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feat(lang): 0.R1 - actions and reducers

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action Name { fields } is a typed record; reducer State on Action(s: mut State, a: Action) { ... }
in the module that owns the state takes exactly that state and the action (a second state is
refused); dispatch Action { fields } queues one from anywhere, the queue supplied by the runtime.
The queue is drained at the end of every phase of the frame loop, after every phase of ludic.base's
core_tick_all, and by drain_actions(): in dispatch order, each action's reducers in the order of
their states' names, an action a reducer dispatches queued behind, a queue still growing after 64
rounds stopped with the action named. Examples actions/pack, phases, runaway; rejects for a second
state, a reducer on a non-action and an unknown dispatch; ludic.base's actions_test; LANGUAGE.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-25 19:13:46 +03:00
parent 3a87d02696
commit 808c4a6f7a
19 changed files with 415 additions and 1 deletions
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selfhost/frontend/parse.ludic
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@ -468,6 +468,7 @@ function stmt_body() -> Node {
return n
}
if (t.text == "spawn") { return parse_spawn() }
if (t.text == "dispatch") and toks[pi + 1].kind == TK_ID { return parse_dispatch() } # 0.R
if (t.text == "machine") {
pi += 1; let n = node(S_MACHINE); n.a = expr(); skipnl(); eat_op("{")
var sidx = 0 # states auto-number by declaration order
@ -1026,6 +1027,8 @@ function parse_one_decl() -> void {
if is_id("view") and (toks[pi + 1].kind == TK_ID) and ((toks[pi + 2].text == "{") or (toks[pi + 2].text == "(")) { parse_view(); return } # L11
if is_id("component") and (toks[pi + 1].kind == TK_ID) and ((toks[pi + 2].text == "{") or (toks[pi + 2].text == "(")) { parse_ui_component(); return } # L11
if is_id("state") and (toks[pi + 1].kind == TK_ID) and (toks[pi + 2].text == "{") { parse_state(); return } # 0.S
if is_id("action") and (toks[pi + 1].kind == TK_ID) and (toks[pi + 2].text == "{") { parse_action(); return } # 0.R
if is_id("reducer") and (toks[pi + 1].kind == TK_ID) and (toks[pi + 2].text == "on") { parse_reducer(); return }
if is_id("var") {
if not g_allow_globals {
perr(`a module-level var is refused: a module's changing data is its state (state Name {{ ... }}), passed to the functions that use it - or, if it never changes, a let`)
@ -1572,5 +1575,6 @@ function parse_program() -> void {
views_finish() # L11: each view gets its model and call
components_finish() # L11: each component gets its class
ui_blocks_states() # 0.S: a ui block reads a state as State.field
actions_finish() # 0.R: the reducers checked, the queue written
g_gen_nodes = false
}