Implement basic integer math operations

src/vm/commands/abs.ts

@@ -0,0 +1,24 @@
+import {Command} from "./command.js";
+import {LexInput} from "../lexer.js";
+import {StrVM} from "../vm.js";
+import {Awaitable} from "../../util/types.js";
+
+export class Abs extends Command<{}> {
+    attemptParse(): Awaitable<{}> {
+        return {}
+    }
+
+    getDisplayName(): string {
+        return 'abs'
+    }
+
+    isParseCandidate(token: LexInput): boolean {
+        return this.isKeyword(token, 'abs')
+    }
+
+    async execute(vm: StrVM): Promise<StrVM> {
+        return vm.replaceContextMatchingTerm({
+            int: sub => Math.abs(sub),
+        })
+    }
+}