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meeseeks

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开发语言 HTML/CSS

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软件概览

Meeseeks

Meeseeks is an Elixir library for parsing and extracting data from HTML and XML with CSS or XPath selectors.

import Meeseeks.CSS

html = HTTPoison.get!("https://news.ycombinator.com/").body

for story <- Meeseeks.all(html, css("tr.athing")) do
  title = Meeseeks.one(story, css(".title a"))

  %{
    title: Meeseeks.text(title),
    url: Meeseeks.attr(title, "href")
  }
end
#=> [%{title: "...", url: "..."}, %{title: "...", url: "..."}, ...]

Features

Friendly API
Browser-grade HTML5 parser
Permissive XML parser
CSS and XPath selectors
Supports custom selectors
Helpers to extract data from selections

Compatibility

Meeseeks requires a minimum combination of Elixir 1.7.0 and Erlang/OTP 21, and has been tested with a maximum combination of Elixir 1.12.0 and Erlang/OTP 24.0.

Installation

Meeseeks depends on html5ever via meeseeks_html5ever.

Because html5ever is a Rust library, you will need to have the Rust compiler installed wherever Meeseeks is compiled.

Ensure Rust is installed, then add Meeseeks to your mix.exs:

defp deps do
  [
    {:meeseeks, "~> 0.16.0"}
  ]
end

Finally, run mix deps.get.

Getting Started

Parse

Start by parsing a source (HTML/XML string or Meeseeks.TupleTree) into a Meeseeks.Document so that it can be queried.

Meeseeks.parse/1 parses the source as HTML, but Meeseeks.parse/2 accepts a second argument of either :html, :xml, or :tuple_tree that specifies how the source is parsed.

document = Meeseeks.parse("<div id=main><p>1</p><p>2</p><p>3</p></div>")
#=> #Meeseeks.Document<{...}>

The selection functions accept an unparsed source, parsing it as HTML, but parsing is expensive so parse ahead of time when running multiple selections on the same document.

Select

Next, use one of Meeseeks's selection functions - fetch_all, all, fetch_one, or one - to search for nodes.

All these functions accept a queryable (a source, a document, or a Meeseeks.Result), one or more Meeseeks.Selectors, and optionally an initial context.

all returns a (possibly empty) list of results representing every node matching one of the provided selectors, while one returns a result representing the first node to match a selector (depth-first) or nil if there is no match.

fetch_all and fetch_one work like all and one respectively, but wrap the result in {:ok, ...} if there is a match or return {:error, %Meeseeks.Error{type: :select, reason: :no_match}} if there is not.

To generate selectors, use the css macro provided by Meeseeks.CSS or the xpath macro provided by Meeseeks.XPath.

import Meeseeks.CSS
result = Meeseeks.one(document, css("#main p"))
#=> #Meeseeks.Result<{ <p>1</p> }>

import Meeseeks.XPath
result = Meeseeks.one(document, xpath("//*[@id='main']//p"))
#=> #Meeseeks.Result<{ <p>1</p> }>

Extract

Retrieve information from the Meeseeks.Result with an extractor.

The included extractors are attr, attrs, data, dataset, html, own_text, tag, text, tree.

Meeseeks.tag(result)
#=> "p"
Meeseeks.text(result)
#=> "1"
Meeseeks.tree(result)
#=> {"p", [], ["1"]}

The extractors html and tree work on Meeseeks.Documents in addition to Meeseeks.Results.

Meeseeks.html(document)
#=> "<html><head></head><body><div id=\"main\"><p>1</p><p>2</p><p>3</p></div></body></html>"

Guides

Contributing

If you are interested in contributing please read the contribution guidelines.

License

The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copyof this software and associated documentation files (the "Software"), to dealin the Software without restriction, including without limitation the rightsto use, copy, modify, merge, publish, distribute, sublicense, and/or sellcopies of the Software, and to permit persons to whom the Software isfurnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included inall copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS ORIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THEAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHERLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS INTHE SOFTWARE.