74 lines
1.8 KiB
JavaScript
74 lines
1.8 KiB
JavaScript
let outputIndex = 0;
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export function getOutputIndex() {
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return outputIndex;
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}
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async function withTemporaryGlobalScope(callback) {
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let state = {
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oldValues: {},
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set(key, value) {
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this.oldValues[key] = globalThis[key];
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globalThis[key] = value;
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}
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};
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await callback(state);
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for (let key in state.oldValues) {
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globalThis[key] = state.oldValues[key];
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}
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}
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let evaluationComplete = null;
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export async function evaluate(commands, { start, success, error }) {
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if (evaluationComplete != null) {
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await evaluationComplete;
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}
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if (start != null) {
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start();
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}
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let signalEvaluationComplete;
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evaluationComplete = new Promise((resolve, _reject) => {
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signalEvaluationComplete = resolve;
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})
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outputIndex = 0;
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try {
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await withTemporaryGlobalScope(async scope => {
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for (let command of commands) {
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if (command.kind == "module") {
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let blobUrl = URL.createObjectURL(new Blob([command.source], { type: "text/javascript" }));
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let module = await import(blobUrl);
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for (let exportedKey in module) {
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scope.set(exportedKey, module[exportedKey]);
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}
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} else if (command.kind == "output") {
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++outputIndex;
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}
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}
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});
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if (success != null) {
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success();
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}
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postMessage({
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kind: "evalComplete",
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});
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} catch (err) {
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postMessage({
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kind: "output",
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output: {
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kind: "error",
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message: [err.toString()],
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},
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outputIndex,
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});
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if (error != null) {
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error();
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}
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}
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signalEvaluationComplete();
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}
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