Class: Kramdown::Element

Inherits:

Object

Object
Kramdown::Element

show all

Defined in:: lib/kramdown/element.rb

Overview

Represents all elements in the element tree.

kramdown only uses this one class for representing all available elements in an element tree (paragraphs, headers, emphasis, …). The type of element can be set via the #type accessor.

Following is a description of all supported element types.

Structural Elements

:root

Category: None
Usage context: As the root element of a document
Content model: Block-level elements

Represents the root of a kramdown document.

The root element contains the following option keys:

:encoding: When running on Ruby 1.9 this key has to be set to the encoding used for the text parts of the kramdown document.
:abbrev_defs: This key may be used to store the mapping of abbreviation to abbreviation definition.
:options: This key may be used to store options that were set during parsing of the document.

:blank

Category: Block-level element
Usage context: Where block-level elements are expected
Content model: Empty

Represents one or more blank lines. It is not allowed to have two or more consecutive blank elements.

The value field may contain the original content of the blank lines.

:p

Category: Block-level element
Usage context: Where block-level elements are expected
Content model: Span-level elements

Represents a paragraph.

If the option :transparent is true, this element just represents a block of text. I.e. this element just functions as a container for span-level elements.

:header

Category: Block-level element
Usage context: Where block-level elements are expected
Content model: Span-level elements

Represents a header.

The option :level specifies the header level and has to contain a number between 1 and 6. The option :raw_text has to contain the raw header text.

:blockquote

Category: Block-level element
Usage context: Where block-level elements are expected
Content model: Block-level elements

Represents a blockquote.

:codeblock

Category: Block-level element
Usage context: Where block-level elements are expected
Content model: Empty

Represents a code block, i.e. a block of text that should be used as-is.

The value field has to contain the content of the code block.

:ul

Category: Block-level element
Usage context: Where block-level elements are expected
Content model: One or more :li elements

Represents an unordered list.

:ol

Category: Block-level element
Usage context: Where block-level elements are expected
Content model: One or more :li elements

Represents an ordered list.

:li

Category: None
Usage context: Inside :ol and :ul elements
Content model: Block-level elements

Represents a list item of an ordered or unordered list.

Note that the first child of a list item must not be a :blank element!

:dl

Category: Block-level element
Usage context: Where block-level elements are expected
Content model: One or more groups each consisting of one or more :dt elements followed by one or more :dd elements.

Represents a definition list which contains groups consisting of terms and definitions for them.

:dt

Category: None
Usage context: Before :dt or :dd elements inside a :dl elment
Content model: Span-level elements

Represents the term part of a term-definition group in a definition list.

:dd

Category: None
Usage context: After :dt or :dd elements inside a :dl elment
Content model: Block-level elements

Represents the definition part of a term-definition group in a definition list.

:hr

Category: Block-level element
Usage context: Where block-level elements are expected
Content model: None

Represents a horizontal line.

:table

Category: Block-level element
Usage context: Where block-level elements are expected
Content model: Zero or one :thead elements, one or more :tbody elements, zero or one :tfoot elements

Represents a table. Each table row (i.e. :tr element) of the table has to contain the same number of :td elements.

The option :alignment has to be an array containing the alignment values, exactly one for each column of the table. The possible alignment values are :left, :center, :right and :default.

:thead

Category: None
Usage context: As first element inside a :table element
Content model: One or more :tr elements

Represents the table header.

:tbody

Category: None
Usage context: After a :thead element but before a :tfoot element inside a :table element
Content model: One or more :tr elements

Represents a table body.

:tfoot

Category: None
Usage context: As last element inside a :table element
Content model: One or more :tr elements

Represents the table footer.

:tr

Category: None
Usage context: Inside :thead, :tbody and :tfoot elements
Content model: One or more :td elements

Represents a table row.

:td

Category: None
Usage context: Inside :tr elements
Content model: As child of :thead/:tr span-level elements, as child of :tbody/:tr and :tfoot/:tr block-level elements

Represents a table cell.

:math

Category: Block/span-level element
Usage context: Where block/span-level elements are expected
Content model: None

Represents mathematical text that is written in LaTeX.

The value field has to contain the actual mathematical text.

The option :category has to be set to either :span or :block depending on the context where the element is used.

Text Markup Elements

:text

Category: Span-level element
Usage context: Where span-level elements are expected
Content model: None

Represents text.

The value field has to contain the text itself.

:br

Category: Span-level element
Usage context: Where span-level elements are expected
Content model: None

Represents a hard line break.

:a

Category: Span-level element
Usage context: Where span-level elements are expected
Content model: Span-level elements

Represents a link to an URL.

The attribute href has to be set to the URL to which the link points. The attribute title optionally contains the title of the link.

:img

Category: Span-level element
Usage context: Where span-level elements are expected
Content model: None

Represents an image.

The attribute src has to be set to the URL of the image. The attribute alt has to contain a text description of the image. The attribute title optionally contains the title of the image.

:codespan

Category: Span-level element
Usage context: Where span-level elements are expected
Content model: None

Represents verbatim text.

The value field has to contain the content of the code span.

:footnote

Category: Span-level element
Usage context: Where span-level elements are expected
Content model: None

Represents a footnote marker.

The value field has to contain an element whose children are the content of the footnote. The option :name has to contain a valid and unique footnote name. A valid footnote name consists of a word character or a digit and then optionally followed by other word characters, digits or dashes.

:em

Category: Span-level element
Usage context: Where span-level elements are expected
Content model: Span-level elements

Represents emphasis of its contents.

:strong

Category: Span-level element
Usage context: Where span-level elements are expected
Content model: Span-level elements

Represents strong importance for its contents.

:entity

Category: Span-level element
Usage context: Where span-level elements are expected
Content model: None

Represents an HTML entity.

The value field has to contain an instance of Kramdown::Utils::Entities::Entity. The option :original can be used to store the original representation of the entity.

:typographic_sym

Category: Span-level element
Usage context: Where span-level elements are expected
Content model: None

Represents a typographic symbol.

The value field needs to contain a Symbol representing the specific typographic symbol from the following list:

:mdash: An mdash character (—)
:ndash: An ndash character (–)
:hellip: An ellipsis (…)
:laquo: A left guillemet (<<)
:raquo: A right guillemet (>>)
:laquo_space: A left guillemet with a space (<< )
:raquo_space: A right guillemet with a space ( >>)

:smart_quote

Category: Span-level element
Usage context: Where span-level elements are expected
Content model: None

Represents a quotation character.

The value field needs to contain a Symbol representing the specific quotation character:

:lsquo: Left single quote
:rsquo: Right single quote
:ldquo: Left double quote
:rdquo: Right double quote

:abbreviation

Category: Span-level element
Usage context: Where span-level elements are expected
Content model: None

Represents a text part that is an abbreviation.

The value field has to contain the text part that is the abbreviation. The definition of the abbreviation is stored in the :root element of the document.

Other Elements

:html_element

Category: Block/span-level element
Usage context: Where block/span-level elements or raw HTML elements are expected
Content model: Depends on the element

Represents an HTML element.

The value field has to contain the name of the HTML element the element is representing.

The option :category has to be set to either :span or :block depending on the whether the element is a block-level or a span-level element. The option :content_model has to be set to the content model for the element (either :block if it contains block-level elements, :span if it contains span-level elements or :raw if it contains raw content).

:xml_comment

Category: Block/span-level element
Usage context: Where block/span-level elements are expected or in raw HTML elements
Content model: None

Represents an XML/HTML comment.

The value field has to contain the whole XML/HTML comment including the delimiters.

The option :category has to be set to either :span or :block depending on the context where the element is used.

:xml_pi

Category: Block/span-level element
Usage context: Where block/span-level elements are expected or in raw HTML elements
Content model: None

Represents an XML/HTML processing instruction.

The value field has to contain the whole XML/HTML processing instruction including the delimiters.

The option :category has to be set to either :span or :block depending on the context where the element is used.

:comment

Category: Block/span-level element
Usage context: Where block/span-level elements are expected
Content model: None

Represents a comment.

The value field has to contain the comment.

The option :category has to be set to either :span or :block depending on the context where the element is used. If it is set to :span, then no blank lines are allowed in the comment.

:raw

Category: Block/span-level element
Usage context: Where block/span-level elements are expected
Content model: None

Represents a raw string that should not be modified. For example, the element could contain some HTML code that should be output as-is without modification and escaping.

The value field has to contain the actual raw text.

The option :category has to be set to either :span or :block depending on the context where the element is used. If it is set to :span, then no blank lines are allowed in the raw text.

The option :type can be set to an array of strings to define for which converters the raw string is valid.

Constant Summary collapse

CATEGORY = :nodoc:

{}

Instance Attribute Summary collapse

#children ⇒ Object

The child elements of this element.
#type ⇒ Object

A symbol representing the element type.
#value ⇒ Object

The value of the element.

Class Method Summary collapse

.category(el) ⇒ Object

Return the category of el which can be :block, :span or nil.

Instance Method Summary collapse

#attr ⇒ Object

The attributes of the element.
#initialize(type, value = nil, attr = nil, options = nil) ⇒ Element constructor

Create a new Element object of type type.
#inspect ⇒ Object

:nodoc:.
#options ⇒ Object

The options hash for the element.

Constructor Details

#initialize(type, value = nil, attr = nil, options = nil) ⇒ `Element`

Create a new Element object of type type. The optional parameters value, attr and options can also be set in this constructor for convenience.

# File 'lib/kramdown/element.rb', line 490

def initialize(type, value = nil, attr = nil, options = nil)
  @type, @value, @attr, @options = type, value, (Utils::OrderedHash.new.merge!(attr) if attr), options
  @children = []
end

Instance Attribute Details

#children ⇒ `Object`

The child elements of this element.



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# File 'lib/kramdown/element.rb', line 485

def children
  @children
end

#type ⇒ `Object`

A symbol representing the element type. For example, :p or :blockquote.



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# File 'lib/kramdown/element.rb', line 478

def type
  @type
end

#value ⇒ `Object`

The value of the element. The interpretation of this field depends on the type of the element. Many elements don’t use this field.



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# File 'lib/kramdown/element.rb', line 482

def value
  @value
end

Class Method Details

.category(el) ⇒ `Object`

Return the category of el which can be :block, :span or nil.

Most elements have a fixed category, however, some elements can either appear in a block-level or a span-level context. These elements need to have the option :category correctly set.



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# File 'lib/kramdown/element.rb', line 518

def self.category(el)
  CATEGORY[el.type] || el.options[:category]
end

Instance Method Details

#attr ⇒ `Object`

The attributes of the element. Uses an Utils::OrderedHash to retain the insertion order.



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# File 'lib/kramdown/element.rb', line 496

def attr
  @attr ||= Utils::OrderedHash.new
end

#inspect ⇒ `Object`

:nodoc:



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# File 'lib/kramdown/element.rb', line 505

def inspect #:nodoc:
  "<kd:#{@type}#{@value.nil? ? '' : ' ' + @value.inspect} #{@attr.inspect}#{options.empty? ? '' : ' ' + @options.inspect}#{@children.empty? ? '' : ' ' + @children.inspect}>"
end

#options ⇒ `Object`

The options hash for the element. It is used for storing arbitray options.



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# File 'lib/kramdown/element.rb', line 501

def options
  @options ||= {}
end

Class: Kramdown::Element

Overview

Structural Elements

:root

:blank

:p

:header

:blockquote

:codeblock

:ul

:ol

:li

:dl

:dt

:dd

:hr

:table

:thead

:tbody

:tfoot

:tr

:td

:math

Text Markup Elements

:text

:br

:a

:img

:codespan

:footnote

:em

:strong

:entity

:typographic_sym

:smart_quote

:abbreviation

Other Elements

:html_element

:xml_comment

:xml_pi

:comment

:raw

Constant Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(type, value = nil, attr = nil, options = nil) ⇒ Element

Instance Attribute Details

#children ⇒ Object

#type ⇒ Object

#value ⇒ Object

Class Method Details

.category(el) ⇒ Object

Instance Method Details

#attr ⇒ Object

#inspect ⇒ Object

#options ⇒ Object

#initialize(type, value = nil, attr = nil, options = nil) ⇒ `Element`

#children ⇒ `Object`

#type ⇒ `Object`

#value ⇒ `Object`

.category(el) ⇒ `Object`

#attr ⇒ `Object`

#inspect ⇒ `Object`

#options ⇒ `Object`