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feat: Add support for advanced VIS LW remark decoding

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Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>
This commit is contained in:
Tanner Collin
2026-02-14 17:08:31 -07:00
parent 4551aef2de
commit 75cb5327d3
1 changed files with 54 additions and 13 deletions
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metar.html
+48 -7
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@@ -492,10 +492,37 @@
},
// VIS
{
match: p => p[0] === 'VIS' && p.length > 2 && (isDirection(p[1]) || (p[1] === 'LW' && p.length > 3 && isDirection(p[3]))),
match: p => p[0] === 'VIS' && p.length > 2 && (isDirection(p[1]) || (p[1] === 'LW' && p.length > 3 && (isDirection(p[2]) || isDirection(p[3])))),
decode: p => {
// VIS LW <visibility> <direction>
// VIS LW ...
if (p[1] === 'LW') {
// VIS LW <direction> <visibility>... (new format)
if (isDirection(p[2])) {
const direction = p[2];
let vis_parts = [p[3]];
let vis_consumed = 1;
if (p.length > 4) {
if (p[4] === 'SM') { // "3 SM"
vis_parts.push(p[4]);
vis_consumed++;
} else if (p[3].match(/^\d+$/) && p[4].match(/^\d+\/\d+SM$/)) { // "1 1/2SM"
vis_parts.push(p[4]);
vis_consumed++;
}
}
const raw_vis = vis_parts.join(' ');
const raw_remark = ['VIS', 'LW', direction, raw_vis].join(' ');
const visibility = raw_vis.replace('SM', '');
return {
consumed: 3 + vis_consumed,
text: ` - ${raw_remark}: Visibility locally worse, ${visibility} statute miles to the ${decodeDirection(direction).replace(/ to /g, '-')}`
};
}
// VIS LW <visibility> <direction> (old format)
if (isDirection(p[3])) {
const visibility = p[2].replace('SM', '');
const direction = p[3];
return {
@@ -503,20 +530,34 @@
text: ` - VIS LW ${p[2]} ${direction}: Visibility locally worse, ${visibility} statute miles to the ${decodeDirection(direction).replace(/ to /g, '-')}`
};
}
}
// VIS <direction> <visibility>
if (isDirection(p[1])) {
const visibility = p[2].replace('SM', '');
const direction = p[1];
const raw_vis = p[2];
let consumed = 3;
let vis_parts = [p[2]];
let vis_consumed = 1;
if (p.length > 3) {
if (p[3] === 'SM') { // "3 SM"
vis_parts.push(p[3]);
vis_consumed++;
} else if (p[2].match(/^\d+$/) && p[3].match(/^\d+\/\d+SM$/)) { // "1 1/2SM"
vis_parts.push(p[3]);
vis_consumed++;
}
}
const raw_vis = vis_parts.join(' ');
const visibility = raw_vis.replace('SM', '');
let consumed = 2 + vis_consumed;
let raw_parts = ['VIS', direction, raw_vis];
let text_parts = [];
text_parts.push(`Visibility ${decodeDirection(direction)} ${visibility} miles`);
if (p.length > 3 && p[3] === 'INTMT') {
consumed = 4;
if (p.length > (2 + vis_consumed) && p[2 + vis_consumed] === 'INTMT') {
consumed++;
raw_parts.push('INTMT');
text_parts.push('intermittent');
}