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feat(lang): 0.R5 - a reducer writes one state and may read others, declared between its state and the action

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What only becomes known inside the drain - a value another reducer just set, the map in play - no longer
has to be faked into the action, so a verb that reads several systems while it changes one is a reducer
instead of an act handed its states. A second state to write is still refused, and the message says the
way out. examples/actions/reads.ludic; reseeded.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Orkun ÇAKILKAYA 2026-09-26 18:23:48 +03:00
parent dfcc851d2a
commit c64f8750e2
8 changed files with 48037 additions and 47917 deletions
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tools/ludic-cli/test.ludic
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@ -1013,6 +1013,7 @@ function cmd_dev_test() -> int {
reject_case("rejected/layer_cycle", "go round in a circle: items -> layer app -> items", "a cycle through a layer and out of it is refused")
feat_case("actions/pack", "", "0 1 9 13 picked 7 picked 9 too heavy", "pack.ludic (0.R: actions, reducers - one per state, in the order of the states' names - dispatch, drain_actions, an action a reducer dispatches goes behind)")
controller_case("actions/ui_press", "", "5 10", "ui_press.ludic (0.R4: an action a UI press dispatches is reduced before ludic.ui hands control back)")
feat_case("actions/reads", "", "5 5 1", "reads.ludic (0.R5: a reducer reads other states, declared between its own and the action)")
feat_case("actions/modules", "", "2", "modules.ludic (0.R: an action in one module, its reducer in another)")
actions_deps_case()
deps_reach_case()
@ -1020,7 +1021,7 @@ function cmd_dev_test() -> int {
feat_case("actions/phases", "dd a q", "1 0 2 0 2 1 1 1 1 2 1 2", "phases.ludic (0.R: the frame loop drains the queue after every phase - Input's actions are reduced before Update)")
feat_case("actions/runaway", "", "actions: Ping is still being dispatched after 64 rounds of reducers - a reducer dispatches what dispatches it", "runaway.ludic (0.R: a reducer that dispatches what dispatches it is stopped by name)")
reject_case("rejected/registry_count_key", "def Tools count: its constant would be TL_COUNT", "a registry key named count is refused")
reject_case("rejected/reducer_two_states", "a reducer takes one state, and w is a Wallet", "a reducer takes exactly one state")
reject_case("rejected/reducer_two_states", "a reducer writes one state, and w is a mut Wallet", "a reducer writes exactly one state")
reject_case("rejected/reducer_not_action", "Buy is not an action", "a reducer is on an action")
reject_case("rejected/dispatch_unknown", "dispatch Sell: Sell is not an action", "only an action is dispatched")
feat_case("state/counter", "", "11 3 heard 5", "counter.ludic (0.S: a state, mut and read-only parameters, entry, listener and fn-value injection)")