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eventParser.js
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eventParser.js
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var cheerio = require('cheerio');
var request = require('request');
var Event = require('./event.js');
const baseUrl = "http://sssc.carleton.ca";
const eventsUrl = "/events";
var events = [];
// gathers the HTML from the events page
function scrape() {
console.log("Scraping " + baseUrl + eventsUrl + "...");
request(baseUrl + eventsUrl, function (error, response, body) {
if (!error && response.statusCode == 200) {
events = [];
parse(body);
} else {
failedScrape(error, response, body);
}
});
}
// parses a body of HTML to retrieve a list of events
function parse(body) {
const events$ = cheerio.load(body, {
normalizeWhitespace: true
});
events$('.event-listing--list-item').each(function(i, element) {
var event;
console.log("Processing event: " + i);
let element$ = cheerio.load(element);
let eventName = element$('.event-details--title').text().trim();
let eventUrl = element$('a').first().attr('href');
let eventDescription = "";
let eventDate = new Date();
let eventTime = "";
let eventLocation = "";
let eventImageUrl = "";
let eventActionUrl = "";
event = new Event(eventName, eventUrl);
request(baseUrl + eventUrl, function(error, response, body) {
if (!error && response.statusCode == 200) {
let event$ = cheerio.load(body, {
normalizeWhitespace: true
});
const rawEventDescription$ = cheerio.load((event$('.event--description').html()), {
normalizeWhitespace: true
});
eventImageUrl = rawEventDescription$('img').attr('src');
if (eventImageUrl) {
eventImageUrl = baseUrl + eventImageUrl;
}
let eventDescriptionHtml = event$('.event--description').html();
if (eventDescriptionHtml) {
eventDescription = convertToHtmlText(eventDescriptionHtml);
}
const eventDetails$ = cheerio.load((event$('.event--details').html()), {
normalizeWhitespace: true
});
eventDetails$('.row').each(function(i, detail) {
const detail$ = cheerio.load(detail);
let eventDetailRaw = detail$('.event-detail--content');
let eventDetail = eventDetailRaw.text().trim();
let eventDetailHtml = eventDetailRaw.html();
if (detail$('.fa-clock-o').length > 0) {
eventTime = detail$('.event-detail--content').text().trim();
} else if (detail$('.fa-leanpub').length > 0) {
if (eventDetailHtml) {
eventActionUrl = detail$('a').first().attr('href');
}
} else if (detail$('.fa-map-marker').length > 0) {
eventLocation = eventDetail;
} else if (detail$('.fa-calendar').length > 0) {
eventDate = new Date(Date.parse(eventDetailRaw.find('time').attr('datetime')))
}
});
event.setDetails(eventDescription, eventDate, eventTime, eventLocation, eventImageUrl, eventActionUrl);
event.print();
events.push(event);
} else {
failedScrape(error, response, body);
}
});
});
}
// strips out only certain HTML tags, so that things like lists and links are maintained in the apps
function convertToHtmlText(html) {
let whitelist = ['a', 'ul', 'ol', 'li'];
let normalizeListElementsRegexReplace1 = /<li>\s*<p>\s*/gi;
let normalizeListElementsRegexReplacement1 = '<li>';
let normalizeListElementsRegexReplace2 = /\s*<\/p>\s*<\/li>/gi;
let normalizeListElementsRegexReplacement2 = '</li>';
let normalizeListElementsRegexReplace3 = /<br \/>\s*<li>/gi
let normalizeListElementsRegexReplacement3 = '<li>';
let normalizeListElementsRegexReplace4 = /<br \/><\/ul>/gi
let normalizeListElementsRegexReplacement4 = '</ul><br />';
let normalizeListElementsRegexReplace5 = /<br \/><ul>/gi
let normalizeListElementsRegexReplacement5 = '<ul>';
if (html != null) {
html = html.replace(normalizeListElementsRegexReplace1, normalizeListElementsRegexReplacement1);
html = html.replace(normalizeListElementsRegexReplace2, normalizeListElementsRegexReplacement2);
}
whitelist.forEach(element => {
if (html != null) {
html = cheerio.load(html.split('<' + element + '>')
.join('{%' + element + '%}')
.split('<' + element)
.join('{%' + element)
.split('</' + element + '>')
.join('{%/' + element + '%}'), {
normalizeWhitespace: true
}).root().html();
}
});
if (html != null) {
html = cheerio.load(html, {
normalizeWhitespace: true
}).root().text();
}
whitelist.forEach(element => {
if (html != null) {
html = html.split('{%' + element + '%}')
.join('<' + element + '>')
.split('{%' + element)
.join('<' + element)
.split('{%/' + element + '%}')
.join('</' + element + '>');
}
});
if (html != null) {
return html.trim()
.split('\n')
.join('<br />')
.replace(normalizeListElementsRegexReplace3, normalizeListElementsRegexReplacement3)
.replace(normalizeListElementsRegexReplace4, normalizeListElementsRegexReplacement4)
.replace(normalizeListElementsRegexReplace5, normalizeListElementsRegexReplacement5)
.toString();
}
return "";
}
// scraping went wrong (oh no)
function failedScrape(error, response, body) {
console.log("Failed to scrape events.");
console.log('error:', error);
console.log('statusCode:', response && response.statusCode);
console.log('body:', body);
}
// retrieves the list of events as JSON
function getEvents() {
console.log("Retrieving events...");
events.forEach(function(event) {
event.print();
});
return JSON.stringify(events);
}
module.exports.scrape = scrape;
module.exports.getEvents = getEvents;