Separate HTML linking and crossreferencing into separate files.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@15453 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rdoc/markup/to_html_crossref.rb

@@ -0,0 +1,86 @@
+require 'rdoc/markup/to_html'
+
+##
+# Subclass of the RDoc::Markup::ToHtml class that supports looking up words in
+# the AllReferences list. Those that are found (like AllReferences in this
+# comment) will be hyperlinked
+
+class RDoc::Markup::ToHtmlCrossref < RDoc::Markup::ToHtml
+
+  attr_accessor :context
+
+  ##
+  # We need to record the html path of our caller so we can generate
+  # correct relative paths for any hyperlinks that we find
+
+  def initialize(from_path, context, show_hash)
+    super()
+
+    # class names, variable names, or instance variables
+    @markup.add_special(/(
+                           # A::B.meth(**) (for operator in Fortran95)
+                           \w+(::\w+)*[.\#]\w+(\([\.\w+\*\/\+\-\=\<\>]+\))?
+                           # meth(**) (for operator in Fortran95)
+                         | \#\w+(\([.\w\*\/\+\-\=\<\>]+\))?
+                         | \b([A-Z]\w*(::\w+)*[.\#]\w+)  #    A::B.meth
+                         | \b([A-Z]\w+(::\w+)*)          #    A::B
+                         | \#\w+[!?=]?                   #    #meth_name
+                         | \\?\b\w+([_\/\.]+\w+)*[!?=]?  #    meth_name
+                         )/x,
+                        :CROSSREF)
+
+    @from_path = from_path
+    @context = context
+    @show_hash = show_hash
+
+    @seen = {}
+  end
+
+  ##
+  # We're invoked when any text matches the CROSSREF pattern
+  # (defined in MarkUp). If we fine the corresponding reference,
+  # generate a hyperlink. If the name we're looking for contains
+  # no punctuation, we look for it up the module/class chain. For
+  # example, HyperlinkHtml is found, even without the Generator::
+  # prefix, because we look for it in module Generator first.
+
+  def handle_special_CROSSREF(special)
+    name = special.text
+
+    return @seen[name] if @seen.include? name
+
+    if name[0,1] == '#' then
+      lookup = name[1..-1]
+      name = lookup unless @show_hash
+    else
+      lookup = name
+    end
+
+    # Find class, module, or method in class or module.
+    if /([A-Z]\w*)[.\#](\w+[!?=]?)/ =~ lookup then
+      container = $1
+      method = $2
+      ref = @context.find_symbol container, method
+    elsif /([A-Za-z]\w*)[.\#](\w+(\([\.\w+\*\/\+\-\=\<\>]+\))?)/ =~ lookup then
+      container = $1
+      method = $2
+      ref = @context.find_symbol container, method
+    else
+      ref = @context.find_symbol lookup
+    end
+
+    out = if lookup =~ /^\\/ then
+            $'
+          elsif ref and ref.document_self then
+            "<a href=\"#{ref.as_href(@from_path)}\">#{name}</a>"
+          else
+            name
+          end
+
+    @seen[name] = out
+
+    out
+  end
+
+end
+