Module: Caboose::LogicParser

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

Instance Method Summary collapse

Instance Method Details

#process(logicstring, context) ⇒ Object

recursively processes an permission string and returns true or false



9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
 
# File 'lib/acl_system2/caboose/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