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 19

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.


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# File 'lib/puppetdb/lexer.rb', line 18

def lineno
  @lineno
end

Instance Method Details

#action(&block) ⇒ Object 


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# File 'lib/puppetdb/lexer.rb', line 23

def action &block
  yield
end

#load_file(filename) ⇒ Object 


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# File 'lib/puppetdb/lexer.rb', line 32

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/puppetdb/lexer.rb', line 44

def next_token
  @rex_tokens.shift
end

#scan_evaluate(str) ⇒ Object 


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# File 'lib/puppetdb/lexer.rb', line 48

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(/\(/))
         @rex_tokens.push action { [:LPAREN, text] }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

      when (text = ss.scan(/@@/))
         @rex_tokens.push 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
  end  # until ss
end

#scan_file(filename) ⇒ Object 


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# File 'lib/puppetdb/lexer.rb', line 39

def scan_file( filename )
  load_file  filename
  do_parse
end

#scan_setup ⇒ Object 


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

def scan_setup ; end

#scan_str(str) ⇒ Object 


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

def scan_str( str )
  scan_evaluate  str
  do_parse
end