datakit
Version:
Simple JavaScript toolkit for data transform across JSON, CSV and YAML.
320 lines • 13.3 kB
JavaScript
"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
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 (g && (g = 0, op[0] && (_ = 0)), _) 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:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.outputData = exports.outputDataToFile = exports.outputDataToStdout = exports.writeStdout = exports.inputData = exports.inputDataFromStdin = exports.readStdin = void 0;
var readline = __importStar(require("readline"));
var __1 = require("..");
var __2 = require("..");
var __3 = require("..");
var __4 = require("..");
var utils_1 = require("./utils");
//
// Reads data from standard input.
//
function readStdin() {
return new Promise(function (resolve, reject) {
var rl = readline.createInterface({
input: process.stdin,
});
var input = "";
var timeout = undefined;
var timedout = false;
//
// Cancels the timeout, if it's still in progress.
//
function cancelTimeout() {
if (timeout) {
clearTimeout(timeout);
timeout = undefined;
}
}
//
// Starts a new timeout (cancelling any previous timeout).
//
function startTimeout() {
cancelTimeout();
timeout = setTimeout(function () {
timedout = true;
reject(new Error("Timed out with no input on standard input. Use argument --help to get help about this command."));
}, 1000 * 30);
}
;
rl.on("line", function (line) {
if (timedout) {
return;
}
input += line + '\n';
startTimeout();
});
rl.on("close", function () {
if (timedout) {
return;
}
cancelTimeout();
resolve(input);
});
startTimeout();
});
}
exports.readStdin = readStdin;
//
// Reads data from standard input in the requested format.
// Data format defaults to JSON if none is specified.
//
function inputDataFromStdin(expectedFormat) {
return __awaiter(this, void 0, void 0, function () {
var input;
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, readStdin()];
case 1:
input = _a.sent();
if (expectedFormat === undefined || expectedFormat === "json") {
return [2 /*return*/, JSON.parse(input)];
}
else if (expectedFormat == "csv") {
return [2 /*return*/, (0, __1.fromCsv)(input)];
}
else if (expectedFormat === "yaml") {
return [2 /*return*/, (0, __1.fromYaml)(input)];
}
else {
throw new Error("Unexpected data format: ".concat(expectedFormat));
}
return [2 /*return*/];
}
});
});
}
exports.inputDataFromStdin = inputDataFromStdin;
//
// Input data from a data file or standard input.
//
function inputData(argv, expectedFormat) {
return __awaiter(this, void 0, void 0, function () {
var fileName;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (!(argv.length === 0)) return [3 /*break*/, 2];
return [4 /*yield*/, inputDataFromStdin(expectedFormat)];
case 1:
//
// Default to reading JSON data from standard input.
//
return [2 /*return*/, _a.sent()];
case 2:
fileName = argv.shift().toLowerCase();
if (!(fileName === "-")) return [3 /*break*/, 4];
return [4 /*yield*/, inputDataFromStdin(expectedFormat)];
case 3:
//
// Explicitly read JSON data from standard input.
//
return [2 /*return*/, _a.sent()];
case 4:
if (expectedFormat === undefined) {
//
// Choose data format from the file extension.
//
expectedFormat = determineFormat(fileName);
}
if (!(expectedFormat === "json")) return [3 /*break*/, 6];
return [4 /*yield*/, (0, __2.readJson)(fileName)];
case 5: return [2 /*return*/, _a.sent()];
case 6:
if (!(expectedFormat === "csv")) return [3 /*break*/, 8];
return [4 /*yield*/, (0, __3.readCsv)(fileName)];
case 7: return [2 /*return*/, _a.sent()];
case 8:
if (!(expectedFormat === "yaml")) return [3 /*break*/, 10];
return [4 /*yield*/, (0, __4.readYaml)(fileName)];
case 9: return [2 /*return*/, _a.sent()];
case 10: throw new Error("Unexpected data format: ".concat(expectedFormat));
}
});
});
}
exports.inputData = inputData;
//
// Figure out the data format from the file name.
//
function determineFormat(fileName) {
if (fileName.endsWith(".json")) {
return "json";
}
else if (fileName.endsWith(".csv")) {
return "csv";
}
else if (fileName.endsWith(".yaml")) {
return "yaml";
}
else if (fileName.endsWith(".yml")) {
return "yaml";
}
else {
throw new Error("Failed to identify data format from file name: \"".concat(fileName, "\""));
}
}
//
// Writes text to standard output.
//
function writeStdout(data) {
process.stdout.write(data);
}
exports.writeStdout = writeStdout;
//
// Write data to standard output in the requested format.
// Data format defaults to JSON if none is specified.
//
function outputDataToStdout(data, expectedFormat, config) {
var formattedData;
if (expectedFormat === undefined || expectedFormat === "json") {
formattedData = JSON.stringify(data, null, 4);
}
else if (expectedFormat == "csv") {
if (!(0, utils_1.isArray)(data)) {
throw new Error("To write csv to standard output, expect the data to be an array of records. Instead got \"".concat(typeof data, "\"."));
}
formattedData = (0, __1.toCsv)(data, config);
}
else if (expectedFormat === "yaml") {
formattedData = (0, __1.toYaml)(data);
}
else {
throw new Error("Unexpected data format: ".concat(expectedFormat));
}
writeStdout(formattedData);
}
exports.outputDataToStdout = outputDataToStdout;
//
// Outputs data to a name file.
//
function outputDataToFile(data, fileName, expectedFormat, config) {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (expectedFormat === undefined) {
//
// Choose data format from the file extension.
//
expectedFormat = determineFormat(fileName);
}
if (!(expectedFormat === "json")) return [3 /*break*/, 2];
return [4 /*yield*/, (0, __1.writeJson)(fileName, data)];
case 1:
_a.sent();
return [3 /*break*/, 7];
case 2:
if (!(expectedFormat === "csv")) return [3 /*break*/, 4];
if (!(0, utils_1.isArray)(data)) {
throw new Error("To write csv file ".concat(fileName, ", expect the data to be an array of records. Instead got \"").concat(typeof data, "\"."));
}
return [4 /*yield*/, (0, __1.writeCsv)(fileName, data, config)];
case 3:
_a.sent();
return [3 /*break*/, 7];
case 4:
if (!(expectedFormat === "yaml")) return [3 /*break*/, 6];
return [4 /*yield*/, (0, __1.writeYaml)(fileName, data)];
case 5: return [2 /*return*/, _a.sent()];
case 6: throw new Error("Unexpected data format: ".concat(expectedFormat));
case 7: return [2 /*return*/];
}
});
});
}
exports.outputDataToFile = outputDataToFile;
//
// Outputs data as JSON to a file or to standard output.
//
function outputData(argv, data, expectedFormat, config) {
return __awaiter(this, void 0, void 0, function () {
var fileName;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (!(argv.length === 0)) return [3 /*break*/, 1];
//
// Default is to output to stdout.
//
outputDataToStdout(data, expectedFormat, config);
return [3 /*break*/, 4];
case 1:
fileName = argv.shift().toLowerCase();
if (!(fileName === "-")) return [3 /*break*/, 2];
//
// Explicitly output to stdout.
//
outputDataToStdout(data, expectedFormat, config);
return [3 /*break*/, 4];
case 2: return [4 /*yield*/, outputDataToFile(data, fileName, expectedFormat, config)];
case 3:
_a.sent();
_a.label = 4;
case 4: return [2 /*return*/];
}
});
});
}
exports.outputData = outputData;
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