[270] | 1 | ##
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| 2 | # String
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| 3 | #
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| 4 | # ISO 15.2.10
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| 5 | class String
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| 6 | include Comparable
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| 7 | ##
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| 8 | # Calls the given block for each line
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| 9 | # and pass the respective line.
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| 10 | #
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| 11 | # ISO 15.2.10.5.15
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| 12 | def each_line(&block)
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| 13 | offset = 0
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| 14 | while pos = self.index("\n", offset)
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| 15 | block.call(self[offset, pos + 1 - offset])
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| 16 | offset = pos + 1
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| 17 | end
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| 18 | block.call(self[offset, self.size - offset]) if self.size > offset
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| 19 | self
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| 20 | end
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| 21 |
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| 22 | # private method for gsub/sub
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| 23 | def __sub_replace(pre, m, post)
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| 24 | s = ""
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| 25 | i = 0
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| 26 | while j = index("\\", i)
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| 27 | break if j == length-1
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| 28 | t = case self[j+1]
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| 29 | when "\\"
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| 30 | "\\"
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| 31 | when "`"
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| 32 | pre
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| 33 | when "&", "0"
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| 34 | m
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| 35 | when "'"
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| 36 | post
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| 37 | else
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| 38 | self[j, 2]
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| 39 | end
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| 40 | s += self[i, j-i] + t
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| 41 | i = j + 2
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| 42 | end
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| 43 | s + self[i, length-i]
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| 44 | end
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| 45 |
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| 46 | ##
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| 47 | # Replace all matches of +pattern+ with +replacement+.
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| 48 | # Call block (if given) for each match and replace
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| 49 | # +pattern+ with the value of the block. Return the
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| 50 | # final value.
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| 51 | #
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| 52 | # ISO 15.2.10.5.18
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| 53 | def gsub(*args, &block)
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| 54 | if args.size == 2
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| 55 | s = ""
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| 56 | i = 0
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| 57 | while j = index(args[0], i)
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| 58 | seplen = args[0].length
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| 59 | k = j + seplen
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| 60 | pre = self[0, j]
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| 61 | post = self[k, length-k]
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| 62 | s += self[i, j-i] + args[1].__sub_replace(pre, args[0], post)
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| 63 | i = k
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| 64 | end
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| 65 | s + self[i, length-i]
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| 66 | elsif args.size == 1 && block
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| 67 | split(args[0], -1).join(block.call(args[0]))
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| 68 | else
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| 69 | raise ArgumentError, "wrong number of arguments"
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| 70 | end
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| 71 | end
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| 72 |
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| 73 | ##
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| 74 | # Replace all matches of +pattern+ with +replacement+.
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| 75 | # Call block (if given) for each match and replace
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| 76 | # +pattern+ with the value of the block. Modify
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| 77 | # +self+ with the final value.
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| 78 | #
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| 79 | # ISO 15.2.10.5.19
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| 80 | def gsub!(*args, &block)
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| 81 | str = self.gsub(*args, &block)
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| 82 | return nil if str == self
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| 83 | self.replace(str)
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| 84 | end
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| 85 |
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| 86 | ##
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| 87 | # Calls the given block for each match of +pattern+
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| 88 | # If no block is given return an array with all
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| 89 | # matches of +pattern+.
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| 90 | #
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| 91 | # ISO 15.2.10.5.32
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| 92 | def scan(reg, &block)
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| 93 | ### *** TODO *** ###
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| 94 | unless Object.const_defined?(:Regexp)
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| 95 | raise NotImplementedError, "scan not available (yet)"
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| 96 | end
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| 97 | end
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| 98 |
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| 99 | ##
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| 100 | # Replace only the first match of +pattern+ with
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| 101 | # +replacement+. Call block (if given) for each
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| 102 | # match and replace +pattern+ with the value of the
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| 103 | # block. Return the final value.
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| 104 | #
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| 105 | # ISO 15.2.10.5.36
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| 106 | def sub(*args, &block)
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| 107 | if args.size == 2
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| 108 | pre, post = split(args[0], 2)
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| 109 | return self unless post # The sub target wasn't found in the string
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| 110 | pre + args[1].__sub_replace(pre, args[0], post) + post
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| 111 | elsif args.size == 1 && block
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| 112 | split(args[0], 2).join(block.call(args[0]))
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| 113 | else
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| 114 | raise ArgumentError, "wrong number of arguments"
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| 115 | end
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| 116 | end
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| 117 |
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| 118 | ##
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| 119 | # Replace only the first match of +pattern+ with
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| 120 | # +replacement+. Call block (if given) for each
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| 121 | # match and replace +pattern+ with the value of the
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| 122 | # block. Modify +self+ with the final value.
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| 123 | #
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| 124 | # ISO 15.2.10.5.37
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| 125 | def sub!(*args, &block)
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| 126 | str = self.sub(*args, &block)
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| 127 | return nil if str == self
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| 128 | self.replace(str)
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| 129 | end
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| 130 |
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| 131 | ##
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| 132 | # Call the given block for each character of
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| 133 | # +self+.
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| 134 | def each_char(&block)
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| 135 | pos = 0
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| 136 | while pos < self.size
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| 137 | block.call(self[pos])
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| 138 | pos += 1
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| 139 | end
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| 140 | self
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| 141 | end
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| 142 |
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| 143 | ##
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| 144 | # Call the given block for each byte of +self+.
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| 145 | def each_byte(&block)
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| 146 | bytes = self.bytes
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| 147 | pos = 0
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| 148 | while pos < bytes.size
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| 149 | block.call(bytes[pos])
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| 150 | pos += 1
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| 151 | end
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| 152 | self
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| 153 | end
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| 154 |
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| 155 | ##
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| 156 | # Modify +self+ by replacing the content of +self+.
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| 157 | # The portion of the string affected is determined using the same criteria as +String#[]+.
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| 158 | def []=(*args)
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| 159 | anum = args.size
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| 160 | if anum == 2
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| 161 | pos, value = args
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| 162 | if pos.kind_of? String
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| 163 | posnum = self.index(pos)
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| 164 | if posnum
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| 165 | b = self[0, posnum.to_i]
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| 166 | a = self[(posnum + pos.length)..-1]
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| 167 | self.replace([b, value, a].join(''))
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| 168 | return value
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| 169 | else
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| 170 | raise IndexError, "string not matched"
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| 171 | end
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| 172 | else
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| 173 | pos += self.length if pos < 0
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| 174 | if pos < 0 || pos > self.length
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| 175 | raise IndexError, "index #{args[0]} out of string"
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| 176 | end
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| 177 | b = self[0, pos.to_i]
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| 178 | a = self[pos + 1..-1]
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| 179 | self.replace([b, value, a].join(''))
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| 180 | return value
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| 181 | end
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| 182 | elsif anum == 3
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| 183 | pos, len, value = args
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| 184 | pos += self.length if pos < 0
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| 185 | if pos < 0 || pos > self.length
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| 186 | raise IndexError, "index #{args[0]} out of string"
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| 187 | end
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| 188 | if len < 0
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| 189 | raise IndexError, "negative length #{len}"
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| 190 | end
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| 191 | b = self[0, pos.to_i]
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| 192 | a = self[pos + len..-1]
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| 193 | self.replace([b, value, a].join(''))
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| 194 | return value
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| 195 | else
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| 196 | raise ArgumentError, "wrong number of arguments (#{anum} for 2..3)"
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| 197 | end
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| 198 | end
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| 199 |
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| 200 | ##
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| 201 | # ISO 15.2.10.5.3
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| 202 | def =~(re)
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| 203 | raise TypeError, "type mismatch: String given" if re.respond_to? :to_str
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| 204 | re =~ self
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| 205 | end
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| 206 |
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| 207 | ##
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| 208 | # ISO 15.2.10.5.27
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| 209 | def match(re, &block)
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| 210 | if re.respond_to? :to_str
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| 211 | if Object.const_defined?(:Regexp)
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| 212 | r = Regexp.new(re)
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| 213 | r.match(self, &block)
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| 214 | else
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| 215 | raise NotImplementedError, "String#match needs Regexp class"
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| 216 | end
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| 217 | else
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| 218 | re.match(self, &block)
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| 219 | end
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| 220 | end
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| 221 | end
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| 222 |
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| 223 | ##
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| 224 | # String is comparable
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| 225 | #
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| 226 | # ISO 15.2.10.3
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| 227 | module Comparable; end
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| 228 | class String
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| 229 | include Comparable
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| 230 | end
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