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  • rdoc/parser/ruby_tools.rb

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RDoc::Parser::RubyTools

Collection of methods for writing parsers

Public Instance Methods

add_token_listener(obj) click to toggle source

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

 
               # File rdoc/parser/ruby_tools.rb, line 9
def add_token_listener(obj)
  @token_listeners ||= []
  @token_listeners << obj
end
            
get_tk() click to toggle source

Fetches the next token from the scanner

 
               # File rdoc/parser/ruby_tools.rb, line 17
def get_tk
  tk = nil

  if @tokens.empty? then
    if @scanner_point >= @scanner.size
      return nil
    else
      tk = @scanner[@scanner_point]
      @scanner_point += 1
      @read.push tk[:text]
    end
  else
    @read.push @unget_read.shift
    tk = @tokens.shift
  end

  if tk == nil || :on___end__ == tk[:kind]
    tk = nil
  end

  return nil unless tk

  # 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) click to toggle source

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

 
               # File rdoc/parser/ruby_tools.rb, line 51
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() click to toggle source

Retrieves a String representation of the read tokens

 
               # File rdoc/parser/ruby_tools.rb, line 72
def get_tkread
  read = @read.join("")
  @read = []
  read
end
            
peek_read() click to toggle source

Peek equivalent for #get_tkread

 
               # File rdoc/parser/ruby_tools.rb, line 81
def peek_read
  @read.join('')
end
            
peek_tk() click to toggle source

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

 
               # File rdoc/parser/ruby_tools.rb, line 88
def peek_tk
  unget_tk(tk = get_tk)
  tk
end
            
remove_token_listener(obj) click to toggle source

Removes the token listener obj

 
               # File rdoc/parser/ruby_tools.rb, line 96
def remove_token_listener(obj)
  @token_listeners.delete(obj)
end
            
reset() click to toggle source

Resets the tools

 
               # File rdoc/parser/ruby_tools.rb, line 103
def reset
  @read       = []
  @tokens     = []
  @unget_read = []
  @nest = 0
  @scanner_point = 0
end
            
skip_tkspace() click to toggle source

Skips whitespace tokens including newlines

 
               # File rdoc/parser/ruby_tools.rb, line 114
def skip_tkspace
  tokens = []

  while (tk = get_tk) and (:on_sp == tk[:kind] or :on_nl == tk[:kind] or :on_ignored_nl == tk[:kind]) do
    tokens.push(tk)
  end

  unget_tk(tk)
  tokens
end
            
skip_tkspace_without_nl() click to toggle source

Skips whitespace tokens excluding newlines

 
               # File rdoc/parser/ruby_tools.rb, line 128
def skip_tkspace_without_nl
  tokens = []

  while (tk = get_tk) and :on_sp == tk[:kind] do
    tokens.push(tk)
  end

  unget_tk(tk)
  tokens
end
            
token_listener(obj) click to toggle source

Has obj listen to tokens

 
               # File rdoc/parser/ruby_tools.rb, line 142
def token_listener(obj)
  add_token_listener obj
  yield
ensure
  remove_token_listener obj
end
            
unget_tk(tk) click to toggle source

Returns tk to the scanner

 
               # File rdoc/parser/ruby_tools.rb, line 152
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