Import RDoc 2.5

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27147 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rdoc/parser/ruby_tools.rb

@@ -0,0 +1,157 @@
+##
+# Collection of methods for writing parsers against RDoc::RubyLex and
+# RDoc::RubyToken
+
+module RDoc::Parser::RubyTools
+
+  include RDoc::RubyToken
+
+  ##
+  # Adds a token listener +obj+, but you should probably use token_listener
+
+  def add_token_listener(obj)
+    @token_listeners ||= []
+    @token_listeners << obj
+  end
+
+  ##
+  # Fetches the next token from the scanner
+
+  def get_tk
+    tk = nil
+
+    if @tokens.empty? then
+      tk = @scanner.token
+      @read.push @scanner.get_readed
+      puts "get_tk1 => #{tk.inspect}" if $TOKEN_DEBUG
+    else
+      @read.push @unget_read.shift
+      tk = @tokens.shift
+      puts "get_tk2 => #{tk.inspect}" if $TOKEN_DEBUG
+    end
+
+    tk = nil if TkEND_OF_SCRIPT === tk
+
+    if TkSYMBEG === tk then
+      set_token_position tk.line_no, tk.char_no
+
+      case tk1 = get_tk
+      when TkId, TkOp, TkSTRING, TkDSTRING, TkSTAR, TkAMPER then
+        if tk1.respond_to?(:name) then
+          tk = Token(TkSYMBOL).set_text(":" + tk1.name)
+        else
+          tk = Token(TkSYMBOL).set_text(":" + tk1.text)
+        end
+
+        # remove the identifier we just read (we're about to replace it with a
+        # symbol)
+        @token_listeners.each do |obj|
+          obj.pop_token
+        end if @token_listeners
+      else
+        warn("':' not followed by identifier or operator")
+        tk = tk1
+      end
+    end
+
+    # inform any listeners of our shiny new token
+    @token_listeners.each do |obj|
+      obj.add_token(tk)
+    end if @token_listeners
+
+    tk
+  end
+
+  def get_tk_until(*tokens)
+    read = []
+
+    loop do
+      tk = get_tk
+      case tk when *tokens then unget_tk tk; break end
+      read << tk
+    end
+
+    read
+  end
+
+  ##
+  # Retrieves a String representation of the read tokens
+
+  def get_tkread
+    read = @read.join("")
+    @read = []
+    read
+  end
+
+  ##
+  # Peek equivalent for get_tkread
+
+  def peek_read
+    @read.join('')
+  end
+
+  ##
+  # Peek at the next token, but don't remove it from the stream
+
+  def peek_tk
+    unget_tk(tk = get_tk)
+    tk
+  end
+
+  ##
+  # Removes the token listener +obj+
+
+  def remove_token_listener(obj)
+    @token_listeners.delete(obj)
+  end
+
+  ##
+  # Resets the tools
+
+  def reset
+    @read       = []
+    @tokens     = []
+    @unget_read = []
+    @nest = 0
+  end
+
+  ##
+  # Skips whitespace tokens including newlines if +skip_nl+ is true
+
+  def skip_tkspace(skip_nl = true) # HACK dup
+    tokens = []
+
+    while TkSPACE === (tk = get_tk) or (skip_nl and TkNL === tk) do
+      tokens.push tk
+    end
+
+    unget_tk tk
+    tokens
+  end
+
+  ##
+  # Has +obj+ listen to tokens
+
+  def token_listener(obj)
+    add_token_listener obj
+    yield
+  ensure
+    remove_token_listener obj
+  end
+
+  ##
+  # Returns +tk+ to the scanner
+
+  def unget_tk(tk)
+    @tokens.unshift tk
+    @unget_read.unshift @read.pop
+
+    # Remove this token from any listeners
+    @token_listeners.each do |obj|
+      obj.pop_token
+    end if @token_listeners
+  end
+
+end
+
+