universe/src/expressions.js

The fastest way to query and explore multivariate datasets

'use strict'

// var moment = require('moment')

module.exports = {
  // Getters
  $field: $field,
  // Booleans
  $and: $and,
  $or: $or,
  $not: $not,

  // Expressions
  $eq: $eq,
  $gt: $gt,
  $gte: $gte,
  $lt: $lt,
  $lte: $lte,
  $ne: $ne,
  $type: $type,

  // Array Expressions
  $in: $in,
  $nin: $nin,
  $contains: $contains,
  $excludes: $excludes,
  $size: $size,
}

// Getters
function $field(d, child) {
  return d[child]
}

// Operators

function $and(d, child) {
  child = child(d)
  for (var i = 0; i < child.length; i++) {
    if (!child[i]) {
      return false
    }
  }
  return true
}

function $or(d, child) {
  child = child(d)
  for (var i = 0; i < child.length; i++) {
    if (child[i]) {
      return true
    }
  }
  return false
}

function $not(d, child) {
  child = child(d)
  for (var i = 0; i < child.length; i++) {
    if (child[i]) {
      return false
    }
  }
  return true
}

// Expressions

function $eq(d, child) {
  return d === child()
}

function $gt(d, child) {
  return d > child()
}

function $gte(d, child) {
  return d >= child()
}

function $lt(d, child) {
  return d < child()
}

function $lte(d, child) {
  return d <= child()
}

function $ne(d, child) {
  return d !== child()
}

function $type(d, child) {
  return typeof d === child()
}

// Array Expressions

function $in(d, child) {
  return d.indexOf(child()) > -1
}

function $nin(d, child) {
  return d.indexOf(child()) === -1
}

function $contains(d, child) {
  return child().indexOf(d) > -1
}

function $excludes(d, child) {
  return child().indexOf(d) === -1
}

function $size(d, child) {
  return d.length === child()
}