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Class: Gem::RequestSet::Lockfile::Tokenizer

Relationships & Source Files
Namespace Children
Classes:
Token
Inherits: Object
Defined in: lib/rubygems/request_set/lockfile/tokenizer.rb

Constant Summary

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(input, filename = nil, line = 0, pos = 0) ⇒ Tokenizer

[ GitHub ] 

  


# File 'lib/rubygems/request_set/lockfile/tokenizer.rb', line 12



def initialize(input, filename = nil, line = 0, pos = 0)
  @line     = line
  @line_pos = pos
  @tokens   = []
  @filename = filename
  tokenize input
end


  







Class Method Details



  

    .from_file(file)  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/request_set/lockfile/tokenizer.rb', line 8



def self.from_file(file)
  new File.read(file), file
end


  







Instance Attribute Details



  

    #empty?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/rubygems/request_set/lockfile/tokenizer.rb', line 40



def empty?
  @tokens.empty?
end


  







Instance Method Details



  

    #make_parser(set, platforms)  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/request_set/lockfile/tokenizer.rb', line 20



def make_parser(set, platforms)
  Gem::RequestSet::Lockfile::Parser.new self, set, platforms, @filename
end


  








  

    #next_token  
    Also known as: #shift
  

  [ GitHub ]


  

  


# File 'lib/rubygems/request_set/lockfile/tokenizer.rb', line 48



def next_token
  @tokens.shift
end


  








  

    #peek  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/request_set/lockfile/tokenizer.rb', line 53



def peek
  @tokens.first || EOF
end


  








  

    #shift  
  



  

    

Alias for #next_token.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/request_set/lockfile/tokenizer.rb', line 51



alias :shift :next_token


  








  

    #skip(type)  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/request_set/lockfile/tokenizer.rb', line 28



def skip(type)
  @tokens.shift while not @tokens.empty? and peek.type == type
end


  








  

    #to_a  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/request_set/lockfile/tokenizer.rb', line 24



def to_a
  @tokens.map {|token| [token.type, token.value, token.column, token.line] }
end


  








  

    #token_pos(byte_offset)  
  

  

    This method is for internal use only.
  



  

    

Calculates the column (by byte) and the line of the current token based on byte_offset.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/request_set/lockfile/tokenizer.rb', line 36



def token_pos(byte_offset) # :nodoc:
  [byte_offset - @line_pos, @line]
end


  








  

    #tokenize(input)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubygems/request_set/lockfile/tokenizer.rb', line 59



def tokenize(input)
  require 'strscan'
  s = StringScanner.new input

  until s.eos? do
    pos = s.pos

    pos = s.pos if leading_whitespace = s.scan(/ +/)

    if s.scan(/[<|=>]{7}/)
      message = "your #{@filename} contains merge conflict markers"
      column, line = token_pos pos

      raise Gem::RequestSet::Lockfile::ParseError.new message, column, line, @filename
    end

    @tokens <<
      case
      when s.scan(/\r?\n/) then
        token = Token.new(:newline, nil, *token_pos(pos))
        @line_pos = s.pos
        @line += 1
        token
      when s.scan(/[A-Z]+/) then
        if leading_whitespace
          text = s.matched
          text += s.scan(/[^\s)]*/).to_s # in case of no match
          Token.new(:text, text, *token_pos(pos))
        else
          Token.new(:section, s.matched, *token_pos(pos))
        end
      when s.scan(/([a-z]+):\s/) then
        s.pos -= 1 # rewind for possible newline
        Token.new(:entry, s[1], *token_pos(pos))
      when s.scan(/\(/) then
        Token.new(:l_paren, nil, *token_pos(pos))
      when s.scan(/\)/) then
        Token.new(:r_paren, nil, *token_pos(pos))
      when s.scan(/<=|>=|=|~>|<|>|!=/) then
        Token.new(:requirement, s.matched, *token_pos(pos))
      when s.scan(/,/) then
        Token.new(:comma, nil, *token_pos(pos))
      when s.scan(/!/) then
        Token.new(:bang, nil, *token_pos(pos))
      when s.scan(/[^\s),!]*/) then
        Token.new(:text, s.matched, *token_pos(pos))
      else
        raise "BUG: can't create token for: #{s.string[s.pos..-1].inspect}"
      end
  end

  @tokens
end


  








  

    #unshift(token)  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/request_set/lockfile/tokenizer.rb', line 44



def unshift(token)
  @tokens.unshift token
end