85 lines
1.6 KiB
JavaScript
85 lines
1.6 KiB
JavaScript
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'use strict';
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var assert = require('assert');
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var filter = require('arr-filter');
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var map = require('arr-map');
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var flatten = require('arr-flatten');
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var forEach = require('array-each');
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function noop() {}
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function getExtensions(lastArg) {
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if (typeof lastArg !== 'function') {
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return lastArg;
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}
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}
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function filterSuccess(elem) {
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return elem.state === 'success';
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}
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function filterError(elem) {
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return elem.state === 'error';
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}
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function buildOnSettled(done) {
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if (typeof done !== 'function') {
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done = noop;
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}
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function onSettled(error, result) {
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if (error) {
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return done(error, null);
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}
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var settledErrors = filter(result, filterError);
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var settledResults = filter(result, filterSuccess);
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var errors = null;
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if (settledErrors.length) {
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errors = map(settledErrors, 'value');
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}
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var results = null;
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if (settledResults.length) {
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results = map(settledResults, 'value');
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}
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done(errors, results);
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}
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return onSettled;
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}
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function verifyArguments(args) {
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args = flatten(args);
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var lastIdx = args.length - 1;
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assert.ok(args.length, 'A set of functions to combine is required');
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forEach(args, function(arg, argIdx) {
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var isFunction = typeof arg === 'function';
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if (isFunction) {
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return;
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}
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if (argIdx === lastIdx) {
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// Last arg can be an object of extension points
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return;
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}
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var msg = 'Only functions can be combined, got ' + typeof arg +
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' for argument ' + argIdx;
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assert.ok(isFunction, msg);
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});
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return args;
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}
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module.exports = {
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getExtensions: getExtensions,
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onSettled: buildOnSettled,
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verifyArguments: verifyArguments,
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};
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