On 04/12/06, Eduardo Vieira <[EMAIL PROTECTED]> wrote:
Hello users, does anybody have a Python or Perl script to extract parts from a
.ly file and save them into a different file?
It is not pretty and it doesn't to a great deal of syntax checking but
below is a perl script I've just thrown together which extract the
parts as you require. It should pick out things like 'soprano' while
ignoring things like '\soprano'. You should save it in a file called
ly-extract and call it with:
$ ly-extract infile.ly outfile.ly label
where label is soprano, alto, etc.
I don't know how perl works with Windows, but I would guess that you
would need to change the first line in some way.
Regards,
Joe
----------------------------
#!/usr/bin/perl
# ly-extract
#
# Extract a named section from a lilypond file
use strict;
my($fin,$fout,$label)[EMAIL PROTECTED];
if (!$label) {
print "Please supply input file, output file and label\n";
exit 0;
}
open(FIN,'<',$fin) or die "Cannot find input file";
open(FOUT,'>',$fout) or die "Cannot open output file";
my($line);
my($notfound)=1;
# Find start of the required block
while($notfound and chomp($line=<FIN>)) {
# This will match:
# $label
# $label =
# $label = {
# $label = { <stuff>
# but it will ignore completely any mistakes, such as
# $label {
# $label = <stuff>
if ($line =~ /((?<!\S)$label\s*(?:(=)\s*(?:({)(.*))?)?)$/) {
$notfound=0;
$line=$1; # Only use relevant part
}
}
# This will now check to see if the opening { has been found
$notfound=1;
# Keep track of how many parentheses are open
# Counting { and << together
# Badly matched brackets will really mess this up
my($parcount)=0;
# Find the rest of the block and write it out to the output file
while ($line and ($notfound or $parcount!=0)) {
if ($line=~/^(.*)({|}|<<|>>)(.*)/) {
print FOUT $1;
if ($2 eq '{' or $2 eq '<<') {
$notfound=0;
$parcount++;
print FOUT $2;
} elsif ($2 eq '}' or $2 eq '>>') {
$parcount--;
print FOUT $2;
if ($parcount < 0) {
die "Something has gone horribly wrong!";
}
}
$line=$3;
} else {
chomp($line);
print FOUT $line;
$line='';
}
if (!$line) {
print FOUT "\n";
$line=<FIN>;
}
}
close FIN;
close FOUT;
_______________________________________________
lilypond-user mailing list
lilypond-user@gnu.org
http://lists.gnu.org/mailman/listinfo/lilypond-user
