User:Polygnotus/Scripts/DiffCompare.js

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Documentation for this user script can be added at User:Polygnotus/Scripts/DiffCompare.

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 // https://github.com/google/diff-match-patch

 $.ajax('https://cdn.jsdelivr.net/gh/google/diff-match-patch@master/javascript/diff_match_patch.js',{
 dataType:'script',
 cache:true
 }).then(function(){

 constDEBUG=false;

 functiondebug(...args){
 if(DEBUG){
 debug('[DiffCompare]',...args);
 }
 }


 debug('diff_match_patch library loaded successfully');

 if(typeofdiff_match_patch==='undefined'){
 console.error('diff_match_patch is undefined after loading');
 return;
 }

 functionshowDiff(text1,text2){
 debug('showDiff called with:',{text1,text2});

 constdmp=newdiff_match_patch();
 debug('diff_match_patch instance created');

 constdiffs=dmp.diff_main(text1,text2);
 debug('diffs created:',diffs);

 dmp.diff_cleanupSemantic(diffs);
 debug('diffs after cleanup:',diffs);

 lethtml='';
 for(leti=0;i<diffs.length;i++){
 debug(`Processing diff ${i}:`,diffs[i]);
 constop=diffs[i][0];
 constdata=diffs[i][1];
 switch(op){
 case-1:// DIFF_DELETE
 html+='<del style="background-color: #ffe6e6;">'+escapeHtml(data)+'</del>';
 break;
 case1:// DIFF_INSERT
 html+='<ins style="background-color: #e6ffe6;">'+escapeHtml(data)+'</ins>';
 break;
 case0:// DIFF_EQUAL
 html+='<span>'+escapeHtml(data)+'</span>';
 break;
 default:
 console.error(`Unknown diff operation: ${op}`);
 }
 }
 debug('Final HTML:',html);
 returnhtml;
 }

 functionescapeHtml(unsafe){
 returnunsafe
 .replace(/&/g,"&amp;")
 .replace(/</g,"&lt;")
 .replace(/>/g,"&gt;")
 .replace(/"/g,"&quot;")
 .replace(/'/g,"&#039;");
 }

 constoldText="The quick brown fox jumps over the lazy dog.";
 constnewText="The fast brown fox leaps over the lazy cat.";

 try{
 debug('Attempting to generate diff');
 constdiffHtml=showDiff(oldText,newText);
 debug('Diff generation successful');
 debug('Diff result:',diffHtml);

 constdiffContainer=$('<div>')
 .attr('id','diff-output')
 .css({
 'border':'1px solid #a2a9b1',
 'padding':'10px',
 'margin-bottom':'20px',
 'background-color':'#f8f9fa'
 })
 .html('<strong>Diff Result:</strong><br>'+diffHtml);

 $('#bodyContent').prepend(diffContainer);

 }catch(error){
 console.error('Error generating diff:',error);
 }
 }).catch(function(error){
 console.error('Error loading diff_match_patch library:',error);
 });

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