Class: CmisServer::Query::ParserRex

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/cmis_server/query/parser_rex.rb

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/cmis_server/query/parser_rex.rb', line 17

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/cmis_server/query/parser_rex.rb', line 16

def lineno
  @lineno
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/cmis_server/query/parser_rex.rb', line 18

def state
  @state
end

Instance Method Details

#_next_token ⇒ Object 



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# File 'lib/cmis_server/query/parser_rex.rb', line 57

def _next_token
  text = @ss.peek(1)
  @lineno  +=  1  if text == "\n"
  token = case @state
  when nil
    case
    when (text = @ss.scan(/\'[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]T[0-9][0-9]:[0-9][0-9]:[0-9][0-9]\.[0-9][0-9][0-9]\'/i))
       action { [:date_string, DateTime.parse(text)] }

    when (text = @ss.scan(/\'/i))
       action { @state = :STRS;  [:quote, text] }

    when (text = @ss.scan(/[0-9]+/i))
       action { [:unsigned_integer, text.to_i] }

    when (text = @ss.scan(/\s+/i))
      ;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    when (text = @ss.scan(/NOT/i))
       action { [:NOT, text] }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    when (text = @ss.scan(/`[\w:]+`/i))
       action { [:identifier, text[1..-2]] }

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

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

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

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

  when :STRS
    case
    when (text = @ss.scan(/\'/i))
       action { @state = nil;    [:quote, text] }

    when (text = @ss.scan(/[^\']*/i))
       action {                  [:character_string_literal, text.gsub("''", "'")] }

    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
  p token
  token
end

#action ⇒ Object 



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# File 'lib/cmis_server/query/parser_rex.rb', line 26

def action
  yield
end

#load_file(filename) ⇒ Object 



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# File 'lib/cmis_server/query/parser_rex.rb', line 36

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/cmis_server/query/parser_rex.rb', line 49

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/cmis_server/query/parser_rex.rb', line 43

def scan_file( filename )
  load_file(filename)
  do_parse
end

#scan_setup(str) ⇒ Object 



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# File 'lib/cmis_server/query/parser_rex.rb', line 20

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/cmis_server/query/parser_rex.rb', line 30

def scan_str(str)
  scan_setup(str)
  do_parse
end