class RDoc::Markup::ToHtmlCrossref

Subclass of the RDoc::Markup::ToHtml class that supports looking up method names, classes, etc to create links. RDoc::CrossReference is used to generate those links based on the current context.

Attributes

context[RW]

RDoc::CodeObject for generating references

show_hash[RW]

Should we show '#' characters on method references?

Public Class Methods

new(options, from_path, context, markup = nil) click to toggle source

Creates a new crossref resolver that generates links relative to context which lives at from_path in the generated files. '#' characters on references are removed unless show_hash is true. Only method names preceded by '#' or '::' are linked, unless hyperlink_all is true.

Calls superclass method RDoc::Markup::ToHtml::new

# File lib/rdoc/markup/to_html_crossref.rb, line 32
def initialize(options, from_path, context, markup = nil)
  raise ArgumentError, 'from_path cannot be nil' if from_path.nil?

  super options, markup

  @context       = context
  @from_path     = from_path
  @hyperlink_all = @options.hyperlink_all
  @show_hash     = @options.show_hash

  crossref_re = @hyperlink_all ? ALL_CROSSREF_REGEXP : CROSSREF_REGEXP
  @markup.add_special crossref_re, :CROSSREF

  @cross_reference = RDoc::CrossReference.new @context
end

Public Instance Methods

cross_reference(name, text = nil) click to toggle source

Creates a link to the reference name if the name exists. If text is given it is used as the link text, otherwise name is used.

# File lib/rdoc/markup/to_html_crossref.rb, line 52
def cross_reference name, text = nil
  lookup = name

  name = name[1..-1] unless @show_hash if name[0, 1] == '#'

  name = "#{CGI.unescape $'} at #{$1}" if name =~ /(.*[^#:])@/

  text = name unless text

  link lookup, text
end

gen_url(url, text) click to toggle source

Generates links for rdoc-ref: scheme URLs and allows RDoc::Markup::ToHtml to handle other schemes.

Calls superclass method RDoc::Markup::ToHtml#gen_url

# File lib/rdoc/markup/to_html_crossref.rb, line 119
def gen_url url, text
  return super unless url =~ /\Ardoc-ref:/

  cross_reference $', text
end

handle_special_CROSSREF(special) click to toggle source

We're invoked when any text matches the CROSSREF pattern. If we find the corresponding reference, generate a link. If the name we're looking for contains no punctuation, we look for it up the module/class chain. For example, ToHtml is found, even without the RDoc::Markup:: prefix, because we look for it in module Markup first.

# File lib/rdoc/markup/to_html_crossref.rb, line 71
def handle_special_CROSSREF(special)
  name = special.text

  return name if name =~ /@[\w-]+\.[\w-]/ # labels that look like emails

  unless @hyperlink_all then
    # This ensures that words entirely consisting of lowercase letters will
    # not have cross-references generated (to suppress lots of erroneous
    # cross-references to "new" in text, for instance)
    return name if name =~ /\A[a-z]*\z/
  end

  cross_reference name
end

handle_special_HYPERLINK(special) click to toggle source

Handles rdoc-ref: scheme links and allows RDoc::Markup::ToHtml to handle other schemes.

Calls superclass method RDoc::Markup::ToHtml#handle_special_HYPERLINK

# File lib/rdoc/markup/to_html_crossref.rb, line 90
def handle_special_HYPERLINK special
  return cross_reference $' if special.text =~ /\Ardoc-ref:/

  super
end

handle_special_RDOCLINK(special) click to toggle source

special is an rdoc-schemed link that will be converted into a hyperlink. For the rdoc-ref scheme the cross-reference will be looked up and the given name will be used.

All other contents are handled by the superclass

Calls superclass method RDoc::Markup::ToHtml#handle_special_RDOCLINK

# File lib/rdoc/markup/to_html_crossref.rb, line 104
def handle_special_RDOCLINK special
  url = special.text

  case url
  when /\Ardoc-ref:/ then
    cross_reference $'
  else
    super
  end
end

link(name, text) click to toggle source

Creates an HTML link to name with the given text.

# File lib/rdoc/markup/to_html_crossref.rb, line 128
def link name, text
  original_name = name

  if name =~ /(.*[^#:])@/ then
    name = $1
    label = $'
  end

  ref = @cross_reference.resolve name, text

  text = ref.output_name @context if
    RDoc::MethodAttr === ref and text == original_name

  case ref
  when String then
    ref
  else
    path = ref.as_href @from_path

    if path =~ /#/ then
      path << "-label-#{label}"
    elsif ref.sections and
          ref.sections.any? { |section| label == section.title } then
      path << "##{label}"
    else
      path << "#label-#{label}"
    end if label

    "<a href=\"#{path}\">#{text}</a>"
  end
end