@signalk/nmea0183-signalk
Version:
A node.js/javascript parser for NMEA0183 sentences. Sentences are parsed to Signal K format.
111 lines (109 loc) • 3.9 kB
JavaScript
;
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var __importStar = (this && this.__importStar) || (function () {
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})();
Object.defineProperty(exports, "__esModule", { value: true });
const utils = __importStar(require("@signalk/nmea0183-utilities"));
/*
* ZDA codec
*
* Copyright 2014, Mikko Vesikkala
*
* Licensed under the Apache License, Version 2.0 (the "License")
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/*
=== ZDA - Time & Date ===
------------------------------------------------------------------------------
*******1 2 3 4 5 6 7
*******| | | | | | |
$--ZDA,hhmmss.ss,xx,xx,xxxx,xx,xx*hh<CR><LF>
------------------------------------------------------------------------------
Field Number:
1. UTC time (hours, minutes, seconds, may have fractional subsecond)
2. Day, 01 to 31
3. Month, 01 to 12
4. Year (4 digits)
5. Local zone description, 00 to +- 13 hours
6. Local zone minutes description, apply same sign as local hours
7. Checksum
*/
function isEmpty(mixed) {
return typeof mixed !== 'string' || mixed.trim() === '';
}
const ZDA = function (input, _session) {
const { parts, tags } = input;
const empty = parts.reduce((e, val) => {
if (isEmpty(val)) {
++e;
}
return e;
}, 0);
if (empty > 3) {
return null;
}
const time = parts[0] || '';
const date = parts[1] + parts[2] + (parts[3] || '').slice(-2);
if (time.length >= 6 && date.length === 6 && empty < 3) {
return {
updates: [
{
source: tags.source,
timestamp: tags.timestamp,
values: [
{
path: 'navigation.datetime',
value: utils.timestamp(time, date)
}
]
}
]
};
}
// Preserve historical behaviour: return an empty object (as any) when the
// fields do not form a complete datetime. The `{}` value is cast so strict
// typing still holds for the Delta | null return.
return {};
};
exports.default = ZDA;
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