Class: Ruote::RuleSession

Inherits:
Object
  • Object
show all
Defined in:
lib/ruote/util/filter.rb

Overview

:nodoc:

The class used to run a rule (a line of a filter).

Constant Summary collapse

SKIP = 
%w[ and or fields field f ]
BOOLEANS = 
%w[ and or ]
NUMBER_CLASSES = 
[ Fixnum, Float ]
BOOLEAN_CLASSES = 
[ TrueClass, FalseClass ]
TILDE = 
/^~/
RTILDE = 
/^\^~/
COMMA_SPLIT = 
/ *, */
PIPE_SPLIT = 
/ *\| */

Instance Method Summary collapse

Constructor Details

#initialize(hash, rule) ⇒ RuleSession

Returns a new instance of RuleSession.

Raises:

  • (ArgumentError) 


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# File 'lib/ruote/util/filter.rb', line 137

def initialize(hash, rule)

  @hash = hash
  @rule = rule

  fl = @rule['fields'] || @rule['field'] || @rule['f']

  raise ArgumentError.new(
    "filter is missing a 'fields', 'field' or 'f' arg at #{@rule.inspect}"
  ) unless fl

  if fl.is_a?(String)
    fl = fl.gsub(/!/, '\.') if REGEX_IN_STRING.match(fl)
    fl = Ruote.regex_or_s(fl)
  end

  @fields = if fl.is_a?(Regexp)

    # when restoring, you look at the old keys, not the current ones

    keys = Ruote.flatten_keys(@rule['restore'] ? @hash['~~'] : @hash)
    keys = keys.reject { |k| TILDE.match(k) } unless RTILDE.match(fl.source)

    # now only keep the keys that match our regexp

    keys.each_with_object([]) { |k, a|
      m = fl.match(k)
      a << [ k, Ruote.lookup(@hash, k), m[1..-1] ] if m
    }

  elsif fl.is_a?(String) and PIPE_SPLIT.match(fl)

    fields = fl.split(PIPE_SPLIT).collect { |field|
      val = Ruote.lookup(@hash, field)
      val.nil? ? nil : [ field, val, nil ]
    }.compact

    fields.empty? ? [ [ fl, nil, nil ] ] : fields
      # if no fields where found, place fake fl field to force failure

  else

    (fl.is_a?(Array) ? fl : fl.to_s.split(COMMA_SPLIT)).collect { |field|
      [ field,  Ruote.lookup(@hash, field), nil ]
    }
  end
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/ruote/util/filter.rb', line 185

def run

  keys = @rule.keys - SKIP
  validation = (@rule.keys & BOOLEANS).empty?

  if validation and @fields.empty? and keys.empty?
    fl = @rule['fields'] || @rule['field'] || @rule['f']
    return [ [ @rule, fl, nil ] ] # validation break
  end

  @fields.collect { |field, value, matches|

    valid = nil

    if keys.empty?

      valid = (value != nil)

    else

      keys.each do |k|

        v = @rule[k]

        m = "_#{k}"
        next unless self.respond_to?(m)

        r = self.send(m, field, value, matches, k, v)

        valid = false if r == false
      end
    end

    raise_or_and(valid, field, value)

  }.compact
end