fix: No longer logs warnings for missing params.* keys. (except spellcheck).

AGENTS.md

@@ -442,8 +442,9 @@ Rust-style error messages with multi-line source context, caret underlines, and
 
 **Exceptions** (no warning):
 - `{{.}}` and dot-prefixed names (current context)
-- Paths that cross a map (e.g., `params.*` — user-defined namespace)
+- Paths that cross a map (e.g., `params.*`) — validated for typos via Levenshtein: close matches warn with a suggestion, genuinely absent keys are suppressed silently
 - `Maybe(bool)` fields with nil value (field exists, value is nil — distinguished via `struct_has_field`)
+- Found fields whose value is nil/empty (e.g., nil `json.Value` union) — the field exists, looking up sub-keys is valid "not found" behavior
 
 **Block override source tracking**: `Block_Override.source: Template` ensures warnings inside block overrides point at the override's source file (e.g., `page.html`), not the parent template (`base.html`).
 

mustache/data.odin

@@ -137,6 +137,22 @@ resolve_name :: proc(name: string, ctx: []any) -> any {
 	return result
 }
 
+collect_map_keys :: proc(container: any, allocator := context.temp_allocator) -> []string {
+	val, info := base_value(container)
+	if info == nil do return nil
+	if _, ok := info.variant.(runtime.Type_Info_Map); !ok {
+		return nil
+	}
+	out := make([dynamic]string, 0, 4, allocator)
+	it := 0
+	for {
+		key, _ := reflect.iterate_map(val, &it) or_break
+		key_str := key.(string) or_continue
+		append(&out, key_str)
+	}
+	return out[:]
+}
+
 // is_truthy checks mustache truthiness.
 is_truthy :: proc(a: any) -> bool {
 	if a == nil {
@@ -302,3 +318,4 @@ write_value :: proc(b: ^strings.Builder, a: any, escape: bool) {
 		strings.write_string(b, s[start:])
 	}
 }
+

mustache/suggest.odin

@@ -121,9 +121,18 @@ validate_key_path :: proc(
 	for i in 1 ..< part_count {
 		v, info := base_value(current)
 		if info == nil {
-			return false, parts[i], nil
+			return true, "", nil
 		}
 		if _, is_map := info.variant.(runtime.Type_Info_Map); is_map {
+			val, found := lookup_in(current, parts[i])
+			if found {
+				current = val
+				continue
+			}
+			available := collect_map_keys(current, allocator)
+			if suggest_correction(available, parts[i]) != "" {
+				return false, parts[i], available
+			}
 			return true, "", nil
 		}
 		if _, is_struct := info.variant.(runtime.Type_Info_Struct); is_struct {

mustache/suggest_test.odin

@@ -2,6 +2,7 @@
 #+feature dynamic-literals
 package mustache
 
+import "core:encoding/json"
 import "core:fmt"
 import "core:testing"
 
@@ -196,3 +197,68 @@ test_warn_no_false_positive_for_valid_keys :: proc(t: ^testing.T) {
 	ok, missing, _ := validate_key_path(ctx[:], "name")
 	testing.expect_value(t, ok, true)
 }
+
+// --- json.Value map crossing tests ---
+
+JSON_Params_Context :: struct {
+	params: json.Value,
+}
+
+@(test)
+test_validate_key_path_crosses_json_value_map :: proc(t: ^testing.T) {
+	params_map := make(json.Object, context.temp_allocator)
+	params_map["author"] = json.String("Tester")
+
+	data := JSON_Params_Context { params = params_map }
+	ctx := make([dynamic]any, 0, 1, context.temp_allocator)
+	append(&ctx, data)
+
+	ok, missing, _ := validate_key_path(ctx[:], "params.starred")
+	testing.expect(t, ok, "path crossing json.Value map should be ok")
+	testing.expect(t, missing == "", "no missing segment for map crossing")
+}
+
+@(test)
+test_validate_key_path_json_value_map_existing_key :: proc(t: ^testing.T) {
+	params_map := make(json.Object, context.temp_allocator)
+	params_map["author"] = json.String("Tester")
+
+	data := JSON_Params_Context { params = params_map }
+	ctx := make([dynamic]any, 0, 1, context.temp_allocator)
+	append(&ctx, data)
+
+	ok, missing, _ := validate_key_path(ctx[:], "params.author")
+	testing.expect(t, ok, "existing key in json.Value map should be ok")
+}
+
+@(test)
+test_validate_key_path_map_typo :: proc(t: ^testing.T) {
+	params_map := make(json.Object, context.temp_allocator)
+	params_map["author"] = json.String("Tester")
+	params_map["social"] = json.String("")
+
+	data := JSON_Params_Context { params = params_map }
+	ctx := make([dynamic]any, 0, 1, context.temp_allocator)
+	append(&ctx, data)
+
+	ok, missing, available := validate_key_path(ctx[:], "params.authr")
+	testing.expect(t, !ok, "typo of map key should not be ok")
+	testing.expect_value(t, missing, "authr")
+	suggestion := suggest_correction(available, "authr")
+	testing.expect_value(t, suggestion, "author")
+}
+
+@(test)
+test_validate_key_path_map_no_close_match :: proc(t: ^testing.T) {
+	params_map := make(json.Object, context.temp_allocator)
+	params_map["author"] = json.String("Tester")
+	params_map["social"] = json.String("")
+
+	data := JSON_Params_Context { params = params_map }
+	ctx := make([dynamic]any, 0, 1, context.temp_allocator)
+	append(&ctx, data)
+
+	ok, missing, _ := validate_key_path(ctx[:], "params.xyz")
+	testing.expect(t, ok, "unknown key with no close match should be ok (suppressed)")
+	testing.expect(t, missing == "", "no missing segment when suppressed")
+}