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package LatexIndent::BlankLines;
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# See http://www.gnu.org/licenses/.
#
# Chris Hughes, 2017
#
# For all communication, please visit: https://github.com/cmhughes/latexindent.pl
use strict;
use warnings;
use LatexIndent::Tokens qw/%tokens/;
use LatexIndent::GetYamlSettings qw/%masterSettings/;
use LatexIndent::Switches qw/$is_m_switch_active $is_t_switch_active $is_tt_switch_active/;
use Exporter qw/import/;
our @EXPORT_OK = qw/protect_blank_lines unprotect_blank_lines condense_blank_lines/;
sub protect_blank_lines{
return unless $is_m_switch_active;
my $self = shift;
unless(${$masterSettings{modifyLineBreaks}}{preserveBlankLines}){
$self->logger("Blank lines will not be protected (preserveBlankLines=0)",'heading') if $is_t_switch_active;
return
}
$self->logger("Protecting blank lines (see preserveBlankLines)",'heading') if $is_t_switch_active;
${$self}{body} =~ s/^(\h*)?\R/$tokens{blanklines}\n/mg;
return;
}
sub condense_blank_lines{
return unless $is_m_switch_active;
return unless ${$masterSettings{modifyLineBreaks}}{condenseMultipleBlankLinesInto}>0;
my $self = shift;
# if preserveBlankLines is set to 0, then the blank-line-token will not be present
# in the document -- we change that here
if(${$masterSettings{modifyLineBreaks}}{preserveBlankLines}==0){
# turn the switch on
${$masterSettings{modifyLineBreaks}}{preserveBlankLines}=1;
# log file information
$self->logger("Updating body to inclued blank line token, this requires preserveBlankLines = 1",'ttrace') if($is_tt_switch_active);
$self->logger("(any blanklines that could have been removed, would have done so by this point)",'ttrace') if($is_tt_switch_active);
# make the call
$self->protect_blank_lines ;
$self->logger("body now looks like:\n${$self}{body}",'ttrace') if($is_tt_switch_active);
}
# grab the value from the settings
my $condenseMultipleBlankLinesInto = ${$masterSettings{modifyLineBreaks}}{condenseMultipleBlankLinesInto};
# grab the blank-line-token
my $blankLineToken = $tokens{blanklines};
# condense!
$self->logger("Condensing multiple blank lines into $condenseMultipleBlankLinesInto (see condenseMultipleBlankLinesInto)",'heading') if $is_t_switch_active;
my $replacementToken = $blankLineToken;
for (my $i=1; $i<$condenseMultipleBlankLinesInto; $i++ ){
$replacementToken .= "\n$blankLineToken";
}
$self->logger("blank line replacement token: $replacementToken",'ttrace') if($is_tt_switch_active);
${$self}{body} =~ s/($blankLineToken\h*\R*\h*){1,}$blankLineToken/$replacementToken/mgs;
$self->logger("body now looks like:\n${$self}{body}",'ttrace') if($is_tt_switch_active);
return;
}
sub unprotect_blank_lines{
return unless $is_m_switch_active;
return unless ${$masterSettings{modifyLineBreaks}}{preserveBlankLines};
my $self = shift;
$self->logger("Unprotecting blank lines (see preserveBlankLines)",'heading') if $is_t_switch_active;
my $blankLineToken = $tokens{blanklines};
# loop through the body, looking for the blank line token
while(${$self}{body} =~ m/$blankLineToken/s){
# when the blank line token occupies the whole line
${$self}{body} =~ s/^\h*$blankLineToken$//mg;
# when there's stuff *after* the blank line token
${$self}{body} =~ s/(^\h*)$blankLineToken/"\n".$1/meg;
# when there is stuff before and after the blank line token
${$self}{body} =~ s/^(.*?)$blankLineToken\h*(.*?)\h*$/$1."\n".($2?"\n".$2:$2)/meg;
# when there is only stuff *after* the blank line token
${$self}{body} =~ s/^$blankLineToken\h*(.*?)$/$1."\n"/emg;
}
$self->logger("Finished unprotecting lines (see preserveBlankLines)",'heading') if $is_t_switch_active;
$self->logger("body now looks like ${$self}{body}",'ttrace') if($is_tt_switch_active);
}
1;
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