macro(ast-json): add Loop/Break/Continue to AST JSON v0; add loop_normalize_macro (MVP identity) and loopform smoke; docs update

apps/macros/examples/loop_normalize_macro.nyash

@@ -0,0 +1,13 @@
+// loop_normalize_macro.nyash
+// MVP: identity expansion with (json, ctx) signature.
+// Next steps: normalize `loop(cond){ body }` into carrier-based LoopForm.
+
+static box MacroBoxSpec {
+  static function name() { return "LoopNormalize" }
+
+  static function expand(json, ctx) {
+    // For MVP, return input unchanged.
+    return json
+  }
+}
+

docs/reference/ir/ast-json-v0.md

@@ -7,10 +7,13 @@ Top-level
 - Nested nodes referenced inline; no IDs.
 - Span is omitted in v0 (unknown). Future versions may include `span` with file/line/col.
 
-Kinds (subset for Phase 2)
+Kinds (subset for Phase 2+)
 - Program: { kind: "Program", statements: [Node] }
+- Loop: { kind: "Loop", condition: Node, body: [Node] }
 - Print: { kind: "Print", expression: Node }
 - Return: { kind: "Return", value: Node|null }
+- Break: { kind: "Break" }
+- Continue: { kind: "Continue" }
 - Assignment: { kind: "Assignment", target: Node, value: Node }
 - If: { kind: "If", condition: Node, then: [Node], else: [Node]|null }
 - FunctionDeclaration: { kind: "FunctionDeclaration", name: string, params: [string], body: [Node], static: bool, override: bool }

src/macro/ast_json.rs

@@ -7,6 +7,11 @@ pub fn ast_to_json(ast: &ASTNode) -> Value {
             "kind": "Program",
             "statements": statements.into_iter().map(|s| ast_to_json(&s)).collect::<Vec<_>>()
         }),
+        ASTNode::Loop { condition, body, .. } => json!({
+            "kind": "Loop",
+            "condition": ast_to_json(&condition),
+            "body": body.into_iter().map(|s| ast_to_json(&s)).collect::<Vec<_>>()
+        }),
         ASTNode::Print { expression, .. } => json!({
             "kind": "Print",
             "expression": ast_to_json(&expression),
@@ -15,6 +20,8 @@ pub fn ast_to_json(ast: &ASTNode) -> Value {
             "kind": "Return",
             "value": value.as_ref().map(|v| ast_to_json(v)),
         }),
+        ASTNode::Break { .. } => json!({"kind":"Break"}),
+        ASTNode::Continue { .. } => json!({"kind":"Continue"}),
         ASTNode::Assignment { target, value, .. } => json!({
             "kind": "Assignment",
             "target": ast_to_json(&target),
@@ -77,8 +84,15 @@ pub fn json_to_ast(v: &Value) -> Option<ASTNode> {
             let stmts = v.get("statements")?.as_array()?.iter().filter_map(json_to_ast).collect::<Vec<_>>();
             ASTNode::Program { statements: stmts, span: Span::unknown() }
         }
+        "Loop" => ASTNode::Loop {
+            condition: Box::new(json_to_ast(v.get("condition")?)?),
+            body: v.get("body")?.as_array()?.iter().filter_map(json_to_ast).collect::<Vec<_>>(),
+            span: Span::unknown(),
+        },
         "Print" => ASTNode::Print { expression: Box::new(json_to_ast(v.get("expression")?)?), span: Span::unknown() },
         "Return" => ASTNode::Return { value: v.get("value").and_then(json_to_ast).map(Box::new), span: Span::unknown() },
+        "Break" => ASTNode::Break { span: Span::unknown() },
+        "Continue" => ASTNode::Continue { span: Span::unknown() },
         "Assignment" => ASTNode::Assignment { target: Box::new(json_to_ast(v.get("target")?)?), value: Box::new(json_to_ast(v.get("value")?)?), span: Span::unknown() },
         "If" => ASTNode::If { condition: Box::new(json_to_ast(v.get("condition")?)?), then_body: v.get("then")?.as_array()?.iter().filter_map(json_to_ast).collect::<Vec<_>>(), else_body: v.get("else").and_then(|a| a.as_array().map(|arr| arr.iter().filter_map(json_to_ast).collect::<Vec<_>>())), span: Span::unknown() },
         "FunctionDeclaration" => ASTNode::FunctionDeclaration {

tools/test/smoke/macro/loopform_identity_smoke.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+root=$(cd "$(dirname "$0")"/../../../.. && pwd)
+bin="$root/target/release/nyash"
+src="apps/tests/loop_min_while.nyash"
+
+if [ ! -x "$bin" ]; then
+  echo "nyash binary not found at $bin; build first (cargo build --release)" >&2
+  exit 1
+fi
+
+export NYASH_MACRO_ENABLE=1
+export NYASH_MACRO_PATHS="apps/macros/examples/loop_normalize_macro.nyash"
+
+# Prefer PyVM run to align with macro pipeline
+"$bin" --backend vm "$src" >/dev/null
+echo "[OK] loopform identity smoke passed"
+