64 lines
2.1 KiB
JavaScript
64 lines
2.1 KiB
JavaScript
const { root } = require('mdast-builder');
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const getAllBetween = require('./utils/between-headings');
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const mdastToHtml = require('./utils/mdast-to-html');
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const { splitOnThematicBreak } = require('./utils/split-on-thematic-break');
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function plugin() {
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return transformer;
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function transformer(tree, file) {
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const questionNodes = getAllBetween(tree, '--question--');
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if (questionNodes.length > 0) {
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const questionTree = root(questionNodes);
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const textNodes = getAllBetween(questionTree, '--text--');
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const answersNodes = getAllBetween(questionTree, '--answers--');
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const solutionNodes = getAllBetween(questionTree, '--video-solution--');
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const question = getQuestion(textNodes, answersNodes, solutionNodes);
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file.data.question = question;
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}
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}
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}
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function getQuestion(textNodes, answersNodes, solutionNodes) {
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const text = mdastToHtml(textNodes);
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const answers = getAnswers(answersNodes);
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const solution = getSolution(solutionNodes);
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if (!text) throw Error('text is missing from question');
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if (!answers) throw Error('answers are missing from question');
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if (!solution) throw Error('solution is missing from question');
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// console.log({ text, answers, solution });
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return { text, answers, solution };
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}
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function getAnswers(answersNodes) {
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const answerGroups = splitOnThematicBreak(answersNodes);
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return answerGroups.map(answer => mdastToHtml(answer));
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}
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function getSolution(solutionNodes) {
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let solution;
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try {
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if (solutionNodes.length > 1) throw Error('Too many nodes');
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if (solutionNodes[0].children.length > 1)
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throw Error('Too many child nodes');
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const solutionString = solutionNodes[0].children[0].value;
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if (solutionString === '') throw Error('Non-empty string required');
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solution = Number(solutionString);
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if (Number.isNaN(solution)) throw Error('Not a number');
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if (solution < 1) throw Error('Not positive number');
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} catch (e) {
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console.log(e);
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throw Error('A video solution should be a positive integer');
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}
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return solution;
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}
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module.exports = plugin;
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