fed-sx-m1: Step 7a — pure-functional projection driver + 12 tests

next/tests/projection_pure.sh

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+#!/usr/bin/env bash
+# next/tests/projection_pure.sh — Step 7a acceptance test.
+#
+# Exercises the pure-functional projection driver:
+#   new/2,3, fold_activity/2, replay/2, name/1, state/1, fold_fn/1.
+# Fold bodies are Erlang funs in v1; SX-source eval bridge will
+# plug into the same record later. 12 cases.
+
+set -uo pipefail
+cd "$(git rev-parse --show-toplevel)"
+
+SX_SERVER="${SX_SERVER:-hosts/ocaml/_build/default/bin/sx_server.exe}"
+if [ ! -x "$SX_SERVER" ]; then
+  SX_SERVER="/root/rose-ash/hosts/ocaml/_build/default/bin/sx_server.exe"
+fi
+if [ ! -x "$SX_SERVER" ]; then
+  echo "ERROR: sx_server.exe not found." >&2
+  exit 1
+fi
+
+VERBOSE="${1:-}"
+PASS=0; FAIL=0; ERRORS=""
+TMPFILE=$(mktemp); trap "rm -f $TMPFILE" EXIT
+
+cat > "$TMPFILE" <<'EPOCHS'
+(epoch 1)
+(load "lib/erlang/tokenizer.sx")
+(load "lib/erlang/parser.sx")
+(load "lib/erlang/parser-core.sx")
+(load "lib/erlang/parser-expr.sx")
+(load "lib/erlang/parser-module.sx")
+(load "lib/erlang/transpile.sx")
+(load "lib/erlang/runtime.sx")
+(load "lib/erlang/vm/dispatcher.sx")
+
+(epoch 2)
+(eval "(get (erlang-load-module (file-read \"next/kernel/projection.erl\")) :name)")
+
+;; new/2 sets initial state to the supplied value
+(epoch 10)
+(eval "(get (erlang-eval-ast \"P = projection:new(activity_log, init_state), projection:state(P) =:= init_state\") :name)")
+
+;; new/2 default fold is identity
+(epoch 11)
+(eval "(get (erlang-eval-ast \"P = projection:new(activity_log, base), P1 = projection:fold_activity(P, anything), projection:state(P1) =:= base\") :name)")
+
+;; new/3 stores supplied fold
+(epoch 12)
+(eval "(get (erlang-eval-ast \"P = projection:new(counter, 0, fun (_A, S) -> S + 1 end), is_function(projection:fold_fn(P))\") :name)")
+
+;; fold_activity threads through the fold fn
+(epoch 13)
+(eval "(erlang-eval-ast \"P = projection:new(counter, 0, fun (_A, S) -> S + 1 end), P1 = projection:fold_activity(P, x), projection:state(P1)\")")
+
+;; Two fold_activity calls accumulate
+(epoch 14)
+(eval "(erlang-eval-ast \"P = projection:new(counter, 0, fun (_A, S) -> S + 1 end), P1 = projection:fold_activity(P, a), P2 = projection:fold_activity(P1, b), projection:state(P2)\")")
+
+;; replay over a list
+(epoch 15)
+(eval "(erlang-eval-ast \"P = projection:new(counter, 0, fun (_A, S) -> S + 1 end), P1 = projection:replay(P, [a, b, c, d, e]), projection:state(P1)\")")
+
+;; replay over [] returns the projection unchanged (state preserved)
+(epoch 16)
+(eval "(erlang-eval-ast \"P = projection:new(counter, 99, fun (_A, S) -> S + 1 end), P1 = projection:replay(P, []), projection:state(P1)\")")
+
+;; Fold can read activity content (here append it)
+(epoch 17)
+(eval "(get (erlang-eval-ast \"P = projection:new(byname, [], fun (A, S) -> [A | S] end), P1 = projection:replay(P, [a, b, c]), projection:state(P1) =:= [c, b, a]\") :name)")
+
+;; Different projections are independent (different fold bodies)
+(epoch 18)
+(eval "(get (erlang-eval-ast \"P1 = projection:new(p_count, 0, fun (_A, S) -> S + 1 end), P2 = projection:new(p_collect, [], fun (A, S) -> [A | S] end), R1 = projection:replay(P1, [a, b, c]), R2 = projection:replay(P2, [a, b, c]), {projection:state(R1), projection:state(R2)} =:= {3, [c, b, a]}\") :name)")
+
+;; Name accessor
+(epoch 19)
+(eval "(get (erlang-eval-ast \"projection:name(projection:new(some_name, init)) =:= some_name\") :name)")
+
+;; Multi-step replay: aggregator by activity tag
+(epoch 20)
+(eval "(get (erlang-eval-ast \"By = fun (A, S) -> case A of {tag, T} -> [T | S]; _ -> S end end, P = projection:new(tag_log, [], By), P1 = projection:replay(P, [{tag, foo}, plain, {tag, bar}, {tag, baz}]), projection:state(P1) =:= [baz, bar, foo]\") :name)")
+EPOCHS
+
+OUTPUT=$(timeout 120 "$SX_SERVER" < "$TMPFILE" 2>/dev/null)
+
+check() {
+  local epoch="$1" desc="$2" expected="$3"
+  local actual
+  actual=$(echo "$OUTPUT" | awk -v e="$epoch" '
+    $0 ~ "^\\(ok-len " e " " { getline; print; exit }
+    $0 ~ "^\\(ok " e " "     { print; exit }
+    $0 ~ "^\\(error " e " "  { print; exit }
+  ')
+  [ -z "$actual" ] && actual="<no output for epoch $epoch>"
+  if echo "$actual" | grep -qF -- "$expected"; then
+    PASS=$((PASS+1))
+    [ "$VERBOSE" = "-v" ] && echo "  ok $desc"
+  else
+    FAIL=$((FAIL+1))
+    ERRORS+="  FAIL [$desc] (epoch $epoch) expected: $expected | actual: $actual
+"
+  fi
+}
+
+check  2  "module load name"                  "projection"
+check 10  "new/2 stores initial state"        "true"
+check 11  "default fold is identity"          "true"
+check 12  "new/3 stores fold fn"              "true"
+check 13  "fold_activity threads fn"          "1"
+check 14  "two folds accumulate"              "2"
+check 15  "replay over 5 activities"          "5"
+check 16  "replay over [] preserves state"    "99"
+check 17  "fold can read activity content"    "true"
+check 18  "different projections indep."      "true"
+check 19  "name accessor"                     "true"
+check 20  "tag-aware fold (replay)"           "true"
+
+TOTAL=$((PASS+FAIL))
+if [ $FAIL -eq 0 ]; then
+  echo "ok $PASS/$TOTAL next/tests/projection_pure.sh passed"
+else
+  echo "FAIL $PASS/$TOTAL passed, $FAIL failed:"
+  echo "$ERRORS"
+fi
+[ $FAIL -eq 0 ]