Class: Volt::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, #binding_parts_and_count, #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 10

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 8

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 7

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 7

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 8

def path
  @path
end

Instance Method Details

#<<(html) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 19

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

#add_binding(content) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 23

def add_binding(content)
  content = content.strip
  index   = content.index(/[ \(]/)
  if index
    first_symbol = content[0...index]
    args         = content[index..-1].strip

    case first_symbol
      when 'if'
        add_if(args)
      when 'elsif'
        add_else(args)
      when 'else'
        if args.blank?
          add_else(nil)
        else
          fail "else does not take a conditional, #{content} was provided."
        end
      when 'template'
        add_template(args)
      else
        if content =~ /.each\s+do\s+\|/
          add_each(content)
        else
          add_content_binding(content)
        end
    end
  else
    case content
      when 'end'
        # Close the binding
        close_scope
      when 'else'
        add_else(nil)
      else
        add_content_binding(content)
    end
  end
end

#add_component(tag_name, attributes, unary) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 109

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

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

  data_hash = []
  attributes.each_pair do |name, value|
    name = name.tr('-', '_')
    parts, binding_count = binding_parts_and_count(value)

    # 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[2...-2].strip
        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| Volt::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 63

def add_content_binding(content)
  @handler.html << "<!-- $#{@binding_number} --><!-- $/#{@binding_number} -->"
  save_binding(@binding_number, "lambda { |__p, __t, __c, __id| Volt::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 79

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 75

def add_else(content)
  fail '#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 69

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 83

def add_template(content)
  # Strip ( and ) from the outsides
  content = content.strip.gsub(/^\(/, '').gsub(/\)$/, '')

  @handler.html << "<!-- $#{@binding_number} --><!-- $/#{@binding_number} -->"
  save_binding(@binding_number, "lambda { |__p, __t, __c, __id| Volt::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 154

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 163

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

  fail "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 105

def last_method_name(getter)
  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 95

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

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

  parent
end

#save_binding(binding_number, code) ⇒ Object 



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# File 'lib/volt/server/html_parser/view_scope.rb', line 184

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