myhtml

Fast HTML5 Parser that includes CSS selectors html parser fast myhtml

HTML/XML Parsing

1.5.9 Latest release released 6 months ago

kostya/myhtml

6 months ago

156 11

Kostya M

CrystalDocs.info Source

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.

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 |

myhtml

MyHTML

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

Installation

Usage example

Css selectors example

More Examples

Development Setup:

Benchmark

Authors

Dependencies 0

Development Dependencies 0

Dependents 10

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