feat(LogQL): add static method 'type' (#271)

src/logql/src/index.ts

@@ -7,6 +7,14 @@ import { ParserExpression } from "./parserExpression";
 export { StreamSelector, LineFilters, LabelFilters, ParserExpression };
 
 export class LogQL {
+  static type(QL: string | LogQL) {
+    if (typeof QL === "string") {
+      return /^[a-zA-Z_\s]+\(/g.test(QL) ? "metric" : "query";
+    }
+
+    return QL.type;
+  }
+
   #type: "metric" | "query" = "query";
   #rawInit: string;
 
@@ -19,7 +27,7 @@ export class LogQL {
     init?: string | string[] | StreamSelector | LineFilters | LabelFilters | ParserExpression
   ) {
     if (typeof init === "string") {
-      this.#type = /^[a-zA-Z_\s]+\(/g.test(init) ? "metric" : "query";
+      this.#type = LogQL.type(init);
 
       if (this.#type === "metric") {
         this.#rawInit = init;

src/logql/test/logql.spec.ts

@@ -8,6 +8,22 @@ import { StreamSelector } from "../src/streamSelector";
 import { LineFilters } from "../src/lineFilters";
 
 describe("LogQL", () => {
+  describe("static type", () => {
+    it("should return 'metric' given a metric query", () => {
+      assert.strictEqual(
+        LogQL.type("count_over_time({ label = `value` } [5m])"),
+        "metric"
+      );
+    });
+
+    it("should return 'query' given a normal query with no aggregations etc", () => {
+      assert.strictEqual(
+        LogQL.type("{ label = `value` }"),
+        "query"
+      );
+    });
+  });
+
   describe("constructor", () => {
     it("should create a new instance of LogQL", () => {
       const logql = new LogQL();