view_nav.js

#!/usr/bin/env node
const { categories } = require("./config");

const { normalize } = require("./src/util");
const { createDOM } = require("./src/env");

const byTitle = (title) => (a) => a.title === title;

const onlyObjects = (a) => /-objects\.html$/.test(a.link);
const toRepresentation = (a) => a.link.match(/([A-z]+)-objects\.html$/)[1];

/**
 * Grab all category defintions for navigation
 * from JavaScript in the page
 */
for (const _category of categories) {
	const category = normalize(_category);
	const { window } = createDOM(category, true);
	const { tocJSON } = window;

	if (!tocJSON) {
		console.log("failure to parse TOC on page", category);
		continue;
	}

	const items = tocJSON
		.find(byTitle("Reference"))
		.children[0].children.find(byTitle("Objects and Attributes"))
		.children.filter(onlyObjects)
		.map(toRepresentation);

	console.log("objects are", items);
	// only need a single version of tocJSON
	break;
}