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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