Skip to content
/ myhtml Public

Fast HTML5 Parser with css selectors for Crystal language

License

Notifications You must be signed in to change notification settings

kostya/myhtml

Repository files navigation

MyHTML

Build Status

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.

WARNING: original libraries (myhtml and Modest) not maintained since july 2020, i recommend switch to successor parser: Lexbor.

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(600Kb), 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 2.54 0.099 7.8
Crystal myhtml myhtml(+modest) 3.17 0.16 8.4
Ruby 2.7 Nokogiri libxml2 9.19 10.76 139.8
Crystal Crystagiri libxml2 11.27 - 25.0

About

Fast HTML5 Parser with css selectors for Crystal language

Topics

Resources

License

Stars

Watchers

Forks

Packages

No packages published

Languages