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')

Defined Under Namespace

Classes: TagRegistry

Constant Summary collapse

DEFAULT_OPTIONS = 
{
  :locale => I18n.new
}
@@file_system = 
BlankFileSystem.new

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Template

Returns a new instance of Template.



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# File 'lib/liquid/template.rb', line 112

def initialize
  @resource_limits = self.class.default_resource_limits.dup
end

Class Attribute Details

.error_mode ⇒ Object 



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# File 'lib/liquid/template.rb', line 85

def error_mode
  @error_mode || :lax
end

.taint_mode ⇒ Object 



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# File 'lib/liquid/template.rb', line 89

def taint_mode
  @taint_mode || :lax
end

Instance Attribute Details

#profiler ⇒ Object (readonly)

Returns the value of attribute profiler.



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# File 'lib/liquid/template.rb', line 54

def profiler
  @profiler
end

#resource_limits ⇒ Object

Returns the value of attribute resource_limits.



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

def resource_limits
  @resource_limits
end

#root ⇒ Object

Returns the value of attribute root.



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

def root
  @root
end

Class Method Details

.default_resource_limits ⇒ Object 



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# File 'lib/liquid/template.rb', line 99

def default_resource_limits
  @default_resource_limits ||= {}
end

.file_system ⇒ Object 



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# File 'lib/liquid/template.rb', line 69

def file_system
  @@file_system
end

.file_system=(obj) ⇒ Object 



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# File 'lib/liquid/template.rb', line 73

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

.parse(source, options = {}) ⇒ Object

creates a new Template object from liquid source code To enable profiling, pass in profile: true as an option. See Liquid::Profiler for more information



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# File 'lib/liquid/template.rb', line 106

def parse(source, options = {})
  template = Template.new
  template.parse(source, options)
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 95

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

.register_tag(name, klass) ⇒ Object 



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# File 'lib/liquid/template.rb', line 77

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

.tags ⇒ Object 



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# File 'lib/liquid/template.rb', line 81

def tags
  @tags ||= TagRegistry.new
end

Instance Method Details

#assigns ⇒ Object 



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# File 'lib/liquid/template.rb', line 136

def assigns
  @assigns ||= {}
end

#errors ⇒ Object 



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# File 'lib/liquid/template.rb', line 144

def errors
  @errors ||= []
end

#instance_assigns ⇒ Object 



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

def instance_assigns
  @instance_assigns ||= {}
end

#parse(source, options = {}) ⇒ Object

Parse source code. Returns self for easy chaining



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# File 'lib/liquid/template.rb', line 118

def parse(source, options = {})
  @options = options
  @profiling = options[:profile]
  @line_numbers = options[:line_numbers] || @profiling
  @root = Document.parse(tokenize(source), DEFAULT_OPTIONS.merge(options))
  @warnings = nil
  self
end

#registers ⇒ Object 



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

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

if profiling was enabled in Template#parse then the resulting profiling information will be available via Template#profiler

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 162

def render(*args)
  return ''.freeze if @root.nil?

  context = case args.first
  when Liquid::Context
    c = args.shift

    if @rethrow_errors
      c.exception_handler = ->(e) { true }
    end

    c
  when Liquid::Drop
    drop = args.shift
    drop.context = Context.new([drop, assigns], instance_assigns, registers, @rethrow_errors, @resource_limits)
  when Hash
    Context.new([args.shift, assigns], instance_assigns, registers, @rethrow_errors, @resource_limits)
  when nil
    Context.new(assigns, instance_assigns, registers, @rethrow_errors, @resource_limits)
  else
    raise ArgumentError, "Expected 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

    if options[:exception_handler]
      context.exception_handler = options[:exception_handler]
    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 an array back here. join will make a string out of it.
    result = with_profiling do
      @root.render(context)
    end
    result.respond_to?(:join) ? result.join : result
  rescue Liquid::MemoryError => e
    context.handle_error(e)
  ensure
    @errors = context.errors
  end
end

#render!(*args) ⇒ Object 



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# File 'lib/liquid/template.rb', line 220

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

#warnings ⇒ Object 



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# File 'lib/liquid/template.rb', line 127

def warnings
  return [] unless @root
  @warnings ||= @root.warnings
end