billboard.js/dist-esm/ChartInternal/data/convert.helper.js

Re-usable easy interface JavaScript chart library, based on D3 v4+

/*!
* Copyright (c) 2017 ~ present NAVER Corp.
 * billboard.js project is licensed under the MIT license
 * 
 * billboard.js, JavaScript chart library
 * https://naver.github.io/billboard.js/
 * 
 * @version 4.1.1
*/
import { csvParse, csvParseRows, tsvParse, tsvParseRows } from "../../module/dsv.js";
//#region src/ChartInternal/data/convert.helper.ts
/**
* Copyright (c) 2017 ~ present NAVER Corp.
* billboard.js project is licensed under the MIT license
*/
/***** Functions to be executed on Web Worker *****
* NOTE: Don't allowed to use
* - arrow function syntax
* - Utils functions
*/
/**
* Convert Columns data
* @param {object} columns
* @returns {Array}
* @private
*/
function columns(columns) {
	const newRows = [];
	columns.forEach(function(col, i) {
		const key = col[0];
		col.forEach(function(v, j) {
			if (j > 0) {
				if (typeof newRows[j - 1] === "undefined") newRows[j - 1] = {};
				if (typeof v === "undefined") throw new Error(`Source data is missing a component at (${i}, ${j})!`);
				newRows[j - 1][key] = v;
			}
		});
	});
	return newRows;
}
/**
* Convert Rows data
* @param {object} columns
* @returns {Array}
* @private
*/
function rows(rows) {
	const keys = rows[0];
	const newRows = [];
	rows.forEach(function(row, i) {
		if (i > 0) {
			const newRow = {};
			row.forEach(function(v, j) {
				if (typeof v === "undefined") throw new Error(`Source data is missing a component at (${i}, ${j})!`);
				newRow[keys[j]] = v;
			});
			newRows.push(newRow);
		}
	});
	return newRows;
}
/**
* Convert JSON data
* @param {object} columns
* @returns {Array}
* @private
*/
function json(json, keysParam) {
	const newRows = [];
	let targetKeys;
	let data;
	if (Array.isArray(json)) {
		const findValueInJson = function(object, path) {
			if (object[path] !== void 0) return object[path];
			const pathArray = path.replace(/\[(\w+)\]/g, ".$1").replace(/^\./, "").split(".");
			let target = object;
			pathArray.some(function(k) {
				return !(target = target && typeof target === "object" && k in target ? target[k] : void 0);
			});
			return target;
		};
		if (keysParam.x) targetKeys = keysParam.value.concat(keysParam.x);
		else targetKeys = keysParam.value;
		newRows.push(targetKeys);
		json.forEach(function(o) {
			const newRow = targetKeys.map(function(key) {
				let v = findValueInJson(o, key);
				if (typeof v === "undefined") v = null;
				return v;
			});
			newRows.push(newRow);
		});
		data = rows(newRows);
	} else {
		Object.keys(json).forEach(function(key) {
			const tmp = [].concat(json[key]);
			tmp.unshift?.(key);
			newRows.push(tmp);
		});
		data = columns(newRows);
	}
	return data;
}
/***** Functions can't be executed on Web Worker *****/
/**
* Convert URL data
* @param {string} url Remote URL
* @param {string} mimeType MIME type string: json | csv | tsv
* @param {object} headers Header object
* @param {object} keys Key object
* @param {function} done Callback function
* @private
*/
function url(url, mimeType = "csv", headers, keys, done) {
	const req = new XMLHttpRequest();
	const converter = {
		csv,
		tsv,
		json
	};
	req.open("GET", url);
	if (headers) Object.keys(headers).forEach(function(key) {
		req.setRequestHeader(key, headers[key]);
	});
	req.onreadystatechange = function() {
		if (req.readyState === 4) {
			if (req.status === 200) {
				const response = req.responseText;
				response && done.call(this, converter[mimeType](mimeType === "json" ? JSON.parse(response) : response, keys));
			} else throw new Error(`${url}: Something went wrong loading!`);
		}
	};
	req.send();
}
/**
* Convert CSV/TSV data
* @param {object} parser Parser object
* @param {object} xsv Data
* @returns {object}
* @private
*/
function convertCsvTsvToData(parser, xsv) {
	const rows = parser.rows(xsv);
	let d;
	if (rows.length === 1) {
		d = [{}];
		rows[0].forEach((id) => {
			d[0][id] = null;
		});
	} else d = parser.parse(xsv);
	return d;
}
function csv(xsv) {
	return convertCsvTsvToData({
		rows: csvParseRows,
		parse: csvParse
	}, xsv);
}
function tsv(tsv) {
	return convertCsvTsvToData({
		rows: tsvParseRows,
		parse: tsvParse
	}, tsv);
}
//#endregion
export { columns, csv, json, rows, tsv, url };