85 lines
2.2 KiB
JavaScript
85 lines
2.2 KiB
JavaScript
const is = require('unist-util-is');
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const position = require('unist-util-position');
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const { isEmpty } = require('lodash');
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const getId = require('./get-id');
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const keyToSection = {
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head: 'before-user-code',
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tail: 'after-user-code'
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};
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const supportedLanguages = ['js', 'css', 'html', 'jsx', 'py'];
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function defaultFile(lang, id) {
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return {
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key: `index${lang}`,
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ext: lang,
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name: 'index',
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contents: '',
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head: '',
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tail: '',
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id
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};
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}
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function getFileVisitor(seeds, seedKey, validate) {
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return (node, index, parent) => {
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if (is(node, 'root')) return;
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if (is(node, 'code')) {
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codeToData(node, seeds, seedKey, validate);
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return;
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}
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idToData(node, index, parent, seeds);
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};
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}
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function codeToData(node, seeds, seedKey, validate) {
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if (validate) validate(node);
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const lang = node.lang;
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if (!supportedLanguages.includes(lang))
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throw Error(`On line ${
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position.start(node).line
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} '${lang}' is not a supported language.
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Please use one of js, css, html, jsx or py
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`);
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const key = `index${lang}`;
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const id = seeds[key] ? seeds[key].id : '';
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// the contents will be missing if there is an id preceding this code
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// block.
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if (!seeds[key]) {
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seeds[key] = defaultFile(lang, id);
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}
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if (isEmpty(node.value) && seedKey !== 'contents') {
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const section = keyToSection[seedKey];
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throw Error(`Empty code block in --${section}-- section`);
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}
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seeds[key][seedKey] = isEmpty(seeds[key][seedKey])
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? node.value
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: seeds[key][seedKey] + '\n' + node.value;
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}
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function idToData(node, index, parent, seeds) {
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const id = getId(node);
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// If this is reached, the node type is neither root nor code. If it is not
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// an id, there must be a syntax error.
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if (!id) {
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throw Error(
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'Unexpected syntax in seed/solution. Must be ::id{#id} or a code ' +
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'block (```) \n'
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);
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}
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const codeNode = parent.children[index + 1];
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if (codeNode && is(codeNode, 'code')) {
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const key = `index${codeNode.lang}`;
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if (seeds[key]) throw Error('::id{#id}s must come before code blocks');
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seeds[key] = defaultFile(codeNode.lang, id);
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} else {
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throw Error('::id{#id}s must come before code blocks');
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}
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}
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module.exports.getFileVisitor = getFileVisitor;
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