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|
class String
##
# call-seq:
# String.try_convert(obj) -> string or nil
#
# Try to convert <i>obj</i> into a String, using to_str method.
# Returns converted string or nil if <i>obj</i> cannot be converted
# for any reason.
#
# String.try_convert("str") #=> "str"
# String.try_convert(/re/) #=> nil
#
def self.try_convert(obj)
if obj.respond_to?(:to_str)
obj.to_str
else
nil
end
end
##
# call-seq:
# string.clear -> string
#
# Makes string empty.
#
# a = "abcde"
# a.clear #=> ""
#
def clear
self.replace("")
end
##
# call-seq:
# str.lstrip -> new_str
#
# Returns a copy of <i>str</i> with leading whitespace removed. See also
# <code>String#rstrip</code> and <code>String#strip</code>.
#
# " hello ".lstrip #=> "hello "
# "hello".lstrip #=> "hello"
#
def lstrip
a = 0
z = self.size - 1
a += 1 while a <= z and " \f\n\r\t\v".include?(self[a])
(z >= 0) ? self[a..z] : ""
end
##
# call-seq:
# str.rstrip -> new_str
#
# Returns a copy of <i>str</i> with trailing whitespace removed. See also
# <code>String#lstrip</code> and <code>String#strip</code>.
#
# " hello ".rstrip #=> " hello"
# "hello".rstrip #=> "hello"
#
def rstrip
a = 0
z = self.size - 1
z -= 1 while a <= z and " \f\n\r\t\v\0".include?(self[z])
(z >= 0) ? self[a..z] : ""
end
##
# call-seq:
# str.strip -> new_str
#
# Returns a copy of <i>str</i> with leading and trailing whitespace removed.
#
# " hello ".strip #=> "hello"
# "\tgoodbye\r\n".strip #=> "goodbye"
#
def strip
a = 0
z = self.size - 1
a += 1 while a <= z and " \f\n\r\t\v".include?(self[a])
z -= 1 while a <= z and " \f\n\r\t\v\0".include?(self[z])
(z >= 0) ? self[a..z] : ""
end
##
# call-seq:
# str.lstrip! -> self or nil
#
# Removes leading whitespace from <i>str</i>, returning <code>nil</code> if no
# change was made. See also <code>String#rstrip!</code> and
# <code>String#strip!</code>.
#
# " hello ".lstrip #=> "hello "
# "hello".lstrip! #=> nil
#
def lstrip!
raise RuntimeError, "can't modify frozen String" if frozen?
s = self.lstrip
(s == self) ? nil : self.replace(s)
end
##
# call-seq:
# str.rstrip! -> self or nil
#
# Removes trailing whitespace from <i>str</i>, returning <code>nil</code> if
# no change was made. See also <code>String#lstrip!</code> and
# <code>String#strip!</code>.
#
# " hello ".rstrip #=> " hello"
# "hello".rstrip! #=> nil
#
def rstrip!
raise RuntimeError, "can't modify frozen String" if frozen?
s = self.rstrip
(s == self) ? nil : self.replace(s)
end
##
# call-seq:
# str.strip! -> str or nil
#
# Removes leading and trailing whitespace from <i>str</i>. Returns
# <code>nil</code> if <i>str</i> was not altered.
#
def strip!
raise RuntimeError, "can't modify frozen String" if frozen?
s = self.strip
(s == self) ? nil : self.replace(s)
end
##
# call-seq:
# str.casecmp(other_str) -> -1, 0, +1 or nil
#
# Case-insensitive version of <code>String#<=></code>.
#
# "abcdef".casecmp("abcde") #=> 1
# "aBcDeF".casecmp("abcdef") #=> 0
# "abcdef".casecmp("abcdefg") #=> -1
# "abcdef".casecmp("ABCDEF") #=> 0
#
def casecmp(str)
self.downcase <=> str.to_str.downcase
rescue NoMethodError
raise TypeError, "no implicit conversion of #{str.class} into String"
end
def partition(sep)
raise TypeError, "type mismatch: #{sep.class} given" unless sep.is_a? String
n = index(sep)
unless n.nil?
m = n + sep.size
[ slice(0, n), sep, slice(m, size - m) ]
else
[ self, "", "" ]
end
end
def rpartition(sep)
raise TypeError, "type mismatch: #{sep.class} given" unless sep.is_a? String
n = rindex(sep)
unless n.nil?
m = n + sep.size
[ slice(0, n), sep, slice(m, size - m) ]
else
[ "", "", self ]
end
end
##
# call-seq:
# str.slice!(fixnum) -> new_str or nil
# str.slice!(fixnum, fixnum) -> new_str or nil
# str.slice!(range) -> new_str or nil
# str.slice!(other_str) -> new_str or nil
#
# Deletes the specified portion from <i>str</i>, and returns the portion
# deleted.
#
# string = "this is a string"
# string.slice!(2) #=> "i"
# string.slice!(3..6) #=> " is "
# string.slice!("r") #=> "r"
# string #=> "thsa sting"
#
def slice!(arg1, arg2=nil)
raise RuntimeError, "can't modify frozen String" if frozen?
raise "wrong number of arguments (for 1..2)" if arg1.nil? && arg2.nil?
if !arg1.nil? && !arg2.nil?
idx = arg1
idx += self.size if arg1 < 0
if idx >= 0 && idx <= self.size && arg2 > 0
str = self[idx, arg2]
else
return nil
end
else
validated = false
if arg1.kind_of?(Range)
beg = arg1.begin
ed = arg1.end
beg += self.size if beg < 0
ed += self.size if ed < 0
ed -= 1 if arg1.exclude_end?
validated = true
elsif arg1.kind_of?(String)
validated = true
else
idx = arg1
idx += self.size if arg1 < 0
validated = true if idx >=0 && arg1 < self.size
end
if validated
str = self[arg1]
else
return nil
end
end
unless str.nil? || str == ""
if !arg1.nil? && !arg2.nil?
idx = arg1 >= 0 ? arg1 : self.size+arg1
str2 = self[0...idx] + self[idx+arg2..-1].to_s
else
if arg1.kind_of?(Range)
idx = beg >= 0 ? beg : self.size+beg
idx2 = ed>= 0 ? ed : self.size+ed
str2 = self[0...idx] + self[idx2+1..-1].to_s
elsif arg1.kind_of?(String)
idx = self.index(arg1)
str2 = self[0...idx] + self[idx+arg1.size..-1] unless idx.nil?
else
idx = arg1 >= 0 ? arg1 : self.size+arg1
str2 = self[0...idx] + self[idx+1..-1].to_s
end
end
self.replace(str2) unless str2.nil?
end
str
end
##
# call-seq:
# str.insert(index, other_str) -> str
#
# Inserts <i>other_str</i> before the character at the given
# <i>index</i>, modifying <i>str</i>. Negative indices count from the
# end of the string, and insert <em>after</em> the given character.
# The intent is insert <i>aString</i> so that it starts at the given
# <i>index</i>.
#
# "abcd".insert(0, 'X') #=> "Xabcd"
# "abcd".insert(3, 'X') #=> "abcXd"
# "abcd".insert(4, 'X') #=> "abcdX"
# "abcd".insert(-3, 'X') #=> "abXcd"
# "abcd".insert(-1, 'X') #=> "abcdX"
#
def insert(idx, str)
if idx == -1
return self << str
elsif idx < 0
idx += 1
end
self[idx, 0] = str
self
end
##
# call-seq:
# str.ljust(integer, padstr=' ') -> new_str
#
# If <i>integer</i> is greater than the length of <i>str</i>, returns a new
# <code>String</code> of length <i>integer</i> with <i>str</i> left justified
# and padded with <i>padstr</i>; otherwise, returns <i>str</i>.
#
# "hello".ljust(4) #=> "hello"
# "hello".ljust(20) #=> "hello "
# "hello".ljust(20, '1234') #=> "hello123412341234123"
def ljust(idx, padstr = ' ')
raise ArgumentError, 'zero width padding' if padstr == ''
return self if idx <= self.size
pad_repetitions = (idx / padstr.length).ceil
padding = (padstr * pad_repetitions)[0...(idx - self.length)]
self + padding
end
##
# call-seq:
# str.rjust(integer, padstr=' ') -> new_str
#
# If <i>integer</i> is greater than the length of <i>str</i>, returns a new
# <code>String</code> of length <i>integer</i> with <i>str</i> right justified
# and padded with <i>padstr</i>; otherwise, returns <i>str</i>.
#
# "hello".rjust(4) #=> "hello"
# "hello".rjust(20) #=> " hello"
# "hello".rjust(20, '1234') #=> "123412341234123hello"
def rjust(idx, padstr = ' ')
raise ArgumentError, 'zero width padding' if padstr == ''
return self if idx <= self.size
pad_repetitions = (idx / padstr.length).ceil
padding = (padstr * pad_repetitions)[0...(idx - self.length)]
padding + self
end
def chars(&block)
if block_given?
self.split('').each do |i|
block.call(i)
end
self
else
self.split('')
end
end
def each_char(&block)
return to_enum :each_char unless block
split('').each do |i|
block.call(i)
end
self
end
def codepoints(&block)
len = self.size
if block_given?
self.split('').each do|x|
block.call(x.ord)
end
self
else
self.split('').map{|x| x.ord}
end
end
alias each_codepoint codepoints
##
# call-seq:
# str.prepend(other_str) -> str
#
# Prepend---Prepend the given string to <i>str</i>.
#
# a = "world"
# a.prepend("hello ") #=> "hello world"
# a #=> "hello world"
def prepend(arg)
self[0, 0] = arg
self
end
end
|
