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