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require 'facets/string/splice'
require 'facets/string/scan'
require 'facets/indexable'
class String
include Indexable
# An extraneous feature, but make String more ploymorphic
# with Array.
#
# "HELLO".at(2) #=> "L"
def at(index)
case index
when Fixnum
self[index].chr
else
self[index]
end
end
#Or should this be like #split? or self + '/' + other?
#alias / []
#-----------------------------------------------------------------
# The following methods override Indexable to better suit String.
#-----------------------------------------------------------------
# Returns the first separation of a string.
# Default seperation is by character.
#
# "Hello World".first #=> "H"
# "Hello World".first(' ') #=> "Hello"
#
def first(pattern=//)
case pattern
when Regexp, String
split(pattern).at(0)
else
super
end
end
# Returns the last separation of a string.
# Default separation is by character.
#
# "Hello World".last(' ') #=> "World"
#
def last(pattern=//)
case pattern
when Regexp, String
split(pattern).at(-1)
else
super
end
end
# Removes the first separation from a string.
# Defualt separation is by characters.
#--
# If a zero-length record separator is supplied,
# the string is split on /\n+/. If the record
# separator is set to <tt>nil</tt>, then the
# string is split on characters.
#++
#
# a = "Hello World"
# a.first! #=> "H"
# a #=> "ello World"
#
# a = "Hello World"
# a.first!(' ') #=> "Hello"
# a #=> "World"
#
def first!(pattern=//)
case pattern
when Regexp, String
a = shatter(pattern) # req. scan
r = a.first
a.shift
a.shift
replace( a.join('') )
return r
else
super
end
end
# Removes the last separation from a string.
# Default seperation is by characeter.
#--
# If a zero-length record separator is supplied,
# the string is split on /\n+/. If the record
# separator is set to <tt>nil</tt>, then the
# string is split on characters.
#++
#
# a = "Hello World"
# a.last! #=> "d"
# a #=> "Hello Worl"
#
# a = "Hello World"
# a.last!(' ') #=> "World"
# a #=> "Hello"
#
def last!(pattern=//)
case pattern
when Regexp, String
a = shatter(pattern) #req. scan
r = a.last
a.pop
a.pop
replace(a.join(''))
return r
else
super
end
end
# TODO: Should Strin#first= replace first char as in Indexable?
# Prepends to a string.
#
# "Hello World".first = "Hello," #=> "Hello, Hello World"
def first=(x)
insert(0, x.to_s)
end
# Appends to a string.
#
# "Hello World".last = ", Bye." #=> "Hello World, Bye."
#
def last=(str)
self << str
end
end
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