Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Liquid Markup
Search
Jon Daniel
October 04, 2012
Programming
1
180
Liquid Markup
Talk I gave October 4, 2012 at Pittsburgh Ruby Brigade.
Jon Daniel
October 04, 2012
Tweet
Share
More Decks by Jon Daniel
See All by Jon Daniel
Growth and Mentorship: Working with Junior Developers
binarycleric
0
43
Smart Software Design (SOA Edition)
binarycleric
0
120
Ethical and Sustainable On-Call
binarycleric
6
2.4k
Other Decks in Programming
See All in Programming
Findy - エンジニア向け会社紹介 / Findy Letter for Engineers
findyinc
2
74k
TypeScriptとGraphQLで実現する 型安全なAPI実装 / TSKaigi 2024
hokaccha
5
2.7k
『Railsオワコン』と言われる時代に、なぜブルーモ証券はRailsを選ぶのか
free_world21
2
480
Try creating your own orderedmap
kazamori
1
280
GNU Makeの使い方 / How to use GNU Make
kaityo256
PRO
13
4.3k
Webアプリをできるだけコードを手書きしないで作ってみる
tomokusaba
2
240
AmperとFleetを使ったAndroidアプリ
yoppie
0
300
GitHub Actionsの痒いところを埋めるサードパーティーランナー
dora1998
2
250
Direct Style Effect Systems The Print[A] ExampleA Comprehension Aid
philipschwarz
PRO
0
410
Timeline エディター拡張入門
yucchiy
0
450
『WordPressコミュニティで学ぶ』OSS貢献の多様性
ippey
0
230
Sheets API使ってみた
toshi0383
2
180
Featured
See All Featured
The Brand Is Dead. Long Live the Brand.
mthomps
49
30k
Producing Creativity
orderedlist
PRO
338
39k
Optimising Largest Contentful Paint
csswizardry
13
2.4k
Raft: Consensus for Rubyists
vanstee
133
6.3k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
358
22k
A Philosophy of Restraint
colly
197
16k
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
41
4.5k
Ruby is Unlike a Banana
tanoku
96
10k
A better future with KSS
kneath
231
16k
Put a Button on it: Removing Barriers to Going Fast.
kastner
58
3.1k
Teambox: Starting and Learning
jrom
128
8.4k
Designing for Performance
lara
601
67k
Transcript
Liquid Markup
Jon Daniel @binarycleric github.com/binarycleric
Obligatory Promotion We’re Hiring Smart People. Ruby experience NOT required.
What Is Liquid?
None
github.com/Shopify/liquid
lets clients design their own sites...
safely and securely
logic and variable manipulation
None
yay!
None
$ gem install liquid require 'liquid'
markup = "Hello, {{ thing }}!" t = Liquid::Template.parse(markup) t.render("thing"
=> "world")
Hello, world!
markup = "Welcome, {{ user.name }}" user = User.find(1337) t
= Liquid::Template.parse(markup) t.render('user' => user)
Welcome, !
Liquid Has Trust Issues
Deny By Default
class Person < ActiveRecord::Base end # denied! "{{ person.name }}"
=> "" class Person < ActiveRecord::Base liquid_methods :name end # okay! "{{ person.name }}" => "Cmdr Shepard"
markup = "Welcome, {{ user.name }}" user = User.find(1337) t
= Liquid::Template.parse(markup) t.render('user' => user)
Welcome, Jon ‘maddog’ Hall! * If you don’t know who
he is, check Wikipedia.
Live Free Or Die.
Actually Rendering Templates
# load the user from somewhere. t = Liquid::Template.parse(markup) t.render("user"
=> user)
t = Liquid::Template.parse(markup) context = Liquid::Context.new(*args) t.render(context)
The Magic Context
Liquid::Context.new local_assigns, global_assigns, registers
Liquid::Context.new local_assigns, global_assigns, registers
registers[:domain] = domain registers[:whatever] = whatever registers[:your] = your registers[:app]
= app registers[:needs] = needs registers[:file_system] = FileSystem.new
registers[:domain] = domain registers[:whatever] = whatever registers[:your] = your registers[:app]
= app registers[:needs] = needs registers[:file_system] = FileSystem.new
Some Liquid Syntax
class FileSystem def initialize(*args) # whatever end def read_template_file(name, context)
# fetches partials from wherever end end {% include 'some-partial' %}
# a block {% if liquid == 'awesome' %} You
should try Liquid! {% endif %} # a tag {% assign liquid = 'awesome' %}
class ExampleTag < Liquid::Tag def initialize(name, markup, tokens) # setup
the tag, parse stuff, ya know... # expensive stuff. end def render(context) # drop in the assigns and go! # should be cheap. end end
class ExampleTag < Liquid::Tag def initialize(name, markup, tokens) # setup
the tag, parse stuff, ya know... # expensive stuff. end def render(context) # drop in the assigns and go! # should be cheap. end end
class PersonDrop < Liquid::Drop def addresses # stupid slow operation
Address::find_by_person(@person) end end {{ user.addresses }}
{{ “hello world” | capitalize }} # shamelessly stolen from
# liquid's source. use your # imagination people! def capitalize(input) input.to_s.capitalize end
Liquid Philosophies
•assume hostile environment •white list what you need •deny everything
else
•can edit markup •is probably non-technical Assume the client
•ignore errors by default •don’t let the client break too
much
It May Not Be For You
•partial branding •full white-label •per-install customization
Views As Data
Contribute!
Questions?