# module RDoc::Parser::RubyTools

Collection of methods for writing parsers

### Public Instance Methods

add_token_listener (obj)
Source

    # File lib/rdoc/parser/ruby_tools.rb, line 10
    def add_token_listener(obj)
      @token_listeners ||= []
      @token_listeners << obj
    end

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

get_tk ()
Source

    # File lib/rdoc/parser/ruby_tools.rb, line 18
    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

Fetches the next token from the scanner

get_tk_until (*tokens)
Source

    # File lib/rdoc/parser/ruby_tools.rb, line 52
    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

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

get_tkread ()
Source

    # File lib/rdoc/parser/ruby_tools.rb, line 73
    def get_tkread
      read = @read.join("")
      @read = []
      read
    end

Retrieves a `String` representation of the read tokens

peek_read ()
Source

    # File lib/rdoc/parser/ruby_tools.rb, line 82
    def peek_read
      @read.join('')
    end

Peek equivalent for `get_tkread`

peek_tk ()
Source

    # File lib/rdoc/parser/ruby_tools.rb, line 89
    def peek_tk
      unget_tk(tk = get_tk)
      tk
    end

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

remove_token_listener (obj)
Source

    # File lib/rdoc/parser/ruby_tools.rb, line 97
    def remove_token_listener(obj)
      @token_listeners.delete(obj)
    end

Removes the token listener `obj`

reset ()
Source

    # File lib/rdoc/parser/ruby_tools.rb, line 104
    def reset
      @read       = []
      @tokens     = []
      @unget_read = []
      @nest = 0
      @scanner_point = 0
    end

Resets the tools

skip_tkspace ()
Source

    # File lib/rdoc/parser/ruby_tools.rb, line 115
    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

Skips whitespace tokens including newlines

skip_tkspace_without_nl ()
Source

    # File lib/rdoc/parser/ruby_tools.rb, line 129
    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

Skips whitespace tokens excluding newlines

token_listener (obj) { || ... }
Source

    # File lib/rdoc/parser/ruby_tools.rb, line 143
    def token_listener(obj)
      add_token_listener obj
      yield
    ensure
      remove_token_listener obj
    end

Has `obj` listen to tokens

unget_tk (tk)
Source

    # File lib/rdoc/parser/ruby_tools.rb, line 153
    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

Returns `tk` to the scanner