3 files changed, 87 insertions, 0 deletions
diff --git a/src/js-lang/builtin/builtin.ts b/src/js-lang/builtin/builtin.ts
new file mode 100644
index 0000000..dde91b6
--- /dev/null
+++ b/src/js-lang/builtin/builtin.ts
@@ -0,0 +1,39 @@
+type BUILTIN = (args: any[]) => any;
+
+export const V_BUILTIN_Arr: BUILTIN = (args) => args;
+
+// FIXME actually implement this properly
+export const V_BUILTIN_ToString: BUILTIN = (args) =>
+  args.length === 1 ? JSON.stringify(args[0]) : JSON.stringify(args);
+
+export const V_BUILTIN_Add: BUILTIN = (args) => {
+  if (args.every((arg) => ["string", "number"].includes(typeof arg))) {
+    return args.reduce(
+      (acc, cur) => acc + cur,
+      typeof args[0] === "string" ? "" : 0
+    );
+  }
+
+  throw new Error(`Cannot add operands ${JSON.stringify(args, undefined, 2)}`);
+};
+
+export const V_BUILTIN_Mul: BUILTIN = (args) => {
+  if (args.every((arg) => typeof arg === "number") && args.length === 2) {
+    return args.reduce((acc, cur) => acc * cur, 1);
+  }
+
+  throw new Error(
+    `Can only multiply [number, number], but got ${JSON.stringify(
+      args,
+      undefined,
+      2
+    )}`
+  );
+};
+
+export const nameToBUILTIN: Record<string, BUILTIN> = {
+  arr: V_BUILTIN_Arr,
+  tostring: V_BUILTIN_ToString,
+  add: V_BUILTIN_Add,
+  mul: V_BUILTIN_Mul,
+};
diff --git a/src/js-lang/builtin/index.ts b/src/js-lang/builtin/index.ts
new file mode 100644
index 0000000..00e77f7
--- /dev/null
+++ b/src/js-lang/builtin/index.ts
@@ -0,0 +1,2 @@
+export * from "./builtin";
+export * from "./sbuiltin";
diff --git a/src/js-lang/builtin/sbuiltin.ts b/src/js-lang/builtin/sbuiltin.ts
new file mode 100644
index 0000000..44c969d
--- /dev/null
+++ b/src/js-lang/builtin/sbuiltin.ts
@@ -0,0 +1,46 @@
+import { callFn, getEvaluatedChildren } from "../core/eval";
+import { ASTNode, FnPrim, StackFrame } from "../../ts-lang";
+
+type SBUILTIN = (node: ASTNode, frame: StackFrame) => any;
+
+export const V_SBUITLIN_Call: SBUILTIN = (node, frame) => {
+  const children = getEvaluatedChildren(node, frame);
+  const fn = children[0] as FnPrim | undefined;
+
+  if (!fn?.fn) {
+    throw new Error(
+      `Invalid params for function call: ${JSON.stringify(
+        children,
+        undefined,
+        2
+      )}`
+    );
+  }
+
+  return callFn(fn, children.slice(1), frame);
+};
+
+export const V_SBUILTIN_Map: SBUILTIN = (node, frame) => {
+  const children = getEvaluatedChildren(node, frame);
+  const fn = children[1] as FnPrim | undefined;
+
+  if (!fn?.fn) {
+    throw new Error(
+      `Invalid params for map: ${JSON.stringify(children, undefined, 2)}`
+    );
+  }
+
+  const values = children[0];
+
+  if (!Array.isArray(values)) {
+    // add to ts
+    throw new Error(`Can't map non-array value: ${values}`);
+  }
+
+  return values.map((v, i) => callFn(fn, [v, i], frame));
+};
+
+export const nameToSBUILTIN: Record<string, SBUILTIN> = {
+  call: V_SBUITLIN_Call,
+  map: V_SBUILTIN_Map,
+};