feat(kernel): extension host — discovery, DAG resolve, apiVersion check, activate, HostAPI (wraps bus); 50 tests

1 files changed, 52 insertions, 0 deletions

diff --git a/packages/kernel/src/host/version.ts b/packages/kernel/src/host/version.ts
new file mode 100644
index 0000000..0d62a3b
--- /dev/null
+++ b/packages/kernel/src/host/version.ts
@@ -0,0 +1,52 @@
+interface SemVer {
+	readonly major: number;
+	readonly minor: number;
+	readonly patch: number;
+}
+
+function parseSemVer(version: string): SemVer {
+	const match = version.match(/^(\d+)\.(\d+)\.(\d+)$/);
+	if (!match) throw new Error(`Invalid semver: "${version}"`);
+	return {
+		major: Number(match[1]),
+		minor: Number(match[2]),
+		patch: Number(match[3]),
+	};
+}
+
+function gte(a: SemVer, b: SemVer): boolean {
+	if (a.major !== b.major) return a.major > b.major;
+	if (a.minor !== b.minor) return a.minor > b.minor;
+	return a.patch >= b.patch;
+}
+
+export function isApiVersionCompatible(range: string, kernelVersion: string): boolean {
+	if (range === "*") return true;
+
+	const kernel = parseSemVer(kernelVersion);
+
+	if (range.startsWith("^")) {
+		const min = parseSemVer(range.slice(1));
+		if (!gte(kernel, min)) return false;
+		if (min.major === 0) {
+			return kernel.major === 0 && kernel.minor === min.minor;
+		}
+		return kernel.major === min.major;
+	}
+
+	if (range.startsWith("~")) {
+		const min = parseSemVer(range.slice(1));
+		if (!gte(kernel, min)) return false;
+		return kernel.major === min.major && kernel.minor === min.minor;
+	}
+
+	if (range.startsWith(">=")) {
+		const min = parseSemVer(range.slice(2));
+		return gte(kernel, min);
+	}
+
+	const exact = parseSemVer(range);
+	return (
+		kernel.major === exact.major && kernel.minor === exact.minor && kernel.patch === exact.patch
+	);
+}