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g4g_crawl.js
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var request = require('sync-request')
var cheerio = require('cheerio')
var processImg = require('epub-crawler/src/img')
var fs = require('fs')
var req = require('epub-crawler/src/util').requestRetry
var selectors = {
'title': 'article>h1',
'content': 'article>.text',
'remove': 'script, ins, iframe, p:empty, pre:empty, #personalNoteDiv, #practiceLinkDiv, div[id^=AP], .code-output-container, .textBasedMannualAds, ._ap_apex_ad, div>br',
'tab': '.code-block',
'code': 'td.code',
'line': '.line',
'link': '.articles-list .content .head a',
'pageUrl': 'https://www.geeksforgeeks.org/{id}/',
'tocUrl': 'https://www.geeksforgeeks.org/category/{cate}/page/{i}/',
'exiName': 'g4g_exist.json',
}
var artTemp = '<html><body>\n<h1>{title}</h1>\n{content}\n</body></html>'
function processTab($, $tab) {
var $code = $tab.find(selectors.code).eq(0)
var $newCode = $('<pre></pre>')
var $lines = $code.find(selectors.line)
var lines = []
for (var i = 0; i < $lines.length; i++) {
lines.push($lines.eq(i).text())
}
$newCode.text(lines.join('\n'))
$tab.replaceWith($newCode)
}
function getArticle(html, url) {
var $ = cheerio.load(html)
if (selectors.remove)
$(selectors.remove).remove()
var $tabs = $(selectors.tab)
for(var i = 0; i < $tabs.length; i++) {
var $tab = $tabs.eq(i)
processTab($, $tab)
}
var title = '<h1>' +
$(selectors.title).eq(0).text().trim() + '</h1>'
var co = $(selectors.content).html()
co = `<blockquote>原文：<a href='${url}'>${url}</a></blockquote>${co}`
return {title: title, content: co}
}
function load_exist() {
var fname = selectors.exiName
if (!fs.existsSync(fname))
return new Set()
var li = JSON.parse(fs.readFileSync(fname, 'utf-8'))
console.log(`load ${li.length} existed`)
return new Set(li)
}
var exi = load_exist()
function download(id, dir='out') {
console.log(id)
if (fs.existsSync(`${dir}/${id}.html`))
return
if (exi.has(id)) return
var url = selectors.pageUrl.replace('{id}', id)
var html = req('GET', url).body.toString()
var art = getArticle(html, url)
var imgs = new Map()
art.content = processImg(art.content, imgs, {
'pageUrl': url,
'imgPrefix': 'img/',
})
try {fs.mkdirSync(dir)} catch {}
try {fs.mkdirSync(`${dir}/img`)} catch {}
html = artTemp.replace('{title}', art.title)
.replace('{content}', art.content)
fs.writeFileSync(`${dir}/${id}.html`, html)
for (var [name, img] of imgs.entries()) {
fs.writeFileSync(`${dir}/img/${name}`, img)
}
}
function batch(fname) {
var dir = fname.replace(/\.\w+$/, '')
var ids = fs.readFileSync(fname, 'utf-8')
.split('\n')
.map(x => x.trim())
.filter(x => x)
for (var id of ids)
download(id, dir)
}
function getIds(html) {
var $ = cheerio.load(html)
var $links = $(selectors.link)
var res = []
for (var i = 0; i < $links.length; i++) {
var url = $links.eq(i).attr('href')
if (!url) continue
res.push(url.split('/').slice(-2)[0])
}
return res
}
function fetch(fname, cate, st, ed) {
st = st || 1
ed = ed || 1000000
var ofile = fs.openSync(fname, 'a')
for (var i = st; i <= ed; i++) {
console.log(`page: ${i}`)
var url = selectors.tocUrl
.replace('{cate}', cate)
.replace('{i}', i.toString())
var html = req('GET', url).body.toString()
var ids = getIds(html)
if (ids.length == 0) break
fs.writeSync(ofile, `page: ${i}\n`)
ids = ids.filter(x => !exi.has(x))
for (var id of ids)
fs.writeSync(ofile, id + '\n')
}
}
function main() {
var cmd = process.argv[2]
if (cmd == 'download')
download(process.argv[3])
else if (cmd == 'batch')
batch(process.argv[3])
else if (cmd == 'fetch')
fetch(...process.argv.slice(3, 7))
}
if (require.main === module) main()