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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/%mainSettings/;
use LatexIndent::Switches qw/$is_m_switch_active $is_t_switch_active $is_tt_switch_active/;
use LatexIndent::LogFile qw/$logger/;
use Exporter qw/import/;
our @EXPORT_OK = qw/protect_blank_lines unprotect_blank_lines condense_blank_lines/;
sub protect_blank_lines {
my $self = shift;
unless ( ${ $mainSettings{modifyLineBreaks} }{preserveBlankLines} ) {
$logger->trace("*Blank lines will not be protected (preserveBlankLines=0)") if $is_t_switch_active;
return;
}
$logger->trace("*Protecting blank lines (see preserveBlankLines)") if $is_t_switch_active;
${$self}{body} =~ s/^(\h*)?\R/$tokens{blanklines}\n/mg;
return;
}
sub condense_blank_lines {
my $self = shift;
$logger->trace("*condense blank lines routine") if $is_t_switch_active;
# if preserveBlankLines is set to 0, then the blank-line-token will not be present
# in the document -- we change that here
if ( ${ $mainSettings{modifyLineBreaks} }{preserveBlankLines} == 0 ) {
# turn the switch on
${ $mainSettings{modifyLineBreaks} }{preserveBlankLines} = 1;
# log file information
$logger->trace("Updating body to include blank line token, this requires preserveBlankLines = 1")
if ($is_tt_switch_active);
$logger->trace("(any blanklines that could have been removed, would have done so by this point)")
if ($is_tt_switch_active);
# make the call
$self->protect_blank_lines;
$logger->trace("body now looks like:\n${$self}{body}") if ($is_tt_switch_active);
}
# grab the value from the settings
my $condenseMultipleBlankLinesInto = ${ $mainSettings{modifyLineBreaks} }{condenseMultipleBlankLinesInto};
# grab the blank-line-token
my $blankLineToken = $tokens{blanklines};
# condense!
$logger->trace(
"Condensing multiple blank lines into $condenseMultipleBlankLinesInto (see condenseMultipleBlankLinesInto)")
if $is_t_switch_active;
my $replacementToken = $blankLineToken;
for ( my $i = 1; $i < $condenseMultipleBlankLinesInto; $i++ ) {
$replacementToken .= "\n$blankLineToken";
}
$logger->trace("blank line replacement token: $replacementToken") if ($is_tt_switch_active);
${$self}{body} =~ s/($blankLineToken\h*\R*\h*){1,}$blankLineToken/$replacementToken/mgs;
$logger->trace("body now looks like:\n${$self}{body}") if ($is_tt_switch_active);
return;
}
sub unprotect_blank_lines {
my $self = shift;
# remove any empty lines that might have been added by the text_wrap routine; see, for example,
# test-cases/maxLineChars/multi-object-all.tex -l=multi-object2.yaml -m
${$self}{body} =~ s/^\h*\R//mg;
$logger->trace("Unprotecting blank lines (see preserveBlankLines)") if $is_t_switch_active;
my $blankLineToken = $tokens{blanklines};
if ( $is_m_switch_active and ${ $mainSettings{modifyLineBreaks}{textWrapOptions} }{huge} ne "overflow" ) {
$blankLineToken = join( "(?:\\h|\\R)*", split( //, $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;
}
$logger->trace("Finished unprotecting lines (see preserveBlankLines)") if $is_t_switch_active;
$logger->trace("body now looks like:") if ($is_tt_switch_active);
$logger->trace("${$self}{body}") if ($is_tt_switch_active);
}
1;
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