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(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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16 | offset = 0
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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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22 | end
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23 | block.call(this[offset, this.size - offset]) if this.size > offset
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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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42 | when "1", "2", "3", "4", "5", "6", "7", "8", "9"
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43 | ""
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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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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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81 | end
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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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86 | end
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87 | result << self[offset..-1] if offset < length
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88 | result.join
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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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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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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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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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147 | else
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148 | replace.__sub_replace(this[0, found], pattern, this[offset..-1] || "")
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149 | end
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150 | result << this[offset..-1] if offset < length
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151 | result.join
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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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162 | raise RuntimeError, "can't modify frozen String" if frozen?
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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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199 | case pos
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200 | when String
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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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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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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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226 | return value
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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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