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66 lines
1.9 KiB
JavaScript
66 lines
1.9 KiB
JavaScript
"use strict";
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// FIXME: Document that this *may* not strip whitespace around text elements, and that it includes potentially-whitespace-only text elements between tags!
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const Promise = require("bluebird");
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const saxes = require("saxes");
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const consumable = require("@joepie91/consumable");
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const pEvent = require("p-event");
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const debug = require("debug")("promistream:parse-xml");
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const pipe = require("@promistream/pipe");
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const map = require("@promistream/map");
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const buffer = require("@promistream/buffer");
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const lastWill = require("@promistream/last-will");
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const { validateOptions, validateValue } = require("@validatem/core");
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const required = require("@validatem/required");
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const defaultTo = require("@validatem/default-to");
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const isString = require("@validatem/is-string");
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const allowExtraProperties = require("@validatem/allow-extra-properties");
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const arrayOf = require("@validatem/array-of");
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module.exports = function parseXML(_options) {
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let options = validateOptions(arguments, [
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defaultTo({}),
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allowExtraProperties({
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events: [ required, arrayOf(isString) ]
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})
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]);
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debug("Creating Saxes parser");
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let parser = new saxes.SaxesParser(options);
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let queue = consumable([]);
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let endEventPromise = pEvent(parser, "end");
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for (let eventName of options.events) {
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parser.on(eventName, (value) => {
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debug(`${eventName} event emitted by parser`);
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queue.peek().push({ type: eventName, value: value });
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});
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}
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return pipe([
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map((value) => {
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validateValue(value, [ isString ]); // FIXME: Turn this into a clearer error
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debug("Writing chunk to parser");
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parser.write(value);
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debug(`Returning ${queue.peek().length} parser items`);
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return queue.replace([]);
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}),
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lastWill({ onAllEnds: () => {
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return Promise.try(() => {
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parser.close();
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return endEventPromise;
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}).then(() => {
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debug("Parser finished processing");
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return queue.consume();
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});
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}}),
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buffer()
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]);
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};
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