class YaccShave::Parser

Constants

Racc_arg
Racc_debug_parser
Racc_token_to_s_table

Attributes

filename[R]
lineno[R]
state[RW]

Public Instance Methods

_next_token() click to toggle source
# File lib/yacc_shave/parser/lexer.rb, line 54
def _next_token
  text = @ss.peek(1)
  @lineno  +=  1  if text == "\n"
  token = case @state
  when nil
    case
    when (text = @ss.scan(/\d+/))
       action { [:INTEGER, text.to_i] }

    when (text = @ss.scan(/[a-z_?!]+/))
       action { [:IDENTIFIER, text]}

    when (text = @ss.scan(/\+/))
       action { [:ADD, text] }

    when (text = @ss.scan(/\=/))
       action { [:ASSIGN, text]}

    when (text = @ss.scan(/\{/))
       action { [:LCBRA, text]}

    when (text = @ss.scan(/\}/))
       action { [:RCBRA, text]}

    when (text = @ss.scan(/\,/))
       action { [:COMMA, text]}

    when (text = @ss.scan(/\./))
       action { [:DOT, text]}

    when (text = @ss.scan(/\n/))
       action { [:NEWLINE, text]}

    when (text = @ss.scan(/./))
      ;

    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
  token
end
_reduce_none(val, _values) click to toggle source

reduce 16 omitted

# File lib/yacc_shave/parser/parser.rb, line 226
def _reduce_none(val, _values)
  val[0]
end
action() { || ... } click to toggle source
# File lib/yacc_shave/parser/lexer.rb, line 23
def action
  yield
end
load_file( filename ) click to toggle source
# File lib/yacc_shave/parser/lexer.rb, line 33
def load_file( filename )
  @filename = filename
  open(filename, "r") do |f|
    scan_setup(f.read)
  end
end
next_token() click to toggle source
# File lib/yacc_shave/parser/lexer.rb, line 46
def next_token
  return if @ss.eos?
  
  # skips empty actions
  until token = _next_token or @ss.eos?; end
  token
end
scan(str)
Alias for: scan_str
scan_file( filename ) click to toggle source
# File lib/yacc_shave/parser/lexer.rb, line 40
def scan_file( filename )
  load_file(filename)
  do_parse
end
scan_setup(str) click to toggle source
# File lib/yacc_shave/parser/lexer.rb, line 17
def scan_setup(str)
  @ss = StringScanner.new(str)
  @lineno =  1
  @state  = nil
end
scan_str(str) click to toggle source
# File lib/yacc_shave/parser/lexer.rb, line 27
def scan_str(str)
  scan_setup(str)
  do_parse
end
Also aliased as: scan
tokenize(code) click to toggle source
# File lib/yacc_shave/parser/lexer.rb, line 101
def tokenize(code)
  scan_setup(code)
  tokens = []
  while token = next_token
    tokens << token
  end
  tokens
end