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commit
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node_modules
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"use strict";
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const Promise = require("bluebird");
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const { validateArguments } = require("@validatem/core");
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const required = require("@validatem/required");
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const isFunction = require("@validatem/is-function");
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const propagateAbort = require("@promistream/propagate-abort");
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const propagatePeek = require("@promistream/propagate-peek");
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module.exports = function mapFilter(_predicate) {
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let [ predicate ] = validateArguments(arguments, {
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predicate: [ required, isFunction ]
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});
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return {
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_promistreamVersion: 0,
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description: `map-filter stream`,
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abort: propagateAbort,
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peek: propagatePeek,
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read: function produceValue_mapFilterStream(source) {
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function attemptRead() {
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return Promise.try(() => {
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return source.read();
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}).then((result) => {
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return Promise.try(() => {
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return predicate(result);
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}).then((mappedItem) => {
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if (mappedItem === module.exports.NoValue) {
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return attemptRead();
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} else {
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return mappedItem;
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}
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});
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});
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}
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return attemptRead();
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}
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};
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};
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module.exports.NoValue = Symbol("NoValue");
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{
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"name": "@promistream/map-filter",
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"description": "A Promistream that's optimized for the 'map some items and throw away the rest' usecase",
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"version": "0.1.0",
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"main": "index.js",
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"keywords": [
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"promistream"
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],
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"repository": "http://git.cryto.net/joepie91/map-filter.git",
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"author": "Sven Slootweg <admin@cryto.net>",
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"license": "WTFPL OR CC0-1.0",
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"devDependencies": {
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"@joepie91/eslint-config": "^1.1.0",
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"eslint": "^6.8.0"
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},
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"dependencies": {
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"@promistream/propagate-abort": "^0.1.6",
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"@promistream/propagate-peek": "^0.1.1",
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"@validatem/core": "^0.3.15",
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"@validatem/is-function": "^0.1.0",
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"@validatem/required": "^0.1.1",
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"bluebird": "^3.7.2"
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}
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}
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