# (p)sed - a stream editor
# History: Aug 12 2000: Original version.
+# Mar 25 2002: Rearrange generated Perl program.
use strict;
use integer;
=cut
my %ComTab;
+my %GenKey;
#--------------------------------------------------------------------------
$ComTab{'a'}=[ 1, 'txt', \&Emit, '{ push( @Q, <<'."'TheEnd' ) }\n" ]; #ok
#--------------------------------------------------------------------------
$ComTab{'n'}=[ 2, '', \&Emit, <<'-X-' ]; #ok
{ print $_, "\n" if $doPrint;
- printQ if @Q;
+ printQ() if @Q;
$CondReg = 0;
last CYCLE unless getsARGV();
chomp();
#--------------------------------------------------------------------------
$ComTab{'N'}=[ 2, '', \&Emit, <<'-X-' ]; #ok
-{ printQ if @Q;
+{ printQ() if @Q;
$CondReg = 0;
last CYCLE unless getsARGV( $h );
chomp( $h );
#--------------------------------------------------------------------------
$ComTab{'r'}=[ 1, 'str', \&Emit, "{ _r( '-X-' ) }" ]; #ok
-### FIXME: lazy reading - big files???
=item [1addr]B<r> I<file>
# Collected and compiled script
#
-my( @Commands, %Defined, @BlockStack, %Label, $labNum, $Code );
+my( @Commands, %Defined, @BlockStack, %Label, $labNum, $Code, $Func );
+$Code = '';
##################
# Compile Time
if( defined( $path ) ){
$wFiles{$path} = '';
$code .= " _w( '$path' ) if \$s;\n";
+ $GenKey{'w'} = 1;
}
$code .= "}";
}
my $key = $1;
my $tabref = $ComTab{$key};
+ $GenKey{$key} = 1;
if( $naddr > $tabref->[0] ){
Warn( "excess address(es)", $fl );
$error++;
# generate leading code
#
- $Code = <<'[TheEnd]';
+$Func = <<'[TheEnd]';
+# openARGV: open 1st input file
+#
sub openARGV(){
unshift( @ARGV, '-' ) unless @ARGV;
my $file = shift( @ARGV );
$isEOF = 0;
}
+# getsARGV: Read another input line into argument (default: $_).
+# Move on to next input file, and reset EOF flag $isEOF.
sub getsARGV(;\$){
my $argref = @_ ? shift() : \$_;
while( $isEOF || ! defined( $$argref = <ARG> ) ){
1;
}
+# eofARGV: end-of-file test
+#
sub eofARGV(){
return @ARGV == 0 && ( $isEOF = eof( ARG ) );
}
+# makeHandle: Generates another file handle for some file (given by its path)
+# to be written due to a w command or an s command's w flag.
sub makeHandle($){
my( $path ) = @_;
my $handle;
return $handle;
}
-sub _r($){
- my $path = shift();
- push( @Q, \$path );
-}
-
-sub _l(){
- my $h = $_;
- my $mcpl = 70;
- $h =~ s/\\/\\\\/g;
- if( $h =~ /[^[:print:]]/ ){
- $h =~ s/\a/\\a/g;
- $h =~ s/\f/\\f/g;
- $h =~ s/\n/\\n/g;
- $h =~ s/\t/\\t/g;
- $h =~ s/\r/\\r/g;
- $h =~ s/\e/\\e/g;
- $h =~ s/([^[:print:]])/sprintf("\\%03o", ord($1))/ge;
- }
- while( length( $h ) > $mcpl ){
- my $l = substr( $h, 0, $mcpl-1 );
- $h = substr( $h, $mcpl );
- # remove incomplete \-escape from end of line
- if( $l =~ s/(?<!\\)(\\[0-7]{0,2})$// ){
- $h = $1 . $h;
- }
- print $l, "\\\n";
- }
- print "$h\$\n";
-}
-
-sub _w($){
- my $path = shift();
- my $handle = $wFiles{$path};
- if( ! $doOpenWrite &&
- ! defined( fileno( $handle ) ) ){
- open( $handle, ">$path" )
- || die( "$0: $path: cannot open ($!)\n" );
- }
- print $handle $_, "\n";
-}
-
-# condition register test/reset
-#
-sub _t(){
- my $res = $CondReg;
- $CondReg = 0;
- $res;
-}
-
-# printQ
-#
+# printQ: Print queued output which is either a string or a reference
+# to a pathname.
sub printQ(){
for my $q ( @Q ){
if( ref( $q ) ){
+ # flush open w files so that reading this file gets it all
if( exists( $wFiles{$$q} ) && $wFiles{$$q} ne '' ){
open( $wFiles{$$q}, ">>$$q" );
}
+ # copy file to stdout: slow, but safe
if( open( RF, "<$$q" ) ){
- my $line;
- while( defined( $line = <RF> ) ){
+ while( defined( my $line = <RF> ) ){
print $line;
}
close( RF );
undef( @Q );
}
+[TheEnd]
+
+# generate the sed loop
+#
+$Code .= <<'[TheEnd]';
+sub openARGV();
+sub getsARGV(;\$);
+sub eofARGV();
+sub printQ();
+
+# Run: the sed loop reading input and applying the script
+#
sub Run(){
my( $h, $icnt, $s, $n );
# hack (not unbreakable :-/) to avoid // matching an empty string
}
[TheEnd]
+
+# append optional functions, prepend prototypes
+#
+my $Proto = "# prototypes\n";
+if( $GenKey{'l'} ){
+ $Proto .= "sub _l();\n";
+ $Func .= <<'[TheEnd]';
+# _l: l command processing
+#
+sub _l(){
+ my $h = $_;
+ my $mcpl = 70;
+ # transform non printing chars into escape notation
+ $h =~ s/\\/\\\\/g;
+ if( $h =~ /[^[:print:]]/ ){
+ $h =~ s/\a/\\a/g;
+ $h =~ s/\f/\\f/g;
+ $h =~ s/\n/\\n/g;
+ $h =~ s/\t/\\t/g;
+ $h =~ s/\r/\\r/g;
+ $h =~ s/\e/\\e/g;
+ $h =~ s/([^[:print:]])/sprintf("\\%03o", ord($1))/ge;
+ }
+ # split into lines of length $mcpl
+ while( length( $h ) > $mcpl ){
+ my $l = substr( $h, 0, $mcpl-1 );
+ $h = substr( $h, $mcpl );
+ # remove incomplete \-escape from end of line
+ if( $l =~ s/(?<!\\)(\\[0-7]{0,2})$// ){
+ $h = $1 . $h;
+ }
+ print $l, "\\\n";
+ }
+ print "$h\$\n";
+}
+
+[TheEnd]
+}
+
+if( $GenKey{'r'} ){
+ $Proto .= "sub _r(\$);\n";
+ $Func .= <<'[TheEnd]';
+# _r: r command processing: Save a reference to the pathname.
+#
+sub _r($){
+ my $path = shift();
+ push( @Q, \$path );
+}
+
+[TheEnd]
+}
+
+if( $GenKey{'t'} ){
+ $Proto .= "sub _t();\n";
+ $Func .= <<'[TheEnd]';
+# _t: t command - condition register test/reset
+#
+sub _t(){
+ my $res = $CondReg;
+ $CondReg = 0;
+ $res;
+}
+
+[TheEnd]
+}
+
+if( $GenKey{'w'} ){
+ $Proto .= "sub _w(\$);\n";
+ $Func .= <<'[TheEnd]';
+# _w: w command and s command's w flag - write to file
+#
+sub _w($){
+ my $path = shift();
+ my $handle = $wFiles{$path};
+ if( ! $doOpenWrite && ! defined( fileno( $handle ) ) ){
+ open( $handle, ">$path" )
+ || die( "$0: $path: cannot open ($!)\n" );
+ }
+ print $handle $_, "\n";
+}
+
+[TheEnd]
+}
+
+$Code = $Proto . $Code;
+
# magic "#n" - same as -n option
#
$doAutoPrint = 0 if substr( $Commands[0], 0, 2 ) eq '#n';
# eval code - check for errors
#
-print "Code:\n$Code" if $useDEBUG;
-eval $Code;
+print "Code:\n$Code$Func" if $useDEBUG;
+eval $Code . $Func;
if( $@ ){
- print "Code:\n$Code";
+ print "Code:\n$Code$Func";
die( "$0: internal error - generated incorrect Perl code: $@\n" );
}
# write full Perl program
#
- # bang line, declarations
+ # bang line, declarations, prototypes
print <<TheEnd;
#!$perlpath -w
eval 'exec $perlpath -S \$0 \${1+"\$@"}'
}
print $Code;
- print "&Run()\n";
+ print "Run();\n";
+ print $Func;
exit( 0 );
} else {
# execute: make handles (and optionally open) all w files; run!
-
for my $p ( keys( %wFiles ) ){
exit( 1 ) unless makeHandle( $p );
}
- &Run();
+ Run();
}
projects / p5sagit/p5-mst-13.2.git / commitdiff