Class: Dryml::TemplateEnvironment

Inherits:
Object
  • Object
show all
Includes:
Helper
Defined in:
lib/dryml/template_environment.rb

Class Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Helper

#context_map, #create_part_id, #first_item?, #last_item?, #param_name_for, #param_name_for_this, #param_name_for_this_parent

Constructor Details

#initialize(view = nil) ⇒ TemplateEnvironment

Returns a new instance of TemplateEnvironment.



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# File 'lib/dryml/template_environment.rb', line 28

def initialize(view=nil)
  unless view.nil?
    @view = view
    @_erb_binding = binding
    @_part_contexts = {}
    @_scoped_variables = ScopedVariables.new
    @_polymorphic_tag_cache = {}

    # Make sure the "assigns" from the controller are available (instance variables)
    if view
      view.assigns.each do |key, value|
        instance_variable_set("@#{key}", value)
      end

      # copy view instance variables over
      view.instance_variables.each do |iv|
        instance_variable_set(iv, view.instance_variable_get(iv))
      end
    end
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

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



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# File 'lib/dryml/template_environment.rb', line 640

def method_missing(name, *args, &b)
  if @view
    @view.send(name, *args, &b)
  else
    raise NoMethodError, name.to_s
  end
end

Class Attribute Details

.compiled_local_names ⇒ Object

Returns the value of attribute compiled_local_names.



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# File 'lib/dryml/template_environment.rb', line 9

def compiled_local_names
  @compiled_local_names
end

.load_time ⇒ Object

Returns the value of attribute load_time.



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# File 'lib/dryml/template_environment.rb', line 9

def load_time
  @load_time
end

Class Method Details

._register_tag_attrs(tag_name, attrs) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 12

def _register_tag_attrs(tag_name, attrs)
  @tag_attrs ||= {}
  @tag_attrs[tag_name] = attrs
end

.inherited(subclass) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 6

def inherited(subclass)
  subclass.compiled_local_names = []
end

.tag_attrs ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 18

def tag_attrs
  @tag_attrs ||= {}
end

Instance Method Details

#_tag_context(attributes) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 375

def _tag_context(attributes)
  with  = attributes[:with]
  field = attributes[:field]

  if with && field
    new_object_context(with) { new_field_context(field) { yield } }
  elsif field
    new_field_context(field) { yield }
  elsif attributes.has_key?(:with)
    new_object_context(with) { yield }
  else
    new_context { yield }
  end
end

#_tag_locals(attributes, locals) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 409

def _tag_locals(attributes, locals)
  attributes = attributes.symbolize_keys
  #ensure with and field are not in attributes
  attributes.delete(:with)
  attributes.delete(:field)

  # declared attributes don't appear in the attributes hash
  stripped_attributes = HashWithIndifferentAccess.new.update(attributes)
  locals.each {|a| stripped_attributes.delete(a.to_sym) }

  # Return locals declared as local variables (attrs="...")
  locals.map {|a| attributes[a.to_sym]} + [stripped_attributes]
end

#add_classes(attributes, *classes) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 118

def add_classes(attributes, *classes)
  add_classes!(HashWithIndifferentAccess.new(attributes), classes)
end

#add_classes!(attributes, *classes) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 111

def add_classes!(attributes, *classes)
  classes = classes.flatten.select{|x|x}
  current = attributes[:class]
  attributes[:class] = (current ? current.split + classes : classes).uniq.join(' ')
  attributes
end

#add_data_rapid(attrs, tag, options) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 135

def add_data_rapid(attrs, tag, options)
  add_data_rapid!(HashWithIndifferentAccess.new(attrs), tag, options)
end

#add_data_rapid!(attrs, tag, options) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 129

def add_data_rapid!(attrs, tag, options)
  data_rapid = ActiveSupport::JSON.decode(attrs["data_rapid"] || "{}")
  attrs["data_rapid"] = data_rapid.update(tag => options).to_json
  attrs
end

#attrs_for(name) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 102

def attrs_for(name)
  self.class.tag_attrs[name.to_sym]
end

#call_part(part_node_id, part_name, *locals) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 179

def call_part(part_node_id, part_name, *locals)
  res = ''
  new_context do
    @_part_contexts[part_node_id] = PartContext.for_call(part_name, self, locals)
    res = send("#{part_name}_part", *locals)
  end
  res
end

#call_polymorphic_tag(name, *args) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 231

def call_polymorphic_tag(name, *args)
  name = name.to_s.gsub('-', '_')
  type = args.first.is_a?(Class) ? args.shift : nil
  attributes, parameters = args

  tag = find_polymorphic_tag(name, type)
  if tag != name
    send(tag, attributes || {}, parameters || {})
  else
    block_given? ? yield : nil
  end
end

#call_tag_parameter(the_tag, attributes, parameters, caller_parameters, param_name) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 445

def call_tag_parameter(the_tag, attributes, parameters, caller_parameters, param_name)
  overriding_proc = caller_parameters[param_name]
  replacing_proc  = caller_parameters[:"#{param_name}_replacement"]

  unless param_name == the_tag || param_name == :default
    classes = attributes[:class]
    param_class = param_name.to_s.gsub('_', '-')
    attributes[:class] = if classes
                           classes =~ /\b#{param_class}\b/ ? classes : "#{classes} #{param_class}"
                         else
                           param_class
                         end
  end

  if param_name == :default && overriding_proc && overriding_proc.arity>0
    # :default content is handled specially

    call_tag_parameter_with_default_content(the_tag, attributes, parameters[:default], overriding_proc)

  elsif replacing_proc
    # The caller is replacing this parameter. Don't call the tag
    # at all, just the overriding proc, but pass the restorable
    # tag as a parameter to the overriding proc

    tag_restore = proc do |restore_attrs, restore_params|
      # Call the replaced tag with the attributes and parameters
      # as given in the original tag definition, and with the
      # specialisation given on the 'restore' call

      if overriding_proc
        overriding_attributes, overriding_parameters = overriding_proc.call
        restore_attrs  = overriding_attributes.merge(restore_attrs)
        restore_params = overriding_parameters.merge(restore_params)
      end

      override_and_call_tag(the_tag, attributes, parameters, restore_attrs, restore_params)
    end
    replacing_proc.call(tag_restore)

  else
    overriding_attributes, overriding_parameters = overriding_proc._?.call
    override_and_call_tag(the_tag, attributes, parameters, overriding_attributes, overriding_parameters)
  end
end

#call_tag_parameter_with_default_content(the_tag, attributes, default_content, overriding_content_proc) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 424

def call_tag_parameter_with_default_content(the_tag, attributes, default_content, overriding_content_proc)
  if the_tag.is_one_of?(String, Symbol) && the_tag.to_s.in?(Dryml.static_tags)
    body = if overriding_content_proc
             new_context { overriding_content_proc.call(proc { default_content._?.call(nil) }) }
           elsif default_content
             new_context { default_content.call(nil) }
           else
             nil
           end
    element(the_tag, attributes, body)
  else
    d = if overriding_content_proc
          proc { |default| overriding_content_proc.call(proc { default_content._?.call(default) }) }
        else
          proc { |default| default_content._?.call(default) }
        end
    send(the_tag, attributes, { :default => d })
  end
end

#deunderscore_attributes(attrs) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 107

def deunderscore_attributes(attrs)
  HashWithIndifferentAccess[attrs.map{ |attr, value| [attr.to_s.gsub('_', '-'), value]}]
end

#element(name, attributes, content = nil, escape = true, empty = false, &block) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 601

def element(name, attributes, content=nil, escape = true, empty = false, &block)
  unless attributes.blank?
    attrs = []
    if escape
      attributes.each do |key, value|
        next unless value
        key = key.to_s.gsub("_", "-")

        value = if ActionView::Helpers::TagHelper::BOOLEAN_ATTRIBUTES.include?(key)
                  key
                else
                  # escape once
                  value.to_s.gsub(/[\"><]|&(?!([a-zA-Z]+|(#\d+));)/) { |special| ERB::Util::HTML_ESCAPE[special] }
                end
        attrs << %(#{key}="#{value}")
      end

    else
      attrs = options.map do |key, value|
        key = key.to_s.gsub("_", "-")
        %(#{key}="#{value}")
      end
    end
    attr_string = " #{attrs.sort * ' '}" unless attrs.empty?
  end
  content = capture { new_context &block } if block_given?
  if empty
    "<#{name}#{attr_string}#{scope.xmldoctype ? ' /' : ''}>".html_safe
  else
    "<#{name}#{attr_string}>".html_safe + content + "</#{name}>".html_safe
  end
end

#find_form_field_path(object) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 355

def find_form_field_path(object)
  back = []
  while object
    path = @_form_field_paths_by_object[object]
    if path
      path = path + back unless back.empty?
      return path
    end
    if object.respond_to? :origin
      back.unshift object.origin_attribute
      object = object.origin
    else
      return nil
    end
  end
end

#find_polymorphic_tag(name, call_type = nil) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 245

def find_polymorphic_tag(name, call_type=nil)
  call_type ||= (this.respond_to?(:member_class) && this.member_class) || this_type
  begin
    found = nil
    while true
      # ActiveSupport::TimeWithZone.name would return 'Time'
      # so we add an exception to pick the right datetime type
      type_name = ( call_type == ActiveSupport::TimeWithZone ? 'datetime' : call_type.name.to_s).underscore.gsub('/', '__')
      if respond_to?(poly_name = "#{name}__for_#{type_name}")
        found = poly_name
        break
      else
        if call_type == Object
          found = name
          break
        else
          call_type = call_type.superclass
        end
      end
    end
    found
  end
end

#merge_attrs(attrs, overriding_attrs) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 139

def merge_attrs(attrs, overriding_attrs)
  attrs = {}.update(attrs)
  return attrs if overriding_attrs.nil?
  attrs = attrs.with_indifferent_access unless attrs.is_a?(HashWithIndifferentAccess)
  classes = overriding_attrs[:class]
  add_classes!(attrs, *classes.split) if classes
  remove_classes!(attrs, *(overriding_attrs[:remove_class].split)) if overriding_attrs[:remove_class]
  if (data_rapid = overriding_attrs["data_rapid"])
    attrs["data_rapid"]=ActiveSupport::JSON.decode(attrs["data_rapid"] || "{}").
      update(ActiveSupport::JSON.decode(data_rapid)).to_json
  end

  attrs.update(overriding_attrs - [:class, :data_rapid])
end

#merge_parameter_hashes(given_parameters, overriding_parameters) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 575

def merge_parameter_hashes(given_parameters, overriding_parameters)
  to_merge = given_parameters.keys & overriding_parameters.keys
  no_merge = overriding_parameters.keys - to_merge
  result = given_parameters.dup

  no_merge.each { |k| result[k] = overriding_parameters[k] }
  to_merge.each { |k| result[k] = merge_tag_parameter(given_parameters[k], overriding_parameters[k])}

  result
end

#merge_tag_parameter(general_proc, overriding_proc) ⇒ Object

This method is used where ‘param’ is declared on a tag that is itself a parameter tag. Takes two procs that each return a pair of hashes (attributes and parameters). Returns a single proc that also returns a pair of hashes - the merged atributes and parameters.



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# File 'lib/dryml/template_environment.rb', line 537

def merge_tag_parameter(general_proc, overriding_proc)
  if overriding_proc.nil?
    general_proc
  else
    if overriding_proc.arity == 1
      # The override is a replace parameter - just pass it on
      overriding_proc
    else
      proc do
        overriding_attrs, overriding_parameters = overriding_proc.call
        general_attrs, general_parameters = general_proc.call

        attrs  = merge_attrs(general_attrs, overriding_attrs)
        overriding_default = overriding_parameters.delete(:default)
        params = merge_parameter_hashes(general_parameters, overriding_parameters)

        # The overrider should provide its :default as the new
        # 'default_content'
        if overriding_default
          params[:default] =
            if general_parameters[:default]
              proc do |default|
                overriding_default.call(proc { new_context { concat(general_parameters[:default].call(default)) } } )
              end
            else
              proc do |default|
                overriding_default.call(default)
              end
            end
        end

        [attrs, params]
      end
    end
  end
end

#new_context ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 283

def new_context
  ctx = [ @_this, @_this_parent, @_this_field, @_this_type,
          @_form_field_path, @_form_field_paths_by_object ]
  @_this_type = nil
  res = nil
  outer_res = @view.with_output_buffer { res = yield }
  Rails.logger.error("new_context: #{caller.first}") if !outer_res.blank? && outer_res.to_s != res.to_s
  @_this, @_this_parent, @_this_field, @_this_type, @_form_field_path, @_form_field_paths_by_object = ctx
  res.to_s
end

#new_field_context(field_path, new_this = nil) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 330

def new_field_context(field_path, new_this=nil)
  new_context do
    path = if field_path.is_a? String
             field_path.split('.')
           else
             Array(field_path)
           end
    if new_this
      raise ArgumentError, "invlaid context change" unless path.length == 1
      @_this_parent, @_this_field, @_this = this, path.first, new_this
    else
      parent, field, obj = Dryml.get_field_path(this, path)
      @_this, @_this_parent, @_this_field = obj, parent, field
    end

    if @_form_field_path
      @_form_field_path += path
      @_form_field_paths_by_object[@_this] = @_form_field_path
    end

    yield
  end
end

#new_object_context(new_this) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 301

def new_object_context(new_this)
  new_context do
    if new_this.respond_to?(:origin)
      refl = (new_this.origin && new_this.origin_attribute.is_a?(Symbol) && new_this.origin.class.respond_to?(:reflections) && new_this.origin.class.reflections[new_this.origin_attribute])
      if refl.nil? || refl.macro==:belongs_to || refl.macro==:has_one
        @_this_parent, @_this_field = new_this.origin, new_this.origin_attribute
      else
        # See bug #989 for more discussion.   The commented out
        # section is more 'correct', but it is expensive and since
        # nobody really ran into this before, setting to nil seems
        # more appropriate.
        @_this_parent, @_this_field = nil, nil
        #@_this_parent = new_this.origin.send(new_this.origin_attribute)
        #@_this_field = @_this_parent.index(new_this) || @_this_parent.length
      end
    else
      @_this_parent, @_this_field = [nil, nil]
    end
    @_this = new_this

    # We might have lost track of where 'this' is relative to the form_this
    # check if this or this_parent are objects we've seen before in this form
    @_form_field_path = find_form_field_path(new_this) if @_form_field_path

    yield
  end
end

#override_and_call_tag(the_tag, general_attributes, general_parameters, overriding_attributes, overriding_parameters) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 491

def override_and_call_tag(the_tag, general_attributes, general_parameters, overriding_attributes, overriding_parameters)
  attributes = overriding_attributes ? merge_attrs(general_attributes, overriding_attributes) : general_attributes
  if overriding_parameters
    overriding_default_content = overriding_parameters.delete(:default)
    parameters = general_parameters.merge(overriding_parameters)
  else
    parameters = general_parameters
  end

  default_content = parameters[:default]

  if the_tag.is_one_of?(String, Symbol) && the_tag.to_s.in?(Dryml.static_tags)
    body = if overriding_default_content
             new_context { overriding_default_content.call(proc { default_content.call(nil) if default_content }) }
           elsif default_content
             new_context { default_content.call(nil) }
           else
             nil
           end
    element(the_tag, attributes, body)
  else
    if default_content || overriding_default_content
      d = if overriding_default_content
            proc { |default| overriding_default_content.call(proc { default_content.call(default) if default_content }) }
          else
            proc { |default| default_content.call(default) if default_content }
          end
      parameters = parameters.merge(:default => d)
    end

    if the_tag.is_one_of?(String, Symbol)
      # It's a defined DRYML tag
      send(the_tag, attributes, parameters)
    else
      # It's a proc - restoring a replaced parameter
      the_tag.call(attributes, parameters)
    end
  end
end

#parse_for_type(attributes) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 216

def parse_for_type(attributes)
  t = attributes[:for_type]
  if t.nil?
    nil
  elsif t.is_a?(Class)
    t
  elsif t =~ /^[A-Z]/
    t.constantize
  elsif t =~ /^[a-z]/ && defined?(HoboFields.to_class)
    HoboFields.to_class(t)
  else
    nil
  end
end

#part_contexts_storage_uncoded ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 587

def part_contexts_storage_uncoded
  PartContext.client_side_storage_uncoded(@_part_contexts, session)
end

#path_for_form_field ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 56

def path_for_form_field
  @_form_field_path.nil? and raise Dryml::DrymlException,
    "DRYML cannot provide the correct form-field name here (this_field = #{this_field.inspect}, this = #{this.inspect})"
  @_form_field_path
end

#refresh_part(encoded_context, session, dom_id) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 189

def refresh_part(encoded_context, session, dom_id)
  context = Dryml::PartContext.for_refresh(encoded_context, @this, session)

  with_part_context(context) do
    send("#{context.part_name}_part", *context.locals)
  end
end

#register_form_field(name) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 404

def register_form_field(name)
  scope.form_field_names << name
end

#remove_classes!(attributes, *remove_classes) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 122

def remove_classes!(attributes, *remove_classes)
  if attributes[:class]
    attributes[:class] = (attributes[:class].split - remove_classes).join(' ')
  end
  attributes
end

#render_tag(tag_name, attributes) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 591

def render_tag(tag_name, attributes)
  method_name = tag_name.to_s.gsub('-', '_')
  if respond_to?(method_name)
    send(method_name, attributes).strip
  else
    false
  end
end

#repeat_attribute(string_or_array) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 270

def repeat_attribute(string_or_array)
  res = nil
  if string_or_array.instance_of?(String)
    new_field_context(string_or_array) do
       res = context_map { yield }
     end
  else
    res = context_map(string_or_array) { yield }
  end
  res.safe_join
end

#scope ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 155

def scope
  @_scoped_variables
end

#session ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 635

def session
  @view ? @view.session : {}
end

#this_field_reflection ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 96

def this_field_reflection
  this.try.proxy_association._?.reflection ||
    (this_parent && this_field && this_parent.class.respond_to?(:reflections) && this_parent.class.reflections[this_field.to_sym])
end

#this_key=(key) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 63

def this_key=(key)
  @_this_key = key
end

#this_type ⇒ Object

The type of this, or when this is nil, the type that would be expected in the current field



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# File 'lib/dryml/template_environment.rb', line 69

def this_type
  @_this_type ||= if this == false || this == true
                    Hobo::Boolean
                  elsif this
                    this.class
                  elsif this_parent && this_field && (parent_class = this_parent.class).respond_to?(:attr_type)
                    type = parent_class.attr_type(this_field)
                    if type.is_a?(ActiveRecord::Reflection::AssociationReflection)
                      reflection = type
                      if reflection.macro == :has_many
                        Array
                      elsif reflection.options[:polymorphic]
                        # All we know is that it will be some active-record type
                        ActiveRecord::Base
                      else
                        reflection.klass
                      end
                    else
                      type
                    end
                  else
                    # Nothing to go on at all
                    Object
                  end
end

#typed_id(object = nil, attribute = nil) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 160

def typed_id(object=nil, attribute=nil)
    if object.nil?
      # nothing passed -- use context
      if this_parent && this_field && !this_parent.respond_to?(:member_class)
        object, attribute = this_parent, this_field
      else
        object = this
      end
    end

    id = if (!object.is_a?(ActiveRecord::Relation) && typed_id = object.try.typed_id)
           typed_id
         elsif object == @this
           "this"
         end
    attribute ? "#{id}:#{attribute}" : id
end

#with_form_context(form_this = this, form_field_path = [form_this.class.name.underscore]) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 391

def with_form_context(form_this=this, form_field_path=[form_this.class.name.underscore])
  ctx = [@_form_this, @_form_field_path, @_form_field_paths_by_object]
  @_form_this = form_this
  @_form_field_path = form_field_path
  @_form_field_paths_by_object = { form_this => form_field_path }
  res = scope.new_scope :in_form => true, :form_field_names => [] do
    yield
  end
  @_form_this, @_form_field_path, @_form_field_paths_by_object = ctx
  res
end

#with_part_context(context, &block) ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 198

def with_part_context(context, &block)
  this, this_field = context.this, context.this_field

  b = if context.form_field_path
        proc { with_form_context(:unknown, context.form_field_path, &block) }
      else
        block
      end

  if this && this_field
    new_object_context(this) { new_field_context(this_field, &b) }
  elsif this
    new_object_context(this, &b)
  else
    new_context(&b)
  end
end

#yield_output_buffer ⇒ Object 



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# File 'lib/dryml/template_environment.rb', line 294

def yield_output_buffer
  res = nil
  @view.with_output_buffer { res = yield }
  res.to_s
end