Class: HashConditions::Matcher

Inherits:
Object
  • Object
show all
Extended by:
Core
Defined in:
lib/hash_conditions/matcher.rb

Constant Summary

Constants included from Core

Core::ARITMETIC_OPERATORS, Core::DEBUG, Core::PRECISION

Class Method Summary collapse

Methods included from Core

_ext_get_module, _ext_match, _ext_parse, _ext_read_module, add_bundle, bundles, contains_bundle, eval_expression, eval_operand, extract_expression, get_condition_from_expression, get_key, get_op, iterator, log, module_match, modules, ops, re_type, reset, results_from_expression, rev_op

Class Method Details

.configuration(key) ⇒ Object 



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# File 'lib/hash_conditions/matcher.rb', line 26

def self.configuration key
  configurations[key]
end

.configurations ⇒ Object 



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# File 'lib/hash_conditions/matcher.rb', line 18

def self.configurations
  @@configurations ||= {}
end

.configure(config) ⇒ Object 



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# File 'lib/hash_conditions/matcher.rb', line 22

def self.configure config
  configurations.merge! config
end

.critical_times(hash, expressions, options = {}) ⇒ Object 



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# File 'lib/hash_conditions/matcher.rb', line 97

def self.critical_times hash, expressions, options = {}
  current_time = options[:current_time] ||= Time.now
  expressions.
    map do | e |
      inverter = operand_uses_now?(e[:value])? -1: 1
      case e[:operator]
        when :<, :<=, :>, :>= then
          diff = inverter * get_diff( eval_operand( hash, e[:value], options ),
                                      eval_operand( hash, e[:key], options.merge(is_key: true) )) + 0.001
        when :==, :!= then
          # TODO: test this functionality
          diff = inverter * get_diff( eval_operand( hash, e[:value], options ),
                                      eval_operand(hash, e[:key], options.merge(is_key: true) ) )
        when :between
          diff = inverter * get_diff( eval_operand( hash, e[:value][0], options ),
                                      eval_operand(hash, e[:key], options.merge(is_key: true) ) )
          diff = inverter * get_diff( eval_operand( hash, e[:value][1], options ),
                                      eval_operand(hash, e[:key], options.merge(is_key: true) ) ) if current_time + diff < current_time
      end

      current_time + diff
    end
end

.finalize(hash, array, options) ⇒ Object 



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# File 'lib/hash_conditions/matcher.rb', line 44

def self.finalize hash, array, options
  case options[:glue]
    when :or then array.any?
    when :and then array.all?
  end
end

.fix_for_aritmetics(*values) ⇒ Object 



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# File 'lib/hash_conditions/matcher.rb', line 5

def self.fix_for_aritmetics *values
  class_precedence = [ Float, Integer, String ]

  klass = class_precedence.find{ |k| values.any?{ |v| v.is_a? k } } || NilClass

  values = case klass.name
    when "Integer" then values.map(&:to_i)
    when "Float"   then values.map(&:to_f).map{|x|x.round(3)}
    when "String"  then values.map(&:to_s)
    else values
  end
end

.get_diff(*values) ⇒ Object 



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# File 'lib/hash_conditions/matcher.rb', line 121

def self.get_diff *values
  fix_for_aritmetics(*values).inject(&:-)
end

.match(hash, conditions, options = {}) ⇒ Object 



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# File 'lib/hash_conditions/matcher.rb', line 30

def self.match hash, conditions, options = {}
  options = {
    operation: :match,
    result: lambda{ | expression, options |
      match_single hash, expression, options
    },
    finalize: lambda{ | array, options |
      finalize hash, array, options
    }
  }.merge options

  iterator conditions, options
end

.match_single(hash, expression, options) ⇒ Object 



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# File 'lib/hash_conditions/matcher.rb', line 51

def self.match_single hash, expression, options
  log "Matching:", expression
  hash_value = eval_operand hash, expression[:key], options.merge(is_key: true)
  comparisson_value = eval_operand hash, expression[ :value ], options

  log "Left:", hash_value
  log "Right:", comparisson_value

  case expression[:operator]
    when :==
      if configuration( :force_string_comparations )
        hash_value = hash_value.to_s
        comparisson_value = comparisson_value.to_s
      end
      hash_value == comparisson_value
    when :in
      if configuration( :force_string_comparations )
        hash_value = hash_value.to_s
        comparisson_value = comparisson_value.map(&:to_s)
      end

      comparisson_value.include? hash_value
    when :between
      values = fix_for_aritmetics hash_value, *comparisson_value
      values[0] >= values[1] and values[0] < values[2]
    when :contains
      !! %r{#{comparisson_value}}.match( hash_value )
    else
      values = fix_for_aritmetics hash_value, comparisson_value
      values[0].send( expression[:operator], values[1] )
  end
  # rescue
    # raise "The expression: #{ expression } has an error"
end

.operand_uses_now?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hash_conditions/matcher.rb', line 147

def self.operand_uses_now? key
  case key
    when String, Symbol
      key.to_s == '$now'
    when Hash
      op, values = key.to_a.first
      values.map{ |v| operand_uses_now? v }.any?
    when Array
      key.map{ |v| operand_uses_now? v }.any?
    else
      false
  end
end

.time_expressions(conditions) ⇒ Object 



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# File 'lib/hash_conditions/matcher.rb', line 125

def self.time_expressions conditions
  expressions = []
  iterator conditions,
    operation: :match,
    result: lambda{ | expression, options |
      expressions << expression if uses_now? expression
    },
    finalize: lambda{ | array, options |
      expressions
    }

  expressions
end

.time_sensible?(conditions) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hash_conditions/matcher.rb', line 139

def self.time_sensible? conditions
  ! time_expressions(conditions).empty?
end

.uses_now?(expression) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hash_conditions/matcher.rb', line 143

def self.uses_now? expression
  operand_uses_now? expression[:key]  or operand_uses_now? expression[:value]
end

.when(hash, query, options = {}) ⇒ Object 



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# File 'lib/hash_conditions/matcher.rb', line 86

def self.when hash, query, options = {}
  current_time = options[:current_time] ||= Time.now
  now_result = match hash, query, options
  test_times = critical_times( hash, time_expressions( query ), options )
  test_times.
   sort.
   drop_while{ |t| t < current_time }.
   find{ |t| now_result != match( hash, query, options.merge(current_time: t) ) }.
   tap{ |t| log 'Critical Times:', t }
end