ralger is a small web scraping framework for R based on rvest and xml2.
It's goal to simplify basic web scraping and it provides a convenient and easy to use API.
It offers functions for retrieving pages, parsing HTML using CSS selectors, automatic table parsing and
auto link, title, image and paragraph extraction.
Nestful is a Ruby library for making HTTP requests. It is designed to provide a simple, easy-to-use interface for making requests and handling responses. Nestful is often used for making requests to RESTful APIs.
One of the main features of Nestful is its ability to automatically parse JSON and XML responses and return them as Ruby objects.
This allows developers to easily access the data returned by an API without having to manually parse the response.
Netful is aimed at interacting with rest APIs and provides a convenient interface (see example below)
```r
library("ralger")
url <- "http://www.shanghairanking.com/rankings/arwu/2021"
# retrieve HTML and select elements using CSS selectors:
best_uni <- scrap(link = url, node = "a span", clean = TRUE)
head(best_uni, 5)
#> [1] "Harvard University"
#> [2] "Stanford University"
#> [3] "University of Cambridge"
#> [4] "Massachusetts Institute of Technology (MIT)"
#> [5] "University of California, Berkeley"
# ralger can also parse HTML attributes
attributes <- attribute_scrap(
link = "https://ropensci.org/",
node = "a", # the a tag
attr = "class" # getting the class attribute
)
head(attributes, 10) # NA values are a tags without a class attribute
#> [1] "navbar-brand logo" "nav-link" NA
#> [4] NA NA "nav-link"
#> [7] NA "nav-link" NA
#> [10] NA
#
# ralger can automatically scrape tables:
data <- table_scrap(link ="https://www.boxofficemojo.com/chart/top_lifetime_gross/?area=XWW")
head(data)
#> # A tibble: 6 × 4
#> Rank Title `Lifetime Gross` Year
#>
#> 1 1 Avatar $2,847,397,339 2009
#> 2 2 Avengers: Endgame $2,797,501,328 2019
#> 3 3 Titanic $2,201,647,264 1997
#> 4 4 Star Wars: Episode VII - The Force Awakens $2,069,521,700 2015
#> 5 5 Avengers: Infinity War $2,048,359,754 2018
#> 6 6 Spider-Man: No Way Home $1,901,216,740 2021
```
```ruby
require 'nestful'
# GET request
response = Nestful.get('http://httpbin.org/get')
puts response.body
puts response.code
puts response.headers
# POST request
response = Nestful.post(
'http://httpbin.org/post',
:format => :json, :payload => { :title => 'foo', :body => 'bar', :userId => 1 }
)
puts response.body
# establish interface to a specific API
class Charge < Nestful::Resource
endpoint 'https://api.stripe.com/v1/charges'
options :auth_type => :bearer, :password => 'sk_bar'
def self.all
self.new(get)
end
def self.find(id)
self.new(get(id))
end
def refund
post(:refund)
end
end
Charge.all #=> []
Charge.find('ch_bar').amount
```