fix(validator): enforce lowercase package name per spec PR WasmEdge#630

The spec updated interfacename grammar from <label> to <words>,
confirming that package names must be lowercase-only kebab-case.

Refs: WebAssembly/component-model#630

Assisted-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: LFsWang <tnst92002@gmail.com>

Author: LFsWang

lib/validator/component_name.cpp

@@ -581,13 +581,9 @@ Expect<ComponentName> ComponentName::parse(std::string_view Name) {
       return reportError("nested namespaces not supported yet"sv);
     }
 
-    // NOTE: The spec (Explainer.md:2550) uses <label> here, which allows
-    // mixed-case kebab. The wasm-tools reference implementation enforces
-    // lowercase, and the spec test naming.14.wasm expects rejection of
-    // uppercase packages. We follow the spec grammar; if the spec updates
-    // to <words>, this should be changed to isLowercaseKebabString.
-    if (!tryReadKebab(Next, Package)) {
-      return reportError("invalid package label in interface name"sv);
+    // interfacename ::= <namespace> <words> <projection> ...
+    if (!tryReadKebab(Next, Package) || !isLowercaseKebabString(Package)) {
+      return reportError("invalid package in interface name"sv);
     }
 
     Counter = 0;

test/component/ComponentRegressionTest.cpp

@@ -1081,12 +1081,8 @@ TEST(ComponentNameParser, Semver) {
   // Invalid versions.
   EXPECT_FALSE(ComponentName::parse("ns:pkg/iface@01.2.3"sv));
   EXPECT_FALSE(ComponentName::parse("ns:pkg/iface@abc"sv));
-  // Package is <label> per spec — allows mixed-case kebab.
-  // NOTE: wasm-tools enforces lowercase here; we follow the spec grammar.
-  // If the spec updates <label> to <words>, change these expectations.
-  EXPECT_TRUE(ComponentName::parse("a:B/c"sv));
-  EXPECT_TRUE(ComponentName::parse("ns:PKG/iface"sv));
-  // "Pkg" is NOT valid kebab (mixed case within fragment).
+  EXPECT_FALSE(ComponentName::parse("a:B/c"sv));
+  EXPECT_FALSE(ComponentName::parse("ns:PKG/iface"sv));
   EXPECT_FALSE(ComponentName::parse("ns:Pkg/iface"sv));
   EXPECT_FALSE(ComponentName::parse("ns:pkg/iface@"sv));
   EXPECT_TRUE(ComponentName::parse("ns:pkg/iface@0.0.0"sv));