[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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[331] | 12 | def each_line(rs = "\n", &block)
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| 13 | return to_enum(:each_line, rs, &block) unless block
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| 14 | return block.call(self) if rs.nil?
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| 15 | rs = rs.to_str
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[270] | 16 | offset = 0
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[331] | 17 | rs_len = rs.length
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| 18 | this = dup
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| 19 | while pos = this.index(rs, offset)
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| 20 | block.call(this[offset, pos + rs_len - offset])
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| 21 | offset = pos + rs_len
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[270] | 22 | end
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[331] | 23 | block.call(this[offset, this.size - offset]) if this.size > offset
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[270] | 24 | self
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| 25 | end
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| 26 |
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| 27 | # private method for gsub/sub
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| 28 | def __sub_replace(pre, m, post)
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| 29 | s = ""
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| 30 | i = 0
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| 31 | while j = index("\\", i)
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| 32 | break if j == length-1
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| 33 | t = case self[j+1]
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| 34 | when "\\"
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| 35 | "\\"
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| 36 | when "`"
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| 37 | pre
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| 38 | when "&", "0"
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| 39 | m
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| 40 | when "'"
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| 41 | post
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[331] | 42 | when "1", "2", "3", "4", "5", "6", "7", "8", "9"
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| 43 | ""
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[270] | 44 | else
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| 45 | self[j, 2]
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| 46 | end
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| 47 | s += self[i, j-i] + t
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| 48 | i = j + 2
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| 49 | end
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| 50 | s + self[i, length-i]
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| 51 | end
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| 52 |
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| 53 | ##
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| 54 | # Replace all matches of +pattern+ with +replacement+.
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| 55 | # Call block (if given) for each match and replace
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| 56 | # +pattern+ with the value of the block. Return the
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| 57 | # final value.
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| 58 | #
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| 59 | # ISO 15.2.10.5.18
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| 60 | def gsub(*args, &block)
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[331] | 61 | return to_enum(:gsub, *args) if args.length == 1 && !block
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| 62 | raise ArgumentError, "wrong number of arguments" unless (1..2).include?(args.length)
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| 63 |
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| 64 | pattern, replace = *args
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| 65 | plen = pattern.length
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| 66 | if args.length == 2 && block
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| 67 | block = nil
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| 68 | end
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| 69 | if !replace.nil? || !block
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| 70 | replace = replace.to_str
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| 71 | end
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| 72 | offset = 0
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| 73 | result = []
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| 74 | while found = index(pattern, offset)
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| 75 | result << self[offset, found - offset]
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| 76 | offset = found + plen
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| 77 | result << if block
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| 78 | block.call(pattern).to_s
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| 79 | else
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| 80 | replace.__sub_replace(self[0, found], pattern, self[offset..-1] || "")
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[270] | 81 | end
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[331] | 82 | if plen == 0
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| 83 | result << self[offset, 1]
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| 84 | offset += 1
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| 85 | end
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[270] | 86 | end
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[331] | 87 | result << self[offset..-1] if offset < length
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| 88 | result.join
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[270] | 89 | end
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| 90 |
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| 91 | ##
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| 92 | # Replace all matches of +pattern+ with +replacement+.
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| 93 | # Call block (if given) for each match and replace
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| 94 | # +pattern+ with the value of the block. Modify
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| 95 | # +self+ with the final value.
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| 96 | #
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| 97 | # ISO 15.2.10.5.19
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| 98 | def gsub!(*args, &block)
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[331] | 99 | raise RuntimeError, "can't modify frozen String" if frozen?
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| 100 | return to_enum(:gsub!, *args) if args.length == 1 && !block
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[270] | 101 | str = self.gsub(*args, &block)
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| 102 | return nil if str == self
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| 103 | self.replace(str)
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| 104 | end
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| 105 |
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| 106 | ##
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| 107 | # Calls the given block for each match of +pattern+
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| 108 | # If no block is given return an array with all
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| 109 | # matches of +pattern+.
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| 110 | #
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| 111 | # ISO 15.2.10.5.32
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| 112 | def scan(reg, &block)
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| 113 | ### *** TODO *** ###
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| 114 | unless Object.const_defined?(:Regexp)
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| 115 | raise NotImplementedError, "scan not available (yet)"
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| 116 | end
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| 117 | end
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| 118 |
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| 119 | ##
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| 120 | # Replace only the first match of +pattern+ with
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| 121 | # +replacement+. Call block (if given) for each
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| 122 | # match and replace +pattern+ with the value of the
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| 123 | # block. Return the final value.
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| 124 | #
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| 125 | # ISO 15.2.10.5.36
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| 126 | def sub(*args, &block)
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[331] | 127 | unless (1..2).include?(args.length)
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| 128 | raise ArgumentError, "wrong number of arguments (given #{args.length}, expected 2)"
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| 129 | end
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| 130 |
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| 131 | pattern, replace = *args
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| 132 | pattern = pattern.to_str
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| 133 | if args.length == 2 && block
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| 134 | block = nil
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| 135 | end
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| 136 | if !block
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| 137 | replace = replace.to_str
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| 138 | end
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| 139 | result = []
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| 140 | this = dup
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| 141 | found = index(pattern)
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| 142 | return this unless found
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| 143 | result << this[0, found]
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| 144 | offset = found + pattern.length
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| 145 | result << if block
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| 146 | block.call(pattern).to_s
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[270] | 147 | else
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[331] | 148 | replace.__sub_replace(this[0, found], pattern, this[offset..-1] || "")
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[270] | 149 | end
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[331] | 150 | result << this[offset..-1] if offset < length
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| 151 | result.join
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[270] | 152 | end
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| 153 |
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| 154 | ##
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| 155 | # Replace only the first match of +pattern+ with
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| 156 | # +replacement+. Call block (if given) for each
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| 157 | # match and replace +pattern+ with the value of the
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| 158 | # block. Modify +self+ with the final value.
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| 159 | #
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| 160 | # ISO 15.2.10.5.37
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| 161 | def sub!(*args, &block)
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[331] | 162 | raise RuntimeError, "can't modify frozen String" if frozen?
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[270] | 163 | str = self.sub(*args, &block)
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| 164 | return nil if str == self
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| 165 | self.replace(str)
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| 166 | end
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| 167 |
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| 168 | ##
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| 169 | # Call the given block for each character of
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| 170 | # +self+.
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| 171 | def each_char(&block)
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| 172 | pos = 0
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| 173 | while pos < self.size
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| 174 | block.call(self[pos])
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| 175 | pos += 1
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| 176 | end
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| 177 | self
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| 178 | end
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| 179 |
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| 180 | ##
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| 181 | # Call the given block for each byte of +self+.
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| 182 | def each_byte(&block)
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| 183 | bytes = self.bytes
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| 184 | pos = 0
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| 185 | while pos < bytes.size
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| 186 | block.call(bytes[pos])
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| 187 | pos += 1
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| 188 | end
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| 189 | self
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| 190 | end
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| 191 |
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| 192 | ##
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| 193 | # Modify +self+ by replacing the content of +self+.
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| 194 | # The portion of the string affected is determined using the same criteria as +String#[]+.
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| 195 | def []=(*args)
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| 196 | anum = args.size
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| 197 | if anum == 2
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| 198 | pos, value = args
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[331] | 199 | case pos
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| 200 | when String
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[270] | 201 | posnum = self.index(pos)
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| 202 | if posnum
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| 203 | b = self[0, posnum.to_i]
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| 204 | a = self[(posnum + pos.length)..-1]
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| 205 | self.replace([b, value, a].join(''))
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| 206 | else
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| 207 | raise IndexError, "string not matched"
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| 208 | end
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[331] | 209 | when Range
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| 210 | head = pos.begin
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| 211 | tail = pos.end
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| 212 | tail += self.length if tail < 0
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| 213 | unless pos.exclude_end?
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| 214 | tail += 1
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| 215 | end
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| 216 | return self[head, tail-head]=value
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[270] | 217 | else
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| 218 | pos += self.length if pos < 0
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| 219 | if pos < 0 || pos > self.length
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| 220 | raise IndexError, "index #{args[0]} out of string"
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| 221 | end
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| 222 | b = self[0, pos.to_i]
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| 223 | a = self[pos + 1..-1]
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| 224 | self.replace([b, value, a].join(''))
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| 225 | end
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[331] | 226 | return value
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[270] | 227 | elsif anum == 3
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| 228 | pos, len, value = args
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| 229 | pos += self.length if pos < 0
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| 230 | if pos < 0 || pos > self.length
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| 231 | raise IndexError, "index #{args[0]} out of string"
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| 232 | end
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| 233 | if len < 0
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| 234 | raise IndexError, "negative length #{len}"
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| 235 | end
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| 236 | b = self[0, pos.to_i]
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| 237 | a = self[pos + len..-1]
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| 238 | self.replace([b, value, a].join(''))
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| 239 | return value
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| 240 | else
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| 241 | raise ArgumentError, "wrong number of arguments (#{anum} for 2..3)"
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| 242 | end
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| 243 | end
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| 244 |
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| 245 | ##
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| 246 | # ISO 15.2.10.5.3
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| 247 | def =~(re)
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| 248 | raise TypeError, "type mismatch: String given" if re.respond_to? :to_str
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| 249 | re =~ self
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| 250 | end
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| 251 |
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| 252 | ##
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| 253 | # ISO 15.2.10.5.27
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| 254 | def match(re, &block)
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| 255 | if re.respond_to? :to_str
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| 256 | if Object.const_defined?(:Regexp)
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| 257 | r = Regexp.new(re)
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| 258 | r.match(self, &block)
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| 259 | else
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| 260 | raise NotImplementedError, "String#match needs Regexp class"
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| 261 | end
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| 262 | else
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| 263 | re.match(self, &block)
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| 264 | end
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| 265 | end
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| 266 | end
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| 267 |
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| 268 | ##
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| 269 | # String is comparable
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| 270 | #
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| 271 | # ISO 15.2.10.3
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| 272 | module Comparable; end
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| 273 | class String
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| 274 | include Comparable
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| 275 | end
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