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Refactoring typecast so that it is less invasive and uses latest code base

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This commit is contained in:
Sam Lown 2010-03-03 02:18:32 +00:00
parent 88f42d8fe0
commit d992f44365
6 changed files with 222 additions and 247 deletions
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95
lib/couchrest/mixins/properties.rb
View file

@ -1,23 +1,6 @@
require 'time'
require File.join(File.dirname(__FILE__), '..', 'more', 'property')
class Time
# returns a local time value much faster than Time.parse
def self.mktime_with_offset(string)
string =~ /(\d{4})[\-|\/](\d{2})[\-|\/](\d{2})[T|\s](\d{2}):(\d{2}):(\d{2})([\+|\s|\-])*(\d{2}):?(\d{2})/
# $1 = year
# $2 = month
# $3 = day
# $4 = hours
# $5 = minutes
# $6 = seconds
# $7 = time zone direction
# $8 = tz difference
# utc time with wrong TZ info:
time = mktime($1, RFC2822_MONTH_NAME[$2.to_i - 1], $3, $4, $5, $6, $7)
tz_difference = ("#{$7 == '-' ? '+' : '-'}#{$8}".to_i * 3600)
time + tz_difference + zone_offset(time.zone)
end
end
require File.join(File.dirname(__FILE__), '..', 'more', 'typecast')
module CouchRest
module Mixins
@ -25,6 +8,8 @@ module CouchRest
class IncludeError < StandardError; end
include ::CouchRest::More::Typecast
def self.included(base)
base.class_eval <<-EOS, __FILE__, __LINE__ + 1
extlib_inheritable_accessor(:properties) unless self.respond_to?(:properties)
@ -55,35 +40,34 @@ module CouchRest
def cast_keys
return unless self.class.properties
self.class.properties.each do |property|
cast_property(property)
end
end
def cast_property(property, assigned=false)
return unless property.casted
key = self.has_key?(property.name) ? property.name : property.name.to_sym
# Don't cast the property unless it has a value
next if (value = self[key]).nil?
# Don't cast the property if it is not accessible
if self.class.respond_to? :accessible_properties
next if self.class.accessible_properties.index(key).nil?
return unless self[key]
if property.type.is_a?(Array)
klass = ::CouchRest.constantize(property.type[0])
arr = self[key].dup.collect do |value|
value = typecast_value(value, klass, property.init_method)
associate_casted_to_parent(value, assigned)
value
end
write_property(property, value)
end
end
protected
def write_attribute(name, value)
unless (property = property(name)).nil?
write_property(property, value)
self[key] = klass != String ? CastedArray.new(arr) : arr
self[key].casted_by = self if self[key].respond_to?(:casted_by)
else
self[name] = value
end
if property.type.downcase == 'boolean'
klass = TrueClass
else
klass = ::CouchRest.constantize(property.type)
end
def write_property(property, value)
value = property.typecast(value)
value.casted_by = self if value.respond_to?(:casted_by)
self[property.name] = value
self[key] = typecast_value(self[key], klass, property.init_method)
associate_casted_to_parent(self[key], assigned)
end
def property(name)
properties.find {|p| p.name == name.to_s}
end
def associate_casted_to_parent(casted, assigned)
@ -91,21 +75,6 @@ module CouchRest
casted.document_saved = true if !assigned && casted.respond_to?(:document_saved)
end
def convert_property_value(property, klass, value)
if ((property.init_method == 'new') && klass == Time)
# Using custom time parsing method because Ruby's default method is toooo slow
value.is_a?(String) ? Time.mktime_with_offset(value.dup) : value
# Float instances don't get initialized with #new
elsif ((property.init_method == 'new') && klass == Float)
cast_float(value)
# 'boolean' type is simply used to generate a property? accessor method
elsif ((property.init_method == 'new') && klass == TrueClass)
value
else
klass.send(property.init_method, value.dup)
end
end
def cast_property_by_name(property_name)
return unless self.class.properties
property = self.class.properties.detect{|property| property.name == property_name}
@ -113,13 +82,6 @@ module CouchRest
cast_property(property, true)
end
def cast_float(value)
begin
Float(value)
rescue
value
end
end
module ClassMethods
@ -136,7 +98,7 @@ module CouchRest
# make sure to use a mutex.
def define_property(name, options={})
# check if this property is going to casted
options[:casted] = options[:cast_as] ? options[:cast_as] : false
options[:casted] = !!(options[:cast_as] || options[:type])
property = CouchRest::Property.new(name, (options.delete(:cast_as) || options.delete(:type)), options)
create_property_getter(property)
create_property_setter(property) unless property.read_only == true
@ -176,7 +138,8 @@ module CouchRest
property_name = property.name
class_eval <<-EOS
def #{property_name}=(value)
write_attribute('#{property_name}', value)
self['#{property_name}'] = value
cast_property_by_name('#{property_name}')
end
EOS
@ -186,7 +149,9 @@ module CouchRest
EOS
end
end
end # module ClassMethods
end
end
end

169
lib/couchrest/more/property.rb
View file

@ -1,7 +1,3 @@
require 'time'
require 'bigdecimal'
require 'bigdecimal/util'
module CouchRest
# Basic attribute support for adding getter/setter + validation
@ -16,171 +12,6 @@ module CouchRest
self
end
def typecast(value)
do_typecast(value, type, init_method)
end
protected
def do_typecast(value, target, init_method)
return nil if value.nil?
if target == 'String' then typecast_to_string(value)
elsif target == 'Boolean' then typecast_to_boolean(value)
elsif target == 'Integer' then typecast_to_integer(value)
elsif target == 'Float' then typecast_to_float(value)
elsif target == 'BigDecimal' then typecast_to_bigdecimal(value)
elsif target == 'DateTime' then typecast_to_datetime(value)
elsif target == 'Time' then typecast_to_time(value)
elsif target == 'Date' then typecast_to_date(value)
elsif target == 'Class' then typecast_to_class(value)
elsif target.is_a?(Array) then typecast_array(value, target, init_method)
else
@klass ||= ::CouchRest.constantize(target)
value.kind_of?(@klass) ? value : @klass.send(init_method, value.dup)
end
end
def typecast_array(value, target, init_method)
value.map { |v| do_typecast(v, target[0], init_method) }
end
# Typecast a value to an Integer
def typecast_to_integer(value)
value.kind_of?(Integer) ? value : typecast_to_numeric(value, :to_i)
end
# Typecast a value to a String
def typecast_to_string(value)
value.to_s
end
# Typecast a value to a true or false
def typecast_to_boolean(value)
return value if value == true || value == false
if value.kind_of?(Integer)
return true if value == 1
return false if value == 0
elsif value.respond_to?(:to_str)
return true if %w[ true 1 t ].include?(value.to_str.downcase)
return false if %w[ false 0 f ].include?(value.to_str.downcase)
end
value
end
# Typecast a value to a BigDecimal
def typecast_to_bigdecimal(value)
return value if value.kind_of?(BigDecimal)
if value.kind_of?(Integer)
value.to_s.to_d
else
typecast_to_numeric(value, :to_d)
end
end
# Typecast a value to a Float
def typecast_to_float(value)
return value if value.kind_of?(Float)
typecast_to_numeric(value, :to_f)
end
# Match numeric string
def typecast_to_numeric(value, method)
if value.respond_to?(:to_str)
if value.to_str =~ /\A(-?(?:0|[1-9]\d*)(?:\.\d+)?|(?:\.\d+))\z/
$1.send(method)
else
value
end
elsif value.respond_to?(method)
value.send(method)
else
value
end
end
# Typecasts an arbitrary value to a DateTime.
# Handles both Hashes and DateTime instances.
def typecast_to_datetime(value)
return value if value.kind_of?(DateTime)
if value.is_a?(Hash)
typecast_hash_to_datetime(value)
else
DateTime.parse(value.to_s)
end
rescue ArgumentError
value
end
# Typecasts an arbitrary value to a Date
# Handles both Hashes and Date instances.
def typecast_to_date(value)
return value if value.kind_of?(Date)
if value.is_a?(Hash)
typecast_hash_to_date(value)
else
Date.parse(value.to_s)
end
rescue ArgumentError
value
end
# Typecasts an arbitrary value to a Time
# Handles both Hashes and Time instances.
def typecast_to_time(value)
return value if value.kind_of?(Time)
if value.is_a?(Hash)
typecast_hash_to_time(value)
else
Time.mktime_with_offset(value.to_s)
end
rescue ArgumentError
value
rescue TypeError
value
end
# Creates a DateTime instance from a Hash with keys :year, :month, :day,
# :hour, :min, :sec
def typecast_hash_to_datetime(value)
DateTime.new(*extract_time(value))
end
# Creates a Date instance from a Hash with keys :year, :month, :day
def typecast_hash_to_date(value)
Date.new(*extract_time(value)[0, 3])
end
# Creates a Time instance from a Hash with keys :year, :month, :day,
# :hour, :min, :sec
def typecast_hash_to_time(value)
Time.local(*extract_time(value))
end
# Extracts the given args from the hash. If a value does not exist, it
# uses the value of Time.now.
def extract_time(value)
now = Time.now
[:year, :month, :day, :hour, :min, :sec].map do |segment|
typecast_to_numeric(value.fetch(segment, now.send(segment)), :to_i)
end
end
# Typecast a value to a Class
def typecast_to_class(value)
return value if value.kind_of?(Class)
::CouchRest.constantize(value.to_s)
rescue NameError
value
end
private
def parse_type(type)

180
lib/couchrest/more/typecast.rb Normal file
View file

@ -0,0 +1,180 @@
require 'time'
require 'bigdecimal'
require 'bigdecimal/util'
require File.join(File.dirname(__FILE__), '..', 'more', 'property')
class Time
# returns a local time value much faster than Time.parse
def self.mktime_with_offset(string)
string =~ /(\d{4})[\-|\/](\d{2})[\-|\/](\d{2})[T|\s](\d{2}):(\d{2}):(\d{2})([\+|\s|\-])*(\d{2}):?(\d{2})/
# $1 = year
# $2 = month
# $3 = day
# $4 = hours
# $5 = minutes
# $6 = seconds
# $7 = time zone direction
# $8 = tz difference
# utc time with wrong TZ info:
time = mktime($1, RFC2822_MONTH_NAME[$2.to_i - 1], $3, $4, $5, $6, $7)
tz_difference = ("#{$7 == '-' ? '+' : '-'}#{$8}".to_i * 3600)
time + tz_difference + zone_offset(time.zone)
end
end
module CouchRest
module More
module Typecast
def typecast_value(value, klass, init_method)
return nil if value.nil?
if value.instance_of?(klass) || klass.to_s == 'Object'
value
elsif ['String', 'TrueClass', 'Integer', 'Float', 'BigDecimal', 'DateTime', 'Time', 'Date', 'Class'].include?(klass.to_s)
send('typecast_to_'+klass.to_s.downcase, value)
else
# Allow the init_method to be defined as a Proc for advanced conversion
init_method.is_a?(Proc) ? init_method.call(value) : klass.send(init_method, value)
end
end
protected
# Typecast a value to an Integer
def typecast_to_integer(value)
value.kind_of?(Integer) ? value : typecast_to_numeric(value, :to_i)
end
# Typecast a value to a String
def typecast_to_string(value)
value.to_s
end
# Typecast a value to a true or false
def typecast_to_trueclass(value)
if value.kind_of?(Integer)
return true if value == 1
return false if value == 0
elsif value.respond_to?(:to_s)
return true if %w[ true 1 t ].include?(value.to_s.downcase)
return false if %w[ false 0 f ].include?(value.to_s.downcase)
end
value
end
# Typecast a value to a BigDecimal
def typecast_to_bigdecimal(value)
return value if value.kind_of?(BigDecimal)
if value.kind_of?(Integer)
value.to_s.to_d
else
typecast_to_numeric(value, :to_d)
end
end
# Typecast a value to a Float
def typecast_to_float(value)
return value if value.kind_of?(Float)
typecast_to_numeric(value, :to_f)
end
# Match numeric string
def typecast_to_numeric(value, method)
if value.respond_to?(:to_str)
if value.to_str =~ /\A(-?(?:0|[1-9]\d*)(?:\.\d+)?|(?:\.\d+))\z/
$1.send(method)
else
value
end
elsif value.respond_to?(method)
value.send(method)
else
value
end
end
# Typecasts an arbitrary value to a DateTime.
# Handles both Hashes and DateTime instances.
def typecast_to_datetime(value)
return value if value.kind_of?(DateTime)
if value.is_a?(Hash)
typecast_hash_to_datetime(value)
else
DateTime.parse(value.to_s)
end
rescue ArgumentError
value
end
# Typecasts an arbitrary value to a Date
# Handles both Hashes and Date instances.
def typecast_to_date(value)
return value if value.kind_of?(Date)
if value.is_a?(Hash)
typecast_hash_to_date(value)
else
Date.parse(value.to_s)
end
rescue ArgumentError
value
end
# Typecasts an arbitrary value to a Time
# Handles both Hashes and Time instances.
def typecast_to_time(value)
return value if value.kind_of?(Time)
if value.is_a?(Hash)
typecast_hash_to_time(value)
else
Time.mktime_with_offset(value.to_s)
end
rescue ArgumentError
value
rescue TypeError
value
end
# Creates a DateTime instance from a Hash with keys :year, :month, :day,
# :hour, :min, :sec
def typecast_hash_to_datetime(value)
DateTime.new(*extract_time(value))
end
# Creates a Date instance from a Hash with keys :year, :month, :day
def typecast_hash_to_date(value)
Date.new(*extract_time(value)[0, 3])
end
# Creates a Time instance from a Hash with keys :year, :month, :day,
# :hour, :min, :sec
def typecast_hash_to_time(value)
Time.local(*extract_time(value))
end
# Extracts the given args from the hash. If a value does not exist, it
# uses the value of Time.now.
def extract_time(value)
now = Time.now
[:year, :month, :day, :hour, :min, :sec].map do |segment|
typecast_to_numeric(value.fetch(segment, now.send(segment)), :to_i)
end
end
# Typecast a value to a Class
def typecast_to_class(value)
return value if value.kind_of?(Class)
::CouchRest.constantize(value.to_s)
rescue NameError
value
end
end
end
end

2
spec/fixtures/more/course.rb vendored
View file

@ -4,7 +4,7 @@ require File.join(FIXTURE_PATH, 'more', 'person')
class Course < CouchRest::ExtendedDocument
use_database TEST_SERVER.default_database
property :title
property :title, :cast_as => 'String'
property :questions, :cast_as => ['Question']
property :professor, :cast_as => 'Person'
property :participants, :type => ['Object']

1
spec/fixtures/more/event.rb vendored
View file

@ -5,5 +5,4 @@ class Event < CouchRest::ExtendedDocument
property :occurs_at, :cast_as => 'Time', :init_method => 'parse'
property :end_date, :cast_as => 'Date', :init_method => 'parse'
end