Class: ExpressTemplates::Expander

Inherits:
Object
  • Object
show all
Defined in:
lib/express_templates/expander.rb

Direct Known Subclasses

Components::Base

Defined Under Namespace

Classes: Stack

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Expander

Returns a new instance of Expander.



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# File 'lib/express_templates/expander.rb', line 9

def initialize(*args)
  initialize_expander(*args)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &block) ⇒ Object 



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# File 'lib/express_templates/expander.rb', line 78

def method_missing(name, *args, &block)
  return locals[name] if locals.keys.include?(name)

  if handlers.keys.include?(name)
    stack << handlers[name].send(name, *args, &block)
  else
    stack << ExpressTemplates::Markup::Wrapper.new(name.to_s, *args, &block)
  end
  nil
end

Instance Attribute Details

#handlers ⇒ Object

Returns the value of attribute handlers.



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# File 'lib/express_templates/expander.rb', line 7

def handlers
  @handlers
end

#locals ⇒ Object

Returns the value of attribute locals.



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# File 'lib/express_templates/expander.rb', line 7

def locals
  @locals
end

#stack ⇒ Object

Returns the value of attribute stack.



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# File 'lib/express_templates/expander.rb', line 7

def stack
  @stack
end

Class Method Details

.register_macros_for(*components) ⇒ Object

define a “macro” method for a component these methods accept args which are passed to the initializer for the component blocks supplied are evaluated and children added to the “stack” are added as children to the component



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# File 'lib/express_templates/expander.rb', line 52

def self.register_macros_for(*components)
  components.each do |component|
    define_method(component.macro_name.to_sym) do |*args, &block|
        new_component = nil
        # this is a code smell here.
        if component.ancestors.include?(Components::Capabilities::Building)
          new_component = component.new(*(args.push(self)), &block)
        else
          new_component = component.new(*(args.push(self)))
          process_children!(new_component, &block) unless block.nil?
        end
        stack << new_component
    end
  end
end

Instance Method Details

#expand(source = nil, &block) ⇒ Object 



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# File 'lib/express_templates/expander.rb', line 21

def expand(source=nil, &block)
  case
  when block.nil? && source
    modified = _wrap_instance_vars( _replace_yield_with_yielder(source) )
    instance_eval(modified, @template.inspect)
  when block
    instance_exec &block
  else
    raise ArgumentError
  end
  stack.current
end

#initialize_expander(template, handlers = {}, locals = {}) ⇒ Object 



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# File 'lib/express_templates/expander.rb', line 13

def initialize_expander(template, handlers = {}, locals = {})
  @template = template
  @stack = Stack.new
  @handlers = handlers
  @locals = locals
  self
end

#process_children!(parent, &block) ⇒ Object 



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# File 'lib/express_templates/expander.rb', line 34

def process_children!(parent, &block)
  begin
    stack.descend!
    result = instance_exec &block
    if stack.current.empty? && result.is_a?(String)
      stack << result
    end
    parent.children += stack.current
    stack.ascend!
  end
  stack.current
end