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