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package LatexIndent::ModifyLineBreaks;
# 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 Data::Dumper;
use Exporter qw/import/;
use Text::Wrap;
use LatexIndent::GetYamlSettings qw/%masterSettings/;
use LatexIndent::Tokens qw/%tokens/;
use LatexIndent::TrailingComments qw/$trailingCommentRegExp/;
use LatexIndent::Switches qw/$is_m_switch_active $is_t_switch_active $is_tt_switch_active/;
use LatexIndent::Item qw/$listOfItems/;
use LatexIndent::LogFile qw/$logger/;
our @EXPORT_OK = qw/modify_line_breaks_body modify_line_breaks_end adjust_line_breaks_end_parent remove_line_breaks_begin text_wrap remove_paragraph_line_breaks construct_paragraph_reg_exp text_wrap_remove_paragraph_line_breaks verbatim_modify_line_breaks/;
our $paragraphRegExp = q();
sub modify_line_breaks_body{
my $self = shift;
#
# Blank line poly-switch notes (==4)
#
# when BodyStartsOnOwnLine=4 we adopt the following approach:
# temporarily change BodyStartsOnOwnLine to -1, make adjustments
# temporarily change BodyStartsOnOwnLine to 3, make adjustments
# switch BodyStartsOnOwnLine back to 4
# add a line break after \begin{statement} if appropriate
my @polySwitchValues = (${$self}{BodyStartsOnOwnLine}==4)?(-1,3):(${$self}{BodyStartsOnOwnLine});
foreach(@polySwitchValues){
my $BodyStringLogFile = ${$self}{aliases}{BodyStartsOnOwnLine}||"BodyStartsOnOwnLine";
if($_>=1 and !${$self}{linebreaksAtEnd}{begin}){
# if the <begin> statement doesn't finish with a line break,
# then we have different actions based upon the value of BodyStartsOnOwnLine:
# BodyStartsOnOwnLine == 1 just add a new line
# BodyStartsOnOwnLine == 2 add a comment, and then new line
# BodyStartsOnOwnLine == 3 add a blank line, and then new line
if($_==1){
# modify the begin statement
$logger->trace("Adding a linebreak at the end of begin statement ${$self}{begin} (see $BodyStringLogFile)") if $is_t_switch_active;
${$self}{begin} .= "\n";
${$self}{linebreaksAtEnd}{begin} = 1;
$logger->trace("Removing leading space from body of ${$self}{name} (see $BodyStringLogFile)") if $is_t_switch_active;
${$self}{body} =~ s/^\h*//;
} elsif($_==2){
# by default, assume that no trailing comment token is needed
my $trailingCommentToken = q();
if(${$self}{body} !~ m/^\h*$trailingCommentRegExp/s){
# modify the begin statement
$logger->trace("Adding a % at the end of begin ${$self}{begin} followed by a linebreak ($BodyStringLogFile == 2)") if $is_t_switch_active;
$trailingCommentToken = "%".$self->add_comment_symbol;
${$self}{begin} =~ s/\h*$//;
${$self}{begin} .= "$trailingCommentToken\n";
${$self}{linebreaksAtEnd}{begin} = 1;
$logger->trace("Removing leading space from body of ${$self}{name} (see $BodyStringLogFile)") if $is_t_switch_active;
${$self}{body} =~ s/^\h*//;
} else {
$logger->trace("Even though $BodyStringLogFile == 2, ${$self}{begin} already finishes with a %, so not adding another.") if $is_t_switch_active;
}
} elsif ($_==3){
my $trailingCharacterToken = q();
$logger->trace("Adding a blank line at the end of begin ${$self}{begin} followed by a linebreak ($BodyStringLogFile == 3)") if $is_t_switch_active;
${$self}{begin} =~ s/\h*$//;
${$self}{begin} .= (${$masterSettings{modifyLineBreaks}}{preserveBlankLines}?$tokens{blanklines}:"\n")."\n";
${$self}{linebreaksAtEnd}{begin} = 1;
$logger->trace("Removing leading space from body of ${$self}{name} (see $BodyStringLogFile)") if $is_t_switch_active;
${$self}{body} =~ s/^\h*//;
}
} elsif ($_==-1 and ${$self}{linebreaksAtEnd}{begin}){
# remove line break *after* begin, if appropriate
$self->remove_line_breaks_begin;
}
}
}
sub remove_line_breaks_begin{
my $self = shift;
my $BodyStringLogFile = ${$self}{aliases}{BodyStartsOnOwnLine}||"BodyStartsOnOwnLine";
$logger->trace("Removing linebreak at the end of begin (see $BodyStringLogFile)") if $is_t_switch_active;
${$self}{begin} =~ s/\R*$//sx;
${$self}{linebreaksAtEnd}{begin} = 0;
}
sub modify_line_breaks_end{
my $self = shift;
#
# Blank line poly-switch notes (==4)
#
# when EndStartsOnOwnLine=4 we adopt the following approach:
# temporarily change EndStartsOnOwnLine to -1, make adjustments
# temporarily change EndStartsOnOwnLine to 3, make adjustments
# switch EndStartsOnOwnLine back to 4
#
my @polySwitchValues =(defined ${$self}{EndStartsOnOwnLine} and ${$self}{EndStartsOnOwnLine}==4) ?(-1,3):(${$self}{EndStartsOnOwnLine});
foreach(@polySwitchValues){
# possibly modify line break *before* \end{statement}
if(defined ${$self}{EndStartsOnOwnLine}){
my $EndStringLogFile = ${$self}{aliases}{EndStartsOnOwnLine}||"EndStartsOnOwnLine";
if($_>=1 and !${$self}{linebreaksAtEnd}{body}){
# if the <body> statement doesn't finish with a line break,
# then we have different actions based upon the value of EndStartsOnOwnLine:
# EndStartsOnOwnLine == 1 just add a new line
# EndStartsOnOwnLine == 2 add a comment, and then new line
# EndStartsOnOwnLine == 3 add a blank line, and then new line
$logger->trace("Adding a linebreak at the end of body (see $EndStringLogFile)") if $is_t_switch_active;
# by default, assume that no trailing character token is needed
my $trailingCharacterToken = q();
if($_==2){
$logger->trace("Adding a % immediately after body of ${$self}{name} ($EndStringLogFile==2)") if $is_t_switch_active;
$trailingCharacterToken = "%".$self->add_comment_symbol;
${$self}{body} =~ s/\h*$//s;
} elsif ($_==3) {
$logger->trace("Adding a blank line immediately after body of ${$self}{name} ($EndStringLogFile==3)") if $is_t_switch_active;
$trailingCharacterToken = "\n".(${$masterSettings{modifyLineBreaks}}{preserveBlankLines}?$tokens{blanklines}:q());
${$self}{body} =~ s/\h*$//s;
}
# modified end statement
if(${$self}{body} =~ m/^\h*$/s and (defined ${$self}{BodyStartsOnOwnLine}) and ${$self}{BodyStartsOnOwnLine} >=1 ){
${$self}{linebreaksAtEnd}{body} = 0;
} else {
${$self}{body} .= "$trailingCharacterToken\n";
${$self}{linebreaksAtEnd}{body} = 1;
}
} elsif ($_==-1 and ${$self}{linebreaksAtEnd}{body}){
# remove line break *after* body, if appropriate
# check to see that body does *not* finish with blank-line-token,
# if so, then don't remove that final line break
if(${$self}{body} !~ m/$tokens{blanklines}$/s){
$logger->trace("Removing linebreak at the end of body (see $EndStringLogFile)") if $is_t_switch_active;
${$self}{body} =~ s/\R*$//sx;
${$self}{linebreaksAtEnd}{body} = 0;
} else {
$logger->trace("Blank line token found at end of body (${$self}{name}), see preserveBlankLines, not removing line break before ${$self}{end}") if $is_t_switch_active;
}
}
}
}
#
# Blank line poly-switch notes (==4)
#
# when EndFinishesWithLineBreak=4 we adopt the following approach:
# temporarily change EndFinishesWithLineBreak to -1, make adjustments
# temporarily change EndFinishesWithLineBreak to 3, make adjustments
# switch EndFinishesWithLineBreak back to 4
#
@polySwitchValues =(defined ${$self}{EndFinishesWithLineBreak} and ${$self}{EndFinishesWithLineBreak}==4) ?(-1,3):(${$self}{EndFinishesWithLineBreak});
foreach(@polySwitchValues){
last if !(defined $_);
${$self}{linebreaksAtEnd}{end} = 0 if($_==3 and (defined ${$self}{EndFinishesWithLineBreak} and ${$self}{EndFinishesWithLineBreak}==4));
# possibly modify line break *after* \end{statement}
if(defined $_ and $_>=1
and !${$self}{linebreaksAtEnd}{end}){
# if the <end> statement doesn't finish with a line break,
# then we have different actions based upon the value of EndFinishesWithLineBreak:
# EndFinishesWithLineBreak == 1 just add a new line
# EndFinishesWithLineBreak == 2 add a comment, and then new line
# EndFinishesWithLineBreak == 3 add a blank line, and then new line
my $EndStringLogFile = ${$self}{aliases}{EndFinishesWithLineBreak}||"EndFinishesWithLineBreak";
if($_==1){
$logger->trace("Adding a linebreak at the end of ${$self}{end} ($EndStringLogFile==1)") if $is_t_switch_active;
${$self}{linebreaksAtEnd}{end} = 1;
# modified end statement
${$self}{replacementText} .= "\n";
} elsif($_==2){
if(${$self}{endImmediatelyFollowedByComment}){
# no need to add a % if one already exists
$logger->trace("Even though $EndStringLogFile == 2, ${$self}{end} is immediately followed by a %, so not adding another; not adding line break.") if $is_t_switch_active;
} else {
# otherwise, create a trailing comment, and tack it on
$logger->trace("Adding a % immediately after, ${$self}{end} ($EndStringLogFile==2)") if $is_t_switch_active;
my $trailingCommentToken = "%".$self->add_comment_symbol;
${$self}{end} =~ s/\h*$//s;
${$self}{replacementText} .= "$trailingCommentToken\n";
${$self}{linebreaksAtEnd}{end} = 1;
}
} elsif($_==3){
$logger->trace("Adding a blank line at the end of ${$self}{end} ($EndStringLogFile==3)") if $is_t_switch_active;
${$self}{linebreaksAtEnd}{end} = 1;
# modified end statement
${$self}{replacementText} .= (${$masterSettings{modifyLineBreaks}}{preserveBlankLines}?$tokens{blanklines}:"\n")."\n";
}
}
}
}
sub adjust_line_breaks_end_parent{
# when a parent object contains a child object, the line break
# at the end of the parent object can become messy
my $self = shift;
# most recent child object
my $child = @{${$self}{children}}[-1];
# adjust parent linebreaks information
if(${$child}{linebreaksAtEnd}{end} and ${$self}{body} =~ m/${$child}{replacementText}\h*\R*$/s and !${$self}{linebreaksAtEnd}{body}){
$logger->trace("ID: ${$child}{id}") if($is_t_switch_active);
$logger->trace("${$child}{begin}...${$child}{end} is found at the END of body of parent, ${$self}{name}, avoiding a double line break:") if($is_t_switch_active);
$logger->trace("adjusting ${$self}{name} linebreaksAtEnd{body} to be 1") if($is_t_switch_active);
${$self}{linebreaksAtEnd}{body}=1;
}
# the modify line switch can adjust line breaks, so we need another check,
# see for example, test-cases/environments/environments-remove-line-breaks-trailing-comments.tex
if(defined ${$child}{linebreaksAtEnd}{body}
and !${$child}{linebreaksAtEnd}{body}
and ${$child}{body} =~ m/\R(?:$trailingCommentRegExp\h*)?$/s ){
# log file information
$logger->trace("Undisclosed line break at the end of body of ${$child}{name}: '${$child}{end}'") if($is_t_switch_active);
$logger->trace("Adding a linebreak at the end of body for ${$child}{id}") if($is_t_switch_active);
# make the adjustments
${$child}{body} .= "\n";
${$child}{linebreaksAtEnd}{body}=1;
}
}
sub verbatim_modify_line_breaks{
# verbatim modify line breaks are a bit special, as they happen before
# any of the main processes have been done
my $self = shift;
while ( my ($key,$child)= each %{${$self}{verbatim}}){
if(defined ${$child}{BeginStartsOnOwnLine}){
my $BeginStringLogFile = ${$child}{aliases}{BeginStartsOnOwnLine};
$logger->trace("*$BeginStringLogFile is ${$child}{BeginStartsOnOwnLine} for ${$child}{name}") if $is_t_switch_active ;
if (${$child}{BeginStartsOnOwnLine}==-1){
# VerbatimStartsOnOwnLine = -1
if(${$self}{body}=~m/^\h*${$child}{id}/m){
$logger->trace("${$child}{name} begins on its own line, removing leading line break") if $is_t_switch_active ;
${$self}{body} =~ s/(\R|\h)*${$child}{id}/${$child}{id}/s;
}
} elsif (${$child}{BeginStartsOnOwnLine}>=1 and ${$self}{body}!~m/^\h*${$child}{id}/m){
# VerbatimStartsOnOwnLine = 1, 2 or 3
my $trailingCharacterToken = q();
if(${$child}{BeginStartsOnOwnLine}==1){
$logger->trace("Adding a linebreak at the beginning of ${$child}{begin} (see $BeginStringLogFile)") if $is_t_switch_active;
} elsif (${$child}{BeginStartsOnOwnLine}==2){
$logger->trace("Adding a % at the end of the line that ${$child}{begin} is on, then a linebreak ($BeginStringLogFile == 2)") if $is_t_switch_active;
$trailingCharacterToken = "%".$self->add_comment_symbol;
} elsif (${$child}{BeginStartsOnOwnLine}==3){
$logger->trace("Adding a blank line at the end of the line that ${$child}{begin} is on, then a linebreak ($BeginStringLogFile == 3)") if $is_t_switch_active;
$trailingCharacterToken = "\n";
}
${$self}{body} =~ s/\h*${$child}{id}/$trailingCharacterToken\n${$child}{id}/s;
}
}
}
}
sub text_wrap_remove_paragraph_line_breaks{
my $self = shift;
if(${$masterSettings{modifyLineBreaks}{removeParagraphLineBreaks}}{beforeTextWrap}){
$self->remove_paragraph_line_breaks if ${$self}{removeParagraphLineBreaks};
$self->text_wrap if (${$self}{textWrapOptions} and ${$masterSettings{modifyLineBreaks}{textWrapOptions}}{perCodeBlockBasis});
} else {
$self->text_wrap if (${$self}{textWrapOptions} and ${$masterSettings{modifyLineBreaks}{textWrapOptions}}{perCodeBlockBasis});
}
}
sub text_wrap{
my $self = shift;
# alignment at ampersand can take priority
return if(${$self}{lookForAlignDelims} and ${$masterSettings{modifyLineBreaks}{textWrapOptions}}{alignAtAmpersandTakesPriority});
# call the text wrapping routine
my $columns;
# columns might have been defined by the user
if(defined ${$self}{columns}){
$columns = ${$self}{columns};
} elsif(ref ${$masterSettings{modifyLineBreaks}{textWrapOptions}}{columns} eq "HASH"){
if(defined ${${$masterSettings{modifyLineBreaks}{textWrapOptions}}{columns}}{default}){
$columns = ${${$masterSettings{modifyLineBreaks}{textWrapOptions}}{columns}}{default};
} else {
$columns = 80;
}
} elsif (defined ${$masterSettings{modifyLineBreaks}{textWrapOptions}}{columns}){
$columns = ${$masterSettings{modifyLineBreaks}{textWrapOptions}}{columns} ;
} else {
$columns = 80;
}
$Text::Wrap::columns=$columns;
if(${$masterSettings{modifyLineBreaks}{textWrapOptions}}{separator} ne ''){
$Text::Wrap::separator=${$masterSettings{modifyLineBreaks}{textWrapOptions}}{separator};
}
${$self}{body} = wrap('','',${$self}{body});
}
sub construct_paragraph_reg_exp{
my $self = shift;
$logger->trace("*Constructing the paragraph-stop regexp (see paragraphsStopAt)") if $is_t_switch_active ;
my $stopAtRegExp = q();
while( my ($paragraphStopAt,$yesNo)= each %{${$masterSettings{modifyLineBreaks}{removeParagraphLineBreaks}}{paragraphsStopAt}}){
if($yesNo){
# the headings (chapter, section, etc) need a slightly special treatment
$paragraphStopAt = "afterHeading" if($paragraphStopAt eq "heading");
# the comment need a slightly special treatment
$paragraphStopAt = "trailingComment" if($paragraphStopAt eq "comments");
# output to log file
$logger->trace("The paragraph-stop regexp WILL include $tokens{$paragraphStopAt} (see paragraphsStopAt)") if $is_t_switch_active ;
# update the regexp
if($paragraphStopAt eq "items"){
$stopAtRegExp .= "|(?:\\\\(?:".$listOfItems."))";
} else {
$stopAtRegExp .= "|(?:".($paragraphStopAt eq "trailingComment" ? "%" : q() ).$tokens{$paragraphStopAt}."\\d+)";
}
} else {
$logger->trace("The paragraph-stop regexp won't include $tokens{$paragraphStopAt} (see paragraphsStopAt)") if ($tokens{$paragraphStopAt} and $is_t_switch_active);
}
}
$paragraphRegExp = qr/
^
(?!$tokens{beginOfToken})
(\w
(?:
(?!
(?:$tokens{blanklines}|\\par)
).
)*?
)
(
(?:
^(?:(\h*\R)|\\par|$tokens{blanklines}$stopAtRegExp)
)
|
\z # end of string
)/sxm;
$logger->trace("The paragraph-stop-regexp is:") if $is_tt_switch_active ;
$logger->trace($paragraphRegExp) if $is_tt_switch_active ;
}
sub remove_paragraph_line_breaks{
my $self = shift;
return unless ${$self}{removeParagraphLineBreaks};
# alignment at ampersand can take priority
return if(${$self}{lookForAlignDelims} and ${$masterSettings{modifyLineBreaks}{removeParagraphLineBreaks}}{alignAtAmpersandTakesPriority});
$logger->trace("Checking ${$self}{name} for paragraphs (see removeParagraphLineBreaks)") if $is_t_switch_active;
my $paragraphCounter;
my @paragraphStorage;
${$self}{body} =~ s/$paragraphRegExp/
$paragraphCounter++;
push(@paragraphStorage,{id=>$tokens{paragraph}.$paragraphCounter.$tokens{endOfToken},value=>$1});
# replace comment with dummy text
$tokens{paragraph}.$paragraphCounter.$tokens{endOfToken}.$2;
/xsmeg;
while( my $paragraph = pop @paragraphStorage){
# remove all line breaks from paragraph, except for any at the very end
${$paragraph}{value} =~ s/\R(?!\z)/ /sg;
${$self}{body} =~ s/${$paragraph}{id}/${$paragraph}{value}/;
}
}
1;
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