ct-react-stockcharts/es/lib/utils/mappedSlidingWindow.js

Highly customizable stock charts with ReactJS and d3

import noop from "./noop";
import identity from "./identity";
import { functor } from "./index";

export default function () {

	var undefinedValue = undefined,
	    windowSize = 10,
	    accumulator = noop,
	    source = identity,
	    skipInitial = 0;

	// eslint-disable-next-line prefer-const
	var mappedSlidingWindow = function mappedSlidingWindow(data) {
		var size = functor(windowSize).apply(this, arguments);
		var windowData = [];
		var accumulatorIdx = 0;
		var undef = functor(undefinedValue);
		// console.log(skipInitial, size, data.length, windowData.length);
		var result = [];
		data.forEach(function (d, i) {
			// console.log(d, i, windowData.length);
			var mapped = void 0;
			if (i < skipInitial + size - 1) {
				mapped = undef(d, i);
				result.push(mapped);
				windowData.push(mapped);
				return;
			}
			if (i >= skipInitial + size) {
				// Treat windowData as FIFO rolling buffer
				windowData.shift();
			}
			windowData.push(source(d, i));
			mapped = accumulator(windowData, i, accumulatorIdx++);
			result.push(mapped);
			windowData.pop();
			windowData.push(mapped);
			return;
		});
		return result;
	};

	mappedSlidingWindow.undefinedValue = function (x) {
		if (!arguments.length) {
			return undefinedValue;
		}
		undefinedValue = x;
		return mappedSlidingWindow;
	};
	mappedSlidingWindow.windowSize = function (x) {
		if (!arguments.length) {
			return windowSize;
		}
		windowSize = x;
		return mappedSlidingWindow;
	};
	mappedSlidingWindow.accumulator = function (x) {
		if (!arguments.length) {
			return accumulator;
		}
		accumulator = x;
		return mappedSlidingWindow;
	};
	mappedSlidingWindow.skipInitial = function (x) {
		if (!arguments.length) {
			return skipInitial;
		}
		skipInitial = x;
		return mappedSlidingWindow;
	};
	mappedSlidingWindow.source = function (x) {
		if (!arguments.length) {
			return source;
		}
		source = x;
		return mappedSlidingWindow;
	};

	return mappedSlidingWindow;
}
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