Class: ViewScope

Inherits:
Object show all
Includes:
AttributeScope
Defined in:
lib/volt/server/html_parser/view_scope.rb

Direct Known Subclasses

EachScope, IfViewScope, TextareaScope

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from AttributeScope

#add_id_to_attributes, #add_multiple_attribute, #add_single_attribute, #add_string_template_renderer, #attribute_string, #getter_to_setter, #process_attribute, #process_attributes, #process_event_binding

Constructor Details

#initialize(handler, path) ⇒ ViewScope

Returns a new instance of ViewScope.



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# File 'lib/volt/server/html_parser/view_scope.rb', line 9

def initialize(handler, path)
  @handler = handler
  @path = path

  @html = ''
  @bindings = {}
  @binding_number = 0
end

Instance Attribute Details

#binding_number ⇒ Object

Returns the value of attribute binding_number.



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# File 'lib/volt/server/html_parser/view_scope.rb', line 7

def binding_number
  @binding_number
end

#bindings ⇒ Object (readonly)

Returns the value of attribute bindings.



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# File 'lib/volt/server/html_parser/view_scope.rb', line 6

def bindings
  @bindings
end

#html ⇒ Object (readonly)

Returns the value of attribute html.



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# File 'lib/volt/server/html_parser/view_scope.rb', line 6

def html
  @html
end

#path ⇒ Object

Returns the value of attribute path.



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# File 'lib/volt/server/html_parser/view_scope.rb', line 7

def path
  @path
end

Instance Method Details

#<<(html) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 18

def <<(html)
  @html << html
end

#add_binding(content) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 22

def add_binding(content)
  case content[0]
  when '#'
		command, *content = content.split(/ /)
		content = content.join(' ')

    case command
    when '#if'
      add_if(content)
    when '#elsif'
      add_else(content)
    when '#else'
      if content.blank?
        add_else(nil)
      else
        raise "#else does not take a conditional #{content} was provided."
      end
    when '#each'
      add_each(content)
    when '#template'
      add_template(content)
    end
  when '/'
    # close binding
    close_scope
  else
    # content
    add_content_binding(content)
  end
end

#add_component(tag_name, attributes, unary) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 96

def add_component(tag_name, attributes, unary)
  component_name = tag_name[1..-1].gsub(':', '/')

  @handler.html << "<!-- $#{@binding_number} --><!-- $/#{@binding_number} -->"

  data_hash = []
  attributes.each_pair do |name, value|
    parts = value.split(/(\{[^\}]+\})/).reject(&:blank?)
    binding_count = parts.count {|p| p[0] == '{' && p[-1] == '}'}

    # if this attribute has bindings
    if binding_count > 0
      if binding_count > 1
        # Multiple bindings
      elsif parts.size == 1 && binding_count == 1
        # A single binding
        getter = value[1..-2]
        data_hash << "#{name.inspect} => Proc.new { #{getter} }"

        setter = getter_to_setter(getter)
        data_hash << "#{(name + "=").inspect} => Proc.new { |val| #{setter} }"

        # Add an _parent fetcher.  Useful for things like volt-fields to get the parent model.
        parent = parent_fetcher(getter)

        # TODO: This adds some overhead, perhaps there is a way to compute this dynamically on the
        # front-end.
        data_hash << "#{(name + "_parent").inspect} => Proc.new { #{parent} }"

        # Add a _last_method property.  This is useful
        data_hash << "#{(name + "_last_method").inspect} => #{last_method_name(getter).inspect}"
      end
    else
      # String
      data_hash << "#{name.inspect} => #{value.inspect}"
    end
  end

  arguments = "#{component_name.inspect}, { #{data_hash.join(',')} }"

  save_binding(@binding_number, "lambda { |__p, __t, __c, __id| ComponentBinding.new(__p, __t, __c, __id, #{@path.inspect}, Proc.new { [#{arguments}] }) }")

  @binding_number += 1
end

#add_content_binding(content) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 53

def add_content_binding(content)
  @handler.html << "<!-- $#{@binding_number} --><!-- $/#{@binding_number} -->"
  save_binding(@binding_number, "lambda { |__p, __t, __c, __id| ContentBinding.new(__p, __t, __c, __id, Proc.new { #{content} }) }")
  @binding_number += 1
end

#add_each(content) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 69

def add_each(content)
  @handler.scope << EachScope.new(@handler, @path + "/__each#{@binding_number}", content)
end

#add_else(content) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 65

def add_else(content)
  raise "#else can only be added inside of an if block"
end

#add_if(content) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 59

def add_if(content)
  # Add with path for if group.
  @handler.scope << IfViewScope.new(@handler, @path + "/__ifg#{@binding_number}", content)
  @binding_number += 1
end

#add_template(content) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 73

def add_template(content)
  @handler.html << "<!-- $#{@binding_number} --><!-- $/#{@binding_number} -->"
  save_binding(@binding_number, "lambda { |__p, __t, __c, __id| TemplateBinding.new(__p, __t, __c, __id, #{@path.inspect}, Proc.new { [#{content}] }) }")

  @binding_number += 1
end

#add_textarea(tag_name, attributes, unary) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 141

def add_textarea(tag_name, attributes, unary)
  @handler.scope << TextareaScope.new(@handler, @path + "/__txtarea#{@binding_number}", attributes)
  @binding_number += 1

  # close right away if unary
  @handler.last.close_scope if unary
end

#close_scope(pop = true) ⇒ Object

Called when this scope should be closed out



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# File 'lib/volt/server/html_parser/view_scope.rb', line 150

def close_scope(pop=true)
  if pop
    scope = @handler.scope.pop
  else
    scope = @handler.last
  end

  raise "template path already exists: #{scope.path}" if @handler.templates[scope.path]

  template = {
    'html' => scope.html
  }

  if scope.bindings.size > 0
    # Add the bindings if there are any
    template['bindings'] = scope.bindings
  end

  @handler.templates[scope.path] = template
end

#last_method_name(getter) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 92

def last_method_name(getter)
  return getter.strip[/[^.]+$/]
end

#parent_fetcher(getter) ⇒ Object

Returns ruby code to fetch the parent. (by removing the last fetch) TODO: Probably want to do this with AST transforms with the parser/unparser gems



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# File 'lib/volt/server/html_parser/view_scope.rb', line 82

def parent_fetcher(getter)
  parent = getter.strip.gsub(/[.][^.]+$/, '')

  if parent.blank? || !getter.index('.')
    parent = 'self'
  end

  return parent
end

#save_binding(binding_number, code) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 171

def save_binding(binding_number, code)
  @bindings[binding_number] ||= []
  @bindings[binding_number] << code
end