Class: Reading::Stats::Filter

Inherits:
Object
  • Object
show all
Defined in:
lib/reading/stats/filter.rb

Overview

The parts of a query that filter the data being queried, e.g. “genre=history”.

Class Method Summary collapse

Class Method Details

.filter(input, items) ⇒ Object

Determines which filters are contained in the given input, and then runs them to get the remaining Items. For the filters and their actions, see the constants below.

Parameters:

  • input (String) —

    the query string.

  • items (Array<Item>) —

    the Items on which to run the operation.

Returns:

  • (Object) —

    the return value of the action.



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# File 'lib/reading/stats/filter.rb', line 11

def self.filter(input, items)
  filtered_items = items

  split_input = input.split(INPUT_SPLIT)

  split_input[1..].each do |filter_input|
    match_found = false

    REGEXES.each do |key, regex|
      match = filter_input.match(regex)

      if match
        match_found = true

        begin
          filtered_items = filter_single(
            key,
            match[:predicate],
            match[:operator],
            filtered_items,
          )
        rescue InputError => e
          raise InputError, "#{e.message} in \"#{input}\""
        end
      end
    end

    unless match_found
      raise InputError, "Invalid filter \"#{filter_input}\" in \"#{input}\""
    end
  end

  filtered_items
end