Use Nemeth Indicators to Delimit Math Content in Text

首先追蹤 MathCAT 繪製 Nemeth 時 NVDA Add-On 如何處理行內數學，然後將目前的間距與此 issue 中提出的指示符序列進行比較。完成應意味著混合文字和數學使用指定的 Nemeth 分隔符，並且行為以及任何可選的 Toggle 都已得到明確解決。

MathCAT Version

MathCAT-0.6.6 (NVDA Add-On)

Current Behavior

When MathCAT encounters in-line math content and is set to render math as Nemeth, it inserts one space before the math and two spaces afterward to distinguish it from the surrounding text.

Proposed Change

Nemeth indicators would likely serve as better delimiters. Benefits include

• a more natural rendering of mixed content (text interspersed with math), since that is how such content would be brailled physically.
• more conspicuous indication of code switching (especially useful in STEM documents).
• easier identification of symbols (e.g., punctuation) directly following math content, as the Nemeth indicators occupy the full height of the cells they use.
• the ability (at least in theory) to use NVDA's braille output as (nearly) embosser-ready Unicode braille (since the standard is to use Nemeth indicators in UEB documents with Nemeth math content).

Perhaps an option could be given to toggle this behavior if desired.

Comparison

Mixed-Content Statement

In this case, $y$ is proportional to $x^2$.

Current Nemeth Output (Unicode)

⠠⠔⠀⠹⠀⠉⠁⠎⠑⠂⠀⠀⠰⠽⠀⠀⠀⠊⠎⠀⠏⠗⠕⠏⠕⠗⠰⠝⠁⠇⠀⠞⠕⠀⠀⠭⠘⠆⠀⠀⠲

Proposed Nemeth Output (Unicode)

⠠⠔⠀⠹⠀⠉⠁⠎⠑⠂⠀⠸⠩⠀⠽⠀⠸⠱⠀⠊⠎⠀⠏⠗⠕⠏⠕⠗⠰⠝⠁⠇⠀⠞⠕⠀⠸⠩⠀⠭⠘⠆⠀⠸⠱⠲

If Nemeth indicators were adopted, then the grade 1 symbol indicator would not be necessary before the $y$.