move evaluate logic without transpiler to core

+ breaking change: evalScope is now imported from core
+ breaking change: deprecated extend is now removed
+ add repl.mjs

packages/core/evaluate.mjs

@@ -0,0 +1,45 @@
+/*
+evaluate.mjs - <short description TODO>
+Copyright (C) 2022 Strudel contributors - see <https://github.com/tidalcycles/strudel/blob/main/packages/eval/evaluate.mjs>
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import * as strudel from '@strudel.cycles/core';
+
+const { isPattern, Pattern } = strudel;
+
+let scoped = false;
+export const evalScope = async (...args) => {
+  if (scoped) {
+    console.warn('evalScope was called more than once.');
+  }
+  scoped = true;
+  const results = await Promise.allSettled(args);
+  const modules = results.filter((result) => result.status === 'fulfilled').map((r) => r.value);
+  results.forEach((result, i) => {
+    if (result.status === 'rejected') {
+      console.warn(`evalScope: module with index ${i} could not be loaded:`, result.reason);
+    }
+  });
+  Object.assign(globalThis, ...modules, Pattern.prototype.bootstrap());
+};
+
+function safeEval(str) {
+  return Function('"use strict";return (' + str + ')')();
+}
+
+export const evaluate = async (code, transpiler) => {
+  if (!scoped) {
+    await evalScope(); // at least scope Pattern.prototype.boostrap
+  }
+  if (transpiler) {
+    code = transpiler(code); // transform syntactically correct js code to semantically usable code
+  }
+  let evaluated = await safeEval(code);
+  if (!isPattern(evaluated)) {
+    console.log('evaluated', evaluated);
+    const message = `got "${typeof evaluated}" instead of pattern`;
+    throw new Error(message + (typeof evaluated === 'function' ? ', did you forget to call a function?' : '.'));
+  }
+  return { mode: 'javascript', pattern: evaluated };
+};

packages/core/index.mjs

@@ -17,6 +17,7 @@ export * from './util.mjs';
 export * from './speak.mjs';
 export * from './clockworker.mjs';
 export * from './scheduler.mjs';
+export * from './evaluate.mjs';
 export { default as drawLine } from './drawLine.mjs';
 export { default as gist } from './gist.js';
 // below won't work with runtime.mjs (json import fails)

packages/core/repl.mjs

@@ -0,0 +1,23 @@
+import { Cyclist } from './cyclist.mjs';
+import { evaluate as _evaluate } from './evaluate.mjs';
+
+export function repl({ interval, defaultOutput, onSchedulerError, onEvalError, onEval, getTime, transpiler }) {
+  const scheduler = new Cyclist({ interval, onTrigger: defaultOutput, onError: onSchedulerError, getTime });
+  const evaluate = async (code) => {
+    if (!code) {
+      throw new Error('no code to evaluate');
+    }
+    try {
+      const { pattern } = await _evaluate(code, transpiler);
+      scheduler.setPattern(pattern);
+      onEval({
+        pattern,
+        code,
+      });
+    } catch (err) {
+      onEvalError?.(err);
+      console.warn('eval error', err);
+    }
+  };
+  return { scheduler, evaluate };
+}