class RDoc::CrossReference

RDoc::CrossReference is a reusable way to create cross references for names.

Constants

ALL_CROSSREF_REGEXP

Version of CROSSREF_REGEXP used when --hyperlink-all is specified.

CLASS_REGEXP_STR

Regular expression to match class references

  1. There can be a ‘\’ in front of text to suppress the cross-reference

  2. There can be a ‘::’ in front of class names to reference from the top-level namespace.

  3. The method can be followed by parenthesis (not recommended)

CROSSREF_REGEXP

Regular expressions matching text that should potentially have cross-reference links generated are passed to add_regexp_handling. Note that these expressions are meant to pick up text for which cross-references have been suppressed, since the suppression characters are removed by the code that is triggered.

METHOD_REGEXP_STR

Regular expression to match method references.

See CLASS_REGEXP_STR

Attributes

seen[RW]

Hash of references that have been looked-up to their replacements

Public Class Methods

new(context) click to toggle source

Allows cross-references to be created based on the given context (RDoc::Context).

# File lib/rdoc/cross_reference.rb, line 111
def initialize context
  @context = context
  @store   = context.store

  @seen = {}
end

Public Instance Methods

resolve(name, text) click to toggle source

Returns a reference to name.

If the reference is found and name is not documented text will be returned. If name is escaped name is returned. If name is not found text is returned.

# File lib/rdoc/cross_reference.rb, line 125
def resolve name, text
  return @seen[name] if @seen.include? name

  if /#{CLASS_REGEXP_STR}([.#]|::)#{METHOD_REGEXP_STR}/o =~ name then
    type = $2
    if '.' == type # will find either #method or ::method
      method = $3
    else
      method = "#{type}#{$3}"
    end
    container = @context.find_symbol_module($1)
  elsif /^([.#]|::)#{METHOD_REGEXP_STR}/o =~ name then
    type = $1
    if '.' == type
      method = $2
    else
      method = "#{type}#{$2}"
    end
    container = @context
  else
    type = nil
    container = nil
  end

  if container then
    unless RDoc::TopLevel === container then
      if '.' == type then
        if 'new' == method then # AnyClassName.new will be class method
          ref = container.find_local_symbol method
          ref = container.find_ancestor_local_symbol method unless ref
        else
          ref = container.find_local_symbol "::#{method}"
          ref = container.find_ancestor_local_symbol "::#{method}" unless ref
          ref = container.find_local_symbol "##{method}" unless ref
          ref = container.find_ancestor_local_symbol "##{method}" unless ref
        end
      else
        ref = container.find_local_symbol method
        ref = container.find_ancestor_local_symbol method unless ref
      end
    end
  end

  ref = case name
        when /^\\(#{CLASS_REGEXP_STR})$/o then
          @context.find_symbol $1
        else
          @context.find_symbol name
        end unless ref

  # Try a page name
  ref = @store.page name if not ref and name =~ /^[\w.]+$/

  ref = nil if RDoc::Alias === ref # external alias, can't link to it

  out = if name == '\\' then
          name
        elsif name =~ /^\\/ then
          # we remove the \ only in front of what we know:
          # other backslashes are treated later, only outside of <tt>
          ref ? $' : name
        elsif ref then
          if ref.display? then
            ref
          else
            text
          end
        else
          text
        end

  @seen[name] = out

  out
end