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var Immutable = require('immutable');
/**
Encode an article for next/prev
@param {Map<String:Page>}
@param {Article}
@return {Object}
*/
function encodeArticle(pages, article) {
var articlePath = article.getPath();
return {
path: articlePath,
title: article.getTitle(),
level: article.getLevel(),
exists: (articlePath && pages.has(articlePath)),
external: article.isExternal()
};
}
/**
this.navigation is a deprecated property from GitBook v2
@param {Output}
@return {Object}
*/
function encodeNavigation(output) {
var book = output.getBook();
var pages = output.getPages();
var summary = book.getSummary();
var articles = summary.getArticlesAsList();
var navigation = articles
.map(function(article, i) {
var ref = article.getRef();
if (!ref) {
return undefined;
}
var prev = articles.get(i - 1);
var next = articles.get(i + 1);
return [
ref,
{
index: i,
title: article.getTitle(),
introduction: (i === 0),
prev: prev? encodeArticle(pages, prev) : undefined,
next: next? encodeArticle(pages, next) : undefined,
level: article.getLevel()
}
];
})
.filter(function(e) {
return Boolean(e);
});
return Immutable.Map(navigation).toJS();
}
module.exports = encodeNavigation;
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