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#!/usr/bin/env node
const cheerio = require("cheerio");
const fetch = require("node-fetch");
let query;
if (process.argv.length == 2) {
query = function(obj) {return true;};
} else if (process.argv.length == 3) {
const s = process.argv[2];
query = function(obj) {with (obj) return eval(s);};
} else {
console.log("Usage: ./filter.js 'period == 4 && slot[0] != \"D\"'");
process.exit(1);
}
function parseRow(row) {
if (row.length != 6) return null;
return {
period: row[0],
slot: row[1],
code: row[2],
year: row[3],
ects: row[4],
name: row[5],
};
}
function handle(html) {
const $ = cheerio.load(html);
let trs = [];
$("tbody").last().children("tr").each((_, e) =>
trs.push($(e).children("td").map((_, td) => $(td).text()).get())
);
trs = trs.map(r => parseRow(r)).filter(obj => obj != null);
trs.forEach(obj => {
if (query(obj)) console.log(JSON.stringify(obj));
});
}
fetch("http://www.cs.uu.nl/education/")
.then(res => res.text())
.then(body => handle(body))
.catch(err => console.error(err));
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