An Html parser library for Crystal (like Nokogiri for Ruby)
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README.md

Crystagiri

An HTML parser library for Crystal like the amazing Nokogiri Ruby gem.

I won't pretend that Crystagiri does much as Nokogiri. All help is welcome! :)

Installation

Add this to your application's shard.yml:

dependencies:
  crystagiri:
    github: madeindjs/crystagiri

and then run

$ crystal deps

Usage

require "crystagiri"

Then you can simply instantiate a Crystagiri::HTML object from an HTML String like this

doc = Crystagiri::HTML.new "<h1>Crystagiri is awesome!!</h1>"

... or directly load it from a Web URL or a pathname:

doc = Crystagiri::HTML.from_file "README.md"
doc = Crystagiri::HTML.from_url "http://example.com/"

Then you can search all XML::Nodes from the Crystagiri::HTML instance. The tags found will be Crystagiri::Tag objects with the .node property:

  • CSS query
puts doc.css("li > strong.title") { |tag| puts tag.node}
# => <strong class="title"> .. </strong>
# => <strong class="title"> .. </strong>

Known limitations: Currently, you can't use CSS queries with complex search specifiers like :nth-child

  • HTML tag
doc.where_tag("h2") { |tag| puts tag.content }
# => Development
# => Contributing
  • HTML id
puts doc.at_id("main-content").tagname
# => div
  • HTML class attribute
doc.where_class("summary") { |tag| puts tag.node }
# => <div class="summary"> .. </div>
# => <div class="summary"> .. </div>
# => <div class="summary"> .. </div>

Benchmark

I know you love benchmarks between Ruby & Crystal, so here's one:

require "nokogiri"
t1 = Time.now
doc = Nokogiri::HTML File.read("spec/fixture/HTML.html")
1..100000.times do
  doc.at_css("h1")
  doc.css(".step-title"){ |tag| tag }
end
puts "executed in #{Time.now - t1} milliseconds"

executed in 00:00:15.19 seconds with Ruby 2.4.1 with RVM

require "crystagiri"
t = Time.now
doc = Crystagiri::HTML.from_file "./spec/fixture/HTML.html"
1..100000.times do
  doc.at_css("h1")
  doc.css(".step-title") { |tag| tag }
end
puts "executed in #{Time.now - t} milliseconds"

executed in 00:00:04.40 seconds on Crystal 0.24.2 on LLVM 4.0.0 with release flag

Crystagiri is three time faster than Nokogiri!!

Development

Clone this repository and navigate to it:

$ git clone https://github.com/madeindjs/crystagiri.git
$ cd crystagiri

You can generate all documentation with

$ crystal doc

And run spec tests to ensure everything works correctly

$ crystal spec

Contributing

  1. Fork it ( https://github.com/madeindjs/crystagiri/fork )
  2. Create your feature branch git checkout -b my-new-feature
  3. Commit your changes git commit -am "Add some feature"
  4. Push to the branch git push origin my-new-feature
  5. Create a new Pull Request

Contributors