hard line break implementation

src/subParsers/makehtml/codeSpan.js

@@ -55,6 +55,8 @@ showdown.subParser('makehtml.codeSpan', function (text, options, globals) {
 
     c = c.replace(/^([ \t]*)/g, '');	// leading whitespace
     c = c.replace(/[ \t]*$/g, '');	// trailing whitespace
+    // remove newlines
+    c = c.replace(/\n/, ' ');
 
     let captureStartEvent = new showdown.Event('makehtml.codeSpan.onCapture', c);
     captureStartEvent

src/subParsers/makehtml/emphasisAndStrong.js

@@ -85,18 +85,23 @@ showdown.subParser('makehtml.emphasisAndStrong', function (text, options, global
       if (showdown.helper.isUndefined(attributes.strong)) {
         attributes.strong = {};
       }
+
       switch (tags) {
         case '<em>':
-          otp = '<em' + showdown.helper._populateAttributes(attributes.em) + '>' + txt + '</em>';
+          otp = '<em' + showdown.helper._populateAttributes(attributes.em) + '>' +
+                showdown.subParser('makehtml.hardLineBreaks')(txt, options, globals) +
+                '</em>';
           break;
         case '<strong>':
-          otp = '<strong' + showdown.helper._populateAttributes(attributes.strong) + '>' + txt + '</strong>';
+          otp = '<strong' + showdown.helper._populateAttributes(attributes.strong) + '>' +
+                showdown.subParser('makehtml.hardLineBreaks')(txt, options, globals) +
+                '</strong>';
           break;
         case '<strong><em>':
           otp = '<strong' + showdown.helper._populateAttributes(attributes.strong) + '>' +
-                  '<em' + showdown.helper._populateAttributes(attributes.em) + '>' +
-                    txt +
-                  '</em>' +
+                '<em' + showdown.helper._populateAttributes(attributes.em) + '>' +
+                showdown.subParser('makehtml.hardLineBreaks')(txt, options, globals) +
+                '</em>' +
                 '</strong>';
           break;
       }
@@ -109,10 +114,11 @@ showdown.subParser('makehtml.emphasisAndStrong', function (text, options, global
       ._setOptions(options);
     beforeHashEvent = globals.converter.dispatch(beforeHashEvent);
     otp = beforeHashEvent.output;
+    otp = showdown.subParser('makehtml.hashHTMLSpans')(otp, options, globals);
     return otp;
   }
 
-  // it's faster to have 3 separate regexes for each case than have just one
+  // it's faster to have separate regexes for each case than have just one
   // because of backtracking, in some cases, it could lead to an exponential effect
   // called "catastrophic backtrace". Ominous!
   const lmwuStrongEmRegex         = /\b___(\S[\s\S]*?)___\b/g,

src/subParsers/makehtml/githubCodeBlock.js

@@ -42,7 +42,6 @@ showdown.subParser('makehtml.githubCodeBlock', function (text, options, globals)
   });
 
   text = text.replace(emptyBlockRegex, function (wholeMatch, delim, language) {
-    console.log('|', wholeMatch, '|>');
     return parse(emptyBlockRegex, wholeMatch, delim, language, '');
   });
 

src/subParsers/makehtml/hardLineBreaks.js

@@ -0,0 +1,32 @@
+////
+// makehtml/emphasisAndStrong.js
+// Copyright (c) 2022 ShowdownJS
+//
+// Transforms MD emphasis and strong into `<em>` and `<strong>` html entities
+//
+// Markdown treats asterisks (*) and underscores (_) as indicators of emphasis.
+// Text wrapped with one * or _ will be wrapped with an HTML <em> tag;
+// double *’s or _’s will be wrapped with an HTML <strong> tag
+//
+// ***Author:***
+// - Estêvão Soares dos Santos (Tivie) <https://github.com/tivie>
+////
+
+showdown.subParser('makehtml.hardLineBreaks', function (text, options) {
+
+  // Do hard breaks
+  if (options.simpleLineBreaks) {
+    // GFM style hard breaks
+    // only add line breaks if the text does not contain a block (special case for lists)
+    if (!/\n\n¨K/.test(text)) {
+      text = text.replace(/\n+/gm, '<br />\n');
+    }
+  } else {
+    // Vanilla hard breaks
+    text = text.replace(/  +\n/g, '<br />\n');
+  }
+  text = text.replace(/\\\n/g, '<br />\n');
+
+  return text;
+
+});

src/subParsers/makehtml/heading.js

@@ -168,7 +168,6 @@ showdown.subParser('makehtml.heading', function (text, options, globals) {
       }
 
       nPrepend = showdown.subParser('makehtml.blockGamut')(multilineText, options, globals, 'makehtml.heading');
-      //console.log(nPrepend);
       if (nPrepend !== multilineText) {
         // we found a block, so it should take precedence
         prepend += nPrepend;
@@ -192,7 +191,7 @@ showdown.subParser('makehtml.heading', function (text, options, globals) {
 
   function parseHeader (pattern, wholeMatch, headingText, headingLevel, headingId) {
     let captureStartEvent = new showdown.Event('makehtml.heading.onCapture', headingText),
-      otp;
+        otp;
 
     captureStartEvent
       .setOutput(null)
@@ -215,7 +214,7 @@ showdown.subParser('makehtml.heading', function (text, options, globals) {
     } else {
       headingText = captureStartEvent.matches.heading;
       let spanGamut = showdown.subParser('makehtml.spanGamut')(headingText, options, globals),
-        attributes = captureStartEvent.attributes;
+          attributes = captureStartEvent.attributes;
       otp = '<h' + headingLevel + showdown.helper._populateAttributes(attributes) + '>' + spanGamut + '</h' + headingLevel + '>';
     }
 

src/subParsers/makehtml/spanGamut.js

@@ -34,17 +34,7 @@ showdown.subParser('makehtml.spanGamut', function (text, options, globals) {
   // now we encode amps and angles
   text = showdown.subParser('makehtml.encodeAmpsAndAngles')(text, options, globals);
 
-  // Do hard breaks
-  if (options.simpleLineBreaks) {
-    // GFM style hard breaks
-    // only add line breaks if the text does not contain a block (special case for lists)
-    if (!/\n\n¨K/.test(text)) {
-      text = text.replace(/\n+/g, '<br />\n');
-    }
-  } else {
-    // Vanilla hard breaks
-    text = text.replace(/  +\n/g, '<br />\n');
-  }
+  text = showdown.subParser('makehtml.hardLineBreaks')(text, options, globals);
 
   let afterEvent = new showdown.Event('makehtml.spanGamut.onEnd', text);
   afterEvent

src/subParsers/makehtml/strikethrough.js

@@ -33,7 +33,9 @@ showdown.subParser('makehtml.strikethrough', function (text, options, globals) {
     if (captureStartEvent.output && captureStartEvent.output !== '') {
       otp = captureStartEvent.output;
     } else {
-      otp = '<del' + showdown.helper._populateAttributes(captureStartEvent.attributes) + '>' + txt + '</del>';
+      otp = '<del' + showdown.helper._populateAttributes(captureStartEvent.attributes) + '>' +
+            showdown.subParser('makehtml.hardLineBreaks')(txt, options, globals) +
+            '</del>';
     }
 
     let beforeHashEvent = new showdown.Event('makehtml.strikethrough.onHash', otp);

src/subParsers/makehtml/underline.js

@@ -74,7 +74,9 @@ showdown.subParser('makehtml.underline', function (text, options, globals) {
     if (captureStartEvent.output && captureStartEvent.output !== '') {
       otp = captureStartEvent.output;
     } else {
-      otp = '<u' + showdown.helper._populateAttributes(captureStartEvent.attributes) + '>' + txt + '</u>';
+      otp = '<u' + showdown.helper._populateAttributes(captureStartEvent.attributes) + '>' +
+        showdown.subParser('makehtml.hardLineBreaks')(txt, options, globals) +
+        '</u>';
     }
     let beforeHashEvent = new showdown.Event('makehtml.underline.onHash', otp);
     beforeHashEvent

test/functional/makehtml/extra.testsuite.commonmark.js

@@ -26,6 +26,7 @@ describe('makeHtml() commonmark testsuite', function () {
             case 'Thematic breaks_43': // malformed input of test case
             case 'Thematic breaks_61': // hr inside lists does not make sense
             case 'Fenced code blocks_146': // as of date, github doesn't support this so we don't either
+            //case 'Raw HTML_619': // breaks prettifier so the test fails
               continue;
 
             case 'Setext headings_91': //it's failing because the testcase converts " to " even though it's not supposed to
@@ -40,6 +41,10 @@ describe('makeHtml() commonmark testsuite', function () {
             case 'Fenced code blocks_144': // we use different classes to mark languages in fenced code blocks
               testsuite[section][i].expected = testsuite[section][i].expected.replace('language-;', '; language-;');
               break;
+
+            case 'Hard line breaks_638':
+              console.log(testsuite[section][i].input);
+
           }
           it(name, assertion(testsuite[section][i], converter, true));
         }

test/functional/makehtml/makehtml.bootstrap.js

@@ -112,8 +112,14 @@
 
     //prettify
     if (prettify) {
-      testCase.expected = htmlPrettify(testCase.expected);
-      testCase.actual = htmlPrettify(testCase.actual);
+      try {
+        testCase.expected = htmlPrettify(testCase.expected);
+        testCase.actual = htmlPrettify(testCase.actual);
+      } catch (e) {
+        // some weird html in testcase breaks prettifier so we skip it and do some manual stuff
+        testCase.expected = testCase.expected.trim().replace('\n', '');
+        testCase.actual = testCase.actual.trim().replace('\n', '');
+      }
     }