couchrest_model/lib/couchrest/validation/validators/numeric_validator.rb

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# Extracted from dm-validations 0.9.10
#
# Copyright (c) 2007 Guy van den Berg
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
module CouchRest
module Validation
##
#
# @author Guy van den Berg
# @since 0.9
class NumericValidator < GenericValidator
def initialize(field_name, options={})
super
@field_name, @options = field_name, options
@options[:integer_only] = false unless @options.has_key?(:integer_only)
end
def call(target)
value = target.send(field_name)
return true if @options[:allow_nil] && value.nil?
value = value.kind_of?(BigDecimal) ? value.to_s('F') : value.to_s
error_message = @options[:message]
precision = @options[:precision]
scale = @options[:scale]
if @options[:integer_only]
return true if value =~ /\A[+-]?\d+\z/
error_message ||= ValidationErrors.default_error_message(:not_an_integer, field_name)
else
# FIXME: if precision and scale are not specified, can we assume that it is an integer?
# probably not, as floating point numbers don't have hard
# defined scale. the scale floats with the length of the
# integral and precision. Ie. if precision = 10 and integral
# portion of the number is 9834 (4 digits), the max scale will
# be 6 (10 - 4). But if the integral length is 1, max scale
# will be (10 - 1) = 9, so 1.234567890.
if precision && scale
#handles both Float when it has scale specified and BigDecimal
if precision > scale && scale > 0
return true if value =~ /\A[+-]?(?:\d{1,#{precision - scale}}|\d{0,#{precision - scale}}\.\d{1,#{scale}})\z/
elsif precision > scale && scale == 0
return true if value =~ /\A[+-]?(?:\d{1,#{precision}}(?:\.0)?)\z/
elsif precision == scale
return true if value =~ /\A[+-]?(?:0(?:\.\d{1,#{scale}})?)\z/
else
raise ArgumentError, "Invalid precision #{precision.inspect} and scale #{scale.inspect} for #{field_name} (value: #{value.inspect} #{value.class})"
end
elsif precision && scale.nil?
# for floats, if scale is not set
#total number of digits is less or equal precision
return true if value.gsub(/[^\d]/, '').length <= precision
#number of digits before decimal == precision, and the number is x.0. same as scale = 0
return true if value =~ /\A[+-]?(?:\d{1,#{precision}}(?:\.0)?)\z/
else
return true if value =~ /\A[+-]?(?:\d+|\d*\.\d+)\z/
end
error_message ||= ValidationErrors.default_error_message(:not_a_number, field_name)
end
add_error(target, error_message, field_name)
# TODO: check the gt, gte, lt, lte, and eq options
return false
end
end # class NumericValidator
module ValidatesIsNumber
# Validate whether a field is numeric
#
def validates_is_number(*fields)
opts = opts_from_validator_args(fields)
add_validator_to_context(opts, fields, CouchRest::Validation::NumericValidator)
end
end # module ValidatesIsNumber
end # module Validation
end # module CouchRest