refactor(parser): helper to get paragraph content (#56326)

tools/challenge-parser/parser/plugins/add-video-question.js

@@ -3,6 +3,7 @@ const find = require('unist-util-find');
 const { getSection } = require('./utils/get-section');
 const getAllBefore = require('./utils/before-heading');
 const mdastToHtml = require('./utils/mdast-to-html');
+const { getParagraphContent } = require('./utils/get-paragraph-content');
 
 const { splitOnThematicBreak } = require('./utils/split-on-thematic-break');
 
@@ -80,13 +81,7 @@ function getAnswers(answersNodes) {
 function getSolution(solutionNodes) {
   let solution;
   try {
-    if (solutionNodes.length > 1) throw Error('Too many nodes');
-    if (solutionNodes[0].children.length > 1)
-      throw Error('Too many child nodes');
-    const solutionString = solutionNodes[0].children[0].value;
-    if (solutionString === '') throw Error('Non-empty string required');
-
-    solution = Number(solutionString);
+    solution = Number(getParagraphContent(solutionNodes[0]));
     if (Number.isNaN(solution)) throw Error('Not a number');
     if (solution < 1) throw Error('Not positive number');
   } catch (e) {

tools/challenge-parser/parser/plugins/utils/get-paragraph-content.js

@@ -0,0 +1,7 @@
+const mdastToHtml = require('./mdast-to-html');
+
+function getParagraphContent(node) {
+  return node.type === 'paragraph' ? mdastToHtml(node.children) : null;
+}
+
+module.exports.getParagraphContent = getParagraphContent;

tools/challenge-parser/parser/plugins/utils/get-paragraph-content.test.js

@@ -0,0 +1,22 @@
+const parseFixture = require('../../__fixtures__/parse-fixture');
+const { getParagraphContent } = require('./get-paragraph-content');
+
+describe('getParagraphContent', () => {
+  let simpleAST;
+
+  beforeAll(async () => {
+    simpleAST = await parseFixture('simple.md');
+  });
+
+  it('should return the content of a paragraph node', () => {
+    const paragraphNode = simpleAST.children[1];
+    expect(paragraphNode.type).toBe('paragraph');
+    expect(getParagraphContent(paragraphNode)).toEqual('Paragraph 1');
+  });
+
+  it('should return null if the node is not a paragraph', () => {
+    const headingNode = simpleAST.children[0];
+    expect(headingNode.type).toBe('heading');
+    expect(getParagraphContent(headingNode)).toBeNull();
+  });
+});