refactor(codemode): split interpreter and stdlib (#35572)

packages/codemode/src/stdlib/string.ts

@@ -0,0 +1,52 @@
+export const stringMethods = new Set([
+  "toLowerCase",
+  "toUpperCase",
+  "trim",
+  "trimStart",
+  "trimEnd",
+  "trimLeft",
+  "trimRight",
+  "split",
+  "slice",
+  "substring",
+  "substr",
+  "includes",
+  "startsWith",
+  "endsWith",
+  "indexOf",
+  "lastIndexOf",
+  "replace",
+  "replaceAll",
+  "repeat",
+  "padStart",
+  "padEnd",
+  "charAt",
+  "charCodeAt",
+  "codePointAt",
+  "at",
+  "concat",
+  "toString",
+  "match",
+  "matchAll",
+  "search",
+  "localeCompare",
+  "normalize",
+])
+
+export const stringStatics = new Set(["fromCharCode", "fromCodePoint"])
+
+export const invokeStringStatic = (name: string, args: Array<unknown>, node: AstNode): unknown => {
+  const codes = args.map((arg) => {
+    if (typeof arg !== "number") throw new InterpreterRuntimeError(`String.${name} expects number arguments.`, node)
+    return arg
+  })
+  switch (name) {
+    case "fromCharCode":
+      return String.fromCharCode(...codes)
+    case "fromCodePoint":
+      return String.fromCodePoint(...codes)
+    default:
+      throw new InterpreterRuntimeError(`String.${name} is not available in CodeMode.`, node)
+  }
+}
+import { type AstNode, InterpreterRuntimeError } from "../interpreter/model.js"