4 use File::Basename qw(&basename &dirname);
8 sub link { # This is a cut-down version of installperl:link().
13 CORE::link($from, $to)
15 : ($from =~ m#^/afs/# || $to =~ m#^/afs/#)
16 ? die "AFS" # okay inside eval {}
17 : die "Couldn't link $from to $to: $!\n";
21 File::Copy::copy($from, $to)
23 : warn "Couldn't copy $from to $to: $!\n";
28 # List explicitly here the variables you want Configure to
29 # generate. Metaconfig only looks for shell variables, so you
30 # have to mention them as if they were shell variables, not
31 # %Config entries. Thus you write
33 # to ensure Configure will look for $Config{startperl}.
35 # This forces PL files to create target in same directory as PL file.
36 # This is so that make depend always knows where to find PL derivatives.
39 $file = basename($0, '.PL');
40 $file .= '.com' if $^O eq 'VMS';
42 open OUT,">$file" or die "Can't create $file: $!";
44 print "Extracting $file (with variable substitutions)\n";
46 # In this section, perl variables will be expanded during extraction.
47 # You can use $Config{...} to use Configure variables.
49 print OUT <<"!GROK!THIS!";
51 eval 'exec $Config{perlpath} -S \$0 \${1+"\$@"}'
52 if \$running_under_some_shell;
55 (\$startperl = <<'/../') =~ s/\\s*\\z//;
58 (\$perlpath = <<'/../') =~ s/\\s*\\z//;
63 # In the following, perl variables are not expanded during extraction.
65 print OUT <<'!NO!SUBS!';
67 $0 =~ s/^.*?(\w+)[\.\w]*$/$1/;
69 # (p)sed - a stream editor
70 # History: Aug 12 2000: Original version.
71 # Mar 25 2002: Rearrange generated Perl program.
72 # Jul 23 2007: Fix bug in regex stripping (M.Thorland)
80 psed - a stream editor
84 psed [-an] script [file ...]
85 psed [-an] [-e script] [-f script-file] [file ...]
87 s2p [-an] [-e script] [-f script-file]
91 A stream editor reads the input stream consisting of the specified files
92 (or standard input, if none are given), processes is line by line by
93 applying a script consisting of edit commands, and writes resulting lines
94 to standard output. The filename 'C<->' may be used to read standard input.
96 The edit script is composed from arguments of B<-e> options and
97 script-files, in the given order. A single script argument may be specified
98 as the first parameter.
100 If this program is invoked with the name F<s2p>, it will act as a
101 sed-to-Perl translator. See L<"SED SCRIPT TRANSLATION">.
103 B<sed> returns an exit code of 0 on success or >0 if an error occurred.
111 A file specified as argument to the B<w> edit command is by default
112 opened before input processing starts. Using B<-a>, opening of such
113 files is delayed until the first line is actually written to the file.
115 =item B<-e> I<script>
117 The editing commands defined by I<script> are appended to the script.
118 Multiple commands must be separated by newlines.
120 =item B<-f> I<script-file>
122 Editing commands from the specified I<script-file> are read and appended
127 By default, a line is written to standard output after the editing script
128 has been applied to it. The B<-n> option suppresses automatic printing.
134 B<sed> command syntax is defined as
136 Z<> Z<> Z<> Z<>[I<address>[B<,>I<address>]][B<!>]I<function>[I<argument>]
138 with whitespace being permitted before or after addresses, and between
139 the function character and the argument. The I<address>es and the
140 address inverter (C<!>) are used to restrict the application of a
141 command to the selected line(s) of input.
143 Each command must be on a line of its own, except where noted in
146 The edit cycle performed on each input line consist of reading the line
147 (without its trailing newline character) into the I<pattern space>,
148 applying the applicable commands of the edit script, writing the final
149 contents of the pattern space and a newline to the standard output.
150 A I<hold space> is provided for saving the contents of the
151 pattern space for later use.
155 A sed address is either a line number or a pattern, which may be combined
156 arbitrarily to construct ranges. Lines are numbered across all input files.
158 Any address may be followed by an exclamation mark ('C<!>'), selecting
159 all lines not matching that address.
165 The line with the given number is selected.
169 A dollar sign (C<$>) is the line number of the last line of the input stream.
171 =item B</>I<regular expression>B</>
173 A pattern address is a basic regular expression (see
174 L<"BASIC REGULAR EXPRESSIONS">), between the delimiting character C</>.
175 Any other character except C<\> or newline may be used to delimit a
176 pattern address when the initial delimiter is prefixed with a
181 If no address is given, the command selects every line.
183 If one address is given, it selects the line (or lines) matching the
186 Two addresses select a range that begins whenever the first address
187 matches, and ends (including that line) when the second address matches.
188 If the first (second) address is a matching pattern, the second
189 address is not applied to the very same line to determine the end of
190 the range. Likewise, if the second address is a matching pattern, the
191 first address is not applied to the very same line to determine the
192 begin of another range. If both addresses are line numbers,
193 and the second line number is less than the first line number, then
194 only the first line is selected.
199 The maximum permitted number of addresses is indicated with each
200 function synopsis below.
202 The argument I<text> consists of one or more lines following the command.
203 Embedded newlines in I<text> must be preceded with a backslash. Other
204 backslashes in I<text> are deleted and the following character is taken
213 #--------------------------------------------------------------------------
214 $ComTab{'a'}=[ 1, 'txt', \&Emit, '{ push( @Q, <<'."'TheEnd' ) }\n" ]; #ok
216 =item [1addr]B<a\> I<text>
218 Write I<text> (which must start on the line following the command)
219 to standard output immediately before reading the next line
220 of input, either by executing the B<N> function or by beginning a new cycle.
224 #--------------------------------------------------------------------------
225 $ComTab{'b'}=[ 2, 'str', \&Branch, '{ goto XXX; }' ]; #ok
227 =item [2addr]B<b> [I<label>]
229 Branch to the B<:> function with the specified I<label>. If no label
230 is given, branch to the end of the script.
234 #--------------------------------------------------------------------------
235 $ComTab{'c'}=[ 2, 'txt', \&Change, <<'-X-' ]; #ok
236 { print <<'TheEnd'; } $doPrint = 0; goto EOS;
238 ### continue OK => next CYCLE;
240 =item [2addr]B<c\> I<text>
242 The line, or range of lines, selected by the address is deleted.
243 The I<text> (which must start on the line following the command)
244 is written to standard output. With an address range, this occurs at
245 the end of the range.
249 #--------------------------------------------------------------------------
250 $ComTab{'d'}=[ 2, '', \&Emit, <<'-X-' ]; #ok
255 ### continue OK => next CYCLE;
259 Deletes the pattern space and starts the next cycle.
263 #--------------------------------------------------------------------------
264 $ComTab{'D'}=[ 2, '', \&Emit, <<'-X-' ]; #ok
266 if(length($_)){ goto BOS } else { goto EOS }
269 ### continue OK => next CYCLE;
273 Deletes the pattern space through the first embedded newline or to the end.
274 If the pattern space becomes empty, a new cycle is started, otherwise
275 execution of the script is restarted.
279 #--------------------------------------------------------------------------
280 $ComTab{'g'}=[ 2, '', \&Emit, '{ $_ = $Hold };' ]; #ok
284 Replace the contents of the pattern space with the hold space.
288 #--------------------------------------------------------------------------
289 $ComTab{'G'}=[ 2, '', \&Emit, '{ $_ .= "\n"; $_ .= $Hold };' ]; #ok
293 Append a newline and the contents of the hold space to the pattern space.
297 #--------------------------------------------------------------------------
298 $ComTab{'h'}=[ 2, '', \&Emit, '{ $Hold = $_ }' ]; #ok
302 Replace the contents of the hold space with the pattern space.
306 #--------------------------------------------------------------------------
307 $ComTab{'H'}=[ 2, '', \&Emit, '{ $Hold .= "\n"; $Hold .= $_; }' ]; #ok
311 Append a newline and the contents of the pattern space to the hold space.
315 #--------------------------------------------------------------------------
316 $ComTab{'i'}=[ 1, 'txt', \&Emit, '{ print <<'."'TheEnd' }\n" ]; #ok
318 =item [1addr]B<i\> I<text>
320 Write the I<text> (which must start on the line following the command)
325 #--------------------------------------------------------------------------
326 $ComTab{'l'}=[ 2, '', \&Emit, '{ _l() }' ]; #okUTF8
330 Print the contents of the pattern space: non-printable characters are
331 shown in C-style escaped form; long lines are split and have a trailing
332 ^'C<\>' at the point of the split; the true end of a line is marked with
333 a 'C<$>'. Escapes are: '\a', '\t', '\n', '\f', '\r', '\e' for
334 BEL, HT, LF, FF, CR, ESC, respectively, and '\' followed by a three-digit
335 octal number for all other non-printable characters.
339 #--------------------------------------------------------------------------
340 $ComTab{'n'}=[ 2, '', \&Emit, <<'-X-' ]; #ok
341 { print $_, "\n" if $doPrint;
344 last CYCLE unless getsARGV();
351 If automatic printing is enabled, write the pattern space to the standard
352 output. Replace the pattern space with the next line of input. If
353 there is no more input, processing is terminated.
357 #--------------------------------------------------------------------------
358 $ComTab{'N'}=[ 2, '', \&Emit, <<'-X-' ]; #ok
361 last CYCLE unless getsARGV( $h );
369 Append a newline and the next line of input to the pattern space. If
370 there is no more input, processing is terminated.
374 #--------------------------------------------------------------------------
375 $ComTab{'p'}=[ 2, '', \&Emit, '{ print $_, "\n"; }' ]; #ok
379 Print the pattern space to the standard output. (Use the B<-n> option
380 to suppress automatic printing at the end of a cycle if you want to
381 avoid double printing of lines.)
385 #--------------------------------------------------------------------------
386 $ComTab{'P'}=[ 2, '', \&Emit, <<'-X-' ]; #ok
387 { if( /^(.*)/ ){ print $1, "\n"; } }
392 Prints the pattern space through the first embedded newline or to the end.
396 #--------------------------------------------------------------------------
397 $ComTab{'q'}=[ 1, '', \&Emit, <<'-X-' ]; #ok
398 { print $_, "\n" if $doPrint;
405 Branch to the end of the script and quit without starting a new cycle.
409 #--------------------------------------------------------------------------
410 $ComTab{'r'}=[ 1, 'str', \&Emit, "{ _r( '-X-' ) }" ]; #ok
412 =item [1addr]B<r> I<file>
414 Copy the contents of the I<file> to standard output immediately before
415 the next attempt to read a line of input. Any error encountered while
416 reading I<file> is silently ignored.
420 #--------------------------------------------------------------------------
421 $ComTab{'s'}=[ 2, 'sub', \&Emit, '' ]; #ok
423 =item [2addr]B<s/>I<regular expression>B</>I<replacement>B</>I<flags>
425 Substitute the I<replacement> string for the first substring in
426 the pattern space that matches the I<regular expression>.
427 Any character other than backslash or newline can be used instead of a
428 slash to delimit the regular expression and the replacement.
429 To use the delimiter as a literal character within the regular expression
430 and the replacement, precede the character by a backslash ('C<\>').
432 Literal newlines may be embedded in the replacement string by
433 preceding a newline with a backslash.
435 Within the replacement, an ampersand ('C<&>') is replaced by the string
436 matching the regular expression. The strings 'C<\1>' through 'C<\9>' are
437 replaced by the corresponding subpattern (see L<"BASIC REGULAR EXPRESSIONS">).
438 To get a literal 'C<&>' or 'C<\>' in the replacement text, precede it
441 The following I<flags> modify the behaviour of the B<s> command:
447 The replacement is performed for all matching, non-overlapping substrings
448 of the pattern space.
452 Replace only the n-th matching substring of the pattern space.
456 If the substitution was made, print the new value of the pattern space.
460 If the substitution was made, write the new value of the pattern space
461 to the specified file.
467 #--------------------------------------------------------------------------
468 $ComTab{'t'}=[ 2, 'str', \&Branch, '{ goto XXX if _t() }' ]; #ok
470 =item [2addr]B<t> [I<label>]
472 Branch to the B<:> function with the specified I<label> if any B<s>
473 substitutions have been made since the most recent reading of an input line
474 or execution of a B<t> function. If no label is given, branch to the end of
480 #--------------------------------------------------------------------------
481 $ComTab{'w'}=[ 2, 'str', \&Write, "{ _w( '-X-' ) }" ]; #ok
483 =item [2addr]B<w> I<file>
485 The contents of the pattern space are written to the I<file>.
489 #--------------------------------------------------------------------------
490 $ComTab{'x'}=[ 2, '', \&Emit, '{ ($Hold, $_) = ($_, $Hold) }' ]; #ok
494 Swap the contents of the pattern space and the hold space.
498 #--------------------------------------------------------------------------
499 $ComTab{'y'}=[ 2, 'tra', \&Emit, '' ]; #ok
501 =item [2addr]B<y>B</>I<string1>B</>I<string2>B</>
503 In the pattern space, replace all characters occurring in I<string1> by the
504 character at the corresponding position in I<string2>. It is possible
505 to use any character (other than a backslash or newline) instead of a
506 slash to delimit the strings. Within I<string1> and I<string2>, a
507 backslash followed by any character other than a newline is that literal
508 character, and a backslash followed by an 'n' is replaced by a newline
513 #--------------------------------------------------------------------------
514 $ComTab{'='}=[ 1, '', \&Emit, '{ print "$.\n" }' ]; #ok
518 Prints the current line number on the standard output.
522 #--------------------------------------------------------------------------
523 $ComTab{':'}=[ 0, 'str', \&Label, '' ]; #ok
525 =item [0addr]B<:> [I<label>]
527 The command specifies the position of the I<label>. It has no other effect.
531 #--------------------------------------------------------------------------
532 $ComTab{'{'}=[ 2, '', \&BeginBlock, '{' ]; #ok
533 $ComTab{'}'}=[ 0, '', \&EndBlock, ';}' ]; #ok
534 # ';' to avoid warning on empty {}-block
536 =item [2addr]B<{> [I<command>]
540 These two commands begin and end a command list. The first command may
541 be given on the same line as the opening B<{> command. The commands
542 within the list are jointly selected by the address(es) given on the
543 B<{> command (but may still have individual addresses).
547 #--------------------------------------------------------------------------
548 $ComTab{'#'}=[ 0, 'str', \&Comment, '' ]; #ok
550 =item [0addr]B<#> [I<comment>]
552 The entire line is ignored (treated as a comment). If, however, the first
553 two characters in the script are 'C<#n>', automatic printing of output is
554 suppressed, as if the B<-n> option were given on the command line.
560 use vars qw{ $isEOF $Hold %wFiles @Q $CondReg $doPrint };
562 my $useDEBUG = exists( $ENV{PSEDDEBUG} );
563 my $useEXTBRE = $ENV{PSEDEXTBRE} || '';
564 $useEXTBRE =~ s/[^<>wWyB]//g; # gawk RE's handle these
566 my $doAutoPrint = 1; # automatic printing of pattern space (-n => 0)
567 my $doOpenWrite = 1; # open w command output files at start (-a => 0)
568 my $svOpenWrite = 0; # save $doOpenWrite
570 # lower case $0 below as a VMSism. The VMS build procedure creates the
571 # s2p file traditionally in upper case on the disk. When VMS is in a
572 # case preserved or case sensitive mode, $0 will be returned in the exact
573 # case which will be on the disk, and that is not predictable at this time.
575 my $doGenerate = lc($0) eq 's2p';
577 # Collected and compiled script
579 my( @Commands, %Defined, @BlockStack, %Label, $labNum, $Code, $Func );
590 my( $msg, $loc ) = @_;
592 $loc .= ': ' if length( $loc );
593 warn( "$0: $loc$msg\n" );
598 return 'L_'.++$labNum;
601 # safeHere: create safe here delimiter and modify opcode and argument
604 my( $codref, $argref ) = @_;
606 while( $$argref =~ /^$eod$/m ){
609 $$codref =~ s/TheEnd/$eod/e;
610 $$argref .= "$eod\n";
613 # Emit: create address logic and emit command
616 my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_;
618 if( defined( $addr1 ) ){
619 if( defined( $addr2 ) ){
620 $addr1 .= $addr2 =~ /^\d+$/ ? "..$addr2" : "...$addr2";
622 $addr1 .= ' == $.' if $addr1 =~ /^\d+$/;
624 $cond = $negated ? "unless( $addr1 )\n" : "if( $addr1 )\n";
628 $Code .= "$cond$arg\n";
630 } elsif( $opcode =~ s/-X-/$arg/e ){
631 $Code .= "$cond$opcode\n";
633 } elsif( $opcode =~ /TheEnd/ ){
634 safeHere( \$opcode, \$arg );
635 $Code .= "$cond$opcode$arg";
638 $Code .= "$cond$opcode\n";
643 # Write (w command, w flag): store pathname
646 my( $addr1, $addr2, $negated, $opcode, $path, $fl ) = @_;
648 Emit( $addr1, $addr2, $negated, $opcode, $path, $fl );
652 # Label (: command): label definition
655 my( $addr1, $addr2, $negated, $opcode, $lab, $fl ) = @_;
658 if( length( $lab ) ){
660 if( ! exists( $Label{$lab} ) ){
661 $h = $Label{$lab}{name} = newLabel();
663 $h = $Label{$lab}{name};
664 if( exists( $Label{$lab}{defined} ) ){
665 my $dl = $Label{$lab}{defined};
666 Warn( "duplicate label $lab (first defined at $dl)", $fl );
670 $Label{$lab}{defined} = $fl;
676 # BeginBlock ({ command): push block start
678 sub BeginBlock($$$$$$){
679 my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_;
680 push( @BlockStack, [ $fl, $addr1, $addr2, $negated ] );
681 Emit( $addr1, $addr2, $negated, $opcode, $arg, $fl );
684 # EndBlock (} command): check proper nesting
686 sub EndBlock($$$$$$){
687 my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_;
689 my $jcom = pop( @BlockStack );
690 if( defined( $jcom ) ){
691 $rc = Emit( $addr1, $addr2, $negated, $opcode, $arg, $fl );
693 Warn( "unexpected '}'", $fl );
699 # Branch (t, b commands): check or create label, substitute default
702 my( $addr1, $addr2, $negated, $opcode, $lab, $fl ) = @_;
703 $lab =~ s/\s+//; # no spaces at end
705 if( length( $lab ) ){
706 if( ! exists( $Label{$lab} ) ){
707 $h = $Label{$lab}{name} = newLabel();
709 $h = $Label{$lab}{name};
711 push( @{$Label{$lab}{used}}, $fl );
715 $opcode =~ s/XXX/$h/e;
716 Emit( $addr1, $addr2, $negated, $opcode, '', $fl );
719 # Change (c command): is special due to range end watching
722 my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_;
723 my $kwd = $negated ? 'unless' : 'if';
724 if( defined( $addr2 ) ){
725 $addr1 .= $addr2 =~ /^\d+$/ ? "..$addr2" : "...$addr2";
727 $addr1 = '$icnt = ('.$addr1.')';
728 $opcode = 'if( $icnt =~ /E0$/ )' . $opcode;
731 $addr1 .= ' == $.' if $addr1 =~ /^\d+$/;
733 safeHere( \$opcode, \$arg );
734 $Code .= "$kwd( $addr1 ){\n $opcode$arg}\n";
739 # Comment (# command): A no-op. Who would've thought that!
742 my( $addr1, $addr2, $negated, $opcode, $arg, $fl ) = @_;
743 ### $Code .= "# $arg\n";
747 # stripRegex from the current command. If we're in the first
748 # part of s///, trailing spaces have to be kept as the initial
749 # part of the replacement string.
751 sub stripRegex($$;$){
752 my( $del, $sref, $sub ) = @_;
754 print "stripRegex:$del:$$sref:\n" if $useDEBUG;
755 while( $$sref =~ s{^(.*?)(\\*)\Q$del\E(\s*)}{}s ){
757 $regex .= $1.$sl.$del;
758 if( length( $sl ) % 2 == 0 ){
759 if( $sub && (length( $3 ) > 0) ){
760 $$sref = $3 . $$sref;
769 # stripTrans: take a <del> terminated string from y command
770 # honoring and cleaning up of \-escaped <del>'s
773 my( $del, $sref ) = @_;
775 print "stripTrans:$del:$$sref:\n" if $useDEBUG;
776 while( $$sref =~ s{^(.*?)(\\*)\Q$del\E}{}s ){
779 if( length( $sl ) % 2 == 0 ){
790 # makey - construct Perl y/// from sed y///
793 my( $fr, $to, $fl ) = @_;
796 # Ensure that any '-' is up front.
797 # Diagnose duplicate contradicting mappings
799 for( my $i = 0; $i < length($fr); $i++ ){
800 my $fc = substr($fr,$i,1);
801 my $tc = substr($to,$i,1);
802 if( exists( $tr{$fc} ) && $tr{$fc} ne $tc ){
803 Warn( "ambiguous translation for character '$fc' in 'y' command",
810 if( exists( $tr{'-'} ) ){
811 ( $fr, $to ) = ( '-', $tr{'-'} );
816 # might just as well sort it...
817 for my $fc ( sort keys( %tr ) ){
821 # make embedded delimiters and newlines safe
822 $fr =~ s/([{}])/\$1/g;
823 $to =~ s/([{}])/\$1/g;
826 return $error ? undef() : "{ y{$fr}{$to}; }";
830 # makes - construct Perl s/// from sed s///
833 my( $regex, $subst, $path, $global, $print, $nmatch, $fl ) = @_;
835 # make embedded newlines safe
836 $regex =~ s/\n/\\n/g;
837 $subst =~ s/\n/\\n/g;
842 if( length( $nmatch ) ){
845 while( --\$n && ( \$s = m ${regex}g ) ){}
846 \$s = ( substr( \$_, pos() ) =~ s ${regex}${subst}s ) if \$s;
851 { \$s = s ${regex}${subst}s${global};
856 $code .= ' print $_, "\n" if $s;'."\n";
858 if( defined( $path ) ){
860 $code .= " _w( '$path' ) if \$s;\n";
866 =head1 BASIC REGULAR EXPRESSIONS
868 A I<Basic Regular Expression> (BRE), as defined in POSIX 1003.2, consists
869 of I<atoms>, for matching parts of a string, and I<bounds>, specifying
870 repetitions of a preceding atom.
874 The possible atoms of a BRE are: B<.>, matching any single character;
875 B<^> and B<$>, matching the null string at the beginning or end
876 of a string, respectively; a I<bracket expressions>, enclosed
877 in B<[> and B<]> (see below); and any single character with no
878 other significance (matching that character). A B<\> before one
879 of: B<.>, B<^>, B<$>, B<[>, B<*>, B<\>, matching the character
880 after the backslash. A sequence of atoms enclosed in B<\(> and B<\)>
881 becomes an atom and establishes the target for a I<backreference>,
882 consisting of the substring that actually matches the enclosed atoms.
883 Finally, B<\> followed by one of the digits B<0> through B<9> is a
886 A B<^> that is not first, or a B<$> that is not last does not have
887 a special significance and need not be preceded by a backslash to
888 become literal. The same is true for a B<]>, that does not terminate
889 a bracket expression.
891 An unescaped backslash cannot be last in a BRE.
895 The BRE bounds are: B<*>, specifying 0 or more matches of the preceding
896 atom; B<\{>I<count>B<\}>, specifying that many repetitions;
897 B<\{>I<minimum>B<,\}>, giving a lower limit; and
898 B<\{>I<minimum>B<,>I<maximum>B<\}> finally defines a lower and upper
901 A bound appearing as the first item in a BRE is taken literally.
903 =head2 Bracket Expressions
905 A I<bracket expression> is a list of characters, character ranges
906 and character classes enclosed in B<[> and B<]> and matches any
907 single character from the represented set of characters.
909 A character range is written as two characters separated by B<-> and
910 represents all characters (according to the character collating sequence)
911 that are not less than the first and not greater than the second.
912 (Ranges are very collating-sequence-dependent, and portable programs
913 should avoid relying on them.)
915 A character class is one of the class names
922 enclosed in B<[:> and B<:]> and represents the set of characters
923 as defined in ctype(3).
925 If the first character after B<[> is B<^>, the sense of matching is
928 To include a literal 'C<^>', place it anywhere else but first. To
929 include a literal 'C<]>' place it first or immediately after an
930 initial B<^>. To include a literal 'C<->' make it the first (or
931 second after B<^>) or last character, or the second endpoint of
934 The special bracket expression constructs C<[[:E<lt>:]]> and C<[[:E<gt>:]]>
935 match the null string at the beginning and end of a word respectively.
936 (Note that neither is identical to Perl's '\b' atom.)
938 =head2 Additional Atoms
940 Since some sed implementations provide additional regular expression
941 atoms (not defined in POSIX 1003.2), B<psed> is capable of translating
942 the following backslash escapes:
946 =item B<\E<lt>> This is the same as C<[[:E<gt>:]]>.
948 =item B<\E<gt>> This is the same as C<[[:E<lt>:]]>.
950 =item B<\w> This is an abbreviation for C<[[:alnum:]_]>.
952 =item B<\W> This is an abbreviation for C<[^[:alnum:]_]>.
954 =item B<\y> Match the empty string at a word boundary.
956 =item B<\B> Match the empty string between any two either word or non-word characters.
960 To enable this feature, the environment variable PSEDEXTBRE must be set
961 to a string containing the requested characters, e.g.:
962 C<PSEDEXTBRE='E<lt>E<gt>wW'>.
967 # bre2p - convert BRE to Perl RE
970 my( $pref, $ic ) = @_;
971 $ic < length($$pref)-1 ? substr( $$pref, $ic+1, 1 ) : '';
975 my( $del, $pat, $fl ) = @_;
977 $led =~ tr/{([</})]>/;
978 $led = '' if $led eq $del;
980 $pat = substr( $pat, 1, length($pat) - 2 );
985 for( my $ic = 0; $ic < length( $pat ); $ic++ ){
986 my $c = substr( $pat, $ic, 1 );
988 ### backslash escapes
989 my $nc = peek($pat,$ic);
991 Warn( "'\\' cannot be last in pattern", $fl );
995 if( $nc eq $del ){ ## \<pattern del> => \<pattern del>
998 } elsif( $nc =~ /([[.*\\n])/ ){
999 ## check for \-escaped magics and \n:
1000 ## \[ \. \* \\ \n stay as they are
1003 } elsif( $nc eq '(' ){ ## \( => (
1007 } elsif( $nc eq ')' ){ ## \) => )
1011 Warn( "unmatched '\\)'", $fl );
1016 } elsif( $nc eq '{' ){ ## repetition factor \{<i>[,[<j>]]\}
1017 my $endpos = index( $pat, '\\}', $ic );
1019 Warn( "unmatched '\\{'", $fl );
1022 my $rep = substr( $pat, $ic+1, $endpos-($ic+1) );
1025 if( $res =~ /^\^?$/ ){
1026 $res .= "\\{$rep\}";
1027 } elsif( $rep =~ /^(\d+)(,?)(\d*)?$/ ){
1031 if( length( $max ) ){
1033 Warn( "maximum less than minimum in '\\{$rep\\}'",
1041 if( $min == 0 && $max eq '1' ){
1043 } elsif( $min == 1 && "$com$max" eq ',' ){
1045 } elsif( $min == 0 && "$com$max" eq ',' ){
1048 $res .= "{$min$com$max}";
1051 Warn( "invalid repeat clause '\\{$rep\\}'", $fl );
1055 } elsif( $nc =~ /^[1-9]$/ ){
1056 ## \1 .. \9 => \1 .. \9, but check for a following digit
1057 if( $nc > $backref ){
1058 Warn( "invalid backreference ($nc)", $fl );
1062 if( peek($pat,$ic) =~ /[0-9]/ ){
1066 } elsif( $useEXTBRE && ( $nc =~ /[$useEXTBRE]/ ) ){
1067 ## extensions - at most <>wWyB - not in POSIX
1068 if( $nc eq '<' ){ ## \< => \b(?=\w), be precise
1069 $res .= '\\b(?<=\\W)';
1070 } elsif( $nc eq '>' ){ ## \> => \b(?=\W), be precise
1071 $res .= '\\b(?=\\W)';
1072 } elsif( $nc eq 'y' ){ ## \y => \b
1074 } else { ## \B, \w, \W remain the same
1077 } elsif( $nc eq $led ){
1078 ## \<closing bracketing-delimiter> - keep '\'
1081 } else { ## \ <char> => <char> ("as if '\' were not present")
1085 } elsif( $c eq '.' ){ ## . => .
1088 } elsif( $c eq '*' ){ ## * => * but \* if there's nothing preceding it
1089 if( $res =~ /^\^?$/ ){
1091 } elsif( substr( $res, -1, 1 ) ne '*' ){
1095 } elsif( $c eq '[' ){
1096 ## parse []: [^...] [^]...] [-...]
1098 if( peek($pat,$ic) eq '^' ){
1102 my $nc = peek($pat,$ic);
1103 if( $nc eq ']' || $nc eq '-' ){
1107 # check that [ is not trailing
1108 if( $ic >= length( $pat ) - 1 ){
1109 Warn( "unmatched '['", $fl );
1112 # look for [:...:] and x-y
1113 my $rstr = substr( $pat, $ic+1 );
1114 if( $rstr =~ /^((?:\[:\(\w+|[><]\):\]|[^]-](?:-[^]])?)*)/ ){
1116 $ic += length( $cnt );
1117 $cnt =~ s/([\\\$])/\\$1/g; # '\', '$' are magic in Perl []
1118 # try some simplifications
1120 if( $red =~ s/0-9// ){
1122 if( $red =~ s/A-Z// && $red =~ s/a-z// && $red =~ s/_// ){
1128 # POSIX 1003.2 has this (optional) for begin/end word
1129 $add = '\\b(?=\\W)' if $add eq '[[:<:]]';
1130 $add = '\\b(?<=\\W)' if $add eq '[[:>:]]';
1134 ## may have a trailing '-' before ']'
1135 if( $ic < length($pat) - 1 &&
1136 substr( $pat, $ic+1 ) =~ /^(-?])/ ){
1137 $ic += length( $1 );
1139 # another simplification
1140 $add =~ s/^\[(\^?)(\\[dw])]$/ $1 eq '^' ? uc($2) : $2 /e;
1143 Warn( "unmatched '['", $fl );
1147 } elsif( $c eq $led ){ ## unescaped <closing bracketing-delimiter>
1150 } elsif( $c eq ']' ){ ## unmatched ] is not magic
1153 } elsif( $c =~ /[|+?{}()]/ ){ ## not magic in BRE, but in Perl: \-quote
1156 } elsif( $c eq '^' ){ ## not magic unless 1st, but in Perl: \-quote
1157 $res .= length( $res ) ? '\\^' : '^';
1159 } elsif( $c eq '$' ){ ## not magic unless last, but in Perl: \-quote
1160 $res .= $ic == length( $pat ) - 1 ? '$' : '\\$';
1168 Warn( "unmatched '\\('", $fl );
1172 # final cleanup: eliminate raw HTs
1174 return $del . $res . ( $led ? $led : $del );
1179 # sub2p - convert sed substitution to Perl substitution
1182 my( $del, $subst, $fl ) = @_;
1184 $led =~ tr/{([</})]>/;
1185 $led = '' if $led eq $del;
1187 $subst = substr( $subst, 1, length($subst) - 2 );
1190 for( my $ic = 0; $ic < length( $subst ); $ic++ ){
1191 my $c = substr( $subst, $ic, 1 );
1193 ### backslash escapes
1194 my $nc = peek($subst,$ic);
1196 Warn( "'\\' cannot be last in substitution", $fl );
1200 if( $nc =~ /[\\$del$led]/ ){ ## \ and delimiter
1202 } elsif( $nc =~ /[1-9]/ ){ ## \1 - \9 => ${1} - ${9}
1203 $res .= '${' . $nc . '}';
1204 } else { ## everything else (includes &): omit \
1207 } elsif( $c eq '&' ){ ## & => $&
1209 } elsif( $c =~ /[\$\@$led]/ ){ ## magic in Perl's substitution string
1216 # final cleanup: eliminate raw HTs
1218 return ( $led ? $del : $led ) . $res . ( $led ? $led : $del );
1224 my( $pdef, $pfil, $plin );
1225 for( my $icom = 0; $icom < @Commands; $icom++ ){
1226 my $cmd = $Commands[$icom];
1227 print "Parse:$cmd:\n" if $useDEBUG;
1229 next unless length( $cmd );
1231 if( exists( $Defined{$icom} ) ){
1232 $pdef = $Defined{$icom};
1233 if( $pdef =~ /^ #(\d+)/ ){
1234 $pfil = 'expression #';
1243 my $fl = "$pfil$plin";
1245 # insert command as comment in gnerated code
1247 $Code .= "# $cmd\n" if $doGenerate;
1251 my( $negated, $naddr, $addr1, $addr2 );
1253 if( $cmd =~ s/^(\d+)\s*// ){
1254 $addr1 = "$1"; $naddr++;
1255 } elsif( $cmd =~ s/^\$\s*// ){
1256 $addr1 = 'eofARGV()'; $naddr++;
1257 } elsif( $cmd =~ s{^(/)}{} || $cmd =~ s{^\\(.)}{} ){
1259 my $regex = stripRegex( $del, \$cmd );
1260 if( defined( $regex ) ){
1261 $addr1 = 'm '.bre2p( $del, $regex, $fl ).'s';
1264 Warn( "malformed regex, 1st address", $fl );
1269 if( defined( $addr1 ) && $cmd =~ s/,\s*// ){
1270 if( $cmd =~ s/^(\d+)\s*// ){
1271 $addr2 = "$1"; $naddr++;
1272 } elsif( $cmd =~ s/^\$\s*// ){
1273 $addr2 = 'eofARGV()'; $naddr++;
1274 } elsif( $cmd =~ s{^(/)}{} || $cmd =~ s{^\\(.)}{} ){
1276 my $regex = stripRegex( $del, \$cmd );
1277 if( defined( $regex ) ){
1278 $addr2 = 'm '. bre2p( $del, $regex, $fl ).'s';
1281 Warn( "malformed regex, 2nd address", $fl );
1286 Warn( "invalid address after ','", $fl );
1292 # address modifier '!'
1294 $negated = $cmd =~ s/^!\s*//;
1295 if( defined( $addr1 ) ){
1296 print "Parse: addr1=$addr1" if $useDEBUG;
1297 if( defined( $addr2 ) ){
1298 print ", addr2=$addr2 " if $useDEBUG;
1299 # both numeric and addr1 > addr2 => eliminate addr2
1300 undef( $addr2 ) if $addr1 =~ /^\d+$/ &&
1301 $addr2 =~ /^\d+$/ && $addr1 > $addr2;
1304 print 'negated' if $useDEBUG && $negated;
1305 print " command:$cmd\n" if $useDEBUG;
1309 if( $cmd !~ s/^([:#={}abcdDgGhHilnNpPqrstwxy])\s*// ){
1310 my $h = substr( $cmd, 0, 1 );
1311 Warn( "unknown command '$h'", $fl );
1317 my $tabref = $ComTab{$key};
1319 if( $naddr > $tabref->[0] ){
1320 Warn( "excess address(es)", $fl );
1326 if( $tabref->[1] eq 'str' ){
1327 # take remainder - don't care if it is empty
1331 } elsif( $tabref->[1] eq 'txt' ){
1333 my $goon = $cmd =~ /(.*)\\$/;
1335 Warn( "extra characters after command ($cmd)", $fl );
1340 if( $icom > $#Commands ){
1341 Warn( "unexpected end of script", $fl );
1345 $cmd = $Commands[$icom];
1346 $Code .= "# $cmd\n" if $doGenerate;
1347 $goon = $cmd =~ s/\\$//;
1348 $cmd =~ s/\\(.)/$1/g;
1349 $arg .= "\n" if length( $arg );
1352 $arg .= "\n" if length( $arg );
1355 } elsif( $tabref->[1] eq 'sub' ){
1357 if( ! length( $cmd ) ){
1358 Warn( "'s' command requires argument", $fl );
1362 if( $cmd =~ s{^([^\\\n])}{} ){
1364 my $regex = stripRegex( $del, \$cmd, "s" );
1365 if( ! defined( $regex ) ){
1366 Warn( "malformed regular expression", $fl );
1370 $regex = bre2p( $del, $regex, $fl );
1372 # a trailing \ indicates embedded NL (in replacement string)
1373 while( $cmd =~ s/(?<!\\)\\$/\n/ ){
1375 if( $icom > $#Commands ){
1376 Warn( "unexpected end of script", $fl );
1380 $cmd .= $Commands[$icom];
1381 $Code .= "# $Commands[$icom]\n" if $doGenerate;
1384 my $subst = stripRegex( $del, \$cmd );
1385 if( ! defined( $regex ) ){
1386 Warn( "malformed substitution expression", $fl );
1390 $subst = sub2p( $del, $subst, $fl );
1392 # parse s/// modifier: g|p|0-9|w <file>
1393 my( $global, $nmatch, $print, $write ) =
1394 ( '', '', 0, undef );
1395 while( $cmd =~ s/^([gp0-9])// ){
1396 $1 eq 'g' ? ( $global = 'g' ) :
1397 $1 eq 'p' ? ( $print = $1 ) : ( $nmatch .= $1 );
1399 $write = $1 if $cmd =~ s/w\s*(.*)$//;
1400 ### $nmatch =~ s/^(\d)\1*$/$1/; ### may be dangerous?
1401 if( $global && length( $nmatch ) || length( $nmatch ) > 1 ){
1402 Warn( "conflicting flags '$global$nmatch'", $fl );
1407 $arg = makes( $regex, $subst,
1408 $write, $global, $print, $nmatch, $fl );
1409 if( ! defined( $arg ) ){
1415 Warn( "improper delimiter in s command", $fl );
1420 } elsif( $tabref->[1] eq 'tra' ){
1422 # a trailing \ indicates embedded newline
1423 while( $cmd =~ s/(?<!\\)\\$/\n/ ){
1425 if( $icom > $#Commands ){
1426 Warn( "unexpected end of script", $fl );
1430 $cmd .= $Commands[$icom];
1431 $Code .= "# $Commands[$icom]\n" if $doGenerate;
1433 if( ! length( $cmd ) ){
1434 Warn( "'y' command requires argument", $fl );
1438 my $d = substr( $cmd, 0, 1 ); $cmd = substr( $cmd, 1 );
1440 Warn( "'\\' not valid as delimiter in 'y' command", $fl );
1444 my $fr = stripTrans( $d, \$cmd );
1445 if( ! defined( $fr ) || ! length( $cmd ) ){
1446 Warn( "malformed 'y' command argument", $fl );
1450 my $to = stripTrans( $d, \$cmd );
1451 if( ! defined( $to ) ){
1452 Warn( "malformed 'y' command argument", $fl );
1456 if( length($fr) != length($to) ){
1457 Warn( "string lengths in 'y' command differ", $fl );
1461 if( ! defined( $arg = makey( $fr, $to, $fl ) ) ){
1468 # $cmd must be now empty - exception is {
1469 if( $cmd !~ /^\s*$/ ){
1471 # dirty hack to process command on '{' line
1472 $Commands[$icom--] = $cmd;
1474 Warn( "extra characters after command ($cmd)", $fl );
1482 if( &{$tabref->[2]}( $addr1, $addr2, $negated,
1483 $tabref->[3], $arg, $fl ) ){
1488 while( @BlockStack ){
1489 my $bl = pop( @BlockStack );
1490 Warn( "start of unterminated '{'", $bl );
1494 for my $lab ( keys( %Label ) ){
1495 if( ! exists( $Label{$lab}{defined} ) ){
1496 for my $used ( @{$Label{$lab}{used}} ){
1497 Warn( "undefined label '$lab'", $used );
1503 exit( 1 ) if $error;
1512 print STDERR "Usage: sed [-an] command [file...]\n";
1513 print STDERR " [-an] [-e command] [-f script-file] [file...]\n";
1517 # Here we go again...
1520 while( @ARGV && $ARGV[0] =~ /^-(.)(.*)$/ ){
1525 if( length( $arg ) ){
1526 push( @Commands, split( "\n", $arg ) );
1528 push( @Commands, shift( @ARGV ) );
1530 Warn( "option -e requires an argument" );
1535 $Defined{$#Commands} = " #$expr";
1540 if( length( $arg ) ){
1543 $path = shift( @ARGV );
1545 Warn( "option -f requires an argument" );
1549 my $fst = $#Commands + 1;
1550 open( SCRIPT, "<$path" ) || die( "$0: $path: could not open ($!)\n" );
1552 while( defined( $cmd = <SCRIPT> ) ){
1554 push( @Commands, $cmd );
1557 if( $#Commands >= $fst ){
1558 $Defined{$fst} = "$path";
1562 if( $opt eq '-' && $arg eq '' ){
1565 if( $opt eq 'h' || $opt eq '?' ){
1571 } elsif( $opt eq 'a' ){
1574 Warn( "illegal option '$opt'" );
1578 if( length( $arg ) ){
1579 unshift( @ARGV, "-$arg" );
1583 # A singleton command may be the 1st argument when there are no options.
1585 if( @Commands == 0 ){
1587 Warn( "no script command given" );
1591 push( @Commands, split( "\n", shift( @ARGV ) ) );
1592 $Defined{0} = ' #1';
1595 print STDERR "Files: @ARGV\n" if $useDEBUG;
1597 # generate leading code
1599 $Func = <<'[TheEnd]';
1601 # openARGV: open 1st input file
1604 unshift( @ARGV, '-' ) unless @ARGV;
1605 my $file = shift( @ARGV );
1606 open( ARG, "<$file" )
1607 || die( "$0: can't open $file for reading ($!)\n" );
1611 # getsARGV: Read another input line into argument (default: $_).
1612 # Move on to next input file, and reset EOF flag $isEOF.
1614 my $argref = @_ ? shift() : \$_;
1615 while( $isEOF || ! defined( $$argref = <ARG> ) ){
1617 return 0 unless @ARGV;
1618 my $file = shift( @ARGV );
1619 open( ARG, "<$file" )
1620 || die( "$0: can't open $file for reading ($!)\n" );
1626 # eofARGV: end-of-file test
1629 return @ARGV == 0 && ( $isEOF = eof( ARG ) );
1632 # makeHandle: Generates another file handle for some file (given by its path)
1633 # to be written due to a w command or an s command's w flag.
1637 if( ! exists( $wFiles{$path} ) || $wFiles{$path} eq '' ){
1638 $handle = $wFiles{$path} = gensym();
1640 if( ! open( $handle, ">$path" ) ){
1641 die( "$0: can't open $path for writing: ($!)\n" );
1645 $handle = $wFiles{$path};
1650 # printQ: Print queued output which is either a string or a reference
1655 # flush open w files so that reading this file gets it all
1656 if( exists( $wFiles{$$q} ) && $wFiles{$$q} ne '' ){
1657 open( $wFiles{$$q}, ">>$$q" );
1659 # copy file to stdout: slow, but safe
1660 if( open( RF, "<$$q" ) ){
1661 while( defined( my $line = <RF> ) ){
1675 # generate the sed loop
1677 $Code .= <<'[TheEnd]';
1683 # Run: the sed loop reading input and applying the script
1686 my( $h, $icnt, $s, $n );
1687 # hack (not unbreakable :-/) to avoid // matching an empty string
1688 my $z = "\000"; $z =~ /$z/;
1693 $doPrint = $doAutoPrint;
1695 while( getsARGV() ){
1697 $CondReg = 0; # cleared on t
1701 # parse - avoid opening files when doing s2p
1703 ( $svOpenWrite, $doOpenWrite ) = ( $doOpenWrite, $svOpenWrite )
1706 ( $svOpenWrite, $doOpenWrite ) = ( $doOpenWrite, $svOpenWrite )
1709 # append trailing code
1711 $Code .= <<'[TheEnd]';
1712 EOS: if( $doPrint ){
1715 $doPrint = $doAutoPrint;
1725 # append optional functions, prepend prototypes
1727 my $Proto = "# prototypes\n";
1729 $Proto .= "sub _l();\n";
1730 $Func .= <<'[TheEnd]';
1731 # _l: l command processing
1736 # transform non printing chars into escape notation
1738 if( $h =~ /[^[:print:]]/ ){
1745 $h =~ s/([^[:print:]])/sprintf("\\%03o", ord($1))/ge;
1747 # split into lines of length $mcpl
1748 while( length( $h ) > $mcpl ){
1749 my $l = substr( $h, 0, $mcpl-1 );
1750 $h = substr( $h, $mcpl );
1751 # remove incomplete \-escape from end of line
1752 if( $l =~ s/(?<!\\)(\\[0-7]{0,2})$// ){
1764 $Proto .= "sub _r(\$);\n";
1765 $Func .= <<'[TheEnd]';
1766 # _r: r command processing: Save a reference to the pathname.
1777 $Proto .= "sub _t();\n";
1778 $Func .= <<'[TheEnd]';
1779 # _t: t command - condition register test/reset
1791 $Proto .= "sub _w(\$);\n";
1792 $Func .= <<'[TheEnd]';
1793 # _w: w command and s command's w flag - write to file
1797 my $handle = $wFiles{$path};
1798 if( ! $doOpenWrite && ! defined( fileno( $handle ) ) ){
1799 open( $handle, ">$path" )
1800 || die( "$0: $path: cannot open ($!)\n" );
1802 print $handle $_, "\n";
1808 $Code = $Proto . $Code;
1810 # magic "#n" - same as -n option
1812 $doAutoPrint = 0 if substr( $Commands[0], 0, 2 ) eq '#n';
1814 # eval code - check for errors
1816 print "Code:\n$Code$Func" if $useDEBUG;
1819 print "Code:\n$Code$Func";
1820 die( "$0: internal error - generated incorrect Perl code: $@\n" );
1825 # write full Perl program
1828 # bang line, declarations, prototypes
1831 eval 'exec $perlpath -S \$0 \${1+"\$@"}'
1833 \$0 =~ s/^.*?(\\w+)\[\\.\\w+\]*\$/\$1/;
1837 use vars qw{ \$isEOF \$Hold \%wFiles \@Q \$CondReg
1838 \$doAutoPrint \$doOpenWrite \$doPrint };
1839 \$doAutoPrint = $doAutoPrint;
1840 \$doOpenWrite = $doOpenWrite;
1843 my $wf = "'" . join( "', '", keys( %wFiles ) ) . "'";
1848 exit( 1 ) unless makeHandle( \$p );
1860 # execute: make handles (and optionally open) all w files; run!
1861 for my $p ( keys( %wFiles ) ){
1862 exit( 1 ) unless makeHandle( $p );
1870 The environment variable C<PSEDEXTBRE> may be set to extend BREs.
1871 See L<"Additional Atoms">.
1877 =item ambiguous translation for character '%s' in 'y' command
1879 The indicated character appears twice, with different translations.
1881 =item '[' cannot be last in pattern
1883 A '[' in a BRE indicates the beginning of a I<bracket expression>.
1885 =item '\' cannot be last in pattern
1887 A '\' in a BRE is used to make the subsequent character literal.
1889 =item '\' cannot be last in substitution
1891 A '\' in a substitution string is used to make the subsequent character literal.
1893 =item conflicting flags '%s'
1895 In an B<s> command, either the 'g' flag and an n-th occurrence flag, or
1896 multiple n-th occurrence flags are specified. Note that only the digits
1897 ^'1' through '9' are permitted.
1899 =item duplicate label %s (first defined at %s)
1901 =item excess address(es)
1903 The command has more than the permitted number of addresses.
1905 =item extra characters after command (%s)
1907 =item illegal option '%s'
1909 =item improper delimiter in s command
1911 The BRE and substitution may not be delimited with '\' or newline.
1913 =item invalid address after ','
1915 =item invalid backreference (%s)
1917 The specified backreference number exceeds the number of backreferences
1920 =item invalid repeat clause '\{%s\}'
1922 The repeat clause does not contain a valid integer value, or pair of
1925 =item malformed regex, 1st address
1927 =item malformed regex, 2nd address
1929 =item malformed regular expression
1931 =item malformed substitution expression
1933 =item malformed 'y' command argument
1935 The first or second string of a B<y> command is syntactically incorrect.
1937 =item maximum less than minimum in '\{%s\}'
1939 =item no script command given
1941 There must be at least one B<-e> or one B<-f> option specifying a
1942 script or script file.
1944 =item '\' not valid as delimiter in 'y' command
1946 =item option -e requires an argument
1948 =item option -f requires an argument
1950 =item 's' command requires argument
1952 =item start of unterminated '{'
1954 =item string lengths in 'y' command differ
1956 The translation table strings in a B<y> command must have equal lengths.
1958 =item undefined label '%s'
1960 =item unexpected '}'
1962 A B<}> command without a preceding B<{> command was encountered.
1964 =item unexpected end of script
1966 The end of the script was reached although a text line after a
1967 B<a>, B<c> or B<i> command indicated another line.
1969 =item unknown command '%s'
1971 =item unterminated '['
1973 A BRE contains an unterminated bracket expression.
1975 =item unterminated '\('
1977 A BRE contains an unterminated backreference.
1979 =item '\{' without closing '\}'
1981 A BRE contains an unterminated bounds specification.
1983 =item '\)' without preceding '\('
1985 =item 'y' command requires argument
1991 The basic material for the preceding section was generated by running
1995 s/^.*Warn( *"\([^"]*\)".*$/\1/
2000 s/$[_[:alnum:]]\{1,\}/%s/g
2005 on the program's own text, and piping the output into C<sort -u>.
2008 =head1 SED SCRIPT TRANSLATION
2010 If this program is invoked with the name F<s2p> it will act as a
2011 sed-to-Perl translator. After option processing (all other
2012 arguments are ignored), a Perl program is printed on standard
2013 output, which will process the input stream (as read from all
2014 arguments) in the way defined by the sed script and the option setting
2015 used for the translation.
2019 perl(1), re_format(7)
2023 The B<l> command will show escape characters (ESC) as 'C<\e>', but
2024 a vertical tab (VT) in octal.
2026 Trailing spaces are truncated from labels in B<:>, B<t> and B<b> commands.
2028 The meaning of an empty regular expression ('C<//>'), as defined by B<sed>,
2029 is "the last pattern used, at run time". This deviates from the Perl
2030 interpretation, which will re-use the "last last successfully executed
2031 regular expression". Since keeping track of pattern usage would create
2032 terribly cluttered code, and differences would only appear in obscure
2033 context (where other B<sed> implementations appear to deviate, too),
2034 the Perl semantics was adopted. Note that common usage of this feature,
2035 such as in C</abc/s//xyz/>, will work as expected.
2037 Collating elements (of bracket expressions in BREs) are not implemented.
2041 This B<sed> implementation conforms to the IEEE Std1003.2-1992 ("POSIX.2")
2042 definition of B<sed>, and is compatible with the I<OpenBSD>
2043 implementation, except where otherwise noted (see L<"BUGS">).
2047 This Perl implementation of I<sed> was written by Wolfgang Laun,
2048 I<Wolfgang.Laun@alcatel.at>.
2050 =head1 COPYRIGHT and LICENSE
2052 This program is free and open software. You may use, modify,
2053 distribute, and sell this program (and any modified variants) in any
2054 way you wish, provided you do not restrict others from doing the same.
2060 close OUT or die "Can't close $file: $!";
2061 chmod 0755, $file or die "Can't reset permissions for $file: $!\n";
2063 print "Linking $file to psed.\n";
2064 if (defined $Config{d_link}) {
2067 unshift @INC, '../lib';
2069 File::Copy::syscopy('s2p', 'psed');
2071 exec("$Config{'eunicefix'} $file") if $Config{'eunicefix'} ne ':';