Class: PuppetDB::Lexer

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/puppetdb/lexer.rb

Direct Known Subclasses

Parser

Defined Under Namespace

Classes: ScanError

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/puppetdb/lexer.rb', line 18

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/puppetdb/lexer.rb', line 17

def lineno
  @lineno
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/puppetdb/lexer.rb', line 19

def state
  @state
end

Instance Method Details

#_next_token ⇒ Object 



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# File 'lib/puppetdb/lexer.rb', line 58

def _next_token
  text = @ss.peek(1)
  @lineno  +=  1  if text == "\n"
  token = case @state
  when nil
    case
    when (text = @ss.scan(/\s/))
      ;

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

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

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

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

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

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

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

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

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

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

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

    when (text = @ss.scan(/not(?![\w_:])/))
       action { [:NOT, text] }

    when (text = @ss.scan(/and(?![\w_:])/))
       action { [:AND, text] }

    when (text = @ss.scan(/or(?![\w_:])/))
       action { [:OR, text] }

    when (text = @ss.scan(/true(?![\w_:])/))
       action { [:BOOLEAN, true]}

    when (text = @ss.scan(/false(?![\w_:])/))
       action { [:BOOLEAN, false]}

    when (text = @ss.scan(/-?\d+\.\d+/))
       action { [:NUMBER, text.to_f] }

    when (text = @ss.scan(/-?\d+/))
       action { [:NUMBER, text.to_i] }

    when (text = @ss.scan(/\"(\\.|[^\\"])*\"/))
       action { [:STRING, YAML.load(text)] }

    when (text = @ss.scan(/\'(\\.|[^\\'])*\'/))
       action { [:STRING, YAML.load(text)] }

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

    when (text = @ss.scan(/@@/))
       action { [:EXPORTED, 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
  token
end

#action ⇒ Object 



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# File 'lib/puppetdb/lexer.rb', line 27

def action
  yield
end

#load_file(filename) ⇒ Object 



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# File 'lib/puppetdb/lexer.rb', line 37

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

#next_token ⇒ Object 



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# File 'lib/puppetdb/lexer.rb', line 50

def next_token
  return if @ss.eos?
  
  # skips empty actions
  until token = _next_token or @ss.eos?; end
  token
end

#scan_file(filename) ⇒ Object 



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# File 'lib/puppetdb/lexer.rb', line 44

def scan_file( filename )
  load_file(filename)
  do_parse
end

#scan_setup(str) ⇒ Object 



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# File 'lib/puppetdb/lexer.rb', line 21

def scan_setup(str)
  @ss = StringScanner.new(str)
  @lineno =  1
  @state  = nil
end

#scan_str(str) ⇒ Object Also known as: scan 



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# File 'lib/puppetdb/lexer.rb', line 31

def scan_str(str)
  scan_setup(str)
  do_parse
end