Class: Net::LDAP::FilterParser

Inherits:
Object
  • Object
show all
Defined in:
lib/net/ldap/filter.rb

Overview

:nodoc:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(str) ⇒ FilterParser

Returns a new instance of FilterParser.



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# File 'lib/net/ldap/filter.rb', line 299

def initialize str
  require 'strscan'
  @filter = parse( StringScanner.new( str )) or raise Net::LDAP::LdapError.new( "invalid filter syntax" )
end

Instance Attribute Details

#filter ⇒ Object (readonly)

Returns the value of attribute filter.



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# File 'lib/net/ldap/filter.rb', line 297

def filter
  @filter
end

Instance Method Details

#parse(scanner) ⇒ Object 



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# File 'lib/net/ldap/filter.rb', line 304

def parse scanner
  parse_filter_branch(scanner) or parse_paren_expression(scanner)
end

#parse_filter_branch(scanner) ⇒ Object 



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# File 'lib/net/ldap/filter.rb', line 352

def parse_filter_branch scanner
  scanner.scan /\s*/
  if token = scanner.scan( /[\w\-_]+/ )
    scanner.scan /\s*/
    if op = scanner.scan( /\=|\<\=|\<|\>\=|\>|\!\=/ )
      scanner.scan /\s*/
      if value = scanner.scan( /[\w\*\.]+/ )
        case op
        when "="
          Filter.eq( token, value )
        when "!="
          Filter.ne( token, value )
        when "<"
          Filter.lt( token, value )
        when "<="
          Filter.le( token, value )
        when ">"
          Filter.gt( token, value )
        when ">="
          Filter.ge( token, value )
        end
      end
    end
  end
end

#parse_paren_expression(scanner) ⇒ Object 



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# File 'lib/net/ldap/filter.rb', line 308

def parse_paren_expression scanner
  if scanner.scan /\s*\(\s*/
    b = if scanner.scan /\s*\&\s*/
      a = nil
      branches = []
      while br = parse_paren_expression(scanner)
        branches << br
      end
      if branches.length >= 2
        a = branches.shift
        while branches.length > 0
          a = a & branches.shift
        end
        a
      end
    elsif scanner.scan /\s*\|\s*/
      # TODO: DRY!
      a = nil
      branches = []
      while br = parse_paren_expression(scanner)
        branches << br
      end
      if branches.length >= 2
        a = branches.shift
        while branches.length > 0
          a = a | branches.shift
        end
        a
      end
    elsif scanner.scan /\s*\!\s*/
      br = parse_paren_expression(scanner)
      if br
        ~ br
      end
    else
      parse_filter_branch( scanner )
    end

    if b and scanner.scan( /\s*\)\s*/ )
      b
    end
  end
end