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Jon Daniel
October 04, 2012
Programming
1
190
Liquid Markup
Talk I gave October 4, 2012 at Pittsburgh Ruby Brigade.
Jon Daniel
October 04, 2012
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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?