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 ⇒ Template

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



52
53
 
# File 'lib/liquid/template.rb', line 52

def initialize
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 



21
22
23
 
# File 'lib/liquid/template.rb', line 21

def file_system
  @@file_system
end

.file_system=(obj) ⇒ Object 



25
26
27
 
# File 'lib/liquid/template.rb', line 25

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

.parse(source) ⇒ Object

creates a new Template object from liquid source code



44
45
46
47
48
 
# File 'lib/liquid/template.rb', line 44

def parse(source)
  template = Template.new
  template.parse(source)
  template
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



39
40
41
 
# File 'lib/liquid/template.rb', line 39

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

.register_tag(name, klass) ⇒ Object 



29
30
31
 
# File 'lib/liquid/template.rb', line 29

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

.tags ⇒ Object 



33
34
35
 
# File 'lib/liquid/template.rb', line 33

def tags
  @tags ||= {}
end

Instance Method Details

#assigns ⇒ Object 



66
67
68
 
# File 'lib/liquid/template.rb', line 66

def assigns
  @assigns ||= {}
end

#errors ⇒ Object 



74
75
76
 
# File 'lib/liquid/template.rb', line 74

def errors
  @errors ||= []
end

#instance_assigns ⇒ Object 



70
71
72
 
# File 'lib/liquid/template.rb', line 70

def instance_assigns
  @instance_assigns ||= {}
end

#parse(source) ⇒ Object

Parse source code. Returns self for easy chaining



57
58
59
60
 
# File 'lib/liquid/template.rb', line 57

def parse(source)
  @root = Document.new(tokenize(source))
  self
end

#registers ⇒ Object 



62
63
64
 
# File 'lib/liquid/template.rb', line 62

def registers
  @registers ||= {}
end

#render(*args) ⇒ 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



89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
 
# File 'lib/liquid/template.rb', line 89

def render(*args)
  return '' if @root.nil?
  
  context = case args.first
  when Liquid::Context
    args.shift
  when Hash
    Context.new([args.shift, assigns], instance_assigns, registers, @rethrow_errors)
  when nil
    Context.new(assigns, instance_assigns, registers, @rethrow_errors)
  else
    raise ArgumentError, "Expect Hash or Liquid::Context as parameter"
  end

  case args.last
  when Hash
    options = args.pop

    if options[:registers].is_a?(Hash)
      self.registers.merge!(options[:registers])
    end

    if options[:filters]
      context.add_filters(options[:filters])
    end

  when Module
    context.add_filters(args.pop)
  when Array
    context.add_filters(args.pop)
  end

  begin
    # render the nodelist.
    # for performance reasons we get a array back here. join will make a string out of it
    result = @root.render(context)
    result.respond_to?(:join) ? result.join : result
  ensure
    @errors = context.errors
  end
end

#render!(*args) ⇒ Object 



131
132
133
 
# File 'lib/liquid/template.rb', line 131

def render!(*args)
  @rethrow_errors = true; render(*args)
end