57 lines
1.8 KiB
JavaScript
57 lines
1.8 KiB
JavaScript
import crypto from 'node:crypto';
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import { simplify } from './simplify.js';
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// We want the identifiers to be useable in url strings and other places,
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// and avoid any unicode or right-to-left surprises,
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// so limit them to /^\w+$/ (only [A-Za-z0-9_] characters)
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export function idgen(item, tkv, locationID) {
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let name;
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const parts = tkv.split('/', 3); // tkv = "tree/key/value"
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const t = parts[0];
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// run through the list of tags looking for a suitable name
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let osmtags;
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if (t === 'transit') {
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osmtags = ['name', 'name:en', 'network', 'network:en', 'operator', 'operator:en', 'brand', 'brand:en'];
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} else if (t === 'operators') {
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osmtags = ['name', 'name:en', 'operator', 'operator:en', 'brand', 'brand:en', 'network', 'network:en'];
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} else if (t === 'flags') {
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osmtags = ['flag:name', 'subject'];
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} else { // brands
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osmtags = ['name', 'name:en', 'brand', 'brand:en', 'operator', 'operator:en', 'network', 'network:en'];
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}
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// First attempt, pick a name that matches /^\w+$/
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for (let i = 0; i < osmtags.length; i++) {
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let tryname = item.tags[osmtags[i]];
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if (!tryname) continue;
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tryname = simplify(tryname);
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if (/^\w+$/.test(tryname)) {
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name = tryname;
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break;
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}
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}
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// If that didn't work, try again but just create a short hash for it.
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if (!name) {
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for (let i = 0; i < osmtags.length; i++) {
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const tryname = item.tags[osmtags[i]];
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if (!tryname) continue;
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const message = simplify(tryname);
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name = crypto.createHash('md5').update(message).digest('hex').slice(0, 6);
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break;
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}
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}
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if (name && tkv && locationID) {
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const message = `${tkv} ${locationID}`;
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const hash = crypto.createHash('md5').update(message).digest('hex').slice(0, 6);
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return `${name}-${hash}`;
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} else {
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return null;
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}
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}
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