72 lines
1.5 KiB
Perl
Executable File
72 lines
1.5 KiB
Perl
Executable File
use strict;
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use warnings;
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package DataFiles;
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# Field numbers, so the arrays which (read|write)_file use can be accessed more pleasantly
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use constant STR_ID => 0;
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use constant STR_CONTEXT => 1;
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use constant STR_DESCRIPTION => 2;
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use constant STR_FLAGS => 3;
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# Export the field numbers
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require Exporter;
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our @ISA = qw(Exporter);
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our @EXPORT = qw(STR_ID STR_CONTEXT STR_DESCRIPTION STR_FLAGS);
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# Read a file containing \n-separated fields and \n\n-separated records
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sub read_file {
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my ($filename, %params) = @_;
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# If 'ignoremissing' has been passed, handle non-existent files as if they were empty
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if ($params{ignoremissing} and not -e $filename) {
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return [];
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}
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open my $f, '<', $filename or die "Error opening $filename for input: $!";
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my (@records, @fields);
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while (<$f>) {
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chomp;
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if (length) {
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# Each line stores a separate field
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push @fields, unescape($_);
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} else {
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# Split records by empty lines
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push @records, [@fields];
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@fields = ();
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}
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}
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push @records, [@fields] if @fields;
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return \@records;
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}
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# Inverse of read_file
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sub write_file {
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my ($filename, $data) = @_;
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open my $f, '>', $filename or die "Error opening $filename for output: $!";
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for (@$data) {
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print $f escape($_), "\n" for @$_;
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print $f "\n";
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}
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}
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# Convert \ to \\, newlines to \n, blank lines to \
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sub unescape {
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my $t = $_[0];
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return "" if $t eq "\\";
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$t =~ s/\\n/\n/g;
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$t =~ s/\\\\/\\/g;
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$t;
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}
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sub escape {
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my $t = $_[0];
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return "\\" unless defined $t and length $t;
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$t =~ s/\\/\\\\/g;
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$t =~ s/\n/\\n/g;
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$t;
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}
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1; |