1 files changed, 102 insertions, 0 deletions
diff --git a/trunk/lib/rdoc/markup/to_html_crossref.rb b/trunk/lib/rdoc/markup/to_html_crossref.rb
new file mode 100644
index 0000000000..a6f29c5c2c
--- /dev/null
+++ b/trunk/lib/rdoc/markup/to_html_crossref.rb
@@ -0,0 +1,102 @@
+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)
+    raise ArgumentError, 'from_path cannot be nil' if from_path.nil?
+    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 name if name =~ /\A[a-z]*\z/
+
+    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.
+    #
+    # Do not, however, use an if/elsif/else chain to do so.  Instead, test
+    # each possible pattern until one matches.  The reason for this is that a
+    # string like "YAML.txt" could be the txt() class method of class YAML (in
+    # which case it would match the first pattern, which splits the string
+    # into container and method components and looks up both) or a filename
+    # (in which case it would match the last pattern, which just checks
+    # whether the string as a whole is a known symbol).
+
+    if /([A-Z][\w:]*)[.\#](\w+[!?=]?)/ =~ lookup then
+      container = $1
+      method = $2
+      ref = @context.find_symbol container, method
+    end
+
+    if !ref and
+       /([A-Za-z][\w:]*)[.\#](\w+(\([\.\w+\*\/\+\-\=\<\>]+\))?)/ =~ lookup then
+      container = $1
+      method = $2
+      ref = @context.find_symbol container, method
+    end
+
+    ref = @context.find_symbol lookup unless ref
+
+    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
+