Class: Einstein::Parser

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/einstein/parser.rex.rb,
lib/einstein/parser.racc.rb

Defined Under Namespace

Classes: ScanError

Constant Summary collapse

Racc_arg = 
[
racc_action_table,
racc_action_check,
racc_action_default,
racc_action_pointer,
racc_goto_table,
racc_goto_check,
racc_goto_default,
racc_goto_pointer,
racc_nt_base,
racc_reduce_table,
racc_token_table,
racc_shift_n,
racc_reduce_n,
racc_use_result_var ]
Racc_token_to_s_table = 
[
'$end',
'error',
'IDENT',
'NUMBER',
'"("',
'")"',
'"+"',
'"-"',
'"~"',
'MULT2',
'"*"',
'"/"',
'"%"',
'LSHIFT',
'RSHIFT',
'"&"',
'"|"',
'"^"',
'$start',
'exp',
'bitwise_or',
'literal',
'primary',
'unary',
'exponent',
'multiplicative',
'additive',
'shift',
'bitwise_and']
Racc_debug_parser = 
false

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/einstein/parser.rex.rb', line 15

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/einstein/parser.rex.rb', line 14

def lineno
  @lineno
end

Instance Method Details

#_reduce_none(val, _values, result) ⇒ Object 



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# File 'lib/einstein/parser.racc.rb', line 327

def _reduce_none( val, _values, result )
 result
end

#action(&block) ⇒ Object 



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# File 'lib/einstein/parser.rex.rb', line 19

def action &block
  yield
end

#load_file(filename) ⇒ Object 



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# File 'lib/einstein/parser.rex.rb', line 28

def load_file( filename )
  @filename = filename
  open(filename, "r") do |f|
    scan_evaluate  f.read
  end
end

#next_token ⇒ Object 



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# File 'lib/einstein/parser.rex.rb', line 40

def next_token
  @rex_tokens.shift
end

#scan_evaluate(str) ⇒ Object 



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# File 'lib/einstein/parser.rex.rb', line 44

def scan_evaluate( str )
  scan_setup
  @rex_tokens = []
  @lineno  =  1
  ss = StringScanner.new(str)
  state = nil
  until ss.eos?
    text = ss.peek(1)
    @lineno  +=  1  if text == "\n"
    case state
    when nil
      case
      when (text = ss.scan(/\s+/))
        ;

      when (text = ss.scan(/0[bB][01]+/))
         @rex_tokens.push action { [:NUMBER, text.to_i(2)] }

      when (text = ss.scan(/0[xX][0-9a-fA-F]+/))
         @rex_tokens.push action { [:NUMBER, text.hex] }

      when (text = ss.scan(/0[0-9]+/))
         @rex_tokens.push action { [:NUMBER, text.oct] }

      when (text = ss.scan(/[0-9]+\.[0-9]+([eE][\-\+][0-9]+)?/))
         @rex_tokens.push action { [:NUMBER, text.to_f] }

      when (text = ss.scan(/[1-9][0-9]*/))
         @rex_tokens.push action { [:NUMBER, text.to_i] }

      when (text = ss.scan(/[a-zA-Z_]+/))
         @rex_tokens.push action { [:IDENT, text] }

      when (text = ss.scan(/\*{2}/))
         @rex_tokens.push action { [:MULT2, text] }

      when (text = ss.scan(/<</))
         @rex_tokens.push action { [:LSHIFT, text] }

      when (text = ss.scan(/>>/))
         @rex_tokens.push action { [:RSHIFT, text] }

      when (text = ss.scan(/.|\n/))
         @rex_tokens.push action { [text, text] }

      else
        text = ss.string[ss.pos .. -1]
        raise  ScanError, "can not match: '" + text + "'"
      end  # if

    else
      raise  ScanError, "undefined state: '" + state.to_s + "'"
    end  # case state
  end  # until ss
end

#scan_file(filename) ⇒ Object 



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# File 'lib/einstein/parser.rex.rb', line 35

def scan_file( filename )
  load_file  filename
  do_parse
end

#scan_setup ⇒ Object 



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# File 'lib/einstein/parser.rex.rb', line 17

def scan_setup ; end

#scan_str(str) ⇒ Object 



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# File 'lib/einstein/parser.rex.rb', line 23

def scan_str( str )
  scan_evaluate  str
  do_parse
end