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

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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>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-30 16:14:59 +03:00
parent d22abae476
commit ab0b84b87e
37 changed files with 125923 additions and 110956 deletions
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24
tools/ludic-cli/deps.ludic
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@ -262,13 +262,33 @@ function dp_pad(s: pointer, n: int) -> pointer {
}
# a function as its source names it: a reducer is `reducer Bag on PickUp`, not its symbol
function dp_fn_name(n: pointer) -> pointer {
if not s_starts(n, "ludic_reduce__") { return n }
if not s_starts(n, "ludic_reduce__") and not s_starts(n, "ludic_rowred__") { return n }
let rest = n[14 .. slen(n)]
for i in 0 .. slen(rest) - 1 {
if rest[i] == '_' and rest[i + 1] == '_' { return `reducer {rest[i + 2 .. slen(rest)]} on {rest[0 .. i]}` }
if rest[i] == '_' and rest[i + 1] == '_' { return `reducer {dp_row_name(rest[i + 2 .. slen(rest)])} on {rest[0 .. i]}` }
}
return n
}
# 27.3: a row reducer's symbol says `Deer__in__Herd__deer` for `Deer in Herd.deer`
function dp_row_name(s: pointer) -> pointer {
var out = ""
var seen = false
var i = 0
while i < slen(s) {
if not seen and i + 6 <= slen(s) and s[i .. i + 6] == "__in__" {
out = out + " in "
seen = true
i += 6
} else if seen and i + 2 <= slen(s) and s[i .. i + 2] == "__" {
out = out + "."
i += 2
} else {
out = out + s[i .. i + 1]
i += 1
}
}
return out
}
function dp_own(k: int) -> bool { return dp_pkg[k] == 0 }
# an edge the numbers count: between two of the program's own modules
function dp_counted(e: int) -> bool { return dp_own(dp_ef[e]) and dp_own(dp_et[e]) }