Class: LL::Lexer

Inherits:
Object
  • Object
show all
Defined in:
lib/ll/lexer.rb

Overview

Ragel lexer for LL grammar files.

Class Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data, file = SourceLine::DEFAULT_FILE) ⇒ Lexer

Returns a new instance of Lexer.

Parameters:

  • data (String) —

    The data to lex.

  • file (String) (defaults to: SourceLine::DEFAULT_FILE) —

    The name of the input file.



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# File 'lib/ll/lexer.rb', line 202

def initialize(data, file = SourceLine::DEFAULT_FILE)
  @data = data
  @file = file

  reset
end

Class Attribute Details

._ll_lexer_eof_trans ⇒ Object

Returns the value of attribute _ll_lexer_eof_trans.



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# File 'lib/ll/lexer.rb', line 161

def _ll_lexer_eof_trans
  @_ll_lexer_eof_trans
end

._ll_lexer_from_state_actions ⇒ Object

Returns the value of attribute _ll_lexer_from_state_actions.



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# File 'lib/ll/lexer.rb', line 150

def _ll_lexer_from_state_actions
  @_ll_lexer_from_state_actions
end

._ll_lexer_index_offsets ⇒ Object

Returns the value of attribute _ll_lexer_index_offsets.



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# File 'lib/ll/lexer.rb', line 41

def _ll_lexer_index_offsets
  @_ll_lexer_index_offsets
end

._ll_lexer_indicies ⇒ Object

Returns the value of attribute _ll_lexer_indicies.



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# File 'lib/ll/lexer.rb', line 52

def _ll_lexer_indicies
  @_ll_lexer_indicies
end

._ll_lexer_key_spans ⇒ Object

Returns the value of attribute _ll_lexer_key_spans.



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# File 'lib/ll/lexer.rb', line 30

def _ll_lexer_key_spans
  @_ll_lexer_key_spans
end

._ll_lexer_to_state_actions ⇒ Object

Returns the value of attribute _ll_lexer_to_state_actions.



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# File 'lib/ll/lexer.rb', line 139

def _ll_lexer_to_state_actions
  @_ll_lexer_to_state_actions
end

._ll_lexer_trans_actions ⇒ Object

Returns the value of attribute _ll_lexer_trans_actions.



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# File 'lib/ll/lexer.rb', line 126

def _ll_lexer_trans_actions
  @_ll_lexer_trans_actions
end

._ll_lexer_trans_keys ⇒ Object

Returns the value of attribute _ll_lexer_trans_keys.



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# File 'lib/ll/lexer.rb', line 13

def _ll_lexer_trans_keys
  @_ll_lexer_trans_keys
end

._ll_lexer_trans_targs ⇒ Object

Returns the value of attribute _ll_lexer_trans_targs.



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# File 'lib/ll/lexer.rb', line 113

def _ll_lexer_trans_targs
  @_ll_lexer_trans_targs
end

.ll_lexer_en_main ⇒ Object

Returns the value of attribute ll_lexer_en_main.



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# File 'lib/ll/lexer.rb', line 189

def ll_lexer_en_main
  @ll_lexer_en_main
end

.ll_lexer_en_ruby_body ⇒ Object

Returns the value of attribute ll_lexer_en_ruby_body.



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# File 'lib/ll/lexer.rb', line 185

def ll_lexer_en_ruby_body
  @ll_lexer_en_ruby_body
end

.ll_lexer_error ⇒ Object

Returns the value of attribute ll_lexer_error.



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# File 'lib/ll/lexer.rb', line 180

def ll_lexer_error
  @ll_lexer_error
end

.ll_lexer_first_final ⇒ Object

Returns the value of attribute ll_lexer_first_final.



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# File 'lib/ll/lexer.rb', line 176

def ll_lexer_first_final
  @ll_lexer_first_final
end

.ll_lexer_start ⇒ Object

Returns the value of attribute ll_lexer_start.



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# File 'lib/ll/lexer.rb', line 172

def ll_lexer_start
  @ll_lexer_start
end

Instance Method Details

#add_token(type, value, line = @line) {|token| ... } ⇒ Object (private)

Yields a new token to the supplied block.

Parameters:

  • type (Symbol) —

    The token type.

  • value (String) —

    The token value.

  • line (Fixnum) (defaults to: @line)

Yield Parameters:



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# File 'lib/ll/lexer.rb', line 593

def add_token(type, value, line = @line)
  source_line = SourceLine.new(@data, line, @column, @file)
  @column    += value.length

  @block.call(Token.new(type, value, source_line))
end

#advance(&block) ⇒ Object

Advances through the input and generates the corresponding tokens. Each token is yielded to the supplied block.

See Also:

  • LL::Lexer.[[#add_token]


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# File 'lib/ll/lexer.rb', line 240

def advance(&block)
  @block = block

  data = @data # saves ivar lookups while lexing.
  ts   = nil
  te   = nil
  cs   = self.class.ll_lexer_start
  act  = 0
  eof  = @data.bytesize
  p    = 0
  pe   = eof

  mark        = 0
  brace_count = 0
  start_line  = 0

  _ll_lexer_eof_trans          = self.class.send(:_ll_lexer_eof_trans)
  _ll_lexer_from_state_actions = self.class.send(:_ll_lexer_from_state_actions)
  _ll_lexer_index_offsets      = self.class.send(:_ll_lexer_index_offsets)
  _ll_lexer_indicies           = self.class.send(:_ll_lexer_indicies)
  _ll_lexer_key_spans          = self.class.send(:_ll_lexer_key_spans)
  _ll_lexer_to_state_actions   = self.class.send(:_ll_lexer_to_state_actions)
  _ll_lexer_trans_actions      = self.class.send(:_ll_lexer_trans_actions)
  _ll_lexer_trans_keys         = self.class.send(:_ll_lexer_trans_keys)
  _ll_lexer_trans_targs        = self.class.send(:_ll_lexer_trans_targs)

  
# line 268 "lib/ll/lexer.rb"
begin
	testEof = false
	_slen, _trans, _keys, _inds, _acts, _nacts = nil
	_goto_level = 0
	_resume = 10
	_eof_trans = 15
	_again = 20
	_test_eof = 30
	_out = 40
	while true
	if _goto_level <= 0
	if p == pe
		_goto_level = _test_eof
		next
	end
	if cs == 0
		_goto_level = _out
		next
	end
	end
	if _goto_level <= _resume
	case _ll_lexer_from_state_actions[cs] 
	when 6 then
# line 1 "NONE"
		begin
ts = p
		end
# line 296 "lib/ll/lexer.rb"
	end
	_keys = cs << 1
	_inds = _ll_lexer_index_offsets[cs]
	_slen = _ll_lexer_key_spans[cs]
	_wide = ( _wide)
	_wide = (data.getbyte(p) || 0)
  _trans = if (   _slen > 0 && 
			_ll_lexer_trans_keys[_keys] <= _wide && 
			_wide <= _ll_lexer_trans_keys[_keys + 1] 
  ) then
			_ll_lexer_indicies[ _inds + _wide - _ll_lexer_trans_keys[_keys] ] 
		 else 
			_ll_lexer_indicies[ _inds + _slen ]
		 end
	end
	if _goto_level <= _eof_trans
	cs = _ll_lexer_trans_targs[_trans]
	if _ll_lexer_trans_actions[_trans] != 0
	case _ll_lexer_trans_actions[_trans]
	when 25 then
# line 188 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  brace_count += 1  end
		end
	when 26 then
# line 190 "lib/ll/lexer.rl"
		begin
te = p+1
 begin 
      if brace_count == 1
        emit(:T_RUBY, mark, ts, start_line)

        mark        = 0
        brace_count = 0
        start_line  = 0

        advance_column

        cs = 22;
      else
        brace_count -= 1
      end
     end
		end
	when 23 then
# line 206 "lib/ll/lexer.rl"
		begin
te = p+1
		end
	when 3 then
# line 215 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  emit(:T_NAME, ts, te)  end
		end
	when 4 then
# line 216 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  emit(:T_TERMINALS, ts, te)  end
		end
	when 2 then
# line 217 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  emit(:T_INNER, ts, te)  end
		end
	when 1 then
# line 218 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  emit(:T_HEADER, ts, te)  end
		end
	when 16 then
# line 220 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  emit(:T_EQUALS, ts, te)  end
		end
	when 14 then
# line 221 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  emit(:T_COLON, ts, te)  end
		end
	when 15 then
# line 222 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  emit(:T_SEMICOLON, ts, te)  end
		end
	when 20 then
# line 223 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  emit(:T_PIPE, ts, te)  end
		end
	when 13 then
# line 225 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  emit(:T_PLUS, ts, te)  end
		end
	when 12 then
# line 226 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  emit(:T_STAR, ts, te)  end
		end
	when 17 then
# line 227 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  emit(:T_QUESTION, ts, te)  end
		end
	when 10 then
# line 228 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  emit(:T_LPAREN, ts, te)  end
		end
	when 11 then
# line 229 "lib/ll/lexer.rl"
		begin
te = p+1
 begin  emit(:T_RPAREN, ts, te)  end
		end
	when 19 then
# line 231 "lib/ll/lexer.rl"
		begin
te = p+1
 begin 
      mark        = ts + 1
      brace_count = 1
      start_line  = @line

      advance_column

      cs = 25;
     end
		end
	when 22 then
# line 213 "lib/ll/lexer.rl"
		begin
te = p
p = p - 1;		end
	when 21 then
# line 1 "NONE"
		begin
	case act
	when 16 then
	begin begin p = ((te))-1; end
 emit(:T_EPSILON, ts, te) end
	when 23 then
	begin begin p = ((te))-1; end

    emit(:T_IDENT, ts, te)
  end
end 
			end
	when 24 then
# line 148 "lib/ll/lexer.rl"
		begin

    advance_line

    @column = 1
  		end
# line 186 "lib/ll/lexer.rl"
		begin
te = p+1
		end
	when 9 then
# line 148 "lib/ll/lexer.rl"
		begin

    advance_line

    @column = 1
  		end
# line 210 "lib/ll/lexer.rl"
		begin
te = p+1
		end
	when 8 then
# line 154 "lib/ll/lexer.rl"
		begin

    advance_column
  		end
# line 211 "lib/ll/lexer.rl"
		begin
te = p+1
		end
	when 18 then
# line 1 "NONE"
		begin
te = p+1
		end
# line 224 "lib/ll/lexer.rl"
		begin
act = 16;		end
	when 7 then
# line 1 "NONE"
		begin
te = p+1
		end
# line 168 "lib/ll/lexer.rl"
		begin
act = 23;		end
# line 507 "lib/ll/lexer.rb"
	end
	end
	end
	if _goto_level <= _again
	case _ll_lexer_to_state_actions[cs] 
	when 5 then
# line 1 "NONE"
		begin
ts = nil;		end
# line 517 "lib/ll/lexer.rb"
	end

	if cs == 0
		_goto_level = _out
		next
	end
	p += 1
	if p != pe
		_goto_level = _resume
		next
	end
	end
	if _goto_level <= _test_eof
	if p == eof
	if _ll_lexer_eof_trans[cs] > 0
		_trans = _ll_lexer_eof_trans[cs] - 1;
		_goto_level = _eof_trans
		next;
	end
	end

	end
	if _goto_level <= _out
		break
	end
end
	end

# line 81 "lib/ll/lexer.rl"

  # % fix highlight
ensure
  reset
end

#advance_column ⇒ Object (private) 



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# File 'lib/ll/lexer.rb', line 604

def advance_column
  @column += 1
end

#advance_line ⇒ Object (private) 



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# File 'lib/ll/lexer.rb', line 600

def advance_line
  @line += 1
end

#emit(type, start, stop, line = @line) ⇒ Object (private)

Emits a token of which the value is based on the supplied start/stop position.

Parameters:

  • type (Symbol) —

    The token type.

  • start (Fixnum)
  • stop (Fixnum)
  • line (Fixnum) (defaults to: @line)

See Also:

  • LL::Lexer.[[#text]
  • LL::Lexer.[[#add_token]


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# File 'lib/ll/lexer.rb', line 567

def emit(type, start, stop, line = @line)
  value = slice_input(start, stop)

  add_token(type, value, line)
end

#lex ⇒ Array

Gathers all the tokens for the input and returns them as an Array.

Returns:

  • (Array)

See Also:

  • LL::Lexer.[[#advance]


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# File 'lib/ll/lexer.rb', line 215

def lex
  tokens = []

  advance do |token|
    tokens << token
  end

  return tokens
end

#reset ⇒ Object

Resets the internal state of the lexer.



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# File 'lib/ll/lexer.rb', line 228

def reset
  @block  = nil
  @line   = 1
  @column = 1
end

#slice_input(start, stop) ⇒ String (private)

Returns the text between the specified start and stop position.

Parameters:

  • start (Fixnum)
  • stop (Fixnum)

Returns:

  • (String) 


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# File 'lib/ll/lexer.rb', line 580

def slice_input(start, stop)
  return @data.byteslice(start, stop - start)
end