November 2012
Intermediate to advanced
888 pages
54h 46m
Polish
Content preview from Ruby. Receptury
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11.13. Ekstrakcja wszystkich adresów URL z dokumentu HTML
Problem
Chcemy odnaleźć wszystkie lokalizatory URL na danej stronie WWW.
Rozwiązanie
Czy chodzi jedynie o hiperłącza (czyli URL-e stanowiące wartość atrybutu HREF w znaczniku <A)? Czy może interesują nas również URL-e w osadzonych obiektach — obrazkach lub apletach? A może po prostu chcemy odnaleźć wszystkie URL-e, także te wymienione w treści strony?
Wbrew pozorom, ten ostatni przypadek jest najprostszy. Ekstrakcję URL-i przeprowadzić można za pomocą metody URI.extract; możemy zażądać wyodrębnienia wszystkich URL-i w danym łańcuchu bądź ograniczyć się tylko do ich podzbioru. W poniższym przykładzie wykorzystujemy zarówno pierwszą, jak i drugą możliwość:
require 'uri' text = ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.