diff options
Diffstat (limited to 'mrblib/string.rb')
| -rw-r--r-- | mrblib/string.rb | 52 |
1 files changed, 43 insertions, 9 deletions
diff --git a/mrblib/string.rb b/mrblib/string.rb index 05b13cb43..37441ec98 100644 --- a/mrblib/string.rb +++ b/mrblib/string.rb @@ -10,9 +10,8 @@ class String # # ISO 15.2.10.5.15 def each_line(&block) - # expect that str.index accepts an Integer for 1st argument as a byte data offset = 0 - while pos = self.index(0x0a, offset) + while pos = self.index("\n", offset) block.call(self[offset, pos + 1 - offset]) offset = pos + 1 end @@ -154,13 +153,48 @@ class String end ## - # Modify +self+ by replacing the content of +self+ - # at the position +pos+ with +value+. - def []=(pos, value) - pos += self.length if pos < 0 - b = self[0, pos] - a = self[pos + 1..-1] - self.replace([b, value, a].join('')) + # Modify +self+ by replacing the content of +self+. + # The portion of the string affected is determined using the same criteria as +String#[]+. + def []=(*args) + anum = args.size + if anum == 2 + pos, value = args + if pos.kind_of? String + posnum = self.index(pos) + if posnum + b = self[0, posnum.to_i] + a = self[(posnum + pos.length)..-1] + self.replace([b, value, a].join('')) + return value + else + raise IndexError, "string not matched" + end + else + pos += self.length if pos < 0 + if pos < 0 || pos > self.length + raise IndexError, "index #{args[0]} out of string" + end + b = self[0, pos.to_i] + a = self[pos + 1..-1] + self.replace([b, value, a].join('')) + return value + end + elsif anum == 3 + pos, len, value = args + pos += self.length if pos < 0 + if pos < 0 || pos > self.length + raise IndexError, "index #{args[0]} out of string" + end + if len < 0 + raise IndexError, "negative length #{len}" + end + b = self[0, pos.to_i] + a = self[pos + len..-1] + self.replace([b, value, a].join('')) + return value + else + raise ArgumentError, "wrong number of arguments (#{anum} for 2..3)" + end end ## |