125 lines
3.3 KiB
JavaScript
125 lines
3.3 KiB
JavaScript
const visit = require('unist-util-visit');
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const { selectAll, select } = require('hast-util-select');
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const { sectionFilter } = require('./utils');
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const seedRE = /(.+)-seed$/;
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const headRE = /(.+)-setup$/;
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const tailRE = /(.+)-teardown$/;
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const editableRegionMarker = '--fcc-editable-region--';
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function defaultFile(lang) {
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return {
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key: `index${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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};
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}
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function createCodeGetter(codeKey, regEx, seeds) {
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return container => {
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const {
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properties: { id }
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} = container;
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const lang = id.match(regEx)[1];
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const key = `index${lang}`;
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const code = select('code', container).children[0].value;
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if (key in seeds) {
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seeds[key] = {
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...seeds[key],
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[codeKey]: code
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};
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} else {
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seeds[key] = {
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...defaultFile(lang),
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[codeKey]: code
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};
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}
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};
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}
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// TODO: any reason to worry about CRLF?
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function findRegionMarkers(file) {
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const lines = file.contents.split('\n');
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const editableLines = lines
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.map((line, id) => (line.trim() === editableRegionMarker ? id : -1))
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.filter(id => id >= 0);
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if (editableLines.length > 2) {
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throw Error('Editable region has too many markers' + editableLines);
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}
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if (editableLines.length === 0) {
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return null;
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} else if (editableLines.length === 1) {
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throw Error(`Editable region not closed`);
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} else {
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return editableLines;
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}
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}
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function removeLines(contents, toRemove) {
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const lines = contents.split('\n');
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return lines.filter((_, id) => !toRemove.includes(id)).join('\n');
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}
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function createPlugin() {
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return function transformer(tree, file) {
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function visitor(node) {
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if (sectionFilter(node, 'challengeSeed')) {
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let seeds = {};
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const codeDivs = selectAll('div', node);
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const seedContainers = codeDivs.filter(({ properties: { id } }) =>
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seedRE.test(id)
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);
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seedContainers.forEach(createCodeGetter('contents', seedRE, seeds));
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const headContainers = codeDivs.filter(({ properties: { id } }) =>
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headRE.test(id)
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);
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headContainers.forEach(createCodeGetter('head', headRE, seeds));
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const tailContainers = codeDivs.filter(({ properties: { id } }) =>
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tailRE.test(id)
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);
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tailContainers.forEach(createCodeGetter('tail', tailRE, seeds));
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file.data = {
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...file.data,
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files: seeds
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};
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// TODO: make this readable.
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Object.keys(seeds).forEach(key => {
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const fileData = seeds[key];
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const editRegionMarkers = findRegionMarkers(fileData);
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if (editRegionMarkers) {
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fileData.contents = removeLines(
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fileData.contents,
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editRegionMarkers
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);
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if (editRegionMarkers[1] <= editRegionMarkers[0]) {
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throw Error('Editable region must be non zero');
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}
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fileData.editableRegionBoundaries = editRegionMarkers;
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} else {
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fileData.editableRegionBoundaries = [];
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}
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});
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// TODO: TESTS!
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}
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}
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visit(tree, 'element', visitor);
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};
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}
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exports.challengeSeedToData = createPlugin;
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exports.createCodeGetter = createCodeGetter;
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exports.defaultFile = defaultFile;
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