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