Module: CommandSearch::Normalizer

Defined in:
lib/command_search/normalizer.rb

Class Method Summary collapse

Class Method Details

.cast_bool(type, node) ⇒ Object 



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# File 'lib/command_search/normalizer.rb', line 7

def cast_bool(type, node)
  if type == Boolean
    node[:type] = Boolean
    node[:value] = !!node[:value][0][/t/i]
    return
  end
  return unless type.is_a?(Array) && type.include?(:allow_existence_boolean)
  return unless node[:type] == :str && node[:value][/\Atrue\Z|\Afalse\Z/i]
  node[:type] = :existence
  node[:value] = !!node[:value][0][/t/i]
end

.cast_regex(node) ⇒ Object 



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# File 'lib/command_search/normalizer.rb', line 46

def cast_regex(node)
  type = node[:type]
  return unless type == :str || type == :quoted_str || type == :number
  raw = node[:value]
  str = Regexp.escape(raw)
  return node[:value] = /#{str}/i unless type == :quoted_str
  return node[:value] = '' if raw == ''
  return node[:value] = /\b#{str}\b/ unless raw[/(^\W)|(\W$)/]
  border_a = '(^|\s|[^:+\w])'
  border_b = '($|\s|[^:+\w])'
  node[:value] = Regexp.new(border_a + str + border_b)
end

.cast_time(node) ⇒ Object 



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# File 'lib/command_search/normalizer.rb', line 19

def cast_time(node)
  search_node = node[:value][1]
  search_node[:type] = Time
  str = search_node[:value]
  if str == str.to_i.to_s
    search_node[:value] = [Time.new(str), Time.new(str.to_i + 1)]
  else
    time_str = str.tr('._-', ' ')
    times = Chronic.parse(time_str, { guess: nil })
    times ||= Chronic.parse(str, { guess: nil })
    if times
      search_node[:value] = [times.first, times.last]
    else
      search_node[:value] = nil
      return
    end
  end
  return unless node[:nest_type] == :compare
  op = node[:nest_op]
  if op == '<' || op == '>='
    search_node[:value] = search_node[:value].first
  else
    search_node[:value] = search_node[:value].last
    search_node[:value] -= 1
  end
end

.dealias!(ast, cmd_fields) ⇒ Object 



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# File 'lib/command_search/normalizer.rb', line 73

def dealias!(ast, cmd_fields)
  ast.map! do |node|
    nest = node[:nest_type]
    unless nest
      node[:number_value] = node[:value] if node[:type] == :number
      cast_regex(node)
      next node
    end
    unless nest == :colon || nest == :compare
      dealias!(node[:value], cmd_fields)
      next node
    end
    flip_operator!(node, cmd_fields) if nest == :compare
    (key_node, search_node) = node[:value]
    new_key = dealias_key(key_node[:value], cmd_fields)
    type = cmd_fields[new_key.to_sym]
    node[:value][0][:value] = new_key
    if type
      cast_bool(type, search_node)
      type = (type - [:allow_existence_boolean]).first if type.is_a?(Array)
      cast_time(node) if [Time, Date, DateTime].include?(type)
      cast_regex(search_node) if type == String
      next node
    end
    str_values = "#{new_key}#{node[:nest_op]}#{search_node[:value]}"
    node = { type: :str, value: str_values }
    cast_regex(node)
    node
  end
end

.dealias_key(key, cmd_fields) ⇒ Object 



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# File 'lib/command_search/normalizer.rb', line 68

def dealias_key(key, cmd_fields)
  key = cmd_fields[key.to_sym] while cmd_fields[key.to_sym].is_a?(Symbol)
  key.to_s
end

.flip_operator!(node, cmd_fields) ⇒ Object 



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# File 'lib/command_search/normalizer.rb', line 59

def flip_operator!(node, cmd_fields)
  val = node[:value]
  return if cmd_fields[val[0][:value].to_sym]
  return unless cmd_fields[val[1][:value].to_sym]
  flip_ops = { '<' => '>', '>' => '<', '<=' => '>=', '>=' => '<=' }
  node[:nest_op] = flip_ops[node[:nest_op]]
  node[:value].reverse!
end

.normalize!(ast, cmd_fields) ⇒ Object 



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# File 'lib/command_search/normalizer.rb', line 104

def normalize!(ast, cmd_fields)
  dealias!(ast, cmd_fields)
  clean = {}
  cmd_fields.each do |k, v|
    next if v.is_a?(Symbol)
    if v.is_a?(Array)
      clean[k] = (v - [:allow_existence_boolean]).first
      next
    end
    v = Numeric if v == Integer
    v = Time if v == Date
    v = Time if v == DateTime
    next clean[k] = v
  end
  clean
end