On Mon, Apr 21, 2014 at 2:58 AM, Asmus Freytag <[email protected]> wrote:
> On 4/20/2014 3:24 AM, Eli Zaretskii wrote: > > Would someone please help understand the following subtleties and > obscure language in the UBA document found > athttp://www.unicode.org/reports/tr9/? Thanks in advance. > > 3. Paragraph 3.3.2 says, under "Non-formatting characters": > > X6. For all types besides B, BN, RLE, LRE, RLO, LRO, PDF, RLI, LRI, > FSI, and PDI: > > . Set the current character’s embedding level to the embedding > level of the last entry on the directional status stack. > > [...] > > Note that the current embedding level is not changed by this rule. > > What does this last sentence mean by "the current embedding level"? > The first bullet of X6 mandates that "the current character’s > embedding level" _is_ changed by this rule, so what other "current > embedding level" is alluded to here? > > I'm punting on that one - can someone else answer this? > I assume "current embedding level" here meant "the embedding level of the last entry on the directional status stack". (This is a natural slip to make if you think in terms of an optimized implementation that stores each component of the top of the directional status stack in a variable, as suggested in 3.3.2.) James
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