From: Run Paint Run Run <redmine@...>
Date: 2009-06-24T06:42:29+09:00
Subject: [ruby-core:23997] [Bug #1681] Integer#chr Should Infer Encoding of Given Codepoint

Bug #1681: Integer#chr Should Infer Encoding of Given Codepoint
http://redmine.ruby-lang.org/issues/show/1681

Author: Run Paint Run Run
Status: Open, Priority: Low
Category: M17N
ruby -v: ruby 1.9.2dev (2009-06-21 trunk 23774) [i686-linux]

String#ord and Integer#chr are symmetrical operations on ASCII Strings:

    'a'.ord.chr   #=> "a"

But Integer#chr fails to round-trip when the given codepoint is outside the range of ASCII:

    "\u{2563}".ord.chr #=> RangeError: 9571 out of char range

To fix this, the codepoint's encoding needs to be specified:

    "\u{2563}".ord.chr('utf-8')  #=> "���"

This seems needlessly verbose given that Ruby already knows that my source encoding is UTF-8. I suggest, then, that, when invoked with no argument, Integer#chr displays the given codepoint w.r.t to the current encoding, raising a RangeError only if the codepoint is out-of-bounds for this inferred encoding.


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