danfojs
Version:
JavaScript library providing high performance, intuitive, and easy to use data structures for manipulating and processing structured data.
214 lines (213 loc) • 8.82 kB
JavaScript
;
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
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}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.$toJSON = exports.$readJSON = void 0;
var __1 = require("../../");
/**
* Reads a JSON file from local or remote location into a DataFrame.
* @param fileName URL or local file path to JSON file.
* @param options Configuration object. Supported options:
* - `method`: The HTTP method to use. Defaults to `'GET'`.
* - `headers`: Additional headers to send with the request. Supports the `node-fetch` [HeadersInit]
* @example
* ```
* import { readJSON } from "danfojs-node"
* const df = await readJSON("https://raw.githubusercontent.com/test.json")
* ```
* @example
* ```
* import { readJSON } from "danfojs-node"
* const df = await readJSON("https://raw.githubusercontent.com/test.json", {
* headers: {
* Accept: "text/json",
* Authorization: "Bearer YWRtaW46YWRtaW4="
* }
* })
* ```
* @example
* ```
* import { readJSON } from "danfojs-node"
* const df = await readJSON("./data/sample.json")
* ```
*/
var $readJSON = function (file, options) { return __awaiter(void 0, void 0, void 0, function () {
var _a, method, headers, frameConfig;
return __generator(this, function (_b) {
_a = __assign({ method: "GET", headers: {}, frameConfig: {} }, options), method = _a.method, headers = _a.headers, frameConfig = _a.frameConfig;
if (typeof file === "string" && file.startsWith("http")) {
return [2 /*return*/, new Promise(function (resolve) {
fetch(file, { method: method, headers: headers }).then(function (response) {
if (response.status !== 200) {
throw new Error("Failed to load " + file);
}
response.json().then(function (json) {
resolve(new __1.DataFrame(json, frameConfig));
});
}).catch(function (err) {
throw new Error(err);
});
})];
}
else if (file instanceof File) {
return [2 /*return*/, new Promise(function (resolve) {
var reader = new FileReader();
reader.readAsText(file);
reader.onload = function (event) {
var _a;
var jsonObj = JSON.parse((_a = event === null || event === void 0 ? void 0 : event.target) === null || _a === void 0 ? void 0 : _a.result);
resolve(new __1.DataFrame(jsonObj, frameConfig));
};
})];
}
else {
throw new Error("ParamError: File not supported. file must be a url or an input File object");
}
return [2 /*return*/];
});
}); };
exports.$readJSON = $readJSON;
/**
* Converts a DataFrame or Series to JSON.
* @param df DataFrame or Series to be converted to JSON.
* @param options Configuration object. Supported options:
* - `fileName`: The file path to write the JSON to. If not specified, the JSON object is returned.
* - `format`: The format of the JSON. Defaults to `'column'`. E.g for using `column` format:
* ```
* [{ "a": 1, "b": 2, "c": 3, "d": 4 },
* { "a": 5, "b": 6, "c": 7, "d": 8 }]
* ```
* and `row` format:
* ```
* { "a": [1, 5, 9],
* "b": [2, 6, 10]
* }
* ```
* @example
* ```
* import { toJSON } from "danfojs-node"
* const df = new DataFrame([[1, 2, 3], [4, 5, 6]])
* const json = toJSON(df)
* ```
* @example
* ```
* import { toJSON } from "danfojs-node"
* const df = new DataFrame([[1, 2, 3], [4, 5, 6]])
* toJSON(df, {
* fileName: "./data/sample.json",
* format: "row"
* })
* ```
*/
var $toJSON = function (df, options) {
var _a = __assign({ fileName: "output.json", download: false, format: "column" }, options), fileName = _a.fileName, format = _a.format, download = _a.download;
if (df.$isSeries) {
var obj = {};
obj[df.columns[0]] = df.values;
if (download) {
if (!fileName.endsWith(".json")) {
fileName = fileName + ".json";
}
$downloadFileInBrowser(obj, fileName);
}
else {
return obj;
}
}
else {
if (format === "row") {
var obj = {};
for (var i = 0; i < df.columns.length; i++) {
obj[df.columns[i]] = df.column(df.columns[i]).values;
}
if (download) {
if (!(fileName.endsWith(".json"))) {
fileName = fileName + ".json";
}
$downloadFileInBrowser(obj, fileName);
}
else {
return obj;
}
}
else {
var values = df.values;
var header_1 = df.columns;
var jsonArr_1 = [];
values.forEach(function (val) {
var obj = {};
header_1.forEach(function (h, i) {
obj[h] = val[i];
});
jsonArr_1.push(obj);
});
if (download) {
if (!fileName.endsWith(".json")) {
fileName = fileName + ".json";
}
$downloadFileInBrowser(jsonArr_1, fileName);
}
else {
return jsonArr_1;
}
}
}
};
exports.$toJSON = $toJSON;
/**
* Internal function to download a JSON file in the browser.
* @param content A string of JSON file contents
* @param fileName The name of the file to be downloaded
*/
var $downloadFileInBrowser = function (content, fileName) {
var hiddenElement = document.createElement('a');
hiddenElement.href = 'data:text/json;charset=utf-8,' + encodeURIComponent(JSON.stringify(content));
hiddenElement.target = '_blank';
hiddenElement.download = fileName;
hiddenElement.click();
};