From d44ebeda043010c17c7099ab431d7238521adf93 Mon Sep 17 00:00:00 2001 From: Apoorv Date: Sun, 31 Mar 2024 01:21:18 +0530 Subject: [PATCH] Initial commit --- .editorconfig | 8 + .eslintrc.json | 3 + .github/workflows/ci.yml | 37 + .github/workflows/release.yml | 22 + .gitignore | 2 + .prettierrc.js | 3 + LICENSE | 21 + README.md | 39 + build.mjs | 8 + package-lock.json | 2814 +++++++++++++++++++++++++++++++++ package.json | 47 + src/index.ts | 292 ++++ tsconfig.json | 16 + 13 files changed, 3312 insertions(+) create mode 100644 .editorconfig create mode 100644 .eslintrc.json create mode 100644 .github/workflows/ci.yml create mode 100644 .github/workflows/release.yml create mode 100644 .gitignore create mode 100644 .prettierrc.js create mode 100644 LICENSE create mode 100644 README.md create mode 100644 build.mjs create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 src/index.ts create mode 100644 tsconfig.json diff --git a/.editorconfig b/.editorconfig new file mode 100644 index 0000000..79fe802 --- /dev/null +++ b/.editorconfig @@ -0,0 +1,8 @@ +root = true + +[*] +indent_style = space +indent_size = 2 +end_of_line = lf +charset = utf-8 +insert_final_newline = true diff --git a/.eslintrc.json b/.eslintrc.json new file mode 100644 index 0000000..f95bb33 --- /dev/null +++ b/.eslintrc.json @@ -0,0 +1,3 @@ +{ + "extends": "./node_modules/gts/" +} diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml new file mode 100644 index 0000000..49a420b --- /dev/null +++ b/.github/workflows/ci.yml @@ -0,0 +1,37 @@ +name: CI + +on: + push: + branches: + - main + + pull_request: + branches: + - main + +jobs: + test: + runs-on: ${{ matrix.os }} + + strategy: + matrix: + os: [ubuntu-latest, macos-latest] + fail-fast: false + + steps: + - id: checkout + name: Checkout + uses: actions/checkout@v3 + - id: setup-bun + name: Setup Bun + uses: oven-sh/setup-bun@v1 + with: + bun-version: latest + - id: install-deps + name: Install dependencies + run: | + bun install + - id: test + name: Run test + run: | + bun test diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml new file mode 100644 index 0000000..216ba3b --- /dev/null +++ b/.github/workflows/release.yml @@ -0,0 +1,22 @@ +name: Release + +on: + push: + tags: + - 'v*' + +jobs: + release: + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v3 + with: + fetch-depth: 0 + + - uses: actions/setup-node@v3 + with: + node-version: 16.x + + - run: npx changelogithub + env: + GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}} diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..f06235c --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +node_modules +dist diff --git a/.prettierrc.js b/.prettierrc.js new file mode 100644 index 0000000..ff15483 --- /dev/null +++ b/.prettierrc.js @@ -0,0 +1,3 @@ +module.exports = { + ...require('gts/.prettierrc.json') +} diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..e9a1616 --- /dev/null +++ b/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2024 Kakashi + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/README.md b/README.md new file mode 100644 index 0000000..239a1f2 --- /dev/null +++ b/README.md @@ -0,0 +1,39 @@ +A streaming JSON parser for Node.js that works with [superqueue](https://github.com/libkakashi/superqueue). This parser is designed to work with streaming JSON data, such as live generating JSON by an LLM where you want to display it in real-time as it's being generated. + +Note: This is not meant to work with files that are too large to fit in memory. + +### Installation + +```bash +// yarn +yarn add superqueue@https://github.com/libkakashi/json-stream + +// npm +npm i https://github.com/libkakashi/json-stream +``` + +### Example Usage + +```tsx +import Queue from 'superqueue'; // https://github.com/libkakashi/superqueue +import JsonParser, {resolveStreamResult} from 'json-stream'; + +const queue = new Queue(); +const parser = new JsonParser(queue); +const jsonStream = parser.parseValue(); + +const res = await axios.get('streaming-json-endpoint', { + responseType: 'stream', +}); +const stream = res.data; + +stream.on('data', chunk => { + queue.push(...chunk); // push character by character, very important + + // obj gets name and description properties dynamically populated as more chunks are received. Make sure to keep every property optional since you never know when they'll be populated. + const obj = await resolveStreamResult<{name?: string; description?: string}>( + jsonStream + ); +}); +stream.on('end', () => queue.end()); +``` diff --git a/build.mjs b/build.mjs new file mode 100644 index 0000000..dd6ef5f --- /dev/null +++ b/build.mjs @@ -0,0 +1,8 @@ +import dts from 'bun-plugin-dts' + +await Bun.build({ + entrypoints: ['./src/index.ts'], + outdir: './dist', + minify: true, + plugins: [dts()] +}) diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..7e2b947 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,2814 @@ +{ + "name": "json-stream", + "version": "0.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "json-stream", + "version": "0.0.0", + "license": "MIT", + "dependencies": { + "superqueue": "github:libkakashi/superqueue" + }, + "devDependencies": { + "@types/bun": "^1.0.0", + "@types/node": "20.11.5", + 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esnext --outDir dist/esm && mv dist/esm/index.js dist/index.mjs && rm -rf dist/esm", + "build:bun": "bun run build.mjs", + "prepack": "npm run build", + "lint": "gts lint", + "clean": "gts clean", + "fix": "gts fix" + }, + "license": "MIT", + "homepage": "https://github.com/libkakashi/json-stream#readme", + "repository": { + "type": "git", + "url": "git+https://github.com/libkakashi/json-stream.git" + }, + "bugs": "https://github.com/libkakashi/json-stream/issues", + "author": "Kakashi =12.9.0" + }, + "dependencies": { + "superqueue": "github:libkakashi/superqueue" + } +} diff --git a/src/index.ts b/src/index.ts new file mode 100644 index 0000000..9062268 --- /dev/null +++ b/src/index.ts @@ -0,0 +1,292 @@ +import Queue from "superqueue"; + +type JSONStreamValue = + | null + | number + | boolean + | string + | JSONArrayStream + | JSONObjectStream; + +export type JSONStreamResult = { + data: T; + wait: Promise; +}; + +interface JSONObjectStream { + [key: string]: JSONStreamResult; +} + +type JSONArrayStream = Array>; + +const assert = (condition: boolean, message = "Assertion failed") => { + if (!condition) throw new Error(message); +}; + +const assertEq = (a: unknown, b: unknown, message = "Assertion failed") => { + if (a !== b) throw new Error(`${message}: '${a}' !== '${b}'`); +}; + +const numbers = "0123456789"; + +type UpdaterFunction = (oldData: T) => T; +type DeepUpdaterFunction = (oldData: T) => void; +type UpdateData = T | UpdaterFunction; + +class JsonParser { + queue: Queue; + last = ""; + + constructor(queue: Queue) { + this.queue = queue; + } + + #isWhitespace(char: string): boolean { + return char === " " || char === "\n" || char === "\t" || char === "\r"; + } + + async #next(len = 1): Promise { + let str = ""; + + for (let i = 0; i < len; i++) { + const char = await this.queue.shiftUnsafe(); + if (char === Queue.EOF) return undefined; + str += char; + } + this.last = str.charAt(str.length - 1); + return str; + } + + async #nextNonEof(len?: number): Promise { + const chunk = await this.#next(len); + assert(chunk !== undefined, "Unexpected end of JSON input."); + return chunk!; + } + + async #skipWhiteSpaces(): Promise { + for ( + let char = await this.#nextNonEof(); + ; + char = await this.#nextNonEof() + ) { + if (!this.#isWhitespace(char)) return char; + } + } + + async #expectNext(expected: string): Promise { + const char = await this.#nextNonEof(expected.length); + assertEq(char, expected, `Expected '${expected}' got '${char} '`); + return char; + } + + #wrapResult( + initialData: T, + callback: (update: { + (data: UpdateData | UpdaterFunction, deep?: false): void; + (data: DeepUpdaterFunction, deep: true): void; + }) => Promise, + ): JSONStreamResult { + const update = ( + data: UpdateData | UpdaterFunction | DeepUpdaterFunction, + deep = false, + ) => { + if (deep) { + if (!(data instanceof Function)) { + throw new Error("Data must be a function when using deep: true"); + } + const newData = data(result.data); + + if (newData) { + throw new Error( + "Update data must be undefined when using deep: true", + ); + } + return; + } else { + const newData = data instanceof Function ? data(result.data) : data; + + if (!newData) { + throw new Error("Update data cannot be undefined"); + } + result.data = newData; + } + }; + const result: JSONStreamResult = { + data: initialData, + wait: callback(update).then(() => result.data), + }; + return result; + } + + async parseValue(skip = true) { + if (skip) await this.#skipWhiteSpaces(); + + switch (this.last) { + case "{": + return this.parseObject(); + case "[": + return this.parseArray(); + case '"': + return this.parseString(); + case "t": + return this.parseBoolean(true); + case "f": + return this.parseBoolean(false); + case "n": + return this.parseNull(); + case "0": + case "1": + case "2": + case "3": + case "4": + case "5": + case "6": + case "7": + case "8": + case "9": + return this.parseNumber(); + default: + throw new Error(`Unexpected token ${this.last} in JSON`); + } + } + + parseObject() { + return this.#wrapResult({}, async (update) => { + // eslint-disable-next-line no-constant-condition + while (true) { + await this.#skipWhiteSpaces(); + if (this.last === "}") break; + + const key = this.parseString(); + await key.wait; + + assertEq(await this.#skipWhiteSpaces(), ":"); + + const val = await this.parseValue(); + update((data) => void (data[key.data] = val), true); + + await val.wait; + + if (typeof val!.data !== "number" || this.#isWhitespace(this.last)) { + await this.#skipWhiteSpaces(); + } + if (this.last === "}") break; + if (this.last !== ",") { + throw new Error(`Unexpected token ${this.last} in JSON`); + } + } + }); + } + + parseArray() { + return this.#wrapResult([], async (update) => { + // eslint-disable-next-line no-constant-condition + while (true) { + await this.#skipWhiteSpaces(); + if (this.last === "]") break; + + const val = await this.parseValue(false); + update((data) => void data.push(val), true); + + await val.wait; + + if (typeof val.data !== "number" || this.#isWhitespace(this.last)) { + await this.#skipWhiteSpaces(); + } + if (this.last === "]") break; + if (this.last !== ",") + throw new Error(`Unexpected token ${this.last} in JSON`); + } + }); + } + + parseNumber() { + return this.#wrapResult(parseInt(this.last), async (update) => { + for (let char = await this.#next(); ; char = await this.#next()) { + if (!char || !(numbers.includes(char) && char !== ".")) { + break; + } + update((num) => parseFloat(num.toString() + char)); + } + }); + } + + parseString() { + return this.#wrapResult("", async (update) => { + for ( + let char = await this.#nextNonEof(); + char !== '"'; + char = await this.#nextNonEof() + ) { + if (char !== "\\") { + update((str) => str + char); + continue; + } + const nextChar = await this.#nextNonEof(); + + const escapeSequences: Record = { + '"': '"', + "\\": "\\", + "/": "/", + b: "\b", + f: "\f", + n: "\n", + r: "\r", + t: "\t", + }; + if (escapeSequences[nextChar]) { + update((str) => str + escapeSequences[nextChar]); + continue; + } + if (nextChar === "u") { + const char = parseInt(await this.#nextNonEof(4), 16); + update((str) => str + String.fromCharCode(char)); + } else if (nextChar === "U") { + const char = parseInt(await this.#nextNonEof(8), 16); + update((str) => str + String.fromCharCode(char)); + } + throw new Error(`Invalid escape sequence ${nextChar} in JSON`); + } + }); + } + + parseBoolean(expected: boolean) { + return this.#wrapResult(expected, () => + this.#expectNext(expected ? "rue" : "alse"), + ); + } + + parseNull() { + return this.#wrapResult(null, () => this.#expectNext("ull")); + } +} + +const resolveStreamResultSync = ( + stream: JSONStreamResult, +): T => { + switch (typeof stream.data) { + case "object": + if (Array.isArray(stream.data)) { + return stream.data.map(resolveStreamResultSync) as T extends Array + ? T + : never; + } else { + const result: any = {}; + for (const key in stream.data) { + result[key] = resolveStreamResultSync(stream.data[key]!); + } + return result as T; + } + default: + return stream.data as T extends number | string | boolean ? T : never; + } +}; + +export const resolveStreamResult = async ( + stream: + | JSONStreamResult + | Promise>, +): Promise => + resolveStreamResultSync(stream instanceof Promise ? await stream : stream); + +export default JsonParser; diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 0000000..b7cd75b --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,16 @@ +{ + "compilerOptions": { + "target": "es2020", + "module": "esnext", + "strict": true, + "esModuleInterop": true, + "moduleResolution": "node", + "skipLibCheck": true, + "noUnusedLocals": true, + "noImplicitAny": true, + "allowJs": true, + "noEmit": true, + "outDir": "dist", + "resolveJsonModule": true + } +}