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SEP 7
Title ItemLoader processors library
Author Ismael Carnales
Created 2009-08-10
Status Draft

SEP-007: ItemLoader processors library

This SEP proposes a library of ItemLoader processor to ship with Scrapy.

date.py

to_date

Converts a date string to a YYYY-MM-DD one suitable for DateField

Decision: Obsolete. DateField doesn't exists anymore.

extraction.py

extract

This adaptor tries to extract data from the given locations. Any XPathSelector in it will be extracted, and any other data will be added as-is to the result.

Decision: Obsolete. Functionality included in XpathLoader.

ExtractImageLinks

This adaptor may receive either XPathSelectors pointing to the desired locations for finding image urls, or just a list of XPath expressions (which will be turned into selectors anyway).

Decision: XXX

markup.py

remove_tags

Factory that returns an adaptor for removing each tag in the tags parameter found in the given value. If no tags are specified, all of them are removed.

Decision: XXX

remove_root

This adaptor removes the root tag of the given string/unicode, if it's found.

Decision: XXX

replace_escape

Factory that returns an adaptor for removing/replacing each escape character in the wich_ones parameter found in the given value.

Decision: XXX

unquote

This factory returns an adaptor that receives a string or unicode, removes all of the CDATAs and entities (except the ones in CDATAs, and the ones you specify in the keep parameter) and then, returns a new string or unicode.

Decision: XXX

misc.py

to_unicode

Receives a string and converts it to unicode using the given encoding (if specified, else utf-8 is used) and returns a new unicode object. E.g:

>> to_unicode('it costs 20\xe2\x82\xac, or 30\xc2\xa3')
[u'it costs 20\u20ac, or 30\xa3']

Decision: XXX

clean_spaces

Converts multispaces into single spaces for the given string. E.g:

>> clean_spaces(u'Hello   sir')
u'Hello sir'

Decision: XXX

drop_empty

Removes any index that evaluates to None from the provided iterable. E.g:

>> drop_empty([0, 'this', None, 'is', False, 'an example'])
['this', 'is', 'an example']

Decision: Obsolete. Functionality included in reducers.

delist

This factory returns and adaptor that joins an iterable with the specified delimiter.

Decision: Obsolete. Functionality included in reducers.

Regex

This adaptor must receive either a list of strings or an XPathSelector and return a new list with the matches of the given strings with the given regular expression (which is passed by a keyword argument, and is mandatory for this adaptor).

Decision: XXX