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Class: ActionDispatch::Journey::Parser

Do not use. This class is for internal use only.
Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
self, Nodes
Inherits: Object
Defined in: actionpack/lib/action_dispatch/journey/parser.rb

Class Method Summary

Instance Method Summary

Constructor Details

.new ⇒ Parser

[ GitHub ] 

  


# File 'actionpack/lib/action_dispatch/journey/parser.rb', line 15



def initialize
  @scanner = Scanner.new
  @next_token = nil
end


  







Class Method Details



  

    .parse(string)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/journey/parser.rb', line 11



def self.parse(string)
  new.parse string
end


  







Instance Method Details



  

    #advance_token   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/journey/parser.rb', line 27



def advance_token
  @next_token = @scanner.next_token
end


  








  

    #do_parse   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/journey/parser.rb', line 31



def do_parse
  parse_expressions
end


  








  

    #parse(string)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/journey/parser.rb', line 20



def parse(string)
  @scanner.scan_setup(string)
  advance_token
  do_parse
end


  








  

    #parse_expression   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/journey/parser.rb', line 58



def parse_expression
  if @next_token == :STAR
    parse_star
  elsif @next_token == :LPAREN
    parse_group
  else
    parse_terminal
  end
end


  








  

    #parse_expressions   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/journey/parser.rb', line 35



def parse_expressions
  node = parse_expression

  while @next_token
    case @next_token
    when :RPAREN
      break
    when :OR
      node = parse_or(node)
    else
      node = Cat.new(node, parse_expressions)
    end
  end

  node
end


  








  

    #parse_group   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/journey/parser.rb', line 74



def parse_group
  advance_token
  node = parse_expressions
  if @next_token == :RPAREN
    node = Group.new(node)
    advance_token
    node
  else
    raise ArgumentError, "missing right parenthesis."
  end
end


  








  

    #parse_or(lhs)   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/journey/parser.rb', line 52



def parse_or(lhs)
  advance_token
  node = parse_expression
  Or.new([lhs, node])
end


  








  

    #parse_star   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/journey/parser.rb', line 68



def parse_star
  node = Star.new(Symbol.new(@scanner.last_string, Symbol::GREEDY_EXP))
  advance_token
  node
end


  








  

    #parse_terminal   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/journey/parser.rb', line 86



def parse_terminal
  node = case @next_token
  when :SYMBOL
    Symbol.new(@scanner.last_string)
  when :LITERAL
    Literal.new(@scanner.last_literal)
  when :SLASH
    Slash.new("/")
  when :DOT
    Dot.new(".")
  end

  advance_token
  node
end