react-vis/es/utils/scales-utils.js

Data visualization library based on React and d3.

var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

var _SCALE_FUNCTIONS;

function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

// Copyright (c) 2016 - 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

import { scaleLinear, scalePoint, scaleOrdinal, scaleLog, scaleTime, scaleUtc } from 'd3-scale';
import { extent } from 'd3-array';
import { set } from 'd3-collection';
import { hsl } from 'd3-color';

import PropTypes from 'prop-types';

import { warning } from './react-utils';
import { getUniquePropertyValues, addValueToArray } from './data-utils';

/**
 * Linear scale name.
 * @type {string}
 * @const
 */
var LINEAR_SCALE_TYPE = 'linear';

/**
 * Ordinal scale name.
 * @type {string}
 * @const
 */
var ORDINAL_SCALE_TYPE = 'ordinal';

/**
 * Category scale.
 * @type {string}
 * @const
 */
var CATEGORY_SCALE_TYPE = 'category';

/**
 * Literal scale.
 * Differs slightly from d3's identity scale in that it does not coerce value
 * into numbers, it simply returns exactly what you give it
 * @type {string}
 * @const
 */
var LITERAL_SCALE_TYPE = 'literal';

/**
 * Log scale name.
 * @type {string}
 * @const
 */
var LOG_SCALE_TYPE = 'log';

/**
 * Time scale name.
 * @type {string}
 * @const
 */
var TIME_SCALE_TYPE = 'time';

/**
 * Time UTC scale name.
 * @type {string}
 * @const
 */
var TIME_UTC_SCALE_TYPE = 'time-utc';

/**
 * Scale functions that are supported in the library.
 * @type {Object}
 * @const
 */
var SCALE_FUNCTIONS = (_SCALE_FUNCTIONS = {}, _defineProperty(_SCALE_FUNCTIONS, LINEAR_SCALE_TYPE, scaleLinear), _defineProperty(_SCALE_FUNCTIONS, ORDINAL_SCALE_TYPE, scalePoint), _defineProperty(_SCALE_FUNCTIONS, CATEGORY_SCALE_TYPE, scaleOrdinal), _defineProperty(_SCALE_FUNCTIONS, LITERAL_SCALE_TYPE, literalScale), _defineProperty(_SCALE_FUNCTIONS, LOG_SCALE_TYPE, scaleLog), _defineProperty(_SCALE_FUNCTIONS, TIME_SCALE_TYPE, scaleTime), _defineProperty(_SCALE_FUNCTIONS, TIME_UTC_SCALE_TYPE, scaleUtc), _SCALE_FUNCTIONS);

/**
 * Attrs for which a scale can be set up at XYPlot level
 * @type {Array}
 * @const
 */

var XYPLOT_ATTR = ['color', 'fill', 'opacity', 'stroke'];

/**
 * Title case a given string
 * @param {String} str Array of values.
 * @returns {String} titlecased string
 */
function toTitleCase(str) {
  return '' + str[0].toUpperCase() + str.slice(1);
}

/**
 * Find the smallest distance between the values on a given scale and return
 * the index of the element, where the smallest distance was found.
 * It returns the first occurrence of i where
 * `scale(value[i]) - scale(value[i - 1])` is minimal
 * @param {Array} values Array of values.
 * @param {Object} scaleObject Scale object.
 * @returns {number} Index of an element where the smallest distance was found.
 * @private
 */
export function _getSmallestDistanceIndex(values, scaleObject) {
  var scaleFn = getScaleFnFromScaleObject(scaleObject);
  var result = 0;
  if (scaleFn) {
    var nextValue = void 0;
    var currentValue = scaleFn(values[0]);
    var distance = Infinity;
    var nextDistance = void 0;

    for (var i = 1; i < values.length; i++) {
      nextValue = scaleFn(values[i]);
      nextDistance = Math.abs(nextValue - currentValue);
      if (nextDistance < distance) {
        distance = nextDistance;
        result = i;
      }
      currentValue = nextValue;
    }
  }
  return result;
}

/**
 * Crate a scale function from the scale object.
 * @param {Object} scaleObject Scale object.
 - scaleObject.domain {Array}
 - scaleObject.range {Array}
 - scaleObject.type {string}
 - scaleObject.attr {string}
 * @returns {*} Scale function.
 * @private
 */
export function getScaleFnFromScaleObject(scaleObject) {
  if (!scaleObject) {
    return null;
  }
  var type = scaleObject.type,
      domain = scaleObject.domain,
      range = scaleObject.range;

  var modDomain = domain[0] === domain[1] ? domain[0] === 0 ? [-1, 0] : [-domain[0], domain[0]] : domain;
  if (type === LITERAL_SCALE_TYPE) {
    return literalScale(range[0]);
  }
  var scale = SCALE_FUNCTIONS[type]().domain(modDomain).range(range);
  if (type === ORDINAL_SCALE_TYPE) {
    scale.padding(0.5);
  }
  return scale;
}

/**
 * Get the domain from the array of data.
 * @param {Array} allData All data.
 * @param {function} accessor - accessor for main value.
 * @param {function} accessor0 - accessor for the naught value.
 * @param {string} type Scale type.
 * @returns {Array} Domain.
 * @private
 */
export function getDomainByAccessor(allData, accessor, accessor0, type) {
  var domain = void 0;

  // Collect both attr and available attr0 values from the array of data.
  var values = allData.reduce(function (data, d) {
    var value = accessor(d);
    var value0 = accessor0(d);
    if (_isDefined(value)) {
      data.push(value);
    }
    if (_isDefined(value0)) {
      data.push(value0);
    }
    return data;
  }, []);

  if (!values.length) {
    return [];
  }

  // Create proper domain depending on the type of the scale.
  if (type !== ORDINAL_SCALE_TYPE && type !== CATEGORY_SCALE_TYPE) {
    domain = extent(values);
  } else {
    domain = set(values).values();
  }
  return domain;
}

/**
 * Create custom scale object from the value. When the scale is created from
 * this object, it should return the same value all time.
 * @param {string} attr Attribute.
 * @param {*} value Value.
 * @param {string} type - the type of scale being used
 * @param {function} accessor - the accessor function
 * @param {function} accessor0 - the accessor function for the potential naught value
 * @returns {Object} Custom scale object.
 * @private
 */
function _createScaleObjectForValue(attr, value, type, accessor, accessor0) {
  if (type === LITERAL_SCALE_TYPE) {
    return {
      type: LITERAL_SCALE_TYPE,
      domain: [],
      range: [value],
      distance: 0,
      attr: attr,
      baseValue: undefined,
      isValue: true,
      accessor: accessor,
      accessor0: accessor0
    };
  }
  if (typeof value === 'undefined') {
    return null;
  }
  return {
    type: CATEGORY_SCALE_TYPE,
    range: [value],
    domain: [],
    distance: 0,
    attr: attr,
    baseValue: undefined,
    isValue: true,
    accessor: accessor,
    accessor0: accessor0
  };
}

/**
 * Create a regular scale object for a further use from the existing parameters.
 * @param {Array} domain - Domain.
 * @param {Array} range - Range.
 * @param {string} type - Type.
 * @param {number} distance - Distance.
 * @param {string} attr - Attribute.
 * @param {number} baseValue - Base value.
 * @param {function} accessor - Attribute accesor
 * @param {function} accessor0 - Attribute accesor for potential naught value
 * @returns {Object} Scale object.
 * @private
 */
function _createScaleObjectForFunction(_ref) {
  var domain = _ref.domain,
      range = _ref.range,
      type = _ref.type,
      distance = _ref.distance,
      attr = _ref.attr,
      baseValue = _ref.baseValue,
      accessor = _ref.accessor,
      accessor0 = _ref.accessor0;

  return {
    domain: domain,
    range: range,
    type: type,
    distance: distance,
    attr: attr,
    baseValue: baseValue,
    isValue: false,
    accessor: accessor,
    accessor0: accessor0
  };
}

/**
 * Get scale object from props. E. g. object like {xRange, xDomain, xDistance,
 * xType} is transformed into {range, domain, distance, type}.
 * @param {Object} props Props.
 * @param {string} attr Attribute.
 * @returns {*} Null or an object with the scale.
 * @private
 */
function _collectScaleObjectFromProps(props, attr) {
  var value = props[attr],
      fallbackValue = props['_' + attr + 'Value'],
      range = props[attr + 'Range'],
      _props$ = props[attr + 'Distance'],
      distance = _props$ === undefined ? 0 : _props$,
      baseValue = props[attr + 'BaseValue'],
      _props$2 = props[attr + 'Type'],
      type = _props$2 === undefined ? LINEAR_SCALE_TYPE : _props$2,
      noFallBack = props[attr + 'NoFallBack'],
      _props$3 = props['get' + toTitleCase(attr)],
      accessor = _props$3 === undefined ? function (d) {
    return d[attr];
  } : _props$3,
      _props$4 = props['get' + toTitleCase(attr) + '0'],
      accessor0 = _props$4 === undefined ? function (d) {
    return d[attr + '0'];
  } : _props$4;
  var domain = props[attr + 'Domain'];
  // Return value-based scale if the value is assigned.

  if (!noFallBack && typeof value !== 'undefined') {
    return _createScaleObjectForValue(attr, value, props[attr + 'Type'], accessor, accessor0);
  }
  // Pick up the domain from the properties and create a new one if it's not
  // available.
  if (typeof baseValue !== 'undefined') {
    domain = addValueToArray(domain, baseValue);
  }

  // Make sure that the minimum necessary properties exist.
  if (!range || !domain || !domain.length) {
    // Try to use the fallback value if it is available.
    return _createScaleObjectForValue(attr, fallbackValue, props[attr + 'Type'], accessor, accessor0);
  }

  return _createScaleObjectForFunction({
    domain: domain,
    range: range,
    type: type,
    distance: distance,
    attr: attr,
    baseValue: baseValue,
    accessor: accessor,
    accessor0: accessor0
  });
}

/**
 * Compute left domain adjustment for the given values.
 * @param {Array} values Array of values.
 * @returns {number} Domain adjustment.
 * @private
 */
function _computeLeftDomainAdjustment(values) {
  if (values.length > 1) {
    return (values[1] - values[0]) / 2;
  }
  if (values.length === 1) {
    return values[0] - 0.5;
  }
  return 0;
}

/**
 * Compute right domain adjustment for the given values.
 * @param {Array} values Array of values.
 * @returns {number} Domain adjustment.
 * @private
 */
function _computeRightDomainAdjustment(values) {
  if (values.length > 1) {
    return (values[values.length - 1] - values[values.length - 2]) / 2;
  }
  if (values.length === 1) {
    return values[0] - 0.5;
  }
  return 0;
}

/**
 * Compute distance for the given values.
 * @param {Array} values Array of values.
 * @param {Array} domain Domain.
 * @param {number} bestDistIndex Index of a best distance found.
 * @param {function} scaleFn Scale function.
 * @returns {number} Domain adjustment.
 * @private
 */
function _computeScaleDistance(values, domain, bestDistIndex, scaleFn) {
  if (values.length > 1) {
    // Avoid zero indexes.
    var i = Math.max(bestDistIndex, 1);
    return Math.abs(scaleFn(values[i]) - scaleFn(values[i - 1]));
  }
  if (values.length === 1) {
    return Math.abs(scaleFn(domain[1]) - scaleFn(domain[0]));
  }
  return 0;
}

/**
 * Normilize array of values with a single value.
 * @param {Array} arr Array of data.
 * @param {Array} values Array of values.
 * @param {string} attr Attribute.
 * @param {string} type Type.
 * @private
 */
function _normalizeValues(data, values, accessor0, type) {
  if (type === TIME_SCALE_TYPE && values.length === 1) {
    var attr0 = accessor0(data[0]);

    return [attr0].concat(_toConsumableArray(values));
  }

  return values;
}

/**
 * Get the distance, the smallest and the largest value of the domain.
 * @param {Array} data Array of data for the single series.
 * @param {Object} scaleObject Scale object.
 * @returns {{domain0: number, domainN: number, distance: number}} Result.
 * @private
 */
export function _getScaleDistanceAndAdjustedDomain(data, scaleObject) {
  var domain = scaleObject.domain,
      type = scaleObject.type,
      accessor = scaleObject.accessor,
      accessor0 = scaleObject.accessor0;


  var uniqueValues = getUniquePropertyValues(data, accessor);

  // Fix time scale if a data has only one value.
  var values = _normalizeValues(data, uniqueValues, accessor0, type);
  var index = _getSmallestDistanceIndex(values, scaleObject);

  var adjustedDomain = [].concat(domain);

  adjustedDomain[0] -= _computeLeftDomainAdjustment(values);
  adjustedDomain[domain.length - 1] += _computeRightDomainAdjustment(values);
  // Fix log scale if it's too small.
  if (type === LOG_SCALE_TYPE && domain[0] <= 0) {
    adjustedDomain[0] = Math.min(domain[1] / 10, 1);
  }

  var adjustedScaleFn = getScaleFnFromScaleObject(_extends({}, scaleObject, {
    domain: adjustedDomain
  }));

  var distance = _computeScaleDistance(values, adjustedDomain, index, adjustedScaleFn);

  return {
    domain0: adjustedDomain[0],
    domainN: adjustedDomain[adjustedDomain.length - 1],
    distance: distance
  };
}

/**
 * Returns true if scale adjustments are possible for a given scale.
 * @param {Object} props Props.
 * @param {Object} scaleObject Scale object.
 * @returns {boolean} True if scale adjustments possible.
 * @private
 */
function _isScaleAdjustmentPossible(props, scaleObject) {
  var attr = scaleObject.attr;
  var _props$_adjustBy = props._adjustBy,
      adjustBy = _props$_adjustBy === undefined ? [] : _props$_adjustBy,
      _props$_adjustWhat = props._adjustWhat,
      adjustWhat = _props$_adjustWhat === undefined ? [] : _props$_adjustWhat;

  // The scale cannot be adjusted if there's no attributes to adjust, no
  // suitable values

  return adjustWhat.length && adjustBy.length && adjustBy.indexOf(attr) !== -1;
}

/**
 * Adjust continuous scales (e.g. 'linear', 'log' and 'time') by adding the
 * space from the left and right of them and by computing the best distance.
 * @param {Object} props Props.
 * @param {Object} scaleObject Scale object.
 * @returns {*} Scale object with adjustments.
 * @private
 */
function _adjustContinuousScale(props, scaleObject) {
  var allSeriesData = props._allData,
      _props$_adjustWhat2 = props._adjustWhat,
      adjustWhat = _props$_adjustWhat2 === undefined ? [] : _props$_adjustWhat2;

  // Assign the initial values.

  var domainLength = scaleObject.domain.length;
  var domain = scaleObject.domain;

  var scaleDomain0 = domain[0];
  var scaleDomainN = domain[domainLength - 1];
  var scaleDistance = scaleObject.distance;

  // Find the smallest left position of the domain, the largest right position
  // of the domain and the best distance for them.
  allSeriesData.forEach(function (data, index) {
    if (adjustWhat.indexOf(index) === -1) {
      return;
    }
    if (data && data.length) {
      var _getScaleDistanceAndA = _getScaleDistanceAndAdjustedDomain(data, scaleObject),
          domain0 = _getScaleDistanceAndA.domain0,
          domainN = _getScaleDistanceAndA.domainN,
          distance = _getScaleDistanceAndA.distance;

      scaleDomain0 = Math.min(scaleDomain0, domain0);
      scaleDomainN = Math.max(scaleDomainN, domainN);
      scaleDistance = Math.max(scaleDistance, distance);
    }
  });

  scaleObject.domain = [scaleDomain0].concat(_toConsumableArray(domain.slice(1, -1)), [scaleDomainN]);

  scaleObject.distance = scaleDistance;

  return scaleObject;
}

/**
 * Get an adjusted scale. Suitable for 'category' and 'ordinal' scales.
 * @param {Object} scaleObject Scale object.
 * @returns {*} Scale object with adjustments.
 * @private
 */
export function _adjustCategoricalScale(scaleObject) {
  var scaleFn = getScaleFnFromScaleObject(scaleObject);
  var domain = scaleObject.domain,
      range = scaleObject.range;

  if (domain.length > 1) {
    scaleObject.distance = Math.abs(scaleFn(domain[1]) - scaleFn(domain[0]));
  } else {
    scaleObject.distance = Math.abs(range[1] - range[0]);
  }

  return scaleObject;
}

/**
 * Retrieve a scale object or a value from the properties passed.
 * @param {Object} props Object of props.
 * @param {string} attr Attribute.
 * @returns {*} Scale object, value or null.
 */
export function getScaleObjectFromProps(props, attr) {
  // Create the initial scale object.
  var scaleObject = _collectScaleObjectFromProps(props, attr);
  if (!scaleObject) {
    return null;
  }

  // Make sure if it's possible to add space to the scale object. If not,
  // return the object immediately.
  if (!_isScaleAdjustmentPossible(props, scaleObject)) {
    return scaleObject;
  }

  var type = scaleObject.type;
  // Depending on what type the scale is, apply different adjustments. Distances
  // for the ordinal and category scales are even, equal domains cannot be
  // adjusted.

  if (type === ORDINAL_SCALE_TYPE || type === CATEGORY_SCALE_TYPE) {
    return _adjustCategoricalScale(scaleObject);
  }
  return _adjustContinuousScale(props, scaleObject);
}

/**
 * Get d3 scale for a given prop.
 * @param {Object} props Props.
 * @param {string} attr Attribute.
 * @returns {function} d3 scale function.
 */
export function getAttributeScale(props, attr) {
  var scaleObject = getScaleObjectFromProps(props, attr);
  return getScaleFnFromScaleObject(scaleObject);
}

/**
 * Get the value of `attr` from the object.
 * @param {Object} d - data Object.
 * @param {Function} accessor - accessor function.
 * @returns {*} Value of the point.
 * @private
 */
function _getAttrValue(d, accessor) {
  return accessor(d.data ? d.data : d);
}

function _isDefined(value) {
  return typeof value !== 'undefined';
}

/*
 * Adds a percentage of padding to a given domain
 * @param {Array} domain X or Y domain to pad.
 * @param {Number} padding Percentage of padding to add to domain
 * @returns {Array} Padded Domain
 */
function _padDomain(domain, padding) {
  if (!domain) {
    return domain;
  }
  if (isNaN(parseFloat(domain[0])) || isNaN(parseFloat(domain[1]))) {
    return domain;
  }

  var _domain = _slicedToArray(domain, 2),
      min = _domain[0],
      max = _domain[1];

  var domainPadding = (max - min) * (padding * 0.01);
  return [min - domainPadding, max + domainPadding];
}

/**
 * Get prop functor (either a value or a function) for a given attribute.
 * @param {Object} props Series props.
 * @param {Function} accessor - Property accessor.
 * @returns {*} Function or value.
 */
export function getAttributeFunctor(props, attr) {
  var scaleObject = getScaleObjectFromProps(props, attr);
  if (scaleObject) {
    var scaleFn = getScaleFnFromScaleObject(scaleObject);
    return function (d) {
      return scaleFn(_getAttrValue(d, scaleObject.accessor));
    };
  }
  return null;
}

/**
 * Get the functor which extracts value form [attr]0 property. Use baseValue if
 * no attr0 property for a given object is defined. Fall back to domain[0] if no
 * base value is available.
 * @param {Object} props Object of props.
 * @param {string} attr Attribute name.
 * @returns {*} Function which returns value or null if no values available.
 */
export function getAttr0Functor(props, attr) {
  var scaleObject = getScaleObjectFromProps(props, attr);
  if (scaleObject) {
    var domain = scaleObject.domain;
    var _scaleObject$baseValu = scaleObject.baseValue,
        baseValue = _scaleObject$baseValu === undefined ? domain[0] : _scaleObject$baseValu;

    var scaleFn = getScaleFnFromScaleObject(scaleObject);
    return function (d) {
      var value = _getAttrValue(d, scaleObject.accessor0);
      return scaleFn(_isDefined(value) ? value : baseValue);
    };
  }
  return null;
}

/**
 * Tries to get the string|number value of the attr and falls back to
 * a fallback property in case if the value is a scale.
 * @param {Object} props Series props.
 * @param {string} attr Property name.
 * @returns {*} Function or value.
 */
export function getAttributeValue(props, attr) {
  var scaleObject = getScaleObjectFromProps(props, attr);
  if (scaleObject) {
    if (!scaleObject.isValue && props['_' + attr + 'Value'] === undefined) {
      warning('[React-vis] Cannot use data defined ' + attr + ' for this ' + 'series type. Using fallback value instead.');
    }
    return props['_' + attr + 'Value'] || scaleObject.range[0];
  }
  return null;
}

/**
 * Get prop types by the attribute.
 * @param {string} attr Attribute.
 * @returns {Object} Object of xDomain, xRange, xType, xDistance and _xValue,
 * where x is an attribute passed to the function.
 */
export function getScalePropTypesByAttribute(attr) {
  var _ref2;

  return _ref2 = {}, _defineProperty(_ref2, '_' + attr + 'Value', PropTypes.any), _defineProperty(_ref2, attr + 'Domain', PropTypes.array), _defineProperty(_ref2, 'get' + toTitleCase(attr), PropTypes.func), _defineProperty(_ref2, 'get' + toTitleCase(attr) + '0', PropTypes.func), _defineProperty(_ref2, attr + 'Range', PropTypes.array), _defineProperty(_ref2, attr + 'Type', PropTypes.oneOf(Object.keys(SCALE_FUNCTIONS))), _defineProperty(_ref2, attr + 'Distance', PropTypes.number), _defineProperty(_ref2, attr + 'BaseValue', PropTypes.any), _ref2;
}

/**
 * Extract the list of scale properties from the entire props object.
 * @param {Object} props Props.
 * @param {Array<String>} attributes Array of attributes for the given
 * components (for instance, `['x', 'y', 'color']`).
 * @returns {Object} Collected props.
 */
export function extractScalePropsFromProps(props, attributes) {
  var result = {};
  Object.keys(props).forEach(function (key) {
    // this filtering is critical for extracting the correct accessors!
    var attr = attributes.find(function (a) {
      // width
      var isPlainSet = key.indexOf(a) === 0;
      // Ex: _data
      var isUnderscoreSet = key.indexOf('_' + a) === 0;
      // EX: getX
      var usesGet = key.indexOf('get' + toTitleCase(a)) === 0;
      return isPlainSet || isUnderscoreSet || usesGet;
    });
    if (!attr) {
      return;
    }
    result[key] = props[key];
  });
  return result;
}

/**
 * Extract the missing scale props from the given data and return them as
 * an object.
 * @param {Object} props Props.
 * @param {Array} data Array of all data.
 * @param {Array<String>} attributes Array of attributes for the given
 * components (for instance, `['x', 'y', 'color']`).
 * @returns {Object} Collected props.
 */
export function getMissingScaleProps(props, data, attributes) {
  var result = {};
  // Make sure that the domain is set pad it if specified
  attributes.forEach(function (attr) {
    if (!props['get' + toTitleCase(attr)]) {
      result['get' + toTitleCase(attr)] = function (d) {
        return d[attr];
      };
    }
    if (!props['get' + toTitleCase(attr) + '0']) {
      result['get' + toTitleCase(attr) + '0'] = function (d) {
        return d[attr + '0'];
      };
    }
    if (!props[attr + 'Domain']) {
      result[attr + 'Domain'] = getDomainByAccessor(data, props['get' + toTitleCase(attr)] || result['get' + toTitleCase(attr)], props['get' + toTitleCase(attr) + '0'] || result['get' + toTitleCase(attr) + '0'], props[attr + 'Type']);
      if (props[attr + 'Padding']) {
        result[attr + 'Domain'] = _padDomain(result[attr + 'Domain'], props[attr + 'Padding']);
      }
    }
  });

  return result;
}

/**
 * Return a d3 scale that returns the literal value that was given to it
 * @returns {function} literal scale.
 */
export function literalScale(defaultValue) {
  function scale(d) {
    if (d === undefined) {
      return defaultValue;
    }
    return d;
  }

  function response() {
    return scale;
  }

  scale.domain = response;
  scale.range = response;
  scale.unknown = response;
  scale.copy = response;

  return scale;
}

export function getFontColorFromBackground(background) {
  if (background) {
    return hsl(background).l > 0.57 ? '#222' : '#fff';
  }
  return null;
}

/**
 * Creates fallback values for series from scales defined at XYPlot level.
 * @param {Object} props Props of the XYPlot object.
 * @param {Array<Object>} children Array of components, children of XYPlot
 * @returns {Array<Object>} Collected props.
 */

export function getXYPlotValues(props, children) {
  var XYPlotScales = XYPLOT_ATTR.reduce(function (prev, attr) {
    var domain = props[attr + 'Domain'],
        range = props[attr + 'Range'],
        type = props[attr + 'Type'];


    if (domain && range && type) {
      return _extends({}, prev, _defineProperty({}, attr, SCALE_FUNCTIONS[type]().domain(domain).range(range)));
    }
    return prev;
  }, {});

  return children.map(function (child) {
    return XYPLOT_ATTR.reduce(function (prev, attr) {
      if (child.props && child.props[attr] !== undefined) {
        var scaleInput = child.props[attr];
        var scale = XYPlotScales[attr];
        var fallbackValue = scale ? scale(scaleInput) : scaleInput;
        return _extends({}, prev, _defineProperty({}, '_' + attr + 'Value', fallbackValue));
      }
      return prev;
    }, {});
  });
}

var OPTIONAL_SCALE_PROPS = ['Padding'];
var OPTIONAL_SCALE_PROPS_REGS = OPTIONAL_SCALE_PROPS.map(function (str) {
  return new RegExp(str + '$', 'i');
});
/**
 * Get the list of optional scale-related settings for XYPlot
 * mostly just used to find padding properties
 * @param {Object} props Object of props.
 * @returns {Object} Optional Props.
 * @private
 */
export function getOptionalScaleProps(props) {
  return Object.keys(props).reduce(function (acc, prop) {
    var propIsNotOptional = OPTIONAL_SCALE_PROPS_REGS.every(function (reg) {
      return !prop.match(reg);
    });
    if (propIsNotOptional) {
      return acc;
    }
    acc[prop] = props[prop];
    return acc;
  }, {});
}

export default {
  extractScalePropsFromProps: extractScalePropsFromProps,
  getAttributeScale: getAttributeScale,
  getAttributeFunctor: getAttributeFunctor,
  getAttr0Functor: getAttr0Functor,
  getAttributeValue: getAttributeValue,
  getDomainByAccessor: getDomainByAccessor,
  getFontColorFromBackground: getFontColorFromBackground,
  getMissingScaleProps: getMissingScaleProps,
  getOptionalScaleProps: getOptionalScaleProps,
  getScaleObjectFromProps: getScaleObjectFromProps,
  getScalePropTypesByAttribute: getScalePropTypesByAttribute,
  getXYPlotValues: getXYPlotValues,
  literalScale: literalScale
};