A formula is written as plain text and translated to MathML. Text left
bare inside a row is not drawn by the browser, so a token without an
element disappears: every multi-digit number did. `a = floor((14 - month)
/ 12)` came out as `a = floor ( ( - month ) )`, and `year + 4800` as
`year + `. The markup looked reasonable at a glance, and the numbers were
simply gone.
The classification now covers every kind of text and has no bare output.
A number of any length is `mn`; one letter of any script is an identifier,
so Greek stays a variable rather than becoming upright text; an operator,
including one written with its spacing, is `mo`; a space is an explicit
`mspace`; and anything else is `mtext` rather than nothing.
A test walks every document in both languages and compares the characters
the page would show against the characters the formula was written with.
It found three more formulas dropping a sign, and it now guards the whole
set: ninety-six formula blocks, checked on every run rather than by
looking at a page. Only letters and digits are compared, because the
other characters in a formula source are notation — `^`, `_`, `*`,
`/`, braces, and the word `sqrt`, which is drawn as a radical sign.
The service is a library with a thin binary over it, which is what makes
the move possible: an integration test is a separate crate and reaches
only what the library makes public, so the modules now live in
`src/lib.rs` and `main.rs` is the entry point. `src/` holds no test
code, which is the shape `apsis-rs` already has.
Eleven items are internal to a module and a test reaches them anyway.
Those stay `pub(crate)` where they are defined and are offered through
`src/testkit.rs`, which is the one place a caller is expected to look for
them. A wrapper is also the only way to offer a private thing outward:
Rust does not let visibility be widened twice, so a `pub(crate)` item
cannot be re-exported as `pub`. That keeps the seams in one file instead
of scattering them through the modules under test.
The 146 module tests and the 23 end to end tests all still run, which is
the number this move had to preserve: the 146 are spread over eighteen
files in `tests/`, one per module that had them.
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