RBNF rule semantics for a ruleset when there is no negative number rule

[Philippe Verdy]

rule for "4" matches the "Binary-search the rule list for the rule with the
highest base value less than or equal to the number.", in fact all rules
for "0", "3" and "4" have a base value less than or equal to the number 50.
The binary search will point you just above rule for "4", which is the
highest base value to use.

2016-12-02 10:52 GMT+01:00 Kip Cole <kipcole9 at gmail.com>:

> I am writing some software using the CLDR.  I am stuck on working out the
> right semantics for formatting a number using RBNF and there is no matching
> rule within a specified ruleset.
>
> For example (I’m writing this in Elixir but I think the intent is clear)
> formatting the negative integer -50 in the locale “hr”:
>
>          iex> Cldr.Rbnf.Spellout.spellout_ordinal_neuter(-50, "hr”)
>
> returns an error because in the locale “hr”, the ruleset for
> spellout-ordinal-neuter has the following rules (in 30.0.2, using the json
> github content):
>
>         "%spellout-ordinal-neuter": {
>           "0": "=%%spellout-ordinal-base=o;",
>           "3": "=%%spellout-ordinal-base=e;",
>           "4": "=%%spellout-ordinal-base=o;"
>         }
>
> So that by my understanding, a negative number can’t be formatted in this
> ruleset for this locale.  The nearest understanding I can get is from
> http://www.icu-project.org/apiref/icu4c/classRuleBasedNumberFormat.html
> which says:
>
>         • If the number is negative, use the negative-number rule.
>         • If the number has a fractional part and is greater than 1, use
> the improper fraction rule.
>         • If the number has a fractional part and is between 0 and 1, use
> the proper fraction rule.
>         • Binary-search the rule list for the rule with the highest base
> value less than or equal to the number. If that rule has two substitutions,
> its base value is not an even multiple of its divisor, and the number is an
> even multiple of the rule's divisor, use the rule that precedes it in the
> rule list. Otherwise, use the rule itself.
>
> Given a negative integer in this context then:
>
> 1. There is no negative number rule
> 2. There is no rule that satisfies "Binary-search the rule list for the
> rule with the highest base value less than or equal to the number.”
>
> Are then any additional semantics intended to cover this case or is an
> error the appropriate response?
>
> Many thanks.
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