65 lines
2.1 KiB
JavaScript
65 lines
2.1 KiB
JavaScript
|
const { root } = require('mdast-builder');
|
||
|
|
const getAllBetween = require('../../../challenge-md-parser/mdx/plugins/utils/between-headings');
|
||
|
|
const {
|
||
|
|
splitOnThematicBreak
|
||
|
|
} = require('../../../challenge-md-parser/mdx/plugins/utils/split-on-thematic-break');
|
||
|
|
|
||
|
|
const { stringifyMd } = require('./text-to-data');
|
||
|
|
|
||
|
|
function plugin() {
|
||
|
|
return transformer;
|
||
|
|
|
||
|
|
function transformer(tree, file) {
|
||
|
|
const questionNodes = getAllBetween(tree, '--question--');
|
||
|
|
if (questionNodes.length > 0) {
|
||
|
|
const questionTree = root(questionNodes);
|
||
|
|
const textNodes = getAllBetween(questionTree, '--text--');
|
||
|
|
const answersNodes = getAllBetween(questionTree, '--answers--');
|
||
|
|
const solutionNodes = getAllBetween(questionTree, '--video-solution--');
|
||
|
|
|
||
|
|
const question = getQuestion(textNodes, answersNodes, solutionNodes);
|
||
|
|
|
||
|
|
file.data.question = question;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
function getQuestion(textNodes, answersNodes, solutionNodes) {
|
||
|
|
const text = stringifyMd(textNodes);
|
||
|
|
const answers = getAnswers(answersNodes);
|
||
|
|
const solution = getSolution(solutionNodes);
|
||
|
|
|
||
|
|
if (!text) throw Error('text is missing from question');
|
||
|
|
if (!answers) throw Error('answers are missing from question');
|
||
|
|
if (!solution) throw Error('solution is missing from question');
|
||
|
|
|
||
|
|
return { text, answers, solution };
|
||
|
|
}
|
||
|
|
|
||
|
|
function getAnswers(answersNodes) {
|
||
|
|
const answerGroups = splitOnThematicBreak(answersNodes);
|
||
|
|
return answerGroups.map(answer => stringifyMd(answer));
|
||
|
|
}
|
||
|
|
|
||
|
|
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);
|
||
|
|
if (Number.isNaN(solution)) throw Error('Not a number');
|
||
|
|
if (solution < 1) throw Error('Not positive number');
|
||
|
|
} catch (e) {
|
||
|
|
console.log(e);
|
||
|
|
throw Error('A video solution should be a positive integer');
|
||
|
|
}
|
||
|
|
|
||
|
|
return solution;
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = plugin;
|