[270] | 1 | class String
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| 2 |
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| 3 | ##
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| 4 | # call-seq:
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| 5 | # string.clear -> string
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| 6 | #
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| 7 | # Makes string empty.
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| 8 | #
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| 9 | # a = "abcde"
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| 10 | # a.clear #=> ""
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| 11 | #
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| 12 | def clear
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| 13 | self.replace("")
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| 14 | end
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| 15 |
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| 16 | ##
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| 17 | # call-seq:
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| 18 | # str.lstrip -> new_str
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| 19 | #
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| 20 | # Returns a copy of <i>str</i> with leading whitespace removed. See also
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| 21 | # <code>String#rstrip</code> and <code>String#strip</code>.
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| 22 | #
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| 23 | # " hello ".lstrip #=> "hello "
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| 24 | # "hello".lstrip #=> "hello"
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| 25 | #
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| 26 | def lstrip
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| 27 | a = 0
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| 28 | z = self.size - 1
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| 29 | a += 1 while " \f\n\r\t\v".include?(self[a]) and a <= z
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| 30 | (z >= 0) ? self[a..z] : ""
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| 31 | end
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| 32 |
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| 33 | ##
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| 34 | # call-seq:
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| 35 | # str.rstrip -> new_str
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| 36 | #
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| 37 | # Returns a copy of <i>str</i> with trailing whitespace removed. See also
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| 38 | # <code>String#lstrip</code> and <code>String#strip</code>.
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| 39 | #
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| 40 | # " hello ".rstrip #=> " hello"
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| 41 | # "hello".rstrip #=> "hello"
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| 42 | #
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| 43 | def rstrip
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| 44 | a = 0
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| 45 | z = self.size - 1
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| 46 | z -= 1 while " \f\n\r\t\v\0".include?(self[z]) and a <= z
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| 47 | (z >= 0) ? self[a..z] : ""
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| 48 | end
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| 49 |
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| 50 | ##
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| 51 | # call-seq:
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| 52 | # str.strip -> new_str
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| 53 | #
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| 54 | # Returns a copy of <i>str</i> with leading and trailing whitespace removed.
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| 55 | #
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| 56 | # " hello ".strip #=> "hello"
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| 57 | # "\tgoodbye\r\n".strip #=> "goodbye"
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| 58 | #
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| 59 | def strip
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| 60 | a = 0
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| 61 | z = self.size - 1
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| 62 | a += 1 while " \f\n\r\t\v".include?(self[a]) and a <= z
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| 63 | z -= 1 while " \f\n\r\t\v\0".include?(self[z]) and a <= z
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| 64 | (z >= 0) ? self[a..z] : ""
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| 65 | end
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| 66 |
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| 67 | ##
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| 68 | # call-seq:
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| 69 | # str.lstrip! -> self or nil
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| 70 | #
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| 71 | # Removes leading whitespace from <i>str</i>, returning <code>nil</code> if no
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| 72 | # change was made. See also <code>String#rstrip!</code> and
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| 73 | # <code>String#strip!</code>.
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| 74 | #
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| 75 | # " hello ".lstrip #=> "hello "
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| 76 | # "hello".lstrip! #=> nil
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| 77 | #
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| 78 | def lstrip!
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| 79 | s = self.lstrip
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| 80 | (s == self) ? nil : self.replace(s)
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| 81 | end
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| 82 |
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| 83 | ##
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| 84 | # call-seq:
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| 85 | # str.rstrip! -> self or nil
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| 86 | #
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| 87 | # Removes trailing whitespace from <i>str</i>, returning <code>nil</code> if
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| 88 | # no change was made. See also <code>String#lstrip!</code> and
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| 89 | # <code>String#strip!</code>.
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| 90 | #
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| 91 | # " hello ".rstrip #=> " hello"
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| 92 | # "hello".rstrip! #=> nil
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| 93 | #
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| 94 | def rstrip!
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| 95 | s = self.rstrip
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| 96 | (s == self) ? nil : self.replace(s)
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| 97 | end
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| 98 |
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| 99 | ##
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| 100 | # call-seq:
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| 101 | # str.strip! -> str or nil
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| 102 | #
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| 103 | # Removes leading and trailing whitespace from <i>str</i>. Returns
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| 104 | # <code>nil</code> if <i>str</i> was not altered.
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| 105 | #
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| 106 | def strip!
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| 107 | s = self.strip
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| 108 | (s == self) ? nil : self.replace(s)
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| 109 | end
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| 110 |
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| 111 | ##
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| 112 | # call-seq:
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| 113 | # str.casecmp(other_str) -> -1, 0, +1 or nil
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| 114 | #
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| 115 | # Case-insensitive version of <code>String#<=></code>.
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| 116 | #
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| 117 | # "abcdef".casecmp("abcde") #=> 1
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| 118 | # "aBcDeF".casecmp("abcdef") #=> 0
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| 119 | # "abcdef".casecmp("abcdefg") #=> -1
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| 120 | # "abcdef".casecmp("ABCDEF") #=> 0
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| 121 | #
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| 122 | def casecmp(str)
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| 123 | self.downcase <=> str.to_str.downcase
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| 124 | rescue NoMethodError
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| 125 | raise TypeError, "no implicit conversion of #{str.class} into String"
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| 126 | end
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| 127 |
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| 128 | def partition(sep)
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| 129 | raise TypeError, "type mismatch: #{sep.class} given" unless sep.is_a? String
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| 130 | n = index(sep)
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| 131 | unless n.nil?
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| 132 | m = n + sep.size
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| 133 | [ slice(0, n), sep, slice(m, size - m) ]
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| 134 | else
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| 135 | [ self, "", "" ]
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| 136 | end
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| 137 | end
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| 138 |
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| 139 | def rpartition(sep)
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| 140 | raise TypeError, "type mismatch: #{sep.class} given" unless sep.is_a? String
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| 141 | n = rindex(sep)
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| 142 | unless n.nil?
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| 143 | m = n + sep.size
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| 144 | [ slice(0, n), sep, slice(m, size - m) ]
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| 145 | else
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| 146 | [ "", "", self ]
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| 147 | end
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| 148 | end
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| 149 |
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| 150 | ##
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| 151 | # call-seq:
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| 152 | # str.slice!(fixnum) -> new_str or nil
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| 153 | # str.slice!(fixnum, fixnum) -> new_str or nil
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| 154 | # str.slice!(range) -> new_str or nil
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| 155 | # str.slice!(other_str) -> new_str or nil
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| 156 | #
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| 157 | # Deletes the specified portion from <i>str</i>, and returns the portion
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| 158 | # deleted.
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| 159 | #
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| 160 | # string = "this is a string"
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| 161 | # string.slice!(2) #=> "i"
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| 162 | # string.slice!(3..6) #=> " is "
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| 163 | # string.slice!("r") #=> "r"
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| 164 | # string #=> "thsa sting"
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| 165 | #
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| 166 | def slice!(arg1, arg2=nil)
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| 167 | raise "wrong number of arguments (for 1..2)" if arg1.nil? && arg2.nil?
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| 168 |
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| 169 | if !arg1.nil? && !arg2.nil?
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| 170 | idx = arg1
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| 171 | idx += self.size if arg1 < 0
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| 172 | if idx >= 0 && idx <= self.size && arg2 > 0
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| 173 | str = self[idx, arg2]
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| 174 | else
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| 175 | return nil
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| 176 | end
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| 177 | else
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| 178 | validated = false
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| 179 | if arg1.kind_of?(Range)
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| 180 | beg = arg1.begin
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| 181 | ed = arg1.end
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| 182 | beg += self.size if beg < 0
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| 183 | ed += self.size if ed < 0
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| 184 | ed -= 1 if arg1.exclude_end?
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| 185 | validated = true
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| 186 | elsif arg1.kind_of?(String)
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| 187 | validated = true
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| 188 | else
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| 189 | idx = arg1
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| 190 | idx += self.size if arg1 < 0
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| 191 | validated = true if idx >=0 && arg1 < self.size
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| 192 | end
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| 193 | if validated
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| 194 | str = self[arg1]
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| 195 | else
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| 196 | return nil
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| 197 | end
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| 198 | end
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| 199 | unless str.nil? || str == ""
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| 200 | if !arg1.nil? && !arg2.nil?
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| 201 | idx = arg1 >= 0 ? arg1 : self.size+arg1
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| 202 | str2 = self[0...idx] + self[idx+arg2..-1].to_s
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| 203 | else
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| 204 | if arg1.kind_of?(Range)
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| 205 | idx = beg >= 0 ? beg : self.size+beg
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| 206 | idx2 = ed>= 0 ? ed : self.size+ed
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| 207 | str2 = self[0...idx] + self[idx2+1..-1].to_s
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| 208 | elsif arg1.kind_of?(String)
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| 209 | idx = self.index(arg1)
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| 210 | str2 = self[0...idx] + self[idx+arg1.size..-1] unless idx.nil?
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| 211 | else
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| 212 | idx = arg1 >= 0 ? arg1 : self.size+arg1
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| 213 | str2 = self[0...idx] + self[idx+1..-1].to_s
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| 214 | end
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| 215 | end
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| 216 | self.replace(str2) unless str2.nil?
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| 217 | end
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| 218 | str
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| 219 | end
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| 220 |
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| 221 | ##
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| 222 | # call-seq:
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| 223 | # str.insert(index, other_str) -> str
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| 224 | #
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| 225 | # Inserts <i>other_str</i> before the character at the given
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| 226 | # <i>index</i>, modifying <i>str</i>. Negative indices count from the
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| 227 | # end of the string, and insert <em>after</em> the given character.
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| 228 | # The intent is insert <i>aString</i> so that it starts at the given
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| 229 | # <i>index</i>.
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| 230 | #
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| 231 | # "abcd".insert(0, 'X') #=> "Xabcd"
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| 232 | # "abcd".insert(3, 'X') #=> "abcXd"
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| 233 | # "abcd".insert(4, 'X') #=> "abcdX"
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| 234 | # "abcd".insert(-3, 'X') #=> "abXcd"
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| 235 | # "abcd".insert(-1, 'X') #=> "abcdX"
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| 236 | #
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| 237 | def insert(idx, str)
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| 238 | pos = idx.to_i
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| 239 | pos += self.size + 1 if pos < 0
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| 240 |
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| 241 | raise IndexError, "index #{idx.to_i} out of string" if pos < 0 || pos > self.size
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| 242 |
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| 243 | return self + str if pos == -1
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| 244 | return str + self if pos == 0
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| 245 | return self[0..pos - 1] + str + self[pos..-1]
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| 246 | end
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| 247 |
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| 248 | ##
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| 249 | # call-seq:
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| 250 | # str.ljust(integer, padstr=' ') -> new_str
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| 251 | #
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| 252 | # If <i>integer</i> is greater than the length of <i>str</i>, returns a new
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| 253 | # <code>String</code> of length <i>integer</i> with <i>str</i> left justified
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| 254 | # and padded with <i>padstr</i>; otherwise, returns <i>str</i>.
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| 255 | #
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| 256 | # "hello".ljust(4) #=> "hello"
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| 257 | # "hello".ljust(20) #=> "hello "
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| 258 | # "hello".ljust(20, '1234') #=> "hello123412341234123"
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| 259 | def ljust(idx, padstr = ' ')
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| 260 | if idx <= self.size
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| 261 | return self
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| 262 | end
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| 263 | newstr = self.dup
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| 264 | newstr << padstr
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| 265 | while newstr.size <= idx
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| 266 | newstr << padstr
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| 267 | end
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| 268 | return newstr.slice(0,idx)
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| 269 | end
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| 270 |
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| 271 | # str.upto(other_str, exclusive=false) {|s| block } -> str
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| 272 | # str.upto(other_str, exclusive=false) -> an_enumerator
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| 273 | #
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| 274 | # Iterates through successive values, starting at <i>str</i> and
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| 275 | # ending at <i>other_str</i> inclusive, passing each value in turn to
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| 276 | # the block. The <code>String#succ</code> method is used to generate
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| 277 | # each value. If optional second argument exclusive is omitted or is false,
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| 278 | # the last value will be included; otherwise it will be excluded.
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| 279 | #
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| 280 | # If no block is given, an enumerator is returned instead.
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| 281 | #
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| 282 | # "a8".upto("b6") {|s| print s, ' ' }
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| 283 | # for s in "a8".."b6"
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| 284 | # print s, ' '
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| 285 | # end
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| 286 | #
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| 287 | # <em>produces:</em>
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| 288 | #
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| 289 | # a8 a9 b0 b1 b2 b3 b4 b5 b6
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| 290 | # a8 a9 b0 b1 b2 b3 b4 b5 b6
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| 291 | #
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| 292 | # If <i>str</i> and <i>other_str</i> contains only ascii numeric characters,
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| 293 | # both are recognized as decimal numbers. In addition, the width of
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| 294 | # string (e.g. leading zeros) is handled appropriately.
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| 295 | #
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| 296 | # "9".upto("11").to_a #=> ["9", "10", "11"]
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| 297 | # "25".upto("5").to_a #=> []
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| 298 | # "07".upto("11").to_a #=> ["07", "08", "09", "10", "11"]
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| 299 | #
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| 300 | def upto(other_str, excl=false, &block)
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| 301 | return to_enum :upto, other_str, excl unless block
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| 302 |
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| 303 | str = self
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| 304 | n = self.<=>other_str
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| 305 | return self if n > 0 || (self == other_str && excl)
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| 306 | while true
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| 307 | block.call(str)
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| 308 | return self if !excl && str == other_str
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| 309 | str = str.succ
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| 310 | return self if excl && str == other_str
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| 311 | end
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| 312 | end
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| 313 |
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| 314 | def chars(&block)
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| 315 | if block_given?
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| 316 | self.split('').map do |i|
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| 317 | block.call(i)
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| 318 | end
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| 319 | self
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| 320 | else
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| 321 | self.split('')
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| 322 | end
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| 323 | end
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| 324 | alias each_char chars
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| 325 |
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| 326 | def codepoints(&block)
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| 327 | len = self.size
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| 328 |
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| 329 | if block_given?
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| 330 | self.split('').map do|x|
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| 331 | block.call(x.ord)
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| 332 | end
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| 333 | self
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| 334 | else
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| 335 | self.split('').map{|x| x.ord}
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| 336 | end
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| 337 | end
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| 338 | alias each_codepoint codepoints
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| 339 | end
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