Class: Liquid::Template

Inherits:
Object
  • Object
show all
Defined in:
lib/liquid/template.rb

Overview

Templates are central to liquid. Interpretating templates is a two step process. First you compile the source code you got. During compile time some extensive error checking is performed. your code should expect to get some SyntaxErrors.

After you have a compiled template you can then render it. You can use a compiled template over and over again and keep it cached.

Example: 

template = Liquid::Template.parse(source)
template.render('user_name' => 'bob')

Constant Summary collapse

@@file_system = 
BlankFileSystem.new

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tokens = []) ⇒ Template

creates a new Template from an array of tokens. Use Template.parse instead



59
60
61
 
# File 'lib/liquid/template.rb', line 59

def initialize(tokens = [])
  @root = Document.new(tokens)
end

Instance Attribute Details

#root ⇒ Object

Returns the value of attribute root.



17
18
19
 
# File 'lib/liquid/template.rb', line 17

def root
  @root
end

Class Method Details

.file_system ⇒ Object 



20
21
22
 
# File 'lib/liquid/template.rb', line 20

def self.file_system
  @@file_system
end

.file_system=(obj) ⇒ Object 



24
25
26
 
# File 'lib/liquid/template.rb', line 24

def self.file_system=(obj)
  @@file_system = obj
end

.parse(source) ⇒ Object

creates a new Template object from liquid source code



43
44
45
 
# File 'lib/liquid/template.rb', line 43

def self.parse(source)
  self.new(tokenize(source))
end

.register_filter(mod) ⇒ Object

Pass a module with filter methods which should be available to all liquid views. Good for registering the standard library



38
39
40
 
# File 'lib/liquid/template.rb', line 38

def self.register_filter(mod)      
  Strainer.global_filter(mod)
end

.register_tag(name, klass) ⇒ Object 



28
29
30
 
# File 'lib/liquid/template.rb', line 28

def self.register_tag(name, klass)      
  tags[name.to_s] = klass
end

.tags ⇒ Object 



32
33
34
 
# File 'lib/liquid/template.rb', line 32

def self.tags
  @tags ||= {}
end

.tokenize(source) ⇒ Object

Uses the Liquid::TokenizationRegexp regexp to tokenize the passed source



48
49
50
51
52
53
54
55
56
 
# File 'lib/liquid/template.rb', line 48

def self.tokenize(source)      
  return [] if source.to_s.empty?
  tokens = source.split(TokenizationRegexp)

  # removes the rogue empty element at the beginning of the array
  tokens.shift if tokens[0] and tokens[0].empty? 

  tokens
end

Instance Method Details

#render(assigns = {}, options = nil) ⇒ Object

Render takes a hash with local variables.

if you use the same filters over and over again consider registering them globally with Template.register_filter

Following options can be passed:

* <tt>filters</tt> : array with local filters
* <tt>registers</tt> : hash with register variables. Those can be accessed from 
  filters and tags and might be useful to integrate liquid more with its host application



74
75
76
77
78
79
80
81
82
83
84
85
86
 
# File 'lib/liquid/template.rb', line 74

def render(assigns = {}, options = nil)
  options = { :filters => options } unless options.is_a?(Hash)
  context = Context.new(assigns, options[:registers])
  
  # Apply all filters 
  [options[:filters]].flatten.each do |filter|         
    context.add_filters(filter) 
  end
        
  # render the nodelist.
  # for performance reasons we get a array back here. to_s will make a string out of it
  @root.render(context).to_s
end