fix: use new frontmatter in test case

on-behalf-of: @Mermaid-Chart <hello@mermaidchart.com>

.changeset/ninety-adults-wink.md

@@ -0,0 +1,5 @@
+---
+'mermaid': major
+---
+
+Currently, HTML tags such as <em>, <strong>, <sup>, <a>, <ul>, and <li> are supported in Flowchart and Class diagram labels but not in Timeline diagrams. This change introduces support for basic HTML formatting in Timeline labels, enabling richer text formatting and better usability for multi-line content like descriptions, footnotes, and styled annotations

cypress/integration/rendering/timeline.spec.ts

@@ -225,4 +225,24 @@ timeline
       {}
     );
   });
+  it('13: should render markdown htmlLabels', () => {
+    imgSnapshotTest(
+      `---
+config:
+    theme: forest
+---
+
+ timeline
+    title Timeline of Industrial Revolution
+    section 17th-20th century
+        Industry 1.0 : Machinery, Water power, Steam <br>power
+        Industry 2.0 : Electricity, <strong>Internal combustion engine </strong>, Mass production
+        Industry 3.0 : Electronics, Computers, Automation
+    section 21st century
+        Industry 4.0 : Internet, Robotics, Internet of Things
+        Industry 5.0 : Artificial intelligence, Big data, 3D printing
+      `,
+      {}
+    );
+  });
 });

packages/mermaid/src/diagrams/timeline/svgDraw.js

@@ -1,6 +1,91 @@
 import { arc as d3arc, select } from 'd3';
+import { createText } from '../../rendering-util/createText.js';
+import DOMPurify from 'dompurify';
+
 const MAX_SECTIONS = 12;
 
+/**
+ * Process HTML content in node descriptions
+ * @param {object} textElem - The SVG element to append text to
+ * @param {object} node - The node object containing description and dimensions
+ * @param {object} conf - Configuration object
+ * @param {boolean} isVirtual - Whether this is for virtual height calculation
+ */
+const processHtmlContent = async function (textElem, node, conf, isVirtual = false) {
+  // Create temporary text to get initial dimensions
+  const sanitizedHtml = DOMPurify.sanitize(node.descr, { ALLOWED_TAGS: [] });
+  const tempText = textElem
+    .append('text')
+    .text(sanitizedHtml)
+    .attr('dy', '1em')
+    .attr('alignment-baseline', 'middle')
+    .attr('dominant-baseline', 'middle')
+    .attr('text-anchor', 'middle')
+    .call(wrap, node.width);
+
+  if (!isVirtual) {
+    tempText.attr('visibility', 'hidden');
+  }
+
+  const bbox = tempText.node().getBBox();
+  tempText.remove();
+
+  // Create the actual HTML content
+  const textObj = await createText(
+    textElem,
+    node.descr,
+    {
+      useHtmlLabels: true,
+      width: node.width,
+      classes: 'timeline-node-label',
+      isNode: true,
+    },
+    conf
+  );
+
+  if (!isVirtual) {
+    select(textObj).attr('transform', 'translate(0, 0)');
+  }
+
+  // Process the foreign object
+  const foreignObject = textElem.select('foreignObject');
+  if (foreignObject.node()) {
+    foreignObject.attr('width', `${10 * node.width}px`).attr('height', `${10 * node.width}px`);
+
+    const div = foreignObject.select('div');
+    if (div.node()) {
+      div
+        .style('display', 'table-cell')
+        .style('white-space', 'nowrap')
+        .style('line-height', '1.5')
+        .style('max-width', node.width + 'px')
+        .style('text-align', 'center');
+
+      let divBBox = div.node().getBoundingClientRect();
+
+      if (divBBox.width === node.width) {
+        div
+          .style('display', 'table')
+          .style('white-space', 'break-spaces')
+          .style('width', node.width + 'px');
+
+        divBBox = div.node().getBoundingClientRect();
+      }
+
+      foreignObject.attr('width', node.width).attr('height', divBBox.height);
+
+      if (!isVirtual) {
+        foreignObject.attr('x', -node.width / 2).attr('y', 3);
+
+        div.style('width', node.width + 'px');
+      }
+      bbox.height = divBBox.height;
+    }
+  }
+
+  return bbox;
+};
+
 export const drawRect = function (elem, rectData) {
   const rectElem = elem.append('rect');
   rectElem.attr('x', rectData.x);
@@ -409,6 +494,9 @@ const _drawTextCandidateFunc = (function () {
       .style('display', 'table-cell')
       .style('text-align', 'center')
       .style('vertical-align', 'middle')
+      .style('word-wrap', 'break-word')
+      .style('overflow-wrap', 'break-word')
+      .style('white-space', 'normal')
       .text(content);
 
     byTspan(content, body, x, y, width, height, textAttrs, conf);
@@ -493,7 +581,7 @@ function wrap(text, width) {
   });
 }
 
-export const drawNode = function (elem, node, fullSection, conf) {
+export const drawNode = async function (elem, node, fullSection, conf) {
   const section = (fullSection % MAX_SECTIONS) - 1;
   const nodeElem = elem.append('g');
   node.section = section;
@@ -506,19 +594,28 @@ export const drawNode = function (elem, node, fullSection, conf) {
   // Create the wrapped text element
   const textElem = nodeElem.append('g');
 
-  const txt = textElem
+  const hasHtml = /<[a-z][\S\s]*>/i.test(node.descr);
-    .append('text')
+
-    .text(node.descr)
+  if (hasHtml) {
-    .attr('dy', '1em')
+    const bbox = await processHtmlContent(textElem, node, conf, false);
-    .attr('alignment-baseline', 'middle')
+    node.height = bbox.height + node.padding;
-    .attr('dominant-baseline', 'middle')
+    node.height = Math.max(node.height, node.maxHeight);
-    .attr('text-anchor', 'middle')
+    node.width = node.width + 2 * node.padding;
-    .call(wrap, node.width);
+  } else {
-  const bbox = txt.node().getBBox();
+    const txt = textElem
-  const fontSize = conf.fontSize?.replace ? conf.fontSize.replace('px', '') : conf.fontSize;
+      .append('text')
-  node.height = bbox.height + fontSize * 1.1 * 0.5 + node.padding;
+      .text(node.descr)
-  node.height = Math.max(node.height, node.maxHeight);
+      .attr('dy', '1em')
-  node.width = node.width + 2 * node.padding;
+      .attr('alignment-baseline', 'middle')
+      .attr('dominant-baseline', 'middle')
+      .attr('text-anchor', 'middle')
+      .call(wrap, node.width);
+    const bbox = txt.node().getBBox();
+    const fontSize = conf.fontSize?.replace ? conf.fontSize.replace('px', '') : conf.fontSize;
+    node.height = bbox.height + fontSize * 1.1 * 0.5 + node.padding;
+    node.height = Math.max(node.height, node.maxHeight);
+    node.width = node.width + 2 * node.padding;
+  }
 
   textElem.attr('transform', 'translate(' + node.width / 2 + ', ' + node.padding / 2 + ')');
 
@@ -528,17 +625,25 @@ export const drawNode = function (elem, node, fullSection, conf) {
   return node;
 };
 
-export const getVirtualNodeHeight = function (elem, node, conf) {
+export const getVirtualNodeHeight = async function (elem, node, conf) {
   const textElem = elem.append('g');
-  const txt = textElem
+
-    .append('text')
+  const hasHtml = /<[a-z][\S\s]*>/i.test(node.descr);
-    .text(node.descr)
+
-    .attr('dy', '1em')
+  let bbox;
-    .attr('alignment-baseline', 'middle')
+  if (hasHtml) {
-    .attr('dominant-baseline', 'middle')
+    bbox = await processHtmlContent(textElem, node, conf, true);
-    .attr('text-anchor', 'middle')
+  } else {
-    .call(wrap, node.width);
+    const txt = textElem
-  const bbox = txt.node().getBBox();
+      .append('text')
+      .text(node.descr)
+      .attr('dy', '1em')
+      .attr('alignment-baseline', 'middle')
+      .attr('dominant-baseline', 'middle')
+      .attr('text-anchor', 'middle')
+      .call(wrap, node.width);
+    bbox = txt.node().getBBox();
+  }
   const fontSize = conf.fontSize?.replace ? conf.fontSize.replace('px', '') : conf.fontSize;
   textElem.remove();
   return bbox.height + fontSize * 1.1 * 0.5 + node.padding;

packages/mermaid/src/diagrams/timeline/timelineRenderer.ts

@@ -25,7 +25,7 @@ interface TimelineTask {
   score: number;
   events: string[];
 }
-export const draw = function (text: string, id: string, version: string, diagObj: Diagram) {
+export const draw = async function (text: string, id: string, version: string, diagObj: Diagram) {
   //1. Fetch the configuration
   const conf = getConfig();
   const LEFT_MARGIN = conf.timeline?.leftMargin ?? 50;
@@ -76,7 +76,7 @@ export const draw = function (text: string, id: string, version: string, diagObj
   let hasSections = true;
 
   //Calculate the max height of the sections
-  sections.forEach(function (section: string) {
+  for (const section of sections) {
     const sectionNode: Block<string, number> = {
       number: sectionNumber,
       descr: section,
@@ -85,10 +85,10 @@ export const draw = function (text: string, id: string, version: string, diagObj
       padding: 20,
       maxHeight: maxSectionHeight,
     };
-    const sectionHeight = svgDraw.getVirtualNodeHeight(svg, sectionNode, conf);
+    const sectionHeight = await svgDraw.getVirtualNodeHeight(svg, sectionNode, conf);
     log.debug('sectionHeight before draw', sectionHeight);
     maxSectionHeight = Math.max(maxSectionHeight, sectionHeight + 20);
-  });
+  }
 
   //tasks length and maxEventCount
   let maxEventCount = 0;
@@ -106,7 +106,7 @@ export const draw = function (text: string, id: string, version: string, diagObj
       padding: 20,
       maxHeight: maxTaskHeight,
     };
-    const taskHeight = svgDraw.getVirtualNodeHeight(svg, taskNode, conf);
+    const taskHeight = await svgDraw.getVirtualNodeHeight(svg, taskNode, conf);
     log.debug('taskHeight before draw', taskHeight);
     maxTaskHeight = Math.max(maxTaskHeight, taskHeight + 20);
 
@@ -123,9 +123,8 @@ export const draw = function (text: string, id: string, version: string, diagObj
         padding: 20,
         maxHeight: 50,
       };
-      maxEventLineLengthTemp += svgDraw.getVirtualNodeHeight(svg, eventNode, conf);
+      maxEventLineLengthTemp += await svgDraw.getVirtualNodeHeight(svg, eventNode, conf);
     }
-    // Add spacing between events (10px per event except the last one)
     if (task.events.length > 0) {
       maxEventLineLengthTemp += (task.events.length - 1) * 10;
     }
@@ -136,7 +135,7 @@ export const draw = function (text: string, id: string, version: string, diagObj
   log.debug('maxTaskHeight before draw', maxTaskHeight);
 
   if (sections && sections.length > 0) {
-    sections.forEach((section) => {
+    for (const section of sections) {
       //filter task where tasks.section == section
       const tasksForSection = tasks.filter((task) => task.section === section);
 
@@ -150,7 +149,7 @@ export const draw = function (text: string, id: string, version: string, diagObj
       };
       log.debug('sectionNode', sectionNode);
       const sectionNodeWrapper = svg.append('g');
-      const node = svgDraw.drawNode(sectionNodeWrapper, sectionNode, sectionNumber, conf);
+      const node = await svgDraw.drawNode(sectionNodeWrapper, sectionNode, sectionNumber, conf);
       log.debug('sectionNode output', node);
 
       sectionNodeWrapper.attr('transform', `translate(${masterX}, ${sectionBeginY})`);
@@ -159,7 +158,7 @@ export const draw = function (text: string, id: string, version: string, diagObj
 
       //draw tasks for this section
       if (tasksForSection.length > 0) {
-        drawTasks(
+        await drawTasks(
           svg,
           tasksForSection,
           sectionNumber,
@@ -178,11 +177,11 @@ export const draw = function (text: string, id: string, version: string, diagObj
 
       masterY = sectionBeginY;
       sectionNumber++;
-    });
+    }
   } else {
     //draw tasks
     hasSections = false;
-    drawTasks(
+    await drawTasks(
       svg,
       tasks,
       sectionNumber,
@@ -236,7 +235,7 @@ export const draw = function (text: string, id: string, version: string, diagObj
   // addSVGAccessibilityFields(diagObj.db, diagram, id);
 };
 
-export const drawTasks = function (
+export const drawTasks = async function (
   diagram: Selection<SVGElement, unknown, null, undefined>,
   tasks: TimelineTask[],
   sectionColor: number,
@@ -265,7 +264,7 @@ export const drawTasks = function (
     // create task wrapper
 
     const taskWrapper = diagram.append('g').attr('class', 'taskWrapper');
-    const node = svgDraw.drawNode(taskWrapper, taskNode, sectionColor, conf);
+    const node = await svgDraw.drawNode(taskWrapper, taskNode, sectionColor, conf);
     const taskHeight = node.height;
     //log task height
     log.debug('taskHeight after draw', taskHeight);
@@ -282,7 +281,7 @@ export const drawTasks = function (
       //add margin to task
       masterY += 100;
       lineLength =
-        lineLength + drawEvents(diagram, task.events, sectionColor, masterX, masterY, conf);
+        lineLength + (await drawEvents(diagram, task.events, sectionColor, masterX, masterY, conf));
       masterY -= 100;
 
       lineWrapper
@@ -307,7 +306,7 @@ export const drawTasks = function (
   masterY = masterY - 10;
 };
 
-export const drawEvents = function (
+export const drawEvents = async function (
   diagram: Selection<SVGElement, unknown, null, undefined>,
   events: string[],
   sectionColor: number,
@@ -334,7 +333,7 @@ export const drawEvents = function (
     log.debug('eventNode', eventNode);
     // create event wrapper
     const eventWrapper = diagram.append('g').attr('class', 'eventWrapper');
-    const node = svgDraw.drawNode(eventWrapper, eventNode, sectionColor, conf);
+    const node = await svgDraw.drawNode(eventWrapper, eventNode, sectionColor, conf);
     const eventHeight = node.height;
     maxEventHeight = maxEventHeight + eventHeight;
     eventWrapper.attr('transform', `translate(${masterX}, ${masterY})`);