/
string_builder.rb
74 lines (58 loc) · 1.61 KB
/
string_builder.rb
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module IceCube
class StringBuilder
attr_writer :base
def initialize
@types = {}
end
def piece(type, prefix = nil, suffix = nil)
@types[type] ||= []
end
def to_s
str = @base || ''
res = @types.map do |type, segments|
if f = self.class.formatter(type)
str << ' ' + f.call(segments)
else
next if segments.empty?
str << ' ' + self.class.sentence(segments)
end
end
str
end
class << self
def formatter(type)
@formatters[type]
end
def register_formatter(type, &formatter)
@formatters ||= {}
@formatters[type] = formatter
end
end
class << self
NUMBER_SUFFIX = ['th', 'st', 'nd', 'rd', 'th', 'th', 'th', 'th', 'th', 'th']
SPECIAL_SUFFIX = { 11 => 'th', 12 => 'th', 13 => 'th', 14 => 'th' }
# influenced by ActiveSupport's to_sentence
def sentence(array)
case array.length
when 0 ; ''
when 1 ; array[0].to_s
when 2 ; "#{array[0]} and #{array[1]}"
else ; "#{array[0...-1].join(', ')}, and #{array[-1]}"
end
end
def nice_number(number)
if number == -1
'last'
elsif number < -1
suffix = SPECIAL_SUFFIX.include?(number) ?
SPECIAL_SUFFIX[number] : NUMBER_SUFFIX[number.abs % 10]
number.abs.to_s << suffix << ' to last'
else
suffix = SPECIAL_SUFFIX.include?(number) ?
SPECIAL_SUFFIX[number] : NUMBER_SUFFIX[number.abs % 10]
number.to_s << suffix
end
end
end
end
end