* lib/rdoc: Update to RDoc 3.9. Fixed `ri []`, stopdoc creating an

	  object reference, nodoc for class aliases, verbatim === lines.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32767 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 173 insertions, 0 deletions

diff --git a/lib/rdoc/cross_reference.rb b/lib/rdoc/cross_reference.rb
new file mode 100644
index 0000000000..adeef2661a
--- /dev/null
+++ b/lib/rdoc/cross_reference.rb
@@ -0,0 +1,173 @@
+##
+# RDoc::CrossReference is a reusable way to create cross references for names.
+
+class RDoc::CrossReference
+
+  ##
+  # 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)
+
+  CLASS_REGEXP_STR = '\\\\?((?:\:{2})?[A-Z]\w*(?:\:\:\w+)*)'
+
+  ##
+  # Regular expression to match method references.
+  #
+  # See CLASS_REGEXP_STR
+
+  METHOD_REGEXP_STR = '([a-z]\w*[!?=]?)(?:\([\w.+*/=<>-]*\))?'
+
+  ##
+  # Regular expressions matching text that should potentially have
+  # cross-reference links generated are passed to add_special.  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.
+
+  CROSSREF_REGEXP = /(
+                      # A::B::C.meth
+                      #{CLASS_REGEXP_STR}(?:[.#]|::)#{METHOD_REGEXP_STR}
+
+                      # Stand-alone method (preceded by a #)
+                      | \\?\##{METHOD_REGEXP_STR}
+
+                      # Stand-alone method (preceded by ::)
+                      | ::#{METHOD_REGEXP_STR}
+
+                      # A::B::C
+                      # The stuff after CLASS_REGEXP_STR is a
+                      # nasty hack.  CLASS_REGEXP_STR unfortunately matches
+                      # words like dog and cat (these are legal "class"
+                      # names in Fortran 95).  When a word is flagged as a
+                      # potential cross-reference, limitations in the markup
+                      # engine suppress other processing, such as typesetting.
+                      # This is particularly noticeable for contractions.
+                      # In order that words like "can't" not
+                      # be flagged as potential cross-references, only
+                      # flag potential class cross-references if the character
+                      # after the cross-reference is a space, sentence
+                      # punctuation, tag start character, or attribute
+                      # marker.
+                      | #{CLASS_REGEXP_STR}(?=[\s\)\.\?\!\,\;<\000]|\z)
+
+                      # Things that look like filenames
+                      # The key thing is that there must be at least
+                      # one special character (period, slash, or
+                      # underscore).
+                      | (?:\.\.\/)*[-\/\w]+[_\/\.][-\w\/\.]+
+
+                      # Things that have markup suppressed
+                      # Don't process things like '\<' in \<tt>, though.
+                      # TODO: including < is a hack, not very satisfying.
+                      | \\[^\s<]
+                      )/x
+
+  ##
+  # Version of CROSSREF_REGEXP used when <tt>--hyperlink-all</tt> is specified.
+
+  ALL_CROSSREF_REGEXP = /(
+                      # A::B::C.meth
+                      #{CLASS_REGEXP_STR}(?:[.#]|::)#{METHOD_REGEXP_STR}
+
+                      # Stand-alone method
+                      | \\?#{METHOD_REGEXP_STR}
+
+                      # A::B::C
+                      | #{CLASS_REGEXP_STR}(?=[\s\)\.\?\!\,\;<\000]|\z)
+
+                      # Things that look like filenames
+                      | (?:\.\.\/)*[-\/\w]+[_\/\.][-\w\/\.]+
+
+                      # Things that have markup suppressed
+                      | \\[^\s<]
+                      )/x
+
+  attr_accessor :seen
+
+  ##
+  # Allows cross-references to be created based on the given +context+
+  # (RDoc::Context).
+
+  def initialize context
+    @context = context
+
+    @seen = {}
+  end
+
+  ##
+  # 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.
+
+  def resolve name, text
+    return @seen[name] if @seen.include? name
+
+    # 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 /#{CLASS_REGEXP_STR}([.#]|::)#{METHOD_REGEXP_STR}/o =~ name then
+      type = $2
+      type = '' if type == '.'  # will find either #method or ::method
+      method = "#{type}#{$3}"
+      container = @context.find_symbol_module($1)
+    elsif /^([.#]|::)#{METHOD_REGEXP_STR}/o =~ name then
+      type = $1
+      type = '' if type == '.'
+      method = "#{type}#{$2}"
+      container = @context
+    else
+      container = nil
+    end
+
+    if container then
+      ref = container.find_local_symbol method
+
+      unless ref || RDoc::TopLevel === container then
+        ref = container.find_ancestor_local_symbol method
+      end
+    end
+
+    ref = case name
+          when /^\\(#{CLASS_REGEXP_STR})$/o then
+            ref = @context.find_symbol $1
+          else
+            ref = @context.find_symbol name
+          end unless ref
+
+    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
+
+end
+