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tag: v3.1.1
100 lines (90 sloc) 2.277 kb
require "active_support/multibyte"
class String
unless '1.9'.respond_to?(:force_encoding)
# Returns the character at the +position+ treating the string as an array (where 0 is the first character).
#
# Examples:
# "hello".at(0) # => "h"
# "hello".at(4) # => "o"
# "hello".at(10) # => ERROR if < 1.9, nil in 1.9
def at(position)
mb_chars[position, 1].to_s
end
# Returns the remaining of the string from the +position+ treating the string as an array (where 0 is the first character).
#
# Examples:
# "hello".from(0) # => "hello"
# "hello".from(2) # => "llo"
# "hello".from(10) # => "" if < 1.9, nil in 1.9
def from(position)
mb_chars[position..-1].to_s
end
# Returns the beginning of the string up to the +position+ treating the string as an array (where 0 is the first character).
#
# Examples:
# "hello".to(0) # => "h"
# "hello".to(2) # => "hel"
# "hello".to(10) # => "hello"
def to(position)
mb_chars[0..position].to_s
end
# Returns the first character of the string or the first +limit+ characters.
#
# Examples:
# "hello".first # => "h"
# "hello".first(2) # => "he"
# "hello".first(10) # => "hello"
def first(limit = 1)
if limit == 0
''
elsif limit >= size
self
else
mb_chars[0...limit].to_s
end
end
# Returns the last character of the string or the last +limit+ characters.
#
# Examples:
# "hello".last # => "o"
# "hello".last(2) # => "lo"
# "hello".last(10) # => "hello"
def last(limit = 1)
if limit == 0
''
elsif limit >= size
self
else
mb_chars[(-limit)..-1].to_s
end
end
else
def at(position)
self[position]
end
def from(position)
self[position..-1]
end
def to(position)
self[0..position]
end
def first(limit = 1)
if limit == 0
''
elsif limit >= size
self
else
to(limit - 1)
end
end
def last(limit = 1)
if limit == 0
''
elsif limit >= size
self
else
from(-limit)
end
end
end
end
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