33 lines
987 B
JavaScript
33 lines
987 B
JavaScript
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const chunk = require('lodash/chunk');
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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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function plugin() {
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return transformer;
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function transformer(tree, file) {
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const hintNodes = getAllBetween(tree, '--hints--');
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if (hintNodes.length % 2 !== 0)
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throw Error('Tests must be in (text, ```testString```) order');
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const tests = chunk(hintNodes, 2).map(getTest);
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file.data.tests = tests;
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}
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}
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function getTest(hintNodes) {
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const [textNode, testStringNode] = hintNodes;
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const text = mdastToHtml([textNode]);
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const testString = testStringNode.value;
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if (!text) throw Error('text is missing from hint');
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// stub tests (i.e. text, but no testString) are allowed, but the md must
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// have a code block, even if it is empty.
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if (!testString && testString !== '')
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throw Error('testString (code block) is missing from hint');
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return { text, testString };
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}
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module.exports = plugin;
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