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95 lines
2.9 KiB
95 lines
2.9 KiB
2 years ago
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const npm = {
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stat: require('./static')
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};
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module.exports = function ($p) {
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const exp = {
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formatError: npm.stat.formatError,
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isPromise: npm.stat.isPromise,
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isReadableStream: npm.stat.isReadableStream,
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messageGap: npm.stat.messageGap,
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extend: npm.stat.extend,
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resolve: resolve,
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wrap: wrap
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};
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return exp;
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//////////////////////////////////////////
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// Checks if the function is a generator,
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// and if so - wraps it up into a promise;
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function wrap(func) {
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if (typeof func === 'function') {
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if (func.constructor.name === 'GeneratorFunction') {
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return asyncAdapter(func);
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}
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return func;
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}
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return null;
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}
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/////////////////////////////////////////////////////
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// Resolves a mixed value into the actual value,
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// consistent with the way mixed values are defined:
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// https://github.com/vitaly-t/spex/wiki/Mixed-Values
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function resolve(value, params, onSuccess, onError) {
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const self = this;
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let delayed = false;
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function loop() {
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while (typeof value === 'function') {
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if (value.constructor.name === 'GeneratorFunction') {
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value = asyncAdapter(value);
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}
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try {
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value = params ? value.apply(self, params) : value.call(self);
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} catch (e) {
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onError(e, false); // false means 'threw an error'
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return;
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}
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}
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if (exp.isPromise(value)) {
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value
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.then(data => {
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delayed = true;
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value = data;
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loop();
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return null; // this dummy return is just to prevent Bluebird warnings;
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})
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.catch(error => {
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onError(error, true); // true means 'rejected'
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});
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} else {
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onSuccess(value, delayed);
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}
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}
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loop();
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}
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// Generator-to-Promise adapter;
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// Based on: https://www.promisejs.org/generators/#both
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function asyncAdapter(generator) {
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return function () {
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const g = generator.apply(this, arguments);
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function handle(result) {
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if (result.done) {
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return $p.resolve(result.value);
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}
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return $p.resolve(result.value)
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.then(res => {
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return handle(g.next(res));
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}, err => {
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return handle(g.throw(err));
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});
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}
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return handle(g.next());
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};
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}
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};
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