Module: Kramdown::Utils::Html

Included in:
Converter::Html, Converter::Kramdown
Defined in:
lib/kramdown/utils/html.rb

Overview

Provides convenience methods for HTML related tasks.

Note that this module has to be mixed into a class that has a @root (containing an element of type :root) and an @options (containing an options hash) instance variable so that some of the methods can work correctly.

Constant Summary collapse

ESCAPE_MAP =

:stopdoc:

{
  '<' => '&lt;',
  '>' => '&gt;',
  '&' => '&amp;',
  '"' => '&quot;',
}
ESCAPE_ALL_RE = 
/<|>|&/
ESCAPE_TEXT_RE = 
Regexp.union(REXML::Parsers::BaseParser::REFERENCE_RE, /<|>|&/)
ESCAPE_ATTRIBUTE_RE = 
Regexp.union(REXML::Parsers::BaseParser::REFERENCE_RE, /<|>|&|"/)
ESCAPE_RE_FROM_TYPE = 
{all: ESCAPE_ALL_RE, text: ESCAPE_TEXT_RE, attribute: ESCAPE_ATTRIBUTE_RE}
REDUNDANT_LINE_BREAK_REGEX = 
/([\p{Han}\p{Hiragana}\p{Katakana}]+)\n([\p{Han}\p{Hiragana}\p{Katakana}]+)/u

Instance Method Summary collapse

Instance Method Details

#entity_to_str(e, original = nil) ⇒ Object

Convert the entity e to a string. The optional parameter original may contain the original representation of the entity.

This method uses the option entity_output to determine the output form for the entity.



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# File 'lib/kramdown/utils/html.rb', line 27

def entity_to_str(e, original = nil)
  entity_output = @options[:entity_output]

  if entity_output == :as_char &&
      (c = e.char.encode(@root.options[:encoding]) rescue nil) &&
      ((c = e.char) == '"' || !ESCAPE_MAP.key?(c))
    c
  elsif (entity_output == :as_input || entity_output == :as_char) && original
    original
  elsif (entity_output == :symbolic || ESCAPE_MAP.key?(e.char)) && !e.name.nil?
    "&#{e.name};"
  else # default to :numeric
    "&##{e.code_point};"
  end
end

#escape_html(str, type = :all) ⇒ Object

Escape the special HTML characters in the string str. The parameter type specifies what is escaped: :all - all special HTML characters except the quotation mark as well as entities, :text - all special HTML characters except the quotation mark but no entities and :attribute - all special HTML characters including the quotation mark but no entities.



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# File 'lib/kramdown/utils/html.rb', line 69

def escape_html(str, type = :all)
  str.gsub(ESCAPE_RE_FROM_TYPE[type]) {|m| ESCAPE_MAP[m] || m }
end

#fix_cjk_line_break(str) ⇒ Object 



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# File 'lib/kramdown/utils/html.rb', line 74

def fix_cjk_line_break(str)
  while str.gsub!(REDUNDANT_LINE_BREAK_REGEX, '\1\2')
  end
  str
end

#html_attributes(attr) ⇒ Object

Return the HTML representation of the attributes attr.



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# File 'lib/kramdown/utils/html.rb', line 44

def html_attributes(attr)
  return '' if attr.empty?

  attr.map do |k, v|
    v.nil? || (k == 'id' && v.strip.empty?) ? '' : " #{k}=\"#{escape_html(v.to_s, :attribute)}\""
  end.join('')
end