Bug #12204: Invalid range of capital letters at Greek alphabet

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]
• Backport: 2.1: DONE, 2.2: DONE, 2.3: DONE

[tzabaman (George Vrettos)]

Greek alphabet's first and last letter is:

• α - ω (lower case)
• Α - Ω (upper case)

So if we write on a ruby console the following script, we get:

('α'..'ω').to_a

=> ["α", "β", "γ", "δ", "ε", "ζ", "η", "θ", "ι", "κ", "λ", "μ", "ν", "ξ", "ο", "π", "ρ", "ς", "σ", "τ", "υ", "φ", "χ", "ψ", "ω"] 

which is correct, we get all 24 lower case characters of the greek alphabet, and a "special one", the letter "ς" which HAS NO EQUIVALENT uppercase letter. TOTAL: 25 characters

Now if we try to run the above script with upper case characters...

('Α'..'Ω').to_a

=> ["Α", "Β", "Γ", "Δ", "Ε", "Ζ", "Η", "Θ", "Ι", "Κ", "Λ", "Μ", "Ν", "Ξ", "Ο", "Π", "Ρ"]

we only get 17 characters. The rest 7 upper case characters are missing! Those are (["Σ", "Τ", "Υ", "Φ", "Χ", "Ψ", "Ω"])

Now if we try to "construct" the greek alphabet by using the UTF-8 equivalent number of its chatacter, we get the following:

(913..937).map { |char| char.chr('UTF-8') }

=> ["Α", "Β", "Γ", "Δ", "Ε", "Ζ", "Η", "Θ", "Ι", "Κ", "Λ", "Μ", "Ν", "Ξ", "Ο", "Π", "Ρ", "\u03A2", "Σ", "Τ", "Υ", "Φ", "Χ", "Ψ", "Ω"]

Note the invalid character "\u03A2" between letters "Ρ" and "Σ".

I believe that the problem is the letter "ς" (greek sigma) which has no upper case equivalent. Ruby throws an exception at this point and never returns the rest of the characters.

[[http://www.fileformat.info/info/unicode/char/03a2/index.htm]]

[tzabaman (George Vrettos)]

• ruby -v changed from 2.3.0 to ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset r54210.

---

string.c: skip invalid char gap

• string.c (enc_succ_alnum_char): try to skip an invalid character
  gap between GREEK CAPITAL RHO and SIGMA.
  [ruby-core:74478] [Bug #12204]

[usa (Usaku NAKAMURA)]

• Backport changed from 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN to 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED

[usa (Usaku NAKAMURA)]

• Backport changed from 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED to 2.1: DONE, 2.2: REQUIRED, 2.3: REQUIRED

ruby_2_1 r54284 merged revision(s) 54210.

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.1: DONE, 2.2: REQUIRED, 2.3: REQUIRED to 2.1: DONE, 2.2: DONE, 2.3: REQUIRED

Backported into ruby_2_2 branch at r54336.

[naruse (Yui NARUSE)]

• Backport changed from 2.1: DONE, 2.2: DONE, 2.3: REQUIRED to 2.1: DONE, 2.2: DONE, 2.3: DONE

ruby_2_3 r54384 merged revision(s) 54210.