Module: CommandSearch::Mongoer

Defined in:
lib/command_search/mongoer.rb

Class Method Summary collapse

Class Method Details

.build_command(ast_node, command_types) ⇒ Object 



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# File 'lib/command_search/mongoer.rb', line 45

def build_command(ast_node, command_types)
  # aliasing will is done before ast gets to mongoer.rb
  (field_node, search_node) = ast_node[:value]
  key = field_node[:value]
  raw_type = command_types[key.to_sym]
  type = raw_type

  raw_val = search_node[:value]
  search_type = search_node[:type]

  if raw_type.is_a?(Array)
    is_bool = raw_type.include?(:allow_existence_boolean) && is_bool_str?(raw_val) && search_type != :quoted_str
    type = (raw_type - [:allow_existence_boolean]).first
  else
    is_bool = false
    type = raw_type
  end

  if defined?(Boolean) && type == Boolean
    # val = make_boolean(raw_val)
    bool = make_boolean(raw_val)
    bool = !bool if field_node[:negate]
    val = [
      { key => { '$exists' => true } },
      { key => { '$ne' => !bool } }
    ]
    key = '$and'
  elsif is_bool
    # This returns true for empty arrays, when it probably should not.
    # Alternativly, something like tags>5 could return things that have more
    # than 5 tags in the array.
    # https://stackoverflow.com/questions/22367335/mongodb-check-if-value-exists-for-a-field-in-a-document
    # val = { '$exists' => make_boolean(raw_val) }
    bool = make_boolean(raw_val)
    bool = !bool if field_node[:negate]
    if bool
      val = [
        { key => { '$exists' => true } },
        { key => { '$ne' => false } }
      ]
      key = '$and'
    else
      val = { '$exists' => false }
    end
  elsif type == String
    if search_type == :quoted_str
      val = /\b#{Regexp.escape(raw_val)}\b/
      if raw_val[/(^\W)|(\W$)/]
        head_border = '(?<=^|[^:+\w])'
        tail_border = '(?=$|[^:+\w])'
        val = Regexp.new(head_border + Regexp.escape(raw_val) + tail_border)
      end
    else
      val = /#{Regexp.escape(raw_val)}/i
    end
  elsif [Numeric, Integer].include?(type)
    if raw_val == raw_val.to_i.to_s
      val = raw_val.to_i
    elsif raw_val.to_f != 0 || raw_val[/^[\.0]*0$/]
      val = raw_val.to_f
    else
      val = raw_val
    end
  elsif type == Time
    time_str = raw_val.tr('_.-', ' ')
    date = Chronic.parse(time_str, guess: nil)
    if field_node[:negate]
      val = [
        { key => { '$gt' => date.end   } },
        { key => { '$lt' => date.begin } }
      ]
      key = '$or'
    else
      val = [
        { key => { '$gte' => date.begin } },
        { key => { '$lte' => date.end   } }
      ]
      key = '$and'
    end
  end

  if field_node[:negate] && (type == Numeric || type == String)
    { key => { '$not' => val } }
  else
    { key => val }
  end
end

.build_compare(ast_node, command_types) ⇒ Object 



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# File 'lib/command_search/mongoer.rb', line 133

def build_compare(ast_node, command_types)
  flip_ops = {
    '<' => '>',
    '>' => '<',
    '<=' => '>=',
    '>=' => '<='
  }
  reverse_ops = {
    '<' => '>=',
    '<=' => '>',
    '>' => '<=',
    '>=' => '<'
  }
  mongo_op_map = {
    '<' => '$lt',
    '>' => '$gt',
    '<=' => '$lte',
    '>=' => '$gte'
  }

  keys = command_types.keys
  (first_node, last_node) = ast_node[:value]
  key = first_node[:value]
  val = last_node[:value]
  op = ast_node[:nest_op]
  op = reverse_ops[op] if first_node[:negate]

  if keys.include?(val.to_sym)
    (key, val) = [val, key]
    op = flip_ops[op]
  end

  mongo_op = mongo_op_map[op]
  raw_type = command_types[key.to_sym]

  if raw_type.is_a?(Array)
    type = (raw_type - [:allow_boolean]).first
  else
    type = raw_type
  end

  if command_types[val.to_sym]
    val = '$' + val
    key = '$' + key
    val = [key, val]
    key = '$expr'
  elsif type == Numeric
    if val == val.to_i.to_s
      val = val.to_i
    else
      val = val.to_f
    end
  elsif type == Time
    # foo <  day | day.start
    # foo <= day | day.end
    # foo >  day | day.end
    # foo >= day | day.start
    date_start_map = {
      '<' => :start,
      '>' => :end,
      '<=' => :end,
      '>=' => :start
    }
    date_pick = date_start_map[op]
    time_str = val.tr('_.-', ' ')
    date = Chronic.parse(time_str, guess: nil)
    if date_pick == :start
      val = date.first
    elsif date_pick == :end
      val = date.last
    end
  end
  { key => { mongo_op => val } }
end

.build_query(ast, fields, command_types = {}) ⇒ Object 



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# File 'lib/command_search/mongoer.rb', line 259

def build_query(ast, fields, command_types = {})
  # Numbers are searched as strings unless part of a compare/command
  out = ast
  out = decompose_nots(out)
  out = build_searches(out, fields, command_types)
  out = build_tree(out)
  out = collapse_ors(out)
  out = {} if out == []
  out = out.first if out.count == 1
  out = { '$and' => out } if out.count > 1
  out
end

.build_search(ast_node, fields) ⇒ Object 



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

def build_search(ast_node, fields)
  str = ast_node[:value]
  fields = [fields] unless fields.is_a?(Array)
  if ast_node[:type] == :quoted_str
    regex = /\b#{Regexp.escape(str)}\b/
    if str[/(^\W)|(\W$)/]
      head_border = '(?<=^|[^:+\w])'
      tail_border = '(?=$|[^:+\w])'
      regex = Regexp.new(head_border + Regexp.escape(str) + tail_border)
    end
  else
    # TODO: This OR check is only needed due to mutable objects between subclasses of command_search,
    # and is only needed for outside use or benchmarking.
    regex = /#{Regexp.escape(str || '')}/i
  end
  if ast_node[:negate]
    forms = fields.map { |f| { f => { '$not' => regex } } }
  else
    forms = fields.map { |f| { f => regex } }
  end
  return forms if forms.count < 2
  if ast_node[:negate]
    { '$and' => forms }
  else
    { '$or' => forms }
  end
end

.build_searches(ast, fields, command_types) ⇒ Object 



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# File 'lib/command_search/mongoer.rb', line 208

def build_searches(ast, fields, command_types)
  ast.flat_map do |x|
    type = x[:nest_type]
    if type == :colon
      build_command(x, command_types)
    elsif type == :compare
      build_compare(x, command_types)
    elsif [:paren, :pipe, :minus].include?(type)
      x[:value] = build_searches(x[:value], fields, command_types)
      x
    else
      build_search(x, fields)
    end
  end
end

.build_tree(ast) ⇒ Object 



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# File 'lib/command_search/mongoer.rb', line 224

def build_tree(ast)
  ast.flat_map do |x|
    next x unless x[:nest_type]
    mongo_types = { paren: '$and', pipe: '$or', minus: '$not' }
    key = mongo_types[x[:nest_type]]
    { key => build_tree(x[:value]) }
  end
end

.collapse_ors(ast) ⇒ Object 



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# File 'lib/command_search/mongoer.rb', line 233

def collapse_ors(ast)
  ast.flat_map do |x|
    ['$and', '$or', '$not'].map do |key|
      next unless x[key]
      x[key] = collapse_ors(x[key])
    end
    next x unless x['$or']
    val = x['$or'].flat_map { |kid| kid['$or'] || kid }
    { '$or' => val }
  end
end

.decompose_nots(ast, not_depth = 0) ⇒ Object 



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# File 'lib/command_search/mongoer.rb', line 245

def decompose_nots(ast, not_depth = 0)
  ast.flat_map do |x|
    if x[:nest_type] == :minus
      decompose_nots(x[:value], not_depth + 1)
    elsif x[:nest_type]
      x[:value] = decompose_nots(x[:value], not_depth)
      x
    else
      x[:negate] = not_depth.odd?
      x
    end
  end
end

.is_bool_str?(str) ⇒ Boolean

Returns:



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# File 'lib/command_search/mongoer.rb', line 35

def is_bool_str?(str)
  return true if str[/^true$|^false$/i]
  false
end

.make_boolean(str) ⇒ Object 



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# File 'lib/command_search/mongoer.rb', line 40

def make_boolean(str)
  return true if str[/^true$/i]
  false
end