overpass-frontend/src/evaluator/disjunction.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 EvaluatorOperator = require('../EvaluatorOperator')
const evaluatorHelper = require('../evaluatorHelper')

module.exports = class EvaluatorOperatorDisjunction extends EvaluatorOperator {
  eval (context) {
    let left = this.left.eval(context)
    let right = this.right.eval(context)
    if (evaluatorHelper.isNumber(left) && evaluatorHelper.isNumber(right)) {
      left = parseFloat(left)
      right = parseFloat(right)
    }
    return left || right
  }

  toString (options) {
    return this.left.toString(options) + '||' + this.right.toString(options)
  }

  priority () {
    return 7
  }

  compileLokiJS () {
    const left = this.left.compileLokiJS()
    const right = this.right.compileLokiJS()

    if ('value' in left) {
      return left.value ? { value: true } : right
    }

    const leftNeedMatch = left.needMatch
    const rightNeedMatch = right.needMatch
    delete left.needMatch
    delete right.needMatch
    const leftKeys = Object.keys(left)
    const rightKeys = Object.keys(right)

    if (!leftKeys.length && rightKeys.length) {
      right.needMatch = !!(left.needMatch || right.needMatch)
      return right
    }
    if (leftKeys.length && !rightKeys.length) {
      left.needMatch = !!(left.needMatch || right.needMatch)
      return left
    }

    return { $or: [left, right], needMatch: !!(leftNeedMatch || rightNeedMatch) }
  }

  isSupersetOf (other) {
    const r = super.isSupersetOf(other)
    if (r !== undefined) {
      return r
    }

    if (this.left.isSupersetOf(other) || this.right.isSupersetOf(other)) {
      return true
    }
  }

  cacheDescriptors (descriptors) {
    const copy = JSON.parse(JSON.stringify(descriptors))
    this.left.cacheDescriptors(descriptors)
    this.right.cacheDescriptors(copy)
    descriptors.push(...copy)
  }
}