@rapideditor/location-conflation/dist/location-conflation.cjs.map

Define complex geographic regions by including and excluding country codes and geojson shapes

{
  "version": 3,
  "sources": ["../index.mjs"],
  "sourcesContent": ["import * as CountryCoder from '@rapideditor/country-coder';\nimport * as Polyclip from 'polyclip-ts';\n\nimport calcArea from '@mapbox/geojson-area';\nimport circleToPolygon  from 'circle-to-polygon';\nimport precision  from 'geojson-precision';\nimport prettyStringify from '@aitodotai/json-stringify-pretty-compact';\n\n\nexport class LocationConflation {\n\n  // constructor\n  //\n  // `fc`  Optional FeatureCollection of known features\n  //\n  // Optionally pass a GeoJSON FeatureCollection of known features which we can refer to later.\n  // Each feature must have a filename-like `id`, for example: `something.geojson`\n  //\n  // {\n  //   \"type\": \"FeatureCollection\"\n  //   \"features\": [\n  //     {\n  //       \"type\": \"Feature\",\n  //       \"id\": \"philly_metro.geojson\",\n  //       \"properties\": { \u2026 },\n  //       \"geometry\": { \u2026 }\n  //     }\n  //   ]\n  // }\n  constructor(fc) {\n    // The _cache retains resolved features, so if you ask for the same thing multiple times\n    // we don't repeat the expensive resolving/clipping operations.\n    //\n    // Each feature has a stable identifier that is used as the cache key.\n    // The identifiers look like:\n    // - for point locations, the stringified point:          e.g. '[8.67039,49.41882]'\n    // - for geojson locations, the geojson id:               e.g. 'de-hamburg.geojson'\n    // - for countrycoder locations, feature.id property:     e.g. 'Q2'  (countrycoder uses Wikidata identifiers)\n    // - for aggregated locationSets, +[include]-[exclude]:   e.g '+[Q2]-[Q18,Q27611]'\n    this._cache = {};\n\n    // When strict mode = true, throw on invalid locations or locationSets.\n    // When strict mode = false, return `null` for invalid locations or locationSets.\n    this.strict = true;\n\n    // process input FeatureCollection\n    if (fc && fc.type === 'FeatureCollection' && Array.isArray(fc.features)) {\n      fc.features.forEach(feature => {\n        feature.properties = feature.properties || {};\n        let props = feature.properties;\n\n        // Get `id` from either `id` or `properties`\n        let id = feature.id || props.id;\n        if (!id || !/^\\S+\\.geojson$/i.test(id)) return;\n\n        // Ensure `id` exists and is lowercase\n        id = id.toLowerCase();\n        feature.id = id;\n        props.id = id;\n\n        // Ensure `area` property exists\n        if (!props.area) {\n          const area = calcArea.geometry(feature.geometry) / 1e6;  // m\u00B2 to km\u00B2\n          props.area = Number(area.toFixed(2));\n        }\n\n        this._cache[id] = feature;\n      });\n    }\n\n    // Replace CountryCoder world geometry to be a polygon covering the world.\n    let world = _cloneDeep(CountryCoder.feature('Q2'));\n    world.geometry = {\n      type: 'Polygon',\n      coordinates: [[[-180, -90], [180, -90], [180, 90], [-180, 90], [-180, -90]]]\n    };\n    world.id = 'Q2';\n    world.properties.id = 'Q2';\n    world.properties.area = calcArea.geometry(world.geometry) / 1e6;  // m\u00B2 to km\u00B2\n    this._cache.Q2 = world;\n  }\n\n\n  // validateLocation\n  // `location`  The location to validate\n  //\n  // Pass a `location` value to validate\n  //\n  // Returns a result like:\n  //   {\n  //     type:     'point', 'geojson', or 'countrycoder'\n  //     location:  the queried location\n  //     id:        the stable identifier for the feature\n  //   }\n  // or `null` if the location is invalid\n  //\n  validateLocation(location) {\n    if (Array.isArray(location) && (location.length === 2 || location.length === 3)) {   // [lon, lat] or [lon, lat, radius] point?\n      const lon = location[0];\n      const lat = location[1];\n      const radius = location[2];\n      if (\n        Number.isFinite(lon) && lon >= -180 && lon <= 180 &&\n        Number.isFinite(lat) && lat >= -90 && lat <= 90 &&\n        (location.length === 2 || (Number.isFinite(radius) && radius > 0))\n      ) {\n        const id = '[' + location.toString() + ']';\n        return { type: 'point', location: location, id: id };\n      }\n\n    } else if (typeof location === 'string' && /^\\S+\\.geojson$/i.test(location)) {   // a .geojson filename?\n      const id = location.toLowerCase();\n      if (this._cache[id]) {\n        return { type: 'geojson', location: location, id: id };\n      }\n\n    } else if (typeof location === 'string' || typeof location === 'number') {   // a country-coder value?\n      const feature = CountryCoder.feature(location);\n      if (feature) {\n        // Use wikidata QID as the identifier, since that seems to be the one\n        // property that everything in CountryCoder is guaranteed to have.\n        const id = feature.properties.wikidata;\n        return { type: 'countrycoder', location: location, id: id };\n      }\n    }\n\n    if (this.strict) {\n      throw new Error(`validateLocation:  Invalid location: \"${location}\".`);\n    } else {\n      return null;\n    }\n  }\n\n\n  // resolveLocation\n  // `location`  The location to resolve\n  //\n  // Pass a `location` value to resolve\n  //\n  // Returns a result like:\n  //   {\n  //     type:      'point', 'geojson', or 'countrycoder'\n  //     location:  the queried location\n  //     id:        a stable identifier for the feature\n  //     feature:   the resolved GeoJSON feature\n  //   }\n  //  or `null` if the location is invalid\n  //\n  resolveLocation(location) {\n    const valid = this.validateLocation(location);\n    if (!valid) return null;\n\n    const id = valid.id;\n\n    // Return a result from cache if we can\n    if (this._cache[id]) {\n      return Object.assign(valid, { feature: this._cache[id] });\n    }\n\n    // A [lon,lat] coordinate pair?\n    if (valid.type === 'point') {\n      const lon = location[0];\n      const lat = location[1];\n      const radius = location[2] || 25;   // km\n      const EDGES = 10;\n      const PRECISION = 3;\n      const area = Math.PI * radius * radius;\n      const feature = this._cache[id] = precision({\n        type: 'Feature',\n        id: id,\n        properties: { id: id, area: Number(area.toFixed(2)) },\n        geometry: circleToPolygon([lon, lat], radius * 1000, EDGES)  // km to m\n      }, PRECISION);\n      return Object.assign(valid, { feature: feature });\n\n    // A .geojson filename?\n    } else if (valid.type === 'geojson') {\n      // nothing to do here - these are all in _cache and would have returned already\n\n    // A country-coder identifier?\n    } else if (valid.type === 'countrycoder') {\n      let feature = _cloneDeep(CountryCoder.feature(id));\n      let props = feature.properties;\n\n      // -> This block of code is weird and requires some explanation. <-\n      // CountryCoder includes higher level features which are made up of members.\n      // These features don't have their own geometry, but CountryCoder provides an\n      //   `aggregateFeature` method to combine these members into a MultiPolygon.\n      // In the past, Turf/JSTS/martinez could not handle the aggregated features,\n      //   so we'd iteratively union them all together.  (this was slow)\n      // But now mfogel/polygon-clipping handles these MultiPolygons like a boss.\n      // This approach also has the benefit of removing all the internal boaders and\n      //   simplifying the regional polygons a lot.\n      if (Array.isArray(props.members)) {\n        let aggregate = CountryCoder.aggregateFeature(id);\n        aggregate.geometry.coordinates = _clip([aggregate], 'UNION').geometry.coordinates;\n        feature.geometry = aggregate.geometry;\n      }\n\n      // Ensure `area` property exists\n      if (!props.area) {\n        const area = calcArea.geometry(feature.geometry) / 1e6;  // m\u00B2 to km\u00B2\n        props.area = Number(area.toFixed(2));\n      }\n\n      // Ensure `id` property exists\n      feature.id = id;\n      props.id = id;\n\n      this._cache[id] = feature;\n      return Object.assign(valid, { feature: feature });\n    }\n\n    if (this.strict) {\n      throw new Error(`resolveLocation:  Couldn't resolve location \"${location}\".`);\n    } else {\n      return null;\n    }\n  }\n\n\n  // validateLocationSet\n  // `locationSet`  the locationSet to validate\n  //\n  // Pass a locationSet Object to validate like:\n  //   {\n  //     include: [ Array of locations ],\n  //     exclude: [ Array of locations ]\n  //   }\n  //\n  // Returns a result like:\n  //   {\n  //     type:         'locationset'\n  //     locationSet:  the queried locationSet\n  //     id:           the stable identifier for the feature\n  //   }\n  // or `null` if the locationSet is invalid\n  //\n  validateLocationSet(locationSet) {\n    locationSet = locationSet || {};\n    const validator = this.validateLocation.bind(this);\n    let include = (locationSet.include || []).map(validator).filter(Boolean);\n    let exclude = (locationSet.exclude || []).map(validator).filter(Boolean);\n\n    if (!include.length) {\n      if (this.strict) {\n        throw new Error(`validateLocationSet:  LocationSet includes nothing.`);\n      } else {\n        // non-strict mode, replace an empty locationSet with one that includes \"the world\"\n        locationSet.include = ['Q2'];\n        include = [{ type: 'countrycoder', location: 'Q2', id: 'Q2' }];\n      }\n    }\n\n    // Generate stable identifier\n    include.sort(_sortLocations);\n    let id = '+[' + include.map(d => d.id).join(',') + ']';\n    if (exclude.length) {\n      exclude.sort(_sortLocations);\n      id += '-[' + exclude.map(d => d.id).join(',') + ']';\n    }\n\n    return { type: 'locationset', locationSet: locationSet, id: id };\n  }\n\n\n  // resolveLocationSet\n  // `locationSet`  the locationSet to resolve\n  //\n  // Pass a locationSet Object to validate like:\n  //   {\n  //     include: [ Array of locations ],\n  //     exclude: [ Array of locations ]\n  //   }\n  //\n  // Returns a result like:\n  //   {\n  //     type:         'locationset'\n  //     locationSet:  the queried locationSet\n  //     id:           the stable identifier for the feature\n  //     feature:      the resolved GeoJSON feature\n  //   }\n  // or `null` if the locationSet is invalid\n  //\n  resolveLocationSet(locationSet) {\n    locationSet = locationSet || {};\n    const valid = this.validateLocationSet(locationSet);\n    if (!valid) return null;\n\n    const id = valid.id;\n\n    // Return a result from cache if we can\n    if (this._cache[id]) {\n      return Object.assign(valid, { feature: this._cache[id] });\n    }\n\n    const resolver = this.resolveLocation.bind(this);\n    const includes = (locationSet.include || []).map(resolver).filter(Boolean);\n    const excludes = (locationSet.exclude || []).map(resolver).filter(Boolean);\n\n    // Return quickly if it's a single included location..\n    if (includes.length === 1 && excludes.length === 0) {\n      return Object.assign(valid, { feature: includes[0].feature });\n    }\n\n    // Calculate unions\n    const includeGeoJSON = _clip(includes.map(d => d.feature), 'UNION');\n    const excludeGeoJSON = _clip(excludes.map(d => d.feature), 'UNION');\n\n    // Calculate difference, update `area` and return result\n    let resultGeoJSON = excludeGeoJSON ? _clip([includeGeoJSON, excludeGeoJSON], 'DIFFERENCE') : includeGeoJSON;\n    const area = calcArea.geometry(resultGeoJSON.geometry) / 1e6;  // m\u00B2 to km\u00B2\n    resultGeoJSON.id = id;\n    resultGeoJSON.properties = { id: id, area: Number(area.toFixed(2)) };\n\n    this._cache[id] = resultGeoJSON;\n    return Object.assign(valid, { feature: resultGeoJSON });\n  }\n\n\n  // stringify\n  // convenience method to prettyStringify the given object\n  stringify(obj, options) {\n    return prettyStringify(obj, options);\n  }\n}\n\n\n// Wrap the https://github.com/luizbarboza/polyclip-ts library and return a GeoJSON feature.\nfunction _clip(features, which) {\n  if (!Array.isArray(features) || !features.length) return null;\n\n  const fn = { UNION: Polyclip.union, DIFFERENCE: Polyclip.difference }[which];\n  const args = features.map(feature => feature.geometry.coordinates);\n  const coords = fn.apply(null, args);\n  return {\n    type: 'Feature',\n    properties: {},\n    geometry: {\n      type: whichType(coords),\n      coordinates: coords\n    }\n  };\n\n  // is this a Polygon or a MultiPolygon?\n  function whichType(coords) {\n    const a = Array.isArray(coords);\n    const b = a && Array.isArray(coords[0]);\n    const c = b && Array.isArray(coords[0][0]);\n    const d = c && Array.isArray(coords[0][0][0]);\n    return d ? 'MultiPolygon' : 'Polygon';\n  }\n}\n\n\nfunction _cloneDeep(obj) {\n  return JSON.parse(JSON.stringify(obj));\n}\n\n\n// Sorting the location lists is ok because they end up unioned together.\n// This sorting makes it possible to generate a deterministic id.\nfunction _sortLocations(a, b) {\n  const rank = { countrycoder: 1, geojson: 2, point: 3 };\n  const aRank = rank[a.type];\n  const bRank = rank[b.type];\n\n  return (aRank > bRank) ? 1\n    : (aRank < bRank) ? -1\n    : a.id.localeCompare(b.id);\n}\n\nexport default LocationConflation;\n"],
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}