ludic/changes/row-reducers.md at eeb7a3d5fbd86dacd3c1ac4ba0a4eec99a5297eb

Orkuncakilkaya ab0b84b87e feat(lang): 27.3 - a reducer on a table's row: reducer T in S.table on A, @Target, Row<T>, @RowVerb, @Column

An action names one row of a ludic.base Table<T> by its handle, in a field marked @Target, and
`reducer Deer in Herd.deer on Spook(r: mut Row<Deer>, n: Noise, a: Spook)` runs once, for that row
alone (the table may sit down a path, S.w.tab). The drain resolves the handle (tb_row) and hands the
reducer a Row<T> - new in ludic.base: tb, row, h, rec - that the queue keeps, one per row reducer,
filled in place, so a targeted action allocates nothing; a stale handle runs nothing, and
LUDIC_ACTIONS_LOG=1 prints a line for it (@alloc_ok). Row reducers order among an action's by their
state's name, then the table's path.

Checked at compile time (actions_rows.ludic): the row reaches r.rec and r.h only - r.tb / r.row
refused, the view never assigned, stored, copied or handed on except to a @RowVerb (a function of
the record's own module taking Row<T> first; any other function taking a row is refused); a field
marked @Column (a table column mirrors it) is not written through r.rec; only the module owning the
state declares a row reducer; one @Target, an int, per action; the states between the row and the
action are read. `mut` is allowed on a Row<T> parameter.

ludic schema's code section gains row_reducers (record, table, state, action, target, predicted,
net, module, at) and row_verbs (name, record, module, at), and every action its target; row
reducers are left out of `reducers`. ludic deps and ludic-lsp name a row reducer
`reducer Deer in Herd.deer on Spook`. vocab: @Target, @Column, @RowVerb; docs/language pages;
LANGUAGE.md "A reducer on a row"; examples actions/rows and ten rejects; test.ludic feat, reject and
schema cases (not run); changes/row-reducers.md. Reseeded; bootstrap-cfree fixpoint holds (307497
lines); Maroon Lake's `ludic build --check` is clean against this tree.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-09-30 16:14:59 +03:00

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bump: minor type: feat A reducer on a table's row (phase 27.3). An action names one row of a ludic.base Table<T> by its handle, in a field marked @Target, and reducer Deer in Herd.deer on Spook(r: mut Row<Deer>, n: Noise, a: Spook) runs once, for that row alone (the table may sit down a path, WildState.w.tab).

The drain resolves the handle (tb_row) and hands the reducer a Row<T> (new in ludic.base: tb, row, h, rec) that it keeps, one per row reducer, filled in place: a targeted action allocates nothing. A stale handle runs nothing; LUDIC_ACTIONS_LOG=1 prints a line for it. Row reducers order among an action's reducers by their state's name, then the table's path.
The row goes no further, checked at compile time: a row reducer reaches r.rec and r.h, not r.tb or r.row; it does not assign, store, copy or hand on the row except to a @RowVerb (a function of the record's own module taking Row<T> first); a field marked @Column (a table column mirrors it) is written only by a verb; only the module owning the state declares a row reducer; states between the row and the action are read. mut is allowed on a Row<T> parameter.
ludic schema's code section gains row_reducers (record, table, state, action, target, predicted, net, module, at) and row_verbs (name, record, module, at), and every action its target; row reducers are not listed under reducers. ludic deps names a row reducer reducer Deer in Herd.deer on Spook; ludic-lsp's outline does too.
Examples actions/rows; rejects for a missing @Target, two of them, a @Column write, reaching the table, a row handed to a non-verb, a table that is not one, the parameter shape, a second state written, a verb with no row, and a reducer outside the state's module. @Predicted, @Net and @Broadcast on actions and row reducers are later steps of phase 27.

1.9 KiB Raw Blame History

1.9 KiB

Raw Blame History