Add settings page for managing forecasting API key and URL via UI

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/node_modules/recharts/lib/util/scale/CartesianScaleHelper.js

@@ -0,0 +1,65 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.CartesianScaleHelperImpl = void 0;
+/**
+ * Groups X and Y scale functions together and provides helper methods.
+ */
+class CartesianScaleHelperImpl {
+  constructor(_ref) {
+    var x = _ref.x,
+      y = _ref.y;
+    this.xAxisScale = x;
+    this.yAxisScale = y;
+  }
+  map(value, _ref2) {
+    var _this$xAxisScale$map, _this$yAxisScale$map;
+    var position = _ref2.position;
+    return {
+      x: (_this$xAxisScale$map = this.xAxisScale.map(value.x, {
+        position
+      })) !== null && _this$xAxisScale$map !== void 0 ? _this$xAxisScale$map : 0,
+      y: (_this$yAxisScale$map = this.yAxisScale.map(value.y, {
+        position
+      })) !== null && _this$yAxisScale$map !== void 0 ? _this$yAxisScale$map : 0
+    };
+  }
+  mapWithFallback(value, _ref3) {
+    var _this$xAxisScale$map2, _this$yAxisScale$map2;
+    var position = _ref3.position,
+      fallback = _ref3.fallback;
+    var fallbackY, fallbackX;
+    if (fallback === 'rangeMin') {
+      fallbackY = this.yAxisScale.rangeMin();
+    } else if (fallback === 'rangeMax') {
+      fallbackY = this.yAxisScale.rangeMax();
+    } else {
+      fallbackY = 0;
+    }
+    if (fallback === 'rangeMin') {
+      fallbackX = this.xAxisScale.rangeMin();
+    } else if (fallback === 'rangeMax') {
+      fallbackX = this.xAxisScale.rangeMax();
+    } else {
+      fallbackX = 0;
+    }
+    return {
+      x: (_this$xAxisScale$map2 = this.xAxisScale.map(value.x, {
+        position
+      })) !== null && _this$xAxisScale$map2 !== void 0 ? _this$xAxisScale$map2 : fallbackX,
+      y: (_this$yAxisScale$map2 = this.yAxisScale.map(value.y, {
+        position
+      })) !== null && _this$yAxisScale$map2 !== void 0 ? _this$yAxisScale$map2 : fallbackY
+    };
+  }
+  isInRange(_ref4) {
+    var x = _ref4.x,
+      y = _ref4.y;
+    var xInRange = x == null || this.xAxisScale.isInRange(x);
+    var yInRange = y == null || this.yAxisScale.isInRange(y);
+    return xInRange && yInRange;
+  }
+}
+exports.CartesianScaleHelperImpl = CartesianScaleHelperImpl;

frontend/node_modules/recharts/lib/util/scale/CustomScaleDefinition.js

@@ -0,0 +1 @@
+"use strict";

frontend/node_modules/recharts/lib/util/scale/RechartsScale.js

@@ -0,0 +1,72 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.rechartsScaleFactory = rechartsScaleFactory;
+/**
+ * This is internal representation of scale used in Recharts.
+ * Users will provide CustomScaleDefinition or a string, which we will parse into RechartsScale.
+ * Most importantly, RechartsScale is fully immutable - there are no setters that mutate the scale in place.
+ * This is important for React integration - if the scale changes, we want to trigger re-renders.
+ * Mutating the scale in place would not trigger re-renders, leading to stale UI.
+ */
+
+/**
+ * Position within a band for banded scales.
+ * In scales that are not banded, this parameter is ignored.
+ *
+ * @inline
+ */
+
+function rechartsScaleFactory(d3Scale) {
+  if (d3Scale == null) {
+    return undefined;
+  }
+  var ticksFn = d3Scale.ticks;
+  var bandwidthFn = d3Scale.bandwidth;
+  var d3Range = d3Scale.range();
+  var range = [Math.min(...d3Range), Math.max(...d3Range)];
+  return {
+    domain: () => d3Scale.domain(),
+    range: function (_range) {
+      function range() {
+        return _range.apply(this, arguments);
+      }
+      range.toString = function () {
+        return _range.toString();
+      };
+      return range;
+    }(() => range),
+    rangeMin: () => range[0],
+    rangeMax: () => range[1],
+    isInRange(value) {
+      var first = range[0];
+      var last = range[1];
+      return first <= last ? value >= first && value <= last : value >= last && value <= first;
+    },
+    bandwidth: bandwidthFn ? () => bandwidthFn.call(d3Scale) : undefined,
+    ticks: ticksFn ? count => ticksFn.call(d3Scale, count) : undefined,
+    map: (input, options) => {
+      var baseValue = d3Scale(input);
+      if (baseValue == null) {
+        return undefined;
+      }
+      if (d3Scale.bandwidth && options !== null && options !== void 0 && options.position) {
+        var bandWidth = d3Scale.bandwidth();
+        switch (options.position) {
+          case 'middle':
+            baseValue += bandWidth / 2;
+            break;
+          case 'end':
+            baseValue += bandWidth;
+            break;
+          default:
+            // 'start' requires no adjustment
+            break;
+        }
+      }
+      return baseValue;
+    }
+  };
+}

frontend/node_modules/recharts/lib/util/scale/createCategoricalInverse.js

@@ -0,0 +1,73 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.bisect = bisect;
+exports.createCategoricalInverse = createCategoricalInverse;
+/**
+ * Binary search to find the index where x would fit in array a.
+ * Works for arrays that are sorted both ascending and descending.
+ *
+ * Unlike d3.bisect, this implementation handles both ascending and descending arrays.
+ *
+ * @param haystack Sorted array of numbers
+ * @param needle Number to find the insertion index for
+ * @returns Index where x would fit in array a
+ */
+function bisect(haystack, needle) {
+  var lo = 0;
+  var hi = haystack.length;
+  var ascending = haystack[0] < haystack[haystack.length - 1];
+  while (lo < hi) {
+    var mid = Math.floor((lo + hi) / 2);
+    if (ascending ? haystack[mid] < needle : haystack[mid] > needle) {
+      lo = mid + 1;
+    } else {
+      hi = mid;
+    }
+  }
+  return lo;
+}
+
+/**
+ * Computes an inverse scale function for categorical/ordinal scales.
+ * Uses bisect to find the closest domain value for a given pixel coordinate.
+ */
+function createCategoricalInverse(scale, allDataPointsOnAxis) {
+  if (!scale) {
+    return undefined;
+  }
+  var domain = allDataPointsOnAxis !== null && allDataPointsOnAxis !== void 0 ? allDataPointsOnAxis : scale.domain();
+  // Build an array of pixel positions for each domain value
+  // @ts-expect-error we're attempting to scale unknown without having guarantee that it is a Domain type
+  var pixelPositions = domain.map(d => {
+    var _scale;
+    return (_scale = scale(d)) !== null && _scale !== void 0 ? _scale : 0;
+  });
+  var range = scale.range();
+  if (domain.length === 0 || range.length < 2) {
+    return undefined;
+  }
+  return pixelValue => {
+    var _pixelPositions, _pixelPositions$index;
+    // Find the closest domain value using bisect
+    var index = bisect(pixelPositions, pixelValue);
+
+    // Clamp to valid range
+    if (index <= 0) {
+      return domain[0];
+    }
+    if (index >= domain.length) {
+      return domain[domain.length - 1];
+    }
+
+    // Check which neighbor is closer
+    var leftPixel = (_pixelPositions = pixelPositions[index - 1]) !== null && _pixelPositions !== void 0 ? _pixelPositions : 0;
+    var rightPixel = (_pixelPositions$index = pixelPositions[index]) !== null && _pixelPositions$index !== void 0 ? _pixelPositions$index : 0;
+    if (Math.abs(pixelValue - leftPixel) <= Math.abs(pixelValue - rightPixel)) {
+      return domain[index - 1];
+    }
+    return domain[index];
+  };
+}

frontend/node_modules/recharts/lib/util/scale/getNiceTickValues.js

@@ -0,0 +1,294 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.getValidInterval = exports.getTickValuesFixedDomain = exports.getTickOfSingleValue = exports.getSnap125Step = exports.getNiceTickValues = exports.getAdaptiveStep = exports.calculateStep = void 0;
+var _decimal = _interopRequireDefault(require("decimal.js-light"));
+var _arithmetic = require("./util/arithmetic");
+function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
+function _slicedToArray(r, e) { return _arrayWithHoles(r) || _iterableToArrayLimit(r, e) || _unsupportedIterableToArray(r, e) || _nonIterableRest(); }
+function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
+function _unsupportedIterableToArray(r, a) { if (r) { if ("string" == typeof r) return _arrayLikeToArray(r, a); var t = {}.toString.call(r).slice(8, -1); return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0; } }
+function _arrayLikeToArray(r, a) { (null == a || a > r.length) && (a = r.length); for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e]; return n; }
+function _iterableToArrayLimit(r, l) { var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (null != t) { var e, n, i, u, a = [], f = !0, o = !1; try { if (i = (t = t.call(r)).next, 0 === l) { if (Object(t) !== t) return; f = !1; } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0); } catch (r) { o = !0, n = r; } finally { try { if (!f && null != t.return && (u = t.return(), Object(u) !== u)) return; } finally { if (o) throw n; } } return a; } }
+function _arrayWithHoles(r) { if (Array.isArray(r)) return r; } /**
+ * @fileOverview calculate tick values of scale
+ * @author xile611, arcthur
+ * @date 2015-09-17
+ */
+/**
+ * Calculate a interval of a minimum value and a maximum value
+ *
+ * @param  {Number} min       The minimum value
+ * @param  {Number} max       The maximum value
+ * @return {Array} An interval
+ */
+var getValidInterval = _ref => {
+  var _ref2 = _slicedToArray(_ref, 2),
+    min = _ref2[0],
+    max = _ref2[1];
+  var validMin = min,
+    validMax = max;
+
+  // exchange
+  if (min > max) {
+    validMin = max;
+    validMax = min;
+  }
+  return [validMin, validMax];
+};
+
+/**
+ * Calculate the step which is easy to understand between ticks, like 10, 20, 25
+ *
+ * @param  roughStep        The rough step calculated by dividing the difference by the tickCount
+ * @param  allowDecimals    Allow the ticks to be decimals or not
+ * @param  correctionFactor A correction factor
+ * @return The step which is easy to understand between two ticks
+ */
+exports.getValidInterval = getValidInterval;
+var getAdaptiveStep = (roughStep, allowDecimals, correctionFactor) => {
+  if (roughStep.lte(0)) {
+    return new _decimal.default(0);
+  }
+  var digitCount = (0, _arithmetic.getDigitCount)(roughStep.toNumber());
+  // The ratio between the rough step and the smallest number which has a bigger
+  // order of magnitudes than the rough step
+  var digitCountValue = new _decimal.default(10).pow(digitCount);
+  var stepRatio = roughStep.div(digitCountValue);
+  // When an integer and a float multiplied, the accuracy of result may be wrong
+  var stepRatioScale = digitCount !== 1 ? 0.05 : 0.1;
+  var amendStepRatio = new _decimal.default(Math.ceil(stepRatio.div(stepRatioScale).toNumber())).add(correctionFactor).mul(stepRatioScale);
+  var formatStep = amendStepRatio.mul(digitCountValue);
+  return allowDecimals ? new _decimal.default(formatStep.toNumber()) : new _decimal.default(Math.ceil(formatStep.toNumber()));
+};
+exports.getAdaptiveStep = getAdaptiveStep;
+/**
+ * The snap125 step algorithm snaps to nice numbers (1, 2, 2.5, 5) at each
+ * order of magnitude, producing human-friendly tick intervals like
+ * 0, 5, 10, 15, 20 instead of 0, 4, 8, 12, 16.
+ *
+ * This is opt-in and can be enabled via the `niceTicks` prop on axis components.
+ *
+ * @param  roughStep        The rough step calculated by dividing the difference by the tickCount
+ * @param  allowDecimals    Allow the ticks to be decimals or not
+ * @param  correctionFactor A correction factor
+ * @return The step which is easy to understand between two ticks
+ */
+var getSnap125Step = (roughStep, allowDecimals, correctionFactor) => {
+  var _NICE_STEPS$niceIdx;
+  if (roughStep.lte(0)) {
+    return new _decimal.default(0);
+  }
+  var NICE_STEPS = [1, 2, 2.5, 5];
+  var roughNum = roughStep.toNumber();
+  var exponent = Math.floor(new _decimal.default(roughNum).abs().log(10).toNumber());
+  var magnitude = new _decimal.default(10).pow(exponent);
+
+  // normalized is in the range [1, 10)
+  var normalized = roughStep.div(magnitude).toNumber();
+
+  // Find the smallest nice step >= normalized (ceiling)
+  var niceIdx = NICE_STEPS.findIndex(s => s >= normalized - 1e-10);
+  if (niceIdx === -1) {
+    // normalized > 5 (e.g. 7.3), move to next order of magnitude
+    magnitude = magnitude.mul(10);
+    niceIdx = 0;
+  }
+
+  // Apply correction factor by stepping through the nice number sequence
+  niceIdx += correctionFactor;
+  if (niceIdx >= NICE_STEPS.length) {
+    var extraMag = Math.floor(niceIdx / NICE_STEPS.length);
+    niceIdx %= NICE_STEPS.length;
+    magnitude = magnitude.mul(new _decimal.default(10).pow(extraMag));
+  }
+  var niceStep = (_NICE_STEPS$niceIdx = NICE_STEPS[niceIdx]) !== null && _NICE_STEPS$niceIdx !== void 0 ? _NICE_STEPS$niceIdx : 1;
+  var formatStep = new _decimal.default(niceStep).mul(magnitude);
+  return allowDecimals ? formatStep : new _decimal.default(Math.ceil(formatStep.toNumber()));
+};
+
+/**
+ * calculate the ticks when the minimum value equals to the maximum value
+ *
+ * @param  value         The minimum value which is also the maximum value
+ * @param  tickCount     The count of ticks
+ * @param  allowDecimals Allow the ticks to be decimals or not
+ * @return array of ticks
+ */
+exports.getSnap125Step = getSnap125Step;
+var getTickOfSingleValue = (value, tickCount, allowDecimals) => {
+  var step = new _decimal.default(1);
+  // calculate the middle value of ticks
+  var middle = new _decimal.default(value);
+  if (!middle.isint() && allowDecimals) {
+    var absVal = Math.abs(value);
+    if (absVal < 1) {
+      // The step should be a float number when the difference is smaller than 1
+      step = new _decimal.default(10).pow((0, _arithmetic.getDigitCount)(value) - 1);
+      middle = new _decimal.default(Math.floor(middle.div(step).toNumber())).mul(step);
+    } else if (absVal > 1) {
+      // Return the maximum integer which is smaller than 'value' when 'value' is greater than 1
+      middle = new _decimal.default(Math.floor(value));
+    }
+  } else if (value === 0) {
+    middle = new _decimal.default(Math.floor((tickCount - 1) / 2));
+  } else if (!allowDecimals) {
+    middle = new _decimal.default(Math.floor(value));
+  }
+  var middleIndex = Math.floor((tickCount - 1) / 2);
+  var ticks = [];
+  for (var i = 0; i < tickCount; i++) {
+    ticks.push(middle.add(new _decimal.default(i - middleIndex).mul(step)).toNumber());
+  }
+  return ticks;
+};
+
+/**
+ * Calculate the step
+ *
+ * @param  min              The minimum value of an interval
+ * @param  max              The maximum value of an interval
+ * @param  tickCount        The count of ticks
+ * @param  allowDecimals    Allow the ticks to be decimals or not
+ * @param  correctionFactor A correction factor
+ * @return The step, minimum value of ticks, maximum value of ticks
+ */
+exports.getTickOfSingleValue = getTickOfSingleValue;
+var _calculateStep = exports.calculateStep = function calculateStep(min, max, tickCount, allowDecimals) {
+  var correctionFactor = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : 0;
+  var stepFn = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : getAdaptiveStep;
+  // dirty hack (for recharts' test)
+  if (!Number.isFinite((max - min) / (tickCount - 1))) {
+    return {
+      step: new _decimal.default(0),
+      tickMin: new _decimal.default(0),
+      tickMax: new _decimal.default(0)
+    };
+  }
+
+  // The step which is easy to understand between two ticks
+  var step = stepFn(new _decimal.default(max).sub(min).div(tickCount - 1), allowDecimals, correctionFactor);
+
+  // A medial value of ticks
+  var middle;
+
+  // When 0 is inside the interval, 0 should be a tick
+  if (min <= 0 && max >= 0) {
+    middle = new _decimal.default(0);
+  } else {
+    // calculate the middle value
+    middle = new _decimal.default(min).add(max).div(2);
+    // minus modulo value
+    middle = middle.sub(new _decimal.default(middle).mod(step));
+  }
+  var belowCount = Math.ceil(middle.sub(min).div(step).toNumber());
+  var upCount = Math.ceil(new _decimal.default(max).sub(middle).div(step).toNumber());
+  var scaleCount = belowCount + upCount + 1;
+  if (scaleCount > tickCount) {
+    // When more ticks need to cover the interval, step should be bigger.
+    return _calculateStep(min, max, tickCount, allowDecimals, correctionFactor + 1, stepFn);
+  }
+  if (scaleCount < tickCount) {
+    // When less ticks can cover the interval, we should add some additional ticks
+    upCount = max > 0 ? upCount + (tickCount - scaleCount) : upCount;
+    belowCount = max > 0 ? belowCount : belowCount + (tickCount - scaleCount);
+  }
+  return {
+    step,
+    tickMin: middle.sub(new _decimal.default(belowCount).mul(step)),
+    tickMax: middle.add(new _decimal.default(upCount).mul(step))
+  };
+};
+
+/**
+ * Calculate the ticks of an interval. Ticks can appear outside the interval
+ * if it makes them more rounded and nice.
+ *
+ * @param tuple of [min,max] min: The minimum value, max: The maximum value
+ * @param tickCount     The count of ticks
+ * @param allowDecimals Allow the ticks to be decimals or not
+ * @param niceTicksMode The algorithm to use for calculating nice ticks.
+ * @return array of ticks
+ */
+var getNiceTickValues = exports.getNiceTickValues = function getNiceTickValues(_ref3) {
+  var _ref4 = _slicedToArray(_ref3, 2),
+    min = _ref4[0],
+    max = _ref4[1];
+  var tickCount = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 6;
+  var allowDecimals = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;
+  var niceTicksMode = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 'auto';
+  // More than two ticks should be return
+  var count = Math.max(tickCount, 2);
+  var _getValidInterval = getValidInterval([min, max]),
+    _getValidInterval2 = _slicedToArray(_getValidInterval, 2),
+    cormin = _getValidInterval2[0],
+    cormax = _getValidInterval2[1];
+  if (cormin === -Infinity || cormax === Infinity) {
+    var _values = cormax === Infinity ? [cormin, ...Array(tickCount - 1).fill(Infinity)] : [...Array(tickCount - 1).fill(-Infinity), cormax];
+    return min > max ? _values.reverse() : _values;
+  }
+  if (cormin === cormax) {
+    return getTickOfSingleValue(cormin, tickCount, allowDecimals);
+  }
+  var stepFn = niceTicksMode === 'snap125' ? getSnap125Step : getAdaptiveStep;
+
+  // Get the step between two ticks
+  var _calculateStep2 = _calculateStep(cormin, cormax, count, allowDecimals, 0, stepFn),
+    step = _calculateStep2.step,
+    tickMin = _calculateStep2.tickMin,
+    tickMax = _calculateStep2.tickMax;
+  var values = (0, _arithmetic.rangeStep)(tickMin, tickMax.add(new _decimal.default(0.1).mul(step)), step);
+  return min > max ? values.reverse() : values;
+};
+
+/**
+ * Calculate the ticks of an interval.
+ * Ticks will be constrained to the interval [min, max] even if it makes them less rounded and nice.
+ *
+ * @param tuple of [min,max] min: The minimum value, max: The maximum value
+ * @param tickCount     The count of ticks. This function may return less than tickCount ticks if the interval is too small.
+ * @param allowDecimals Allow the ticks to be decimals or not
+ * @param niceTicksMode          The algorithm to use for calculating nice ticks. See {@link NiceTicksAlgorithm}.
+ * @return array of ticks
+ */
+var getTickValuesFixedDomain = exports.getTickValuesFixedDomain = function getTickValuesFixedDomain(_ref5, tickCount) {
+  var _ref6 = _slicedToArray(_ref5, 2),
+    min = _ref6[0],
+    max = _ref6[1];
+  var allowDecimals = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;
+  var niceTicksMode = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 'auto';
+  // More than two ticks should be return
+  var _getValidInterval3 = getValidInterval([min, max]),
+    _getValidInterval4 = _slicedToArray(_getValidInterval3, 2),
+    cormin = _getValidInterval4[0],
+    cormax = _getValidInterval4[1];
+  if (cormin === -Infinity || cormax === Infinity) {
+    return [min, max];
+  }
+  if (cormin === cormax) {
+    return [cormin];
+  }
+  var stepFn = niceTicksMode === 'snap125' ? getSnap125Step : getAdaptiveStep;
+  var count = Math.max(tickCount, 2);
+  var step = stepFn(new _decimal.default(cormax).sub(cormin).div(count - 1), allowDecimals, 0);
+  var values = [...(0, _arithmetic.rangeStep)(new _decimal.default(cormin), new _decimal.default(cormax), step), cormax];
+  if (allowDecimals === false) {
+    /*
+     * allowDecimals is false means that we want to have integer ticks.
+     * The step is guaranteed to be an integer in the code above which is great start
+     * but when the first step is not an integer, it will start stepping from a decimal value anyway.
+     * So we need to round all the values to integers after the fact.
+     * The domain boundary (cormax) is appended after the rangeStep values. When
+     * cormax rounds down to the same integer as the last rangeStep value, we end up
+     * with a duplicate trailing tick. Remove it.
+     */
+    values = values.map(value => Math.round(value));
+    var last = values.length - 1;
+    if (last > 0 && values[last] === values[last - 1]) {
+      values = values.slice(0, last);
+    }
+  }
+  return min > max ? values.reverse() : values;
+};

frontend/node_modules/recharts/lib/util/scale/index.js

@@ -0,0 +1,18 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "getNiceTickValues", {
+  enumerable: true,
+  get: function get() {
+    return _getNiceTickValues.getNiceTickValues;
+  }
+});
+Object.defineProperty(exports, "getTickValuesFixedDomain", {
+  enumerable: true,
+  get: function get() {
+    return _getNiceTickValues.getTickValuesFixedDomain;
+  }
+});
+var _getNiceTickValues = require("./getNiceTickValues");

frontend/node_modules/recharts/lib/util/scale/util/arithmetic.js

@@ -0,0 +1,56 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.getDigitCount = getDigitCount;
+exports.rangeStep = rangeStep;
+var _decimal = _interopRequireDefault(require("decimal.js-light"));
+function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
+/**
+ * @fileOverview Some common arithmetic methods
+ * @author xile611
+ * @date 2015-09-17
+ */
+
+/**
+ * Get the digit count of a number.
+ * If the absolute value is in the interval [0.1, 1), the result is 0.
+ * If the absolute value is in the interval [0.01, 0.1), the digit count is -1.
+ * If the absolute value is in the interval [0.001, 0.01), the digit count is -2.
+ *
+ * @param  {Number} value The number
+ * @return {Integer}      Digit count
+ */
+function getDigitCount(value) {
+  var result;
+  if (value === 0) {
+    result = 1;
+  } else {
+    result = Math.floor(new _decimal.default(value).abs().log(10).toNumber()) + 1;
+  }
+  return result;
+}
+
+/**
+ * Get the data in the interval [start, end) with a fixed step.
+ * Also handles JS calculation precision issues.
+ *
+ * @param  {Decimal} start Start point
+ * @param  {Decimal} end   End point, not included
+ * @param  {Decimal} step  Step size
+ * @return {Array}         Array of numbers
+ */
+function rangeStep(start, end, step) {
+  var num = new _decimal.default(start);
+  var i = 0;
+  var result = [];
+
+  // magic number to prevent infinite loop
+  while (num.lt(end) && i < 100000) {
+    result.push(num.toNumber());
+    num = num.add(step);
+    i++;
+  }
+  return result;
+}