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https://github.com/eliasstepanik/strudel-docker.git
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44 lines
2.1 KiB
JavaScript
44 lines
2.1 KiB
JavaScript
/*
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evaluate.mjs - <short description TODO>
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Copyright (C) 2022 Strudel contributors - see <https://github.com/tidalcycles/strudel/blob/main/packages/eval/evaluate.mjs>
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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/>.
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*/
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import shapeshifter from './shapeshifter.mjs';
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import * as strudel from '@strudel.cycles/core';
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const { isPattern, Pattern } = strudel;
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export const extend = (...args) => {
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console.warn('@strudel.cycles/eval extend is deprecated, please use evalScopep instead');
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Object.assign(globalThis, ...args);
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};
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let scoped = false;
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export const evalScope = async (...args) => {
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if (scoped) {
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console.warn('@strudel.cycles/eval evalScope was called more than once.');
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}
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scoped = true;
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const modules = await Promise.all(args);
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Object.assign(globalThis, ...modules, Pattern.prototype.bootstrap());
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};
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function safeEval(str) {
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return Function('"use strict";return (' + str + ')')();
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}
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export const evaluate = async (code) => {
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if (!scoped) {
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await evalScope(); // at least scope Pattern.prototype.boostrap
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}
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const shapeshifted = shapeshifter(code); // transform syntactically correct js code to semantically usable code
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let evaluated = await safeEval(shapeshifted);
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if (!isPattern(evaluated)) {
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console.log('evaluated', evaluated);
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const message = `got "${typeof evaluated}" instead of pattern`;
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throw new Error(message + (typeof evaluated === 'function' ? ', did you forget to call a function?' : '.'));
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}
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return { mode: 'javascript', pattern: evaluated };
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};
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