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const dom = require('./dom');
const SELECTOR_LIST = 'ol, ul';
const SELECTOR_LINK = '> a, p > a';
const SELECTOR_PART = 'h2, h3, h4';
/**
* Find a list.
* @param {cheerio.Node}
* @return {cheerio.Node}
*/
function findList($parent) {
const $container = $parent.children('.olist');
if ($container.length > 0) $parent = $container.first();
return $parent.children(SELECTOR_LIST);
}
/**
* Parse a ul list and return list of chapters recursvely.
* @param {cheerio.Node}
* @param {cheerio.DOM}
* @return {Array}
*/
function parseList($ul, $) {
const articles = [];
$ul.children('li').each(function() {
const article = {};
const $li = $(this);
// Get text for the entry
const $p = $li.children('p');
article.title = ($p.text() || dom.textNode($li.get(0))).trim();
// Parse link
const $a = $li.find(SELECTOR_LINK);
if ($a.length > 0) {
article.title = $a.first().text();
article.ref = $a.attr('href').replace(/\\/g, '/').replace(/^\/+/, '');
}
// Sub articles
const $sub = findList($li);
article.articles = parseList($sub, $);
if (!article.title) return;
articles.push(article);
});
return articles;
}
/**
* Find all parts and their corresponding lists.
* @param {cheerio.Node}
* @param {cheerio.DOM}
* @return {Array<{title: String, list: cheerio.Node}>}
*/
function findParts($parent, $) {
// Find parts and lists
// TODO asciidoc compatibility
const partsAndLists = $parent.children(SELECTOR_LIST + ', ' + SELECTOR_PART);
// Group each part with the list after
const parts = [];
let previousPart = null;
partsAndLists.each((i, el) => {
if (isPartNode(el)) {
if (previousPart !== null) {
// The previous part was empty
parts.push(previousPart);
}
previousPart = {
title: getPartTitle(el, $),
list: null
};
} else { // It is a list
if (previousPart !== null) {
previousPart.list = el;
} else {
previousPart = {
title: '',
list: el
};
}
parts.push(previousPart);
previousPart = null;
}
});
// Last part might be empty
if (previousPart !== null) {
parts.push(previousPart);
}
return parts;
}
/**
* True if the element is a part.
* @param el
* @return {Boolean}
*/
function isPartNode(el) {
return SELECTOR_PART.indexOf(el.name) !== -1;
}
/**
* Parse the title of a part element.
* @param el
* @param {cheerio.DOM} $
* @return {String}
*/
function getPartTitle(el, $) {
return $(el).text().trim();
}
/**
* Parse an HTML content into a tree of articles/parts.
* @param {String} html
* @return {Object}
*/
function parseSummary(html) {
const $ = dom.parse(html);
const $root = dom.cleanup(dom.root($), $);
const parts = findParts($root, $);
// Parse each list
const parsedParts = [];
let part;
for (let i = 0; i < parts.length; ++i) {
part = parts[i];
parsedParts.push({
title: part.title,
articles: parseList($(part.list), $)
});
}
return {
parts: parsedParts
};
}
module.exports = parseSummary;
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