mapcomplete/Logic/MetaTagging.ts

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import LayerConfig from "../Customizations/JSON/LayerConfig";
import SimpleMetaTagger from "./SimpleMetaTagger";
import {ExtraFunction} from "./ExtraFunction";
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/**
* Metatagging adds various tags to the elements, e.g. lat, lon, surface area, ...
*
* All metatags start with an underscore
*/
export default class MetaTagging {
/**
* An actor which adds metatags on every feature in the given object
* The features are a list of geojson-features, with a "properties"-field and geometry
*/
static addMetatags(features: { feature: any; freshness: Date }[], layers: LayerConfig[]) {
for (const metatag of SimpleMetaTagger.metatags) {
try {
metatag.addMetaTags(features);
} catch (e) {
console.error("Could not calculate metatag for ", metatag.keys.join(","), ":", e)
}
}
// The functions - per layer - which add the new keys
const layerFuncs = new Map<string, ((featursPerLayer: Map<string, any[]>, feature: any) => void)>();
for (const layer of layers) {
layerFuncs.set(layer.id, this.createRetaggingFunc(layer));
}
const featuresPerLayer = new Map<string, any[]>();
for (const feature of features) {
const key = feature.feature._matching_layer_id;
if (!featuresPerLayer.has(key)) {
featuresPerLayer.set(key, [])
}
featuresPerLayer.get(key).push(feature.feature)
}
for (const feature of features) {
// @ts-ignore
const key = feature.feature._matching_layer_id;
const f = layerFuncs.get(key);
if (f === undefined) {
continue;
}
f(featuresPerLayer, feature.feature)
}
}
private static createRetaggingFunc(layer: LayerConfig): ((featuresPerLayer: Map<string, any[]>, feature: any) => void) {
const calculatedTags: [string, string][] = layer.calculatedTags;
if (calculatedTags === undefined) {
return undefined;
}
const functions: ((featuresPerLayer: Map<string, any[]>, feature: any) => void)[] = [];
for (const entry of calculatedTags) {
const key = entry[0]
const code = entry[1];
if (code === undefined) {
continue;
}
const func = new Function("feat", "return " + code + ";");
const f = (featuresPerLayer, feature: any) => {
feature.properties[key] = func(feature);
}
functions.push(f)
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}
return (featuresPerLayer: Map<string, any[]>, feature) => {
const tags = feature.properties
if (tags === undefined) {
return;
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}
ExtraFunction.FullPatchFeature(featuresPerLayer, feature);
try {
for (const f of functions) {
f(featuresPerLayer, feature);
}
} catch (e) {
console.error("While calculating a tag value: ", e)
}
}
}
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}