Module: ACLSystem2::LogicParser

Included in:
AccessHandler
Defined in:
lib/acl_system2/logic_parser.rb

Instance Method Summary collapse

Instance Method Details

#process(logicstring, context) ⇒ Object

recursively processes an permission string and returns true or false



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# File 'lib/acl_system2/logic_parser.rb', line 9

def process(logicstring, context)
  # if logicstring contains any parenthasized patterns, call process recursively on them
  while logicstring =~ /\(/
    logicstring.sub!(/\(([^\)]+)\)/) {
      process($1, context)
    }
  end
  
  # process each operator in order of precedence
  #!
  while logicstring =~ /!/
    logicstring.sub!(/!([^ &|]+)/) { 
      (!check(logicstring[$1], context)).to_s
    }
  end
  
  #&
  if logicstring =~ /&/
    return (process(logicstring[/^[^&]+/], context) and process(logicstring[/^[^&]+&(.*)$/,1], context))
  end
  
  #|
  if logicstring =~ /\|/
    return (process(logicstring[/^[^\|]+/], context) or process(logicstring[/^[^\|]+\|(.*)$/,1], context))
  end
  
  # constants
  if logicstring =~ /^\s*true\s*$/i
    return true
  elsif logicstring =~ /^\s*false\s*$/i
    return false
  end
  
  # single list items
  (check(logicstring.strip, context))
end