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package String::Elide::Lines; |
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our $DATE = '2017-01-29'; # DATE |
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our $VERSION = '0.003'; # VERSION |
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15246
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use 5.010001; |
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use strict; |
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use warnings; |
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use Exporter; |
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our @ISA = qw(Exporter); |
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our @EXPORT_OK = qw(elide); |
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sub _elide_lines { |
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my ($lines, $len, $marker, $truncate) = @_; |
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$marker = ["$marker\n"] unless ref $marker eq 'ARRAY'; |
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if (@$lines <= $len) { |
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return $lines; |
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} |
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my $len_marker = @$marker; |
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if ($len <= $len_marker) { |
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return [ @{$marker}[0..$len-1] ]; |
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} |
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if ($truncate eq 'top') { |
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return [ @$marker, @{$lines}[(@$lines - $len + $len_marker) .. $#$lines] ]; |
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} elsif ($truncate eq 'middle') { |
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my @top_lines = @{$lines}[0 .. ($len-$len_marker)/2-1]; |
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my @bottom_lines = @{$lines}[(@$lines - ($len-$len_marker-@top_lines)) .. $#$lines]; |
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return [ @top_lines, @$marker, @bottom_lines ]; |
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} elsif ($truncate eq 'ends') { |
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if ($len <= 2*$len_marker) { |
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my @marker2 = (@$marker, @$marker); |
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return [@marker2[0..$len-1]]; |
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} |
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my $offset = (@$lines-$len)/2 + $len_marker; |
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return [ @$marker, @{$lines}[$offset .. $offset + ($len-2*$len_marker)-1], @$marker ]; |
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} else { # bottom |
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return [ @{$lines}[0 .. $len-$len_marker-1], @$marker ]; |
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} |
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} |
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sub elide { |
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5431
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my ($str, $len, $opts) = @_; |
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$opts //= {}; |
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my $truncate = $opts->{truncate} // 'bottom'; |
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my $marker = $opts->{marker} // '..'; |
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my $default_prio = $opts->{default_prio} // 1; |
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# split into parts by priority |
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my @parts; |
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my @parts_attrs; |
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while ($str =~ m#]*)>(.*?)|(.*?)(?=
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if (defined $1) { |
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next unless length $2; |
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push @parts, $2; |
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push @parts_attrs, $1; |
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} elsif (defined $3) { |
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next unless length $3; |
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push @parts, $3; |
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push @parts_attrs, undef; |
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} elsif (defined $4) { |
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next unless length $4; |
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push @parts, $4; |
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push @parts_attrs, undef; |
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} |
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} |
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return "" unless @parts && $len > 0; |
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for my $i (0..$#parts) { |
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$parts[$i] = [split /^/, $parts[$i]]; |
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if (defined $parts_attrs[$i]) { |
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my $attrs = {}; |
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$attrs->{truncate} = $1 // $2 |
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if $parts_attrs[$i] =~ /\btruncate=(?:"([^"]*)"|(\S+))/; |
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$attrs->{marker} = $1 // $2 |
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if $parts_attrs[$i] =~ /\bmarker=(?:"([^"]*)"|(\S+))/; |
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$attrs->{prio} = $1 // $2 |
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if $parts_attrs[$i] =~ /\bprio(?:rity)?=(?:"([^"]*)"|(\S+))/; |
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$parts_attrs[$i] = $attrs; |
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} else { |
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$parts_attrs[$i] = {prio=>$default_prio}; |
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} |
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} |
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#use DD; dd \@parts; dd \@parts_attrs; |
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# elide and truncate prio by prio until str is short enough |
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PRIO: |
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while (1) { |
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# (re)calculate total len of all parts |
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my $all_parts_len = 0; |
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$all_parts_len += @$_ for @parts; |
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# total len of all parts is short enough, we're done |
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if ($all_parts_len <= $len) { |
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return join("", map { join "", @$_ } @parts); |
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} |
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# we still need to elide some parts. first collect part indexes that |
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# have the current largest priority. |
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my $highest_prio; |
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for (@parts_attrs) { |
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$highest_prio = $_->{prio} if !defined($highest_prio) || |
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$highest_prio < $_->{prio}; |
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} |
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my @high_indexes; |
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my $high_parts_len = 0; |
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for my $i (0..$#parts_attrs) { |
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if ($parts_attrs[$i]{prio} == $highest_prio) { |
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$high_parts_len += @{ $parts[$i] }; |
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push @high_indexes, $i; |
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} |
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} |
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if ($all_parts_len - $high_parts_len >= $len) { |
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# we need to fully eliminate all the highest parts part then search |
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# for another set of parts |
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for (reverse @high_indexes) { |
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splice @parts, $_, 1; |
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splice @parts_attrs, $_, 1; |
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next PRIO; |
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} |
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} |
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# elide all to-be-elided parts equally |
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# after this position, must elide a total of this number of lines after |
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# this position |
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my @must_elide_total_len_after_this; |
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my $tot_to_elide = $all_parts_len - $len; |
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for my $i (0..$#high_indexes) { |
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$must_elide_total_len_after_this[$i] = |
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int( ($i+1)/@high_indexes * $tot_to_elide ); |
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} |
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# calculate how many characters to truncate for each part |
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my $tot_already_elided = 0; |
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my $tot_still_to_elide = 0; |
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for my $i (reverse 0..$#high_indexes) { |
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my $idx = $high_indexes[$i]; |
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my $part_len = @{ $parts[$idx] }; |
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145
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my $to_elide = $must_elide_total_len_after_this[$#high_indexes - $i] - |
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$tot_already_elided; |
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100
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if ($to_elide <= 0) { |
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148
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# leave this part alone |
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} elsif ($part_len <= $to_elide) { |
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# we need to eliminate this part |
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splice @parts, $idx, 1; |
152
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splice @parts_attrs, $idx, 1; |
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$tot_already_elided += $part_len; |
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$tot_still_to_elide += ($to_elide - $part_len); |
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} else { |
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$parts[$idx] = _elide_lines( |
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$parts[$idx], |
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$part_len - $to_elide, |
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$parts_attrs[$idx]{marker} // $marker, |
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$parts_attrs[$idx]{truncate} // $truncate, |
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161
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); |
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$tot_already_elided += $to_elide; |
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$tot_still_to_elide = 0; |
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} |
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} |
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167
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} # while 1 |
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} |
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170
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1; |
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# ABSTRACT: Elide lines from a string, with options |
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173
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__END__ |