RDoc::Parser::

RubyTools

module

Collection of methods for writing parsers against RDoc::RubyLex and RDoc::RubyToken

Public Instance Methods

add_token_listener(obj)

Adds a token listener obj, but you should probably use #token_listener

# File lib/rdoc/parser/ruby_tools.rb, line 12
def add_token_listener(obj)
  @token_listeners ||= []
  @token_listeners << obj
end
get_tk()

Fetches the next token from the scanner

# File lib/rdoc/parser/ruby_tools.rb, line 20
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
      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
get_tk_until(*tokens)

Reads and returns all tokens up to one of tokens. Leaves the matched token in the token list.

# File lib/rdoc/parser/ruby_tools.rb, line 68
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
get_tkread()

Retrieves a String representation of the read tokens

# File lib/rdoc/parser/ruby_tools.rb, line 83
def get_tkread
  read = @read.join("")
  @read = []
  read
end
peek_read()

Peek equivalent for #get_tkread

# File lib/rdoc/parser/ruby_tools.rb, line 92
def peek_read
  @read.join('')
end
peek_tk()

Peek at the next token, but don’t remove it from the stream

# File lib/rdoc/parser/ruby_tools.rb, line 99
def peek_tk
  unget_tk(tk = get_tk)
  tk
end
remove_token_listener(obj)

Removes the token listener obj

# File lib/rdoc/parser/ruby_tools.rb, line 107
def remove_token_listener(obj)
  @token_listeners.delete(obj)
end
reset()

Resets the tools

# File lib/rdoc/parser/ruby_tools.rb, line 114
def reset
  @read       = []
  @tokens     = []
  @unget_read = []
  @nest = 0
end
skip_tkspace(skip_nl = true)

Skips whitespace tokens including newlines if skip_nl is true

# File lib/rdoc/parser/ruby_tools.rb, line 124
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
token_listener(obj) { || ... }

Has obj listen to tokens

# File lib/rdoc/parser/ruby_tools.rb, line 138
def token_listener(obj)
  add_token_listener obj
  yield
ensure
  remove_token_listener obj
end
unget_tk(tk)

Returns tk to the scanner

# File lib/rdoc/parser/ruby_tools.rb, line 148
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

  nil
end