/\n/ ){ | |
1312 | $icom++; | |
1313 | if( $icom > $#Commands ){ | |
1314 | Warn( "unexpected end of script", $fl ); | |
1315 | $error++; | |
1316 | last; | |
1317 | } | |
1318 | $cmd .= $Commands[$icom]; | |
1319 | $Code .= "# $Commands[$icom]\n" if $doGenerate; | |
1320 | } | |
1321 | ||
1322 | my $subst = stripRegex( $del, \$cmd ); | |
1323 | if( ! defined( $regex ) ){ | |
1324 | Warn( "malformed substitution expression", $fl ); | |
1325 | $error++; | |
1326 | next; | |
1327 | } | |
1328 | $subst = sub2p( $del, $subst, $fl ); | |
1329 | ||
1330 | # parse s/// modifier: g|p|0-9|w <file> | |
1331 | my( $global, $nmatch, $print, $write ) = | |
1332 | ( '', '', 0, undef ); | |
1333 | while( $cmd =~ s/^([gp0-9])// ){ | |
1334 | $1 eq 'g' ? ( $global = 'g' ) : | |
1335 | $1 eq 'p' ? ( $print = $1 ) : ( $nmatch .= $1 ); | |
1336 | } | |
1337 | $write = $1 if $cmd =~ s/w\s*(.*)$//; | |
1338 | ### $nmatch =~ s/^(\d)\1*$/$1/; ### may be dangerous? | |
1339 | if( $global && length( $nmatch ) || length( $nmatch ) > 1 ){ | |
1340 | Warn( "conflicting flags `$global$nmatch'", $fl ); | |
1341 | $error++; | |
1342 | next; | |
1343 | } | |
1344 | ||
1345 | $arg = makes( $regex, $subst, | |
1346 | $write, $global, $print, $nmatch, $fl ); | |
1347 | if( ! defined( $arg ) ){ | |
1348 | $error++; | |
1349 | next; | |
1350 | } | |
1351 | ||
1352 | } else { | |
1353 | Warn( "improper delimiter in s command", $fl ); | |
1354 | $error++; | |
1355 | next; | |
1356 | } | |
1357 | ||
1358 | } elsif( $tabref->[1] eq 'tra' ){ | |
1359 | # y/// | |
1360 | # a trailing \ indicates embedded newline | |
1361 | while( $cmd =~ s/(?<!\\)\\$/\n/ ){ | |
1362 | $icom++; | |
1363 | if( $icom > $#Commands ){ | |
1364 | Warn( "unexpected end of script", $fl ); | |
1365 | $error++; | |
1366 | last; | |
1367 | } | |
1368 | $cmd .= $Commands[$icom]; | |
1369 | $Code .= "# $Commands[$icom]\n" if $doGenerate; | |
1370 | } | |
1371 | if( ! length( $cmd ) ){ | |
1372 | Warn( "`y' command requires argument", $fl ); | |
1373 | $error++; | |
1374 | next; | |
1375 | } | |
1376 | my $d = substr( $cmd, 0, 1 ); $cmd = substr( $cmd, 1 ); | |
1377 | if( $d eq '\\' ){ | |
1378 | Warn( "`\\' not valid as delimiter in `y' command", $fl ); | |
1379 | $error++; | |
1380 | next; | |
1381 | } | |
1382 | my $fr = stripTrans( $d, \$cmd ); | |
1383 | if( ! defined( $fr ) || ! length( $cmd ) ){ | |
1384 | Warn( "malformed `y' command argument", $fl ); | |
1385 | $error++; | |
1386 | next; | |
1387 | } | |
1388 | my $to = stripTrans( $d, \$cmd ); | |
1389 | if( ! defined( $to ) ){ | |
1390 | Warn( "malformed `y' command argument", $fl ); | |
1391 | $error++; | |
1392 | next; | |
1393 | } | |
1394 | if( length($fr) != length($to) ){ | |
1395 | Warn( "string lengths in `y' command differ", $fl ); | |
1396 | $error++; | |
1397 | next; | |
1398 | } | |
1399 | if( ! defined( $arg = makey( $fr, $to, $fl ) ) ){ | |
1400 | $error++; | |
1401 | next; | |
1402 | } | |
1403 | ||
1404 | } | |
1405 | ||
1406 | # $cmd must be now empty - exception is { | |
1407 | if( $cmd !~ /^\s*$/ ){ | |
1408 | if( $key eq '{' ){ | |
1409 | # dirty hack to process command on '{' line | |
1410 | $Commands[$icom--] = $cmd; | |
1411 | } else { | |
1412 | Warn( "extra characters after command ($cmd)", $fl ); | |
1413 | $error++; | |
1414 | next; | |
1415 | } | |
1416 | } | |
1417 | ||
1418 | # Make Code | |
1419 | # | |
1420 | if( &{$tabref->[2]}( $addr1, $addr2, $negated, | |
1421 | $tabref->[3], $arg, $fl ) ){ | |
1422 | $error++; | |
1423 | } | |
1424 | } | |
1425 | ||
1426 | while( @BlockStack ){ | |
1427 | my $bl = pop( @BlockStack ); | |
1428 | Warn( "start of unterminated `{'", $bl ); | |
1429 | $error++; | |
1430 | } | |
1431 | ||
1432 | for my $lab ( keys( %Label ) ){ | |
1433 | if( ! exists( $Label{$lab}{defined} ) ){ | |
1434 | for my $used ( @{$Label{$lab}{used}} ){ | |
1435 | Warn( "undefined label `$lab'", $used ); | |
1436 | $error++; | |
1437 | } | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | exit( 1 ) if $error; | |
1442 | } | |
1443 | ||
1444 | ||
1445 | ############## | |
1446 | #### MAIN #### | |
1447 | ############## | |
1448 | ||
1449 | sub usage(){ | |
1450 | print STDERR "Usage: sed [-an] command [file...]\n"; | |
1451 | print STDERR " [-an] [-e command] [-f script-file] [file...]\n"; | |
1452 | } | |
1453 | ||
1454 | ################### | |
1455 | # Here we go again... | |
1456 | # | |
1457 | my $expr = 0; | |
1458 | while( @ARGV && $ARGV[0] =~ /^-(.)(.*)$/ ){ | |
1459 | my $opt = $1; | |
1460 | my $arg = $2; | |
1461 | shift( @ARGV ); | |
1462 | if( $opt eq 'e' ){ | |
1463 | if( length( $arg ) ){ | |
1464 | push( @Commands, split( "\n", $arg ) ); | |
1465 | } elsif( @ARGV ){ | |
1466 | push( @Commands, shift( @ARGV ) ); | |
1467 | } else { | |
1468 | Warn( "option -e requires an argument" ); | |
1469 | usage(); | |
1470 | exit( 1 ); | |
1471 | } | |
1472 | $expr++; | |
1473 | $Defined{$#Commands} = " #$expr"; | |
1474 | next; | |
1475 | } | |
1476 | if( $opt eq 'f' ){ | |
1477 | my $path; | |
1478 | if( length( $arg ) ){ | |
1479 | $path = $arg; | |
1480 | } elsif( @ARGV ){ | |
1481 | $path = shift( @ARGV ); | |
1482 | } else { | |
1483 | Warn( "option -f requires an argument" ); | |
1484 | usage(); | |
1485 | exit( 1 ); | |
1486 | } | |
1487 | my $fst = $#Commands + 1; | |
1488 | open( SCRIPT, "<$path" ) || die( "$0: $path: could not open ($!)\n" ); | |
1489 | my $cmd; | |
1490 | while( defined( $cmd = <SCRIPT> ) ){ | |
1491 | chomp( $cmd ); | |
1492 | push( @Commands, $cmd ); | |
1493 | } | |
1494 | close( SCRIPT ); | |
1495 | if( $#Commands >= $fst ){ | |
1496 | $Defined{$fst} = "$path"; | |
1497 | } | |
1498 | next; | |
1499 | } | |
1500 | if( $opt eq '-' && $arg eq '' ){ | |
1501 | last; | |
1502 | } | |
1503 | if( $opt eq 'h' || $opt eq '?' ){ | |
1504 | usage(); | |
1505 | exit( 0 ); | |
1506 | } | |
1507 | if( $opt eq 'n' ){ | |
1508 | $doAutoPrint = 0; | |
1509 | } elsif( $opt eq 'a' ){ | |
1510 | $doOpenWrite = 0; | |
1511 | } else { | |
1512 | Warn( "illegal option `$opt'" ); | |
1513 | usage(); | |
1514 | exit( 1 ); | |
1515 | } | |
1516 | if( length( $arg ) ){ | |
1517 | unshift( @ARGV, "-$arg" ); | |
1518 | } | |
1519 | } | |
1520 | ||
1521 | # A singleton command may be the 1st argument when there are no options. | |
1522 | # | |
1523 | if( @Commands == 0 ){ | |
1524 | if( @ARGV == 0 ){ | |
1525 | Warn( "no script command given" ); | |
1526 | usage(); | |
1527 | exit( 1 ); | |
1528 | } | |
1529 | push( @Commands, split( "\n", shift( @ARGV ) ) ); | |
1530 | $Defined{0} = ' #1'; | |
1531 | } | |
1532 | ||
1533 | print STDERR "Files: @ARGV\n" if $useDEBUG; | |
1534 | ||
1535 | # generate leading code | |
1536 | # | |
1537 | $Func = <<'[TheEnd]'; | |
1538 | ||
1539 | # openARGV: open 1st input file | |
1540 | # | |
1541 | sub openARGV(){ | |
1542 | unshift( @ARGV, '-' ) unless @ARGV; | |
1543 | my $file = shift( @ARGV ); | |
1544 | open( ARG, "<$file" ) | |
1545 | || die( "$0: can't open $file for reading ($!)\n" ); | |
1546 | $isEOF = 0; | |
1547 | } | |
1548 | ||
1549 | # getsARGV: Read another input line into argument (default: $_). | |
1550 | # Move on to next input file, and reset EOF flag $isEOF. | |
1551 | sub getsARGV(;\$){ | |
1552 | my $argref = @_ ? shift() : \$_; | |
1553 | while( $isEOF || ! defined( $$argref = <ARG> ) ){ | |
1554 | close( ARG ); | |
1555 | return 0 unless @ARGV; | |
1556 | my $file = shift( @ARGV ); | |
1557 | open( ARG, "<$file" ) | |
1558 | || die( "$0: can't open $file for reading ($!)\n" ); | |
1559 | $isEOF = 0; | |
1560 | } | |
1561 | 1; | |
1562 | } | |
1563 | ||
1564 | # eofARGV: end-of-file test | |
1565 | # | |
1566 | sub eofARGV(){ | |
1567 | return @ARGV == 0 && ( $isEOF = eof( ARG ) ); | |
1568 | } | |
1569 | ||
1570 | # makeHandle: Generates another file handle for some file (given by its path) | |
1571 | # to be written due to a w command or an s command's w flag. | |
1572 | sub makeHandle($){ | |
1573 | my( $path ) = @_; | |
1574 | my $handle; | |
1575 | if( ! exists( $wFiles{$path} ) || $wFiles{$path} eq '' ){ | |
1576 | $handle = $wFiles{$path} = gensym(); | |
1577 | if( $doOpenWrite ){ | |
1578 | if( ! open( $handle, ">$path" ) ){ | |
1579 | die( "$0: can't open $path for writing: ($!)\n" ); | |
1580 | } | |
1581 | } | |
1582 | } else { | |
1583 | $handle = $wFiles{$path}; | |
1584 | } | |
1585 | return $handle; | |
1586 | } | |
1587 | ||
1588 | # printQ: Print queued output which is either a string or a reference | |
1589 | # to a pathname. | |
1590 | sub printQ(){ | |
1591 | for my $q ( @Q ){ | |
1592 | if( ref( $q ) ){ | |
1593 | # flush open w files so that reading this file gets it all | |
1594 | if( exists( $wFiles{$$q} ) && $wFiles{$$q} ne '' ){ | |
1595 | open( $wFiles{$$q}, ">>$$q" ); | |
1596 | } | |
1597 | # copy file to stdout: slow, but safe | |
1598 | if( open( RF, "<$$q" ) ){ | |
1599 | while( defined( my $line = <RF> ) ){ | |
1600 | print $line; | |
1601 | } | |
1602 | close( RF ); | |
1603 | } | |
1604 | } else { | |
1605 | print $q; | |
1606 | } | |
1607 | } | |
1608 | undef( @Q ); | |
1609 | } | |
1610 | ||
1611 | [TheEnd] | |
1612 | ||
1613 | # generate the sed loop | |
1614 | # | |
1615 | $Code .= <<'[TheEnd]'; | |
1616 | sub openARGV(); | |
1617 | sub getsARGV(;\$); | |
1618 | sub eofARGV(); | |
1619 | sub printQ(); | |
1620 | ||
1621 | # Run: the sed loop reading input and applying the script | |
1622 | # | |
1623 | sub Run(){ | |
1624 | my( $h, $icnt, $s, $n ); | |
1625 | # hack (not unbreakable :-/) to avoid // matching an empty string | |
1626 | my $z = "\000"; $z =~ /$z/; | |
1627 | # Initialize. | |
1628 | openARGV(); | |
1629 | $Hold = ''; | |
1630 | $CondReg = 0; | |
1631 | $doPrint = $doAutoPrint; | |
1632 | CYCLE: | |
1633 | while( getsARGV() ){ | |
1634 | chomp(); | |
1635 | $CondReg = 0; # cleared on t | |
1636 | BOS:; | |
1637 | [TheEnd] | |
1638 | ||
1639 | # parse - avoid opening files when doing s2p | |
1640 | # | |
1641 | ( $svOpenWrite, $doOpenWrite ) = ( $doOpenWrite, $svOpenWrite ) | |
1642 | if $doGenerate; | |
1643 | Parse(); | |
1644 | ( $svOpenWrite, $doOpenWrite ) = ( $doOpenWrite, $svOpenWrite ) | |
1645 | if $doGenerate; | |
1646 | ||
1647 | # append trailing code | |
1648 | # | |
1649 | $Code .= <<'[TheEnd]'; | |
1650 | EOS: if( $doPrint ){ | |
1651 | print $_, "\n"; | |
1652 | } else { | |
1653 | $doPrint = $doAutoPrint; | |
1654 | } | |
1655 | printQ() if @Q; | |
1656 | } | |
1657 | ||
1658 | exit( 0 ); | |
1659 | } | |
1660 | [TheEnd] | |
1661 | ||
1662 | ||
1663 | # append optional functions, prepend prototypes | |
1664 | # | |
1665 | my $Proto = "# prototypes\n"; | |
1666 | if( $GenKey{'l'} ){ | |
1667 | $Proto .= "sub _l();\n"; | |
1668 | $Func .= <<'[TheEnd]'; | |
1669 | # _l: l command processing | |
1670 | # | |
1671 | sub _l(){ | |
1672 | my $h = $_; | |
1673 | my $mcpl = 70; | |
1674 | # transform non printing chars into escape notation | |
1675 | $h =~ s/\\/\\\\/g; | |
1676 | if( $h =~ /[^[:print:]]/ ){ | |
1677 | $h =~ s/\a/\\a/g; | |
1678 | $h =~ s/\f/\\f/g; | |
1679 | $h =~ s/\n/\\n/g; | |
1680 | $h =~ s/\t/\\t/g; | |
1681 | $h =~ s/\r/\\r/g; | |
1682 | $h =~ s/\e/\\e/g; | |
1683 | $h =~ s/([^[:print:]])/sprintf("\\%03o", ord($1))/ge; | |
1684 | } | |
1685 | # split into lines of length $mcpl | |
1686 | while( length( $h ) > $mcpl ){ | |
1687 | my $l = substr( $h, 0, $mcpl-1 ); | |
1688 | $h = substr( $h, $mcpl ); | |
1689 | # remove incomplete \-escape from end of line | |
1690 | if( $l =~ s/(?<!\\)(\\[0-7]{0,2})$// ){ | |
1691 | $h = $1 . $h; | |
1692 | } | |
1693 | print $l, "\\\n"; | |
1694 | } | |
1695 | print "$h\$\n"; | |
1696 | } | |
1697 | ||
1698 | [TheEnd] | |
1699 | } | |
1700 | ||
1701 | if( $GenKey{'r'} ){ | |
1702 | $Proto .= "sub _r(\$);\n"; | |
1703 | $Func .= <<'[TheEnd]'; | |
1704 | # _r: r command processing: Save a reference to the pathname. | |
1705 | # | |
1706 | sub _r($){ | |
1707 | my $path = shift(); | |
1708 | push( @Q, \$path ); | |
1709 | } | |
1710 | ||
1711 | [TheEnd] | |
1712 | } | |
1713 | ||
1714 | if( $GenKey{'t'} ){ | |
1715 | $Proto .= "sub _t();\n"; | |
1716 | $Func .= <<'[TheEnd]'; | |
1717 | # _t: t command - condition register test/reset | |
1718 | # | |
1719 | sub _t(){ | |
1720 | my $res = $CondReg; | |
1721 | $CondReg = 0; | |
1722 | $res; | |
1723 | } | |
1724 | ||
1725 | [TheEnd] | |
1726 | } | |
1727 | ||
1728 | if( $GenKey{'w'} ){ | |
1729 | $Proto .= "sub _w(\$);\n"; | |
1730 | $Func .= <<'[TheEnd]'; | |
1731 | # _w: w command and s command's w flag - write to file | |
1732 | # | |
1733 | sub _w($){ | |
1734 | my $path = shift(); | |
1735 | my $handle = $wFiles{$path}; | |
1736 | if( ! $doOpenWrite && ! defined( fileno( $handle ) ) ){ | |
1737 | open( $handle, ">$path" ) | |
1738 | || die( "$0: $path: cannot open ($!)\n" ); | |
1739 | } | |
1740 | print $handle $_, "\n"; | |
1741 | } | |
1742 | ||
1743 | [TheEnd] | |
1744 | } | |
1745 | ||
1746 | $Code = $Proto . $Code; | |
1747 | ||
1748 | # magic "#n" - same as -n option | |
1749 | # | |
1750 | $doAutoPrint = 0 if substr( $Commands[0], 0, 2 ) eq '#n'; | |
1751 | ||
1752 | # eval code - check for errors | |
1753 | # | |
1754 | print "Code:\n$Code$Func" if $useDEBUG; | |
1755 | eval $Code . $Func; | |
1756 | if( $@ ){ | |
1757 | print "Code:\n$Code$Func"; | |
1758 | die( "$0: internal error - generated incorrect Perl code: $@\n" ); | |
1759 | } | |
1760 | ||
1761 | if( $doGenerate ){ | |
1762 | ||
1763 | # write full Perl program | |
1764 | # | |
1765 | ||
1766 | # bang line, declarations, prototypes | |
1767 | print <<TheEnd; | |
1768 | #!$perlpath -w | |
1769 | eval 'exec $perlpath -S \$0 \${1+"\$@"}' | |
1770 | if 0; | |
1771 | \$0 =~ s/^.*?(\\w+)\[\\.\\w+\]*\$/\$1/; | |
1772 | ||
1773 | use strict; | |
1774 | use Symbol; | |
1775 | use vars qw{ \$isEOF \$Hold \%wFiles \@Q \$CondReg | |
1776 | \$doAutoPrint \$doOpenWrite \$doPrint }; | |
1777 | \$doAutoPrint = $doAutoPrint; | |
1778 | \$doOpenWrite = $doOpenWrite; | |
1779 | TheEnd | |
1780 | ||
1781 | my $wf = "'" . join( "', '", keys( %wFiles ) ) . "'"; | |
1782 | if( $wf ne "''" ){ | |
1783 | print <<TheEnd; | |
1784 | sub makeHandle(\$); | |
1785 | for my \$p ( $wf ){ | |
1786 | exit( 1 ) unless makeHandle( \$p ); | |
1787 | } | |
1788 | TheEnd | |
1789 | } | |
1790 | ||
1791 | print $Code; | |
1792 | print "Run();\n"; | |
1793 | print $Func; | |
1794 | exit( 0 ); | |
1795 | ||
1796 | } else { | |
1797 | ||
1798 | # execute: make handles (and optionally open) all w files; run! | |
1799 | for my $p ( keys( %wFiles ) ){ | |
1800 | exit( 1 ) unless makeHandle( $p ); | |
1801 | } | |
1802 | Run(); | |
1803 | } | |
1804 | ||
1805 | ||
1806 | =head1 ENVIRONMENT | |
1807 | ||
1808 | The environment variable C<PSEDEXTBRE> may be set to extend BREs. | |
1809 | See L<"Additional Atoms">. | |
1810 | ||
1811 | =head1 DIAGNOSTICS | |
1812 | ||
1813 | =over 4 | |
1814 | ||
1815 | =item ambiguous translation for character `%s' in `y' command | |
1816 | ||
1817 | The indicated character appears twice, with different translations. | |
1818 | ||
1819 | =item `[' cannot be last in pattern | |
1820 | ||
1821 | A `[' in a BRE indicates the beginning of a I<bracket expression>. | |
1822 | ||
1823 | =item `\' cannot be last in pattern | |
1824 | ||
1825 | A `\' in a BRE is used to make the subsequent character literal. | |
1826 | ||
1827 | =item `\' cannot be last in substitution | |
1828 | ||
1829 | A `\' in a subsitution string is used to make the subsequent character literal. | |
1830 | ||
1831 | =item conflicting flags `%s' | |
1832 | ||
1833 | In an B<s> command, either the `g' flag and an n-th occurrence flag, or | |
1834 | multiple n-th occurrence flags are specified. Note that only the digits | |
1835 | `1' through `9' are permitted. | |
1836 | ||
1837 | =item duplicate label %s (first defined at %s) | |
1838 | ||
1839 | =item excess address(es) | |
1840 | ||
1841 | The command has more than the permitted number of addresses. | |
1842 | ||
1843 | =item extra characters after command (%s) | |
1844 | ||
1845 | =item illegal option `%s' | |
1846 | ||
1847 | =item improper delimiter in s command | |
1848 | ||
1849 | The BRE and substitution may not be delimited with `\' or newline. | |
1850 | ||
1851 | =item invalid address after `,' | |
1852 | ||
1853 | =item invalid backreference (%s) | |
1854 | ||
1855 | The specified backreference number exceeds the number of backreferences | |
1856 | in the BRE. | |
1857 | ||
1858 | =item invalid repeat clause `\{%s\}' | |
1859 | ||
1860 | The repeat clause does not contain a valid integer value, or pair of | |
1861 | values. | |
1862 | ||
1863 | =item malformed regex, 1st address | |
1864 | ||
1865 | =item malformed regex, 2nd address | |
1866 | ||
1867 | =item malformed regular expression | |
1868 | ||
1869 | =item malformed substitution expression | |
1870 | ||
1871 | =item malformed `y' command argument | |
1872 | ||
1873 | The first or second string of a B<y> command is syntactically incorrect. | |
1874 | ||
1875 | =item maximum less than minimum in `\{%s\}' | |
1876 | ||
1877 | =item no script command given | |
1878 | ||
1879 | There must be at least one B<-e> or one B<-f> option specifying a | |
1880 | script or script file. | |
1881 | ||
1882 | =item `\' not valid as delimiter in `y' command | |
1883 | ||
1884 | =item option -e requires an argument | |
1885 | ||
1886 | =item option -f requires an argument | |
1887 | ||
1888 | =item `s' command requires argument | |
1889 | ||
1890 | =item start of unterminated `{' | |
1891 | ||
1892 | =item string lengths in `y' command differ | |
1893 | ||
1894 | The translation table strings in a B<y> commanf must have equal lengths. | |
1895 | ||
1896 | =item undefined label `%s' | |
1897 | ||
1898 | =item unexpected `}' | |
1899 | ||
1900 | A B<}> command without a preceding B<{> command was encountered. | |
1901 | ||
1902 | =item unexpected end of script | |
1903 | ||
1904 | The end of the script was reached although a text line after a | |
1905 | B<a>, B<c> or B<i> command indicated another line. | |
1906 | ||
1907 | =item unknown command `%s' | |
1908 | ||
1909 | =item unterminated `[' | |
1910 | ||
1911 | A BRE contains an unterminated bracket expression. | |
1912 | ||
1913 | =item unterminated `\(' | |
1914 | ||
1915 | A BRE contains an unterminated backreference. | |
1916 | ||
1917 | =item `\{' without closing `\}' | |
1918 | ||
1919 | A BRE contains an unterminated bounds specification. | |
1920 | ||
1921 | =item `\)' without preceding `\(' | |
1922 | ||
1923 | =item `y' command requires argument | |
1924 | ||
1925 | =back | |
1926 | ||
1927 | =head1 EXAMPLE | |
1928 | ||
1929 | The basic material for the preceding section was generated by running | |
1930 | the sed script | |
1931 | ||
1932 | #no autoprint | |
1933 | s/^.*Warn( *"\([^"]*\)".*$/\1/ | |
1934 | t process | |
1935 | b | |
1936 | :process | |
1937 | s/$!/%s/g | |
1938 | s/$[_[:alnum:]]\{1,\}/%s/g | |
1939 | s/\\\\/\\/g | |
1940 | s/^/=item / | |
1941 | p | |
1942 | ||
1943 | on the program's own text, and piping the output into C<sort -u>. | |
1944 | ||
1945 | ||
1946 | =head1 SED SCRIPT TRANSLATION | |
1947 | ||
1948 | If this program is invoked with the name F<s2p> it will act as a | |
1949 | sed-to-Perl translator. After option processing (all other | |
1950 | arguments are ignored), a Perl program is printed on standard | |
1951 | output, which will process the input stream (as read from all | |
1952 | arguments) in the way defined by the sed script and the option setting | |
1953 | used for the translation. | |
1954 | ||
1955 | =head1 SEE ALSO | |
1956 | ||
1957 | perl(1), re_format(7) | |
1958 | ||
1959 | =head1 BUGS | |
1960 | ||
1961 | The B<l> command will show escape characters (ESC) as `C<\e>', but | |
1962 | a vertical tab (VT) in octal. | |
1963 | ||
1964 | Trailing spaces are truncated from labels in B<:>, B<t> and B<b> commands. | |
1965 | ||
1966 | The meaning of an empty regular expression (`C<//>'), as defined by B<sed>, | |
1967 | is "the last pattern used, at run time". This deviates from the Perl | |
1968 | interpretation, which will re-use the "last last successfully executed | |
1969 | regular expression". Since keeping track of pattern usage would create | |
1970 | terribly cluttered code, and differences would only appear in obscure | |
1971 | context (where other B<sed> implementations appear to deviate, too), | |
1972 | the Perl semantics was adopted. Note that common usage of this feature, | |
1973 | such as in C</abc/s//xyz/>, will work as expected. | |
1974 | ||
1975 | Collating elements (of bracket expressions in BREs) are not implemented. | |
1976 | ||
1977 | =head1 STANDARDS | |
1978 | ||
1979 | This B<sed> implementation conforms to the IEEE Std1003.2-1992 ("POSIX.2") | |
1980 | definition of B<sed>, and is compatible with the I<OpenBSD> | |
1981 | implementation, except where otherwise noted (see L<"BUGS">). | |
1982 | ||
1983 | =head1 AUTHOR | |
1984 | ||
1985 | This Perl implementation of I<sed> was written by Wolfgang Laun, | |
1986 | I<Wolfgang.Laun@alcatel.at>. | |
1987 | ||
1988 | =head1 COPYRIGHT and LICENSE | |
1989 | ||
1990 | This program is free and open software. You may use, modify, | |
1991 | distribute, and sell this program (and any modified variants) in any | |
1992 | way you wish, provided you do not restrict others from doing the same. | |
1993 | ||
1994 | =cut | |
1995 |