number.js

var zrUtil = require("zrender/lib/core/util");

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/
var RADIAN_EPSILON = 1e-4;

function _trim(str) {
  return str.replace(/^\s+/, '').replace(/\s+$/, '');
}
/**
 * Linear mapping a value from domain to range
 * @memberOf module:echarts/util/number
 * @param  {(number|Array.<number>)} val
 * @param  {Array.<number>} domain Domain extent domain[0] can be bigger than domain[1]
 * @param  {Array.<number>} range  Range extent range[0] can be bigger than range[1]
 * @param  {boolean} clamp
 * @return {(number|Array.<number>}
 */


function linearMap(val, domain, range, clamp) {
  var subDomain = domain[1] - domain[0];
  var subRange = range[1] - range[0];

  if (subDomain === 0) {
    return subRange === 0 ? range[0] : (range[0] + range[1]) / 2;
  } // Avoid accuracy problem in edge, such as
  // 146.39 - 62.83 === 83.55999999999999.
  // See echarts/test/ut/spec/util/number.js#linearMap#accuracyError
  // It is a little verbose for efficiency considering this method
  // is a hotspot.


  if (clamp) {
    if (subDomain > 0) {
      if (val <= domain[0]) {
        return range[0];
      } else if (val >= domain[1]) {
        return range[1];
      }
    } else {
      if (val >= domain[0]) {
        return range[0];
      } else if (val <= domain[1]) {
        return range[1];
      }
    }
  } else {
    if (val === domain[0]) {
      return range[0];
    }

    if (val === domain[1]) {
      return range[1];
    }
  }

  return (val - domain[0]) / subDomain * subRange + range[0];
}
/**
 * Convert a percent string to absolute number.
 * Returns NaN if percent is not a valid string or number
 * @memberOf module:echarts/util/number
 * @param {string|number} percent
 * @param {number} all
 * @return {number}
 */


function parsePercent(percent, all) {
  switch (percent) {
    case 'center':
    case 'middle':
      percent = '50%';
      break;

    case 'left':
    case 'top':
      percent = '0%';
      break;

    case 'right':
    case 'bottom':
      percent = '100%';
      break;
  }

  if (typeof percent === 'string') {
    if (_trim(percent).match(/%$/)) {
      return parseFloat(percent) / 100 * all;
    }

    return parseFloat(percent);
  }

  return percent == null ? NaN : +percent;
}
/**
 * (1) Fix rounding error of float numbers.
 * (2) Support return string to avoid scientific notation like '3.5e-7'.
 *
 * @param {number} x
 * @param {number} [precision]
 * @param {boolean} [returnStr]
 * @return {number|string}
 */


function round(x, precision, returnStr) {
  if (precision == null) {
    precision = 10;
  } // Avoid range error


  precision = Math.min(Math.max(0, precision), 20);
  x = (+x).toFixed(precision);
  return returnStr ? x : +x;
}

function asc(arr) {
  arr.sort(function (a, b) {
    return a - b;
  });
  return arr;
}
/**
 * Get precision
 * @param {number} val
 */


function getPrecision(val) {
  val = +val;

  if (isNaN(val)) {
    return 0;
  } // It is much faster than methods converting number to string as follows
  //      var tmp = val.toString();
  //      return tmp.length - 1 - tmp.indexOf('.');
  // especially when precision is low


  var e = 1;
  var count = 0;

  while (Math.round(val * e) / e !== val) {
    e *= 10;
    count++;
  }

  return count;
}
/**
 * @param {string|number} val
 * @return {number}
 */


function getPrecisionSafe(val) {
  var str = val.toString(); // Consider scientific notation: '3.4e-12' '3.4e+12'

  var eIndex = str.indexOf('e');

  if (eIndex > 0) {
    var precision = +str.slice(eIndex + 1);
    return precision < 0 ? -precision : 0;
  } else {
    var dotIndex = str.indexOf('.');
    return dotIndex < 0 ? 0 : str.length - 1 - dotIndex;
  }
}
/**
 * Minimal dicernible data precisioin according to a single pixel.
 *
 * @param {Array.<number>} dataExtent
 * @param {Array.<number>} pixelExtent
 * @return {number} precision
 */


function getPixelPrecision(dataExtent, pixelExtent) {
  var log = Math.log;
  var LN10 = Math.LN10;
  var dataQuantity = Math.floor(log(dataExtent[1] - dataExtent[0]) / LN10);
  var sizeQuantity = Math.round(log(Math.abs(pixelExtent[1] - pixelExtent[0])) / LN10); // toFixed() digits argument must be between 0 and 20.

  var precision = Math.min(Math.max(-dataQuantity + sizeQuantity, 0), 20);
  return !isFinite(precision) ? 20 : precision;
}
/**
 * Get a data of given precision, assuring the sum of percentages
 * in valueList is 1.
 * The largest remainer method is used.
 * https://en.wikipedia.org/wiki/Largest_remainder_method
 *
 * @param {Array.<number>} valueList a list of all data
 * @param {number} idx index of the data to be processed in valueList
 * @param {number} precision integer number showing digits of precision
 * @return {number} percent ranging from 0 to 100
 */


function getPercentWithPrecision(valueList, idx, precision) {
  if (!valueList[idx]) {
    return 0;
  }

  var sum = zrUtil.reduce(valueList, function (acc, val) {
    return acc + (isNaN(val) ? 0 : val);
  }, 0);

  if (sum === 0) {
    return 0;
  }

  var digits = Math.pow(10, precision);
  var votesPerQuota = zrUtil.map(valueList, function (val) {
    return (isNaN(val) ? 0 : val) / sum * digits * 100;
  });
  var targetSeats = digits * 100;
  var seats = zrUtil.map(votesPerQuota, function (votes) {
    // Assign automatic seats.
    return Math.floor(votes);
  });
  var currentSum = zrUtil.reduce(seats, function (acc, val) {
    return acc + val;
  }, 0);
  var remainder = zrUtil.map(votesPerQuota, function (votes, idx) {
    return votes - seats[idx];
  }); // Has remainding votes.

  while (currentSum < targetSeats) {
    // Find next largest remainder.
    var max = Number.NEGATIVE_INFINITY;
    var maxId = null;

    for (var i = 0, len = remainder.length; i < len; ++i) {
      if (remainder[i] > max) {
        max = remainder[i];
        maxId = i;
      }
    } // Add a vote to max remainder.


    ++seats[maxId];
    remainder[maxId] = 0;
    ++currentSum;
  }

  return seats[idx] / digits;
} // Number.MAX_SAFE_INTEGER, ie do not support.


var MAX_SAFE_INTEGER = 9007199254740991;
/**
 * To 0 - 2 * PI, considering negative radian.
 * @param {number} radian
 * @return {number}
 */

function remRadian(radian) {
  var pi2 = Math.PI * 2;
  return (radian % pi2 + pi2) % pi2;
}
/**
 * @param {type} radian
 * @return {boolean}
 */


function isRadianAroundZero(val) {
  return val > -RADIAN_EPSILON && val < RADIAN_EPSILON;
}

var TIME_REG = /^(?:(\d{4})(?:[-\/](\d{1,2})(?:[-\/](\d{1,2})(?:[T ](\d{1,2})(?::(\d\d)(?::(\d\d)(?:[.,](\d+))?)?)?(Z|[\+\-]\d\d:?\d\d)?)?)?)?)?$/; // jshint ignore:line

/**
 * @param {string|Date|number} value These values can be accepted:
 *   + An instance of Date, represent a time in its own time zone.
 *   + Or string in a subset of ISO 8601, only including:
 *     + only year, month, date: '2012-03', '2012-03-01', '2012-03-01 05', '2012-03-01 05:06',
 *     + separated with T or space: '2012-03-01T12:22:33.123', '2012-03-01 12:22:33.123',
 *     + time zone: '2012-03-01T12:22:33Z', '2012-03-01T12:22:33+8000', '2012-03-01T12:22:33-05:00',
 *     all of which will be treated as local time if time zone is not specified
 *     (see <https://momentjs.com/>).
 *   + Or other string format, including (all of which will be treated as loacal time):
 *     '2012', '2012-3-1', '2012/3/1', '2012/03/01',
 *     '2009/6/12 2:00', '2009/6/12 2:05:08', '2009/6/12 2:05:08.123'
 *   + a timestamp, which represent a time in UTC.
 * @return {Date} date
 */

function parseDate(value) {
  if (value instanceof Date) {
    return value;
  } else if (typeof value === 'string') {
    // Different browsers parse date in different way, so we parse it manually.
    // Some other issues:
    // new Date('1970-01-01') is UTC,
    // new Date('1970/01/01') and new Date('1970-1-01') is local.
    // See issue #3623
    var match = TIME_REG.exec(value);

    if (!match) {
      // return Invalid Date.
      return new Date(NaN);
    } // Use local time when no timezone offset specifed.


    if (!match[8]) {
      // match[n] can only be string or undefined.
      // But take care of '12' + 1 => '121'.
      return new Date(+match[1], +(match[2] || 1) - 1, +match[3] || 1, +match[4] || 0, +(match[5] || 0), +match[6] || 0, +match[7] || 0);
    } // Timezoneoffset of Javascript Date has considered DST (Daylight Saving Time,
    // https://tc39.github.io/ecma262/#sec-daylight-saving-time-adjustment).
    // For example, system timezone is set as "Time Zone: America/Toronto",
    // then these code will get different result:
    // `new Date(1478411999999).getTimezoneOffset();  // get 240`
    // `new Date(1478412000000).getTimezoneOffset();  // get 300`
    // So we should not use `new Date`, but use `Date.UTC`.
    else {
        var hour = +match[4] || 0;

        if (match[8].toUpperCase() !== 'Z') {
          hour -= match[8].slice(0, 3);
        }

        return new Date(Date.UTC(+match[1], +(match[2] || 1) - 1, +match[3] || 1, hour, +(match[5] || 0), +match[6] || 0, +match[7] || 0));
      }
  } else if (value == null) {
    return new Date(NaN);
  }

  return new Date(Math.round(value));
}
/**
 * Quantity of a number. e.g. 0.1, 1, 10, 100
 *
 * @param  {number} val
 * @return {number}
 */


function quantity(val) {
  return Math.pow(10, quantityExponent(val));
}

function quantityExponent(val) {
  return Math.floor(Math.log(val) / Math.LN10);
}
/**
 * find a “nice” number approximately equal to x. Round the number if round = true,
 * take ceiling if round = false. The primary observation is that the “nicest”
 * numbers in decimal are 1, 2, and 5, and all power-of-ten multiples of these numbers.
 *
 * See "Nice Numbers for Graph Labels" of Graphic Gems.
 *
 * @param  {number} val Non-negative value.
 * @param  {boolean} round
 * @return {number}
 */


function nice(val, round) {
  var exponent = quantityExponent(val);
  var exp10 = Math.pow(10, exponent);
  var f = val / exp10; // 1 <= f < 10

  var nf;

  if (round) {
    if (f < 1.5) {
      nf = 1;
    } else if (f < 2.5) {
      nf = 2;
    } else if (f < 4) {
      nf = 3;
    } else if (f < 7) {
      nf = 5;
    } else {
      nf = 10;
    }
  } else {
    if (f < 1) {
      nf = 1;
    } else if (f < 2) {
      nf = 2;
    } else if (f < 3) {
      nf = 3;
    } else if (f < 5) {
      nf = 5;
    } else {
      nf = 10;
    }
  }

  val = nf * exp10; // Fix 3 * 0.1 === 0.30000000000000004 issue (see IEEE 754).
  // 20 is the uppper bound of toFixed.

  return exponent >= -20 ? +val.toFixed(exponent < 0 ? -exponent : 0) : val;
}
/**
 * Order intervals asc, and split them when overlap.
 * expect(numberUtil.reformIntervals([
 *     {interval: [18, 62], close: [1, 1]},
 *     {interval: [-Infinity, -70], close: [0, 0]},
 *     {interval: [-70, -26], close: [1, 1]},
 *     {interval: [-26, 18], close: [1, 1]},
 *     {interval: [62, 150], close: [1, 1]},
 *     {interval: [106, 150], close: [1, 1]},
 *     {interval: [150, Infinity], close: [0, 0]}
 * ])).toEqual([
 *     {interval: [-Infinity, -70], close: [0, 0]},
 *     {interval: [-70, -26], close: [1, 1]},
 *     {interval: [-26, 18], close: [0, 1]},
 *     {interval: [18, 62], close: [0, 1]},
 *     {interval: [62, 150], close: [0, 1]},
 *     {interval: [150, Infinity], close: [0, 0]}
 * ]);
 * @param {Array.<Object>} list, where `close` mean open or close
 *        of the interval, and Infinity can be used.
 * @return {Array.<Object>} The origin list, which has been reformed.
 */


function reformIntervals(list) {
  list.sort(function (a, b) {
    return littleThan(a, b, 0) ? -1 : 1;
  });
  var curr = -Infinity;
  var currClose = 1;

  for (var i = 0; i < list.length;) {
    var interval = list[i].interval;
    var close = list[i].close;

    for (var lg = 0; lg < 2; lg++) {
      if (interval[lg] <= curr) {
        interval[lg] = curr;
        close[lg] = !lg ? 1 - currClose : 1;
      }

      curr = interval[lg];
      currClose = close[lg];
    }

    if (interval[0] === interval[1] && close[0] * close[1] !== 1) {
      list.splice(i, 1);
    } else {
      i++;
    }
  }

  return list;

  function littleThan(a, b, lg) {
    return a.interval[lg] < b.interval[lg] || a.interval[lg] === b.interval[lg] && (a.close[lg] - b.close[lg] === (!lg ? 1 : -1) || !lg && littleThan(a, b, 1));
  }
}
/**
 * parseFloat NaNs numeric-cast false positives (null|true|false|"")
 * ...but misinterprets leading-number strings, particularly hex literals ("0x...")
 * subtraction forces infinities to NaN
 *
 * @param {*} v
 * @return {boolean}
 */


function isNumeric(v) {
  return v - parseFloat(v) >= 0;
}

exports.linearMap = linearMap;
exports.parsePercent = parsePercent;
exports.round = round;
exports.asc = asc;
exports.getPrecision = getPrecision;
exports.getPrecisionSafe = getPrecisionSafe;
exports.getPixelPrecision = getPixelPrecision;
exports.getPercentWithPrecision = getPercentWithPrecision;
exports.MAX_SAFE_INTEGER = MAX_SAFE_INTEGER;
exports.remRadian = remRadian;
exports.isRadianAroundZero = isRadianAroundZero;
exports.parseDate = parseDate;
exports.quantity = quantity;
exports.nice = nice;
exports.reformIntervals = reformIntervals;
exports.isNumeric = isNumeric;