[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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[439] | 6 | # ISO 15.2.10.3
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[270] | 7 | include Comparable
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[439] | 8 |
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[270] | 9 | ##
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| 10 | # Calls the given block for each line
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| 11 | # and pass the respective line.
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| 12 | #
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| 13 | # ISO 15.2.10.5.15
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[439] | 14 | def each_line(separator = "\n", &block)
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| 15 | return to_enum(:each_line, separator) unless block
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| 16 |
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| 17 | if separator.nil?
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| 18 | block.call(self)
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| 19 | return self
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[270] | 20 | end
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[439] | 21 | raise TypeError unless separator.is_a?(String)
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| 22 |
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| 23 | paragraph_mode = false
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| 24 | if separator.empty?
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| 25 | paragraph_mode = true
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| 26 | separator = "\n\n"
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| 27 | end
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| 28 | start = 0
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| 29 | string = dup
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| 30 | self_len = length
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| 31 | sep_len = separator.length
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| 32 | should_yield_subclass_instances = self.class != String
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| 33 |
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| 34 | while (pointer = string.index(separator, start))
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| 35 | pointer += sep_len
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| 36 | pointer += 1 while paragraph_mode && string[pointer] == "\n"
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| 37 | if should_yield_subclass_instances
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| 38 | block.call(self.class.new(string[start, pointer - start]))
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| 39 | else
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| 40 | block.call(string[start, pointer - start])
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| 41 | end
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| 42 | start = pointer
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| 43 | end
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| 44 | return self if start == self_len
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| 45 |
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| 46 | if should_yield_subclass_instances
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| 47 | block.call(self.class.new(string[start, self_len - start]))
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| 48 | else
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| 49 | block.call(string[start, self_len - start])
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| 50 | end
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[270] | 51 | self
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| 52 | end
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| 53 |
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| 54 | # private method for gsub/sub
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| 55 | def __sub_replace(pre, m, post)
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| 56 | s = ""
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| 57 | i = 0
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| 58 | while j = index("\\", i)
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| 59 | break if j == length-1
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| 60 | t = case self[j+1]
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| 61 | when "\\"
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| 62 | "\\"
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| 63 | when "`"
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| 64 | pre
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| 65 | when "&", "0"
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| 66 | m
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| 67 | when "'"
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| 68 | post
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[331] | 69 | when "1", "2", "3", "4", "5", "6", "7", "8", "9"
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| 70 | ""
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[270] | 71 | else
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| 72 | self[j, 2]
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| 73 | end
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| 74 | s += self[i, j-i] + t
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| 75 | i = j + 2
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| 76 | end
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| 77 | s + self[i, length-i]
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| 78 | end
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| 79 |
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| 80 | ##
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| 81 | # Replace all matches of +pattern+ with +replacement+.
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| 82 | # Call block (if given) for each match and replace
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| 83 | # +pattern+ with the value of the block. Return the
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| 84 | # final value.
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| 85 | #
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| 86 | # ISO 15.2.10.5.18
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| 87 | def gsub(*args, &block)
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[331] | 88 | return to_enum(:gsub, *args) if args.length == 1 && !block
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| 89 | raise ArgumentError, "wrong number of arguments" unless (1..2).include?(args.length)
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| 90 |
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| 91 | pattern, replace = *args
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| 92 | plen = pattern.length
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| 93 | if args.length == 2 && block
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| 94 | block = nil
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| 95 | end
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| 96 | if !replace.nil? || !block
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[439] | 97 | replace.__to_str
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[331] | 98 | end
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| 99 | offset = 0
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| 100 | result = []
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| 101 | while found = index(pattern, offset)
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| 102 | result << self[offset, found - offset]
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| 103 | offset = found + plen
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| 104 | result << if block
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| 105 | block.call(pattern).to_s
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| 106 | else
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| 107 | replace.__sub_replace(self[0, found], pattern, self[offset..-1] || "")
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[270] | 108 | end
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[331] | 109 | if plen == 0
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| 110 | result << self[offset, 1]
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| 111 | offset += 1
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| 112 | end
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[270] | 113 | end
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[331] | 114 | result << self[offset..-1] if offset < length
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| 115 | result.join
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[270] | 116 | end
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| 117 |
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| 118 | ##
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| 119 | # Replace all matches of +pattern+ with +replacement+.
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| 120 | # Call block (if given) for each match and replace
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| 121 | # +pattern+ with the value of the block. Modify
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| 122 | # +self+ with the final value.
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| 123 | #
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| 124 | # ISO 15.2.10.5.19
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| 125 | def gsub!(*args, &block)
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[439] | 126 | raise FrozenError, "can't modify frozen String" if frozen?
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[331] | 127 | return to_enum(:gsub!, *args) if args.length == 1 && !block
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[270] | 128 | str = self.gsub(*args, &block)
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[439] | 129 | return nil unless self.index(args[0])
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[270] | 130 | self.replace(str)
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| 131 | end
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| 132 |
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[439] | 133 | # ##
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| 134 | # # Calls the given block for each match of +pattern+
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| 135 | # # If no block is given return an array with all
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| 136 | # # matches of +pattern+.
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[270] | 137 | ##
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[439] | 138 | # # ISO 15.2.10.5.32
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| 139 | # def scan(pattern, &block)
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| 140 | # # TODO: String#scan is not implemented yet
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| 141 | # end
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[270] | 142 |
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| 143 | ##
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| 144 | # Replace only the first match of +pattern+ with
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| 145 | # +replacement+. Call block (if given) for each
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| 146 | # match and replace +pattern+ with the value of the
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| 147 | # block. Return the final value.
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| 148 | #
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| 149 | # ISO 15.2.10.5.36
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| 150 | def sub(*args, &block)
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[331] | 151 | unless (1..2).include?(args.length)
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| 152 | raise ArgumentError, "wrong number of arguments (given #{args.length}, expected 2)"
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| 153 | end
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| 154 |
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| 155 | pattern, replace = *args
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[439] | 156 | pattern.__to_str
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[331] | 157 | if args.length == 2 && block
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| 158 | block = nil
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| 159 | end
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[439] | 160 | unless block
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| 161 | replace.__to_str
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[331] | 162 | end
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| 163 | result = []
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| 164 | this = dup
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| 165 | found = index(pattern)
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| 166 | return this unless found
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| 167 | result << this[0, found]
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| 168 | offset = found + pattern.length
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| 169 | result << if block
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| 170 | block.call(pattern).to_s
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[270] | 171 | else
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[331] | 172 | replace.__sub_replace(this[0, found], pattern, this[offset..-1] || "")
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[270] | 173 | end
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[331] | 174 | result << this[offset..-1] if offset < length
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| 175 | result.join
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[270] | 176 | end
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| 177 |
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| 178 | ##
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| 179 | # Replace only the first match of +pattern+ with
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| 180 | # +replacement+. Call block (if given) for each
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| 181 | # match and replace +pattern+ with the value of the
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| 182 | # block. Modify +self+ with the final value.
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| 183 | #
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| 184 | # ISO 15.2.10.5.37
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| 185 | def sub!(*args, &block)
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[439] | 186 | raise FrozenError, "can't modify frozen String" if frozen?
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[270] | 187 | str = self.sub(*args, &block)
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[439] | 188 | return nil unless self.index(args[0])
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[270] | 189 | self.replace(str)
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| 190 | end
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| 191 |
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| 192 | ##
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| 193 | # Call the given block for each byte of +self+.
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| 194 | def each_byte(&block)
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[439] | 195 | return to_enum(:each_byte, &block) unless block
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[270] | 196 | bytes = self.bytes
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| 197 | pos = 0
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| 198 | while pos < bytes.size
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| 199 | block.call(bytes[pos])
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| 200 | pos += 1
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| 201 | end
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| 202 | self
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| 203 | end
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| 204 |
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[439] | 205 | # those two methods requires Regexp that is optional in mruby
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[270] | 206 | ##
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| 207 | # ISO 15.2.10.5.3
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[439] | 208 | #def =~(re)
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| 209 | # re =~ self
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| 210 | #end
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[270] | 211 |
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| 212 | ##
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| 213 | # ISO 15.2.10.5.27
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[439] | 214 | #def match(re, &block)
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| 215 | # re.match(self, &block)
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| 216 | #end
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[270] | 217 | end
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