Class: RablRails::Compiler

Inherits:
Object
  • Object
show all
Defined in:
lib/rabl-rails/compiler.rb

Overview

Class that will compile RABL source code into a hash representing data structure

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Compiler

Returns a new instance of Compiler.



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# File 'lib/rabl-rails/compiler.rb', line 7

def initialize
  @i = 0
end

Instance Method Details

#attribute(*args) ⇒ Object Also known as: attributes

Includes the attribute or method in the output Example:

attributes :id, :name
attribute :email => :super_secret



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# File 'lib/rabl-rails/compiler.rb', line 43

def attribute(*args)
  if args.first.is_a?(Hash)
    args.first.each_pair { |k, v| @template[v] = k }
  else
    options = args.extract_options!
    args.each { |name|
      key = options[:as] || name
      @template[key] = name
    }
  end
end

#child(name_or_data, options = {}) ⇒ Object

Creates a child node to be included in the output. name_or data can be an object or collection or a method to call on the data. It accepts :root and :partial options. Notes that partial and blocks are not compatible Example:

child(:@posts, :root => :posts) { attribute :id }
child(:posts, :partial => 'posts/base')



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# File 'lib/rabl-rails/compiler.rb', line 65

def child(name_or_data, options = {})
  data, name = extract_data_and_name(name_or_data)
  name = options[:root] if options.has_key? :root
  if options[:partial]
    template = Library.instance.compile_template_from_path(options[:partial])
    @template[name] = template.merge!(:_data => data)
  elsif block_given?
    @template[name] = sub_compile(data) { yield }
  end
end

#compile_source(source) ⇒ Object

Compile from source code and return the CompiledTemplate created.



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# File 'lib/rabl-rails/compiler.rb', line 15

def compile_source(source)
  @template = CompiledTemplate.new
  instance_eval(source)
  @template
end

#condition(proc) ⇒ Object

Provide a conditionnal block

condition(->(u) { u.is_a?(Admin) }) do

attributes :secret

end



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# File 'lib/rabl-rails/compiler.rb', line 128

def condition(proc)
  return unless block_given?
  name = :"_if#{@i}"
  @i += 1
  @template[name] = Condition.new(proc, sub_compile(nil) { yield })
end

#extends(path) ⇒ Object

Extends an existing rabl template Example:

extends 'users/base'



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# File 'lib/rabl-rails/compiler.rb', line 116

def extends(path)
  t = Library.instance.compile_template_from_path(path)
  @template.merge!(t.source)
end

#glue(data) ⇒ Object

Glues data from a child node to the output Example:

glue(:@user) { attribute :name }



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# File 'lib/rabl-rails/compiler.rb', line 81

def glue(data)
  return unless block_given?
  name = :"_glue#{@i}"
  @i += 1
  @template[name] = sub_compile(data) { yield }
end

#node(name, options = {}, &block) ⇒ Object Also known as: code

Creates an arbitrary node in the json output. It accepts :if option to create conditionnal nodes. The current data will be passed to the block so it is advised to use it instead of ivars. Example:

node(:name) { |user| user.first_name + user.last_name }
node(:role, if: ->(u) { !u.admin? }) { |u| u.role }



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# File 'lib/rabl-rails/compiler.rb', line 96

def node(name, options = {}, &block)
  condition = options[:if]

  if condition
    if condition.is_a?(Proc)
      @template[name] = [condition, block]
    else
      @template[name] = block if condition
    end
  else
    @template[name] = block
  end
end

#object(data, options = {}) ⇒ Object Also known as: collection

Sets the object to be used as the data for the template Example:

object :@user
object :@user, :root => :author



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# File 'lib/rabl-rails/compiler.rb', line 27

def object(data, options = {})
  @template.data, @template.root_name = extract_data_and_name(data)
  @template.root_name = options[:root] if options.has_key? :root
end

#root(name) ⇒ Object 



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# File 'lib/rabl-rails/compiler.rb', line 33

def root(name)
  @template.root_name = name
end