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|
class String
##
# 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 " \f\n\r\t\v".include?(self[a]) and a <= z
(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 " \f\n\r\t\v\0".include?(self[z]) and a <= 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 " \f\n\r\t\v".include?(self[a]) and a <= z
z -= 1 while " \f\n\r\t\v\0".include?(self[z]) and a <= 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!
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!
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!
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 "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
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]
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]
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]
end
end
self.replace(str2) unless str2 == nil
end
str
end
end
|
