overpass-frontend/src/EvaluatorFunction.js

A JavaScript (NodeJS/Browser) library to easily access data from OpenStreetMap via Overpass API or from an OSM File. The objects can directly be used with LeafletJS or exported to GeoJSON. Data will be cached in the browser memory.

const evaluatorExport = require('./evaluatorExport')
const EvaluatorPart = require('./EvaluatorPart')
const EvaluatorValue = require('./EvaluatorValue')

module.exports = class EvaluatorFunction extends EvaluatorPart {
  constructor (fun, parameters) {
    super()
    this.fun = fun
    this.parameters = parameters
  }

  toJSON () {
    return { fun: this.fun, parameters: this.parameters.map(p => evaluatorExport(p)) }
  }

  toString (options) {
    const param = this.parameters.map(p => p.toString(options))
    return this.fun + '(' + param.join(',') + ')'
  }

  toValue () {
    return null
  }

  simplify () {
    const v = this.toValue()
    if (v !== null) {
      return new EvaluatorValue(v)
    }
    const param = this.parameters.map(p => p.simplify())
    return new this.constructor(this.fun, param)
  }

  compileLokiJS () {
    return { needMatch: true }
  }

  calcRequestProperties () {
    let result = this.requestProperties
    this.parameters.forEach(p => {
      result |= p.calcRequestProperties()
    })
    return result
  }
}