@sunrise1002/tats/lib/candlestick/CandlestickFinder.js

Techincal Indicators written in javascript

export default class CandlestickFinder {
    constructor() {
        // if (new.target === Abstract) {
        //     throw new TypeError("Abstract class");
        // }
    }
    approximateEqual(a, b) {
        let left = parseFloat(Math.abs(a - b).toPrecision(4)) * 1;
        let right = parseFloat((a * 0.001).toPrecision(4)) * 1;
        return left <= right;
    }
    logic(data) {
        throw "this has to be implemented";
    }
    getAllPatternIndex(data) {
        if (data.close.length < this.requiredCount) {
            console.warn('Data count less than data required for the strategy ', this.name);
            return [];
        }
        if (data.reversedInput) {
            data.open.reverse();
            data.high.reverse();
            data.low.reverse();
            data.close.reverse();
        }
        let strategyFn = this.logic;
        return this._generateDataForCandleStick(data)
            .map((current, index) => {
            return strategyFn.call(this, current) ? index : undefined;
        }).filter((hasIndex) => {
            return hasIndex;
        });
    }
    hasPattern(data, restParams) {
        if (data.close.length < this.requiredCount) {
            console.warn('Data count less than data required for the strategy ', this.name);
            return false;
        }
        if (data.reversedInput) {
            data.open.reverse();
            data.high.reverse();
            data.low.reverse();
            data.close.reverse();
        }
        let strategyFn = this.logic;
        return strategyFn.call(this, this._getLastDataForCandleStick(data), restParams);
    }
    _getLastDataForCandleStick(data) {
        let requiredCount = this.requiredCount;
        if (data.close.length === requiredCount) {
            return data;
        }
        else {
            let returnVal = {
                open: [],
                high: [],
                low: [],
                close: []
            };
            let i = 0;
            let index = data.close.length - requiredCount;
            while (i < requiredCount) {
                returnVal.open.push(data.open[index + i]);
                returnVal.high.push(data.high[index + i]);
                returnVal.low.push(data.low[index + i]);
                returnVal.close.push(data.close[index + i]);
                i++;
            }
            return returnVal;
        }
    }
    _generateDataForCandleStick(data) {
        let requiredCount = this.requiredCount;
        let generatedData = data.close.map(function (currentData, index) {
            let i = 0;
            let returnVal = {
                open: [],
                high: [],
                low: [],
                close: []
            };
            while (i < requiredCount) {
                returnVal.open.push(data.open[index + i]);
                returnVal.high.push(data.high[index + i]);
                returnVal.low.push(data.low[index + i]);
                returnVal.close.push(data.close[index + i]);
                i++;
            }
            return returnVal;
        }).filter((val, index) => { return (index <= (data.close.length - requiredCount)); });
        return generatedData;
    }
}