class Asciidoctor::AbstractNode

Public: An abstract base class that provides state and methods for managing a node of AsciiDoc content. The state and methods on this class are comment to all content segments in an AsciiDoc document.

Attributes

attributes[R]

Public: Get the Hash of attributes for this node

context[R]

Public: Get the Symbol context for this node

document[R]

Public: Get the Asciidoctor::Document to which this node belongs

id[RW]

Public: Get the id of this node

parent[R]

Public: Get the element which is the parent of this node

Public Class Methods

new(parent, context) click to toggle source
# File lib/asciidoctor/abstract_node.rb, line 24
def initialize(parent, context)
  @parent = (context != :document ? parent : nil)

  if !parent.nil?
    @document = parent.is_a?(Document) ? parent : parent.document
  else
    @document = nil
  end
  
  @context = context
  @attributes = {}
  @passthroughs = []
end

Public Instance Methods

attr(name, default = nil, inherit = true) click to toggle source

Public: Get the value of the specified attribute

Get the value for the specified attribute. First look in the attributes on this node and return the value of the attribute if found. Otherwise, if this node is a child of the Document node, look in the attributes of the Document node and return the value of the attribute if found. Otherwise, return the default value, which defaults to nil.

name - the String or Symbol name of the attribute to lookup default - the Object value to return if the attribute is not found (default: nil) inherit - a Boolean indicating whether to check for the attribute on the

AsciiDoctor::Document if not found on this node (default: false)

return the value of the attribute or the default value if the attribute is not found in the attributes of this node or the document node

# File lib/asciidoctor/abstract_node.rb, line 53
def attr(name, default = nil, inherit = true)
  name = name.to_s if name.is_a?(Symbol)
  inherit = false if self == @document
  if !inherit
    default.nil? ? @attributes[name] : @attributes.fetch(name, default)
  else
    default.nil? ? @attributes.fetch(name, @document.attr(name)) :
        @attributes.fetch(name, @document.attr(name, default))
  end
end
attr?(name, expect = nil, inherit = true) click to toggle source

Public: Check if the attribute is defined, optionally performing a comparison of its value if expected is not nil

Check if the attribute is defined. First look in the attributes on this node. If not found, and this node is a child of the Document node, look in the attributes of the Document node. If the attribute is found and a comparison value is specified (not nil), return whether the two values match. Otherwise, return whether the attribute was found.

name - the String or Symbol name of the attribute to lookup expect - the expected Object value of the attribute (default: nil) inherit - a Boolean indicating whether to check for the attribute on the

AsciiDoctor::Document if not found on this node (default: false)

return a Boolean indicating whether the attribute exists and, if a comparison value is specified, whether the value of the attribute matches the comparison value

# File lib/asciidoctor/abstract_node.rb, line 81
def attr?(name, expect = nil, inherit = true)
  name = name.to_s if name.is_a?(Symbol)
  inherit = false if self == @document
  if expect.nil?
    if @attributes.has_key? name
      true
    elsif inherit
      @document.attributes.has_key? name
    else
      false
    end
  else
    if @attributes.has_key? name
      @attributes[name] == expect
    elsif inherit && @document.attributes.has_key?(name)
      @document.attributes[name] == expect
    else
      false
    end
  end
end
generate_data_uri(target_image, asset_dir_key = nil) click to toggle source

Public: Generate a data URI that can be used to embed an image in the output document

First, and foremost, the target image path is cleaned if the document safe mode level is set to at least SafeMode::SAFE (a condition which is true by default) to prevent access to ancestor paths in the filesystem. The image data is then read and converted to Base64. Finally, a data URI is built which can be used in an image tag.

target_image - A String path to the target image asset_dir_key - The String attribute key used to lookup the directory where

the image is located (default: nil)

Returns A String data URI containing the content of the target image

# File lib/asciidoctor/abstract_node.rb, line 257
def generate_data_uri(target_image, asset_dir_key = nil)
  Helpers.require_library 'base64'

  ext = File.extname(target_image)[1..-1]
  mimetype = 'image/' + ext
  mimetype = "#{mimetype}+xml" if ext == 'svg'
  if asset_dir_key
    #asset_dir_path = normalize_system_path(@document.attr(asset_dir_key), nil, nil, :target_name => asset_dir_key)
    #image_path = normalize_system_path(target_image, asset_dir_path, nil, :target_name => 'image')
    image_path = normalize_system_path(target_image, @document.attr(asset_dir_key), nil, :target_name => 'image')
  else
    image_path = normalize_system_path(target_image)
  end

  if !File.readable? image_path
    puts "asciidoctor: WARNING: image to embed not found or not readable: #{image_path}"
    return "data:#{mimetype}:base64,"
    #return 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=='
  end

  bindata = nil
  if IO.respond_to? :binread
    bindata = IO.binread(image_path)
  else
    bindata = File.open(image_path, 'rb') {|file| file.read }
  end
  "data:#{mimetype};base64,#{Base64.encode64(bindata).delete("\n")}"
end
get_binding(template) click to toggle source

Public: Get the execution context of this object (via Kernel#binding).

This method is used to set the 'self' reference as well as local variables that map to this method's arguments during the evaluation of a backend template.

Each object in Ruby has a binding context that can be used to set the 'self' reference in an evaluation context. Any arguments passed to this method are also available in the execution environment.

template - The BaseTemplate instance in which this binding will be active.

Bound to the local variable of the same name, template.

returns the execution context for this object so it can be be transferred to the backend template and binds the method arguments as local variables in that same environment.

# File lib/asciidoctor/abstract_node.rb, line 140
def get_binding template
  binding
end
icon_uri(name) click to toggle source

Public: Construct a reference or data URI to an icon image for the specified icon name.

If the 'icon' attribute is set on this block, the name is ignored and the value of this attribute is used as the target image path. Otherwise, construct a target image path by concatenating the value of the 'iconsdir' attribute, the icon name and the value of the 'icontype' attribute (defaulting to 'png').

The target image path is then passed through the image_uri() method. If the 'data-uri' attribute is set on the document, the image will be safely converted to a data URI.

The return value of this method can be safely used in an image tag.

name - The String name of the icon

Returns A String reference or data URI for an icon image

# File lib/asciidoctor/abstract_node.rb, line 182
def icon_uri(name)
  if attr? 'icon'
    image_uri(attr('icon'), nil)
  else
    image_uri("#{name}.#{@document.attr('icontype', 'png')}", 'iconsdir')
  end
end
image_uri(target_image, asset_dir_key = 'imagesdir') click to toggle source

Public: Construct a URI reference or data URI to the target image.

If the target image is a URI reference, then leave it untouched.

The target image is resolved relative to the directory retrieved from the specified attribute key, if provided.

If the 'data-uri' attribute is set on the document, and the safe mode level is less than SafeMode::SECURE, the image will be safely converted to a data URI by reading it from the same directory. If neither of these conditions are satisfied, a relative path (i.e., URL) will be returned.

The return value of this method can be safely used in an image tag.

target_image - A String path to the target image asset_dir_key - The String attribute key used to lookup the directory where

the image is located (default: 'imagesdir')

Returns A String reference or data URI for the target image

# File lib/asciidoctor/abstract_node.rb, line 233
def image_uri(target_image, asset_dir_key = 'imagesdir')
  if target_image.include?(':') && target_image.match(Asciidoctor::REGEXP[:uri_sniff])
    target_image
  elsif @document.safe < Asciidoctor::SafeMode::SECURE && @document.attr?('data-uri')
    generate_data_uri(target_image, asset_dir_key)
  elsif asset_dir_key && attr?(asset_dir_key)
    normalize_web_path(target_image, @document.attr(asset_dir_key))
  else
    normalize_web_path(target_image)
  end
end
media_uri(target, asset_dir_key = 'imagesdir') click to toggle source

Public: Construct a URI reference to the target media.

If the target media is a URI reference, then leave it untouched.

The target media is resolved relative to the directory retrieved from the specified attribute key, if provided.

The return value can be safely used in a media tag (img, audio, video).

target - A String reference to the target media asset_dir_key - The String attribute key used to lookup the directory where

the media is located (default: 'imagesdir')

Returns A String reference for the target media

# File lib/asciidoctor/abstract_node.rb, line 204
def media_uri(target, asset_dir_key = 'imagesdir')
  if target.include?(':') && target.match(Asciidoctor::REGEXP[:uri_sniff])
    target
  elsif asset_dir_key && attr?(asset_dir_key)
    normalize_web_path(target, @document.attr(asset_dir_key))
  else
    normalize_web_path(target)
  end
end
normalize_asset_path(asset_ref, asset_name = 'path', autocorrect = true) click to toggle source

Public: Normalize the asset file or directory to a concrete and rinsed path

Delegates to #normalize_system_path, with the start path set to the value of the base_dir instance variable on the Document object.

# File lib/asciidoctor/abstract_node.rb, line 356
def normalize_asset_path(asset_ref, asset_name = 'path', autocorrect = true)
  normalize_system_path(asset_ref, @document.base_dir, nil,
      :target_name => asset_name, :recover => autocorrect)
end
normalize_system_path(target, start = nil, jail = nil, opts = {}) click to toggle source

Public: Resolve and normalize a secure path from the target and start paths using the PathResolver.

See PathResolver::system_path(target, start, jail, opts) for details.

The most important functionality in this method is to prevent resolving a path outside of the jail (which defaults to the directory of the source file, stored in the base_dir instance variable on Document) if the document safe level is set to SafeMode::SAFE or greater (a condition which is true by default).

target - the String target path start - the String start (i.e., parent) path jail - the String jail path to confine the resolved path opts - an optional Hash of options to control processing (default: {}):

* :recover is used to control whether the processor should auto-recover
    when an illegal path is encountered
* :target_name is used in messages to refer to the path being resolved

raises a SecurityError if a jail is specified and the resolved path is outside the jail.

returns a String path resolved from the start and target paths, with any parent references resolved and self references removed. If a jail is provided, this path will be guaranteed to be contained within the jail.

# File lib/asciidoctor/abstract_node.rb, line 342
def normalize_system_path(target, start = nil, jail = nil, opts = {})
  if start.nil?
    start = @document.base_dir
  end
  if jail.nil? && @document.safe >= SafeMode::SAFE
    jail = @document.base_dir
  end
  PathResolver.new.system_path(target, start, jail, opts)
end
normalize_web_path(target, start = nil) click to toggle source

Public: Normalize the web page using the PathResolver.

See PathResolver::web_path(target, start) for details.

target - the String target path start - the String start (i.e, parent) path (optional, default: nil)

returns the resolved String path

# File lib/asciidoctor/abstract_node.rb, line 313
def normalize_web_path(target, start = nil)
  PathResolver.new.web_path(target, start)
end
read_asset(path, warn_on_failure = false) click to toggle source

Public: Read the contents of the file at the specified path. This method assumes that the path is safe to read. It checks that the file is readable before attempting to read it.

path - the String path from which to read the contents warn_on_failure - a Boolean that controls whether a warning is issued if

the file cannot be read

returns the contents of the file at the specified path, or nil if the file does not exist.

# File lib/asciidoctor/abstract_node.rb, line 296
def read_asset(path, warn_on_failure = false)
  if File.readable? path
    File.read(path).chomp
  else
    puts "asciidoctor: WARNING: file does not exist or cannot be read: #{path}" if warn_on_failure
    nil
  end
end
renderer() click to toggle source

Public: Get the Asciidoctor::Renderer instance being used for the Asciidoctor::Document to which this node belongs

# File lib/asciidoctor/abstract_node.rb, line 160
def renderer
  @document.renderer
end
set_attr(key, val, overwrite = nil) click to toggle source

Public: Assign the value to the specified key in this block's attributes hash.

key - The attribute key (or name) val - The value to assign to the key

returns a flag indicating whether the assignment was performed

# File lib/asciidoctor/abstract_node.rb, line 110
def set_attr(key, val, overwrite = nil)
  if overwrite.nil?
    @attributes[key] = val
    true
  else
    if overwrite || @attributes.has_key?(key)
      @attributes[key] = val
      true
    else
      false
    end
  end
end
update_attributes(attributes) click to toggle source

Public: Update the attributes of this node with the new values in the attributes argument.

If an attribute already exists with the same key, it's value will be overridden.

attributes - A Hash of attributes to assign to this node.

returns nothing

# File lib/asciidoctor/abstract_node.rb, line 153
def update_attributes(attributes)
  @attributes.update(attributes)
  nil
end