MyHTML

Fast HTML5 Parser (Crystal binding for awesome lexborisov's myhtml and Modest). This shard used in production to parse millions of pages per day, very stable and fast.

Installation

Add this to your application's shard.yml:

dependencies:
  myhtml:
    github: kostya/myhtml

And run shards install

Usage example

require "myhtml"

html = <<-HTML
  <html>
    <body>
      <div id="t1" class="red">
        <a href="/#">O_o</a>
      </div>
      <div id="t2"></div>
    </body>
  </html>
HTML

myhtml = Myhtml::Parser.new(html)

myhtml.nodes(:div).each do |node|
  id = node.attribute_by("id")

  if first_link = node.scope.nodes(:a).first?
    href = first_link.attribute_by("href")
    link_text = first_link.inner_text

    puts "div with id #{id} have link [#{link_text}](#{href})"
  else
    puts "div with id #{id} have no links"
  end
end

# Output:
#   div with id t1 have link [O_o](/#)
#   div with id t2 have no links

Css selectors example

require "myhtml"

html = <<-HTML
  <html>
    <body>
      <table id="t1">
        <tr><td>Hello</td></tr>
      </table>
      <table id="t2">
        <tr><td>123</td><td>other</td></tr>
        <tr><td>foo</td><td>columns</td></tr>
        <tr><td>bar</td><td>are</td></tr>
        <tr><td>xyz</td><td>ignored</td></tr>
      </table>
    </body>
  </html>
HTML

myhtml = Myhtml::Parser.new(html)

p myhtml.css("#t2 tr td:first-child").map(&.inner_text).to_a
# => ["123", "foo", "bar", "xyz"]

p myhtml.css("#t2 tr td:first-child").map(&.to_html).to_a
# => ["<td>123</td>", "<td>foo</td>", "<td>bar</td>", "<td>xyz</td>"]

More Examples

examples

Development Setup:

git clone https://github.com/kostya/myhtml.git
cd myhtml
make
crystal spec

Benchmark

Parse 1000 times google page, and 1000 times css select. myhtml-program, crystagiri-program, nokogiri-program

Lang	Shard	Lib	Parse time, s	Css time, s	Memory, MiB
Crystal	lexbor	lexbor	2.66	-	8.1
Crystal	myhtml	myhtml(+modest)	3.06	0.15	10.6
Ruby 2.7	Nokogiri	libxml2	9.19	10.76	139.8
Crystal	Crystagiri	libxml2	11.27	-	25.0

Owner

kostya

github statistic

147
46
9
1
29 days ago
March 18, 2016

License

MIT License

Links

Homepage

Synced at

Mon, 02 Aug 2021 14:45:55 GMT