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Hold a reference path like a sibling path; add the lowercase, uppercase and ascii transforms

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Lilleman auf Larv
2026-09-02 12:52:19 +02:00
parent 8fa33694b9
commit 31c2f12098
8 changed files with 372 additions and 174 deletions
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README.md
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@@ -273,10 +273,11 @@ reproducible. A time-based id (UUID v7, ULID) therefore draws its timestamp from
the rng, not the clock — the result is a valid, reproducible value, not a real
point in time.
There are four kinds. **Derivations** read the digits emitted so far, so put them
There are five kinds. **Derivations** read the digits emitted so far, so put them
after their payload; **samples** read only the rng, so they stand alone; one
**session counter** (`seq`) advances state held on the generator; and one
**computation** (`calc`) evaluates arithmetic over sibling fields. Arguments are
**session counter** (`seq`) advances state held on the generator; one
**computation** (`calc`) evaluates arithmetic over sibling fields; and the
**transforms** rewrite one field's value. Arguments are
validated at `New` (a bad count, range, country, or expression fails fast); a
length, count or decimal place beyond a sane maximum is rejected there too, so a
fat-fingered `hex(2000000000)` can't try to allocate gigabytes at render.
@@ -299,6 +300,7 @@ fat-fingered `hex(2000000000)` can't try to allocate gigabytes at render.
| `{iban(CC)}` | sample | a length- and mod-97-valid IBAN for country `CC` (BE, DE, DK, ES, FI, NO, SE) |
| `{seq()}`, `{seq(name)}` | session counter | next integer (from 1) in this generator's sequence; `name` selects an independent counter |
| `{calc(expr)}`, `{calc(expr,dp)}` | computation | value of an arithmetic expression over number literals and sibling fields; `dp` rounds |
| `{lowercase(x)}`, `{uppercase(x)}`, `{ascii(x)}` | transform | the field `x` — a name, a path or a `..path` — lower-cased, upper-cased, or folded to ASCII (`Åsa` → `Asa`); they nest: `{lowercase(ascii(x))}` |
`{ean()}` is also the ISBN-13 check (an ISBN-13 *is* an EAN-13 — build the 978/979
prefix in data and call `{ean()}`). `{iban()}` is a sample, not a derivation:
@@ -339,9 +341,11 @@ data dirs:
{ "format": "Hej, {..en_US.person}!" }
```
renders e.g. `Hej, Pat Smith!`. References are bound when you create the generator, so
a path that is unknown, names a folder, or steps through a choice
fails at `New`. A reference that leads back to its own value (directly, mutually,
renders e.g. `Hej, Pat Smith!`. A reference path is held like a sibling path:
`{..person.first} {..person.last}` read one person, and `{lowercase(..person.first)}`
reads that same draw, while a bare `{..die} {..die}` is two draws. References are
bound when you create the generator, so a path that is unknown, names a folder,
or reads a field not every variant of a choice carries fails at `New`. A reference that leads back to its own value (directly, mutually,
or through a chain) is a cycle that would never finish rendering, so it too is
rejected at `New`.