winnow/lib/query/query.js

Apply sql-like filters to GeoJSON

const {
  create: createSqlStatement
} = require('../sql-query-builder')
const normalizeQueryOptions = require('../normalize-query-options')
const normalizeQueryInput = require('./normalize-query-input')
const classificationQuery = require('./classification-query')
const standardQuery = require('./standard-query')

module.exports = function (input, options = {}) {
  const { options: normalizedOptions, features } = normalizeFeaturesAndOptions(input, options)
  const { aggregates, classification } = normalizedOptions

  const sqlStatement = createSqlStatement(normalizedOptions)

  if (classification) return classificationQuery(features, sqlStatement, normalizedOptions)

  return standardQuery(features, sqlStatement, {
    skipLimitHandling: !!aggregates,
    ...normalizedOptions
  })
}

function normalizeFeaturesAndOptions (input, options) {
  if (isFeatureCollection(input)) {
    const { collection, features } = decoupleFeatureCollection(input)
    return {
      options: normalizeQueryOptions({ ...options, collection }, features),
      features
    }
  }

  const features = normalizeQueryInput(input)

  return {
    options: normalizeQueryOptions(options, features),
    features
  }
}

function decoupleFeatureCollection ({ features, ...collection }) {
  return { collection, features }
}

function isFeatureCollection (input) {
  return !!input.features
}