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+package LatexIndent::Check;
+# 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 Exporter qw/import/;
+use LatexIndent::LogFile qw/$logger/;
+use LatexIndent::Switches qw/$is_m_switch_active $is_check_verbose_switch_active/;
+our @ISA = "LatexIndent::Document"; # class inheritance, Programming Perl, pg 321
+our @EXPORT_OK = qw/simple_diff/;
+
+sub simple_diff {
+ my $self = shift;
+
+ # simple diff...
+ $logger->info("*simple diff: (check switch active)");
+
+ # check switch work below here
+ if (${$self}{originalBody} eq ${$self}{body}){
+ $logger->info("no differences, no diff to report");
+ return;
+ }
+
+ # otherwise we loop through the old and new body, and make comparisons
+ my @oldBody = split("\n",${$self}{originalBody});
+ my @newBody = split("\n",${$self}{body});
+ my @diff = ();
+
+ # this loop stores the differences ...
+ if($is_m_switch_active){
+ # if -m *is* active, then the number of lines in old and new may not be the same
+ # so we need to go through the options
+ my $maxLines = ($#oldBody >= $#newBody ? $#oldBody : $#newBody);
+
+ # loop through to maxLines, accounting for the three scenarios:
+ #
+ # oldBody[lineCount] and newBody[lineCount] both defined
+ # oldBody[lineCount] defined and newBody[lineCount] not defined
+ # oldBody[lineCount] not defined and newBody[lineCount] defined
+ #
+ for (my $lineCount=0;$lineCount<=$maxLines;$lineCount++){
+ if ($lineCount<=$#oldBody and $lineCount<=$#newBody ){
+ if ($oldBody[$lineCount] ne $newBody[$lineCount]){
+ push(@diff,{old=>$oldBody[$lineCount],new=>$newBody[$lineCount],lineNumber=>$lineCount+1});
+ }
+ } elsif ($lineCount<=$#oldBody) {
+ push(@diff,{old=>$oldBody[$lineCount],lineNumber=>$lineCount+1});
+ } else {
+ push(@diff,{new=>$newBody[$lineCount],lineNumber=>$lineCount+1});
+ }
+ }
+ } else {
+ # if -m is not active, then the number of lines in old and new will be the same
+ for (my $lineCount=0;$lineCount<=$#oldBody;$lineCount++){
+ if ($oldBody[$lineCount] ne $newBody[$lineCount]){
+ push(@diff,{old=>$oldBody[$lineCount],new=>$newBody[$lineCount],lineNumber=>$lineCount+1});
+ }
+ }
+ }
+
+ # initialise the old and new tmp body for storage
+ my $tmpOldBody = '-';
+ my $tmpNewBody = '+';
+ my $previousLineNumber = -1;
+
+ # and the 'diff chunk' storage array
+ my @diffChunks = ();
+ my $diffChunkFirstLineNumber = ${$diff[0]}{lineNumber};
+
+ # ... and this loop combines the diffs into chunks
+ for my $i (0..$#diff) {
+
+ my $currentLineNumber = ${$diff[$i]}{lineNumber};
+
+ if ($i == $#diff
+ or ( $previousLineNumber>=0 and $currentLineNumber>($previousLineNumber+1) )){
+
+ my $lastLine = ${$diff[$i-1]}{lineNumber};
+
+ if ($i == $#diff){
+ $lastLine = $currentLineNumber;
+ $tmpOldBody .= ($tmpOldBody eq '-' ? q() : "\n-").${$diff[$i]}{old};
+ $tmpNewBody .= ($tmpNewBody eq '+' ? q() : "\n+").${$diff[$i]}{new};
+ }
+
+ push(@diffChunks, {old=>$tmpOldBody,
+ new=>$tmpNewBody,
+ firstLine=>$diffChunkFirstLineNumber,
+ lastLine=>$lastLine } );
+
+ $tmpOldBody = '-'.${$diff[$i]}{old} if defined ${$diff[$i]}{old};
+ $tmpNewBody = '+'.${$diff[$i]}{new} if defined ${$diff[$i]}{new};
+ $diffChunkFirstLineNumber = $currentLineNumber;
+ } else {
+ $tmpOldBody .= ($tmpOldBody eq '-' ? q() : "\n-").${$diff[$i]}{old} if defined ${$diff[$i]}{old};
+ $tmpNewBody .= ($tmpNewBody eq '+' ? q() : "\n+").${$diff[$i]}{new} if defined ${$diff[$i]}{new};
+ }
+
+ $previousLineNumber = ${$diff[$i]}{lineNumber};
+ }
+
+ # finally, output the diff chunks
+ foreach (@diffChunks){
+ $logger->info("@@ ${$_}{firstLine} -- ${$_}{lastLine} @@");
+ $logger->info(${$_}{old});
+ $logger->info(${$_}{new});
+
+ # possibly output to terminal
+ if($is_check_verbose_switch_active){
+ print "\n@@ ${$_}{firstLine} -- ${$_}{lastLine} @@\n";
+ print ${$_}{old},"\n";
+ print ${$_}{new},"\n";
+ }
+ }
+}
+
+1;