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