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impress/app/models/item/search/query.rb

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# encoding=utf-8
# ^ to put the regex in utf-8 mode
class Item
module Search
class Query
def initialize(filters, user, text=nil)
@filters = filters
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@user = user
@text = text
end
def results
@filters.map(&:to_query).inject(Item.all, &:merge).order(:name)
end
def to_s
@text || @filters.map(&:to_s).join(' ')
end
TEXT_FILTER_EXPR = /([+-]?)(?:(\p{Word}+):)?(?:"([^"]+)"|(\S+))/
def self.from_text(text, user=nil)
filters = []
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text.scan(TEXT_FILTER_EXPR) do |sign, key, quoted_value, unquoted_value|
key = 'name' if key.blank?
value = quoted_value || unquoted_value
is_positive = (sign != '-')
case key
when 'name'
filters << (is_positive ?
Filter.name_includes(value) :
Filter.name_excludes(value))
when 'occupies'
filters << (is_positive ?
Filter.occupies(value) :
Filter.not_occupies(value))
when 'restricts'
filters << (is_positive ?
Filter.restricts(value) :
Filter.not_restricts(value))
when 'fits'
color_name, species_name = value.split("-")
pet_type = load_pet_type_by_name(color_name, species_name)
filters << (is_positive ?
Filter.fits(pet_type.body_id, color_name, species_name) :
Filter.not_fits(pet_type.body_id, color_name, species_name))
when 'species'
begin
species = Species.find_by_name!(value)
color = Color.find_by_name!('blue')
pet_type = PetType.where(color_id: color.id, species_id: species.id).first!
rescue ActiveRecord::RecordNotFound
message = I18n.translate('items.search.errors.not_found.species',
species_name: value.capitalize)
raise Item::Search::Error, message
end
filters << (is_positive ?
Filter.fits_species(pet_type.body_id, value) :
Filter.not_fits_species(pet_type.body_id, value))
when 'user'
if user.nil?
message = I18n.translate('items.search.errors.not_logged_in')
raise Item::Search::Error, message
end
case value
when 'owns'
filters << (is_positive ?
Filter.owned_by(user) :
Filter.not_owned_by(user))
when 'wants'
filters << (is_positive ?
Filter.wanted_by(user) :
Filter.not_wanted_by(user))
else
message = I18n.translate('items.search.errors.not_found.ownership',
keyword: value)
raise Item::Search::Error, message
end
when 'is'
case value
when 'nc'
filters << (is_positive ? Filter.is_nc : Filter.is_not_nc)
when 'np'
filters << (is_positive ? Filter.is_np : Filter.is_not_np)
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when 'pb'
filters << (is_positive ? Filter.is_pb : Filter.is_not_pb)
else
message = I18n.translate('items.search.errors.not_found.label',
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:label => "is:#{value}")
raise Item::Search::Error, message
end
else
message = I18n.translate('items.search.errors.not_found.label',
:label => key)
raise Item::Search::Error, message
end
end
self.new(filters, user, text)
end
def self.from_params(params, user=nil)
filters = []
params.values.each do |filter_params|
key = filter_params[:key]
value = filter_params[:value]
is_positive = filter_params[:is_positive] != 'false'
case filter_params[:key]
when 'name'
filters << (is_positive ?
Filter.name_includes(value) :
Filter.name_excludes(value))
when 'is_nc'
filters << (is_positive ? Filter.is_nc : Filter.is_not_nc)
when 'is_pb'
filters << (is_positive ? Filter.is_pb : Filter.is_not_pb)
when 'is_np'
filters << (is_positive ? Filter.is_np : Filter.is_not_np)
when 'occupied_zone_set_name'
filters << (is_positive ? Filter.occupies(value) :
Filter.not_occupies(value))
when 'restricted_zone_set_name'
filters << (is_positive ?
Filter.restricts(value) :
Filter.not_restricts(value))
when 'fits'
raise NotImplementedError if value[:alt_style_id].present?
pet_type = load_pet_type_by_color_and_species(
value[:color_id], value[:species_id])
color = Color.find value[:color_id]
species = Species.find value[:species_id]
filters << (is_positive ?
Filter.fits(pet_type.body_id, color.name, species.name) :
Filter.not_fits(pet_type.body_id, color.name, species.name))
when 'user_closet_hanger_ownership'
case value
when 'true'
filters << (is_positive ?
Filter.owned_by(user) :
Filter.not_owned_by(user))
when 'false'
filters << (is_positive ?
Filter.wanted_by(user) :
Filter.not_wanted_by(user))
end
else
Rails.logger.warn "Ignoring unexpected search filter key: #{key}"
end
end
self.new(filters, user)
end
def self.load_pet_type_by_name(color_name, species_name)
begin
PetType.matching_name(color_name, species_name).first!
rescue ActiveRecord::RecordNotFound
message = I18n.translate('items.search.errors.not_found.pet_type',
name1: color_name.capitalize, name2: species_name.capitalize)
raise Item::Search::Error, message
end
end
def self.load_pet_type_by_color_and_species(color_id, species_id)
begin
PetType.where(color_id: color_id, species_id: species_id).first!
rescue ActiveRecord::RecordNotFound
color_name = Color.find(color_id).name rescue "Color #{color_id}"
species_name = Species.find(species_id).name rescue "Species #{species_id}"
message = I18n.translate('items.search.errors.not_found.pet_type',
name1: color_name.capitalize, name2: species_name.capitalize)
raise Item::Search::Error, message
end
end
end
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class Error < Exception
end
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private
# A Filter is basically a wrapper for an Item scope, with extra info about
# how to convert it into a search query string.
class Filter
def initialize(query, text)
@query = query
@text = text
end
def to_query
@query
end
def to_s
@text
end
def inspect
"#<#{self.class.name} #{@text.inspect}>"
end
def self.name_includes(value)
self.new Item.name_includes(value), "#{q value}"
end
def self.name_excludes(value)
self.new Item.name_excludes(value), "-#{q value}"
end
def self.occupies(value)
self.new Item.occupies(value), "occupies:#{q value}"
end
def self.not_occupies(value)
self.new Item.not_occupies(value), "-occupies:#{q value}"
end
def self.restricts(value)
self.new Item.restricts(value), "restricts:#{q value}"
end
def self.not_restricts(value)
self.new Item.not_restricts(value), "-restricts:#{q value}"
end
def self.fits(body_id, color_name, species_name)
# NOTE: Some color syntaxes are weird, like `fits:"polka dot-aisha"`!
value = "#{color_name}-#{species_name}".downcase
self.new Item.fits(body_id), "fits:#{q value}"
end
def self.not_fits(body_id, color_name, species_name)
# NOTE: Some color syntaxes are weird, like `fits:"polka dot-aisha"`!
value = "#{color_name}-#{species_name}".downcase
self.new Item.not_fits(body_id), "-fits:#{q value}"
end
def self.fits_species(body_id, species_name)
self.new Item.fits(body_id), "species:#{q species_name}"
end
def self.not_fits_species(body_id, species_name)
self.new Item.not_fits(body_id), "-species:#{q species_name}"
end
def self.owned_by(user)
self.new user.owned_items, 'user:owns'
end
def self.not_owned_by(user)
self.new user.unowned_items, 'user:owns'
end
def self.wanted_by(user)
self.new user.wanted_items, 'user:wants'
end
def self.not_wanted_by(user)
self.new user.unwanted_items, 'user:wants'
end
def self.is_nc
self.new Item.is_nc, 'is:nc'
end
def self.is_not_nc
self.new Item.is_not_nc, '-is:nc'
end
def self.is_np
self.new Item.is_np, 'is:np'
end
def self.is_not_np
self.new Item.is_not_np, '-is:np'
end
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def self.is_pb
self.new Item.is_pb, 'is:pb'
end
def self.is_not_pb
self.new Item.is_not_pb, '-is:pb'
end
private
# Add quotes around the value, if needed.
def self.q(value)
/\s/.match(value) ? '"' + value + '"' : value
end
end
end
end