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Declarative hypertext client

Project description

Declarative hypertext client

Installation

pip install peppertext

Overview

from peppertext import Hypertext, SimpleURLField, resolve, register, selector

@register
class GoogleBlogPage(Hypertext):
    url = SimpleURLField(
        "https://googleblog.blogspot.kr/{year}/{month}/{title}.html"
    )

    title = selector.find(".title[itemprop=name]").text()
    body = selector.find(".post-body").text()

It resolves given headers, url and query string to hypertext object.

>>> p = resolve("https://googleblog.blogspot.kr/2015/11/google-gobble-thanksgiving-trends-on.html")
>>> p
<GoogleBlogPage at 0x108a4d1f0 >

>>> p.fetch()
>>> p['title']
'Google gobble: Thanksgiving trends on Search'
>>> p['body']
'In just a few hours, people across the U.S. will be settling...'

You can create GoogleBlogPage object with profile variables which are declared as fields in GoogleBlogPage class.

>>> p = GoogleBlogPage(
...     year="2015",
...     month="11",
...     title="google-gobble-thanksgiving-trends-on"
... )

>>> p.fetch()
>>> p['title']
'Google gobble: Thanksgiving trends on Search'

Selectors

class GoogleBlogPage(Hypertext):
    # ...
    title = selector.find(".title[itemprop=name]").text()
    # ...

Selectors process a document which is returned from server as response. In the GoogleBlogPage example above, title selector parses document and find an element specified with “.title[itemprop=name]” css selector. You can access the value title with subscribing the GoogleBlogPage object with selector name.

document = pq("""<div>
    <a href="http://example.com">Link1</a>
    <a href="http://example.com/dahokan">Link2</a>
    <a href="http://example.com/manoha">Link3</a>
</div>""")

find_selector = selector.find('a')
selected_els = find_selector.select(document)
self.assertEqual( [pq(el).attr["href"] for el in selected_els],
    [
        "http://example.com",
        "http://example.com/dahokan",
        "http://example.com/manoha"
    ]
)

find

Select html elements which match to given css selector string.

attribute

Get an element’s attribute value with given attribute name.

text

Select the html element’s inner text value.

at

Get an item on index

sub

sub_selector = selector.sub(pattern="\d+", repl="")

Do regex substitution.

cast

int_cast_selector = selector.cast(int)

Pass the data to the function given as a parameter.

Compatibility

Peppertext supports Python 2.7 and 3.

Features in developing

  • Interface for parse error handling
  • Polymorphic access to page selectors
  • Interface to resolve and traverse links in a page

Project details


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