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feat: add readJson/readJsonSync for fs modules (denoland/deno_std#269)
Original: e4485d722a
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7 changed files with 148 additions and 0 deletions
42
fs/read_json.ts
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42
fs/read_json.ts
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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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import * as path from "./path/mod.ts";
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/**
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* Reads a JSON file and then parses it into an object
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* @export
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* @param {string} filePath
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* @returns {Promise<any>}
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*/
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export async function readJson(filePath: string): Promise<any> {
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filePath = path.resolve(filePath);
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const decoder = new TextDecoder("utf-8");
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const content = decoder.decode(await Deno.readFile(filePath));
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try {
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return JSON.parse(content);
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} catch (err) {
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err.message = `${filePath}: ${err.message}`;
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throw err;
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}
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}
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/**
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* Reads a JSON file and then parses it into an object
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* @export
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* @param {string} filePath
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* @returns {void}
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*/
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export function readJsonSync(filePath: string): any {
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filePath = path.resolve(filePath);
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const decoder = new TextDecoder("utf-8");
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const content = decoder.decode(Deno.readFileSync(filePath));
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try {
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return JSON.parse(content);
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} catch (err) {
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err.message = `${filePath}: ${err.message}`;
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throw err;
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}
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}
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91
fs/read_json_test.ts
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91
fs/read_json_test.ts
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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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import { test } from "../testing/mod.ts";
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import {
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assertEquals,
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assertThrowsAsync,
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assertThrows
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} from "../testing/asserts.ts";
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import { readJson, readJsonSync } from "./read_json.ts";
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import * as path from "./path/mod.ts";
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const testdataDir = path.resolve("fs", "testdata");
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test(async function readJsonFileNotExists() {
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const emptyJsonFile = path.join(testdataDir, "json_not_exists.json");
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await assertThrowsAsync(async () => {
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await readJson(emptyJsonFile);
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});
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});
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test(async function readEmptyJsonFile() {
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const emptyJsonFile = path.join(testdataDir, "json_empty.json");
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await assertThrowsAsync(async () => {
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await readJson(emptyJsonFile);
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});
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});
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test(async function readInvalidJsonFile() {
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const invalidJsonFile = path.join(testdataDir, "json_invalid.json");
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await assertThrowsAsync(async () => {
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await readJson(invalidJsonFile);
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});
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});
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test(async function readValidJsonFile() {
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const invalidJsonFile = path.join(testdataDir, "json_valid_array.json");
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const json = await readJson(invalidJsonFile);
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assertEquals(json, ["1", "2", "3"]);
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});
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test(async function readValidJsonFile() {
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const invalidJsonFile = path.join(testdataDir, "json_valid_obj.json");
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const json = await readJson(invalidJsonFile);
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assertEquals(json, { key1: "value1", key2: "value2" });
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});
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test(function readJsonFileNotExistsSync() {
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const emptyJsonFile = path.join(testdataDir, "json_not_exists.json");
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assertThrows(() => {
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readJsonSync(emptyJsonFile);
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});
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});
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test(function readEmptyJsonFileSync() {
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const emptyJsonFile = path.join(testdataDir, "json_empty.json");
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assertThrows(() => {
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readJsonSync(emptyJsonFile);
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});
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});
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test(function readInvalidJsonFile() {
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const invalidJsonFile = path.join(testdataDir, "json_invalid.json");
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assertThrows(() => {
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readJsonSync(invalidJsonFile);
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});
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});
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test(function readValidJsonFile() {
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const invalidJsonFile = path.join(testdataDir, "json_valid_array.json");
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const json = readJsonSync(invalidJsonFile);
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assertEquals(json, ["1", "2", "3"]);
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});
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test(function readValidJsonFile() {
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const invalidJsonFile = path.join(testdataDir, "json_valid_obj.json");
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const json = readJsonSync(invalidJsonFile);
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assertEquals(json, { key1: "value1", key2: "value2" });
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});
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0
fs/testdata/json_empty.json
vendored
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0
fs/testdata/json_empty.json
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5
fs/testdata/json_invalid.json
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5
fs/testdata/json_invalid.json
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{
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[
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"here is a invalid json file"
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]
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}
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5
fs/testdata/json_valid_array.json
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5
fs/testdata/json_valid_array.json
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[
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"1",
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"2",
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"3"
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]
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4
fs/testdata/json_valid_obj.json
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4
fs/testdata/json_valid_obj.json
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{
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"key1": "value1",
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"key2": "value2"
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}
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1
test.ts
1
test.ts
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import "./fs/ensure_dir_test.ts";
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import "./fs/ensure_file_test.ts";
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import "./fs/move_test.ts";
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import "./fs/read_json_test.ts";
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import "./io/test.ts";
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import "./http/server_test.ts";
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import "./http/file_server_test.ts";
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