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



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

def initialize
end

Instance Attribute Details

#root ⇒ Object

Returns the value of attribute root.



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

def root
  @root
end

Class Method Details

.file_system ⇒ Object 



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

def file_system
  @@file_system
end

.file_system=(obj) ⇒ Object 



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

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

.parse(source, context = {}) ⇒ Object

creates a new Template object from liquid source code



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

def parse(source, context = {})
  template = Template.new
  template.parse(source, context)
  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



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

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

.register_tag(name, klass) ⇒ Object 



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

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

.tags ⇒ Object 



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

def tags
  @tags ||= {}
end

Instance Method Details

#_walk(list, memo = {}, &block) ⇒ Object 



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# File 'lib/liquid/template.rb', line 140

def _walk(list, memo = {}, &block)
  list.each do |node|
    saved_memo = memo.clone

    # puts "fetch ! #{node.respond_to?(:name) ? node.name : 'String'} / #{node.respond_to?(:nodelist)}"
    if block_given?
      # puts "youpi ! #{node.name}"
      _memo = yield(node, memo) || {}
      memo.merge!(_memo)
    end

    if node.respond_to?(:nodelist) && !node.nodelist.blank?
      self._walk(node.nodelist, memo, &block)
    end

    memo = saved_memo
  end
  memo
end

#assigns ⇒ Object 



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

def assigns
  @assigns ||= {}
end

#errors ⇒ Object 



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

def errors
  @errors ||= []
end

#instance_assigns ⇒ Object 



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

def instance_assigns
  @instance_assigns ||= {}
end

#parse(source, context = {}) ⇒ Object

Parse source code. Returns self for easy chaining



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

def parse(source, context = {})
  @root = Document.new(tokenize(source), context.merge!(:template => self))
  self
end

#registers ⇒ Object 



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# 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



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# 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 



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

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

#walk(memo = {}, &block) ⇒ Object 



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# File 'lib/liquid/template.rb', line 135

def walk(memo = {}, &block)
  # puts @root.nodelist.inspect
  self._walk(@root.nodelist, memo, &block)
end