November 2012
Intermediate to advanced
888 pages
54h 46m
Polish
Content preview from Ruby. Receptury
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12.12. Czytanie i zapisywanie plików konfiguracyjnych
Problem
Chcemy zapisać konfigurację aplikacji na dysku, w formacie możliwym do przetwarzania w języku Ruby, a jednocześnie takim, który można łatwo modyfikować za pomocą edytora tekstu.
Rozwiązanie
Dane konfiguracyjne można umieścić w strukturze danych i zapisać ją na dysk w formacie YAML. Jeśli wykorzystujemy jedynie wbudowane typy danych języka Ruby (łańcuchy, tablice, hasze itp.), pliki YAML będą miały postać czytelną dla ludzi.
require 'yaml' configuration = { 'color' => 'blue', 'font' => 'Septimus', 'font-size' => 7 } open('text.cfg', 'w') { |f| YAML.dump(configuration, f) } open('text.cfg') { |f| puts f.read } # --- # font-size: 7 # color: blue # font: Septimus open('text.cfg') ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.